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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 <fcntl.h>
#ifdef _WIN32
#include <io.h>
#else
#include <sys/types.h>
#include <unistd.h>
#endif
#include "os.hpp"
#include <iostream>
using namespace trace;
class ZLibFile : public File {
public:
ZLibFile(void);
virtual ~ZLibFile();
protected:
virtual bool rawOpen(const char *filename) override;
virtual size_t rawRead(void *buffer, size_t length) override;
virtual int rawGetc(void) override;
virtual void rawClose(void) override;
virtual bool rawSkip(size_t length) override;
size_t containerSizeInBytes(void) const override;
size_t containerBytesRead(void) const override;
size_t dataBytesRead(void) const override;
const char *containerType(void) const override;
private:
int fd = 0;
gzFile m_gzFile = nullptr;
off_t m_endOffset = 0;
size_t m_dataBytesRead = 0;
};
ZLibFile::ZLibFile(void)
{
}
ZLibFile::~ZLibFile()
{
close();
}
bool ZLibFile::rawOpen(const char *filename)
{
int flags = O_RDONLY;
#ifdef O_BINARY
flags |= O_BINARY;
#endif
#ifdef O_LARGEFILE
flags |= O_LARGEFILE;
#endif
#ifdef _WIN32
fd = _open(filename, flags, 0666);
#else
fd = ::open(filename, flags, 0666);
#endif
if (fd < 0) {
return false;
}
m_gzFile = gzdopen(fd, "rb");
if (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);
off_t loc = lseek(fd, 0, SEEK_CUR);
m_endOffset = lseek(fd, 0, SEEK_END);
lseek(fd, loc, SEEK_SET);
m_dataBytesRead = 0;
}
return m_gzFile != NULL;
}
size_t ZLibFile::rawRead(void *buffer, size_t length)
{
int ret = gzread(m_gzFile, buffer, unsigned(length));
if (ret > 0) {
m_dataBytesRead += static_cast<size_t>(ret);
}
return ret < 0 ? 0 : ret;
}
int ZLibFile::rawGetc()
{
return gzgetc(m_gzFile);
}
void ZLibFile::rawClose()
{
if (m_gzFile) {
gzclose(m_gzFile);
m_gzFile = NULL;
}
}
bool ZLibFile::rawSkip(size_t)
{
return false;
}
size_t ZLibFile::containerSizeInBytes(void) const {
return static_cast<size_t>(m_endOffset);
}
size_t ZLibFile::containerBytesRead(void) const {
return static_cast<size_t>(lseek(fd, 0, SEEK_CUR));
}
size_t ZLibFile::dataBytesRead(void) const {
return m_dataBytesRead;
}
const char *ZLibFile::containerType(void) const {
return "ZLib";
}
File * File::createZLib(void) {
return new ZLibFile;
}
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