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 
60