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/Support/DataTypes.h"
18 
19 namespace llvm {
20 template <typename T> class SmallVectorImpl;
21 class Error;
22 class StringRef;
23 
24 namespace zlib {
25 
26 static constexpr int NoCompression = 0;
27 static constexpr int BestSpeedCompression = 1;
28 static constexpr int DefaultCompression = 6;
29 static constexpr int BestSizeCompression = 9;
30 
31 bool isAvailable();
32 
33 Error compress(StringRef InputBuffer, SmallVectorImpl<char> &CompressedBuffer,
34                int Level = DefaultCompression);
35 
36 Error uncompress(StringRef InputBuffer, char *UncompressedBuffer,
37                  size_t &UncompressedSize);
38 
39 Error uncompress(StringRef InputBuffer,
40                  SmallVectorImpl<char> &UncompressedBuffer,
41                  size_t UncompressedSize);
42 
43 uint32_t crc32(StringRef Buffer);
44 
45 }  // End of namespace zlib
46 
47 } // End of namespace llvm
48 
49 #endif
50