source: svn/newcon3bcm2_21bu/dst/dhl/src/DHL_UTL.c @ 45

/**
        @file
                DHL_UTL.c

        @brief
                PHOENIX HAL library


        Copyright 2006~2010 Digital STREAM Technology, Inc.
        All Rights Reserved
*/


#include "DHL_OSAL.h"
#include "DHL_DBG.h"

#include "DHL_UTL.h"


/*
        ¸ðµç Çì´õ ÆÄÀÏÀ» Æ÷ÇÔÇÏÁö´Â ¾ÊÀ¸¸ç, compile timeÀ» ÁÙÀ̱â À§ÇØ
        °¢ ¸ðµâÀº ÇÊ¿äÇÑ ¸¸Å­ÀÇ Çì´õ¸¦ ¼±¾ðÇϵµ·Ï ÇÔ.
*/



/*
        DHL µð¹ö±× ¸ðµâ À̸§ Á¤ÀÇ ·ê Âü°í:

        DHL ¸ðµâµéÀº ¸ðµÎ * ·Î ½ÃÀÛ.
        API´Â ´ë¹®ÀÚ, Platform ¹× ±âŸ´Â ¼Ò¹®ÀÚ »ç¿ë.

        µðÆúÆ® ·¹º§Àº 0À¸·Î ¼³Á¤ÇÑ´Ù. (0: ¿¡·¯ ¸Þ½ÃÁö¸¸ Ãâ·Â)
        
        
*/

//DHL_MODULE("*UTL", 0);



#if COMMENT
____Config____(){}
#endif

/*
        ÀÌ ¸ðµâ ³»ºÎ¿¡¼­ »ç¿ëµÇ´Â °¢Á¾ configuration Á¤ÀÇ.
*/


/* #define SUPPORT_FAST_SWITCHING_OPTIMIZATION 1 */
/* #define FUNC_MONITOR_TIMER_ID TIMER_ID_FUNC_MONITOR */



#if COMMENT
____Types____(){}
#endif

/*
        ÀÌ ¸ðµâ ³»ºÎ¿¡¼­ »ç¿ëµÇ´Â structure ¹× enumerations.
*/



#if COMMENT
____Variables____(){}
#endif

/*
        global·Î Àû¿ëµÇ´Â variable Á¤ÀÇ.
        °¢ function º°·Î Ư¼öÇÑ ¿ëµµÀÇ variableÀº °¢ functionX block ¿¡¼­ Á¤ÀÇ °¡´É.
*/



#if COMMENT
____API____(){}
#endif

static UINT32 dhl_crcTable[256];

static BOOLEAN dhl_CRCInited;

#define  DEMUX_CRC_ADDER_MASK    0x04C11DB7  /* As defined in MPEG-2 CRC */


void dhl_InitCRC(void)
{
        UINT32          crc;
        INT32           i, j;

        if (dhl_CRCInited) return;
        
        // Initialize CRC table
        for (i=0; i<256; i++) {
                crc = 0;
                for (j=7; j>=0; j--) {
                        if (((i >> j) ^ (crc >> 31)) & 1) {
                                crc=(crc<<1)^DEMUX_CRC_ADDER_MASK;
                        }
                        else {
                                crc<<=1;
                        }
                }
                dhl_crcTable[i] = crc;
        }
        dhl_CRCInited = TRUE;
}


UINT32 DHL_UTL_CalcCRC32(UINT32 crc_start, const UINT8 *data, UINT32 len)
{
    UINT32  crc = crc_start;
    UINT32  i;

    if (!dhl_CRCInited) {
        dhl_InitCRC();
    }

    for (i = 0; i < len; ++i) {
        crc = (crc << 8) ^ dhl_crcTable[(crc >> 24) ^ (*data++)];
    }
    
    return(crc);
}




#if COMMENT
____Debug____(){}
#endif




#if COMMENT
____Symbol____(){}
#endif


#if DHL_REGISTER_DEUBG_SYMBOLS

static DHL_SymbolTable _XxxxSymbols[] =
{
        /* however, if you want typing short-cut, it is good usage.
        */
/*      DHL_FNC_SYM_ENTRY2("epg_start", App_EpgUpdateStart),
        DHL_FNC_SYM_ENTRY2("epg_stop", App_EpgUpdateCancel),
        DHL_FNC_SYM_ENTRY2("epg_list", Dmc_EpgPrintAllTables),
        DHL_FNC_SYM_ENTRY2("epg_delete", App_EpgDeleteAll),

        DHL_VAR_SYM_ENTRY(g_XX_TestMode),*/
        0,

};

#endif  /* DHL_REGISTER_DEUBG_SYMBOLS */



#if COMMENT
____Init____(){}
#endif



/* end of file */