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authorZoltan Szabadka <szabadka@google.com>2016-04-20 10:48:14 +0200
committerZoltan Szabadka <szabadka@google.com>2016-04-20 10:48:14 +0200
commite96d5b29e7690768c495ce2cd4631a303d7581df (patch)
tree4310c63ba9b2e97be9d0094e0caa069944a8cdb0 /docs
parent26cf47f3f03da1cb66e64d09c9201ac4e2b4217c (diff)
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Address review comments in the specification.
This commit updates the draft to the ietf -09 version: https://www.ietf.org/id/draft-alakuijala-brotli-09.txt In this version review comments from Jean-loup Gailly and the ietf secdir review were addressed.
Diffstat (limited to 'docs')
-rw-r--r--docs/draft-alakuijala-brotli-09.nroff402
-rw-r--r--docs/draft-alakuijala-brotli-09.txt2068
2 files changed, 1438 insertions, 1032 deletions
diff --git a/docs/draft-alakuijala-brotli-09.nroff b/docs/draft-alakuijala-brotli-09.nroff
index 5bbf373..6397af9 100644
--- a/docs/draft-alakuijala-brotli-09.nroff
+++ b/docs/draft-alakuijala-brotli-09.nroff
@@ -7,9 +7,9 @@
.ds LF Alakuijala & Szabadka
.ds RF FORMFEED[Page %]
.ds LH Internet-Draft
-.ds RH December 2015
+.ds RH April 2016
.ds CH Brotli
-.ds CF Expires June 10, 2016
+.ds CF Expires October 19, 2016
.hy 0
.nh
.ad l
@@ -18,13 +18,13 @@
.tl 'Network Working Group''J. Alakuijala'
.tl 'Internet-Draft''Z. Szabadka'
.tl 'Intended Status: Informational''Google, Inc'
-.tl 'Expires: June 10, 2016''December 2015'
+.tl 'Expires: October 19, 2016''April 2016'
.fi
.ce 2
Brotli Compressed Data Format
-draft-alakuijala-brotli-08
+draft-alakuijala-brotli-09
.fi
.in 3
@@ -52,12 +52,12 @@ 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 June 10, 2016.
+This Internet-Draft will expire on October 19, 2016.
.ti 0
Copyright Notice
-Copyright (c) 2015 IETF Trust and the persons identified as the document
+Copyright (c) 2016 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
@@ -220,9 +220,27 @@ 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
+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).
+relative lsb position).
+
+As an example, consider packing the following data elements into
+a sequence of 3 bytes: 3-bit integer value 6, 4-bit integer value 2,
+prefix code 110, prefix code 10, 12-bit integer value 3628.
+
+.nf
+ byte 2 byte 1 byte 0
+ +--------+--------+--------+
+ |11100010|11000101|10010110|
+ +--------+--------+--------+
+ ^ ^ ^ ^ ^
+ | | | | |
+ | | | | +------ integer value 6
+ | | | +---------- integer value 2
+ | | +-------------- prefix code 110
+ | +---------------- prefix code 10
+ +----------------------------- integer value 3628
+.fi
.ti 0
2. Compressed representation overview
@@ -693,26 +711,26 @@ are compressed using a prefix code. The alphabet for code lengths
is as follows:
.nf
- 0 - 15: Represent code lengths of 0 - 15
- 16: Copy the previous non-zero code length 3 - 6 times
+ 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
+ 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)
+ (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.
+ 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)
+ (3..10 on the next 3 bits)
.fi
Note that a code of 16 that follows an immediately preceding 16 modifies the
@@ -763,7 +781,7 @@ We can now define the format of the complex prefix code as follows:
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
+ 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.
@@ -816,7 +834,7 @@ 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
+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
@@ -913,7 +931,7 @@ 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.
+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
@@ -929,17 +947,17 @@ are as follows:
.nf
.KS
- 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
+ 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
.KE
.fi
@@ -948,17 +966,17 @@ of copy extra bits, and the range of copy lengths are as follows:
.nf
.KS
- 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
+ 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
.KE
.fi
@@ -969,34 +987,34 @@ and a copy length code, the following table can be used:
.KS
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 |
- | | | |
- +---------+---------+---------+
+ 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 |
+ | | | |
+ +----------+----------+----------+
.KE
.fi
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 bits 0-2
-(counted from the LSB) of the insert-and-copy length code.
-The insert length code within its range is determined by bits 3-5
-(counted from the LSB) of the insert-and-copy length code.
+The copy length code within its range is determined by bits 0..2
+(counted from the lsb) of the insert-and-copy length code.
+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.
@@ -1020,8 +1038,8 @@ 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
+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.
@@ -1051,24 +1069,24 @@ Each block count in the compressed data is represented with a pair
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
+extra bits can be 0..24, and it is dependent on the block count
code. The symbols of the block count code alphabet, along with the
number of extra bits, and the range of block counts are as follows:
.nf
.KS
- 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
+ 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
.KE
.fi
@@ -1262,9 +1280,9 @@ now define the format of the context map (the same format is used
for literal and distance context maps):
.nf
- 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)
+ 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
@@ -1398,7 +1416,7 @@ The form of these elementary transforms is as follows:
.fi
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,
+characters and converted to upper-case by taking 1..3 bytes at a time,
using the algorithm below:
.nf
@@ -1447,10 +1465,10 @@ previous sections.
The stream header has only the following one field:
.nf
- 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):
+ 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
----- -----------
@@ -1527,7 +1545,7 @@ the following:
zeros, then the stream should be rejected
as invalid)
- 0 - 7 bits: fill bits until the next byte boundary,
+ 0..7 bits: fill bits until the next byte boundary,
must be all zeros
MSKIPLEN bytes of metadata, not part of the
@@ -1546,7 +1564,7 @@ the following:
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
+ 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):
@@ -1555,13 +1573,13 @@ the following:
----- -----------
1 0
2 0001
- 3-4 x0011
- 5-8 xx0101
- 9-16 xxx0111
- 17-32 xxxx1001
- 33-64 xxxxx1011
- 65-128 xxxxxx1101
- 129-256 xxxxxxx1111
+ 3..4 x0011
+ 5..8 xx0101
+ 9..16 xxx0111
+ 17..32 xxxx1001
+ 33..64 xxxxx1011
+ 65..128 xxxxxx1101
+ 129..256 xxxxxxx1111
Prefix code over the block type code alphabet for
literal block types, appears only if NBLTYPESL >= 2
@@ -1572,8 +1590,8 @@ the following:
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
+ 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, appears only if NBLTYPESI >= 2
@@ -1584,8 +1602,8 @@ the following:
Block count code + extra bits for first insert-and-copy
block count, appears only if NBLTYPESI >= 2
- 1-11 bits: NBLTYPESD, # of distance block types, encoded
- with the same variable length code as above
+ 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
@@ -1604,15 +1622,15 @@ the following:
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
+ 1..11 bits: NTREESL, # of literal prefix trees, encoded
+ with the same variable length code as NBLTYPESL
Literal context map, encoded as described in Section 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
+ 1..11 bits: NTREESD, # of distance prefix trees, encoded
+ with the same variable length code as NBLTYPESD
Distance context map, encoded as described in Section 7.3.,
appears only if NTREESD >= 2, otherwise the context map
@@ -1806,19 +1824,183 @@ reference with <length = 5, distance = 2> adds X,Y,X,Y,X to the
uncompressed stream.
.ti 0
-11. Security Considerations
+11. Considerations for compressor implementations
+
+Since the intent of this document is to define the brotli compressed data format
+without reference to any particular compression algorithm, the material in this
+section is not part of the definition of the format, and a compressor need not
+follow it in order to be compliant.
+
+.ti 0
+11.1. Trivial compressor
+
+In this section we present a very simple algorithm that produces a valid brotli
+stream representing an arbitrary sequence of uncompressed bytes in the form of
+the following C++ language function.
+
+.nf
+ string BrotliCompressTrivial(const string& u) {
+ if (u.empty()) {
+ return string(1, 6);
+ }
+ int i;
+ string c;
+ c.append(1, 12);
+ for (i = 0; i + 65535 < u.size(); i += 65536) {
+ c.append(1, 248);
+ c.append(1, 255);
+ c.append(1, 15);
+ c.append(&u[i], 65536);
+ }
+ if (i < u.size()) {
+ int r = u.size() - i - 1;
+ c.append(1, (r & 31) << 3);
+ c.append(1, r >> 5);
+ c.append(1, 8 + (r >> 13));
+ c.append(&u[i], r + 1);
+ }
+ c.append(1, 3);
+ return c;
+ }
+.fi
+
+Note that this simple algorithm does not actually compress data, that is, the
+brotli representation will always be bigger than the original, but it
+shows that every sequence of N uncompressed bytes can be represented with a
+valid brotli stream that is not longer than N + (3 * (N >> 16) + 5) bytes.
+
+.ti 0
+11.2. Aligning compressed meta-blocks to byte boundaries
+
+As described in Section 9., only those meta-blocks that immediately follow an
+uncompressed meta-block or a metadata meta-block are guaranteed to start on a
+byte boundary. In some applications, it might be required that every
+non-metadata meta-block starts on a byte boundary. This can be achieved by
+appending an empty metadata meta-block after every non-metadata meta-block that
+does not end on a byte boundary.
+
+.ti 0
+11.3. Creating self-contained parts within the compressed data
+
+In some encoder implementations it might be required to make a sequence of
+bytes within a brotli stream self-contained, that is, such that they
+can be decompressed independently from previous parts of the compressed data.
+This is a useful feature for three reasons. First, if a large compressed file
+is damaged, it is possible to recover some of the file after the damage.
+Second, it is useful when doing differential transfer of compressed data. If
+a sequence of uncompressed bytes is unchanged and compressed independently
+from previous data, then the compressed representation may also be
+unchanged and can therefore be transferred very cheaply. Third, if sequences of
+uncompressed bytes are compressed independently, it allows for parallel
+compression of these byte sequences within the same file, in addition
+to parallel compression of multiple files.
+
+Given two sequences of uncompressed bytes, U0 and U1, we will now describe how
+to create two sequences of compressed bytes, C0 and C1, such that the
+concatenation of C0 and C1 is a valid brotli stream, and that C0 and C1
+(together with the first byte of C0 that contains the window size)
+can be decompressed independently from each other to U0 and U1.
+
+When compressing the byte sequence U0 to produce C0, we can use any compressor
+that works on the complete set of uncompressed bytes U0, with the following two
+changes. First, the ISLAST bit of the last meta-block of C0 must not be set.
+Second, C0 must end at a byte-boundary, which can be ensured by appending an
+empty metadata meta-block to it, as in Section 11.2.
+
+When compressing the byte sequence U1 to produce C1, we can use any compressor
+that starts a new meta-block at the beginning of U1 within the U0+U1 input
+stream, with the following two changes. First, backward distances in C1 must
+not refer to static dictionary words or uncompressed bytes in U0.
+Even if a sequence of bytes in U1 would match a static dictionary word, or a
+sequence of bytes that overlaps U0, the compressor must represent this
+sequence of bytes with a combination of literal insertions and backward
+references to bytes in U1 instead. Second, the ring
+buffer of last four distances must be replenished first with distances in C1
+before using it to encode other distances in C1. Note that both compressors
+producing C0 and C1 have to use the same window size, but the stream header is
+emitted only by the compressor that produces C0.
+
+Note that this method can be easily generalized to more than two sequences
+of uncompressed bytes.
+
+.ti 0
+12. 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.
+specification, where non-conformant compressed data sequences should be
+discarded.
+
A possible attack against a system containing a decompressor
-implementation (e.g. a web browser) is to exploit a buffer
-overflow caused by an invalid compressed data. Therefore decompressor
+implementation (e.g. a web browser) is to exploit a buffer overflow
+triggered by invalid compressed data. Therefore decompressor
implementations should perform bounds-checking for each memory access
-that result from values decoded from the compressed stream.
+that result from values decoded from the compressed stream and derivatives
+therof.
+
+Another possible attack against a system containing a decompressor
+implementation is to provide it (either valid or invalid) compressed data
+that can make the decompressor system's resource consumption (cpu, memory, or
+storage) to be disproportionately large compared to the size of the
+compressed data. In addition to the size of the compressed data, the amount of
+cpu, memory and storage required to decompress a single compressed meta-block
+within a brotli stream is controlled by the following two paramters: the size of
+the uncompressed meta-block, which is encoded at the start of the compressed
+meta-block, and the size of the sliding window, which is encoded at the start
+of the brotli stream. Decompressor implementations in systems where
+memory or storage is constrained should perform a sanity-check on these two
+parameters. The uncompressed meta-block size that was decoded from the
+compressed stream should be compared against either a hard limit, given by the
+system's constraints or some expectation about the uncompressed data, or against
+a certain multiple of the size of the compressed data. If the uncompressed
+meta-block size is determined to be too high, the compressed data should be
+rejected. Likewise, when the complete uncompressed stream is kept in the
+system containing the decompressor implementation, the total uncompressed
+size of the stream should be checked before decompressing each additional
+meta-block. If the size of the sliding window that was decoded from the start
+of the compressed stream is greater than a certain soft limit, then the
+decompressor implementation should, at first, allocate a smaller sliding
+window that fits the first uncompressed meta-block, and afterwards, before
+decompressing each additional meta-block, it should increase the size of the
+sliding window until the sliding window size specified in the compressed data
+is reached.
+
+Correspondingly, possible attacks against a system containing a compressor
+implementation (e.g. a web server) are to exploit a buffer overflow or cause
+disproportionately large resource consumption by providing e.g. uncompressible
+data.
+As described in Section 11.1., an output buffer of
+
+.nf
+ S(N) = N + (3 * (N >> 16) + 5)
+.fi
+
+bytes is sufficient to hold a valid compressed brotli
+stream representing an arbitrary sequence of N uncompressed bytes.
+Therefore compressor implementations should allocate at least S(N) bytes of
+output buffer before compressing N bytes of data with unknown compressibility
+and should perform bounds-checking for each write into this output buffer.
+If their output buffer is full, compresor implementations should
+revert to the trivial compression algorithm described in Section 11.1.
+The resourse consumption of a compressor implementation for a particular input
+data depends mostly on the algorithm used to find backward matches and on the
+algorithm used to construct context maps and prefix codes and only to a lesser
+extent on the input data itself. If the system containing a compressor
+implementation is overloaded, a possible way to reduce resource usage is to
+switch to more simple algorithms for backward reference search and prefix code
+construction, or to fall back to the trivial compression algorithm described in
+Section 11.1.
+
+A possible attack against a system that sends compressed data over an encrypted
+channel is the following. An attacker who can repeatedly mix arbitrary
+(attacker-supplied) data with secret data (passwords, cookies) and observe the
+length of the ciphertext can potentially reconstruct the secret data. To
+protect against this kind of attack, applications should not mix sensitive data
+with non-sensitive, potentially attacker-supplied data in the same compressed
+stream.
.ti 0
-12. IANA Considerations
+13. IANA Considerations
The "HTTP Content Coding Registry" has been updated with the
registration below:
@@ -1834,7 +2016,7 @@ registration below:
.fi
.ti 0
-13. Informative References
+14. Informative References
.in 14
.ti 3
@@ -1858,7 +2040,7 @@ http://www.ietf.org/rfc/rfc1951.txt
.in 3
.ti 0
-14. Source code
+15. Source code
Source code for a C language implementation of a brotli compliant
decompressor and a C++ language implementation of a compressor is
@@ -1866,7 +2048,7 @@ available in the brotli open-source project:
https://github.com/google/brotli
.ti 0
-15. Acknowledgments
+16. Acknowledgments
The authors would like to thank Mark Adler, Robert Obryk, Thomas
Pickert, and Joe Tsai for providing helpful review comments,
diff --git a/docs/draft-alakuijala-brotli-09.txt b/docs/draft-alakuijala-brotli-09.txt
index e119136..ffc07c2 100644
--- a/docs/draft-alakuijala-brotli-09.txt
+++ b/docs/draft-alakuijala-brotli-09.txt
@@ -7,11 +7,11 @@
Network Working Group J. Alakuijala
Internet-Draft Z. Szabadka
Intended Status: Informational Google, Inc
-Expires: June 10, 2016 December 2015
+Expires: October 19, 2016 April 2016
Brotli Compressed Data Format
- draft-alakuijala-brotli-08
+ draft-alakuijala-brotli-09
Abstract
@@ -35,11 +35,11 @@ Status of this Memo
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 June 10, 2016.
+ This Internet-Draft will expire on October 19, 2016.
Copyright Notice
- Copyright (c) 2015 IETF Trust and the persons identified as the
+ Copyright (c) 2016 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
@@ -55,9 +55,9 @@ Copyright Notice
-Alakuijala & Szabadka Expires June 10, 2016 [Page 1]
+Alakuijala & Szabadka Expires October 19, 2016 [Page 1]
-Internet-Draft Brotli December 2015
+Internet-Draft Brotli April 2016
Table of Contents
@@ -89,14 +89,18 @@ Table of Contents
9.2. Format of the meta-block header . . . . . . . . . . . . . 29
9.3. Format of the meta-block data . . . . . . . . . . . . . . 32
10. Decoding algorithm . . . . . . . . . . . . . . . . . . . . . 33
- 11. Security Considerations . . . . . . . . . . . . . . . . . . . 36
- 12. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 36
- 13. Informative References . . . . . . . . . . . . . . . . . . . 36
- 14. Source code . . . . . . . . . . . . . . . . . . . . . . . . . 37
- 15. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 37
- Appendix A. Static dictionary data . . . . . . . . . . . . . . . 37
- Appendix B. List of word transformations . . . . . . . . . . . . 117
- Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 120
+ 11. Considerations for compressor implementations . . . . . . . . 36
+ 11.1. Trivial compressor . . . . . . . . . . . . . . . . . . . 36
+ 11.2. Aligning compressed meta-blocks to byte boundaries . . . 37
+ 11.3. Creating self-contained parts within the compressed data 37
+ 12. Security Considerations . . . . . . . . . . . . . . . . . . . 38
+ 13. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 39
+ 14. Informative References . . . . . . . . . . . . . . . . . . . 40
+ 15. Source code . . . . . . . . . . . . . . . . . . . . . . . . . 40
+ 16. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 40
+ Appendix A. Static dictionary data . . . . . . . . . . . . . . . 40
+ Appendix B. List of word transformations . . . . . . . . . . . . 121
+ Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 124
@@ -107,13 +111,9 @@ Table of Contents
-
-
-
-
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 2]
-Internet-Draft Brotli December 2015
+Internet-Draft Brotli April 2016
1. Introduction
@@ -167,9 +167,9 @@ Internet-Draft Brotli December 2015
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 3]
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+Internet-Draft Brotli April 2016
The specification specifies a method for representing a sequence of
@@ -223,9 +223,9 @@ Internet-Draft Brotli December 2015
-Alakuijala & Szabadka Expires June 10, 2016 [Page 4]
+Alakuijala & Szabadka Expires October 19, 2016 [Page 4]
-Internet-Draft Brotli December 2015
+Internet-Draft Brotli April 2016
This document does not address the issue of the order in which bits
@@ -250,9 +250,25 @@ Internet-Draft Brotli December 2015
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
+ 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).
+ bit of the code in the relative lsb position).
+
+ As an example, consider packing the following data elements into a
+ sequence of 3 bytes: 3-bit integer value 6, 4-bit integer value 2,
+ prefix code 110, prefix code 10, 12-bit integer value 3628.
+
+ byte 2 byte 1 byte 0
+ +--------+--------+--------+
+ |11100010|11000101|10010110|
+ +--------+--------+--------+
+ ^ ^ ^ ^ ^
+ | | | | |
+ | | | | +------ integer value 6
+ | | | +---------- integer value 2
+ | | +-------------- prefix code 110
+ | +---------------- prefix code 10
+ +----------------------------- integer value 3628
2. Compressed representation overview
@@ -261,6 +277,13 @@ Internet-Draft Brotli December 2015
(16 MiB) uncompressed bytes. The final uncompressed data is the
concatenation of the uncompressed sequences from each meta-block.
+
+
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+
+Internet-Draft Brotli April 2016
+
+
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
@@ -276,14 +299,6 @@ Internet-Draft Brotli December 2015
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
-
-
-
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-
-Internet-Draft Brotli December 2015
-
-
the brotli format, a string reference may instead refer to a static
dictionary entry.
@@ -318,6 +333,13 @@ Internet-Draft Brotli December 2015
extra bits that are added to the base values determined by the codes.
The number of extra bits is determined by the code.
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 6]
+
+Internet-Draft Brotli April 2016
+
+
One meta-block command then appears as a sequence of prefix codes:
Insert-and-copy length, literal, literal, ..., literal, distance
@@ -332,14 +354,6 @@ Internet-Draft Brotli December 2015
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
-
-
-
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-
-Internet-Draft Brotli December 2015
-
-
static dictionary entry can vary from the copy length.)
The last command in the meta-block may end with the last literal if
@@ -375,6 +389,13 @@ Internet-Draft Brotli December 2015
block types assigned to those elements. Each square-bracketed group
is a block that uses the same block type:
+
+
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+
+Internet-Draft Brotli April 2016
+
+
[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
@@ -388,14 +409,6 @@ Internet-Draft Brotli December 2015
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
-
-
-
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-
-Internet-Draft Brotli December 2015
-
-
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
@@ -431,6 +444,14 @@ Internet-Draft Brotli December 2015
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. The matrix of the prefix code
+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 8]
+
+Internet-Draft Brotli April 2016
+
+
indexes for each block type and context ID, called the context map,
is encoded in a compact form in the meta-block header.
@@ -444,14 +465,6 @@ Internet-Draft Brotli December 2015
In addition to the parts listed above (prefix code for insert-and-
copy lengths, literals, distances, block types and block counts, and
-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 8]
-
-Internet-Draft Brotli December 2015
-
-
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
@@ -487,27 +500,18 @@ Internet-Draft Brotli December 2015
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:
-
-
-
-
-
-
-
-
-
-
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 9]
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+Internet-Draft Brotli April 2016
+ 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
@@ -549,21 +553,24 @@ Internet-Draft Brotli December 2015
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
-Alakuijala & Szabadka Expires June 10, 2016 [Page 10]
+
+
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+Internet-Draft Brotli April 2016
+ 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.
@@ -605,20 +612,16 @@ Internet-Draft Brotli December 2015
Example:
- Consider the alphabet ABCDEFGH, with bit lengths (3, 3, 3, 3, 3, 2,
- 4, 4). After step 1, we have:
-
-
-
-
-
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+
+ Consider the alphabet ABCDEFGH, with bit lengths (3, 3, 3, 3, 3, 2,
+ 4, 4). After step 1, we have:
N bl_count[N]
- -----------
@@ -668,12 +671,9 @@ Internet-Draft Brotli December 2015
-
-
-
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+Internet-Draft Brotli April 2016
+-----------------+-------------------------+------------+
@@ -727,9 +727,9 @@ Internet-Draft Brotli December 2015
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Prefix codes of the same bit length must be assigned to the symbols
@@ -763,34 +763,34 @@ Internet-Draft Brotli December 2015
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
+ 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
+ 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)
+ (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.
+ 17: Repeat a code length of 0 for 3..10 times.
(3 bits of length)
A repeated code length code of 17 modifies the
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+Internet-Draft Brotli April 2016
repeat count of the previous one as follows:
repeat count = (8 * (repeat count - 2)) +
- (3 - 10 on the next 3 bits)
+ (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
@@ -835,13 +835,13 @@ Internet-Draft Brotli December 2015
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
+ 5, and they are represented with 2..4 bits according to
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 15]
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the variable length code above. A code length of 0 means
@@ -895,14 +895,14 @@ Internet-Draft Brotli December 2015
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 16]
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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
+ 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
@@ -951,9 +951,9 @@ Internet-Draft Brotli December 2015
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 17]
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the stream should be rejected as invalid.
@@ -995,8 +995,8 @@ Internet-Draft Brotli December 2015
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.
+ 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.
@@ -1007,9 +1007,9 @@ Internet-Draft Brotli December 2015
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We describe the insert-and-copy length code alphabet in terms of the
@@ -1018,32 +1018,32 @@ Internet-Draft Brotli December 2015
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
+ Extra Extra Extra
+ Code Bits Lengths Code Bits Lengths Code Bits Lengths
+ ---- ---- ------- ---- ---- ------- ---- ---- -------
+ 0 0 0 8 2 10..13 16 6 130..193
+ 1 0 1 9 2 14..17 17 7 194..321
+ 2 0 2 10 3 18..25 18 8 322..577
+ 3 0 3 11 3 26..33 19 9 578..1089
+ 4 0 4 12 4 34..49 20 10 1090..2113
+ 5 0 5 13 4 50..65 21 12 2114..6209
+ 6 1 6,7 14 5 66..97 22 14 6210..22593
+ 7 1 8,9 15 5 98..129 23 24 22594..16799809
The symbols of the copy length code alphabet, along with the number
of copy extra bits, and the range of copy lengths are as follows:
- Extra Extra Extra
- Code Bits Lengths Code Bits Lengths Code Bits Lengths
- ---- ---- ------ ---- ---- ------- ---- ---- -------
- 0 0 2 8 1 10,11 16 5 70-101
- 1 0 3 9 1 12,13 17 5 102-133
- 2 0 4 10 2 14-17 18 6 134-197
- 3 0 5 11 2 18-21 19 7 198-325
- 4 0 6 12 3 22-29 20 8 326-581
- 5 0 7 13 3 30-37 21 9 582-1093
- 6 0 8 14 4 38-53 22 10 1094-2117
- 7 0 9 15 4 54-69 23 24 2118-16779333
+ 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:
@@ -1063,38 +1063,38 @@ Internet-Draft Brotli December 2015
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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 |
- | | | |
- +---------+---------+---------+
+ 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 bits 0-2 (counted from the
- LSB) of the insert-and-copy length code. The insert length code
- within its range is determined by bits 3-5 (counted from the LSB) of
+ code within its range is determined by bits 0..2 (counted from the
+ lsb) of the insert-and-copy length code. 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.
@@ -1119,13 +1119,13 @@ Internet-Draft Brotli December 2015
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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
+ 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.
@@ -1157,9 +1157,9 @@ Internet-Draft Brotli December 2015
bits are encoded back-to-back, the block count code is encoded using
a prefix code over the block count code alphabet, while the extra
bits value is encoded as a fixed-width integer value. The number of
- extra bits can be 0 - 24, and it is dependent on the block count
- code. The symbols of the block count code alphabet, along with the
- number of extra bits, and the range of block counts are as follows:
+ extra bits can be 0..24, and it is dependent on the block count code.
+ The symbols of the block count code alphabet, along with the number
+ of extra bits, and the range of block counts are as follows:
@@ -1175,23 +1175,23 @@ Internet-Draft Brotli December 2015
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-
-
- 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
+Internet-Draft Brotli April 2016
+
+
+ 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
@@ -1231,9 +1231,9 @@ Internet-Draft Brotli December 2015
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The Context ID for the UTF8 and Signed context modes is computed
@@ -1287,9 +1287,9 @@ Internet-Draft Brotli December 2015
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4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
@@ -1343,9 +1343,9 @@ Internet-Draft Brotli December 2015
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between 0 and 255, indicating the index of the prefix code to be used
@@ -1386,9 +1386,9 @@ Internet-Draft Brotli December 2015
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)
+ 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
@@ -1399,9 +1399,9 @@ Internet-Draft Brotli December 2015
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+Internet-Draft Brotli April 2016
invalid.
@@ -1455,9 +1455,9 @@ Internet-Draft Brotli December 2015
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* NDBITS[0..24], an array of bit-depth values for each length
@@ -1511,9 +1511,9 @@ Internet-Draft Brotli December 2015
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 27]
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UppercaseFirst(word) = first UTF-8 character of word upper-cased
@@ -1527,7 +1527,7 @@ Internet-Draft Brotli December 2015
empty string if length(word) < k
For the purposes of UppercaseAll, word is parsed into UTF-8
- characters and converted to upper-case by taking 1 - 3 bytes at a
+ characters and converted to upper-case by taking 1..3 bytes at a
time, using the algorithm below:
i = 0
@@ -1567,19 +1567,19 @@ Internet-Draft Brotli December 2015
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 28]
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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):
+ 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
----- -----------
@@ -1623,9 +1623,9 @@ Internet-Draft Brotli December 2015
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of the compressed stream filled with zeros (if the
@@ -1658,7 +1658,7 @@ Internet-Draft Brotli December 2015
zeros, then the stream should be rejected
as invalid)
- 0 - 7 bits: fill bits until the next byte boundary,
+ 0..7 bits: fill bits until the next byte boundary,
must be all zeros
MSKIPLEN bytes of metadata, not part of the
@@ -1679,12 +1679,12 @@ Internet-Draft Brotli December 2015
-Alakuijala & Szabadka Expires June 10, 2016 [Page 30]
+Alakuijala & Szabadka Expires October 19, 2016 [Page 30]
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- 1-11 bits: NBLTYPESL, # of literal block types, encoded with
+ 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):
@@ -1693,13 +1693,13 @@ Internet-Draft Brotli December 2015
----- -----------
1 0
2 0001
- 3-4 x0011
- 5-8 xx0101
- 9-16 xxx0111
- 17-32 xxxx1001
- 33-64 xxxxx1011
- 65-128 xxxxxx1101
- 129-256 xxxxxxx1111
+ 3..4 x0011
+ 5..8 xx0101
+ 9..16 xxx0111
+ 17..32 xxxx1001
+ 33..64 xxxxx1011
+ 65..128 xxxxxx1101
+ 129..256 xxxxxxx1111
Prefix code over the block type code alphabet for
literal block types, appears only if NBLTYPESL >= 2
@@ -1710,8 +1710,8 @@ Internet-Draft Brotli December 2015
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
+ 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, appears only if NBLTYPESI >= 2
@@ -1722,8 +1722,8 @@ Internet-Draft Brotli December 2015
Block count code + extra bits for first insert-and-copy
block count, appears only if NBLTYPESI >= 2
- 1-11 bits: NBLTYPESD, # of distance block types, encoded
- with the same variable length code as above
+ 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
@@ -1735,9 +1735,9 @@ Internet-Draft Brotli December 2015
-Alakuijala & Szabadka Expires June 10, 2016 [Page 31]
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block count, appears only if NBLTYPESD >= 2
@@ -1750,15 +1750,15 @@ Internet-Draft Brotli December 2015
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
+ 1..11 bits: NTREESL, # of literal prefix trees, encoded
+ with the same variable length code as NBLTYPESL
Literal context map, encoded as described in Section 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
+ 1..11 bits: NTREESD, # of distance prefix trees, encoded
+ with the same variable length code as NBLTYPESD
Distance context map, encoded as described in Section 7.3.,
appears only if NTREESD >= 2, otherwise the context map
@@ -1791,9 +1791,9 @@ Internet-Draft Brotli December 2015
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Block type code for next literal block type, appears
@@ -1847,9 +1847,9 @@ Internet-Draft Brotli December 2015
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 33]
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read window size
@@ -1903,9 +1903,9 @@ Internet-Draft Brotli December 2015
-Alakuijala & Szabadka Expires June 10, 2016 [Page 34]
+Alakuijala & Szabadka Expires October 19, 2016 [Page 34]
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do
@@ -1959,9 +1959,9 @@ Internet-Draft Brotli December 2015
-Alakuijala & Szabadka Expires June 10, 2016 [Page 35]
+Alakuijala & Szabadka Expires October 19, 2016 [Page 35]
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+Internet-Draft Brotli April 2016
Note that a duplicated string reference may refer to a string in a
@@ -1974,30 +1974,227 @@ Internet-Draft Brotli December 2015
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
+11. Considerations for compressor implementations
+
+ Since the intent of this document is to define the brotli compressed
+ data format without reference to any particular compression
+ algorithm, the material in this section is not part of the definition
+ of the format, and a compressor need not follow it in order to be
+ compliant.
+
+11.1. Trivial compressor
+
+ In this section we present a very simple algorithm that produces a
+ valid brotli stream representing an arbitrary sequence of
+ uncompressed bytes in the form of the following C++ language
+ function.
+
+ string BrotliCompressTrivial(const string& u) {
+ if (u.empty()) {
+ return string(1, 6);
+ }
+ int i;
+ string c;
+ c.append(1, 12);
+ for (i = 0; i + 65535 < u.size(); i += 65536) {
+ c.append(1, 248);
+ c.append(1, 255);
+ c.append(1, 15);
+ c.append(&u[i], 65536);
+ }
+ if (i < u.size()) {
+ int r = u.size() - i - 1;
+ c.append(1, (r & 31) << 3);
+ c.append(1, r >> 5);
+ c.append(1, 8 + (r >> 13));
+ c.append(&u[i], r + 1);
+ }
+ c.append(1, 3);
+ return c;
+ }
+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 36]
+
+Internet-Draft Brotli April 2016
+
+
+ Note that this simple algorithm does not actually compress data, that
+ is, the brotli representation will always be bigger than the
+ original, but it shows that every sequence of N uncompressed bytes
+ can be represented with a valid brotli stream that is not longer than
+ N + (3 * (N >> 16) + 5) bytes.
+
+11.2. Aligning compressed meta-blocks to byte boundaries
+
+ As described in Section 9., only those meta-blocks that immediately
+ follow an uncompressed meta-block or a metadata meta-block are
+ guaranteed to start on a byte boundary. In some applications, it
+ might be required that every non-metadata meta-block starts on a byte
+ boundary. This can be achieved by appending an empty metadata meta-
+ block after every non-metadata meta-block that does not end on a byte
+ boundary.
+
+11.3. Creating self-contained parts within the compressed data
+
+ In some encoder implementations it might be required to make a
+ sequence of bytes within a brotli stream self-contained, that is,
+ such that they can be decompressed independently from previous parts
+ of the compressed data. This is a useful feature for three reasons.
+ First, if a large compressed file is damaged, it is possible to
+ recover some of the file after the damage. Second, it is useful when
+ doing differential transfer of compressed data. If a sequence of
+ uncompressed bytes is unchanged and compressed independently from
+ previous data, then the compressed representation may also be
+ unchanged and can therefore be transferred very cheaply. Third, if
+ sequences of uncompressed bytes are compressed independently, it
+ allows for parallel compression of these byte sequences within the
+ same file, in addition to parallel compression of multiple files.
+
+ Given two sequences of uncompressed bytes, U0 and U1, we will now
+ describe how to create two sequences of compressed bytes, C0 and C1,
+ such that the concatenation of C0 and C1 is a valid brotli stream,
+ and that C0 and C1 (together with the first byte of C0 that contains
+ the window size) can be decompressed independently from each other to
+ U0 and U1.
+
+ When compressing the byte sequence U0 to produce C0, we can use any
+ compressor that works on the complete set of uncompressed bytes U0,
+ with the following two changes. First, the ISLAST bit of the last
+ meta-block of C0 must not be set. Second, C0 must end at a byte-
+ boundary, which can be ensured by appending an empty metadata meta-
+ block to it, as in Section 11.2.
+
+ When compressing the byte sequence U1 to produce C1, we can use any
+ compressor that starts a new meta-block at the beginning of U1 within
+
+
+
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+
+Internet-Draft Brotli April 2016
+
+
+ the U0+U1 input stream, with the following two changes. First,
+ backward distances in C1 must not refer to static dictionary words or
+ uncompressed bytes in U0. Even if a sequence of bytes in U1 would
+ match a static dictionary word, or a sequence of bytes that overlaps
+ U0, the compressor must represent this sequence of bytes with a
+ combination of literal insertions and backward references to bytes in
+ U1 instead. Second, the ring buffer of last four distances must be
+ replenished first with distances in C1 before using it to encode
+ other distances in C1. Note that both compressors producing C0 and C1
+ have to use the same window size, but the stream header is emitted
+ only by the compressor that produces C0.
+
+ Note that this method can be easily generalized to more than two
+ sequences of uncompressed bytes.
+
+12. 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
- exploit a buffer overflow caused by an invalid compressed data.
- Therefore decompressor implementations should perform bounds-checking
- for each memory access that result from values decoded from the
- compressed stream.
-
-12. IANA Considerations
+ sequences should be discarded.
+
+ A possible attack against a system containing a decompressor
+ implementation (e.g. a web browser) is to exploit a buffer overflow
+ triggered by invalid compressed data. Therefore decompressor
+ implementations should perform bounds-checking for each memory access
+ that result from values decoded from the compressed stream and
+ derivatives therof.
+
+ Another possible attack against a system containing a decompressor
+ implementation is to provide it (either valid or invalid) compressed
+ data that can make the decompressor system's resource consumption
+ (cpu, memory, or storage) to be disproportionately large compared to
+ the size of the compressed data. In addition to the size of the
+ compressed data, the amount of cpu, memory and storage required to
+ decompress a single compressed meta-block within a brotli stream is
+ controlled by the following two paramters: the size of the
+ uncompressed meta-block, which is encoded at the start of the
+ compressed meta-block, and the size of the sliding window, which is
+ encoded at the start of the brotli stream. Decompressor
+ implementations in systems where memory or storage is constrained
+ should perform a sanity-check on these two parameters. The
+ uncompressed meta-block size that was decoded from the compressed
+ stream should be compared against either a hard limit, given by the
+ system's constraints or some expectation about the uncompressed data,
+ or against a certain multiple of the size of the compressed data. If
+ the uncompressed meta-block size is determined to be too high, the
+ compressed data should be rejected. Likewise, when the complete
+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 38]
+
+Internet-Draft Brotli April 2016
+
+
+ uncompressed stream is kept in the system containing the decompressor
+ implementation, the total uncompressed size of the stream should be
+ checked before decompressing each additional meta-block. If the size
+ of the sliding window that was decoded from the start of the
+ compressed stream is greater than a certain soft limit, then the
+ decompressor implementation should, at first, allocate a smaller
+ sliding window that fits the first uncompressed meta-block, and
+ afterwards, before decompressing each additional meta-block, it
+ should increase the size of the sliding window until the sliding
+ window size specified in the compressed data is reached.
+
+ Correspondingly, possible attacks against a system containing a
+ compressor implementation (e.g. a web server) are to exploit a buffer
+ overflow or cause disproportionately large resource consumption by
+ providing e.g. uncompressible data. As described in Section 11.1.,
+ an output buffer of
+
+ S(N) = N + (3 * (N >> 16) + 5)
+
+ bytes is sufficient to hold a valid compressed brotli stream
+ representing an arbitrary sequence of N uncompressed bytes.
+ Therefore compressor implementations should allocate at least S(N)
+ bytes of output buffer before compressing N bytes of data with
+ unknown compressibility and should perform bounds-checking for each
+ write into this output buffer. If their output buffer is full,
+ compresor implementations should revert to the trivial compression
+ algorithm described in Section 11.1. The resourse consumption of a
+ compressor implementation for a particular input data depends mostly
+ on the algorithm used to find backward matches and on the algorithm
+ used to construct context maps and prefix codes and only to a lesser
+ extent on the input data itself. If the system containing a
+ compressor implementation is overloaded, a possible way to reduce
+ resource usage is to switch to more simple algorithms for backward
+ reference search and prefix code construction, or to fall back to the
+ trivial compression algorithm described in Section 11.1.
+
+ A possible attack against a system that sends compressed data over an
+ encrypted channel is the following. An attacker who can repeatedly
+ mix arbitrary (attacker-supplied) data with secret data (passwords,
+ cookies) and observe the length of the ciphertext can potentially
+ reconstruct the secret data. To protect against this kind of attack,
+ applications should not mix sensitive data with non-sensitive,
+ potentially attacker-supplied data in the same compressed stream.
+
+13. IANA Considerations
The "HTTP Content Coding Registry" has been updated with the
registration below:
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 39]
+
+Internet-Draft Brotli April 2016
+
+
+-------+-------------------------------------+------------+
| Name | Description | Reference |
+-------+-------------------------------------+------------+
| br | Brotli Compressed Data Format | RFCXXXX |
+-------+-------------------------------------+------------+
-13. Informative References
+14. Informative References
[HUFFMAN] Huffman, D. A., "A Method for the Construction of Minimum
Redundancy Codes", Proceedings of the Institute of Radio
@@ -2012,26 +2209,18 @@ Internet-Draft Brotli December 2015
version 1.3", RFC 1951, Aladdin Enterprises, May 1996.
http://www.ietf.org/rfc/rfc1951.txt
-
-
-
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-
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-
-
[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
+15. 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
+16. Acknowledgments
The authors would like to thank Mark Adler, Robert Obryk, Thomas
Pickert, and Joe Tsai for providing helpful review comments,
@@ -2047,6 +2236,14 @@ Appendix A. Static dictionary data
74696d65646f776e6c6966656c6566746261636b636f64656461746173686f77
6f6e6c7973697465636974796f70656e6a7573746c696b6566726565776f726b
+
+
+
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+
+Internet-Draft Brotli April 2016
+
+
74657874796561726f766572626f64796c6f7665666f726d626f6f6b706c6179
6c6976656c696e6568656c70686f6d65736964656d6f7265776f72646c6f6e67
7468656d7669657766696e64706167656461797366756c6c686561647465726d
@@ -2068,14 +2265,6 @@ Appendix A. Static dictionary data
73686970726f6f6d48544d4c706c616e54797065646f6e65736176656b656570
666c61676c696e6b736f6c6466697665746f6f6b72617465746f776e6a756d70
746875736461726b6361726466696c6566656172737461796b696c6c74686174
-
-
-
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-
-Internet-Draft Brotli December 2015
-
-
66616c6c6175746f657665722e636f6d74616c6b73686f70766f746564656570
6d6f6465726573747475726e626f726e62616e6466656c6c726f736575726c28
736b696e726f6c65636f6d6561637473616765736d656574676f6c642e6a7067
@@ -2103,6 +2292,14 @@ Internet-Draft Brotli December 2015
426c756564696e673330302c62616c6c666f72646561726e77696c64626f782e
666169726c61636b76657273706169726a756e6574656368696628217069636b
6576696c242822237761726d6c6f7264646f657370756c6c2c30303069646561
+
+
+
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+
+Internet-Draft Brotli April 2016
+
+
647261776875676573706f7466756e646275726e6872656663656c6c6b657973
7469636b686f75726c6f73736675656c31327078737569746465616c52535322
6167656467726579474554226561736561696d736769726c616964733870783b
@@ -2124,14 +2321,6 @@ Internet-Draft Brotli December 2015
6c6966745431393a76696365616e6479646562743e525353706f6f6c6e65636b
626c6f775431363a646f6f726576616c5431373a6c6574736661696c6f72616c
706f6c6c6e6f7661636f6c7367656e6520e28094736f6674726f6d6574696c6c
-
-
-
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-
-Internet-Draft Brotli December 2015
-
-
726f73733c68333e706f75726661646570696e6b3c74723e6d696e69297c2128
6d696e657a683ae862617273686561723030293b6d696c6b202d2d3e69726f6e
667265646469736b77656e74736f696c707574732f6a732f686f6c795432323a
@@ -2159,6 +2348,14 @@ Internet-Draft Brotli December 2015
706970657c2d0a21303032296e646f775b315d3b5b5d3b0a4c6f672073616c74
0d0a090962616e677472696d62617468297b0d0a303070780a7d293b6b6f3aec
6665657361643e0d733a2f2f205b5d3b746f6c6c706c756728297b0a7b0d0a20
+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 42]
+
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+
+
2e6a7327323030706475616c626f61742e4a5047293b0a7d71756f74293b0a0a
27293b0a0d0a7d0d323031343230313532303136323031373230313832303139
3230323032303231323032323230323332303234323032353230323632303237
@@ -2180,14 +2377,6 @@ Internet-Draft Brotli December 2015
656c6c616d61796f7a6f6e61616d6f727069736f6f627261636c6963656c6c6f
64696f73686f726163617369d0b7d0b0d0bdd0b0d0bed0bcd180d0b0d180d183
d182d0b0d0bdd0b5d0bfd0bed0bed182d0b8d0b7d0bdd0bed0b4d0bed182d0be
-
-
-
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-
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-
-
d0b6d0b5d0bed0bdd0b8d185d09dd0b0d0b5d0b5d0b1d18bd0bcd18bd092d18b
d181d0bed0b2d18bd0b2d0bed09dd0bed0bed0b1d09fd0bed0bbd0b8d0bdd0b8
d0a0d0a4d09dd0b5d09cd18bd182d18bd09ed0bdd0b8d0bcd0b4d0b0d097d0b0
@@ -2215,6 +2404,14 @@ Internet-Draft Brotli December 2015
74616b656e61626f7665666c61736866697865646f6674656e6f746865727669
657773636865636b6c6567616c72697665726974656d73717569636b73686170
6568756d616e6578697374676f696e676d6f7669657468697264626173696370
+
+
+
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+
+Internet-Draft Brotli April 2016
+
+
65616365737461676577696474686c6f67696e696465617377726f7465706167
65737573657273647269766573746f7265627265616b736f757468766f696365
73697465736d6f6e746877686572656275696c6477686963686561727468666f
@@ -2236,14 +2433,6 @@ Internet-Draft Brotli December 2015
6e65646d69676874616c62756d7468696e6b626c6f6f6461727261796d616a6f
72747275737463616e6f6e756e696f6e636f756e7476616c696473746f6e6553
74796c654c6f67696e68617070796f636375726c6566743a6672657368717569
-
-
-
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-
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-
-
746566696c6d7367726164656e65656473757262616e66696768746261736973
686f7665726175746f3b726f7574652e68746d6c6d6978656466696e616c596f
757220736c696465746f70696362726f776e616c6f6e65647261776e73706c69
@@ -2271,6 +2460,14 @@ Internet-Draft Brotli December 2015
72757468636c65616e2e7068703f7361696e746d6574616c6c6f7569736d6561
6e7470726f6f666272696566726f77223e67656e7265747275636b6c6f6f6b73
56616c75654672616d652e6e65742f2d2d3e0a3c747279207b0a766172206d61
+
+
+
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+
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+
+
6b6573636f737473706c61696e6164756c747175657374747261696e6c61626f
7268656c707363617573656d616769636d6f746f72746865697232353070786c
656173747374657073436f756e74636f756c64676c617373736964657366756e
@@ -2292,14 +2489,6 @@ Internet-Draft Brotli December 2015
7279323470783b73657475706974616c7973686172706d696e6f727461737465
77616e7473746869732e7265736574776865656c6769726c732f6373732f3130
30253b636c75627373747566666269626c65766f74657320313030306b6f7265
-
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-Internet-Draft Brotli December 2015
-
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@@ -2327,6 +2516,14 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 42]
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-Internet-Draft Brotli December 2015
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@@ -2383,6 +2572,14 @@ Internet-Draft Brotli December 2015
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@@ -2404,14 +2601,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 43]
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@@ -2439,6 +2628,14 @@ Internet-Draft Brotli December 2015
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@@ -2460,14 +2657,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 44]
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@@ -2551,6 +2740,14 @@ Internet-Draft Brotli December 2015
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@@ -2572,14 +2769,6 @@ Internet-Draft Brotli December 2015
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@@ -2628,14 +2825,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 47]
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-Internet-Draft Brotli December 2015
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@@ -2663,6 +2852,14 @@ Internet-Draft Brotli December 2015
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@@ -2684,14 +2881,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 48]
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-Internet-Draft Brotli December 2015
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@@ -2719,6 +2908,14 @@ Internet-Draft Brotli December 2015
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@@ -2740,14 +2937,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 49]
-
-Internet-Draft Brotli December 2015
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@@ -2775,6 +2964,14 @@ Internet-Draft Brotli December 2015
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 53]
+
+Internet-Draft Brotli April 2016
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@@ -2796,14 +2993,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 50]
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-Internet-Draft Brotli December 2015
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@@ -2831,6 +3020,14 @@ Internet-Draft Brotli December 2015
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 54]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -2852,14 +3049,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 51]
-
-Internet-Draft Brotli December 2015
-
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@@ -2887,6 +3076,14 @@ Internet-Draft Brotli December 2015
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 55]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -2908,14 +3105,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 52]
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-Internet-Draft Brotli December 2015
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@@ -2943,6 +3132,14 @@ Internet-Draft Brotli December 2015
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 56]
+
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+
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@@ -2964,14 +3161,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 53]
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-Internet-Draft Brotli December 2015
-
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@@ -2999,6 +3188,14 @@ Internet-Draft Brotli December 2015
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 57]
+
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+
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@@ -3020,14 +3217,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 54]
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-Internet-Draft Brotli December 2015
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@@ -3055,6 +3244,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 58]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -3076,14 +3273,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 55]
-
-Internet-Draft Brotli December 2015
-
-
6c2e7961686f6f2e726573706f6e64666967687465726f627363757265726566
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@@ -3111,6 +3300,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 59]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -3132,14 +3329,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 56]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -3167,6 +3356,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 60]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -3188,14 +3385,6 @@ Internet-Draft Brotli December 2015
706f6c6963792e6d656e20616e64666f6f7465722d3d20747275653b666f7220
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 57]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -3223,6 +3412,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 61]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -3244,14 +3441,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 58]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -3279,6 +3468,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 62]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -3300,14 +3497,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 59]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -3335,6 +3524,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 63]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -3356,14 +3553,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 60]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -3391,6 +3580,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 64]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -3412,14 +3609,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 61]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -3447,6 +3636,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 65]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -3468,14 +3665,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 62]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -3503,6 +3692,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 66]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -3524,14 +3721,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 63]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -3559,6 +3748,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 67]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -3580,14 +3777,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 64]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -3615,6 +3804,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 68]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -3636,14 +3833,6 @@ Internet-Draft Brotli December 2015
d985d8b3d8acd984d8a8d986d8a7d986d8aed8a7d984d8afd983d8aad8a7d8a8
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 65]
-
-Internet-Draft Brotli December 2015
-
-
d8a7d983d8abd8b1d8a8d8a7d8b1d983d8a7d981d8b6d984d8a7d8add984d989
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@@ -3671,6 +3860,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 69]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -3692,14 +3889,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 66]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -3727,6 +3916,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 70]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -3748,14 +3945,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 67]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -3783,6 +3972,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 71]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -3804,14 +4001,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 68]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -3839,6 +4028,14 @@ Internet-Draft Brotli December 2015
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+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 72]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -3860,14 +4057,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 69]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -3895,6 +4084,14 @@ Internet-Draft Brotli December 2015
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+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 73]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -3916,14 +4113,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 70]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -3951,6 +4140,14 @@ Internet-Draft Brotli December 2015
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 74]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -3972,14 +4169,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 71]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -4007,6 +4196,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 75]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -4028,14 +4225,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 72]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -4063,6 +4252,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 76]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -4084,14 +4281,6 @@ Internet-Draft Brotli December 2015
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-
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-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 73]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -4119,6 +4308,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 77]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -4140,14 +4337,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 74]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -4175,6 +4364,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 78]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -4196,14 +4393,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 75]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -4231,6 +4420,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 79]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -4252,14 +4449,6 @@ Internet-Draft Brotli December 2015
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-
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-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 76]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -4287,6 +4476,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 80]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -4308,14 +4505,6 @@ Internet-Draft Brotli December 2015
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-
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-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 77]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -4343,6 +4532,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 81]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -4364,14 +4561,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 78]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -4399,6 +4588,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 82]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -4420,14 +4617,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 79]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -4455,6 +4644,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 83]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -4476,14 +4673,6 @@ Internet-Draft Brotli December 2015
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-
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-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 80]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -4511,6 +4700,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 84]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -4532,14 +4729,6 @@ Internet-Draft Brotli December 2015
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-
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-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 81]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -4567,6 +4756,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 85]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -4588,14 +4785,6 @@ Internet-Draft Brotli December 2015
636f756e7420666f72616c69676e3d726967687474686520636f6d70616e7961
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 82]
-
-Internet-Draft Brotli December 2015
-
-
20636f6e66696e656420746f6120726573756c74206f6676616c75653d222220
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@@ -4623,6 +4812,14 @@ Internet-Draft Brotli December 2015
74686573656374696f6e73206f666973206120636f6d6d6f6e7468656f726965
73206f66646973636f7665726965736173736f63696174696f6e65646765206f
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 86]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -4644,14 +4841,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 83]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -4679,6 +4868,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 87]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -4700,14 +4897,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 84]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -4735,6 +4924,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 88]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -4756,14 +4953,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 85]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -4791,6 +4980,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 89]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -4812,14 +5009,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 86]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -4847,6 +5036,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 90]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -4868,14 +5065,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 87]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -4903,6 +5092,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 91]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -4924,14 +5121,6 @@ Internet-Draft Brotli December 2015
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-
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-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 88]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -4959,6 +5148,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 92]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -4980,14 +5177,6 @@ Internet-Draft Brotli December 2015
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-
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-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 89]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -5015,6 +5204,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 93]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -5036,14 +5233,6 @@ Internet-Draft Brotli December 2015
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-
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-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 90]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -5071,6 +5260,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 94]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -5092,14 +5289,6 @@ Internet-Draft Brotli December 2015
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-
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-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 91]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -5127,6 +5316,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 95]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -5148,14 +5345,6 @@ Internet-Draft Brotli December 2015
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-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 92]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -5183,6 +5372,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 96]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -5204,14 +5401,6 @@ Internet-Draft Brotli December 2015
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-
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-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 93]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -5239,6 +5428,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 97]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -5260,14 +5457,6 @@ Internet-Draft Brotli December 2015
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-
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-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 94]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -5295,6 +5484,14 @@ Internet-Draft Brotli December 2015
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+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 98]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -5316,14 +5513,6 @@ Internet-Draft Brotli December 2015
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-
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-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 95]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -5351,6 +5540,14 @@ Internet-Draft Brotli December 2015
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+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 99]
+
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+
+
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@@ -5372,14 +5569,6 @@ Internet-Draft Brotli December 2015
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-
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-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 96]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -5407,6 +5596,14 @@ Internet-Draft Brotli December 2015
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 100]
+
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+
+
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@@ -5428,14 +5625,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 97]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -5463,6 +5652,14 @@ Internet-Draft Brotli December 2015
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+
+
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@@ -5484,14 +5681,6 @@ Internet-Draft Brotli December 2015
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-
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 98]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -5519,6 +5708,14 @@ Internet-Draft Brotli December 2015
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 102]
+
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+
+
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@@ -5540,14 +5737,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 99]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -5575,6 +5764,14 @@ Internet-Draft Brotli December 2015
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 103]
+
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+
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@@ -5596,14 +5793,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 100]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -5631,6 +5820,14 @@ Internet-Draft Brotli December 2015
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 104]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -5652,14 +5849,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 101]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -5687,6 +5876,14 @@ Internet-Draft Brotli December 2015
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+
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+
+
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@@ -5708,14 +5905,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 102]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -5743,6 +5932,14 @@ Internet-Draft Brotli December 2015
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+
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 106]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -5764,14 +5961,6 @@ Internet-Draft Brotli December 2015
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-
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 103]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -5799,6 +5988,14 @@ Internet-Draft Brotli December 2015
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+
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 107]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -5820,14 +6017,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 104]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -5855,6 +6044,14 @@ Internet-Draft Brotli December 2015
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 108]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -5876,14 +6073,6 @@ Internet-Draft Brotli December 2015
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-
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 105]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -5911,6 +6100,14 @@ Internet-Draft Brotli December 2015
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+
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+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 109]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -5932,14 +6129,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 106]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -5967,6 +6156,14 @@ Internet-Draft Brotli December 2015
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+
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+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 110]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -5988,14 +6185,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 107]
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-Internet-Draft Brotli December 2015
-
-
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@@ -6023,6 +6212,14 @@ Internet-Draft Brotli December 2015
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+
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+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 111]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -6044,14 +6241,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 108]
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-Internet-Draft Brotli December 2015
-
-
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@@ -6079,6 +6268,14 @@ Internet-Draft Brotli December 2015
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 112]
+
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@@ -6100,14 +6297,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 109]
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-Internet-Draft Brotli December 2015
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-
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@@ -6135,6 +6324,14 @@ Internet-Draft Brotli December 2015
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 113]
+
+Internet-Draft Brotli April 2016
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+
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@@ -6156,14 +6353,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 110]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -6191,6 +6380,14 @@ Internet-Draft Brotli December 2015
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+
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 114]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -6212,14 +6409,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 111]
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-Internet-Draft Brotli December 2015
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-
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+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 115]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -6268,14 +6465,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 112]
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-Internet-Draft Brotli December 2015
-
-
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@@ -6303,6 +6492,14 @@ Internet-Draft Brotli December 2015
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 116]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -6324,14 +6521,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 113]
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-Internet-Draft Brotli December 2015
-
-
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@@ -6359,6 +6548,14 @@ Internet-Draft Brotli December 2015
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 117]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -6380,14 +6577,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 114]
-
-Internet-Draft Brotli December 2015
-
-
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@@ -6415,6 +6604,14 @@ Internet-Draft Brotli December 2015
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+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 118]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -6436,14 +6633,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 115]
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-Internet-Draft Brotli December 2015
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-
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@@ -6471,6 +6660,14 @@ Internet-Draft Brotli December 2015
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+
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+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 119]
+
+Internet-Draft Brotli April 2016
+
+
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@@ -6492,14 +6689,6 @@ Internet-Draft Brotli December 2015
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 116]
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-Internet-Draft Brotli December 2015
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-
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@@ -6527,6 +6716,14 @@ Internet-Draft Brotli December 2015
bit-depth array:
NDBITS := 0, 0, 0, 0, 10, 10, 11, 11, 10, 10,
+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 120]
+
+Internet-Draft Brotli April 2016
+
+
10, 10, 10, 9, 9, 8, 7, 7, 8, 7,
7, 6, 6, 5, 5
@@ -6548,14 +6745,6 @@ zlib CRC is 0x3d965f81.
ID Prefix Transform Suffix
-- ------ --------- ------
-
-
-
-Alakuijala & Szabadka Expires June 10, 2016 [Page 117]
-
-Internet-Draft Brotli December 2015
-
-
0 "" Identity ""
1 "" Identity " "
2 " " Identity " "
@@ -6583,6 +6772,14 @@ Internet-Draft Brotli December 2015
24 "" Identity "]"
25 "" Identity " for "
26 "" OmitFirst3 ""
+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 121]
+
+Internet-Draft Brotli April 2016
+
+
27 "" OmitLast2 ""
28 "" Identity " a "
29 "" Identity " that "
@@ -6604,14 +6801,6 @@ Internet-Draft Brotli December 2015
45 "" Identity " on "
46 "" Identity " as "
47 "" Identity " is "
-
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 118]
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-Internet-Draft Brotli December 2015
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48 "" OmitLast7 ""
49 "" OmitLast1 "ing "
50 "" Identity "\n\t"
@@ -6639,6 +6828,14 @@ Internet-Draft Brotli December 2015
72 ".com/" Identity ""
73 " the " Identity " of the "
74 "" UppercaseFirst "'"
+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 122]
+
+Internet-Draft Brotli April 2016
+
+
75 "" Identity ". This "
76 "" Identity ","
77 "." Identity " "
@@ -6660,14 +6857,6 @@ Internet-Draft Brotli December 2015
93 "" Identity "less "
94 "" UppercaseAll "'"
95 "" Identity "est "
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-Alakuijala & Szabadka Expires June 10, 2016 [Page 119]
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-Internet-Draft Brotli December 2015
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96 " " UppercaseFirst "."
97 "" UppercaseAll "\">"
98 " " Identity "='"
@@ -6695,6 +6884,14 @@ Internet-Draft Brotli December 2015
120 " " UppercaseFirst "='"
+
+
+
+Alakuijala & Szabadka Expires October 19, 2016 [Page 123]
+
+Internet-Draft Brotli April 2016
+
+
Authors' Addresses
Jyrki Alakuijala
@@ -6719,5 +6916,32 @@ Authors' Addresses
-Alakuijala & Szabadka Expires June 10, 2016 [Page 120]
+
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+Alakuijala & Szabadka Expires October 19, 2016 [Page 124]