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      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
     49