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 size_t 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),
79 bool ZLibFile::rawOpen(const std::string &filename, File::Mode mode)
81 m_gzFile = gzopen(filename.c_str(),
82 (mode == File::Write) ? "wb" : "rb");
84 if (mode == File::Read && m_gzFile) {
85 //XXX: unfortunately zlib doesn't support
86 // SEEK_END or we could've done:
87 //m_endOffset = gzseek(m_gzFile, 0, SEEK_END);
89 gz_state *state = (gz_state *)m_gzFile;
90 off_t loc = lseek(state->fd, 0, SEEK_CUR);
91 m_endOffset = lseek(state->fd, 0, SEEK_END);
92 lseek(state->fd, loc, SEEK_SET);
95 return m_gzFile != NULL;
98 bool ZLibFile::rawWrite(const void *buffer, size_t length)
100 return gzwrite(m_gzFile, buffer, length) != -1;
103 size_t ZLibFile::rawRead(void *buffer, size_t length)
105 int ret = gzread(m_gzFile, buffer, length);
106 return ret < 0 ? 0 : ret;
109 int ZLibFile::rawGetc()
111 return gzgetc(m_gzFile);
114 void ZLibFile::rawClose()
122 void ZLibFile::rawFlush()
124 gzflush(m_gzFile, Z_SYNC_FLUSH);
127 File::Offset ZLibFile::currentOffset()
129 return File::Offset(gztell(m_gzFile));
132 bool ZLibFile::supportsOffsets() const
137 bool ZLibFile::rawSkip(size_t)
142 int ZLibFile::rawPercentRead()
144 gz_state *state = (gz_state *)m_gzFile;
145 return 100 * (lseek(state->fd, 0, SEEK_CUR) / m_endOffset);
149 File * File::createZLib(void) {
153 bool File::isZLibCompressed(const std::string &filename)
155 std::fstream stream(filename.c_str(),
156 std::fstream::binary | std::fstream::in);
157 if (!stream.is_open())
160 unsigned char byte1, byte2;
165 return (byte1 == 0x1f && byte2 == 0x8b);