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/*
* Copyright (C) 2002 Andrew Tridgell
* Copyright (C) 2010 Joel Rosdahl
*
* This program 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 3 of the License, or (at your option)
* any later version.
*
* This program 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
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "ccache.h"
#define HASH_DELIMITER "\000cCaChE"
void
hash_start(struct mdfour *md)
{
mdfour_begin(md);
}
void
hash_buffer(struct mdfour *md, const void *s, size_t len)
{
mdfour_update(md, (unsigned char *)s, len);
}
/* Return the hash result as a hex string. Caller frees. */
char *
hash_result(struct mdfour *md)
{
unsigned char sum[16];
hash_result_as_bytes(md, sum);
return format_hash_as_string(sum, (unsigned) md->totalN);
}
/* return the hash result as 16 binary bytes */
void
hash_result_as_bytes(struct mdfour *md, unsigned char *out)
{
hash_buffer(md, NULL, 0);
mdfour_result(md, out);
}
bool
hash_equal(struct mdfour *md1, struct mdfour *md2)
{
unsigned char sum1[16], sum2[16];
hash_result_as_bytes(md1, sum1);
hash_result_as_bytes(md2, sum2);
return memcmp(sum1, sum2, sizeof(sum1)) == 0;
}
/*
* Hash some data that is unlikely to occur in the input. The idea is twofold:
*
* - Delimit things like arguments from each other (e.g., so that -I -O2 and
* -I-O2 hash differently).
* - Tag different types of hashed information so that it's possible to do
* conditional hashing of information in a safe way (e.g., if we want to hash
* information X if CCACHE_A is set and information Y if CCACHE_B is set,
* there should never be a hash collision risk).
*/
void
hash_delimiter(struct mdfour *md, const char *type)
{
hash_buffer(md, HASH_DELIMITER, sizeof(HASH_DELIMITER));
hash_buffer(md, type, strlen(type) + 1); /* Include NUL. */
}
void
hash_string(struct mdfour *md, const char *s)
{
hash_buffer(md, s, strlen(s));
}
void
hash_int(struct mdfour *md, int x)
{
hash_buffer(md, (char *)&x, sizeof(x));
}
/*
* Add contents of an open file to the hash. Returns true on success, otherwise
* false.
*/
bool
hash_fd(struct mdfour *md, int fd)
{
char buf[16384];
ssize_t n;
while ((n = read(fd, buf, sizeof(buf))) != 0) {
if (n == -1 && errno != EINTR) {
break;
}
if (n > 0) {
hash_buffer(md, buf, n);
}
}
return n == 0;
}
/*
* Add contents of a file to the hash. Returns true on success, otherwise
* false.
*/
bool
hash_file(struct mdfour *md, const char *fname)
{
int fd;
bool ret;
fd = open(fname, O_RDONLY|O_BINARY);
if (fd == -1) {
return false;
}
ret = hash_fd(md, fd);
close(fd);
return ret;
}
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