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//===--- 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;
using namespace llvm::compression;
#if LLVM_ENABLE_ZLIB
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; }
void zlib::compress(ArrayRef<uint8_t> Input,
SmallVectorImpl<uint8_t> &CompressedBuffer, int Level) {
unsigned long CompressedSize = ::compressBound(Input.size());
CompressedBuffer.resize_for_overwrite(CompressedSize);
int Res = ::compress2((Bytef *)CompressedBuffer.data(), &CompressedSize,
(const Bytef *)Input.data(), Input.size(), Level);
if (Res == Z_MEM_ERROR)
report_bad_alloc_error("Allocation failed");
assert(Res == Z_OK);
// 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);
if (CompressedSize < CompressedBuffer.size())
CompressedBuffer.truncate(CompressedSize);
}
Error zlib::uncompress(ArrayRef<uint8_t> Input, uint8_t *UncompressedBuffer,
size_t &UncompressedSize) {
int Res =
::uncompress((Bytef *)UncompressedBuffer, (uLongf *)&UncompressedSize,
(const Bytef *)Input.data(), Input.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 ? make_error<StringError>(convertZlibCodeToString(Res),
inconvertibleErrorCode())
: Error::success();
}
Error zlib::uncompress(ArrayRef<uint8_t> Input,
SmallVectorImpl<uint8_t> &UncompressedBuffer,
size_t UncompressedSize) {
UncompressedBuffer.resize_for_overwrite(UncompressedSize);
Error E =
zlib::uncompress(Input, UncompressedBuffer.data(), UncompressedSize);
if (UncompressedSize < UncompressedBuffer.size())
UncompressedBuffer.truncate(UncompressedSize);
return E;
}
#else
bool zlib::isAvailable() { return false; }
void zlib::compress(ArrayRef<uint8_t> Input,
SmallVectorImpl<uint8_t> &CompressedBuffer, int Level) {
llvm_unreachable("zlib::compress is unavailable");
}
Error zlib::uncompress(ArrayRef<uint8_t> Input, uint8_t *UncompressedBuffer,
size_t &UncompressedSize) {
llvm_unreachable("zlib::uncompress is unavailable");
}
Error zlib::uncompress(ArrayRef<uint8_t> Input,
SmallVectorImpl<uint8_t> &UncompressedBuffer,
size_t UncompressedSize) {
llvm_unreachable("zlib::uncompress is unavailable");
}
#endif
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