124 lines
2.3 KiB
C++
124 lines
2.3 KiB
C++
// Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the LICENSE file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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#include "mkvreader.hpp"
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#include <cassert>
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MkvReader::MkvReader() :
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m_file(NULL)
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{
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}
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MkvReader::~MkvReader()
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{
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Close();
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}
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int MkvReader::Open(const char* fileName)
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{
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if (fileName == NULL)
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return -1;
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if (m_file)
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return -1;
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#ifdef WIN32
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const errno_t e = fopen_s(&m_file, fileName, "rb");
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if (e)
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return -1; //error
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#else
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m_file = fopen(fileName, "rb");
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if (m_file == NULL)
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return -1;
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#endif
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#ifdef WIN32
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int status = _fseeki64(m_file, 0L, SEEK_END);
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if (status)
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return -1; //error
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m_length = _ftelli64(m_file);
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#else
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fseek(m_file, 0L, SEEK_END);
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m_length = ftell(m_file);
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#endif
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assert(m_length >= 0);
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#ifdef WIN32
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status = _fseeki64(m_file, 0L, SEEK_SET);
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if (status)
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return -1; //error
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#else
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fseek(m_file, 0L, SEEK_SET);
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#endif
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return 0;
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}
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void MkvReader::Close()
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{
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if (m_file != NULL)
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{
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fclose(m_file);
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m_file = NULL;
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}
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}
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int MkvReader::Length(long long* total, long long* available)
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{
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if (m_file == NULL)
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return -1;
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if (total)
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*total = m_length;
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if (available)
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*available = m_length;
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return 0;
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}
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int MkvReader::Read(long long offset, long len, unsigned char* buffer)
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{
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if (m_file == NULL)
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return -1;
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if (offset < 0)
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return -1;
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if (len < 0)
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return -1;
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if (len == 0)
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return 0;
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if (offset >= m_length)
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return -1;
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#ifdef WIN32
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const int status = _fseeki64(m_file, offset, SEEK_SET);
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if (status)
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return -1; //error
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#else
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fseek(m_file, offset, SEEK_SET);
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#endif
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const size_t size = fread(buffer, 1, len, m_file);
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if (size < size_t(len))
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return -1; //error
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return 0; //success
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}
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