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/**************************************************************************
*
* Copyright 2011 Zack Rusin
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
**************************************************************************/
#include "trace_file.hpp"
#include <assert.h>
#include <string.h>
#include <zlib.h>
#include <gzguts.h>
#include "os.hpp"
#include <iostream>
using namespace trace;
class ZLibFile : public File {
public:
ZLibFile(const std::string &filename = std::string(),
File::Mode mode = File::Read);
virtual ~ZLibFile();
virtual bool supportsOffsets() const;
virtual File::Offset currentOffset();
protected:
virtual bool rawOpen(const std::string &filename, File::Mode mode);
virtual bool rawWrite(const void *buffer, size_t length);
virtual size_t rawRead(void *buffer, size_t length);
virtual int rawGetc();
virtual void rawClose();
virtual void rawFlush();
virtual bool rawSkip(size_t length);
virtual int rawPercentRead();
private:
void *m_gzFile;
double m_endOffset;
};
ZLibFile::ZLibFile(const std::string &filename,
File::Mode mode)
: File(filename, mode),
m_gzFile(NULL)
{
}
ZLibFile::~ZLibFile()
{
close();
}
bool ZLibFile::rawOpen(const std::string &filename, File::Mode mode)
{
m_gzFile = gzopen(filename.c_str(),
(mode == File::Write) ? "wb" : "rb");
if (mode == File::Read && m_gzFile) {
//XXX: unfortunately zlib doesn't support
// SEEK_END or we could've done:
//m_endOffset = gzseek(m_gzFile, 0, SEEK_END);
//gzrewind(m_gzFile);
gz_state *state = (gz_state *)m_gzFile;
off_t loc = lseek(state->fd, 0, SEEK_CUR);
m_endOffset = lseek(state->fd, 0, SEEK_END);
lseek(state->fd, loc, SEEK_SET);
}
return m_gzFile != NULL;
}
bool ZLibFile::rawWrite(const void *buffer, size_t length)
{
return gzwrite(m_gzFile, buffer, length) != -1;
}
size_t ZLibFile::rawRead(void *buffer, size_t length)
{
int ret = gzread(m_gzFile, buffer, length);
return ret < 0 ? 0 : ret;
}
int ZLibFile::rawGetc()
{
return gzgetc(m_gzFile);
}
void ZLibFile::rawClose()
{
if (m_gzFile) {
gzclose(m_gzFile);
m_gzFile = NULL;
}
}
void ZLibFile::rawFlush()
{
gzflush(m_gzFile, Z_SYNC_FLUSH);
}
File::Offset ZLibFile::currentOffset()
{
return File::Offset(gztell(m_gzFile));
}
bool ZLibFile::supportsOffsets() const
{
return false;
}
bool ZLibFile::rawSkip(size_t)
{
return false;
}
int ZLibFile::rawPercentRead()
{
gz_state *state = (gz_state *)m_gzFile;
return 100 * (lseek(state->fd, 0, SEEK_CUR) / m_endOffset);
}
File * File::createZLib(void) {
return new ZLibFile;
}
bool File::isZLibCompressed(const std::string &filename)
{
std::fstream stream(filename.c_str(),
std::fstream::binary | std::fstream::in);
if (!stream.is_open())
return false;
unsigned char byte1, byte2;
stream >> byte1;
stream >> byte2;
stream.close();
return (byte1 == 0x1f && byte2 == 0x8b);
}
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