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 #include "trace_file.hpp"
29 #include "trace_snappyfile.hpp"
40 using namespace Trace;
43 File::File(const std::string &filename,
45 : m_filename(filename),
49 if (!m_filename.empty()) {
50 open(m_filename, m_mode);
60 void File::setCurrentOffset(const File::Offset &offset)
65 bool File::isZLibCompressed(const std::string &filename)
67 std::fstream stream(filename.c_str(),
68 std::fstream::binary | std::fstream::in);
69 if (!stream.is_open())
72 unsigned char byte1, byte2;
77 return (byte1 == 0x1f && byte2 == 0x8b);
81 bool File::isSnappyCompressed(const std::string &filename)
83 std::fstream stream(filename.c_str(),
84 std::fstream::binary | std::fstream::in);
85 if (!stream.is_open())
88 unsigned char byte1, byte2;
93 return (byte1 == SNAPPY_BYTE1 && byte2 == SNAPPY_BYTE2);
96 typedef struct gz_stream {
98 int z_err; /* error code for last stream operation */
99 int z_eof; /* set if end of input file */
100 FILE *file; /* .gz file */
103 ZLibFile::ZLibFile(const std::string &filename,
105 : File(filename, mode),
110 ZLibFile::~ZLibFile()
114 bool ZLibFile::rawOpen(const std::string &filename, File::Mode mode)
116 m_gzFile = gzopen(filename.c_str(),
117 (mode == File::Write) ? "wb" : "rb");
119 if (mode == File::Read && m_gzFile) {
120 //XXX: unfortunately zlib doesn't support
121 // SEEK_END or we could've done:
122 //m_endOffset = gzseek(m_gzFile, 0, SEEK_END);
123 //gzrewind(m_gzFile);
124 gz_dummy_stream *stream = (gz_dummy_stream *)m_gzFile;
125 long loc = ftell(stream->file);
126 fseek(stream->file,0,SEEK_END);
127 m_endOffset = ftell(stream->file);
128 fseek(stream->file, loc, SEEK_SET);
131 return m_gzFile != NULL;
134 bool ZLibFile::rawWrite(const void *buffer, size_t length)
136 return gzwrite(m_gzFile, buffer, length) != -1;
139 bool ZLibFile::rawRead(void *buffer, size_t length)
141 return gzread(m_gzFile, buffer, length) != -1;
144 int ZLibFile::rawGetc()
146 return gzgetc(m_gzFile);
149 void ZLibFile::rawClose()
157 void ZLibFile::rawFlush()
159 gzflush(m_gzFile, Z_SYNC_FLUSH);
162 File::Offset ZLibFile::currentOffset()
164 return File::Offset(gztell(m_gzFile));
167 bool ZLibFile::supportsOffsets() const
172 bool ZLibFile::rawSkip(size_t)
177 int ZLibFile::rawPercentRead()
179 gz_dummy_stream *stream = (gz_dummy_stream *)m_gzFile;
180 return 100 * (ftell(stream->file) / m_endOffset);