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Add a lower level zlib::uncompress.

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SmallVectors are convenient, but they don't cover every use case.

In particular, they are fairly large (3 pointers + one element) and
there is no way to take ownership of the buffer to put it somewhere
else.  This patch then adds a lower lever interface that works with
any buffer.

llvm-svn: 281082
This commit is contained in:
Rafael Espindola
2016-09-09 19:32:36 +00:00
parent 06f8d39424
commit 46cdcb03ed
2 changed files with 16 additions and 6 deletions
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19
llvm/lib/Support/Compression.cpp
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@@ -62,16 +62,23 @@ zlib::Status zlib::compress(StringRef InputBuffer,
return Res;
}
zlib::Status zlib::uncompress(StringRef InputBuffer, char *UncompressedBuffer,
size_t &UncompressedSize) {
Status Res = encodeZlibReturnValue(
::uncompress((Bytef *)UncompressedBuffer, (uLongf *)&UncompressedSize,
(const Bytef *)InputBuffer.data(), InputBuffer.size()));
// Tell MemorySanitizer that zlib output buffer is fully initialized.
// This avoids a false report when running LLVM with uninstrumented ZLib.
__msan_unpoison(UncompressedBuffer, UncompressedSize);
return Res;
}
zlib::Status zlib::uncompress(StringRef InputBuffer,
SmallVectorImpl<char> &UncompressedBuffer,
size_t UncompressedSize) {
UncompressedBuffer.resize(UncompressedSize);
Status Res = encodeZlibReturnValue(::uncompress(
(Bytef *)UncompressedBuffer.data(), (uLongf *)&UncompressedSize,
(const Bytef *)InputBuffer.data(), InputBuffer.size()));
// Tell MemorySanitizer that zlib output buffer is fully initialized.
// This avoids a false report when running LLVM with uninstrumented ZLib.
__msan_unpoison(UncompressedBuffer.data(), UncompressedSize);
Status Res =
uncompress(InputBuffer, UncompressedBuffer.data(), UncompressedSize);
UncompressedBuffer.resize(UncompressedSize);
return Res;
}