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// Copyright (c) 2010 The WebM project authors. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// Modified by Rikard Peterson 2011 to fit in the SLUDGE engine.
#include "mkvreader.hpp"
#include "../newfatal.h"
#include "../fileset.h"
#include <cassert>
#include <stdio.h>
MkvReader::MkvReader() :
m_file(0)
{
}
MkvReader::~MkvReader()
{
Close();
}
int MkvReader::Open(int fileNumber)
{
if (! fileNumber)
return -1;
if (m_file)
return -1;
m_file = fileNumber;
setResourceForFatal (fileNumber);
m_length = openFileFromNum (fileNumber);
if (m_length == 0) {
finishAccess();
setResourceForFatal (-1);
return -1;
}
/*
#ifdef WIN32
m_start = _ftelli64(bigDataFile);
#else*/
m_start = ftell(bigDataFile);
/*#endif
*/
finishAccess();
return 0;
}
void MkvReader::Close()
{
if (m_file)
{
finishAccess();
setResourceForFatal (-1);
m_file = 0;
}
}
int MkvReader::Length(long long* total, long long* available)
{
if (! m_file)
return -1;
if (total)
*total = m_length;
if (available)
*available = m_length;
return 0;
}
int MkvReader::Read(long long offset, long len, unsigned char* buffer)
{
if (! m_file)
return -1;
if (offset < 0)
return -1;
if (len < 0)
return -1;
if (len == 0)
return 0;
if (offset >= m_length)
return -1;
if (startAccess())
fprintf(stderr, "Warning: Datafile already in use when playing movie!\n");
/*
#ifdef WIN32
const int status = _fseeki64(bigDataFile, m_start+offset, SEEK_SET);
if (status)
return -1; //error
#else*/
fseek(bigDataFile, m_start+offset, SEEK_SET);
//#endif
const size_t size = fread(buffer, 1, len, bigDataFile);
finishAccess();
if (size < size_t(len))
return -1; //error
return 0; //success
}
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