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"
41 using namespace trace;
44 class ZLibFile : public File {
46 ZLibFile(const std::string &filename = std::string(),
47 File::Mode mode = File::Read);
51 virtual bool supportsOffsets() const;
52 virtual File::Offset currentOffset();
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();
60 virtual bool rawSkip(size_t length);
61 virtual int rawPercentRead();
67 ZLibFile::ZLibFile(const std::string &filename,
69 : File(filename, mode),
78 bool ZLibFile::rawOpen(const std::string &filename, File::Mode mode)
80 m_gzFile = gzopen(filename.c_str(),
81 (mode == File::Write) ? "wb" : "rb");
83 if (mode == File::Read && m_gzFile) {
84 //XXX: unfortunately zlib doesn't support
85 // SEEK_END or we could've done:
86 //m_endOffset = gzseek(m_gzFile, 0, SEEK_END);
88 gz_state *state = (gz_state *)m_gzFile;
89 off_t loc = lseek(state->fd, 0, SEEK_CUR);
90 m_endOffset = lseek(state->fd, 0, SEEK_END);
91 lseek(state->fd, loc, SEEK_SET);
94 return m_gzFile != NULL;
97 bool ZLibFile::rawWrite(const void *buffer, size_t length)
99 return gzwrite(m_gzFile, buffer, length) != -1;
102 bool ZLibFile::rawRead(void *buffer, size_t length)
104 return gzread(m_gzFile, buffer, length) != -1;
107 int ZLibFile::rawGetc()
109 return gzgetc(m_gzFile);
112 void ZLibFile::rawClose()
120 void ZLibFile::rawFlush()
122 gzflush(m_gzFile, Z_SYNC_FLUSH);
125 File::Offset ZLibFile::currentOffset()
127 return File::Offset(gztell(m_gzFile));
130 bool ZLibFile::supportsOffsets() const
135 bool ZLibFile::rawSkip(size_t)
140 int ZLibFile::rawPercentRead()
142 gz_state *state = (gz_state *)m_gzFile;
143 return 100 * (lseek(state->fd, 0, SEEK_CUR) / m_endOffset);
147 File * File::createZLib(void) {
151 bool File::isZLibCompressed(const std::string &filename)
153 std::fstream stream(filename.c_str(),
154 std::fstream::binary | std::fstream::in);
155 if (!stream.is_open())
158 unsigned char byte1, byte2;
163 return (byte1 == 0x1f && byte2 == 0x8b);