PeerStreamer

        }

    }

    ctx[256]=1;

    if(ctx_size >= sizeof(AVCRC)*1024)

        for (i = 0; i < 256; i++)

            for(j=0; j<3; j++)

                ctx[256*(j+1) + i]= (ctx[256*j + i]>>8) ^ ctx[ ctx[256*j + i]&0xFF ];

    return 0;

}

uint32_t av_crc(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length){

    const uint8_t *end= buffer+length;

    if(!ctx[256])

        while(buffer<end-3){

            crc ^= le2me_32(*(uint32_t*)buffer); buffer+=4;

                  ^ctx[1*256 + ((crc>>16)&0xFF)]

                  ^ctx[0*256 + ((crc>>24)     )];

        }

    while(buffer<end)

        crc = ctx[((uint8_t)crc) ^ *buffer++] ^ (crc >> 8);