mirror of
https://github.com/reactos/ccache.git
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132 lines
3.0 KiB
C
132 lines
3.0 KiB
C
/*
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* Copyright (C) 2002 Andrew Tridgell
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* Copyright (C) 2010 Joel Rosdahl
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 3 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "ccache.h"
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#define HASH_DELIMITER "\000cCaChE"
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void
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hash_start(struct mdfour *md)
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{
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mdfour_begin(md);
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}
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void
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hash_buffer(struct mdfour *md, const void *s, size_t len)
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{
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mdfour_update(md, (unsigned char *)s, len);
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}
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/* Return the hash result as a hex string. Caller frees. */
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char *
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hash_result(struct mdfour *md)
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{
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unsigned char sum[16];
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hash_result_as_bytes(md, sum);
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return format_hash_as_string(sum, (unsigned) md->totalN);
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}
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/* return the hash result as 16 binary bytes */
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void
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hash_result_as_bytes(struct mdfour *md, unsigned char *out)
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{
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hash_buffer(md, NULL, 0);
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mdfour_result(md, out);
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}
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bool
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hash_equal(struct mdfour *md1, struct mdfour *md2)
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{
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unsigned char sum1[16], sum2[16];
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hash_result_as_bytes(md1, sum1);
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hash_result_as_bytes(md2, sum2);
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return memcmp(sum1, sum2, sizeof(sum1)) == 0;
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}
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/*
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* Hash some data that is unlikely to occur in the input. The idea is twofold:
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*
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* - Delimit things like arguments from each other (e.g., so that -I -O2 and
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* -I-O2 hash differently).
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* - Tag different types of hashed information so that it's possible to do
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* conditional hashing of information in a safe way (e.g., if we want to hash
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* information X if CCACHE_A is set and information Y if CCACHE_B is set,
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* there should never be a hash collision risk).
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*/
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void
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hash_delimiter(struct mdfour *md, const char *type)
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{
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hash_buffer(md, HASH_DELIMITER, sizeof(HASH_DELIMITER));
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hash_buffer(md, type, strlen(type) + 1); /* Include NUL. */
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}
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void
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hash_string(struct mdfour *md, const char *s)
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{
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hash_buffer(md, s, strlen(s));
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}
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void
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hash_int(struct mdfour *md, int x)
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{
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hash_buffer(md, (char *)&x, sizeof(x));
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}
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/*
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* Add contents of an open file to the hash. Returns true on success, otherwise
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* false.
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*/
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bool
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hash_fd(struct mdfour *md, int fd)
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{
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char buf[16384];
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ssize_t n;
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while ((n = read(fd, buf, sizeof(buf))) != 0) {
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if (n == -1 && errno != EINTR) {
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break;
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}
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if (n > 0) {
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hash_buffer(md, buf, n);
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}
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}
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return n == 0;
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}
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/*
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* Add contents of a file to the hash. Returns true on success, otherwise
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* false.
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*/
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bool
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hash_file(struct mdfour *md, const char *fname)
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{
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int fd;
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bool ret;
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fd = open(fname, O_RDONLY|O_BINARY);
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if (fd == -1) {
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return false;
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}
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ret = hash_fd(md, fd);
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close(fd);
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return ret;
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}
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