133 lines
3.4 KiB
C
133 lines
3.4 KiB
C
/* -*- tab-width:4;c-file-style:"cc-mode"; -*- */
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/*
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* oshash.c -- generate oshash for provided files
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* Copyright (C) 2011-2012 Jan Gerber <j@mailb.org>
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*
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* This program 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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* This program 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 This program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if !defined(_GNU_SOURCE)
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#define _GNU_SOURCE
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#endif
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#if !defined(_LARGEFILE_SOURCE)
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#define _LARGEFILE_SOURCE
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#endif
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#if !defined(_LARGEFILE64_SOURCE)
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#define _LARGEFILE64_SOURCE
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#endif
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#if !defined(_FILE_OFFSET_BITS)
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#define _FILE_OFFSET_BITS 64
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <getopt.h>
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#include <math.h>
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#include <errno.h>
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#include <sys/stat.h>
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#ifndef WIN32
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#if !defined(off64_t)
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#define off64_t off_t
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#endif
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#endif
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#ifdef WIN32
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#define fseeko fseeko64
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#define ftello ftello64
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#endif
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#ifdef _BIG_ENDIAN
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#define htonll(x) \
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((((x) & 0xff00000000000000LL) >> 56) | \
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(((x) & 0x00ff000000000000LL) >> 40) | \
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(((x) & 0x0000ff0000000000LL) >> 24) | \
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(((x) & 0x000000ff00000000LL) >> 8) | \
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(((x) & 0x00000000ff000000LL) << 8) | \
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(((x) & 0x0000000000ff0000LL) << 24) | \
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(((x) & 0x000000000000ff00LL) << 40) | \
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(((x) & 0x00000000000000ffLL) << 56))
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#else
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#define htonll(x) x
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#endif
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/*
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* os hash
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* based on public domain example from
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* http://trac.opensubtitles.org/projects/opensubtitles/wiki/HashSourceCodes
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*
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* plus modification for files < 64k, buffer is filled with file data and padded with 0
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*/
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unsigned long long gen_oshash(char const *filename) {
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FILE *file;
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int i;
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unsigned long long t1=0;
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unsigned long long buffer1[8192*2];
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int used = 8192*2;
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file = fopen(filename, "rb");
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if (file) {
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//add filesize
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fseeko(file, 0, SEEK_END);
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t1 = ftello(file);
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fseeko(file, 0, SEEK_SET);
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if(t1 < 65536) {
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used = t1/8;
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fread(buffer1, used, 8, file);
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} else {
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fread(buffer1, 8192, 8, file);
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fseeko(file, -65536, SEEK_END);
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fread(&buffer1[8192], 8192, 8, file);
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}
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for (i=0; i < used; i++)
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t1+=htonll(buffer1[i]);
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fclose(file);
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}
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return t1;
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}
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int print_oshash(FILE *output, char const *filename) {
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char hash[32];
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#ifdef WIN32
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sprintf(hash, "%016I64x", gen_oshash(filename));
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#elif defined (__SVR4) && defined (__sun)
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sprintf(hash,"%016llx", gen_oshash(filename));
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#else
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sprintf(hash, "%016qx", gen_oshash(filename));
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#endif
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if (strcmp(hash,"0000000000000000") > 0) {
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fprintf(output, "%s %s\n", hash, filename);
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return 0;
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} else {
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fprintf(stderr,"%s: No such file or permission denied\n",filename);
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return 1;
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}
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}
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int main(int argc, char **argv) {
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int i,r=0;
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FILE* output = stdout;
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if(argc == 1) {
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fprintf(stderr, "usage: %s [filename]\n", argv[0]);
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exit(1);
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}
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for(i=1;i<argc;i++)
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r+=print_oshash(output, argv[i]);
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return r>0?1:0;
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}
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