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3ccbf05d
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2016-06-13T11:01:04
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Convert encoder to plain C.
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986aa099
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2016-06-14T13:42:47
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Fix VS compilation warnings; cleanup API.
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58a3023e
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2016-06-03T11:19:23
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Transform most of C++ comments to C-style.
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f1c9ab29
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2016-06-03T10:51:04
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Extract common parts: constants, dictionary, etc.
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be1a53a6
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2016-06-14T13:42:47
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Fix VS compilation warnings; cleanup API.
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b972c677
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2016-06-13T11:01:04
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Convert encoder to plain C.
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352b0b28
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2016-06-03T11:19:23
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Transform most of C++ comments to C-style.
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02829186
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2016-06-03T10:51:04
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Extract common parts: constants, dictionary, etc.
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226d21c4
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2016-05-18T11:01:16
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Make encoder API more safe
Add flag to check if "last" block has been already processed
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b820c39b
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2016-03-15T10:50:16
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Reduce memory usage of brotli encoder at quality 10 and 11.
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25e3796f
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2016-02-29T14:41:24
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Fix most of ()->(void) and some missing includes.
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dbb53e64
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2016-01-27T09:50:39
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Use a hash-to-binary-tree data structure for quality 11 as suggested by Issue #180.
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82c9e197
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2016-01-12T14:45:35
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Relax the prerequisites of WriteBrotliData().
Instead of returning false, if it is called with no
new input for a non-last block, just check if it has
any already processed data to flush, and if not,
return true with empty output.
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417107b3
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2016-01-11T11:21:42
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Add two more fast modes to the brotli compressor.
The new modes process the input data in independent blocks,
using backward references only from within an input block.
The new modes can be used by specifying quality 0 or quality 1,
the old quality 1 and quality 2 modes are renamed quality 2 and
quality 3, respectively, and the old quality 3 mode is removed.
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8844b7f0
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2016-01-07T16:27:49
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Fix more conversion warnings.
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24ffa784
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2015-12-11T11:11:51
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Fix headers
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771eb107
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2015-11-27T11:27:11
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Update license statement in source files.
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152e33c3
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2015-11-17T13:45:41
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Add more explicit type conversions.
Remove dead code.
Fix includes.
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ea48ce5a
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2015-10-28T17:44:47
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Fix --Wconversion and --pedantic-erros for the encoder.
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a89b57b9
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2015-10-26T17:08:57
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Use uint32_t positions in the hasher and compute distances modulo 2^32.
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754deaed
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2015-10-01T17:08:59
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Reduce command buffer memory usage.
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4c37566f
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2015-10-01T15:10:42
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Move literal cost computation to where it's used.
Move utf8 heuristics functions to their own file.
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4a7024dc
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2015-10-01T12:08:14
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Make the brotli encoder C++98 compatible.
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6511d6b0
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2015-08-28T16:09:23
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update brotli encoder with latest improvements
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618287b3
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2015-06-12T16:50:49
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Deprecate greedy_block_split and enable_context_modeling brotli params.
These affected only quality 11, and now it does not make sense
to disable block splitting or context modeling because most of
the time is spent in zopfli anyway.
Now all speed vs size compromises are controlled by the quality param.
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66098830
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2015-06-12T16:45:17
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Use a static hash table to look up dictionary words and transforms.
This is used for quality 11, for qualities <= 9 we already
have a simpler hash table.
The static data size is 252 kB, and this removes the
need to initialize a huge hash map at startup, which was
the reason why transforms had to be disabled by default.
In comparison, the static dictionary itself is 120 kB.
This supports every transform, except the kOmitFirstN.
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65f3fc55
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2015-06-12T16:11:50
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Bug fixes for the brotli encoder.
* Fix an out-of-bounds access to depth_histo in the
bit cost calculation function.
* Change type of distance symbol to uint16_t in block
splitter, because if all postfix bits are used, there
can be 520 distance symbols.
* Save the distance cache between meta-blocks at the
correct place. This fixes a roundtrip failure that
can occur when there is an uncompressed metablock
between two compressed metablocks.
* Fix a bug when setting lgwin to 24 in the encoder parameters
It ended up making metablocks larger than 24 bits in size.
* Fix out-of-bounds memory accesses in parallel encoder.
CreateBackwardReferences can read up to 4 bytes past end of
input if the end of input is before mask.
* Add missing header for memcpy() in port.h
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b43df8f6
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2015-06-12T15:43:54
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Brotli custom LZ77 dictionary support.
Adds functions to prepend such dictionary to the
encoder and decoder, and twiddles their internal
parameters to do as if that was a previous part of
the input. This dictionary is just a prefilled LZ77
window, it is not related to the built in transformable
brotli dictionary.
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aa853f3c
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2015-05-11T11:33:19
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Add a MODE_GENERIC compression mode to the interface.
With this the users can distinguish between not knowing
what the input is (ddefault) and knowing that it is text,
and thus can be relied on to force some UTF-8 specific settings.
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0f726df1
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2015-04-28T10:12:47
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Don't do any block splitting for quality 1.
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98539223
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2015-04-23T16:20:29
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Remove quality parameter from bitstream writing functions.
Fix a few crashes related to some quality and param combinations.
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2fd80cdc
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2015-04-23T15:43:37
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Encoder support for new empty meta-block format.
Changed the parallel implementation to sync meta-blocks
to byte boundary by emitting empty meta-blocks.
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3dbe2e03
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2015-04-23T15:26:08
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Encoder implementation using input/output classes.
Add a BrotliCompress() method to the public encoder API
that uses the BrotliIn and BrotliOut classes and use
that in the 'bro' command-line tool.
Use the streaming api in BrotliCompressBuffer() and
BrotliCompressor::WriteMetaBlock().
Use the appropiate hashers for quality <= 9.
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89a6fb85
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2015-04-23T13:15:42
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Add params to disable static dictionary and context modeling.
Disable all slow features for quality <= 9 (literal cost modeling,
dictionary, context modeling, advanced block splitting).
Change vector<Command> arguments of internal functions
to Command* and size_t.
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e377e65f
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2015-04-02T11:12:04
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Limit the max input meta-block size to 16MB.
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817a3edd
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2015-04-01T16:29:04
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Add an input block size parameter to brotli.
This will enable processing the input in smaller
chunks than the currently default 2MB for the
slow brotli, while still benefiting from the
larger sliding window.
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d6d69ec4
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2015-04-01T16:10:15
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Add quality and lgwin to the BrotliParams.
Remove the hard-coded constants for window size
and meta-block size.
Initialize internal storage for each metablock
separately and reserve only as much as needed
for the actual input.
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534654de
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2015-03-27T14:20:35
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Add a faster but less dense compression mode.
The new mode can be used by setting the greedy_block_split
field of BrotliParams to true.
This commit moves all the meta-block processing code
into its own library and moves the meta-block encoding
code to brotli_bit_stream.cc from encode.cc
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96d04e53
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2014-10-29T15:39:35
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Disable transforms in the encoder by default.
This change reduces the startup-time of the encoder considerably.
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485ad82e
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2014-10-28T14:05:53
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Fix potential output buffer overflow in encoder.
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b4f39bf5
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2014-10-28T13:25:22
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New version of the backward reference search code.
The new interface of the backward reference search
function makes it possible to use it in a streaming
manner.
Using the advanced cost model and static dictionary
can be turned on/off by template parameters.
The distance short codes are now computed as part of
the backward reference search.
Added a faster version of the Hasher.
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d6d9fc60
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2014-10-15T14:01:36
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Factor out serialization functions into their own file.
Create a brotli_bit_stream library that is responsible for writing
various structures (headers, Huffman codes, etc.) directly into the
bit-stream.
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e7650080
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2014-03-20T14:32:35
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Updates to Brotli compression format, decoder and encoder
This commit contains a batch of changes that were made to the Brotli
compression algorithm in the last month. Most important changes:
* Format change: don't push distances representing static dictionary words to the distance cache.
* Fix decoder invalid memory access bug caused by building a non-complete Huffman tree.
* Add a mode parameter to the encoder interface.
* Use different hashers for text and font mode.
* Add a heuristics to the hasher for skipping non-compressible data.
* Exhaustive search of static dictionary during backward reference search.
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2f268ad1
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2014-02-17T14:25:36
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Add the initial version of the static dictionary and transforms to Brotli.
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60c24c0c
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2013-12-12T13:18:04
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Updates to Brotli compression format, decoder and encoder
This commit contains a batch of changes that were made to the Brotli
compression algorithm in the last month. Most important changes:
* Updated spec
* Changed Huffman code length alphabet to use run length codes more
efficiently, based on a suggestion by Robert Obryk
* Changed encoding of the number of Huffman code lengths (HLEN)
* Changed encoding of the number of Huffman trees (NTREES)
* Added support for uncompressed meta-blocks
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1cdcbd85
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2013-11-19T14:32:56
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Added Brotli compress/decompress utilities and makefiles
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c6b9c7c5
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2013-11-15T19:02:17
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Updates to Brotli compression format, decoder and encoder
This commit contains a batch of changes that were made to the Brotli
compression algorithm in the last three weeks. Most important changes:
* Added UTF8 context model for good text compression.
* Simplified context modeling by having only 4 context modes.
* Per-block context mode selection.
* Faster backward copying and bit reading functions.
* More efficient histogram coding.
* Streaming support for the decoder and encoder.
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c66e4e3e
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2013-10-23T13:06:13
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Add brotli compressor
This commit is for the encoder for brotli compression format.
Brotli is a generic byte-level compression algorithm.
|