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Switch the internal member of the patch writer from a single compressor to a
list of compressors for ctrl|diff|extra streams. The change doesn't affect the
functionality of the existing bz2|brotli compressors; but later allow us to try
all the compressors and select the one with the best compression ratio.
With this new writer, callers will be able to produce the smallest patch without
calling bsdiff explictly multiple times.
Test: unit tests pass
Change-Id: I441ae6636e2299b2cfc9d14f50952c85585dbb4f
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Add a new BSDF2 format that allows compression of ctrl/diff/extra streams
with different algorithms. The compression algorithm supported for now is
bz2 and brotli. This new format is similar to the legacy "BSDIFF40" format
except for the magic headers.
File format:
0 8 magic header
8 8 X
16 8 Y
24 8 new_file_size
32 X compressed control block
32+X Y compressed diff block
32+X+Y ??? compressed extra block
The magic header for BSDF2 format:
0 5 BSDF2
5 1 compressed type for control stream
6 1 compressed type for diff stream
7 1 compressed type for extra stream
Bug: 34220646
Test: unittest pass
Change-Id: I6eb0867e88476dbc4a4b7be609783f8c8a0a41cd
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Add a new compressor interface; and the brotli compressor which is
similar to the existing bz2 one.
Also add a new CompressorType argument to PatchWriter's init function;
this allows us to choose the right compressor based on the input option
in the future.
Bug: 34220646
Test: Run bsdiff/bspatch with brotli compressor/decompressor over a
list of files from angler's system image. Make succeeds.
Change-Id: Id9a3db2d7d051dcb751a1fc362f4c3b9226e878b
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bsdiff.cc had code to handle both the sub-streams compression and the
patch format. This CL moves the patch file format logic to a new class
in a separated file, and the bzip2 compression to another class. This
allows to replace the core bsdiff logic separatedly from the patch
format.
There are no changes to the functionality of bsdiff and the generated
patches. The code does a bit more of memcpy() since it doesn't write
the control stream to disk as it goes.
Bug: 34220646
Test: Ran bsdiff and compared results with previous version.
Change-Id: Ibdc1482e98cbd370cbed677c326008e19a217ef8
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