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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