source: svn/trunk/newcon3bcm2_21bu/BSEAV/lib/scte65/si_util.c

/***************************************************************
**
** Broadcom Corp. Confidential
** Copyright 2003-2008 Broadcom Corp. All Rights Reserved.
**
** THIS SOFTWARE MAY ONLY BE USED SUBJECT TO AN EXECUTED 
** SOFTWARE LICENSE AGREEMENT BETWEEN THE USER AND BROADCOM. 
** YOU HAVE NO RIGHT TO USE OR EXPLOIT THIS MATERIAL EXCEPT 
** SUBJECT TO THE TERMS OF SUCH AN AGREEMENT.
**
** File:                si_util.c
** Description: general utility functions that can be used in SI 
**              processing. 
**
** Created: 03/08/2001 
**
** REVISION:
**
** $Log: $
**
**
****************************************************************/
#include "si.h"
#include "si_os.h"
#include "si_dbg.h"
#include "si_util.h"

unsigned long SI_Construct_Data( unsigned char * rawdat, unsigned long idx, unsigned long num, unsigned long shift, unsigned long mask)
{
        unsigned long data = 0;
        long i;

        if (num > 4)
        {
                SI_DBG_PRINT(E_SI_ERR_MSG, ("Error in SI_Construct_Data, the number of bytes has to be <= 4!!!\n"));
                return 0;
        }

        for (i=0; i<num; i++)
                data |= ( ((unsigned long)rawdat[i+idx])<<((num-1-i)*8) );
        data >>= shift;

        return (data&mask);
}

SI_RET_CODE SI_CRC32_Check ( unsigned char * data, unsigned short length)
{
#ifdef CONFIG_TABLE_WITH_CRC
        unsigned long reg = 0xffffffff; /* Annex B of ISO/IEC 13818-1, init state all 1's */
        unsigned long add_mask = 0x04c11db6; /* generation poly coefficient except for bit0. */
        unsigned short i;
        short bit;
        unsigned char input, z31;

        for (i=0; i<length; i++)
        {
                for (bit=7; bit>=0; bit--)
                {
                        z31 = (reg&0x80000000)?0x1:0x0;
                        reg <<= 1;
                        input = (data[i] & (0x0001<<bit))?0x01:0x00;
//printf("data %x, input %d\n", data[i], input);                        
                        if (z31 ^ input)
                        {
                                reg ^= add_mask;
                                reg |= 1;
                        }
//printf("reg = %x\n", reg);                    
                }
        }

        if (reg)
                return SI_CRC_ERROR;
#endif /* CONFIG_TABLE_WITH_CRC */
        return SI_SUCCESS;
}

void SI_Init_Section_Mask(unsigned long *mask, unsigned char last_section_number)
{
        unsigned char i;
        for (i=0; i<8; i++)
        {
                mask[i] = 0;
        }
}

unsigned long SI_Chk_Section_mask(unsigned long *mask, unsigned char section_number)
{
        unsigned char index, bit;

        index = section_number/32;
        bit = section_number % 32;

        return (mask[index]&(1<<bit));
}

SI_RET_CODE SI_Chk_Section_complete(unsigned long *mask, unsigned char last_section_number)
{
        unsigned char i;

        for (i = 0; i <= last_section_number; ++i)
        {
                if (SI_Chk_Section_mask(mask,i) == 0)
                {
                        return SI_OTHER_ERROR; /* not all sections received */
                }
        }

        return SI_SUCCESS;
}

void SI_Set_Section_mask(unsigned long *mask, unsigned char section_number)
{
        unsigned char index, bit;

        index = section_number/32;
        bit = section_number % 32;

        mask[index] |= (1<<bit);
}