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infback.c:200:13: runtime error: left shift of 255 by 24 places cannot be represented in type 'int'
624: SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /Users/runner/work/zlib-ng/zlib-ng/infback.c:200:13 in
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* Reintroduce support for ZLIB_CONST in compat mode.
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indent, initial function brace on the same line as definition, removed extraneous spaces and new lines.
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and infback.c, making actual differences much easier to spot, easing maintenance.
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This also reduces the library size by 4120bytes or ~2.9%.
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(#363)
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Based on a patch by Nigel Tao:
https://github.com/madler/zlib/pull/292/commits/e0ff1f330cc03ee04843f857869b4036593ab39d
This patch makes unzipping of files up to 1.2x faster on x86_64. The other part
(1.3x speedup) of the patch by Nigel Tao is unsafe as discussed in the review of
that pull request. zlib-ng already has a different way to optimize the memcpy
for that missing part.
The original patch was enabled only on little-endian machines. This patch adapts
the loading of 64 bits at a time to big endian machines.
Benchmarking notes from Hans Kristian Rosbach:
https://github.com/zlib-ng/zlib-ng/pull/224#issuecomment-444837182
Benchmark runs: 7, tested levels: 0-7, testfile 100M
develop at 796ad10 with -O3:
Level Comp Comptime min/avg/max Decomptime min/avg/max
0 100.02% 0.01/0.01/0.02 0.08/0.09/0.11
1 47.08% 0.49/0.50/0.51 0.37/0.39/0.40
2 36.02% 1.10/1.12/1.13 0.39/0.39/0.40
3 34.77% 1.32/1.34/1.37 0.38/0.38/0.38
4 33.41% 1.50/1.53/1.56 0.37/0.37/0.38
5 33.07% 1.85/1.87/1.90 0.36/0.37/0.38
6 32.83% 2.54/2.57/2.61 0.36/0.37/0.38
avg 45.31% 1.28 0.34
tot 62.60 16.58
PR224 with -O3:
Level Comp Comptime min/avg/max Decomptime min/avg/max
0 100.02% 0.01/0.01/0.02 0.09/0.09/0.10
1 47.08% 0.49/0.50/0.51 0.37/0.37/0.38
2 36.02% 1.09/1.11/1.13 0.38/0.38/0.39
3 34.77% 1.32/1.34/1.38 0.35/0.36/0.38
4 33.41% 1.49/1.52/1.54 0.36/0.36/0.37
5 33.07% 1.85/1.88/1.93 0.35/0.36/0.37
6 32.83% 2.55/2.58/2.65 0.35/0.35/0.36
avg 45.31% 1.28 0.33
tot 62.48 16.02
So I see about a 5.4% speedup on my x86_64 machine, not quite the 1.2x speedup
but a nice speedup nevertheless. This benchmark measures the total execution
time of minigzip, so that might have caused some inefficiencies.
At -O2, I only see a 2.7% speedup.
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* move definition of z_size_t to zbuild.h
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to co-exist in an application that has been linked to something that
depends on stock zlib. Previously, that would cause random problems
since there is no way to guarantee what zlib version is being used
for each dynamically linked function.
Add the corresponding zlib-ng.h.
Tests, example and minigzip will not compile before they have been
adapted to use the correct functions as well.
Either duplicate them, so we have minigzip-ng.c for example, or add
compile-time detection in the source code.
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* uInt -> unsigned int
* ulg -> unsigned long
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Based on upstream 7096424f23df1b1813237fb5f8bc8f34cfcedd0c, but
modified heavily to match zlib-ng.
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* local -> static
* Normalize and cleanup line-endings
* Fix warnings under Visual Studio.
* Whitespace cleanup
***
This patch has been edited to merge cleanly and to exclude type changes.
Based on 8d7a7c3b82c6e38734bd504dac800b148ab410d0 "Type Cleanup"
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This commit was cherry-picked and was not done, resulting in a few
problems with gcc on 64bit windows.
This reverts commit edd7a72e056b994458ff040d4740b16b35336b60.
Conflicts:
arch/x86/crc_folding.c
arch/x86/fill_window_sse.c
deflate.c
deflate.h
match.c
trees.c
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Conflicts:
inflate.h
inftrees.c
inftrees.h
match.c
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Signed-off-by: Daniel Axtens <dja@axtens.net>
Conflicts:
arch/x86/crc_folding.c
crc32.c
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Make compiling without gzip file operation support the default
(define WITH_GZFILEOP or use --zlib-compat to enable them).
Add initial support for compiling in a zlib-compatible mode, this currently only
enables gzip file operations and sets the ZLIB_COMPAT flag.
Conflicts:
test/minigzip.c
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Only internal functions, no exported functions in this commit.
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And a few Bytef leftovers from test/example.c
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-Removing usage of OF() definition
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Remove a few leftovers from the legacy OS support removal
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This patch allows zlib to compile cleanly with the -Wcast-qual gcc
warning enabled, but only if ZLIB_CONST is defined, which adds
const to next_in and msg in z_stream and in the in_func prototype.
A --const option is added to ./configure which adds -DZLIB_CONST
to the compile flags, and adds -Wcast-qual to the compile flags
when ZLIBGCCWARN is set in the environment.
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During coverage testing it was discovered that these two lines could
never pull more bits, since the immediately preceding for loop assures
that all of the code's bits are already pulled.
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A common request has been the ability to compile zlib to require no
other libraries. This --solo option provides that ability. The price
is that the gz*, compress*, and uncompress functions are eliminated,
and that the user must provide memory allocation and free routines to
deflate and inflate when initializing.
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