Update google-code links in README.md #9
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Hi, Thanks for your PR. The README has been changed independently, so I'm closing this. I'm not particularly interested in pet changes to the build system—everybody has their favorite, and as an end user, I find CMake's UI horrible. :-) |
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Feb 22, 2017
The commit 8bfb028 (Improve zippy decompression speed) introduce a crash when snappy is compiled with _FORTIFY_SOURCE with musl libc. Backtrace reveals that it it comes from using memcpy with overlap, which is undefined behavior. We avoid the undefined behavior due to memcpy with overlap by using a temporary uint64_t. Bactrace from core dump created with `make check`: ```` (gdb) bt #0 memcpy (__n=8, __os=0xb38c8367eea, __od=0xb38c8367eeb) at /usr/include/fortify/string.h:48 google#1 snappy::(anonymous namespace)::UnalignedCopy64 (src=0xb38c8367eea, dst=0xb38c8367eeb) at snappy.cc:92 google#2 0x00006fb4c7c31717 in snappy::(anonymous namespace)::IncrementalCopy ( buf_limit=0xb38c8380ee0 "", op_limit=<optimized out>, op=<optimized out>, src=0xb38c8367eea " .\001") at snappy.cc:178 google#3 snappy::SnappyArrayWriter::AppendFromSelf (len=<optimized out>, offset=<optimized out>, this=<synthetic pointer>) at snappy.cc:1131 google#4 snappy::SnappyDecompressor::DecompressAllTags<snappy::SnappyArrayWriter> ( writer=<synthetic pointer>, this=0x7f1d26737050) at snappy.cc:715 google#5 snappy::InternalUncompressAllTags<snappy::SnappyArrayWriter> ( uncompressed_len=<optimized out>, writer=<synthetic pointer>, decompressor=0x7f1d26737050) at snappy.cc:799 google#6 snappy::InternalUncompress<snappy::SnappyArrayWriter> ( writer=<synthetic pointer>, r=0x7f1d26737000) at snappy.cc:789 google#7 snappy::RawUncompress (compressed=compressed@entry=0x7f1d267370c0, uncompressed=0xb38c8367ee0 " content: .\001") at snappy.cc:1149 google#8 0x00006fb4c7c3194d in snappy::RawUncompress (compressed=<optimized out>, n=<optimized out>, uncompressed=<optimized out>) at snappy.cc:1144 google#9 0x00000b38c5c6261a in snappy::BM_UFlat (iters=99, arg=<optimized out>) at snappy_unittest.cc:1371 google#10 0x00000b38c5c69846 in snappy::Benchmark::Run (this=0xb38c8323c40) at snappy-test.cc:192 google#11 0x00000b38c5c5f3fd in RunSpecifiedBenchmarks () at snappy-test.h:485 google#12 main (argc=1, argv=0x7f1d267374b8) at snappy_unittest.cc:1515 ```` Signed-off-by: Natanael Copa <natanael.copa@docker.com>
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Also, you could update the link in the https://github.com/google/snappy description field from https://code.google.com/p/snappy/ to https://google.github.io/snappy/
I have another question which I'm asking here because there are no 'Issues' on github/google/snappy:
I'm adding CMake support to snappy. Let me know if you're willing to accept a PR about this.