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,
48 if (!filename.empty()) {
49 open(filename, m_mode);
59 void File::setCurrentOffset(const File::Offset &offset)
64 bool File::isZLibCompressed(const std::string &filename)
66 std::fstream stream(filename.c_str(),
67 std::fstream::binary | std::fstream::in);
68 if (!stream.is_open())
71 unsigned char byte1, byte2;
76 return (byte1 == 0x1f && byte2 == 0x8b);
80 bool File::isSnappyCompressed(const std::string &filename)
82 std::fstream stream(filename.c_str(),
83 std::fstream::binary | std::fstream::in);
84 if (!stream.is_open())
87 unsigned char byte1, byte2;
92 return (byte1 == SNAPPY_BYTE1 && byte2 == SNAPPY_BYTE2);
95 typedef struct gz_stream {
97 int z_err; /* error code for last stream operation */
98 int z_eof; /* set if end of input file */
99 FILE *file; /* .gz file */
102 ZLibFile::ZLibFile(const std::string &filename,
104 : File(filename, mode),
109 ZLibFile::~ZLibFile()
113 bool ZLibFile::rawOpen(const std::string &filename, File::Mode mode)
115 m_gzFile = gzopen(filename.c_str(),
116 (mode == File::Write) ? "wb" : "rb");
118 if (mode == File::Read && m_gzFile) {
119 //XXX: unfortunately zlib doesn't support
120 // SEEK_END or we could've done:
121 //m_endOffset = gzseek(m_gzFile, 0, SEEK_END);
122 //gzrewind(m_gzFile);
123 gz_dummy_stream *stream = (gz_dummy_stream *)m_gzFile;
124 long loc = ftell(stream->file);
125 fseek(stream->file,0,SEEK_END);
126 m_endOffset = ftell(stream->file);
127 fseek(stream->file, loc, SEEK_SET);
130 return m_gzFile != NULL;
133 bool ZLibFile::rawWrite(const void *buffer, size_t length)
135 return gzwrite(m_gzFile, buffer, length) != -1;
138 bool ZLibFile::rawRead(void *buffer, size_t length)
140 return gzread(m_gzFile, buffer, length) != -1;
143 int ZLibFile::rawGetc()
145 return gzgetc(m_gzFile);
148 void ZLibFile::rawClose()
156 void ZLibFile::rawFlush()
158 gzflush(m_gzFile, Z_SYNC_FLUSH);
161 File::Offset ZLibFile::currentOffset()
163 return File::Offset(gztell(m_gzFile));
166 bool ZLibFile::supportsOffsets() const
171 bool ZLibFile::rawSkip(size_t)
176 int ZLibFile::rawPercentRead()
178 gz_dummy_stream *stream = (gz_dummy_stream *)m_gzFile;
179 return 100 * (ftell(stream->file) / m_endOffset);