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"
41 using namespace Trace;
44 File::File(const std::string &filename,
49 if (!filename.empty()) {
50 open(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 ZLibFile::ZLibFile(const std::string &filename,
98 : File(filename, mode),
103 ZLibFile::~ZLibFile()
107 bool ZLibFile::rawOpen(const std::string &filename, File::Mode mode)
109 m_gzFile = gzopen(filename.c_str(),
110 (mode == File::Write) ? "wb" : "rb");
112 if (mode == File::Read && m_gzFile) {
113 //XXX: unfortunately zlib doesn't support
114 // SEEK_END or we could've done:
115 //m_endOffset = gzseek(m_gzFile, 0, SEEK_END);
116 //gzrewind(m_gzFile);
117 gz_state *state = (gz_state *)m_gzFile;
118 off_t loc = lseek(state->fd, 0, SEEK_CUR);
119 m_endOffset = lseek(state->fd, 0, SEEK_END);
120 lseek(state->fd, loc, SEEK_SET);
123 return m_gzFile != NULL;
126 bool ZLibFile::rawWrite(const void *buffer, size_t length)
128 return gzwrite(m_gzFile, buffer, length) != -1;
131 bool ZLibFile::rawRead(void *buffer, size_t length)
133 return gzread(m_gzFile, buffer, length) != -1;
136 int ZLibFile::rawGetc()
138 return gzgetc(m_gzFile);
141 void ZLibFile::rawClose()
149 void ZLibFile::rawFlush()
151 gzflush(m_gzFile, Z_SYNC_FLUSH);
154 File::Offset ZLibFile::currentOffset()
156 return File::Offset(gztell(m_gzFile));
159 bool ZLibFile::supportsOffsets() const
164 bool ZLibFile::rawSkip(size_t)
169 int ZLibFile::rawPercentRead()
171 gz_state *state = (gz_state *)m_gzFile;
172 return 100 * (lseek(state->fd, 0, SEEK_CUR) / m_endOffset);