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/* $Id$ */
/***
This file is part of syrep.
syrep 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.
syrep 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 syrep; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <unistd.h>
#include <sys/mman.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "md5util.h"
#include "md5.h"
#include "syrep.h"
void fhex(const unsigned char *bin, int len, char *txt) {
static const char hex[] = "0123456789abcdef";
int i;
for (i = 0; i < len; i++) {
txt[i*2] = hex[bin[i]>>4];
txt[i*2+1] = hex[bin[i]&0xF];
}
}
#define MMAPSIZE (100*1024*1024)
#define BUFSIZE (1024*1024)
int fdmd5(int fd, off_t l, char *md) {
void *d;
off_t o = 0;
size_t m;
int r = -1;
md5_state_t s;
struct stat pre, post;
void *p = NULL;
md5_init(&s);
if (fstat(fd, &pre) < 0) {
fprintf(stderr, "fstat(): %s\n", strerror(errno));
goto finish;
}
if (l == (off_t) -1)
l = pre.st_size;
if (l > BUFSIZE) {
m = l < MMAPSIZE ? l : MMAPSIZE;
while (l && ((d = mmap(NULL, m, PROT_READ, MAP_SHARED, fd, o)) != MAP_FAILED)) {
md5_append(&s, d, m);
munmap(d, m);
if (interrupted) {
fprintf(stderr, "Canceled.\n");
goto finish;
}
o += m;
l -= m;
m = l < MMAPSIZE ? l : MMAPSIZE;
}
if (l > 0)
fprintf(stderr, "mmap() failed: %s\n", strerror(errno));
}
if (l > 0) {
if (!(p = malloc(BUFSIZE))) {
fprintf(stderr, "malloc(): %s\n", strerror(errno));
goto finish;
}
while (l) {
ssize_t r;
if ((r = read(fd, p, BUFSIZE)) < 0) {
fprintf(stderr, "read(): %s\n", strerror(errno));
goto finish;
}
if (!r)
break;
md5_append(&s, p, r);
l -= r;
}
}
if (fstat(fd, &post) < 0) {
fprintf(stderr, "fstat(): %s\n", strerror(errno));
goto finish;
}
if (pre.st_mtime != post.st_mtime) {
fprintf(stderr, "File modified while calculating digest.\n");
goto finish;
}
md5_finish(&s, md);
r = 0;
finish:
if (p)
free(p);
return r;
}
int fmd5(const char *fn, char *md) {
int fd = -1, r = -1;
if ((fd = open(fn, O_RDONLY)) < 0) {
fprintf(stderr, "open(\"%s\"): %s\n", fn, strerror(errno));
goto finish;
}
r = fdmd5(fd, (off_t) -1, md);
finish:
if (fd >= 0)
close(fd);
return r;
}
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