1 /**************************************************************************
3 * Copyright 2011 Zack Rusin
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 **************************************************************************/
27 #ifndef TRACE_SNAPPYFILE_HPP
28 #define TRACE_SNAPPYFILE_HPP
30 #include "trace_file.hpp"
41 #define SNAPPY_CHUNK_SIZE (1 * 1024 * 1024)
43 #define SNAPPY_BYTE1 'a'
44 #define SNAPPY_BYTE2 't'
47 class SnappyFile : public File {
49 SnappyFile(const std::string &filename = std::string(),
50 File::Mode mode = File::Read);
51 virtual ~SnappyFile();
54 virtual bool rawOpen(const std::string &filename, File::Mode mode);
55 virtual bool rawWrite(const void *buffer, size_t length);
56 virtual bool rawRead(void *buffer, size_t length);
57 virtual int rawGetc();
58 virtual void rawClose();
59 virtual void rawFlush();
62 inline size_t freeCacheSize() const
65 return m_cacheSize - (m_cachePtr - m_cache);
69 inline bool endOfData() const
71 return m_stream.eof() && freeCacheSize() == 0;
74 void createCache(size_t size);
75 void writeCompressedLength(size_t length);
76 size_t readCompressedLength();
78 std::fstream m_stream;
83 char *m_compressedCache;
88 #endif // TRACE_SNAPPYFILE_HPP