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