include/llvm/Support/Compression.h

   1 //===-- llvm/Support/Compression.h ---Compression----------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file contains basic functions for compression/uncompression.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_SUPPORT_COMPRESSION_H
  14 #define LLVM_SUPPORT_COMPRESSION_H
  15
  16 #include "llvm/Support/DataTypes.h"
  17
  18 namespace llvm {
  19 template <typename T> class SmallVectorImpl;
  20 class Error;
  21 class StringRef;
  22
  23 namespace zlib {
  24
  25 static constexpr int NoCompression = 0;
  26 static constexpr int BestSpeedCompression = 1;
  27 static constexpr int DefaultCompression = 6;
  28 static constexpr int BestSizeCompression = 9;
  29
  30 bool isAvailable();
  31
  32 Error compress(StringRef InputBuffer, SmallVectorImpl<char> &CompressedBuffer,
  33                int Level = DefaultCompression);
  34
  35 Error uncompress(StringRef InputBuffer, char *UncompressedBuffer,
  36                  size_t &UncompressedSize);
  37
  38 Error uncompress(StringRef InputBuffer,
  39                  SmallVectorImpl<char> &UncompressedBuffer,
  40                  size_t UncompressedSize);
  41
  42 uint32_t crc32(StringRef Buffer);
  43
  44 }  // End of namespace zlib
  45
  46 } // End of namespace llvm
  47
  48 #endif