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#include <memory>
19#include "llvm/ADT/SmallVector.h"
20
21namespace llvm {
22
23class StringRef;
24
25namespace zlib {
26
27enum CompressionLevel {
28  NoCompression,
29  DefaultCompression,
30  BestSpeedCompression,
31  BestSizeCompression
32};
33
34enum 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
43bool isAvailable();
44
45Status compress(StringRef InputBuffer, SmallVectorImpl<char> &CompressedBuffer,
46                CompressionLevel Level = DefaultCompression);
47
48Status uncompress(StringRef InputBuffer,
49                  SmallVectorImpl<char> &UncompressedBuffer,
50                  size_t UncompressedSize);
51
52uint32_t crc32(StringRef Buffer);
53
54}  // End of namespace zlib
55
56} // End of namespace llvm
57
58#endif
59
60