| //===--- Compression.cpp - Compression implementation ---------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements compression functions. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/Support/Compression.h" |
| #include "llvm/ADT/SmallVector.h" |
| #include "llvm/ADT/StringRef.h" |
| #include "llvm/Config/config.h" |
| #include "llvm/Support/Compiler.h" |
| #include "llvm/Support/Error.h" |
| #include "llvm/Support/ErrorHandling.h" |
| #if LLVM_ENABLE_ZLIB |
| #include <zlib.h> |
| #endif |
| |
| using namespace llvm; |
| |
| #if LLVM_ENABLE_ZLIB |
| static Error createError(StringRef Err) { |
| return make_error<StringError>(Err, inconvertibleErrorCode()); |
| } |
| |
| static StringRef convertZlibCodeToString(int Code) { |
| switch (Code) { |
| case Z_MEM_ERROR: |
| return "zlib error: Z_MEM_ERROR"; |
| case Z_BUF_ERROR: |
| return "zlib error: Z_BUF_ERROR"; |
| case Z_STREAM_ERROR: |
| return "zlib error: Z_STREAM_ERROR"; |
| case Z_DATA_ERROR: |
| return "zlib error: Z_DATA_ERROR"; |
| case Z_OK: |
| default: |
| llvm_unreachable("unknown or unexpected zlib status code"); |
| } |
| } |
| |
| bool zlib::isAvailable() { return true; } |
| |
| Error zlib::compress(StringRef InputBuffer, |
| SmallVectorImpl<char> &CompressedBuffer, int Level) { |
| unsigned long CompressedSize = ::compressBound(InputBuffer.size()); |
| CompressedBuffer.reserve(CompressedSize); |
| int Res = |
| ::compress2((Bytef *)CompressedBuffer.data(), &CompressedSize, |
| (const Bytef *)InputBuffer.data(), InputBuffer.size(), Level); |
| // Tell MemorySanitizer that zlib output buffer is fully initialized. |
| // This avoids a false report when running LLVM with uninstrumented ZLib. |
| __msan_unpoison(CompressedBuffer.data(), CompressedSize); |
| CompressedBuffer.set_size(CompressedSize); |
| return Res ? createError(convertZlibCodeToString(Res)) : Error::success(); |
| } |
| |
| Error zlib::uncompress(StringRef InputBuffer, char *UncompressedBuffer, |
| size_t &UncompressedSize) { |
| int Res = |
| ::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 ? createError(convertZlibCodeToString(Res)) : Error::success(); |
| } |
| |
| Error zlib::uncompress(StringRef InputBuffer, |
| SmallVectorImpl<char> &UncompressedBuffer, |
| size_t UncompressedSize) { |
| UncompressedBuffer.reserve(UncompressedSize); |
| Error E = |
| uncompress(InputBuffer, UncompressedBuffer.data(), UncompressedSize); |
| UncompressedBuffer.set_size(UncompressedSize); |
| return E; |
| } |
| |
| uint32_t zlib::crc32(StringRef Buffer) { |
| return ::crc32(0, (const Bytef *)Buffer.data(), Buffer.size()); |
| } |
| |
| #else |
| bool zlib::isAvailable() { return false; } |
| Error zlib::compress(StringRef InputBuffer, |
| SmallVectorImpl<char> &CompressedBuffer, int Level) { |
| llvm_unreachable("zlib::compress is unavailable"); |
| } |
| Error zlib::uncompress(StringRef InputBuffer, char *UncompressedBuffer, |
| size_t &UncompressedSize) { |
| llvm_unreachable("zlib::uncompress is unavailable"); |
| } |
| Error zlib::uncompress(StringRef InputBuffer, |
| SmallVectorImpl<char> &UncompressedBuffer, |
| size_t UncompressedSize) { |
| llvm_unreachable("zlib::uncompress is unavailable"); |
| } |
| uint32_t zlib::crc32(StringRef Buffer) { |
| llvm_unreachable("zlib::crc32 is unavailable"); |
| } |
| #endif |