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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
107 lines
3.8 KiB
C++
107 lines
3.8 KiB
C++
//===--- Compression.cpp - Compression implementation ---------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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 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, int Level) {
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unsigned long CompressedSize = ::compressBound(InputBuffer.size());
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CompressedBuffer.reserve(CompressedSize);
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int Res =
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::compress2((Bytef *)CompressedBuffer.data(), &CompressedSize,
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(const Bytef *)InputBuffer.data(), InputBuffer.size(), Level);
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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.set_size(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, int 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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