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Network Working Group J. Alakuijala
Internet-Draft Z. Szabadka
Intended Status: Informational Google, Inc
Expires: April 6, 2016 October 2015
Brotli Compressed Data Format
draft-alakuijala-brotli-07
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 April 6, 2016.
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.
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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 . . . . . . . . . . . . . . . . . . . . 16
5. Encoding of literal insertion lengths and copy lengths . . . . 17
6. Encoding of block switch commands . . . . . . . . . . . . . . 20
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 . . . . . . . . . . . . . . 31
10. Decoding algorithm . . . . . . . . . . . . . . . . . . . . . 32
11. Security Considerations . . . . . . . . . . . . . . . . . . . 34
12. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 35
13. Informative References . . . . . . . . . . . . . . . . . . . 35
14. Source code . . . . . . . . . . . . . . . . . . . . . . . . . 35
15. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 35
Appendix A. Static dictionary data . . . . . . . . . . . . . . . 36
Appendix B. List of word transformations . . . . . . . . . . . . 116
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 119
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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
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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
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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 0 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 10 to 24. The possible sliding window sizes range from 1 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.
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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
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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
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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
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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
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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:
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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:
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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 parameters defined in later sections. The following table
summarizes the alphabet sizes for the various prefix codes and the
sections where they are defined.
+-----------------+------------------------+-------------+
| Prefix code | Alphabet size | Definition |
+-----------------+------------------------+-------------+
| literal | 256 | |
+-----------------+------------------------+-------------+
| distance | 16 + NDIRECT + | Section 4. |
| | (48 << NPOSTFIX) | |
+-----------------+------------------------+-------------+
| insert-and-copy | 704 | Section 5. |
| length | | |
+-----------------+------------------------+-------------+
| block count | 26 | Section 6. |
+-----------------+------------------------+-------------+
| block type | NBLTYPESx + 2, | Section 6. |
| | (where x is I, L or D) | |
+-----------------+------------------------+-------------+
| context map | NTREESx + RLEMAXx | Section 7. |
| | (where x is L or D) | |
+-----------------+------------------------+-------------+
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
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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
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
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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:
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 variable length code (as it appears in
the compressed data, where the bits are parsed from right to left):
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Symbol Code
------ ----
0 00
1 0111
2 011
3 10
4 01
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 variable length code above. A code length of 0 means
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.
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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. If the number of times to repeat the previous length
or repeat a zero length would result in more lengths in
total than the number of symbols in the alphabet, then the
stream should be rejected as invalid.
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.
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
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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
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
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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:
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:
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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:
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).
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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,
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. If a block type
has a value outside its respective range, the stream should be
rejected as invalid. 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
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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
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:
* LSB6, where the Context ID is the value of six least
significant bits of p1,
* MSB6, where the Context ID is the value of six most
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.
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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,
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,
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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
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 *
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NBLTYPESL - 1)] and CMAPD[0..(4 * NBLTYPESD - 1)].
The index of the prefix code for encoding a literal or distance code
with context ID, CIDx, and block type, BTYPE_x, is:
index of literal prefix code = CMAPL[64 * BTYPE_L + CIDL]
index of distance prefix code = CMAPD[4 * BTYPE_D + CIDD]
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
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. If a run length
would result in more lengths in total than the size of
the context map, then the stream should be rejected as
invalid.
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
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Note that RLEMAX may be larger than the value necessary to represent
the longest sequence of zero values.
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;
}
}
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 copy length for a static dictionary
reference must be between 4 and 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:
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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
the transformation to the base dictionary word. If transform_id is
greater than 120 or length is smaller than 4 or greater than 24, then
the compressed stream should be rejected as 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, UppercaseFirst, UppercaseAll,
OmitFirst1, ..., OmitFirst9, OmitLast1, ..., OmitLast9
The form of these elementary transforms are as follows:
Identity(word) = word
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
OmitLastk(word) = the first (length(word) - k) bytes of word, or
empty string if length(word) < k
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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
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
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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:
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, if set to 1, the 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 with the following fixed length code:
Value Bit Pattern
----- -----------
0 11
4 00
5 01
6 10
If MNIBBLES is 0, the meta-block is empty, i.e. it does
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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
MNIBBLES is greater than 4, and the last
nibble is all zeros, then the stream should be
rejected as invalid)
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
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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
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
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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
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
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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 the
uncompressed bytes produced (i.e. the number of literals inserted
plus the number of bytes copied from past data or generated from the
static dictionary) over all the commands gives the uncompressed
length, MLEN encoded in the meta-block header.
If the total number of uncompressed bytes produced after the insert
part of the last command equals MLEN, then the copy length of the
last command is ignored and will not produce any uncompressed output.
In this case the copy length of the last command can have any value.
In any other case, if the number of literals to insert, the copy
length, or the resulting dictionary word length would cause MLEN to
be exceeded, then the stream should be rejected as invalid.
If the last command of the last non-empty meta-block does not end on
a byte boundary, the unused bits in the last byte must be zeros.
10. Decoding algorithm
The decoding algorithm that produces the uncompressed data is as
follows:
read window size
do
read ISLAST bit
if ISLAST
read ISLASTEMPTY bit
if ISLASTEMPTY
break from loop
read MNIBBLES
if MNIBBLES is zero
verify reserved bit is zero
read MSKIPLEN
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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
read block count using HTREE_BLEN_I and set BLEN_I
decrement BLEN_I
read insert and copy length, ILEN, CLEN using 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
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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 using 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
If the stream ends before the completion of the last meta-block, then
the stream should be rejected as invalid.
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
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
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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
The "HTTP Content Coding Registry" has been updated with the
registration below:
+----------+----------------------------------------+---------------+
| Name | Description | Reference |
+----------+----------------------------------------+---------------+
| br | Brotli Compressed Data Format | RFCXXXX |
+----------+----------------------------------------+---------------+
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. Acknowledgments
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.
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Appendix A. Static dictionary data
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.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3138707863616d6568696c6c626f6c647a6f6f6d766f69646561737972696e67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6d696c657279616e756e697864697363293b7d0a64757374636c6970292e0a0a
373070782d32303044564473375d3e3c7461706564656d6f692b2b2977616765
6575726f7068696c6f707473686f6c65464151736173696e2d3236546c616273
7065747355524c2062756c6b636f6f6b3b7d0d0a484541445b305d2961626272
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d8a8d987d984d988d984d98ad8a8d984d8a7d98ad8a8d983d8b4d98ad8a7d985
d8a3d985d986d8aad8a8d98ad984d986d8add8a8d987d985d985d8b4d988d8b4
6669727374766964656f6c69676874776f726c646d656469617768697465636c
6f7365626c61636b7269676874736d616c6c626f6f6b73706c6163656d757369
636669656c646f72646572706f696e7476616c75656c6576656c7461626c6562
6f617264686f75736567726f7570776f726b7379656172737374617465746f64
6179776174657273746172747374796c656465617468706f77657270686f6e65
6e696768746572726f72696e70757461626f75747465726d737469746c65746f
6f6c736576656e746c6f63616c74696d65736c61726765776f72647367616d65
7373686f72747370616365666f637573636c6561726d6f64656c626c6f636b67
75696465726164696f7368617265776f6d656e616761696e6d6f6e6579696d61
67656e616d6573796f756e676c696e65736c61746572636f6c6f72677265656e
Alakuijala & Szabadka Expires April 6, 2016 [Page 38]
Internet-Draft Brotli October 2015
66726f6e7426616d703b7761746368666f726365707269636572756c65736265
67696e616674657276697369746973737565617265617362656c6f77696e6465
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6c616e65736d617274616c706861706c616e746d61726b737261746573706c61
7973636c61696d73616c65737465787473737461727377726f6e673c2f68333e
7468696e672e6f72672f6d756c74696865617264506f7765727374616e64746f
6b656e736f6c696428746869736272696e677368697073737461666674726965
6463616c6c7366756c6c7966616374736167656e7454686973202f2f2d2d3e61
646d696e65677970744576656e74313570783b456d61696c747275652263726f
73737370656e74626c6f6773626f78223e6e6f7465646c656176656368696e61
73697a657367756573743c2f68343e726f626f746865617679747275652c7365
76656e6772616e646372696d657369676e73617761726564616e636570686173
653e3c212d2d656e5f5553262333393b32303070785f6e616d656c6174696e65
Alakuijala & Szabadka Expires April 6, 2016 [Page 39]
Internet-Draft Brotli October 2015
6e6a6f79616a61782e6174696f6e736d697468552e532e20686f6c6473706574
6572696e6469616e6176223e636861696e73636f7265636f6d6573646f696e67
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65726672616e6b436c617373323870783b66656564733c68313e3c73636f7474
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33393b20666f72206c6f7665647761737465303070783b6a613ae38273696d6f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 & Szabadka Expires April 6, 2016 [Page 40]
Internet-Draft Brotli October 2015
69636568617272793132302220737765657474723e0d0a6e616d653d64696567
6f706167652073776973732d2d3e0a0a236666663b223e4c6f672e636f6d2274
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616265726573746f796e756e63616d756a657276616c6f7266756572616c6962
726f6775737461696775616c766f746f736361736f736775c3ad61707565646f
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756e746f7472617461766973746f637265617263616d706f68656d6f7363696e
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61726f6a6f72676563616c6c65706f6e657274617264656e616469656d617263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 & Szabadka Expires April 6, 2016 [Page 41]
Internet-Draft Brotli October 2015
617376616c6c65616c6cc3a16361726761646f6c6f726162616a6f657374c3a9
677573746f6d656e74656d6172696f6669726d61636f73746f6669636861706c
617461686f67617261727465736c65796573617175656c6d7573656f62617365
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6368616e6765726573756c747075626c696373637265656e63686f6f73656e6f
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Alakuijala & Szabadka Expires April 6, 2016 [Page 42]
Internet-Draft Brotli October 2015
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Alakuijala & Szabadka Expires April 6, 2016 [Page 43]
Internet-Draft Brotli October 2015
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Alakuijala & Szabadka Expires April 6, 2016 [Page 44]
Internet-Draft Brotli October 2015
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Alakuijala & Szabadka Expires April 6, 2016 [Page 45]
Internet-Draft Brotli October 2015
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Alakuijala & Szabadka Expires April 6, 2016 [Page 46]
Internet-Draft Brotli October 2015
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Alakuijala & Szabadka Expires April 6, 2016 [Page 47]
Internet-Draft Brotli October 2015
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Alakuijala & Szabadka Expires April 6, 2016 [Page 48]
Internet-Draft Brotli October 2015
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Alakuijala & Szabadka Expires April 6, 2016 [Page 49]
Internet-Draft Brotli October 2015
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756e746572696e697469616c7265706f727473666967757265736d656d626572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 & Szabadka Expires April 6, 2016 [Page 50]
Internet-Draft Brotli October 2015
7761726e696e67436f6c6c656765746f6f6c62617272656d61696e7362656361
757365656c65637465644465757473636866696e616e6365776f726b65727371
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6d3e696e636c75646577686574686572646566696e6564536369656e63656361
74616c6f6741727469636c65627574746f6e736c617267657374756e69666f72
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61636b206f66747269627574654972656c616e642220646174612d666163746f
727372656365697665746861742069734c69627261727968757362616e64696e
206661637461666661697273436861726c65737261646963616c62726f756768
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45646974696f6e5d2671756f743b4d6573736167656e65656420746f76616c75
653d22636f6d706c65786c6f6f6b696e6773746174696f6e62656c6965766573
6d616c6c65722d6d6f62696c657265636f72647377616e7420746f6b696e6420
6f6646697265666f78796f752061726573696d696c6172737475646965646d61
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65636f6e6f6d79526573756c747362726f74686572736f6c646965726c617267
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6d6f726e696e6773656c6c696e67697320757365647265766572736576617269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 & Szabadka Expires April 6, 2016 [Page 51]
Internet-Draft Brotli October 2015
676573745f6865616465727369676e696e672e68746d6c223e736574746c6564
7765737465726e63617573696e672d7765626b6974636c61696d65644a757374
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68656e0a0a5768656e206f6273657276653c2f68323e0d0a4d6f6465726e2070
726f766964652220616c743d22626f72646572732e0a0a466f72200a0a4d616e
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7065206f666d65646963616c7469636b6574736f70706f736564436f756e6369
6c7769746e6573736a75737469636547656f7267652042656c6769756d2e2e2e
3c2f613e747769747465726e6f7461626c7977616974696e6777617266617265
204f746865722072616e6b696e67706872617365736d656e74696f6e73757276
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3e3c73746f7070656431275d293b0d0a69736c616e64736e6f7461626c65626f
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68746d6c6d6f6e617263686f66662074686574656163686572686967686c7920
62696f6c6f67796c696665206f666f72206576656e72697365206f6626726171
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616d76656869636c65737563682061736372797374616c76616c7565203d5769
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22666f726569676e20416c6c207269686f7720746865446973706c6179726574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 & Szabadka Expires April 6, 2016 [Page 52]
Internet-Draft Brotli October 2015
747265666f726d73627574746f6e2077686f207761736c656374757265696e73
74616e747375696369646567656e65726963706572696f64736d61726b657473
536f6369616c2066697368696e67636f6d62696e656772617068696377696e6e
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61746564656772656573736f757263653d52696368617264636c6f73656c7970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69732069732e737263203d20636172746f6f6e72656769737472436f6d6d6f6e
734d75736c696d7357686174206973696e206d616e796d61726b696e67726576
65616c73496e646565642c657175616c6c792f73686f775f616f7574646f6f72
657363617065284175737472696167656e6574696373797374656d2c496e2074
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09093c212d2d44616e69656c2062696e64696e67626c6f636b223e696d706f73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 & Szabadka Expires April 6, 2016 [Page 53]
Internet-Draft Brotli October 2015
6e2e6a733f617265207468656b6f6e74616b74746f64617927732e68746d6c22
207461726765743d77656172696e67416c6c205269673b0a7d2928293b726169
73696e6720416c736f2c206372756369616c61626f7574223e6465636c617265
2d2d3e0a3c736366697265666f786173206d7563686170706c696573696e6465
782c20732c206275742074797065203d200a0d0a3c212d2d746f776172647352
65636f72647350726976617465466f726569676e5072656d69657263686f6963
65735669727475616c72657475726e73436f6d6d656e74506f7765726564696e
6c696e653b706f76657274796368616d6265724c6976696e6720766f6c756d65
73416e74686f6e796c6f67696e222052656c6174656445636f6e6f6d79726561
6368657363757474696e67677261766974796c69666520696e43686170746572
2d736861646f774e6f7461626c653c2f74643e0d0a2072657475726e73746164
69756d7769646765747376617279696e6774726176656c7368656c6420627977
686f20617265776f726b20696e666163756c7479616e67756c617277686f2068
6164616972706f7274746f776e206f660a0a536f6d652027636c69636b276368
61726765736b6579776f726469742077696c6c63697479206f66287468697329
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68657273656c6653746174696f6e4665646572616c76656e747572657075626c
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696e6765727344756b65206f6670656f706c652c6578706c6f69747768617420
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6e75223e0a6d6f6e74686c796f666669636572636f756e63696c6761696e696e
676576656e20696e53756d6d61727964617465206f666c6f79616c7479666974
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616c67726f756e6473292c20616e642070657263656e7469742066726f6d636c
6f73696e67636f6e7461696e496e73746561646669667465656e61732077656c
6c2e7961686f6f2e726573706f6e64666967687465726f627363757265726566
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70616464696e67612077686f6c656f6e6572726f7279656172206f66656e6420
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6573756d656472656e616d65647374726f6e673e68656174696e677265746169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 & Szabadka Expires April 6, 2016 [Page 54]
Internet-Draft Brotli October 2015
652028747970656f666f6e652063616e636f6c6f72203d737065616b65726578
74656e6473506879736963737465727261696e3c74626f64793e66756e657261
6c76696577696e676d6964646c6520637269636b657470726f70686574736869
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616c6765627261736f6369616c2d62756c6b206f666d616e20616e643c2f7464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6f6d62696e676d61696c746f3a6d61646520696e2e204d616e79206361727269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 & Szabadka Expires April 6, 2016 [Page 55]
Internet-Draft Brotli October 2015
616b652069744b6f6e74616b74416e746f6e696f686176696e6720726174696e
67732061637469766573747265616d737472617070656422292e63737328686f
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652d2d3e0d0a0d0a20726f77733d22206f626a656374696e76657273653c666f
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75727365736120746869726464656e6f746573616c736f20696e486f7573746f
6e323070783b223e61636375736564646f75626c6520676f616c206f6646616d
6f757320292e62696e642870726965737473204f6e6c696e65696e204a756c79
7374202b202267636f6e73756c74646563696d616c68656c7066756c72657669
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65203c6f626a656374666f7263696e67537472696e672822202f3e0a09096865
7265206973656e636f6465642e20205468652062616c6c6f6f6e646f6e652062
792f636f6d6d6f6e6267636f6c6f726c6177206f6620496e6469616e6161766f
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706f6c6963792e6d656e20616e64666f6f7465722d3d20747275653b666f7220
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61736e6f7469636564766965776572737d2928293b0a206973206d6f72657365
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616c204d697373696f6e50726573732c206f6e746172696f6368617273657474
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737461206d6f726520746f74616c6c7966616c6c206f667d293b0d0a2020696d
6d656e736574696d6520696e736574206f757473617469736679746f2066696e
64646f776e20746f6c6f74206f6620506c6179657273696e204a756e65717561
6e74756d6e6f742074686574696d6520746f64697374616e7446696e6e697368
737263203d202873696e676c652068656c70206f664765726d616e206c617720
616e646c6162656c6564666f7265737473636f6f6b696e677370616365223e68
65616465722d77656c6c2061735374616e6c6579627269646765732f676c6f62
616c43726f617469612041626f7574205b305d3b0a202069742c20616e646772
6f757065646265696e672061297b7468726f776865206d6164656c6967687465
726574686963616c46464646464622626f74746f6d226c696b65206120656d70
6c6f79736c69766520696e6173207365656e7072696e7465726d6f7374206f66
75622d6c696e6b72656a65637473616e6420757365696d616765223e73756363
Alakuijala & Szabadka Expires April 6, 2016 [Page 56]
Internet-Draft Brotli October 2015
65656466656564696e674e75636c656172696e666f726d61746f2068656c7057
6f6d656e27734e6569746865724d65786963616e70726f7465696e3c7461626c
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726f706f7365746f2073686f7763656e7465723b6d6164652069746472657373
65647765726520696e6d6978747572657072656369736561726973696e677372
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616374696e67207269676874223e746f20776f726b7265647563657368617320
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6e20617265613d3d20226874743c6865616465720a3c68746d6c3e636f6e666f
726d666163696e6720636f6f6b69652e72656c79206f6e686f73746564202e63
7573746f6d68652077656e7462757420666f727370726561642046616d696c79
2061206d65616e736f757420746865666f72756d732e666f6f74616765223e4d
6f62696c436c656d656e7473222069643d2261732068696768696e74656e7365
2d2d3e3c212d2d66656d616c65206973207365656e696d706c69656473657420
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732c6120796f756e67616e64206172654e617469766520636865617065725469
6d656f7574616e6420686173656e67696e6573776f6e20746865286d6f73746c
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61206f666d6f7265206f667365617263685f6e61747572652c6c6567616c6c79
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696e676d697373696c656c6f63616c6c79416761696e7374746865207761796b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 & Szabadka Expires April 6, 2016 [Page 57]
Internet-Draft Brotli October 2015
536565207468656e6174697665736279207468697373797374656d2e68656164
206f663a686f7665722c6c65736269616e7375726e616d65616e6420616c6c63
6f6d6d6f6e2f6865616465725f5f706172616d73486172766172642f70697865
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7973637261556e69636f64656272202f3e0d0a41746c616e74616e75636c6575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 & Szabadka Expires April 6, 2016 [Page 58]
Internet-Draft Brotli October 2015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 & Szabadka Expires April 6, 2016 [Page 59]
Internet-Draft Brotli October 2015
636f6e666c6963746861726477617265696e74657265737464656c6976657279
6d6f756e7461696e6f627461696e65643d2066616c73653b666f722876617220
61636365707465646361706163697479636f6d70757465726964656e74697479
6169726372616674656d706c6f79656470726f706f736564646f6d6573746963
696e636c7564657370726f7669646564686f73706974616c766572746963616c
636f6c6c61707365617070726f616368706172746e6572736c6f676f223e3c61
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707572706f7365737265717569726573656c656374696f6e6265636f6d696e67
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3a202671756f743b657874656e64656470726576696f7573536f667477617265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 & Szabadka Expires April 6, 2016 [Page 60]
Internet-Draft Brotli October 2015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68616e646c696e676469762069643d2257696c6c69616d2070726f7669646572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 & Szabadka Expires April 6, 2016 [Page 61]
Internet-Draft Brotli October 2015
63616d6520746f20646973706c61797373636f74746973686a6f6e617468616e
6d616a6f72697479776964676574732e636c696e6963616c746861696c616e64
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7365617263682220616e64726f696422717569636b6c79206d656574696e6773
657374696d6174653b72657475726e203b636f6c6f723a23206865696768743d
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73706f7274696e67746f703a317078202e3c2f7370616e3e74656e73696f6e73
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6865696768743a322f70726f64756374636f756e74727920696e636c75646520
666f6f7465722220266c743b212d2d207469746c65223e3c2f6a71756572792e
3c2f666f726d3e0a28e7ae80e4bd932928e7b981e9ab94296872766174736b69
6974616c69616e6f726f6dc3a26ec48374c3bc726bc3a765d8a7d8b1d8afd988
74616d6269c3a96e6e6f7469636961736d656e73616a6573706572736f6e6173
6465726563686f736e6163696f6e616c736572766963696f636f6e746163746f
Alakuijala & Szabadka Expires April 6, 2016 [Page 62]
Internet-Draft Brotli October 2015
7573756172696f7370726f6772616d61676f626965726e6f656d707265736173
616e756e63696f7376616c656e636961636f6c6f6d6269616465737075c3a973
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666163746f726573736567756e646f737065717565c3b161d0b3d0bed0b4d0b0
d0b5d181d0bbd0b8d0b5d181d182d18cd0b1d18bd0bbd0bed0b1d18bd182d18c
d18dd182d0bed0bcd095d181d0bbd0b8d182d0bed0b3d0bed0bcd0b5d0bdd18f
d0b2d181d0b5d185d18dd182d0bed0b9d0b4d0b0d0b6d0b5d0b1d18bd0bbd0b8
d0b3d0bed0b4d183d0b4d0b5d0bdd18cd18dd182d0bed182d0b1d18bd0bbd0b0
d181d0b5d0b1d18fd0bed0b4d0b8d0bdd181d0b5d0b1d0b5d0bdd0b0d0b4d0be
d181d0b0d0b9d182d184d0bed182d0bed0bdd0b5d0b3d0bed181d0b2d0bed0b8
d181d0b2d0bed0b9d0b8d0b3d180d18bd182d0bed0b6d0b5d0b2d181d0b5d0bc
d181d0b2d0bed18ed0bbd0b8d188d18cd18dd182d0b8d185d0bfd0bed0bad0b0
Alakuijala & Szabadka Expires April 6, 2016 [Page 63]
Internet-Draft Brotli October 2015
d0b4d0bdd0b5d0b9d0b4d0bed0bcd0b0d0bcd0b8d180d0b0d0bbd0b8d0b1d0be
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696e67636f6e7461696e6572646972656374696f6e7375627363726962656164
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6e6368616c6c656e6765646576656c6f706564616e6f6e796d6f757366756e63
74696f6e2066756e6374696f6e73636f6d70616e696573737472756374757265
61677265656d656e7422207469746c653d22706f74656e7469616c6564756361
Alakuijala & Szabadka Expires April 6, 2016 [Page 64]
Internet-Draft Brotli October 2015
74696f6e617267756d656e74737365636f6e64617279636f707972696768746c
616e6775616765736578636c7573697665636f6e646974696f6e3c2f666f726d
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6861746974206d6179206265456e676c6973683c2f66726f6d20746865207363
Alakuijala & Szabadka Expires April 6, 2016 [Page 65]
Internet-Draft Brotli October 2015
686564756c6564646f776e6c6f6164733c2f6c6162656c3e0a73757370656374
65646d617267696e3a203073706972697475616c3c2f686561643e0a0a6d6963
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69747564656d75737420686176656d6f7265207468616e4469726563746f7279
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2f6c6162656c3e3c6661696c656420746f636f6d706f756e64736b696e647320
6f6620736f63696574696573616c6f6e6773696465202d2d2667743b0a0a736f
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6772616d6d656f6e6c792074686520636f6d652066726f6d6469726563746f72
Alakuijala & Szabadka Expires April 6, 2016 [Page 66]
Internet-Draft Brotli October 2015
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69643d22736f7567687420746f62656c6f7720746865737572766976696e677d
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696d6720616c743d22696e206d6f6465726e73686f756c642062656d6574686f
Alakuijala & Szabadka Expires April 6, 2016 [Page 67]
Internet-Draft Brotli October 2015
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207468657961206365727461696e7265616374696f6e7370726f636573736f72
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7365657768696368206861732076657273696f6e3d3c2f7370616e3e203c3c2f
Alakuijala & Szabadka Expires April 6, 2016 [Page 68]
Internet-Draft Brotli October 2015
6865616465723e676976657320746865686973746f7269616e76616c75653d22
223e70616464696e673a30766965772074686174746f6765746865722c746865
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63696f6e6573726573756c7461646f636172c3a16374657270726f7069656461
Alakuijala & Szabadka Expires April 6, 2016 [Page 69]
Internet-Draft Brotli October 2015
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63617465676f72696573657870657269656e63653c2f7469746c653e0d0a436f
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2220746563686e697175657370726f74656374696f6e6170706172656e746c79
Alakuijala & Szabadka Expires April 6, 2016 [Page 70]
Internet-Draft Brotli October 2015
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65726174696f6e7374656c65766973696f6e7472616e736c6174656457617368
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20636f6c7370616e3d223c2f666f726d3e0a2020636f6e76657273696f6e6162
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6e673d22656e506f727475677565736573756273746974757465696e64697669
Alakuijala & Szabadka Expires April 6, 2016 [Page 71]
Internet-Draft Brotli October 2015
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6c6c707820736f6c6964202361706172742066726f6d7375626a65637420746f
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706572666f726d696e67657874656e73696f6e736d6179206e6f74206265636f
Alakuijala & Szabadka Expires April 6, 2016 [Page 72]
Internet-Draft Brotli October 2015
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6e6369616c206d616b696e67207468654c7578656d626f757267616464697469
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72736d7973746572696f75734465706172746d656e7462657374206b6e6f776e
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3c2f6469763e636c656172666978223e746865207075626c69636d616e792079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 & Szabadka Expires April 6, 2016 [Page 73]
Internet-Draft Brotli October 2015
6d73726561736f6e61626c65506f70756c6174696f6e436f6c6c656374696f6e
73656c6563746564223e6e6f7363726970743e0d2f696e6465782e7068706172
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656374206f6670617373656e67657273706f7373657373696f6e2e0a0a496e20
746865204265666f7265207468656166746572776172647363757272656e746c
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6e74657220666f7270726f6d696e656e63657265616479537461746573747261
Alakuijala & Szabadka Expires April 6, 2016 [Page 74]
Internet-Draft Brotli October 2015
74656769657362757420696e2074686561732070617274206f66636f6e737469
74757465636c61696d20746861746c61626f7261746f7279636f6d7061746962
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b36e75626963616369c3b36e7075626c69636964616472657370756573746173
Alakuijala & Szabadka Expires April 6, 2016 [Page 75]
Internet-Draft Brotli October 2015
726573756c7461646f73696d706f7274616e746572657365727661646f736172
74c3ad63756c6f736469666572656e7465737369677569656e746573726570c3
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d8b9d8a7d985d983d8aad8a8d987d8a7d8a8d8b1d8a7d985d8acd8a7d984d98a
Alakuijala & Szabadka Expires April 6, 2016 [Page 76]
Internet-Draft Brotli October 2015
d988d985d8a7d984d8b5d988d8b1d8acd8afd98ad8afd8a9d8a7d984d8b9d8b6
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626f6479666c6f61743a6c6566743b3c6c6920636c6173733d2268756e647265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 & Szabadka Expires April 6, 2016 [Page 77]
Internet-Draft Brotli October 2015
69643d22696c6c7573747261746564656e67696e656572696e67746572726974
6f72696573617574686f72697469657364697374726962757465643622206865
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206c6172676573746465636c61726174696f6e726567756c6174696f6e73496e
666f726d6174696f6e7472616e736c6174696f6e646f63756d656e7461727969
6e206f7264657220746f223e0a3c686561643e0a3c22206865696768743d2231
6163726f737320746865206f7269656e746174696f6e293b3c2f736372697074
3e696d706c656d656e74656463616e206265207365656e746865726520776173
206164656d6f6e737472617465636f6e7461696e6572223e636f6e6e65637469
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616e743b70783b206d617267696e2d666f6c6c6f7765642062796162696c6974
7920746f20636f6d706c696361746564647572696e672074686520696d6d6967
726174696f6e616c736f2063616c6c65643c683420636c6173733d2264697374
696e6374696f6e7265706c61636564206279676f7665726e6d656e74736c6f63
Alakuijala & Szabadka Expires April 6, 2016 [Page 78]
Internet-Draft Brotli October 2015
6174696f6e206f66696e204e6f76656d62657277686574686572207468653c2f
703e0a3c2f6469763e6163717569736974696f6e63616c6c6564207468652070
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6d6f737420726563656e747368617265207769746820736179696e6720746861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 & Szabadka Expires April 6, 2016 [Page 79]
Internet-Draft Brotli October 2015
674368726973746f706865724d756368206f662074686577726974696e677320
6f6622206865696768743d223273697a65206f662074686576657273696f6e20
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726f746865726174207468652074696d65616e6e6976657273617279676f7665
726e656420627972656c6174656420746f20756c74696d6174656c7920696e6e
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616c4d616e79206f66207468656172677565732074686174616e20416d657269
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206f66676f7665726e6d656e742c3c2f6e6f7363726970743e656e7465726564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 & Szabadka Expires April 6, 2016 [Page 80]
Internet-Draft Brotli October 2015
68657269636964656f6c6f676963616c656e74657270726973657363616c6375
6c6174696e6765617374206f662074686572656d6e616e7473206f66706c7567
696e73706167652f696e6465782e7068703f72656d61696e656420696e747261
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696369616e7372656163686564207468656173206561726c792061733a6e6f6e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 & Szabadka Expires April 6, 2016 [Page 81]
Internet-Draft Brotli October 2015
6e742d73697a653a20776f726b206f6e207468653c2f7363726970743e0a3c62
6567696e7320776974686a6176617363726970743a636f6e7374697475656e74
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6e742d646179756e6976657273616c6c79746f20666f726d2074686562757420
696e7374656164636f72706f726174696f6e617474616368656420746f697320
636f6d6d6f6e6c79726561736f6e7320666f72202671756f743b746865206361
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796164646974696f6e206f66666f72207365766572616c7472616e7366657272
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65616e6420666f722074686566756e6374696f6e696e67706c6179696e672074
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6f6f6b6d6f7265207468616e2061666f6c6c6f77732074686563726561746564
2074686570726573656e636520696e266e6273703b3c2f74643e6e6174696f6e
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7572656420696e73686f77696e6720746865696e74657265737420696e696e20
706c616365206f667475726e206f66207468657468652068656164206f664c6f
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65616e6420616e6f746865726170706561726564206f6e7265636f7264656420
Alakuijala & Szabadka Expires April 6, 2016 [Page 82]
Internet-Draft Brotli October 2015
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64277363616e206c65616420746f72656665727320746f2061626f726465723d
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726b206f6643616c69666f726e69612c7365727665642061732061676f766572
Alakuijala & Szabadka Expires April 6, 2016 [Page 83]
Internet-Draft Brotli October 2015
6e6d656e742e636f6e6365707473206f666d6f76656d656e7420696e09093c64
69762069643d226974222076616c75653d226c616e6775616765206f66617320
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703a2f2f6170706c69636174696f6e736c696e6b2220687265663d2273706563
69666963616c6c792f2f3c215b43444154415b0a4f7267616e697a6174696f6e
646973747269627574696f6e3070783b206865696768743a72656c6174696f6e
736869706465766963652d77696474683c64697620636c6173733d223c6c6162
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616e743b6170706c69636174696f6e2f696e646570656e64656e63652f2f7777
772e676f6f676c656f7267616e697a6174696f6e6175746f636f6d706c657465
726571756972656d656e7473636f6e7365727661746976653c666f726d206e61
Alakuijala & Szabadka Expires April 6, 2016 [Page 84]
Internet-Draft Brotli October 2015
6d653d22696e74656c6c65637475616c6d617267696e2d6c6566743a31387468
2063656e74757279616e20696d706f7274616e74696e737469747574696f6e73
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613d22616c6c222076696f6c6174696f6e206f667265666572656e636520746f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 & Szabadka Expires April 6, 2016 [Page 85]
Internet-Draft Brotli October 2015
74696f6e62656c6f6e67696e6720746f636c61696d65642074686174636f6e73
657175656e6365733c6d657461206e616d653d22477569646520746f20746865
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756e643a747261646974696f6e616c20736f6d65206f662074686520636f6e6e
656374656420746f6578706c6f69746174696f6e656d657267656e6365206f66
636f6e737469747574696f6e4120486973746f7279206f667369676e69666963
616e74206d616e7566616374757265646578706563746174696f6e733e3c6e6f
7363726970743e3c63616e20626520666f756e64626563617573652074686520
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74686520616464656420746f20746865093c6c6920636c6173733d22696e7374
72756d656e74616c536f7669657420556e696f6e61636b6e6f776c6564676564
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6e20746f617474656d70747320746f20646576656c6f706d656e7473496e2066
6163742c207468653c6c6920636c6173733d2261696d706c69636174696f6e73
7375697461626c6520666f726d756368206f662074686520636f6c6f6e697a61
Alakuijala & Szabadka Expires April 6, 2016 [Page 86]
Internet-Draft Brotli October 2015
74696f6e707265736964656e7469616c63616e63656c427562626c6520496e66
6f726d6174696f6e6d6f7374206f662074686520697320646573637269626564
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68616e6473206f6620746865636f75706c65642077697468636f6e6e65637420
Alakuijala & Szabadka Expires April 6, 2016 [Page 87]
Internet-Draft Brotli October 2015
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Alakuijala & Szabadka Expires April 6, 2016 [Page 88]
Internet-Draft Brotli October 2015
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Alakuijala & Szabadka Expires April 6, 2016 [Page 89]
Internet-Draft Brotli October 2015
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d0b7d0b0d189d0b8d182d18bd09bd183d187d188d0b8d0b5e0a4a8e0a4b9e0a5
Alakuijala & Szabadka Expires April 6, 2016 [Page 90]
Internet-Draft Brotli October 2015
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Alakuijala & Szabadka Expires April 6, 2016 [Page 91]
Internet-Draft Brotli October 2015
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736564206f6e20746865204d6173736163687573657474737461626c6520626f
Alakuijala & Szabadka Expires April 6, 2016 [Page 92]
Internet-Draft Brotli October 2015
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Alakuijala & Szabadka Expires April 6, 2016 [Page 93]
Internet-Draft Brotli October 2015
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3c2f7370616e3e6973206f6674656e2075736564696e20616e20617474656d70
Alakuijala & Szabadka Expires April 6, 2016 [Page 94]
Internet-Draft Brotli October 2015
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796c653d22616c6d6f737420616c776179736172652063757272656e746c7965
Alakuijala & Szabadka Expires April 6, 2016 [Page 95]
Internet-Draft Brotli October 2015
787072657373696f6e206f667068696c6f736f706879206f66666f72206d6f72
65207468616e636976696c697a6174696f6e736f6e207468652069736c616e64
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657373696e20776869636820636173653b20746578742d616c69676e3a737472
Alakuijala & Szabadka Expires April 6, 2016 [Page 96]
Internet-Draft Brotli October 2015
75637475726520616e643b206261636b67726f756e643a726567617264696e67
20746865737570706f7274656420746865697320616c736f206b6e6f776e7374
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6e6174757265206f6620746865207468652070656f706c6520696e20696e2061
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223130302522726567617264696e672074686520526f6d616e20436174686f6c
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737465722e6a73223e3c2f7363726970743e636f6d62696e6174696f6e206f66
Alakuijala & Szabadka Expires April 6, 2016 [Page 97]
Internet-Draft Brotli October 2015
206d617267696e77696474683d22637265617465456c656d656e7428772e6174
746163684576656e74283c2f613e3c2f74643e3c2f74723e7372633d22687474
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62656361757365206f6620697473726570726573656e7473207468653c666f72
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737369626c656d6f7265206c696b656c7920746f616e20696e63726561736520
696e6861766520616c736f206265656e636f72726573706f6e647320746f616e
6e6f756e6365642074686174616c69676e3d227269676874223e6d616e792063
6f756e7472696573666f72206d616e792079656172736561726c69657374206b
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62696e6720746865207374796c653d22636f6c6f723a616c74686f7567682074
Alakuijala & Szabadka Expires April 6, 2016 [Page 98]
Internet-Draft Brotli October 2015
6865726562657374206b6e6f776e20666f727375626d697422206e616d653d22
6d756c7469706c69636174696f6e6d6f7265207468616e206f6e65207265636f
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73757266616365206f66207468656170706c69656420746f20746865666f7265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 & Szabadka Expires April 6, 2016 [Page 99]
Internet-Draft Brotli October 2015
6174696f6e206f660a3c2f686561643e0a3c626f64796c6f6361746564206f6e
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Alakuijala & Szabadka Expires April 6, 2016 [Page 100]
Internet-Draft Brotli October 2015
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Alakuijala & Szabadka Expires April 6, 2016 [Page 101]
Internet-Draft Brotli October 2015
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Alakuijala & Szabadka Expires April 6, 2016 [Page 102]
Internet-Draft Brotli October 2015
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Alakuijala & Szabadka Expires April 6, 2016 [Page 103]
Internet-Draft Brotli October 2015
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646572697665732066726f6d20746865726174686572207468616e2074686520
Alakuijala & Szabadka Expires April 6, 2016 [Page 104]
Internet-Draft Brotli October 2015
6120636f6d62696e6174696f6e206f667374796c653d2277696474683a313030
456e676c6973682d737065616b696e67636f6d707574657220736369656e6365
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417269616c2c2048656c7665746963612c3c2f613e3c7370616e20636c617373
Alakuijala & Szabadka Expires April 6, 2016 [Page 105]
Internet-Draft Brotli October 2015
3d223c2f7363726970743e3c73637269707420706f6c69746963616c20706172
7469657374643e3c2f74723e3c2f7461626c653e3c687265663d22687474703a
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706f6c6974616e20617265616d616b657320697420706f737369626c6561636b
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6564207468617420746865636f6e7363696f75736e65737320616e64666f726d
Alakuijala & Szabadka Expires April 6, 2016 [Page 106]
Internet-Draft Brotli October 2015
65726c79206b6e6f776e206173737572726f756e646564206279207468656669
72737420617070656172656420696e6f63636173696f6e616c6c792075736564
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63756c6d696e6174696e6720696e2074686543494120576f726c642046616374
Alakuijala & Szabadka Expires April 6, 2016 [Page 107]
Internet-Draft Brotli October 2015
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79206f66207468657374796c653d226261636b67726f756e642d3c6c693e3c65
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d0bfd0bbd0b0d182d0bdd0bed0bcd0b0d182d0b5d180d0b8d0b0d0bbd18bd0bf
Alakuijala & Szabadka Expires April 6, 2016 [Page 108]
Internet-Draft Brotli October 2015
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Alakuijala & Szabadka Expires April 6, 2016 [Page 109]
Internet-Draft Brotli October 2015
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Alakuijala & Szabadka Expires April 6, 2016 [Page 110]
Internet-Draft Brotli October 2015
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72616d6d696e67206c616e67756167653c2f613e3c6120687265663d22687474
Alakuijala & Szabadka Expires April 6, 2016 [Page 111]
Internet-Draft Brotli October 2015
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Alakuijala & Szabadka Expires April 6, 2016 [Page 112]
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6772616d6d696e6765636f6e6f6d696320646576656c6f706d656e7464657465
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Alakuijala & Szabadka Expires April 6, 2016 [Page 113]
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54696d652829706f7274756775c3aa732028646f2042726173696c29d0bed180
Alakuijala & Szabadka Expires April 6, 2016 [Page 114]
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Alakuijala & Szabadka Expires April 6, 2016 [Page 115]
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e0a495e0a589e0a4aae0a580e0a4b0e0a4bee0a487e0a49fe0a4b5e0a4bfe0a4
9ce0a58de0a49ee0a4bee0a4aae0a4a8e0a495e0a4bee0a4b0e0a58de0a4b0e0
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 648 bytes, and the
zlib CRC is 0x3d965f81.
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 " "
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19 "" Identity "\""
20 "" Identity "."
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 "\""
Alakuijala & Szabadka Expires April 6, 2016 [Page 117]
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67 "." Identity "("
68 "" UppercaseAll " "
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 ". "
Alakuijala & Szabadka Expires April 6, 2016 [Page 118]
Internet-Draft Brotli October 2015
115 " " UppercaseAll "."
116 "" UppercaseAll "='"
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 April 6, 2016 [Page 119]
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