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#include <stdio.h>
/* Test vector: 1 CAEF24F1 -> A350796F */
int main(int argc, char ** argv)
{
unsigned int trknum = 1;
unsigned int discid;
char dummy;
if(argc != 3)
{
fprintf(stderr, "Please invoke as 'mp3key <tracknum> <discid>'\n"
"where tracknum is a decimal track number and discid is the last 8\n"
"digits (4 bytes) of the hex disc id\n");
return 1;
}
if(sscanf(argv[1],"%d%c",&trknum,&dummy) != 1)
{
fprintf(stderr, "Track number is not a decimal integer\n");
return 1;
}
if(sscanf(argv[2],"%x%c",&discid,&dummy) != 1)
{
fprintf(stderr, "Disk ID is not an 8 digit hex string\n");
return 1;
}
unsigned int foo = ((trknum*0x6953B2ED)+0x6BAAB1) ^ discid;
printf("%08X\n", foo & 0xFFFFFFFF);
return 0;
}
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