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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 StringRef;
22 
23 namespace zlib {
24 
25 enum CompressionLevel {
26   NoCompression,
27   DefaultCompression,
28   BestSpeedCompression,
29   BestSizeCompression
30 };
31 
32 enum Status {
33   StatusOK,
34   StatusUnsupported,    // zlib is unavailable
35   StatusOutOfMemory,    // there was not enough memory
36   StatusBufferTooShort, // there was not enough room in the output buffer
37   StatusInvalidArg,     // invalid input parameter
38   StatusInvalidData     // data was corrupted or incomplete
39 };
40 
41 bool isAvailable();
42 
43 Status compress(StringRef InputBuffer, SmallVectorImpl<char> &CompressedBuffer,
44                 CompressionLevel Level = DefaultCompression);
45 
46 Status uncompress(StringRef InputBuffer,
47                   SmallVectorImpl<char> &UncompressedBuffer,
48                   size_t UncompressedSize);
49 
50 uint32_t crc32(StringRef Buffer);
51 
52 }  // End of namespace zlib
53 
54 } // End of namespace llvm
55 
56 #endif
57 
58