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cb9ede7cd2
No any changes, will follow up with D28807 commit containing APLi change for clang to fix build issues happened. Original commit message: [Support/Compression] - Change zlib API to return Error instead of custom status. Previously API returned custom enum values. Patch changes it to return Error with string description. That should help users to report errors in universal way. Differential revision: https://reviews.llvm.org/D28684 llvm-svn: 292226
122 lines
4.3 KiB
C++
122 lines
4.3 KiB
C++
//===--- Compression.cpp - Compression implementation ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements compression functions.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Compression.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Config/config.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/ErrorHandling.h"
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#if LLVM_ENABLE_ZLIB == 1 && HAVE_ZLIB_H
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#include <zlib.h>
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#endif
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using namespace llvm;
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#if LLVM_ENABLE_ZLIB == 1 && HAVE_LIBZ
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static Error createError(StringRef Err) {
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return make_error<StringError>(Err, inconvertibleErrorCode());
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}
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static int encodeZlibCompressionLevel(zlib::CompressionLevel Level) {
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switch (Level) {
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case zlib::NoCompression: return 0;
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case zlib::BestSpeedCompression: return 1;
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case zlib::DefaultCompression: return Z_DEFAULT_COMPRESSION;
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case zlib::BestSizeCompression: return 9;
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}
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llvm_unreachable("Invalid zlib::CompressionLevel!");
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}
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static StringRef convertZlibCodeToString(int Code) {
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switch (Code) {
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case Z_MEM_ERROR:
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return "zlib error: Z_MEM_ERROR";
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case Z_BUF_ERROR:
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return "zlib error: Z_BUF_ERROR";
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case Z_STREAM_ERROR:
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return "zlib error: Z_STREAM_ERROR";
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case Z_DATA_ERROR:
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return "zlib error: Z_DATA_ERROR";
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case Z_OK:
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default:
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llvm_unreachable("unknown or unexpected zlib status code");
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}
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}
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bool zlib::isAvailable() { return true; }
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Error zlib::compress(StringRef InputBuffer,
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SmallVectorImpl<char> &CompressedBuffer,
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CompressionLevel Level) {
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unsigned long CompressedSize = ::compressBound(InputBuffer.size());
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CompressedBuffer.resize(CompressedSize);
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int CLevel = encodeZlibCompressionLevel(Level);
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int Res = ::compress2((Bytef *)CompressedBuffer.data(), &CompressedSize,
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(const Bytef *)InputBuffer.data(), InputBuffer.size(),
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CLevel);
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// Tell MemorySanitizer that zlib output buffer is fully initialized.
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// This avoids a false report when running LLVM with uninstrumented ZLib.
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__msan_unpoison(CompressedBuffer.data(), CompressedSize);
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CompressedBuffer.resize(CompressedSize);
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return Res ? createError(convertZlibCodeToString(Res)) : Error::success();
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}
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Error zlib::uncompress(StringRef InputBuffer, char *UncompressedBuffer,
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size_t &UncompressedSize) {
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int Res =
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::uncompress((Bytef *)UncompressedBuffer, (uLongf *)&UncompressedSize,
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(const Bytef *)InputBuffer.data(), InputBuffer.size());
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// Tell MemorySanitizer that zlib output buffer is fully initialized.
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// This avoids a false report when running LLVM with uninstrumented ZLib.
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__msan_unpoison(UncompressedBuffer, UncompressedSize);
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return Res ? createError(convertZlibCodeToString(Res)) : Error::success();
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}
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Error zlib::uncompress(StringRef InputBuffer,
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SmallVectorImpl<char> &UncompressedBuffer,
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size_t UncompressedSize) {
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UncompressedBuffer.resize(UncompressedSize);
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Error E =
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uncompress(InputBuffer, UncompressedBuffer.data(), UncompressedSize);
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UncompressedBuffer.resize(UncompressedSize);
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return E;
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}
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uint32_t zlib::crc32(StringRef Buffer) {
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return ::crc32(0, (const Bytef *)Buffer.data(), Buffer.size());
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}
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#else
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bool zlib::isAvailable() { return false; }
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Error zlib::compress(StringRef InputBuffer,
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SmallVectorImpl<char> &CompressedBuffer,
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CompressionLevel Level) {
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llvm_unreachable("zlib::compress is unavailable");
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}
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Error zlib::uncompress(StringRef InputBuffer, char *UncompressedBuffer,
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size_t &UncompressedSize) {
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llvm_unreachable("zlib::uncompress is unavailable");
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}
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Error zlib::uncompress(StringRef InputBuffer,
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SmallVectorImpl<char> &UncompressedBuffer,
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size_t UncompressedSize) {
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llvm_unreachable("zlib::uncompress is unavailable");
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}
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uint32_t zlib::crc32(StringRef Buffer) {
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llvm_unreachable("zlib::crc32 is unavailable");
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}
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#endif
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