Brotli Compressed Data Format
draft-alakuijala-brotli-04
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Document | Type |
This is an older version of an Internet-Draft that was ultimately published as RFC 7932.
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Authors | Jyrki Alakuijala , Zoltan Szabadka | ||
Last updated | 2015-05-11 | ||
RFC stream | Independent Submission | ||
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Stream | ISE state | In ISE Review | |
Consensus boilerplate | Unknown | ||
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IESG | IESG state | Became RFC 7932 (Informational) | |
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draft-alakuijala-brotli-04
Network Working Group J. Alakuijala Internet-Draft Z. Szabadka Intended Status: Informational Google, Inc Expires: November 11, 2015 May 2015 Brotli Compressed Data Format draft-alakuijala-brotli-04 Abstract This specification defines a lossless compressed data format that compresses data using a combination of the LZ77 algorithm and Huffman coding, with efficiency comparable to the best currently available general-purpose compression methods. Status of this Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on November 11, 2015. Copyright Notice Copyright (c) 2015 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Alakuijala & Szabadka Expires November 11, 2015 [Page 1] Internet-Draft Brotli May 2015 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1. Purpose . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2. Intended audience . . . . . . . . . . . . . . . . . . . . 3 1.3. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.4. Compliance . . . . . . . . . . . . . . . . . . . . . . . . 4 1.5. Definitions of terms and conventions used . . . . . . . . 4 1.5.1. Packing into bytes . . . . . . . . . . . . . . . . . 4 2. Compressed representation overview . . . . . . . . . . . . . . 5 3. Compressed representation of prefix codes . . . . . . . . . . . 9 3.1. Introduction to prefix coding . . . . . . . . . . . . . . 9 3.2. Use of prefix coding in the brotli format . . . . . . . . 10 3.3. Alphabet sizes . . . . . . . . . . . . . . . . . . . . . 12 3.4. Simple prefix codes . . . . . . . . . . . . . . . . . . . 12 3.5. Complex prefix codes . . . . . . . . . . . . . . . . . . 13 4. Encoding of distances . . . . . . . . . . . . . . . . . . . . 15 5. Encoding of literal insertion lengths and copy lengths . . . . 17 6. Encoding of block switch commands . . . . . . . . . . . . . . 19 7. Context modeling . . . . . . . . . . . . . . . . . . . . . . . 21 7.1. Context modes and context ID lookup for literals . . . . 21 7.2. Context ID for distances . . . . . . . . . . . . . . . . 23 7.3. Encoding of the context map . . . . . . . . . . . . . . . 23 8. Static dictionary . . . . . . . . . . . . . . . . . . . . . . 25 9. Compressed data format . . . . . . . . . . . . . . . . . . . . 27 9.1. Format of the stream header . . . . . . . . . . . . . . . 27 9.2. Format of the meta-block header . . . . . . . . . . . . . 28 9.3. Format of the meta-block data . . . . . . . . . . . . . . 30 10. Decoding algorithm . . . . . . . . . . . . . . . . . . . . . 31 11. Security Considerations . . . . . . . . . . . . . . . . . . . 33 12. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 34 13. Informative References . . . . . . . . . . . . . . . . . . . 34 14. Source code . . . . . . . . . . . . . . . . . . . . . . . . . 34 15. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 34 Appendix A. Static dictionary data . . . . . . . . . . . . . . . 34 Appendix B. List of word transformations . . . . . . . . . . . . 115 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 118 Alakuijala & Szabadka Expires November 11, 2015 [Page 2] Internet-Draft Brotli May 2015 1. Introduction 1.1. Purpose The purpose of this specification is to define a lossless compressed data format that: * Is independent of CPU type, operating system, file system, and character set, and hence can be used for interchange; * Can be produced or consumed, even for an arbitrarily long sequentially presented input data stream, using only an a priori bounded amount of intermediate storage, and hence can be used in data communications or similar structures, such as Unix filters; * Compresses data with a compression ratio comparable to the best currently available general-purpose compression methods, and in particular considerably better than the gzip program; * Decompresses much faster than current LZMA implementations. The data format defined by this specification does not attempt to: * Allow random access to compressed data; * Compress specialized data (e.g., raster graphics) as well as the best currently available specialized algorithms. 1.2. Intended audience This specification is intended for use by software implementers to compress data into and/or decompress data from the brotli format. The text of the specification assumes a basic background in programming at the level of bits and other primitive data representations. Familiarity with the technique of Huffman coding is helpful but not required. This specification uses heavily the notations and terminology introduced in the DEFLATE format specification [RFC 1951]. For the sake of completeness, we always include the whole text of the relevant parts of RFC 1951, therefore familiarity with the DEFLATE format is helpful but not required. The compressed data format defined in this specification is an integral part of the WOFF 2.0 web font file format [WOFF2], therefore this specification is also intended for implementers of WOFF 2.0 compressors and decompressors. 1.3. Scope The specification specifies a method for representing a sequence of bytes as a (usually shorter) sequence of bits, and a method for Alakuijala & Szabadka Expires November 11, 2015 [Page 3] Internet-Draft Brotli May 2015 packing the latter bit sequence into bytes. 1.4. Compliance Unless otherwise indicated below, a compliant decompressor must be able to accept and decompress any data set that conforms to all the specifications presented here. A compliant compressor must produce data sets that conform to all the specifications presented here. 1.5. Definitions of terms and conventions used Byte: 8 bits stored or transmitted as a unit (same as an octet). For this specification, a byte is exactly 8 bits, even on machines which store a character on a number of bits different from eight. See below for the numbering of bits within a byte. String: a sequence of arbitrary bytes. Bytes stored within a computer do not have a "bit order", since they are always treated as a unit. However, a byte considered as an integer between 0 and 255 does have a most- and least- significant bit, and since we write numbers with the most- significant digit on the left, we also write bytes with the most- significant bit on the left. In the diagrams below, we number the bits of a byte so that bit 0 is the least-significant bit, i.e., the bits are numbered: +--------+ |76543210| +--------+ Within a computer, a number may occupy multiple bytes. All multi-byte numbers in the format described here are stored with the least- significant byte first (at the lower memory address). For example, the decimal number 520 is stored as: 0 1 +--------+--------+ |00001000|00000010| +--------+--------+ ^ ^ | | | + more significant byte = 2 x 256 + less significant byte = 8 1.5.1. Packing into bytes This document does not address the issue of the order in which bits of a byte are transmitted on a bit-sequential medium, since the final Alakuijala & Szabadka Expires November 11, 2015 [Page 4] Internet-Draft Brotli May 2015 data format described here is byte- rather than bit-oriented. However, we describe the compressed block format below as a sequence of data elements of various bit lengths, not a sequence of bytes. We must therefore specify how to pack these data elements into bytes to form the final compressed byte sequence: * Data elements are packed into bytes in order of increasing bit number within the byte, i.e., starting with the least-significant bit of the byte. * Data elements other than prefix codes are packed starting with the least-significant bit of the data element. These are referred to here as integer values and are considered unsigned. * Prefix codes are packed starting with the most- significant bit of the code. In other words, if one were to print out the compressed data as a sequence of bytes, starting with the first byte at the *right* margin and proceeding to the *left*, with the most- significant bit of each byte on the left as usual, one would be able to parse the result from right to left, with fixed-width elements in the correct MSB-to-LSB order and prefix codes in bit-reversed order (i.e., with the first bit of the code in the relative LSB position). 2. Compressed representation overview A compressed data set consists of a header and a series of meta- blocks. Each meta-block decompresses to a sequence of 1 to 16,777,216 (16 MiB) uncompressed bytes. The final uncompressed data is the concatenation of the uncompressed sequences from each meta-block. The header contains the size of the sliding window that was used during compression. The decompressor must retain at least that amount of uncompressed data prior to the current position in the stream, in order to be able to decompress what follows. The sliding window size is a power of two, minus 16, where the power is in the range of 16 to 24. The possible sliding window sizes range from 64 KiB - 16 B to 16 MiB - 16 B. Each meta-block is compressed using a combination of the LZ77 algorithm (Lempel-Ziv 1977, [LZ77]) and Huffman coding. The result of Huffman coding is referred to here as a prefix code. The prefix codes for each meta-block are independent of those for previous or subsequent meta-blocks; the LZ77 algorithm may use a reference to a duplicated string occurring in a previous meta-block, up to the sliding window size of uncompressed bytes before. In addition, in the brotli format, a string reference may instead refer to a static dictionary entry. Alakuijala & Szabadka Expires November 11, 2015 [Page 5] Internet-Draft Brotli May 2015 Each meta-block consists of two parts: a meta-block header that describes the representation of the compressed data part, and a compressed data part. The compressed data consists of a series of commands. Each command consists of two parts: a sequence of literal bytes (of strings that have not been detected as duplicated within the sliding window), and a pointer to a duplicated string, represented as a pair <length, backward distance>. There can be zero literal bytes in the command. The minimum length of the string to be duplicated is two, but the last command in the meta-block is permitted to have only literals and no pointer to a string to duplicate. Each command in the compressed data is represented using three categories of prefix codes: one set of prefix codes are for the literal sequence lengths (also referred to as literal insertion lengths) and backward copy lengths (that is, a single code word represents two lengths, one of the literal sequence and one of the backward copy), a separate set of prefix codes are for literals, and a third set of prefix codes are for distances. The prefix code descriptions for each meta-block appear in a compact form just before the compressed data in the meta-block header. The insert and copy length and distance prefix codes may be followed by extra bits that are added to the base values determined by the codes. The number of extra bits is determined by the code. One meta-block command then appears as a sequence of prefix codes: Insert and copy length, literal, literal, ..., literal, distance where the insert and copy defines the number of literals that immediately follow and the copy length, and the distance defines how far back to go for the copy, used in combination with the copy length. The resulting uncompressed data is the sequence of bytes: literal, literal, ..., literal, copy, copy, ..., copy where the number of literal bytes and copy bytes are determined by the insert and copy length code. (The number of bytes copied for a static dictionary entry can vary from the copy length.) The last command in the meta-block may end with the last literal if the total uncompressed length of the meta-block has been satisfied. In that case there is no distance in the last command, and the copy length is ignored. There can be more than one prefix code for each category, where the prefix code to use for the next element of that category is determined by the context of the compressed stream that precedes that Alakuijala & Szabadka Expires November 11, 2015 [Page 6] Internet-Draft Brotli May 2015 element. Part of that context is three current block types, one for each category. A block type is in the range of 0..255. For each category there is a count of how many elements of that category remain to be decoded using the current block type. Once that count is expended, a new block type and block count is read from the stream immediately preceding the next element of that category, which will use the new block type. The insert and copy block type directly determines which prefix code to use for the next insert and copy element. For the literal and distance elements, the respective block type is used in combination with other context information to determine which prefix code to use for the next element. Consider the following example: (IaC0, L0, L1, L2, D0)(IaC1, D1)(IaC2, L3, L4, D2)(IaC3, L5, D3) The meta-block here has four commands, contained in parentheses for clarity, where each of the three categories of symbols within these commands can be interpreted using different block types. Here we separate out each category as its own sequence to show an example of block types assigned to those elements. Each square-bracketed group is a block that uses the same block type: [IaC0, IaC1][IaC2, IaC3] <-- insert-and-copy: block types 0 and 1 [L0, L1][L2, L3, L4][L5] <-- literals: block types 0, 1, and 0 [D0][D1, D2, D3] <-- distances: block types 0 and 1 The subsequent blocks within each block category must have different block types, but we see that block types can be reused later in the meta-block. The block types are numbered from 0 to the maximum block type number of 255 and the first block of each block category is type 0. The block structure of a meta-block is represented by the sequence of block-switch commands for each block category, where a block- switch command is a pair <block type, block count>. The block-switch commands are represented in the compressed data before the start of each new block using a prefix code for block types and a separate prefix code for block counts for each block category. For the above example the physical layout of the meta-block is then: IaC0 L0 L1 LBlockSwitch(1, 3) L2 D0 IaC1 DBlockSwitch(1, 3) D1 IaCBlockSwitch(1, 2) IaC2 L3 L4 D2 IaC3 LBlockSwitch(0, 1) L5 D3 where *BlockSwitch(t, n) switches to block type t for a count of n elements. Note that in this example DBlockSwitch(1, 3) immediately Alakuijala & Szabadka Expires November 11, 2015 [Page 7] Internet-Draft Brotli May 2015 precedes the next required distance D1. It does not follow the last distance of the previous block, D0. Whenever an element of a category is needed, and the block count for that category has reached zero, then a new block type and count is read from the stream just before reading that next element. The block switch commands for the first blocks of each category are not part of the meta-block compressed data. Instead the first block type is defined to be 0, and the first block count for each category is encoded in the meta-block header. The prefix codes for the block types and counts, a total of six prefix codes over the three categories, are defined in a compact form in the meta-block header. Each category of value (insert-and-copy lengths, literals and distances) can be encoded with any prefix code from a collection of prefix codes belonging to the same category appearing in the meta- block header. The particular prefix code used can depend on two factors: the block type of the block the value appears in, and the context of the value. In the case of the literals, the context is the previous two bytes in the uncompressed data, and in the case of distances, the context is the copy length from the same command. For insert-and-copy lengths, no context is used and the prefix code depends only on the block type. In the case of literals and distances, the context is mapped to a context ID in the range 0..63 for literals and 0..3 for distances and the matrix of the prefix code indices for each block type and context ID, called the context map, is encoded in a compact form in the meta- block header. For example, the prefix code to use to decode L2 depends on the block type (1), and the literal context ID determined by the two uncompressed bytes that were decoded from L0 and L1. Similarly, the prefix code to use to decode D0 depends on the block type (0), and the distance context ID determined by the copy length decoded from IaC0. The prefix code to use to decode IaC3 depends only on the block type (1). In addition to the parts listed above (prefix code for insert- and- copy lengths, literals, distances, block types and block counts and the context map), the meta-block header contains the number of uncompressed bytes coded in the meta-block and two additional parameters used in the representation of match distances: the number of postfix bits and the number of direct distance codes. A compressed meta-block may be marked in the header as the last meta- block, which terminates the compressed stream. A meta-block may instead simply store the uncompressed data directly as bytes on byte boundaries with no coding or matching strings. In Alakuijala & Szabadka Expires November 11, 2015 [Page 8] Internet-Draft Brotli May 2015 this case the meta-block header information only contains the number of uncompressed bytes and the indication that the meta-block is uncompressed. An uncompressed meta-block cannot be the last meta- block. A meta-block may also be empty, which generates no uncompressed data at all. An empty meta-block may contain metadata information as bytes starting on byte boundaries, which are not part of either the sliding window or the uncompressed data. Thus, these metadata bytes can not be used to create matching strings in subsequent meta-blocks and are not used as context bytes for literals. 3. Compressed representation of prefix codes 3.1. Introduction to prefix coding Prefix coding represents symbols from an a priori known alphabet by bit sequences (codes), one code for each symbol, in a manner such that different symbols may be represented by bit sequences of different lengths, but a parser can always parse an encoded string unambiguously symbol-by-symbol. We define a prefix code in terms of a binary tree in which the two edges descending from each non-leaf node are labeled 0 and 1 and in which the leaf nodes correspond one-for-one with (are labeled with) the symbols of the alphabet; then the code for a symbol is the sequence of 0's and 1's on the edges leading from the root to the leaf labeled with that symbol. For example: /\ Symbol Code 0 1 ------ ---- / \ A 00 /\ B B 1 0 1 C 011 / \ D 010 A /\ 0 1 / \ D C A parser can decode the next symbol from the compressed stream by walking down the tree from the root, at each step choosing the edge corresponding to the next compressed data bit. Given an alphabet with known symbol frequencies, the Huffman algorithm allows the construction of an optimal prefix code (one which represents strings with those symbol frequencies using the fewest bits of any possible prefix codes for that alphabet). Such a Alakuijala & Szabadka Expires November 11, 2015 [Page 9] Internet-Draft Brotli May 2015 prefix code is called a Huffman code. (See [HUFFMAN] in Chapter 5, references for additional information on Huffman codes.) Note that in the brotli format, the prefix codes for the various alphabets must not exceed certain maximum code lengths. This constraint complicates the algorithm for computing code lengths from symbol frequencies. Again, see Chapter 5, references for details. 3.2. Use of prefix coding in the brotli format The prefix codes used for each alphabet in the brotli format are canonical prefix codes, which have two additional rules: * All codes of a given bit length have lexicographically consecutive values, in the same order as the symbols they represent; * Shorter codes lexicographically precede longer codes. We could recode the example above to follow this rule as follows, assuming that the order of the alphabet is ABCD: Symbol Code ------ ---- A 10 B 0 C 110 D 111 I.e., 0 precedes 10 which precedes 11x, and 110 and 111 are lexicographically consecutive. Given this rule, we can define the canonical prefix code for an alphabet just by giving the bit lengths of the codes for each symbol of the alphabet in order; this is sufficient to determine the actual codes. In our example, the code is completely defined by the sequence of bit lengths (2, 1, 3, 3). The following algorithm generates the codes as integers, intended to be read from most- to least- significant bit. The code lengths are initially in tree[I].Len; the codes are produced in tree[I].Code. 1) Count the number of codes for each code length. Let bl_count[N] be the number of codes of length N, N >= 1. 2) Find the numerical value of the smallest code for each code length: Alakuijala & Szabadka Expires November 11, 2015 [Page 10] Internet-Draft Brotli May 2015 code = 0; bl_count[0] = 0; for (bits = 1; bits <= MAX_BITS; bits++) { code = (code + bl_count[bits-1]) << 1; next_code[bits] = code; } 3) Assign numerical values to all codes, using consecutive values for all codes of the same length with the base values determined at step 2. Codes that are never used (which have a bit length of zero) must not be assigned a value. for (n = 0; n <= max_code; n++) { len = tree[n].Len; if (len != 0) { tree[n].Code = next_code[len]; next_code[len]++; } } Example: Consider the alphabet ABCDEFGH, with bit lengths (3, 3, 3, 3, 3, 2, 4, 4). After step 1, we have: N bl_count[N] - ----------- 2 1 3 5 4 2 Step 2 computes the following next_code values: N next_code[N] - ------------ 1 0 2 0 3 2 4 14 Step 3 produces the following code values: Alakuijala & Szabadka Expires November 11, 2015 [Page 11] Internet-Draft Brotli May 2015 Symbol Length Code ------ ------ ---- A 3 010 B 3 011 C 3 100 D 3 101 E 3 110 F 2 00 G 4 1110 H 4 1111 3.3. Alphabet sizes Prefix codes are used for different purposes in the brotli format, and each purpose has a different alphabet size. For literal codes the alphabet size is 256. For insert-and-copy length codes the alphabet size is 704. For block count codes, the alphabet size is 26. For distance codes, block type codes and the prefix codes used in compressing the context map, the alphabet size is dynamic and is based on other parameters. 3.4. Simple prefix codes The first two bits of the compressed representation of each prefix code distinguishes between simple and complex prefix codes. If this value is 1, then a simple prefix code follows. Otherwise the value indicates the number of leading zeros. A simple prefix code can have only up to four symbols with non- zero code length. The format of the simple prefix code is as follows: 2 bits: value of 1 indicates a simple prefix code 2 bits: NSYM - 1, where NSYM = # of symbols coded NSYM symbols, each encoded using ALPHABET_BITS bits 1 bit: tree-select, present only for NSYM = 4 The value of ALPHABET_BITS depends on the alphabet of the prefix code: it is the smallest number of bits that can represent all symbols in the alphabet. E.g. for the alphabet of literal bytes, ALPHABET_BITS is 8. The value of each of the NSYM symbols above is the value of the ALPHABETS_BITS width integer value. (If the integer value is greater than or equal to the alphabet size, then the stream should be rejected as invalid.) Note that the NSYM symbols may not be presented in sorted order. Prefix codes of the same bit length must be assigned to the symbols Alakuijala & Szabadka Expires November 11, 2015 [Page 12] Internet-Draft Brotli May 2015 in sorted order. The (non-zero) code lengths of the symbols can be reconstructed as follows: * if NSYM = 1, the code length for the one symbol is zero -- when encoding this symbol in the compressed data stream using this prefix code, no actual bits are emitted. Similarly, when decoding a symbol using this prefix code, no bits are read and the one symbol is returned. * if NSYM = 2, both symbols have code length 1. * if NSYM = 3, the code lengths for the symbols are 1, 2, 2 in the order they appear in the representation of the simple prefix code. * if NSYM = 4, the code lengths (in order of symbols decoded) depend on the tree-select bit: 2, 2, 2, 2, (tree-select bit 0) or 1, 2, 3, 3 (tree-select bit 1). 3.5. Complex prefix codes A complex prefix code is a canonical prefix code, defined by the sequence of code lengths, as discussed in Paragraph 3.2, above. For even greater compactness, the code length sequences themselves are compressed using a prefix code. The alphabet for code lengths is as follows: 0 - 15: Represent code lengths of 0 - 15 16: Copy the previous non-zero code length 3 - 6 times The next 2 bits indicate repeat length (0 = 3, ... , 3 = 6) If this is the first code length, or all previous code lengths are zero, a code length of 8 is repeated 3 - 6 times A repeated code length code of 16 modifies the repeat count of the previous one as follows: repeat count = (4 * (repeat count - 2)) + (3 - 6 on the next 2 bits) Example: Codes 7, 16 (+2 bits 11), 16 (+2 bits 10) will expand to 22 code lengths of 7 (1 + 4 * (6 - 2) + 5) 17: Repeat a code length of 0 for 3 - 10 times. (3 bits of length) A repeated code length code of 17 modifies the repeat count of the previous one as follows: Alakuijala & Szabadka Expires November 11, 2015 [Page 13] Internet-Draft Brotli May 2015 repeat count = (8 * (repeat count - 2)) + (3 - 10 on the next 3 bits) Note that a code of 16 that follows an immediately preceding 16 modifies the previous repeat count, which becomes the new repeat count. The same is true for a 17 following a 17. A sequence of three or more 16 codes in a row or three of more 17 codes in a row is possible, modifying the count each time. Only the final repeat count is used. The modification only applies if the same code follows. A 16 repeat does not modify an immediately preceding 17 count, nor vice versa. A code length of 0 indicates that the corresponding symbol in the alphabet will not occur in the compressed data, and should not participate in the prefix code construction algorithm given earlier. A complex prefix code must have at least two non-zero code lengths. The bit lengths of the prefix code over the code length alphabet are compressed with the following static prefix code (where the bits shown are reversed in the actual compressed stream): Symbol Code ------ ---- 0 00 1 1110 2 110 3 01 4 10 5 1111 We can now define the format of the complex prefix code as follows: 2 bits: HSKIP, values of 0, 2 or 3 represent the respective number of skipped code lengths. The skipped lengths are taken to be zero. (An HSKIP of 1 indicates a Simple prefix code.) Code lengths for symbols in the code length alphabet given just above, in the order: 1, 2, 3, 4, 0, 5, 17, 6, 16, 7, 8, 9, 10, 11, 12, 13, 14, 15. If HSKIP is 2, then the code lengths for symbols 1 and 2 are zero, and the first code length is for symbol 3. If HSKIP is 3, then the code length for symbol 3 is also zero, and the first code length is for symbol 4. The code lengths of code length symbols are between 0 and 5 and they are represented with 2 - 4 bits according to the static prefix code above. A code length of 0 means Alakuijala & Szabadka Expires November 11, 2015 [Page 14] Internet-Draft Brotli May 2015 the corresponding code length symbol is not used. If HSKIP is 2 or 3, a respective number of leading code lengths are implicit zeros and are not present in the code lengths sequence above. If there are at least two non-zero code lengths, any trailing zero code lengths are omitted, i.e. the last code length in the sequence must be non-zero. In this case the sum of (32 >> code length) over all the non-zero code lengths must equal to 32. If the lengths have been read for the entire code length alphabet and there was only one non-zero code length, then the prefix code has one symbol whose code has zero length. In this case, that symbol results in no bits being emitted by the compressor, and no bits consumed by the decompressor. That single symbol is immediately returned when this code is decoded. An example of where this occurs is if the entire code to be represented has symbols of length 8. E.g. a literal code that represents all literal values with equal probability. In this case the single symbol is 16, which repeats the previous length. The previous length is taken to be 8 before any code length code lengths are read. Sequence of code lengths symbols, encoded using the code length prefix code. Any trailing 0 or 17 must be omitted, i.e. the last encoded code length symbol must be between 1 and 16. The sum of (32768 >> code length) over all the non-zero code lengths in the alphabet, including those encoded using repeat code(s) of 16, must equal to 32768. 4. Encoding of distances As described in Section 2, one component of a compressed meta-block is a sequence of backward distances. In this section we provide the details to the encoding of distances. Each distance in the compressed data part of a meta-block is represented with a pair <distance code, extra bits>. The distance code and the extra bits are encoded back-to-back, the distance code is encoded using a prefix code over the distance alphabet, while the extra bits value is encoded as a fixed-width integer value. The number of extra bits can be 0 - 24, and it is dependent on the distance code. Alakuijala & Szabadka Expires November 11, 2015 [Page 15] Internet-Draft Brotli May 2015 To convert a distance code and associated extra bits to a backward distance, we need the sequence of past distances and two additional parameters, the number of "postfix bits", denoted by NPOSTFIX (0..3), and the number of direct distance codes, denoted by NDIRECT (0..120). Both of these parameters are encoded in the meta-block header. We will also use the following derived parameter: POSTFIX_MASK = ((1 << NPOSTFIX) - 1) The first 16 distance symbols are special symbols that reference past distances as follows: 0: last distance 1: second-to-last distance 2: third-to-last distance 3: fourth-to-last distance 4: last distance - 1 5: last distance + 1 6: last distance - 2 7: last distance + 2 8: last distance - 3 9: last distance + 3 10: second-to-last distance - 1 11: second-to-last distance + 1 12: second-to-last distance - 2 13: second-to-last distance + 2 14: second-to-last distance - 3 15: second-to-last distance + 3 The ring buffer of four last distances is initialized by the values 16, 15, 11 and 4 (i.e. the fourth-to-last is set to 16, the third-to- last to 15, the second-to-last to 11 and the last distance to 4) at the beginning of the *stream* (as opposed to the beginning of the meta- block) and it is not reset at meta-block boundaries. When a distance symbol 0 appears, the distance it represents (i.e. the last distance in the sequence of distances) is not pushed to the ring buffer of last distances, in other words, the expression "(second, third, fourth)-to-last distance" means the (second, third, fourth)-to-last distance that was not represented by a 0 distance symbol. Similarly, distances that represent static dictionary words (see Section 8.) are not pushed to the ring buffer of last distances. The next NDIRECT distance symbols, from 16 to 15 + NDIRECT, represent distances from 1 to NDIRECT. Neither the distance special symbols, nor the NDIRECT direct distance symbols are followed by any extra bits. Distance symbols 16 + NDIRECT and greater all have extra bits, where Alakuijala & Szabadka Expires November 11, 2015 [Page 16] Internet-Draft Brotli May 2015 the number of extra bits for a distance symbol "dcode" is given by the following formula: ndistbits = 1 + ((dcode - NDIRECT - 16) >> (NPOSTFIX + 1)) The maximum number of extra bits is 24, therefore the size of the distance symbol alphabet is (16 + NDIRECT + (48 << NPOSTFIX)). Given a distance symbol "dcode" (>= 16 + NDIRECT), and extra bits "dextra", the backward distance is given by the following formula: hcode = (dcode - NDIRECT - 16) >> NPOSTFIX lcode = (dcode - NDIRECT - 16) & POSTFIX_MASK offset = ((2 + (hcode & 1)) << ndistbits) - 4; distance = ((offset + dextra) << NPOSTFIX) + lcode + NDIRECT + 1 5. Encoding of literal insertion lengths and copy lengths As described in Section 2, the literal insertion lengths and backward copy lengths are encoded using a single prefix code. This section provides the details to this encoding. Each <insertion length, copy length> pair in the compressed data part of a meta-block is represented with the following triplet: <insert-and-copy length code, insert extra bits, copy extra bits> The insert-and-copy length code, the insert extra bits and the copy extra bits are encoded back-to-back, the insert-and-copy length code is encoded using a prefix code over the insert-and-copy length code alphabet, while the extra bits values are encoded as fixed-width integer values. The number of insert and copy extra bits can be 0 - 24, and they are dependent on the insert-and-copy length code. Some of the insert-and-copy length codes also express the fact that the distance symbol of the distance in the same command is 0, i.e. the distance component of the command is the same as that of the previous command. In this case, the distance code and extra bits for the distance are omitted from the compressed data stream. We describe the insert-and-copy length code alphabet in terms of the (not directly used) insert length code and copy length code alphabets. The symbols of the insert length code alphabet, along with the number of insert extra bits and the range of the insert lengths are as follows: Alakuijala & Szabadka Expires November 11, 2015 [Page 17] Internet-Draft Brotli May 2015 Extra Extra Extra Code Bits Lengths Code Bits Lengths Code Bits Lengths ---- ---- ------ ---- ---- ------- ---- ---- ------- 0 0 0 8 2 10-13 16 6 130-193 1 0 1 9 2 14-17 17 7 194-321 2 0 2 10 3 18-25 18 8 322-577 3 0 3 11 3 26-33 19 9 578-1089 4 0 4 12 4 34-49 20 10 1090-2113 5 0 5 13 4 50-65 21 12 2114-6209 6 1 6,7 14 5 66-97 22 14 6210-22593 7 1 8,9 15 5 98-129 23 24 22594-16799809 The symbols of the copy length code alphabet, along with the number of copy extra bits and the range of copy lengths are as follows: Extra Extra Extra Code Bits Lengths Code Bits Lengths Code Bits Lengths ---- ---- ------ ---- ---- ------- ---- ---- ------- 0 0 2 8 1 10,11 16 5 70-101 1 0 3 9 1 12,13 17 5 102-133 2 0 4 10 2 14-17 18 6 134-197 3 0 5 11 2 18-21 19 7 198-325 4 0 6 12 3 22-29 20 8 326-581 5 0 7 13 3 30-37 21 9 582-1093 6 0 8 14 4 38-53 22 10 1094-2117 7 0 9 15 4 54-69 23 24 2118-16779333 To convert an insert-and-copy length code to an insert length code and a copy length code, the following table can be used: Alakuijala & Szabadka Expires November 11, 2015 [Page 18] Internet-Draft Brotli May 2015 Insert length Copy length code code 0-7 8-15 16-23 +---------+---------+ | | | 0-7 | 0-63 | 64-127 | <--- distance symbol 0 | | | +---------+---------+---------+ | | | | 0-7 | 128-191 | 192-255 | 384-447 | | | | | +---------+---------+---------+ | | | | 8-15 | 256-319 | 320-383 | 512-575 | | | | | +---------+---------+---------+ | | | | 16-23 | 448-511 | 576-639 | 640-703 | | | | | +---------+---------+---------+ First, look up the cell with the 64 value range containing the insert-and-copy length code, this gives the insert length code and the copy length code ranges, both 8 values long. The copy length code within its range is determined by the lowest 3 bits of the insert- and-copy length code, and the insert length code within its range is determined by bits 3-5 (counted from the LSB) of the insert- and-copy length code. Given the insert length and copy length codes, the actual insert and copy lengths can be obtained by reading the number of extra bits given by the tables above. If the insert-and-copy length code is between 0 and 127, the distance code of the command is set to zero (the last distance reused). 6. Encoding of block switch commands As described in Section 2, a block-switch command is a pair <block type, block count>. These are encoded in the compressed data part of the meta-block, right before the start of each new block of a particular block category. Each block type in the compressed data is represented with a block type code, encoded using a prefix code over the block type code alphabet. A block type symbol 0 means that the new block type is the same as the type of the previous block from the same block category, i.e. the block type that preceded the current type, while a block type symbol 1 means that the new block type equals the current block type plus one. If the current block type is the maximal possible, Alakuijala & Szabadka Expires November 11, 2015 [Page 19] Internet-Draft Brotli May 2015 then a block type symbol of 1 results in wrapping to a new block type of 0. Block type symbols 2 - 257 represent block types 0 - 255 respectively. The previous and current block types are initialized to 1 and 0, respectively, at the end of the meta-block header. Since the first block type of each block category is 0, the block type of the first block switch command is not encoded in the compressed data. Instead the block count for each category that has more than one type is encoded in the meta-block header. Since the end of the meta-block is detected by the number of uncompressed bytes produced, the block counts for any of the three categories need not count down to exactly zero at the end of the meta-block. The number of different block types in each block category, denoted by NBLTYPESL, NBLTYPESI, and NBLTYPESD for literals, insert-and-copy lengths and distances, respectively, is encoded in the meta-block header, and it must equal to the largest block type plus one in that block category. In other words, the set of literal, insert-and-copy length and distance block types must be [0..NBLTYPESL-1], [0..NBLTYPESI-1], and [0..NBLTYPESD-1], respectively. From this it follows that the alphabet size of literal, insert-and-copy length and distance block type codes is NBLTYPES + 2, NBLTYPESI + 2 and NBLTYPESD + 2, respectively. Each block count in the compressed data is represented with a pair <block count code, extra bits>. The block count code and the extra bits are encoded back-to-back, the block count code is encoded using a prefix code over the block count code alphabet, while the extra bits value is encoded as a fixed-width integer value. The number of extra bits can be 0 - 24, and it is dependent on the block count code. The symbols of the block count code alphabet, along with the number of extra bits and the range of block counts are as follows: Extra Extra Extra Code Bits Lengths Code Bits Lengths Code Bits Lengths ---- ---- ------ ---- ---- ------- ---- ---- ------- 0 2 1-4 9 4 65-80 18 7 369-496 1 2 5-8 10 4 81-96 19 8 497-752 2 2 9-12 11 4 97-112 20 9 753-1264 3 2 13-16 12 5 113-144 21 10 1265-2288 4 3 17-24 13 5 145-176 22 11 2289-4336 5 3 25-32 14 5 177-208 23 12 4337-8432 6 3 33-40 15 5 209-240 24 13 8433-16624 7 3 41-48 16 6 241-304 25 24 16625-16793840 8 4 49-64 17 6 305-368 Alakuijala & Szabadka Expires November 11, 2015 [Page 20] Internet-Draft Brotli May 2015 The first block switch command of each block category is special in the sense that it is encoded in the meta-block header, and as described earlier the block type code is omitted, since it is an implicit zero. 7. Context modeling As described in Section 2, the prefix tree used to encode a literal byte or a distance code depends on the context ID and the block type. This section specifies how to compute the context ID for a particular literal and distance code, and how to encode the context map that maps a <context ID, block type> pair to the index of a prefix code in the array of literal and distance prefix codes. 7.1. Context modes and context ID lookup for literals The context for encoding the next literal is defined by the last two bytes in the stream (p1, p2, where p1 is the most recent byte), regardless if these bytes are produced by backward references or by literal insertions. At the start of the stream p1 and p2 are initialized to zero. There are four methods, called context modes, to compute the Context ID: * MSB6, where the Context ID is the value of six most significant bits of p1, * LSB6, where the Context ID is the value of six least significant bits of p1, * UTF8, where the Context ID is a complex function of p1, p2, optimized for text compression, and * Signed, where Context ID is a complex function of p1, p2, optimized for compressing sequences of signed integers. The Context ID for the UTF8 and Signed context modes is computed using the following lookup tables Lut0, Lut1, and Lut2. Lut0 := 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 4, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 12, 16, 12, 12, 20, 12, 16, 24, 28, 12, 12, 32, 12, 36, 12, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 32, 32, 24, 40, 28, 12, 12, 48, 52, 52, 52, 48, 52, 52, 52, 48, 52, 52, 52, 52, 52, 48, 52, 52, 52, 52, 52, 48, 52, 52, 52, 52, 52, 24, 12, 28, 12, 12, 12, 56, 60, 60, 60, 56, 60, 60, 60, 56, 60, 60, 60, 60, 60, 56, 60, 60, 60, 60, 60, 56, 60, 60, 60, 60, 60, 24, 12, 28, 12, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, Alakuijala & Szabadka Expires November 11, 2015 [Page 21] Internet-Draft Brotli May 2015 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3 Lut1 := 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 Lut2 := 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7 The lengths and zlib CRC-32 (ITU-T Recommendation V.42) check values of each of these tables as a sequence of bytes are as follows: Table Length CRC-32 ----- ------ ------ Lut0 256 0x8e91efb7 Alakuijala & Szabadka Expires November 11, 2015 [Page 22] Internet-Draft Brotli May 2015 Lut1 256 0xd01a32f4 Lut2 256 0x0dd7a0d6 Given p1 is the last uncompressed byte and p2 is the second-to-last uncompressed byte the context IDs can be computed as follows: For LSB6 : Context ID = p1 & 0x3f For MSB6 : Context ID = p1 >> 2 For UTF8 : Context ID = Lut0[p1] | Lut1[p2] For Signed: Context ID = (Lut2[p1] << 3) | Lut2[p2] The context modes LSB6, MSB6, UTF8, and Signed are denoted by integers 0, 1, 2, 3. The context mode is defined for each literal block type and they are stored in a consecutive array of bits in the meta-block header, always two bits per block type. 7.2. Context ID for distances The context for encoding a distance code is defined by the copy length corresponding to the distance. The context IDs are 0, 1, 2, and 3 for copy lengths 2, 3, 4, and more than 4, respectively. 7.3. Encoding of the context map There are two context maps, one for literals and one for distances. The size of the context map is 64 * NBLTYPESL for literals, and 4 * NBLTYPESD for distances. Each value in the context map is an integer between 0 and 255, indicating the index of the prefix code to be used when encoding the next literal or distance. The context map is encoded as a one-dimensional array, CMAPL[0..(64 * NBLTYPESL - 1)] and CMAPD[0..(4 * NBLTYPESD - 1)]. The index of the prefix code for encoding a literal or distance code with context ID "cid" and block type "bltype" is index of literal prefix code = CMAPL[bltype * 64 + cid] index of distance prefix code = CMAPD[bltype * 4 + cid] The values of the context map are encoded with the combination of run length encoding for zero values and prefix coding. Let RLEMAX denote the number of run length codes and NTREES denote the maximum value in the context map plus one. NTREES must equal the number of different values in the context map, in other words, the different values in the context map must be the [0..NTREES-1] interval. The alphabet of Alakuijala & Szabadka Expires November 11, 2015 [Page 23] Internet-Draft Brotli May 2015 the prefix code has the following RLEMAX + NTREES symbols: 0: value zero 1: repeat a zero 2 to 3 times, read 1 bit for repeat length 2: repeat a zero 4 to 7 times, read 2 bits for repeat length ... RLEMAX: repeat a zero (1 << RLEMAX) to (1 << (RLEMAX+1))-1 times, read RLEMAX bits for repeat length RLEMAX + 1: value 1 ... RLEMAX + NTREES - 1: value NTREES - 1 If RLEMAX = 0, the run length coding is not used, and the symbols of the alphabet are directly the values in the context map. We can now define the format of the context map (the same format is used for literal and distance context maps): 1-5 bits: RLEMAX, 0 is encoded with one 0 bit, and values 1 - 16 are encoded with bit pattern xxxx1 (so 01001 is 5) Prefix code with alphabet size NTREES + RLEMAX Context map size values encoded with the above prefix code and run length coding for zero values 1 bit: IMTF bit, if set, we do an inverse move-to-front transform on the values in the context map to get the prefix code indexes For the encoding of NTREES see Section 9.2. We define the inverse move-to-front transform used in this specification by the following C language function: void InverseMoveToFrontTransform(uint8_t* v, int v_len) { uint8_t mtf[256]; int i; for (i = 0; i < 256; ++i) { mtf[i] = (uint8_t)i; } for (i = 0; i < v_len; ++i) { uint8_t index = v[i]; uint8_t value = mtf[index]; v[i] = value; for (; index; --index) { mtf[index] = mtf[index - 1]; } mtf[0] = value; Alakuijala & Szabadka Expires November 11, 2015 [Page 24] Internet-Draft Brotli May 2015 } } 8. Static dictionary At any given point during decoding the compressed data, a reference to a duplicated string in the uncompressed data produced so far has a maximum backward distance value, which is the minimum of the window size and the number of uncompressed bytes produced. However, decoding a distance from the compressed stream, as described in section 4, can produce distances that are greater than this maximum allowed value. The difference between these distances and the first invalid distance value is treated as reference to a word in the static dictionary given in Appendix A. The maximum valid copy length for a static dictionary reference is 24. The static dictionary has three parts: * DICT[0..DICTSIZE], an array of bytes * DOFFSET[0..24], an array of byte offset values for each length * NDBITS[0..24], an array of bit-depth values for each length The number of static dictionary words for a given length is: NWORDS[length] = 0 (if length < 4) NWORDS[length] = (1 << NDBITS[length]) (if length >= 4) DOFFSET and DICTSIZE are defined by the following recursion: DOFFSET[0] = 0 DOFFSET[length + 1] = DOFFSET[length] + length * NWORDS[length] DICTSIZE = DOFFSET[24] + 24 * NWORDS[24] The offset of a word within the DICT array for a given length and index is: offset(length, index) = DOFFSET[length] + index * length Each static dictionary word has 121 different forms, given by applying a word transformation to a base word in the DICT array. The list of word transformations is given in Appendix B. The static dictionary word for a <length, distance> pair can be reconstructed as follows: word_id = distance - (max allowed distance + 1) index = word_id % NWORDS[length] base_word = DICT[offset(length, index)..offset(length, index+1)-1] transform_id = word_id >> NDBITS[length] The string copied to the uncompressed stream is computed by applying Alakuijala & Szabadka Expires November 11, 2015 [Page 25] Internet-Draft Brotli May 2015 the transformation to the base dictionary word. If transform_id is greater than 120 or length is greater than 24, the compressed data set is invalid. Each word transformation has the following form: transform_i(word) = prefix_i + T_i(word) + suffix_i where the _i subscript denotes the transform_id above. Each T_i is one of the following 21 elementary transforms: Identity, OmitLast1, ..., OmitLast9, UppercaseFirst, UppercaseAll, OmitFirst1, ..., OmitFirst9 The form of these elementary transforms are as follows: Identity(word) = word OmitLastk(word) = the first (length(word) - k) bytes of word, or empty string if length(word) < k UppercaseFirst(word) = first UTF-8 character of word upper-cased UppercaseAll(word) = all UTF-8 characters of word upper-cased OmitFirstk(word) = the last (length(word) - k) bytes of word, or empty string if length(word) < k For the purposes of UppercaseAll, word is parsed into UTF-8 characters and converted to upper-case by taking 1 - 3 bytes at a time, using the algorithm below: i = 0 while i < length(word): if word[i] < 192: if word[i] >= 97 and word[i] <= 122: word[i] = word[i] ^ 32 i = i + 1 else if word[i] < 224: if i + 1 < length(word): word[i + 1] = word[i + 1] ^ 32 i = i + 2 else: if i + 2 < length(word): word[i + 2] = word[i + 2] ^ 5 i = i + 3 For UppercaseFirst, the same algorithm is used, but the loop is Alakuijala & Szabadka Expires November 11, 2015 [Page 26] Internet-Draft Brotli May 2015 executed only once. Appendix B. contains the list of transformations by specifying the prefix, elementary transform and suffix components of each of them. Note that the OmitFirst8 elementary transform is not used in the list of transformations. The strings in Appendix B. are in C string format with respect to escape (backslash) characters. 9. Compressed data format In this section we describe the format of the compressed data set in terms of the format of the individual data items described in the previous sections. 9.1. Format of the stream header The stream header has only the following one field: 1-7 bits: WBITS, a value in the range 10 - 24, encoded with the following variable length code (as it appears in the compressed data, where the bits are parsed from right to left): Value Bit Pattern ----- ----------- 10 0100001 11 0110001 12 1000001 13 1010001 14 1100001 15 1110001 16 0 17 0000001 18 0011 19 0101 20 0111 21 1001 22 1011 23 1101 24 1111 Note that bit pattern 0010001 is invalid and must not be used. The size of the sliding window, which is the maximum value of any non-dictionary reference backward distance, is given by the following formula: Alakuijala & Szabadka Expires November 11, 2015 [Page 27] Internet-Draft Brotli May 2015 window size = (1 << WBITS) - 16 9.2. Format of the meta-block header A compliant compressed data set has at least one meta-block. Each meta-block contains a header with information about the uncompressed length of the meta-block, and a bit signaling if the meta-block is the last one. The format of the meta-block header is the following: 1 bit: ISLAST, set to 1 if this is the last meta-block 1 bit: ISLASTEMPTY, set to 1 if the last meta-block is empty, this field is only present if ISLAST bit is set -- if it is 1, then the meta-block and the brotli stream ends at that bit, with any remaining bits in the last byte of the compressed stream filled with zeros (if the fill bits are not zero, then the stream should be rejected as invalid) 2 bits: MNIBBLES, # of nibbles to represent the uncompressed length, encoded as follows: if set to 3, MNIBBLES is 0, otherwise MNIBBLES is the value of this field plus 4. If MNIBBLES is 0, the meta-block is empty, i.e. it does not generate any uncompressed data. In this case, the rest of the meta-block has the following format: 1 bit: reserved, must be zero 2 bits: MSKIPBYTES, # of bytes to represent metadata length MSKIPBYTES x 8 bits: MSKIPLEN - 1, where MSKIPLEN is the number of metadata bytes; this field is only present if MSKIPBYTES is positive, otherwise MSKIPLEN is 0 (if MSKIPBYTES is greater than 1, and the last byte is all zeros, then the stream should be rejected as invalid) 0 - 7 bits: fill bits until the next byte boundary, must be all zeros MSKIPLEN bytes of metadata, not part of the uncompressed data or the sliding window MNIBBLES x 4 bits: MLEN - 1, where MLEN is the length of the meta-block uncompressed data in bytes (if the number of nibbles is greater than 4, and the last nibble is all zeros, then the stream should be rejected as invalid) Alakuijala & Szabadka Expires November 11, 2015 [Page 28] Internet-Draft Brotli May 2015 1 bit: ISUNCOMPRESSED, if set to 1, any bits of compressed data up to the next byte boundary are ignored, and the rest of the meta-block contains MLEN bytes of literal data; this field is only present if the ISLAST bit is not set (if the ignored bits are not all zeros, the stream should be rejected as invalid) 1-11 bits: NBLTYPESL, # of literal block types, encoded with the following variable length code (as it appears in the compressed data, where the bits are parsed from right to left, so 0110111 has the value 12): Value Bit Pattern ----- ----------- 1 0 2 0001 3-4 x0011 5-8 xx0101 9-16 xxx0111 17-32 xxxx1001 33-64 xxxxx1011 65-128 xxxxxx1101 129-256 xxxxxxx1111 Prefix code over the block type code alphabet for literal block types, appears only if NBLTYPESL >= 2 Prefix code over the block count code alphabet for literal block counts, appears only if NBLTYPESL >= 2 Block count code + Extra bits for first literal block count, appears only if NBLTYPESL >= 2 1-11 bits: NBLTYPESI, # of insert-and-copy block types, encoded with the same variable length code as above Prefix code over the block type code alphabet for insert- and-copy block types, only if NBLTYPESI >= 2 Prefix code over the block count code alphabet for insert- and-copy block counts, only if NBLTYPESI >= 2 Block count code + Extra bits for first insert-and-copy block count, only if NBLTYPESI >= 2 1-11 bits: NBLTYPESD, # of distance block types, encoded with the same variable length code as above Alakuijala & Szabadka Expires November 11, 2015 [Page 29] Internet-Draft Brotli May 2015 Prefix code over the block type code alphabet for distance block types, appears only if NBLTYPESD >= 2 Prefix code over the block count code alphabet for distance block counts, only if NBLTYPESD >= 2 Block count code + Extra bits for first distance block count, only if NBLTYPESD >= 2 2 bits: NPOSTFIX, parameter used in the distance coding 4 bits: four most significant bits of NDIRECT, to get the actual value of the parameter NDIRECT, left-shift this four bit number by NPOSTFIX bits NBLTYPESL x 2 bits: context mode for each literal block type 1-11 bits: NTREESL, # of literal prefix trees, encoded with the same variable length code as NBLTYPESL Literal context map, encoded as described in Paragraph 7.3, appears only if NTREESL >= 2, otherwise the context map has only zero values 1-11 bits: NTREESD, # of distance prefix trees, encoded with the same variable length code as NBLTYPESD Distance context map, encoded as described in Paragraph 7.3, appears only if NTREESD >= 2, otherwise the context map has only zero values NTREESL prefix codes for literals NBLTYPESI prefix codes for insert-and-copy lengths NTREESD prefix codes for distances 9.3. Format of the meta-block data The compressed data part of a meta-block consists of a series of commands. Each command has the following format: Block type code for next insert-and-copy block type, appears only if NBLTYPESI >= 2 and the previous insert-and-copy block count is zero Block count code + Extra bits for next insert-and-copy block count, appears only if NBLTYPESI >= 2 and the Alakuijala & Szabadka Expires November 11, 2015 [Page 30] Internet-Draft Brotli May 2015 previous insert-and-copy block count is zero Insert-and-copy length, encoded as in section 5, using the insert-and-copy length prefix code with the current insert-and-copy block type index Insert length number of literals, with the following format: Block type code for next literal block type, appears only if NBLTYPESL >= 2 and the previous literal block count is zero Block count code + Extra bits for next literal block count, appears only if NBLTYPESL >= 2 and the previous literal block count is zero Next byte of the uncompressed data, encoded with the literal prefix code with the index determined by the previous two bytes of the uncompressed data, the current literal block type, and the context map, as described in Paragraph 7.3. Block type code for next distance block type, appears only if NBLTYPESD >= 2 and the previous distance block count is zero Block count code + Extra bits for next distance block length, appears only if NBLTYPESD >= 2 and the previous distance block count is zero Distance code, encoded as in section 4, using the distance prefix code with the current distance block type index, appears only if the distance code is not an implicit 0, as indicated by the insert-and-copy length code The number of commands in the meta-block is such that the sum of insert lengths and copy lengths over all the commands gives the uncompressed length, MLEN encoded in the meta-block header. 10. Decoding algorithm The decoding algorithm that produces the uncompressed data is as follows: read window size do read ISLAST bit if ISLAST Alakuijala & Szabadka Expires November 11, 2015 [Page 31] Internet-Draft Brotli May 2015 read ISLASTEMPTY bit if ISLASTEMPTY break from loop read MNIBBLES if MNIBBLES is zero verify reserved bit is zero read MSKIPLEN skip any bits up to the next byte boundary skip MSKIPLEN bytes continue to the next meta-block else read MLEN if not ISLAST read ISUNCOMPRESSED bit if ISUNCOMPRESSED skip any bits up to the next byte boundary copy MLEN bytes of compressed data as literals continue to the next meta-block loop for each three block categories (i = L, I, D) read NBLTYPESi if NBLTYPESi >= 2 read prefix code for block types, HTREE_BTYPE_i read prefix code for block counts, HTREE_BLEN_i read block count, BLEN_i set block type, BTYPE_i to 0 initialize second-to-last and last block types to 0 and 1 else set block type, BTYPE_i to 0 set block count, BLEN_i to 268435456 read NPOSTFIX and NDIRECT read array of literal context modes, CMODE[] read NTREESL if NTREESL >= 2 read literal context map, CMAPL[] else fill CMAPL[] with zeros read NTREESD if NTREESD >= 2 read distance context map, CMAPD[] else fill CMAPD[] with zeros read array of prefix codes for literals, HTREEL[] read array of prefix codes for insert-and-copy, HTREEI[] read array of prefix codes for distances, HTREED[] do if BLEN_I is zero read block type using HTREE_BTYPE_I and set BTYPE_I save previous block type Alakuijala & Szabadka Expires November 11, 2015 [Page 32] Internet-Draft Brotli May 2015 read block count using HTREE_BLEN_I and set BLEN_I decrement BLEN_I read insert and copy length, ILEN, CLEN with HTREEI[BTYPE_I] loop for ILEN if BLEN_L is zero read block type using HTREE_BTYPE_L and set BTYPE_L save previous block type read block count using HTREE_BLEN_L and set BLEN_L decrement BLEN_L look up context mode CMODE[BTYPE_L] compute context ID, CIDL from last two uncompressed bytes read literal using HTREEL[CMAPL[64 * BTYPE_L + CIDL]] write literal to uncompressed stream if number of uncompressed bytes produced in the loop for this meta-block is MLEN, then break from loop (in this case the copy length is ignored and can have any value) if distance code is implicit zero from insert-and-copy code set backward distance to the last distance else if BLEN_D is zero read block type using HTREE_BTYPE_D and set BTYPE_D save previous block type read block count using HTREE_BLEN_D and set BLEN_D decrement BLEN_D compute context ID, CIDD from CLEN read distance code with HTREED[CMAPD[4 * BTYPE_D + CIDD]] compute distance by distance short code substitution move backwards distance bytes in the uncompressed data and copy CLEN bytes from this position to the uncompressed stream, or look up the static dictionary word, transform the word as directed, and copy the result to the uncompressed stream while number of uncompressed bytes for this meta-block < MLEN while not ISLAST Note that a duplicated string reference may refer to a string in a previous meta-block, i.e. the backward distance may cross one or more meta-block boundaries. However a backward copy distance will not refer past the beginning of the uncompressed stream or the window size; any such distance is interpreted as a reference to a static dictionary word. Also note that the referenced string may overlap the current position, for example, if the last 2 bytes decoded have values X and Y, a string reference with <length = 5, distance = 2> adds X,Y,X,Y,X to the uncompressed stream. 11. Security Considerations As with any compressed file formats, decompressor implementations Alakuijala & Szabadka Expires November 11, 2015 [Page 33] Internet-Draft Brotli May 2015 should handle all compressed data byte sequences, not only those that conform to this specification, where non-conformant compressed data sequences should be discarded. A possible attack against a system containing a decompressor implementation (e.g. a web browser) is to exploit a buffer overflow caused by an invalid compressed data. Therefore decompressor implementations should perform bound-checking for each memory access that result from values decoded from the compressed stream. 12. IANA Considerations This document has no actions for IANA. 13. Informative References [HUFFMAN] Huffman, D. A., "A Method for the Construction of Minimum Redundancy Codes", Proceedings of the Institute of Radio Engineers, September 1952, Volume 40, Number 9, pp. 1098-1101. [LZ77] Ziv J., Lempel A., "A Universal Algorithm for Sequential Data Compression", IEEE Transactions on Information Theory, Vol. 23, No. 3, pp. 337-343. [RFC1951] Deutsch, P., "DEFLATE Compressed Data Format Specification version 1.3", RFC 1951, Aladdin Enterprises, May 1996. http://www.ietf.org/rfc/rfc1951.txt [WOFF2] Levantovsky, V. (ed.), Levien, R. (ed.), "WOFF File Format 2.0", W3C WebFonts Working Group, http://www.w3.org/TR/WOFF2/ 14. Source code Source code for a C language implementation of a brotli compliant decompressor and a C++ language implementation of a compressor is available in the brotli open-source project: https://github.com/google/brotli 15. Acknowledgements The authors would like to thank Mark Adler for providing helpful review comments, validating the specification by writing an independent decompressor and suggesting improvements to the format and the text of the specification. Appendix A. Static dictionary data Alakuijala & Szabadka Expires November 11, 2015 [Page 34] Internet-Draft Brotli May 2015 The hexadecimal form of the DICT array is the following, where the length is 122,784 bytes and the zlib CRC-32 of the byte sequence is 0x5136cb04. 74696d65646f776e6c6966656c6566746261636b636f64656461746173686f77 6f6e6c7973697465636974796f70656e6a7573746c696b6566726565776f726b 74657874796561726f766572626f64796c6f7665666f726d626f6f6b706c6179 6c6976656c696e6568656c70686f6d65736964656d6f7265776f72646c6f6e67 7468656d7669657766696e64706167656461797366756c6c686561647465726d 656163686172656166726f6d747275656d61726b61626c6575706f6e68696768 646174656c616e646e6577736576656e6e65787463617365626f7468706f7374 757365646d61646568616e6468657265776861746e616d654c696e6b626c6f67 73697a656261736568656c646d616b656d61696e757365722729202b686f6c64 656e6473776974684e65777372656164776572657369676e74616b6568617665 67616d657365656e63616c6c7061746877656c6c706c75736d656e7566696c6d 706172746a6f696e746869736c697374676f6f646e6565647761797377657374 6a6f62736d696e64616c736f6c6f676f72696368757365736c6173747465616d 61726d79666f6f646b696e6777696c6c65617374776172646265737466697265 506167656b6e6f77617761792e706e676d6f76657468616e6c6f616467697665 73656c666e6f74656d756368666565646d616e79726f636b69636f6e6f6e6365 6c6f6f6b6869646564696564486f6d6572756c65686f7374616a6178696e666f 636c75626c6177736c65737368616c66736f6d65737563687a6f6e6531303025 6f6e65736361726554696d6572616365626c7565666f75727765656b66616365 686f706567617665686172646c6f73747768656e7061726b6b65707470617373 73686970726f6f6d48544d4c706c616e54797065646f6e65736176656b656570 666c61676c696e6b736f6c6466697665746f6f6b72617465746f776e6a756d70 746875736461726b6361726466696c6566656172737461796b696c6c74686174 66616c6c6175746f657665722e636f6d74616c6b73686f70766f746564656570 6d6f6465726573747475726e626f726e62616e6466656c6c726f736575726c28 736b696e726f6c65636f6d6561637473616765736d656574676f6c642e6a7067 6974656d7661727966656c747468656e73656e6464726f7056696577636f7079 312e30223c2f613e73746f70656c73656c696573746f75727061636b2e676966 706173746373733f677261796d65616e2667743b7269646573686f746c617465 73616964726f6164766172206665656c6a6f686e7269636b706f727466617374 2755412d646561643c2f623e706f6f7262696c6c74797065552e532e776f6f64 6d7573743270783b496e666f72616e6b7769646577616e7477616c6c6c656164 5b305d3b7061756c776176657375726524282723776169746d61737361726d73 676f65736761696e6c616e6770616964212d2d206c6f636b756e6974726f6f74 77616c6b6669726d77696665786d6c22736f6e6774657374323070786b696e64 726f7773746f6f6c666f6e746d61696c73616665737461726d617073636f7265 7261696e666c6f77626162797370616e736179733470783b3670783b61727473 666f6f747265616c77696b696865617473746570747269706f72672f6c616b65 7765616b746f6c64466f726d6361737466616e7362616e6b7665727972756e73 6a756c797461736b3170783b676f616c67726577736c6f776564676569643d22 736574733570783b2e6a733f3430707869662028736f6f6e736561746e6f6e65 747562657a65726f73656e747265656466616374696e746f676966746861726d 3138707863616d6568696c6c626f6c647a6f6f6d766f69646561737972696e67 66696c6c7065616b696e6974636f73743370783b6a61636b7461677362697473 Alakuijala & Szabadka Expires November 11, 2015 [Page 35] Internet-Draft Brotli May 2015 726f6c6c656469746b6e65776e6561723c212d2d67726f774a534f4e64757479 4e616d6573616c65796f75206c6f74737061696e6a617a7a636f6c6465796573 666973687777772e7269736b7461627370726576313070787269736532357078 426c756564696e673330302c62616c6c666f72646561726e77696c64626f782e 666169726c61636b76657273706169726a756e6574656368696628217069636b 6576696c242822237761726d6c6f7264646f657370756c6c2c30303069646561 647261776875676573706f7466756e646275726e6872656663656c6c6b657973 7469636b686f75726c6f73736675656c31327078737569746465616c52535322 6167656467726579474554226561736561696d736769726c616964733870783b 6e617679677269647469707323393939776172736c61647963617273293b207d 7068703f68656c6c74616c6c77686f6d7a683ae52a2f0d0a2031303068616c6c 2e0a0a413770783b70757368636861743070783b637265772a2f3c2f68617368 37357078666c6174726172652026262074656c6c63616d706f6e746f6c616964 6d697373736b697074656e7466696e656d616c6567657473706c6f743430302c 0d0a0d0a636f6f6c666565742e7068703c62723e657269636d6f737467756964 62656c6c64657363686169726d61746861746f6d2f696d67262338326c75636b 63656e743030303b74696e79676f6e6568746d6c73656c6c6472756746524545 6e6f64656e69636b3f69643d6c6f73656e756c6c7661737477696e6452535320 7765617272656c796265656e73616d6564756b656e6173616361706577697368 67756c665432333a68697473736c6f74676174656b69636b626c757274686579 313570782727293b293b223e6d73696577696e7362697264736f727462657461 7365656b5431383a6f726473747265656d616c6c363070786661726de2809973 626f79735b305d2e27293b22504f5354626561726b696473293b7d7d6d617279 74656e6428554b29717561647a683ae62d73697a2d2d2d2d70726f7027293b0d 6c6966745431393a76696365616e6479646562743e525353706f6f6c6e65636b 626c6f775431363a646f6f726576616c5431373a6c6574736661696c6f72616c 706f6c6c6e6f7661636f6c7367656e6520e28094736f6674726f6d6574696c6c 726f73733c68333e706f75726661646570696e6b3c74723e6d696e69297c2128 6d696e657a683ae862617273686561723030293b6d696c6b202d2d3e69726f6e 667265646469736b77656e74736f696c707574732f6a732f686f6c795432323a 4953424e5432303a6164616d736565733c68323e6a736f6e272c2027636f6e74 5432313a205253536c6f6f70617369616d6f6f6e3c2f703e736f756c4c494e45 666f7274636172745431343a3c68313e38307078212d2d3c3970783b5430343a 6d696b653a34365a6e696365696e6368596f726b726963657a683ae42729293b 707572656d61676570617261746f6e65626f6e643a33375a5f6f665f275d293b 3030302c7a683ae774616e6b79617264626f776c627573683a35365a4a617661 333070780a7c7d0a254333253a33345a6a656666455850496361736876697361 676f6c66736e6f777a683ae9717565722e6373737369636b6d6561746d696e2e 62696e6464656c6c686972657069637372656e743a33365a485454502d323031 666f746f776f6c66454e442078626f783a35345a424f44596469636b3b0a7d0a 657869743a33355a7661727362656174277d293b646965743939393b616e6e65 7d7d3c2f5b695d2e4c616e676b6dc2b277697265746f7973616464737365616c 616c65783b0a097d6563686f6e696e652e6f726730303529746f6e796a657773 73616e646c656773726f6f66303030292032303077696e6567656172646f6773 626f6f74676172796375747374796c6574656d7074696f6e2e786d6c636f636b 67616e672428272e3530707850682e446d697363616c616e6c6f616e6465736b 6d696c657279616e756e697864697363293b7d0a64757374636c6970292e0a0a 373070782d32303044564473375d3e3c7461706564656d6f692b2b2977616765 Alakuijala & Szabadka Expires November 11, 2015 [Page 36] Internet-Draft Brotli May 2015 6575726f7068696c6f707473686f6c65464151736173696e2d3236546c616273 7065747355524c2062756c6b636f6f6b3b7d0d0a484541445b305d2961626272 6a75616e283139386c6573687477696e3c2f693e736f6e79677579736675636b 706970657c2d0a21303032296e646f775b315d3b5b5d3b0a4c6f672073616c74 0d0a090962616e677472696d62617468297b0d0a303070780a7d293b6b6f3aec 6665657361643e0d733a2f2f205b5d3b746f6c6c706c756728297b0a7b0d0a20 2e6a7327323030706475616c626f61742e4a5047293b0a7d71756f74293b0a0a 27293b0a0d0a7d0d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f6d6f 6dc3a17365737465657374617065726f746f646f686163656361646161c3b16f 6269656e64c3ad616173c3ad766964616361736f6f74726f666f726f736f6c6f 6f7472616375616c64696a6f7369646f6772616e7469706f74656d6164656265 616c676f7175c3a96573746f6e61646174726573706f636f6361736162616a6f 746f646173696e6f6167756170756573756e6f73616e7465646963656c756973 656c6c616d61796f7a6f6e61616d6f727069736f6f627261636c6963656c6c6f 64696f73686f726163617369d0b7d0b0d0bdd0b0d0bed0bcd180d0b0d180d183 d182d0b0d0bdd0b5d0bfd0bed0bed182d0b8d0b7d0bdd0bed0b4d0bed182d0be d0b6d0b5d0bed0bdd0b8d185d09dd0b0d0b5d0b5d0b1d18bd0bcd18bd092d18b d181d0bed0b2d18bd0b2d0bed09dd0bed0bed0b1d09fd0bed0bbd0b8d0bdd0b8 d0a0d0a4d09dd0b5d09cd18bd182d18bd09ed0bdd0b8d0bcd0b4d0b0d097d0b0 d094d0b0d09dd183d09ed0b1d182d0b5d098d0b7d0b5d0b9d0bdd183d0bcd0bc d0a2d18bd183d0b6d981d98ad8a3d986d985d8a7d985d8b9d983d984d8a3d988 d8b1d8afd98ad8a7d981d989d987d988d984d985d984d983d8a7d988d984d987 d8a8d8b3d8a7d984d8a5d986d987d98ad8a3d98ad982d8afd987d984d8abd985 d8a8d987d984d988d984d98ad8a8d984d8a7d98ad8a8d983d8b4d98ad8a7d985 d8a3d985d986d8aad8a8d98ad984d986d8add8a8d987d985d985d8b4d988d8b4 6669727374766964656f6c69676874776f726c646d656469617768697465636c 6f7365626c61636b7269676874736d616c6c626f6f6b73706c6163656d757369 636669656c646f72646572706f696e7476616c75656c6576656c7461626c6562 6f617264686f75736567726f7570776f726b7379656172737374617465746f64 6179776174657273746172747374796c656465617468706f77657270686f6e65 6e696768746572726f72696e70757461626f75747465726d737469746c65746f 6f6c736576656e746c6f63616c74696d65736c61726765776f72647367616d65 7373686f72747370616365666f637573636c6561726d6f64656c626c6f636b67 75696465726164696f7368617265776f6d656e616761696e6d6f6e6579696d61 67656e616d6573796f756e676c696e65736c61746572636f6c6f72677265656e 66726f6e7426616d703b7761746368666f726365707269636572756c65736265 67696e616674657276697369746973737565617265617362656c6f77696e6465 Alakuijala & Szabadka Expires November 11, 2015 [Page 37] Internet-Draft Brotli May 2015 78746f74616c686f7572736c6162656c7072696e7470726573736275696c746c 696e6b73737065656473747564797472616465666f756e6473656e7365756e64 657273686f776e666f726d7372616e676561646465647374696c6c6d6f766564 74616b656e61626f7665666c61736866697865646f6674656e6f746865727669 657773636865636b6c6567616c72697665726974656d73717569636b73686170 6568756d616e6578697374676f696e676d6f7669657468697264626173696370 65616365737461676577696474686c6f67696e696465617377726f7465706167 65737573657273647269766573746f7265627265616b736f757468766f696365 73697465736d6f6e746877686572656275696c6477686963686561727468666f 72756d746872656573706f72747061727479436c69636b6c6f7765726c697665 73636c6173736c61796572656e74727973746f72797573616765736f756e6463 6f757274796f7572206269727468706f70757074797065736170706c79496d61 67656265696e6775707065726e6f746573657665727973686f77736d65616e73 65787472616d61746368747261636b6b6e6f776e6561726c79626567616e7375 70657270617065726e6f7274686c6561726e676976656e6e616d6564656e6465 645465726d73706172747347726f75706272616e647573696e67776f6d616e66 616c73657265616479617564696f74616b65737768696c652e636f6d2f6c6976 656463617365736461696c796368696c6467726561746a7564676574686f7365 756e6974736e6576657262726f6164636f617374636f7665726170706c656669 6c65736379636c657363656e65706c616e73636c69636b777269746571756565 6e7069656365656d61696c6672616d656f6c64657270686f746f6c696d697463 61636865636976696c7363616c65656e7465727468656d657468657265746f75 6368626f756e64726f79616c61736b656477686f6c6573696e636573746f636b 206e616d6566616974686865617274656d7074796f6666657273636f70656f77 6e65646d69676874616c62756d7468696e6b626c6f6f6461727261796d616a6f 72747275737463616e6f6e756e696f6e636f756e7476616c696473746f6e6553 74796c654c6f67696e68617070796f636375726c6566743a6672657368717569 746566696c6d7367726164656e65656473757262616e66696768746261736973 686f7665726175746f3b726f7574652e68746d6c6d6978656466696e616c596f 757220736c696465746f70696362726f776e616c6f6e65647261776e73706c69 747265616368526967687464617465736d6172636871756f7465676f6f64734c 696e6b73646f7562746173796e637468756d62616c6c6f776368696566796f75 74686e6f76656c313070783b7365727665756e74696c68616e6473436865636b 537061636571756572796a616d6573657175616c7477696365302c3030305374 61727470616e656c736f6e6773726f756e6465696768747368696674776f7274 68706f7374736c656164737765656b7361766f696474686573656d696c657370 6c616e65736d617274616c706861706c616e746d61726b737261746573706c61 7973636c61696d73616c65737465787473737461727377726f6e673c2f68333e 7468696e672e6f72672f6d756c74696865617264506f7765727374616e64746f 6b656e736f6c696428746869736272696e677368697073737461666674726965 6463616c6c7366756c6c7966616374736167656e7454686973202f2f2d2d3e61 646d696e65677970744576656e74313570783b456d61696c747275652263726f 73737370656e74626c6f6773626f78223e6e6f7465646c656176656368696e61 73697a657367756573743c2f68343e726f626f746865617679747275652c7365 76656e6772616e646372696d657369676e73617761726564616e636570686173 653e3c212d2d656e5f5553262333393b32303070785f6e616d656c6174696e65 6e6a6f79616a61782e6174696f6e736d697468552e532e20686f6c6473706574 6572696e6469616e6176223e636861696e73636f7265636f6d6573646f696e67 Alakuijala & Szabadka Expires November 11, 2015 [Page 38] Internet-Draft Brotli May 2015 7072696f7253686172653139393073726f6d616e6c697374736a6170616e6661 6c6c73747269616c6f776e657261677265653c2f68323e6162757365616c6572 746f70657261222d2f2f57636172647368696c6c737465616d7350686f746f74 72757468636c65616e2e7068703f7361696e746d6574616c6c6f7569736d6561 6e7470726f6f666272696566726f77223e67656e7265747275636b6c6f6f6b73 56616c75654672616d652e6e65742f2d2d3e0a3c747279207b0a766172206d61 6b6573636f737473706c61696e6164756c747175657374747261696e6c61626f 7268656c707363617573656d616769636d6f746f72746865697232353070786c 656173747374657073436f756e74636f756c64676c617373736964657366756e 6473686f74656c61776172646d6f7574686d6f76657370617269736769766573 6475746368746578617366727569746e756c6c2c7c7c5b5d3b746f70223e0a3c 212d2d504f5354226f6365616e3c62722f3e666c6f6f72737065616b64657074 682073697a6562616e6b7363617463686368617274323070783b616c69676e64 65616c73776f756c64353070783b75726c3d227061726b736d6f7573654d6f73 74202e2e2e3c2f616d6f6e67627261696e626f6479206e6f6e653b6261736564 636172727964726166747265666572706167655f686f6d652e6d657465726465 6c6179647265616d70726f76656a6f696e743c2f74723e64727567733c212d2d 20617072696c696465616c616c6c656e6578616374666f727468636f6465736c 6f67696356696577207365656d73626c616e6b706f7274732028323030736176 65645f6c696e6b676f616c736772616e74677265656b686f6d657372696e6773 7261746564333070783b77686f7365706172736528293b2220426c6f636b6c69 6e75786a6f6e6573706978656c27293b223e293b6966282d6c65667464617669 64686f727365466f6375737261697365626f786573547261636b656d656e743c 2f656d3e626172223e2e7372633d746f776572616c743d226361626c6568656e 7279323470783b73657475706974616c7973686172706d696e6f727461737465 77616e7473746869732e7265736574776865656c6769726c732f6373732f3130 30253b636c75627373747566666269626c65766f74657320313030306b6f7265 617d293b0d0a62616e647371756575653d207b7d3b383070783b636b696e677b 0d0a09096168656164636c6f636b69726973686c696b6520726174696f737461 7473466f726d227961686f6f295b305d3b41626f757466696e64733c2f68313e 64656275677461736b7355524c203d63656c6c737d2928293b313270783b7072 696d6574656c6c737475726e7330783630302e6a706722737061696e62656163 6874617865736d6963726f616e67656c2d2d3e3c2f676966747373746576652d 6c696e6b626f64792e7d293b0a096d6f756e7420283139394641513c2f726f67 65726672616e6b436c617373323870783b66656564733c68313e3c73636f7474 7465737473323270783b6472696e6b29207c7c206c657769737368616c6c2330 33393b20666f72206c6f7665647761737465303070783b6a613ae38273696d6f 6e3c666f6e747265706c796d65657473756e7465726368656170746967687442 72616e642920213d206472657373636c697073726f6f6d736f6e6b65796d6f62 696c6d61696e2e4e616d6520706c61746566756e6e797472656573636f6d2f22 312e6a7067776d6f6465706172616d53544152546c65667420696464656e2c20 323031293b0a7d0a666f726d2e766972757363686169727472616e73776f7273 7450616765736974696f6e70617463683c212d2d0a6f2d6361636669726d7374 6f7572732c30303020617369616e692b2b297b61646f626527295b305d69643d 3130626f74683b6d656e75202e322e6d692e706e67226b6576696e636f616368 4368696c646272756365322e6a706755524c292b2e6a70677c7375697465736c 69636568617272793132302220737765657474723e0d0a6e616d653d64696567 6f706167652073776973732d2d3e0a0a236666663b223e4c6f672e636f6d2274 Alakuijala & Szabadka Expires November 11, 2015 [Page 39] Internet-Draft Brotli May 2015 7265617473686565742920262620313470783b736c6565706e74656e7466696c 65646a613ae38369643d22634e616d6522776f72736573686f74732d626f782d 64656c74610a266c743b62656172733a34385a3c646174612d727572616c3c2f 613e207370656e6462616b657273686f70733d2022223b706870223e6374696f 6e313370783b627269616e68656c6c6f73697a653d6f3d253246206a6f696e6d 617962653c696d6720696d67223e2c20666a73696d67222022295b305d4d546f 704254797065226e65776c7944616e736b637a656368747261696c6b6e6f7773 3c2f68353e666171223e7a682d636e3130293b0a2d3122293b747970653d626c 7565737472756c7964617669732e6a73273b3e0d0a3c21737465656c20796f75 2068323e0d0a666f726d206a6573757331303025206d656e752e0d0a090d0a77 616c65737269736b73756d656e746464696e67622d6c696b7465616368676966 2220766567617364616e736b6565737469736871697073756f6d69736f627265 6465736465656e747265746f646f73707565646561c3b16f73657374c3a17469 656e6568617374616f74726f737061727465646f6e64656e7565766f68616365 72666f726d616d69736d6f6d656a6f726d756e646f617175c3ad64c3ad617373 c3b36c6f61797564616665636861746f64617374616e746f6d656e6f73646174 6f736f74726173736974696f6d7563686f61686f72616c756761726d61796f72 6573746f73686f72617374656e6572616e746573666f746f7365737461737061 c3ad736e7565766173616c7564666f726f736d6564696f717569656e6d657365 73706f6465726368696c65736572c3a1766563657364656369726a6f73c3a965 7374617276656e7461677275706f686563686f656c6c6f7374656e676f616d69 676f636f7361736e6976656c67656e74656d69736d6161697265736a756c696f 74656d617368616369616661766f726a756e696f6c6962726570756e746f6275 656e6f6175746f72616272696c6275656e61746578746f6d61727a6f73616265 726c697374616c7565676f63c3b36d6f656e65726f6a7565676f706572c3ba68 616265726573746f796e756e63616d756a657276616c6f7266756572616c6962 726f6775737461696775616c766f746f736361736f736775c3ad61707565646f 736f6d6f73617669736f7573746564646562656e6e6f63686562757363616661 6c74616575726f737365726965646963686f637572736f636c61766563617361 736c65c3b36e706c617a6f6c6172676f6f62726173766973746161706f796f6a 756e746f7472617461766973746f637265617263616d706f68656d6f7363696e 636f636172676f7069736f736f7264656e686163656ec3a1726561646973636f 706564726f63657263617075656461706170656c6d656e6f72c3ba74696c636c 61726f6a6f72676563616c6c65706f6e657274617264656e616469656d617263 617369677565656c6c61737369676c6f636f6368656d6f746f736d6164726563 6c617365726573746f6e69c3b16f7175656461706173617262616e636f68696a 6f737669616a657061626c6fc3a97374657669656e657265696e6f64656a6172 666f6e646f63616e616c6e6f7274656c657472616361757361746f6d61726d61 6e6f736c756e65736175746f7376696c6c6176656e646f70657361727469706f 7374656e67616d6172636f6c6c6576617061647265756e69646f76616d6f737a 6f6e6173616d626f7362616e64616d61726961616275736f6d75636861737562 697272696f6a617669766972677261646f6368696361616c6cc3ad6a6f76656e 6469636861657374616e74616c657373616c69727375656c6f7065736f736669 6e65736c6c616d61627573636fc3a97374616c6c6567616e6567726f706c617a 6168756d6f7270616761726a756e7461646f626c6569736c6173626f6c736162 61c3b16f6861626c616c75636861c381726561646963656e6a756761726e6f74 617376616c6c65616c6cc3a16361726761646f6c6f726162616a6f657374c3a9 677573746f6d656e74656d6172696f6669726d61636f73746f6669636861706c Alakuijala & Szabadka Expires November 11, 2015 [Page 40] Internet-Draft Brotli May 2015 617461686f67617261727465736c65796573617175656c6d7573656f62617365 73706f636f736d697461646369656c6f636869636f6d6965646f67616e617273 616e746f65746170616465626573706c61796172656465737369657465636f72 7465636f7265616475646173646573656f7669656a6f64657365616167756173 2671756f743b646f6d61696e636f6d6d6f6e7374617475736576656e74736d61 7374657273797374656d616374696f6e62616e6e657272656d6f76657363726f 6c6c757064617465676c6f62616c6d656469756d66696c7465726e756d626572 6368616e6765726573756c747075626c696373637265656e63686f6f73656e6f 726d616c74726176656c697373756573736f7572636574617267657473707269 6e676d6f64756c656d6f62696c6573776974636870686f746f73626f72646572 726567696f6e697473656c66736f6369616c616374697665636f6c756d6e7265 636f7264666f6c6c6f777469746c653e6569746865726c656e67746866616d69 6c79667269656e646c61796f7574617574686f72637265617465726576696577 73756d6d6572736572766572706c61796564706c61796572657870616e64706f 6c696379666f726d6174646f75626c65706f696e747373657269657370657273 6f6e6c6976696e6764657369676e6d6f6e746873666f72636573756e69717565 77656967687470656f706c65656e657267796e61747572657365617263686669 67757265686176696e67637573746f6d6f66667365746c657474657277696e64 6f777375626d697472656e64657267726f75707375706c6f61646865616c7468 6d6574686f64766964656f737363686f6f6c667574757265736861646f776465 6261746576616c7565734f626a6563746f74686572737269676874736c656167 75656368726f6d6573696d706c656e6f74696365736861726564656e64696e67 736561736f6e7265706f72746f6e6c696e65737175617265627574746f6e696d 61676573656e61626c656d6f76696e676c617465737477696e7465724672616e 6365706572696f647374726f6e677265706561744c6f6e646f6e64657461696c 666f726d656464656d616e64736563757265706173736564746f67676c65706c 6163657364657669636573746174696363697469657373747265616d79656c6c 6f7761747461636b737472656574666c6967687468696464656e696e666f223e 6f70656e656475736566756c76616c6c65796361757365736c65616465727365 637265747365636f6e6464616d61676573706f72747365786365707472617469 6e677369676e65647468696e67736566666563746669656c6473737461746573 6f666669636576697375616c656469746f72766f6c756d655265706f72746d75 7365756d6d6f76696573706172656e746163636573736d6f73746c796d6f7468 6572222069643d226d61726b657467726f756e646368616e6365737572766579 6265666f726573796d626f6c6d6f6d656e747370656563686d6f74696f6e696e 736964656d617474657243656e7465726f626a6563746578697374736d696464 6c654575726f706567726f7774686c65676163796d616e6e6572656e6f756768 636172656572616e737765726f726967696e706f7274616c636c69656e747365 6c65637472616e646f6d636c6f736564746f70696373636f6d696e6766617468 65726f7074696f6e73696d706c7972616973656465736361706563686f73656e 636875726368646566696e65726561736f6e636f726e65726f75747075746d65 6d6f7279696672616d65706f6c6963656d6f64656c734e756d62657264757269 6e676f66666572737374796c65736b696c6c65646c697374656463616c6c6564 73696c7665726d617267696e64656c65746562657474657262726f7773656c69 6d697473476c6f62616c73696e676c6577696467657463656e74657262756467 65746e6f77726170637265646974636c61696d73656e67696e65736166657479 63686f6963657370697269742d7374796c657370726561646d616b696e676e65 65646564727573736961706c65617365657874656e7453637269707462726f6b Alakuijala & Szabadka Expires November 11, 2015 [Page 41] Internet-Draft Brotli May 2015 656e616c6c6f7773636861726765646976696465666163746f726d656d626572 2d62617365647468656f7279636f6e66696761726f756e64776f726b65646865 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61636564636f76657273706c7567696e352c3030302070616765223e626f7374 Alakuijala & Szabadka Expires November 11, 2015 [Page 42] Internet-Draft Brotli May 2015 6f6e2e74657374286176617461727465737465645f636f756e74666f72756d73 736368656d61696e6465782c66696c6c6564736861726573726561646572616c 657274286170706561725375626d69746c696e65223e626f6479223e0a2a2054 686554686f756768736565696e676a65727365794e6577733c2f766572696679 657870657274696e6a75727977696474683d436f6f6b69655354415254206163 726f73735f696d6167657468726561646e6174697665706f636b6574626f7822 3e0a53797374656d20446176696463616e6365727461626c657370726f766564 417072696c207265616c6c796472697665726974656d223e6d6f7265223e626f 61726473636f6c6f727363616d7075736669727374207c7c205b5d3b6d656469 612e67756974617266696e69736877696474683a73686f7765644f7468657220 2e7068702220617373756d656c617965727377696c736f6e73746f7265737265 6c69656673776564656e437573746f6d656173696c7920796f75722053747269 6e670a0a5768696c7461796c6f72636c6561723a7265736f72746672656e6368 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Expires November 11, 2015 [Page 53] Internet-Draft Brotli May 2015 6c76696577696e676d6964646c6520637269636b657470726f70686574736869 66746564646f63746f727352757373656c6c20746172676574636f6d70616374 616c6765627261736f6369616c2d62756c6b206f666d616e20616e643c2f7464 3e0a206865206c656674292e76616c282966616c7365293b6c6f676963616c62 616e6b696e67686f6d6520746f6e616d696e67204172697a6f6e616372656469 7473293b0a7d293b0a666f756e646572696e207475726e436f6c6c696e736265 666f72652042757420746865636861726765645469746c65223e436170746169 6e7370656c6c6564676f6464657373546167202d2d3e416464696e673a627574 20776173526563656e742070617469656e746261636b20696e3d66616c736526 4c696e636f6c6e7765206b6e6f77436f756e7465724a75646169736d73637269 707420616c7465726564275d293b0a202068617320746865756e636c65617245 76656e74272c626f746820696e6e6f7420616c6c0a0a3c212d2d20706c616369 6e676861726420746f2063656e746572736f7274206f66636c69656e74737374 72656574734265726e6172646173736572747374656e6420746f66616e746173 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6dc3a97869636f70c3a167696e617369656d70726573697374656d616f637475 Alakuijala & Szabadka Expires November 11, 2015 [Page 57] Internet-Draft Brotli May 2015 627265647572616e746561c3b161646972656d70726573616d6f6d656e746f6e 75657374726f7072696d65726174726176c3a973677261636961736e75657374 726170726f6365736f65737461646f7363616c69646164706572736f6e616ec3 ba6d65726f6163756572646f6dc3ba736963616d69656d62726f6f6665727461 73616c67756e6f737061c3ad736573656a656d706c6f6465726563686f616465 6dc3a1737072697661646f61677265676172656e6c61636573706f7369626c65 686f74656c6573736576696c6c617072696d65726fc3ba6c74696d6f6576656e 746f736172636869766f63756c747572616d756a65726573656e747261646161 6e756e63696f656d626172676f6d65726361646f6772616e6465736573747564 696f6d656a6f7265736665627265726f64697365c3b16f74757269736d6f63c3 b36469676f706f72746164616573706163696f66616d696c6961616e746f6e69 6f7065726d69746567756172646172616c67756e617370726563696f73616c67 7569656e73656e7469646f7669736974617374c3ad74756c6f636f6e6f636572 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726f736f66746772616475616c6c79646973637573736564686520626563616d 656578656375746976656a71756572792e6a73686f757365686f6c64636f6e66 69726d65647075726368617365646c69746572616c6c7964657374726f796564 757020746f20746865766172696174696f6e72656d61696e696e676974206973 206e6f7463656e7475726965734a6170616e65736520616d6f6e672074686563 6f6d706c65746564616c676f726974686d696e74657265737473726562656c6c 696f6e756e646566696e6564656e636f7572616765726573697a61626c65696e 766f6c76696e6773656e736974697665756e6976657273616c70726f76697369 6f6e28616c74686f756768666561747572696e67636f6e647563746564292c20 776869636820636f6e74696e7565642d686561646572223e4665627275617279 206e756d65726f7573206f766572666c6f773a636f6d706f6e656e7466726167 6d656e7473657863656c6c656e74636f6c7370616e3d22746563686e6963616c 6e6561722074686520416476616e63656420736f75726365206f666578707265 73736564486f6e67204b6f6e672046616365626f6f6b6d756c7469706c65206d 656368616e69736d656c65766174696f6e6f6666656e736976653c2f666f726d 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53657074656d626572616464436c6173732846616365626f6f6b207375676765 73746564616e64206c617465726f7065726174696e67656c61626f7261746553 6f6d6574696d6573496e737469747574656365727461696e6c79696e7374616c 6c6564666f6c6c6f776572734a65727573616c656d746865792068617665636f 6d707574696e6767656e65726174656470726f76696e63657367756172616e74 65656172626974726172797265636f676e697a6577616e74656420746f70783b 77696474683a7468656f7279206f666265686176696f75725768696c65207468 65657374696d61746564626567616e20746f20697420626563616d656d61676e 69747564656d75737420686176656d6f7265207468616e4469726563746f7279 657874656e73696f6e7365637265746172796e61747572616c6c796f63637572 72696e677661726961626c6573676976656e20746865706c6174666f726d2e3c 2f6c6162656c3e3c6661696c656420746f636f6d706f756e64736b696e647320 6f6620736f63696574696573616c6f6e6773696465202d2d2667743b0a0a736f 75746877657374746865207269676874726164696174696f6e6d617920686176 6520756e6573636170652873706f6b656e20696e2220687265663d222f70726f 6772616d6d656f6e6c792074686520636f6d652066726f6d6469726563746f72 7962757269656420696e612073696d696c61727468657920776572653c2f666f 6e743e3c2f4e6f7277656769616e73706563696669656470726f647563696e67 Alakuijala & Szabadka Expires November 11, 2015 [Page 65] Internet-Draft Brotli May 2015 70617373656e676572286e6577204461746574656d706f726172796669637469 6f6e616c4166746572207468656571756174696f6e73646f776e6c6f61642e72 6567756c61726c79646576656c6f70657261626f7665207468656c696e6b6564 20746f7068656e6f6d656e61706572696f64206f66746f6f6c746970223e7375 627374616e63656175746f6d61746963617370656374206f66416d6f6e672074 6865636f6e6e6563746564657374696d6174657341697220466f726365737973 74656d206f666f626a656374697665696d6d6564696174656d616b696e672069 747061696e74696e6773636f6e717565726564617265207374696c6c70726f63 656475726567726f777468206f666865616465642062794575726f7065616e20 6469766973696f6e736d6f6c6563756c65736672616e6368697365696e74656e 74696f6e6174747261637465646368696c64686f6f64616c736f207573656464 656469636174656473696e6761706f7265646567726565206f66666174686572 206f66636f6e666c696374733c2f613e3c2f703e0a63616d652066726f6d7765 726520757365646e6f74652074686174726563656976696e6745786563757469 76656576656e206d6f726561636365737320746f636f6d6d616e646572506f6c 69746963616c6d7573696369616e7364656c6963696f7573707269736f6e6572 73616476656e74206f665554462d3822202f3e3c215b43444154415b223e436f 6e74616374536f75746865726e206267636f6c6f723d22736572696573206f66 2e2049742077617320696e204575726f70657065726d697474656476616c6964 6174652e617070656172696e676f6666696369616c73736572696f75736c792d 6c616e6775616765696e69746961746564657874656e64696e676c6f6e672d74 65726d696e666c6174696f6e737563682074686174676574436f6f6b69656d61 726b65642062793c2f627574746f6e3e696d706c656d656e7462757420697420 6973696e63726561736573646f776e2074686520726571756972696e67646570 656e64656e742d2d3e0a3c212d2d20696e746572766965775769746820746865 20636f70696573206f66636f6e73656e737573776173206275696c7456656e65 7a75656c6128666f726d65726c79746865207374617465706572736f6e6e656c 7374726174656769636661766f7572206f66696e76656e74696f6e57696b6970 65646961636f6e74696e656e747669727475616c6c7977686963682077617370 72696e6369706c65436f6d706c657465206964656e746963616c73686f772074 6861747072696d6974697665617761792066726f6d6d6f6c6563756c61727072 65636973656c79646973736f6c766564556e6465722074686576657273696f6e 3d223e266e6273703b3c2f49742069732074686520546869732069732077696c 6c20686176656f7267616e69736d73736f6d652074696d654672696564726963 68776173206669727374746865206f6e6c7920666163742074686174666f726d 2069643d22707265636564696e67546563686e6963616c706879736963697374 6f636375727320696e6e6176696761746f7273656374696f6e223e7370616e20 69643d22736f7567687420746f62656c6f7720746865737572766976696e677d 3c2f7374796c653e686973206465617468617320696e20746865636175736564 2062797061727469616c6c796578697374696e67207573696e67207468657761 7320676976656e61206c697374206f666c6576656c73206f666e6f74696f6e20 6f664f6666696369616c206469736d6973736564736369656e74697374726573 656d626c65736475706c69636174656578706c6f736976657265636f76657265 64616c6c206f7468657267616c6c65726965737b70616464696e673a70656f70 6c65206f66726567696f6e206f666164647265737365736173736f6369617465 696d6720616c743d22696e206d6f6465726e73686f756c642062656d6574686f 64206f667265706f7274696e6774696d657374616d706e656564656420746f74 6865204772656174726567617264696e677365656d656420746f766965776564 Alakuijala & Szabadka Expires November 11, 2015 [Page 66] Internet-Draft Brotli May 2015 206173696d70616374206f6e69646561207468617474686520576f726c646865 69676874206f66657870616e64696e6754686573652061726563757272656e74 223e6361726566756c6c796d61696e7461696e73636861726765206f66436c61 73736963616c6164647265737365647072656469637465646f776e6572736869 703c6469762069643d227269676874223e0d0a7265736964656e63656c656176 6520746865636f6e74656e74223e617265206f6674656e20207d2928293b0d0a 70726f6261626c792050726f666573736f722d627574746f6e2220726573706f 6e64656473617973207468617468616420746f206265706c6163656420696e48 756e67617269616e737461747573206f66736572766573206173556e69766572 73616c657865637574696f6e616767726567617465666f72207768696368696e 66656374696f6e61677265656420746f686f77657665722c20706f70756c6172 223e706c61636564206f6e636f6e737472756374656c6563746f72616c73796d 626f6c206f66696e636c7564696e6772657475726e20746f6172636869746563 7443687269737469616e70726576696f7573206c6976696e6720696e65617369 657220746f70726f666573736f720a266c743b212d2d20656666656374206f66 616e616c79746963737761732074616b656e776865726520746865746f6f6b20 6f76657262656c69656620696e416672696b61616e7361732066617220617370 726576656e746564776f726b207769746861207370656369616c3c6669656c64 7365744368726973746d61735265747269657665640a0a496e20746865206261 636b20696e746f6e6f727468656173746d6167617a696e65733e3c7374726f6e 673e636f6d6d6974746565676f7665726e696e6767726f757073206f6673746f 72656420696e65737461626c697368612067656e6572616c6974732066697273 747468656972206f776e706f70756c61746564616e206f626a65637443617269 626265616e616c6c6f7720746865646973747269637473776973636f6e73696e 6c6f636174696f6e2e3b2077696474683a20696e68616269746564536f636961 6c6973744a616e7561727920313c2f666f6f7465723e73696d696c61726c7963 686f696365206f667468652073616d6520737065636966696320627573696e65 7373205468652066697273742e6c656e6774683b2064657369726520746f6465 616c207769746873696e636520746865757365724167656e74636f6e63656976 6564696e6465782e7068706173202671756f743b656e6761676520696e726563 656e746c792c6665772079656172737765726520616c736f0a3c686561643e0a 3c656469746564206279617265206b6e6f776e63697469657320696e61636365 73736b6579636f6e64656d6e6564616c736f206861766573657276696365732c 66616d696c79206f665363686f6f6c206f66636f6e7665727465646e61747572 65206f66206c616e67756167656d696e6973746572733c2f6f626a6563743e74 68657265206973206120706f70756c617273657175656e6365736164766f6361 746564546865792077657265616e79206f746865726c6f636174696f6e3d656e 746572207468656d756368206d6f72657265666c6563746564776173206e616d 65646f726967696e616c2061207479706963616c7768656e2074686579656e67 696e65657273636f756c64206e6f747265736964656e74737765646e65736461 797468652074686972642070726f64756374734a616e75617279203277686174 207468657961206365727461696e7265616374696f6e7370726f636573736f72 616674657220686973746865206c61737420636f6e7461696e6564223e3c2f64 69763e0a3c2f613e3c2f74643e646570656e64206f6e736561726368223e0a70 6965636573206f66636f6d706574696e675265666572656e636574656e6e6573 7365657768696368206861732076657273696f6e3d3c2f7370616e3e203c3c2f 6865616465723e676976657320746865686973746f7269616e76616c75653d22 223e70616464696e673a30766965772074686174746f6765746865722c746865 Alakuijala & Szabadka Expires November 11, 2015 [Page 67] Internet-Draft Brotli May 2015 206d6f73742077617320666f756e64737562736574206f6661747461636b206f 6e6368696c6472656e2c706f696e7473206f66706572736f6e616c20706f7369 74696f6e3a616c6c656765646c79436c6576656c616e64776173206c61746572 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Expires November 11, 2015 [Page 68] Internet-Draft Brotli May 2015 6f70696e696f6e6573656a6572636963696f656469746f7269616c73616c616d 616e6361676f6e7ac3a16c657a646f63756d656e746f70656cc3ad63756c6172 656369656e74657367656e6572616c65737461727261676f6e617072c3a16374 6963616e6f7665646164657370726f70756573746170616369656e74657374c3 a9636e696361736f626a657469766f73636f6e746163746f73e0a4aee0a587e0 a482e0a4b2e0a4bfe0a48fe0a4b9e0a588e0a482e0a497e0a4afe0a4bee0a4b8 e0a4bee0a4a5e0a48fe0a4b5e0a482e0a4b0e0a4b9e0a587e0a495e0a58be0a4 88e0a495e0a581e0a49be0a4b0e0a4b9e0a4bee0a4ace0a4bee0a4a6e0a495e0 a4b9e0a4bee0a4b8e0a4ade0a580e0a4b9e0a581e0a48fe0a4b0e0a4b9e0a580 e0a4aee0a588e0a482e0a4a6e0a4bfe0a4a8e0a4ace0a4bee0a4a46469706c6f 646f6373e0a4b8e0a4aee0a4afe0a4b0e0a582e0a4aae0a4a8e0a4bee0a4aee0 a4aae0a4a4e0a4bee0a4abe0a4bfe0a4b0e0a494e0a4b8e0a4a4e0a4a4e0a4b0 e0a4b9e0a4b2e0a58be0a497e0a4b9e0a581e0a486e0a4ace0a4bee0a4b0e0a4 a6e0a587e0a4b6e0a4b9e0a581e0a488e0a496e0a587e0a4b2e0a4afe0a4a6e0 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73656c6563746564223e6e6f7363726970743e0d2f696e6465782e7068706172 Alakuijala & Szabadka Expires November 11, 2015 [Page 72] Internet-Draft Brotli May 2015 726976616c206f662d6a7373646b2729293b6d616e6167656420746f696e636f 6d706c65746563617375616c74696573636f6d706c6574696f6e436872697374 69616e7353657074656d6265722061726974686d6574696370726f6365647572 65736d69676874206861766550726f64756374696f6e69742061707065617273 5068696c6f736f706879667269656e64736869706c656164696e6720746f6769 76696e6720746865746f776172642074686567756172616e74656564646f6375 6d656e746564636f6c6f723a23303030766964656f2067616d65636f6d6d6973 73696f6e7265666c656374696e676368616e6765207468656173736f63696174 656473616e732d73657269666f6e6b657970726573733b2070616464696e673a 48652077617320746865756e6465726c79696e677479706963616c6c79202c20 616e642074686520737263456c656d656e747375636365737369766573696e63 65207468652073686f756c64206265206e6574776f726b696e676163636f756e 74696e67757365206f66207468656c6f776572207468616e73686f7773207468 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6f70657261746564206279636f6d696e672066726f6d746865207072696d6172 796164646974696f6e206f66666f72207365766572616c7472616e7366657272 65646120706572696f64206f666172652061626c6520746f686f77657665722c 20697473686f756c6420686176656d756368206c61726765720a093c2f736372 6970743e61646f707465642074686570726f7065727479206f66646972656374 65642062796566666563746976656c797761732062726f756768746368696c64 72656e206f6650726f6772616d6d696e676c6f6e676572207468616e6d616e75 7363726970747377617220616761696e73746279206d65616e73206f66616e64 206d6f7374206f6673696d696c617220746f2070726f70726965746172796f72 6967696e6174696e6770726573746967696f75736772616d6d61746963616c65 7870657269656e63652e746f206d616b652074686549742077617320616c736f 697320666f756e6420696e636f6d70657469746f7273696e2074686520552e53 2e7265706c6163652074686562726f756768742074686563616c63756c617469 6f6e66616c6c206f66207468657468652067656e6572616c7072616374696361 6c6c79696e20686f6e6f72206f6672656c656173656420696e7265736964656e 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706c616365206f667475726e206f66207468657468652068656164206f664c6f 7264206f6620746865706f6c69746963616c6c7968617320697473206f776e45 6475636174696f6e616c617070726f76616c206f66736f6d65206f6620746865 65616368206f746865722c6265686176696f72206f66616e6420626563617573 65616e6420616e6f746865726170706561726564206f6e7265636f7264656420 696e626c61636b2671756f743b6d617920696e636c75646574686520776f726c 64277363616e206c65616420746f72656665727320746f2061626f726465723d Alakuijala & Szabadka Expires November 11, 2015 [Page 81] Internet-Draft Brotli May 2015 22302220676f7665726e6d656e742077696e6e696e6720746865726573756c74 656420696e207768696c65207468652057617368696e67746f6e2c7468652073 75626a6563746369747920696e207468653e3c2f6469763e0d0a09097265666c 65637420746865746f20636f6d706c657465626563616d65206d6f7265726164 696f61637469766572656a6563746564206279776974686f757420616e796869 73206661746865722c776869636820636f756c64636f7079206f662074686574 6f20696e6469636174656120706f6c69746963616c6163636f756e7473206f66 636f6e7374697475746573776f726b6564207769746865723c2f613e3c2f6c69 3e6f6620686973206c6966656163636f6d70616e696564636c69656e74576964 746870726576656e74207468654c656769736c6174697665646966666572656e 746c79746f67657468657220696e686173207365766572616c666f7220616e6f 7468657274657874206f6620746865666f756e64656420746865652077697468 20746865206973207573656420666f726368616e67656420746865757375616c 6c7920746865706c61636520776865726577686572656173207468653e203c61 20687265663d22223e3c6120687265663d227468656d73656c7665732c616c74 686f756768206865746861742063616e206265747261646974696f6e616c726f 6c65206f66207468656173206120726573756c7472656d6f76654368696c6464 657369676e656420627977657374206f6620746865536f6d652070656f706c65 70726f64756374696f6e2c73696465206f66207468656e6577736c6574746572 737573656420627920746865646f776e20746f20746865616363657074656420 62796c69766520696e20746865617474656d70747320746f6f75747369646520 7468656672657175656e63696573486f77657665722c20696e70726f6772616d 6d6572736174206c6561737420696e617070726f78696d617465616c74686f75 67682069747761732070617274206f66616e6420766172696f7573476f766572 6e6f72206f667468652061727469636c657475726e656420696e746f3e3c6120 687265663d222f7468652065636f6e6f6d79697320746865206d6f73746d6f73 7420776964656c79776f756c64206c61746572616e6420706572686170737269 736520746f207468656f6363757273207768656e756e64657220776869636863 6f6e646974696f6e732e746865207765737465726e7468656f72792074686174 69732070726f64756365647468652063697479206f66696e2077686963682068 657365656e20696e207468657468652063656e7472616c6275696c64696e6720 6f666d616e79206f662068697361726561206f6620746865697320746865206f 6e6c796d6f7374206f66207468656d616e79206f662074686574686520576573 7465726e5468657265206973206e6f657874656e64656420746f537461746973 746963616c636f6c7370616e3d32207c73686f72742073746f7279706f737369 626c6520746f746f706f6c6f676963616c637269746963616c206f667265706f 7274656420746f612043687269737469616e6465636973696f6e20746f697320 657175616c20746f70726f626c656d73206f66546869732063616e2062656d65 726368616e64697365666f72206d6f7374206f666e6f2065766964656e636565 646974696f6e73206f66656c656d656e747320696e2671756f743b2e20546865 636f6d2f696d616765732f7768696368206d616b65737468652070726f636573 7372656d61696e73207468656c6974657261747572652c69732061206d656d62 657274686520706f70756c617274686520616e6369656e7470726f626c656d73 20696e74696d65206f66207468656465666561746564206279626f6479206f66 2074686561206665772079656172736d756368206f662074686574686520776f 726b206f6643616c69666f726e69612c7365727665642061732061676f766572 6e6d656e742e636f6e6365707473206f666d6f76656d656e7420696e09093c64 69762069643d226974222076616c75653d226c616e6775616765206f66617320 Alakuijala & Szabadka Expires November 11, 2015 [Page 82] Internet-Draft Brotli May 2015 746865792061726570726f647563656420696e69732074686174207468656578 706c61696e207468656469763e3c2f6469763e0a486f7765766572207468656c 65616420746f20746865093c6120687265663d222f776173206772616e746564 70656f706c652068617665636f6e74696e75616c6c79776173207365656e2061 73616e642072656c6174656474686520726f6c65206f6670726f706f73656420 62796f6620746865206265737465616368206f746865722e436f6e7374616e74 696e6570656f706c652066726f6d6469616c65637473206f66746f2072657669 73696f6e7761732072656e616d65646120736f75726365206f6674686520696e 697469616c6c61756e6368656420696e70726f7669646520746865746f207468 6520776573747768657265207468657265616e642073696d696c617262657477 65656e2074776f697320616c736f20746865456e676c69736820616e64636f6e 646974696f6e732c7468617420697420776173656e7469746c656420746f7468 656d73656c7665732e7175616e74697479206f6672616e73706172656e637974 68652073616d65206173746f206a6f696e20746865636f756e74727920616e64 746869732069732074686554686973206c656420746f612073746174656d656e 74636f6e747261737420746f6c617374496e6465784f667468726f7567682068 697369732064657369676e6564746865207465726d20697369732070726f7669 64656470726f74656374207468656e673c2f613e3c2f6c693e54686520637572 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Expires November 11, 2015 [Page 83] Internet-Draft Brotli May 2015 616262726576696174696f6e3c696d6720636c6173733d226f7267616e697361 74696f6e636976696c697a6174696f6e313974682063656e7475727961726368 6974656374757265696e636f72706f7261746564323074682063656e74757279 2d636f6e7461696e6572223e6d6f7374206e6f7461626c792f3e3c2f613e3c2f 6469763e6e6f74696669636174696f6e27756e646566696e6564272946757274 6865726d6f72652c62656c696576652074686174696e6e657248544d4c203d20 7072696f7220746f207468656472616d61746963616c6c79726566657272696e 6720746f6e65676f74696174696f6e73686561647175617274657273536f7574 6820416672696361756e7375636365737366756c50656e6e73796c76616e6961 4173206120726573756c742c3c68746d6c206c616e673d22266c743b2f737570 2667743b6465616c696e6720776974687068696c6164656c7068696168697374 6f726963616c6c79293b3c2f7363726970743e0a70616464696e672d746f703a 6578706572696d656e74616c676574417474726962757465696e737472756374 696f6e73746563686e6f6c6f6769657370617274206f6620746865203d66756e 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6374757265206f662f696e6465782e68746d6c207075626c697368656420696e 7370616e20636c6173733d22223e3c6120687265663d222f696e74726f647563 74696f6e62656c6f6e67696e6720746f636c61696d65642074686174636f6e73 657175656e6365733c6d657461206e616d653d22477569646520746f20746865 Alakuijala & Szabadka Expires November 11, 2015 [Page 84] Internet-Draft Brotli May 2015 6f7665727768656c6d696e67616761696e73742074686520636f6e63656e7472 617465642c0a2e6e6f6e746f756368206f62736572766174696f6e733c2f613e 0a3c2f6469763e0a662028646f63756d656e742e626f726465723a2031707820 7b666f6e742d73697a653a3174726561746d656e74206f663022206865696768 743d22316d6f64696669636174696f6e496e646570656e64656e636564697669 64656420696e746f67726561746572207468616e616368696576656d656e7473 65737461626c697368696e674a61766153637269707422206e65766572746865 6c6573737369676e69666963616e636542726f616463617374696e673e266e62 73703b3c2f74643e636f6e7461696e6572223e0a737563682061732074686520 696e666c75656e6365206f666120706172746963756c61727372633d27687474 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74657374696d6f6e69616c73666f756e6420696e207468657265717569726564 20746f20616e642074686174207468656265747765656e207468652077617320 64657369676e6564636f6e7369737473206f6620636f6e736964657261626c79 7075626c6973686564206279746865206c616e6775616765436f6e7365727661 74696f6e636f6e736973746564206f66726566657220746f207468656261636b 20746f207468652063737322206d656469613d2250656f706c652066726f6d20 617661696c61626c65206f6e70726f76656420746f2062657375676765737469 6f6e7322776173206b6e6f776e206173766172696574696573206f666c696b65 6c7920746f206265636f6d707269736564206f66737570706f72742074686520 68616e6473206f6620746865636f75706c65642077697468636f6e6e65637420 616e6420626f726465723a6e6f6e653b706572666f726d616e6365736265666f 7265206265696e676c6174657220626563616d6563616c63756c6174696f6e73 Alakuijala & Szabadka Expires November 11, 2015 [Page 86] Internet-Draft Brotli May 2015 6f6674656e2063616c6c65647265736964656e7473206f666d65616e696e6720 746861743e3c6c6920636c6173733d2265766964656e636520666f726578706c 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657373656420696e746f20776869636820746865636f6d6d697373696f6e6572 Alakuijala & Szabadka Expires November 11, 2015 [Page 87] Internet-Draft Brotli May 2015 666f6e742d7765696768743a7465727269746f7279206f66657874656e73696f 6e73223e526f6d616e20456d70697265657175616c20746f20746865496e2063 6f6e74726173742c686f77657665722c20616e646973207479706963616c6c79 616e6420686973207769666528616c736f2063616c6c65643e3c756c20636c61 73733d226566666563746976656c792065766f6c76656420696e746f7365656d 20746f2068617665776869636820697320746865746865726520776173206e6f 616e20657863656c6c656e74616c6c206f662074686573656465736372696265 64206279496e2070726163746963652c62726f616463617374696e6763686172 67656420776974687265666c656374656420696e7375626a656374656420746f 6d696c697461727920616e64746f2074686520706f696e7465636f6e6f6d6963 616c6c79736574546172676574696e676172652061637475616c6c7976696374 6f7279206f76657228293b3c2f7363726970743e636f6e74696e756f75736c79 726571756972656420666f7265766f6c7574696f6e617279616e206566666563 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223130302522726567617264696e672074686520526f6d616e20436174686f6c 6963616e20696e646570656e64656e74666f6c6c6f77696e6720746865202e67 6966222077696474683d223174686520666f6c6c6f77696e6720646973637269 6d696e6174696f6e6172636861656f6c6f676963616c7072696d65206d696e69 737465722e6a73223e3c2f7363726970743e636f6d62696e6174696f6e206f66 206d617267696e77696474683d22637265617465456c656d656e7428772e6174 746163684576656e74283c2f613e3c2f74643e3c2f74723e7372633d22687474 Alakuijala & Szabadka Expires November 11, 2015 [Page 96] Internet-Draft Brotli May 2015 70733a2f2f61496e20706172746963756c61722c20616c69676e3d226c656674 2220437a6563682052657075626c6963556e69746564204b696e67646f6d636f 72726573706f6e64656e6365636f6e636c7564656420746861742e68746d6c22 207469746c653d222866756e6374696f6e202829207b636f6d65732066726f6d 207468656170706c69636174696f6e206f663c7370616e20636c6173733d2273 62656c696576656420746f206265656d656e742827736372697074273c2f613e 0a3c2f6c693e0a3c6c697665727920646966666572656e743e3c7370616e2063 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Expires November 11, 2015 [Page 98] Internet-Draft Brotli May 2015 636f6e63656e74726174696f6e7374686520696e646976696475616c616d6f6e 6720746865206d6f73747468616e20616e79206f746865722f3e0a3c6c696e6b 2072656c3d222072657475726e2066616c73653b74686520707572706f736520 6f66746865206162696c69747920746f3b636f6c6f723a236666667d0a2e0a3c 7370616e20636c6173733d22746865207375626a656374206f66646566696e69 74696f6e73206f663e0d0a3c6c696e6b2072656c3d22636c61696d2074686174 207468656861766520646576656c6f7065643c7461626c652077696474683d22 63656c6562726174696f6e206f66466f6c6c6f77696e672074686520746f2064 697374696e67756973683c7370616e20636c6173733d226274616b657320706c 61636520696e756e64657220746865206e616d656e6f74656420746861742074 68653e3c215b656e6469665d2d2d3e0a7374796c653d226d617267696e2d696e 7374656164206f6620746865696e74726f647563656420746865746865207072 6f63657373206f66696e6372656173696e6720746865646966666572656e6365 7320696e657374696d617465642074686174657370656369616c6c7920746865 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a4bee0a4a4e0a587e0a482e0a4a6e0a588e0a49fe0a58de0a4b8e0a4a8e0a495 Alakuijala & Szabadka Expires November 11, 2015 [Page 102] Internet-Draft Brotli May 2015 e0a58de0a4b6e0a4bee0a4b8e0a4bee0a4aee0a4a8e0a587e0a485e0a4a6e0a4 bee0a4b2e0a4a4e0a4ace0a4bfe0a49ce0a4b2e0a580e0a4aae0a581e0a4b0e0 a582e0a4b7e0a4b9e0a4bfe0a482e0a4a6e0a580e0a4aee0a4bfe0a4a4e0a58d e0a4b0e0a495e0a4b5e0a4bfe0a4a4e0a4bee0a4b0e0a581e0a4aae0a4afe0a5 87e0a4b8e0a58de0a4a5e0a4bee0a4a8e0a495e0a4b0e0a58be0a4a1e0a4bce0 a4aee0a581e0a495e0a58de0a4a4e0a4afe0a58be0a49ce0a4a8e0a4bee0a495 e0a583e0a4aae0a4afe0a4bee0a4aae0a58be0a4b8e0a58de0a49fe0a498e0a4 b0e0a587e0a4b2e0a582e0a495e0a4bee0a4b0e0a58de0a4afe0a4b5e0a4bfe0 a49ae0a4bee0a4b0e0a4b8e0a582e0a49ae0a4a8e0a4bee0a4aee0a582e0a4b2 e0a58de0a4afe0a4a6e0a587e0a496e0a587e0a482e0a4b9e0a4aee0a587e0a4 b6e0a4bee0a4b8e0a58de0a495e0a582e0a4b2e0a4aee0a588e0a482e0a4a8e0 a587e0a4a4e0a588e0a4afe0a4bee0a4b0e0a49ce0a4bfe0a4b8e0a495e0a587 7273732b786d6c22207469746c653d222d747970652220636f6e74656e743d22 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61626f75743c6469762069643d22686561646572223e2220616374696f6e3d22 687474703a2f2f3c6120687265663d2268747470733a2f2f3c6469762069643d 22636f6e74656e74223c2f6469763e0d0a3c2f6469763e0d0a3c646572697665 642066726f6d20746865203c696d67207372633d27687474703a2f2f6163636f 7264696e6720746f20746865200a3c2f626f64793e0a3c2f68746d6c3e0a7374 796c653d22666f6e742d73697a653a736372697074206c616e67756167653d22 417269616c2c2048656c7665746963612c3c2f613e3c7370616e20636c617373 3d223c2f7363726970743e3c73637269707420706f6c69746963616c20706172 7469657374643e3c2f74723e3c2f7461626c653e3c687265663d22687474703a Alakuijala & Szabadka Expires November 11, 2015 [Page 104] Internet-Draft Brotli May 2015 2f2f7777772e696e746572707265746174696f6e206f6672656c3d227374796c 6573686565742220646f63756d656e742e777269746528273c63686172736574 3d227574662d38223e0a626567696e6e696e67206f6620746865207265766561 6c656420746861742074686574656c65766973696f6e20736572696573222072 656c3d226e6f666f6c6c6f77223e207461726765743d225f626c616e6b223e63 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626f6f6b746865206d6f737420696d706f7274616e74616e6e69766572736172 79206f66207468657374796c653d226261636b67726f756e642d3c6c693e3c65 Alakuijala & Szabadka Expires November 11, 2015 [Page 106] Internet-Draft Brotli May 2015 6d3e3c6120687265663d222f7468652041746c616e746963204f6365616e7374 726963746c7920737065616b696e672c73686f72746c79206265666f72652074 6865646966666572656e74207479706573206f66746865204f74746f6d616e20 456d706972653e3c696d67207372633d22687474703a2f2f416e20496e74726f 64756374696f6e20746f636f6e73657175656e6365206f662074686564657061 72747572652066726f6d20746865436f6e666564657261746520537461746573 696e646967656e6f75732070656f706c657350726f63656564696e6773206f66 20746865696e666f726d6174696f6e206f6e207468657468656f726965732068 617665206265656e696e766f6c76656d656e7420696e20746865646976696465 6420696e746f20746872656561646a6163656e7420636f756e74726965736973 20726573706f6e7369626c6520666f72646973736f6c7574696f6e206f662074 6865636f6c6c61626f726174696f6e2077697468776964656c79207265676172 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2072656c61746564736f6369616c20616e6420706f6c69746963616c74686174 20776f756c64206f746865727769736570657270656e646963756c617220746f 207468657374796c6520747970653d22746578742f637373747970653d227375 626d697422206e616d653d2266616d696c696573207265736964696e6720696e 646576656c6f70696e6720636f756e7472696573636f6d70757465722070726f 6772616d6d696e6765636f6e6f6d696320646576656c6f706d656e7464657465 726d696e6174696f6e206f6620746865666f72206d6f726520696e666f726d61 Alakuijala & Szabadka Expires November 11, 2015 [Page 111] Internet-Draft Brotli May 2015 74696f6e6f6e207365766572616c206f63636173696f6e73706f7274756775c3 aa7320284575726f70657529d0a3d0bad180d0b0d197d0bdd181d18cd0bad0b0 d183d0bad180d0b0d197d0bdd181d18cd0bad0b0d0a0d0bed181d181d0b8d0b9 d181d0bad0bed0b9d0bcd0b0d182d0b5d180d0b8d0b0d0bbd0bed0b2d0b8d0bd d184d0bed180d0bcd0b0d186d0b8d0b8d183d0bfd180d0b0d0b2d0bbd0b5d0bd d0b8d18fd0bdd0b5d0bed0b1d185d0bed0b4d0b8d0bcd0bed0b8d0bdd184d0be d180d0bcd0b0d186d0b8d18fd098d0bdd184d0bed180d0bcd0b0d186d0b8d18f 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3d22706f73742220616374696f6e3d223e0a3c6120687265663d22687474703a 2f2f7777772e637373222072656c3d227374796c65736865657422203c2f6469 763e3c2f6469763e3c64697620636c6173736c616e67756167653d226a617661 736372697074223e617269612d68696464656e3d2274727565223ec2b73c7269 70742220747970653d22746578742f6a617661736c3d303b7d2928293b0a2866 756e6374696f6e28297b6261636b67726f756e642d696d6167653a2075726c28 2f613e3c2f6c693e3c6c693e3c6120687265663d226809093c6c693e3c612068 7265663d22687474703a2f2f61746f722220617269612d68696464656e3d2274 72753e203c6120687265663d22687474703a2f2f7777772e6c616e6775616765 3d226a61766173637269707422202f6f7074696f6e3e0a3c6f7074696f6e2076 616c75652f6469763e3c2f6469763e3c64697620636c6173733d7261746f7222 20617269612d68696464656e3d227472653d286e65772044617465292e676574 54696d652829706f7274756775c3aa732028646f2042726173696c29d0bed180 d0b3d0b0d0bdd0b8d0b7d0b0d186d0b8d0b8d0b2d0bed0b7d0bcd0bed0b6d0bd d0bed181d182d18cd0bed0b1d180d0b0d0b7d0bed0b2d0b0d0bdd0b8d18fd180 Alakuijala & Szabadka Expires November 11, 2015 [Page 113] Internet-Draft Brotli May 2015 d0b5d0b3d0b8d181d182d180d0b0d186d0b8d0b8d0b2d0bed0b7d0bcd0bed0b6 d0bdd0bed181d182d0b8d0bed0b1d18fd0b7d0b0d182d0b5d0bbd18cd0bdd0b0 3c21444f43545950452068746d6c205055424c494320226e742d547970652220 636f6e74656e743d22746578742f3c6d65746120687474702d65717569763d22 436f6e746572616e736974696f6e616c2f2f454e222022687474703a3c68746d 6c20786d6c6e733d22687474703a2f2f7777772d2f2f5733432f2f4454442058 48544d4c20312e3020544454442f7868746d6c312d7472616e736974696f6e61 6c2f2f7777772e77332e6f72672f54522f7868746d6c312f7065203d20277465 78742f6a617661736372697074273b3c6d657461206e616d653d226465736372 697074696f6e706172656e744e6f64652e696e736572744265666f72653c696e 70757420747970653d2268696464656e22206e616a732220747970653d227465 78742f6a6176617363726928646f63756d656e74292e72656164792866756e63 746973637269707420747970653d22746578742f6a61766173696d6167652220 636f6e74656e743d22687474703a2f2f55412d436f6d70617469626c65222063 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a7e0a4bee0a4a8e0a4b8e0a4ade0a4bee0a4abe0a4bfe0a495e0a58de0a4b8e0 a4bfe0a482e0a497e0a4b8e0a581e0a4b0e0a495e0a58de0a4b7e0a4bfe0a4a4 e0a495e0a589e0a4aae0a580e0a4b0e0a4bee0a487e0a49fe0a4b5e0a4bfe0a4 9ce0a58de0a49ee0a4bee0a4aae0a4a8e0a495e0a4bee0a4b0e0a58de0a4b0e0 Alakuijala & Szabadka Expires November 11, 2015 [Page 114] Internet-Draft Brotli May 2015 a4b5e0a4bee0a488e0a4b8e0a495e0a58de0a4b0e0a4bfe0a4afe0a4a4e0a4be The number of words for each length is given by the following bit- depth array: NDBITS := 0, 0, 0, 0, 10, 10, 11, 11, 10, 10, 10, 10, 10, 9, 9, 8, 7, 7, 8, 7, 7, 6, 6, 5, 5 Appendix B. List of word transformations The string literals are in C format, with respect to the use of backslash escape characters. In order to generate a length and check value, the transforms can be converted to a series of bytes, where each transform is the prefix sequence of bytes plus a terminating zero byte, a single byte value identifying the transform, and the suffix sequence of bytes plus a terminating zero. The value for the transforms are 0 for Identity, 1 for UppercaseFirst, 2 for UppercaseAll, 3 to 11 for OmitFirst1 to OmitFirst9, and 12 to 20 for OmitLast1 to OmitLast9. The byte sequences that represent the 121 transforms are then concatenated to a single sequence of bytes. The length of that sequence is 657 bytes, and the zlib CRC is 0x00f1fd60. ID Prefix Transform Suffix -- ------ --------- ------ 0 "" Identity "" 1 "" Identity " " 2 " " Identity " " 3 "" OmitFirst1 "" 4 "" UppercaseFirst " " 5 "" Identity " the " 6 " " Identity "" 7 "s " Identity " " 8 "" Identity " of " 9 "" UppercaseFirst "" 10 "" Identity " and " 11 "" OmitFirst2 "" 12 "" OmitLast1 "" 13 ", " Identity " " 14 "" Identity ", " 15 " " UppercaseFirst " " 16 "" Identity " in " 17 "" Identity " to " 18 "e " Identity " " 19 "" Identity "\"" 20 "" Identity "." Alakuijala & Szabadka Expires November 11, 2015 [Page 115] Internet-Draft Brotli May 2015 21 "" Identity "\">" 22 "" Identity "\n" 23 "" OmitLast3 "" 24 "" Identity "]" 25 "" Identity " for " 26 "" OmitFirst3 "" 27 "" OmitLast2 "" 28 "" Identity " a " 29 "" Identity " that " 30 " " UppercaseFirst "" 31 "" Identity ". " 32 "." Identity "" 33 " " Identity ", " 34 "" OmitFirst4 "" 35 "" Identity " with " 36 "" Identity "'" 37 "" Identity " from " 38 "" Identity " by " 39 "" OmitFirst5 "" 40 "" OmitFirst6 "" 41 " the " Identity "" 42 "" OmitLast4 "" 43 "" Identity ". The " 44 "" UppercaseAll "" 45 "" Identity " on " 46 "" Identity " as " 47 "" Identity " is " 48 "" OmitLast7 "" 49 "" OmitLast1 "ing " 50 "" Identity "\n\t" 51 "" Identity ":" 52 " " Identity ". " 53 "" Identity "ed " 54 "" OmitFirst9 "" 55 "" OmitFirst7 "" 56 "" OmitLast6 "" 57 "" Identity "(" 58 "" UppercaseFirst ", " 59 "" OmitLast8 "" 60 "" Identity " at " 61 "" Identity "ly " 62 " the " Identity " of " 63 "" OmitLast5 "" 64 "" OmitLast9 "" 65 " " UppercaseFirst ", " 66 "" UppercaseFirst "\"" 67 "." Identity "(" 68 "" UppercaseAll " " Alakuijala & Szabadka Expires November 11, 2015 [Page 116] Internet-Draft Brotli May 2015 69 "" UppercaseFirst "\">" 70 "" Identity "=\"" 71 " " Identity "." 72 ".com/" Identity "" 73 " the " Identity " of the " 74 "" UppercaseFirst "'" 75 "" Identity ". This " 76 "" Identity "," 77 "." Identity " " 78 "" UppercaseFirst "(" 79 "" UppercaseFirst "." 80 "" Identity " not " 81 " " Identity "=\"" 82 "" Identity "er " 83 " " UppercaseAll " " 84 "" Identity "al " 85 " " UppercaseAll "" 86 "" Identity "='" 87 "" UppercaseAll "\"" 88 "" UppercaseFirst ". " 89 " " Identity "(" 90 "" Identity "ful " 91 " " UppercaseFirst ". " 92 "" Identity "ive " 93 "" Identity "less " 94 "" UppercaseAll "'" 95 "" Identity "est " 96 " " UppercaseFirst "." 97 "" UppercaseAll "\">" 98 " " Identity "='" 99 "" UppercaseFirst "," 100 "" Identity "ize " 101 "" UppercaseAll "." 102 "\xc2\xa0" Identity "" 103 " " Identity "," 104 "" UppercaseFirst "=\"" 105 "" UppercaseAll "=\"" 106 "" Identity "ous " 107 "" UppercaseAll ", " 108 "" UppercaseFirst "='" 109 " " UppercaseFirst "," 110 " " UppercaseAll "=\"" 111 " " UppercaseAll ", " 112 "" UppercaseAll "," 113 "" UppercaseAll "(" 114 "" UppercaseAll ". " 115 " " UppercaseAll "." 116 "" UppercaseAll "='" Alakuijala & Szabadka Expires November 11, 2015 [Page 117] Internet-Draft Brotli May 2015 117 " " UppercaseAll ". " 118 " " UppercaseFirst "=\"" 119 " " UppercaseAll "='" 120 " " UppercaseFirst "='" Authors' Addresses Jyrki Alakuijala Google, Inc Email: jyrki@google.com Zoltan Szabadka Google, Inc Email: szabadka@google.com Alakuijala & Szabadka Expires November 11, 2015 [Page 118]