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"
40 #include <sys/types.h>
49 using namespace trace;
52 class ZLibFile : public File {
54 ZLibFile(const std::string &filename = std::string(),
55 File::Mode mode = File::Read);
59 virtual bool supportsOffsets() const;
60 virtual File::Offset currentOffset();
62 virtual bool rawOpen(const std::string &filename, File::Mode mode);
63 virtual bool rawWrite(const void *buffer, size_t length);
64 virtual size_t rawRead(void *buffer, size_t length);
65 virtual int rawGetc();
66 virtual void rawClose();
67 virtual void rawFlush();
68 virtual bool rawSkip(size_t length);
69 virtual int rawPercentRead();
75 ZLibFile::ZLibFile(const std::string &filename,
77 : File(filename, mode),
87 bool ZLibFile::rawOpen(const std::string &filename, File::Mode mode)
89 m_gzFile = gzopen(filename.c_str(),
90 (mode == File::Write) ? "wb" : "rb");
92 if (mode == File::Read && m_gzFile) {
93 //XXX: unfortunately zlib doesn't support
94 // SEEK_END or we could've done:
95 //m_endOffset = gzseek(m_gzFile, 0, SEEK_END);
97 gz_state *state = (gz_state *)m_gzFile;
98 off_t loc = lseek(state->fd, 0, SEEK_CUR);
99 m_endOffset = lseek(state->fd, 0, SEEK_END);
100 lseek(state->fd, loc, SEEK_SET);
103 return m_gzFile != NULL;
106 bool ZLibFile::rawWrite(const void *buffer, size_t length)
108 return gzwrite(m_gzFile, buffer, length) != -1;
111 size_t ZLibFile::rawRead(void *buffer, size_t length)
113 int ret = gzread(m_gzFile, buffer, length);
114 return ret < 0 ? 0 : ret;
117 int ZLibFile::rawGetc()
119 return gzgetc(m_gzFile);
122 void ZLibFile::rawClose()
130 void ZLibFile::rawFlush()
132 gzflush(m_gzFile, Z_SYNC_FLUSH);
135 File::Offset ZLibFile::currentOffset()
137 return File::Offset(gztell(m_gzFile));
140 bool ZLibFile::supportsOffsets() const
145 bool ZLibFile::rawSkip(size_t)
150 int ZLibFile::rawPercentRead()
152 gz_state *state = (gz_state *)m_gzFile;
153 return 100 * (lseek(state->fd, 0, SEEK_CUR) / m_endOffset);
157 File * File::createZLib(void) {