Compression.h

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//===-- llvm/Support/Compression.h ---Compression----------------*- C++ -*-===//
//
// 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 contains basic functions for compression/uncompression.
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_SUPPORT_COMPRESSION_H
#define LLVM_SUPPORT_COMPRESSION_H
 
#include "llvm/Support/DataTypes.h"
 
namespace llvm {
template <typename T> class SmallVectorImpl;
class Error;
class StringRef;
 
namespace zlib {
 
static constexpr int NoCompression = 0;
static constexpr int BestSpeedCompression = 1;
static constexpr int DefaultCompression = 6;
static constexpr int BestSizeCompression = 9;
 
bool isAvailable();
 
void compress(StringRef InputBuffer, SmallVectorImpl<char> &CompressedBuffer,
              int Level = DefaultCompression);
 
Error uncompress(StringRef InputBuffer, char *UncompressedBuffer,
                 size_t &UncompressedSize);
 
Error uncompress(StringRef InputBuffer,
                 SmallVectorImpl<char> &UncompressedBuffer,
                 size_t UncompressedSize);
 
uint32_t crc32(StringRef Buffer);
 
}  // End of namespace zlib
 
} // End of namespace llvm
 
#endif