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Rockbox mail archiveSubject: RE: descrambleRE: descramble
From: Björn Stenberg <bjorn_at_haxx.se>
Date: Tue, 11 Dec 2001 01:14:59 +0100 (CET) Andy Choi wrote: > (sum of all unscrambed bytes, Ahhh, I should have guessed it was something that simple... :-) > plus a version-specific offset) Actually, the version offset is not needed. It was just a little mistake: > // compute checksum > int cksum = 0; ^^^ You're using a 32-bit integer for the 16-bit checksum, that's why it doesn't match. Here's my simple checksum program in C, using a 16-bit integer: #include <stdio.h> int main (int argc, char** argv) { unsigned short crc=0; int a; while ((a = getc(stdin)) >= 0) crc += a; printf("crc: %04x\n",crc); return 0; } I'll make a full "scramble.c" and put it on the web page. Good job! /Björn Received on 2001-12-11 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |