filereader.cc

Linux下比较早的基于命令行的DVD播放器

//
// Copyright (c) 2005 by Istv醤 V醨adi
//
// This file is part of dxr3Player, a DVD player written specifically 
// for the DXR3 (aka Hollywood+) decoder card.

// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

//------------------------------------------------------------------------------

#include "FileReader.h"

#include <cassert>

#include <byteswap.h>

//------------------------------------------------------------------------------

FileReader::FileReader(FILE* file) :
    file(file)
{
}

//------------------------------------------------------------------------------

bool FileReader::read(uint8_t& x)
{
    size_t s = fread(&x, sizeof(x), 1, file);
    return s==1;
}

//------------------------------------------------------------------------------

uint8_t FileReader::read8()
{
    uint8_t x;

    bool isok = read(x);
    assert(isok);

    return x;
}

//------------------------------------------------------------------------------

bool FileReader::read(int8_t& x)
{
    size_t s = fread(&x, sizeof(x), 1, file);
    return s==1;
}

//------------------------------------------------------------------------------

int8_t FileReader::readS8()
{
    int8_t x;

    bool isok = read(x);
    assert(isok);

    return x;
}

//------------------------------------------------------------------------------

bool FileReader::read(uint16_t& x)
{
    size_t s = fread(&x, sizeof(x), 1, file);
#ifndef WORDS_BIGENDIAN
    x = bswap_16(x);
#endif    
    return s==1;
}

//------------------------------------------------------------------------------

uint16_t FileReader::read16()
{
    uint16_t x;

    bool isok = read(x);
    assert(isok);

    return x;
}

//------------------------------------------------------------------------------

bool FileReader::read(uint32_t& x)
{
    size_t s = fread(&x, sizeof(x), 1, file);
#ifndef WORDS_BIGENDIAN
    x = bswap_32(x);
#endif    
    return s==1;
}

//------------------------------------------------------------------------------

uint32_t FileReader::read32()
{
    uint32_t x;

    bool isok = read(x);
    assert(isok);

    return x;
}

//------------------------------------------------------------------------------

bool FileReader::read(uint64_t& x)
{
    size_t s = fread(&x, sizeof(x), 1, file);
#ifndef WORDS_BIGENDIAN
    uint32_t* x1 = (uint32_t*)&x;
    x1[0] = bswap_32(x1[0]);
    x1[1] = bswap_32(x1[1]);
    x = x1[1];
    x <<= 32;
    x |= x1[0];
#endif    
    return s==1;
}

//------------------------------------------------------------------------------

uint64_t FileReader::read64()
{
    uint64_t x;

    bool isok = read(x);
    assert(isok);

    return x;
}

//------------------------------------------------------------------------------

bool FileReader::read(void* buffer, size_t length)
{
    size_t s = fread(buffer, length, 1, file);
    return s==1;
}

//------------------------------------------------------------------------------