src/llvm/include/llvm/Support/Compression.h

   1 //===-- llvm/Support/Compression.h ---Compression----------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file contains basic functions for compression/uncompression.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_SUPPORT_COMPRESSION_H
  15 #define LLVM_SUPPORT_COMPRESSION_H
  16
  17 #include "llvm/ADT/SmallVector.h"
  18 #include "llvm/Support/DataTypes.h"
  19 #include <memory>
  20
  21 namespace llvm {
  22
  23 class StringRef;
  24
  25 namespace zlib {
  26
  27 enum CompressionLevel {
  28   NoCompression,
  29   DefaultCompression,
  30   BestSpeedCompression,
  31   BestSizeCompression
  32 };
  33
  34 enum Status {
  35   StatusOK,
  36   StatusUnsupported,    // zlib is unavailable
  37   StatusOutOfMemory,    // there was not enough memory
  38   StatusBufferTooShort, // there was not enough room in the output buffer
  39   StatusInvalidArg,     // invalid input parameter
  40   StatusInvalidData     // data was corrupted or incomplete
  41 };
  42
  43 bool isAvailable();
  44
  45 Status compress(StringRef InputBuffer, SmallVectorImpl<char> &CompressedBuffer,
  46                 CompressionLevel Level = DefaultCompression);
  47
  48 Status uncompress(StringRef InputBuffer,
  49                   SmallVectorImpl<char> &UncompressedBuffer,
  50                   size_t UncompressedSize);
  51
  52 uint32_t crc32(StringRef Buffer);
  53
  54 }  // End of namespace zlib
  55
  56 } // End of namespace llvm
  57
  58 #endif
  59