diff options
Diffstat (limited to 'src/hash.c')
-rw-r--r-- | src/hash.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/src/hash.c b/src/hash.c new file mode 100644 index 0000000..53a3542 --- /dev/null +++ b/src/hash.c @@ -0,0 +1,62 @@ +/* + * Copyright (C) 2007 + * pancake <pancake@youterm.com> + * + * 0xFFFF is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * 0xFFFF is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with 0xFFFF; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + */ + +#include <stdio.h> +#include "hash.h" + +usho do_hash(usho *b, int len) +{ + usho result = 0; + for(len>>=1;len--;b=b+1) + result^=b[0]; + return result; +} + +usho do_hash_file(char *filename) +{ + unsigned char buf[BSIZE]; + FILE *fd = fopen(filename, "r"); + usho hash = 0; + int ret; + + if (fd == NULL) { + fprintf(stderr, "ERROR: File '%s' not found.\n", filename); + return -1; + } + + do { ret = fread(&buf, 1, BSIZE, fd); + if (ret == -1) + return 0; + hash ^= do_hash((usho *)&buf, ret); + } while(ret); + + fclose(fd); + + return hash; +} + +#if 0 +main() +{ + usho us = do_hash_file("zImage"); + unsigned char *h= (unsigned char *)&us; + printf("%x %x\n",h[0],h[1]); +} +#endif |