6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-15 05:24:01 +00:00
Code Issues Projects Releases Wiki Activity

Simplify compression API by decompressing into a SmallVector rather than a MemoryBuffer

Browse Source 
This avoids an extra copy during decompression and avoids the use of
MemoryBuffer which is a weirdly esoteric device that includes unrelated
concepts like "file name" (its rather generic name is a bit misleading).

Similar refactoring of zlib::compress coming up.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205676 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie
2014-04-05 21:26:44 +00:00
parent 48ee81c679
commit b206103abc
5 changed files with 18 additions and 22 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
lib/Support/Compression.cpp
View File

@ -65,18 +65,13 @@ zlib::Status zlib::compress(StringRef InputBuffer,
}
zlib::Status zlib::uncompress(StringRef InputBuffer,
std::unique_ptr<MemoryBuffer> &UncompressedBuffer,
SmallVectorImpl<char> &UncompressedBuffer,
size_t UncompressedSize) {
std::unique_ptr<char[]> TmpBuffer(new char[UncompressedSize]);
Status Res = encodeZlibReturnValue(
::uncompress((Bytef *)TmpBuffer.get(), (uLongf *)&UncompressedSize,
(const Bytef *)InputBuffer.data(), InputBuffer.size()));
if (Res == StatusOK) {
UncompressedBuffer.reset(MemoryBuffer::getMemBufferCopy(
StringRef(TmpBuffer.get(), UncompressedSize)));
// Tell MSan that memory initialized by zlib is valid.
__msan_unpoison(UncompressedBuffer->getBufferStart(), UncompressedSize);
}
UncompressedBuffer.resize(UncompressedSize);
Status Res = encodeZlibReturnValue(::uncompress(
(Bytef *)UncompressedBuffer.data(), (uLongf *)&UncompressedSize,
(const Bytef *)InputBuffer.data(), InputBuffer.size()));
UncompressedBuffer.resize(UncompressedSize);
return Res;
}