imagecommon.cpp

来自「在MTK平台上开放的一个皮肤工具,可以支持jpg、bmp、png图片」· C++ 代码 · 共 485 行 · 第 1/2 页

    U16 MSB, LSB;

    /*----------------------------------------------------------------*/
    /* Code Body                                                      */
    /*----------------------------------------------------------------*/
    LSB = bytestream_fgetbyte(file);
    MSB = bytestream_fgetbyte(file);
    return ((MSB << 8) | LSB);
}


/*****************************************************************************
 * FUNCTION
 *  bytestream_fgetdword
 * DESCRIPTION
 *  
 * PARAMETERS
 *  file        [?]     
 * RETURNS
 *  
 *****************************************************************************/
U32 bytestream_fgetdword(bytestream *file)
{
    /*----------------------------------------------------------------*/
    /* Local Variables                                                */
    /*----------------------------------------------------------------*/
    U32 MSB, LSB;

    /*----------------------------------------------------------------*/
    /* Code Body                                                      */
    /*----------------------------------------------------------------*/
    LSB = bytestream_fgetword(file);
    MSB = bytestream_fgetword(file);
    return ((MSB << 16) | LSB);
}


/*****************************************************************************
 * FUNCTION
 *  bytestream_fputword
 * DESCRIPTION
 *  
 * PARAMETERS
 *  file        [?]         
 *  w           [IN]        
 * RETURNS
 *  
 *****************************************************************************/
U8 bytestream_fputword(bytestream *file, U16 w)
{
    /*----------------------------------------------------------------*/
    /* Local Variables                                                */
    /*----------------------------------------------------------------*/
    U8 MSB, LSB, rvalue;

    /*----------------------------------------------------------------*/
    /* Code Body                                                      */
    /*----------------------------------------------------------------*/
    LSB = w & 0xff;
    MSB = w >> 8;
    rvalue = bytestream_fputbyte(file, LSB);
    rvalue = bytestream_fputbyte(file, MSB);
    return (rvalue);
}


/*****************************************************************************
 * FUNCTION
 *  bytestream_fputword_bigendian
 * DESCRIPTION
 *  
 * PARAMETERS
 *  file        [?]         
 *  w           [IN]        
 * RETURNS
 *  
 *****************************************************************************/
U8 bytestream_fputword_bigendian(bytestream *file, U16 w)
{
    /*----------------------------------------------------------------*/
    /* Local Variables                                                */
    /*----------------------------------------------------------------*/
    U8 MSB, LSB, rvalue;

    /*----------------------------------------------------------------*/
    /* Code Body                                                      */
    /*----------------------------------------------------------------*/
    LSB = w & 0xff;
    MSB = w >> 8;
    rvalue = bytestream_fputbyte(file, MSB);
    rvalue = bytestream_fputbyte(file, LSB);
    return (rvalue);
}


/*****************************************************************************
 * FUNCTION
 *  bytestream_fputdword
 * DESCRIPTION
 *  
 * PARAMETERS
 *  file        [?]         
 *  d           [IN]        
 * RETURNS
 *  
 *****************************************************************************/
U8 bytestream_fputdword(bytestream *file, U32 d)
{
    /*----------------------------------------------------------------*/
    /* Local Variables                                                */
    /*----------------------------------------------------------------*/
    U16 MSB, LSB;
    U8 rvalue;

    /*----------------------------------------------------------------*/
    /* Code Body                                                      */
    /*----------------------------------------------------------------*/
    LSB = (U16) d & 0xffff;
    MSB = (U16) d >> 16;
    rvalue = bytestream_fputword(file, LSB);
    rvalue = bytestream_fputword(file, MSB);
    return (rvalue);
}


/*****************************************************************************
 * FUNCTION
 *  bytestream_fputdword_bigendian
 * DESCRIPTION
 *  
 * PARAMETERS
 *  file        [?]         
 *  d           [IN]        
 * RETURNS
 *  
 *****************************************************************************/
U8 bytestream_fputdword_bigendian(bytestream *file, U32 d)
{
    /*----------------------------------------------------------------*/
    /* Local Variables                                                */
    /*----------------------------------------------------------------*/
    U16 MSB, LSB;
    U8 rvalue;

    /*----------------------------------------------------------------*/
    /* Code Body                                                      */
    /*----------------------------------------------------------------*/
    LSB = (U16) d & 0xffff;
    MSB = (U16) d >> 16;
    rvalue = bytestream_fputword_bigendian(file, MSB);
    rvalue = bytestream_fputword_bigendian(file, LSB);
    return (rvalue);
}


/*****************************************************************************
 * FUNCTION
 *  bytestream_fgetword_bigendian
 * DESCRIPTION
 *  
 * PARAMETERS
 *  file        [?]     
 * RETURNS
 *  
 *****************************************************************************/
U16 bytestream_fgetword_bigendian(bytestream *file)
{
    /*----------------------------------------------------------------*/
    /* Local Variables                                                */
    /*----------------------------------------------------------------*/
    U16 MSB, LSB;

    /*----------------------------------------------------------------*/
    /* Code Body                                                      */
    /*----------------------------------------------------------------*/
    MSB = bytestream_fgetbyte(file);
    LSB = bytestream_fgetbyte(file);
    return ((MSB << 8) | LSB);
}


/*****************************************************************************
 * FUNCTION
 *  bytestream_fgetdword_bigendian
 * DESCRIPTION
 *  
 * PARAMETERS
 *  file        [?]     
 * RETURNS
 *  
 *****************************************************************************/
U32 bytestream_fgetdword_bigendian(bytestream *file)
{
    /*----------------------------------------------------------------*/
    /* Local Variables                                                */
    /*----------------------------------------------------------------*/
    U32 MSB, LSB;

    /*----------------------------------------------------------------*/
    /* Code Body                                                      */
    /*----------------------------------------------------------------*/
    MSB = bytestream_fgetword_bigendian(file);
    LSB = bytestream_fgetword_bigendian(file);
    return ((MSB << 16) | LSB);
}

/* Used to read variable length data: Useful only for MIDI files  */


/*****************************************************************************
 * FUNCTION
 *  bytestream_fgetvdata
 * DESCRIPTION
 *  
 * PARAMETERS
 *  file        [?]     
 * RETURNS
 *  
 *****************************************************************************/
U32 bytestream_fgetvdata(bytestream *file)
{
    /*----------------------------------------------------------------*/
    /* Local Variables                                                */
    /*----------------------------------------------------------------*/
    U32 rvalue;
    U8 b;

    /*----------------------------------------------------------------*/
    /* Code Body                                                      */
    /*----------------------------------------------------------------*/
    if ((rvalue = bytestream_fgetbyte(file)) & 0x80)
    {
        rvalue &= 0x7f;
        do
        {
            rvalue = (rvalue << 7) + ((b = bytestream_fgetbyte(file)) & 0x7f);
        } while (b & 0x80);
    }
    return (rvalue);
}