mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-01 00:11:00 +00:00
df93f4bb0b
NFC. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232976 91177308-0d34-0410-b5e6-96231b3b80d8
100 lines
3.7 KiB
C++
100 lines
3.7 KiB
C++
//===--- Compression.cpp - Compression implementation ---------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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/ErrorHandling.h"
|
|
#if LLVM_ENABLE_ZLIB == 1 && HAVE_ZLIB_H
|
|
#include <zlib.h>
|
|
#endif
|
|
|
|
using namespace llvm;
|
|
|
|
#if LLVM_ENABLE_ZLIB == 1 && HAVE_LIBZ
|
|
static int encodeZlibCompressionLevel(zlib::CompressionLevel Level) {
|
|
switch (Level) {
|
|
case zlib::NoCompression: return 0;
|
|
case zlib::BestSpeedCompression: return 1;
|
|
case zlib::DefaultCompression: return Z_DEFAULT_COMPRESSION;
|
|
case zlib::BestSizeCompression: return 9;
|
|
}
|
|
llvm_unreachable("Invalid zlib::CompressionLevel!");
|
|
}
|
|
|
|
static zlib::Status encodeZlibReturnValue(int ReturnValue) {
|
|
switch (ReturnValue) {
|
|
case Z_OK: return zlib::StatusOK;
|
|
case Z_MEM_ERROR: return zlib::StatusOutOfMemory;
|
|
case Z_BUF_ERROR: return zlib::StatusBufferTooShort;
|
|
case Z_STREAM_ERROR: return zlib::StatusInvalidArg;
|
|
case Z_DATA_ERROR: return zlib::StatusInvalidData;
|
|
default: llvm_unreachable("unknown zlib return status!");
|
|
}
|
|
}
|
|
|
|
bool zlib::isAvailable() { return true; }
|
|
zlib::Status zlib::compress(StringRef InputBuffer,
|
|
SmallVectorImpl<char> &CompressedBuffer,
|
|
CompressionLevel Level) {
|
|
unsigned long CompressedSize = ::compressBound(InputBuffer.size());
|
|
CompressedBuffer.resize(CompressedSize);
|
|
int CLevel = encodeZlibCompressionLevel(Level);
|
|
Status Res = encodeZlibReturnValue(::compress2(
|
|
(Bytef *)CompressedBuffer.data(), &CompressedSize,
|
|
(const Bytef *)InputBuffer.data(), InputBuffer.size(), CLevel));
|
|
// 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.resize(CompressedSize);
|
|
return Res;
|
|
}
|
|
|
|
zlib::Status zlib::uncompress(StringRef InputBuffer,
|
|
SmallVectorImpl<char> &UncompressedBuffer,
|
|
size_t UncompressedSize) {
|
|
UncompressedBuffer.resize(UncompressedSize);
|
|
Status Res = encodeZlibReturnValue(::uncompress(
|
|
(Bytef *)UncompressedBuffer.data(), (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.data(), UncompressedSize);
|
|
UncompressedBuffer.resize(UncompressedSize);
|
|
return Res;
|
|
}
|
|
|
|
uint32_t zlib::crc32(StringRef Buffer) {
|
|
return ::crc32(0, (const Bytef *)Buffer.data(), Buffer.size());
|
|
}
|
|
|
|
#else
|
|
bool zlib::isAvailable() { return false; }
|
|
zlib::Status zlib::compress(StringRef InputBuffer,
|
|
SmallVectorImpl<char> &CompressedBuffer,
|
|
CompressionLevel Level) {
|
|
return zlib::StatusUnsupported;
|
|
}
|
|
zlib::Status zlib::uncompress(StringRef InputBuffer,
|
|
SmallVectorImpl<char> &UncompressedBuffer,
|
|
size_t UncompressedSize) {
|
|
return zlib::StatusUnsupported;
|
|
}
|
|
uint32_t zlib::crc32(StringRef Buffer) {
|
|
llvm_unreachable("zlib::crc32 is unavailable");
|
|
}
|
|
#endif
|
|
|