mirror of
https://git.notmuchmail.org/git/notmuch
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cf09631a45
Cleaned the following whitespace in lib/* files: lib/index.cc: 1 line: trailing whitespace lib/database.cc 5 lines: 8 spaces at the beginning of line lib/notmuch-private.h: 4 lines: 8 spaces at the beginning of line lib/message.cc: 1 line: trailing whitespace lib/sha1.c: 1 line: empty lines at the end of file lib/query.cc: 2 lines: 8 spaces at the beginning of line lib/gen-version-script.sh: 1 line: trailing whitespace
114 lines
2.7 KiB
C
114 lines
2.7 KiB
C
/* sha1.c - Interfaces to SHA-1 hash for the notmuch mail system
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*
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* Copyright © 2009 Carl Worth
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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 3 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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* Author: Carl Worth <cworth@cworth.org>
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*/
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#include "notmuch-private.h"
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#include "libsha1.h"
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/* Just some simple interfaces on top of libsha1 so that we can leave
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* libsha1 as untouched as possible. */
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static char *
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_hex_of_sha1_digest (const unsigned char digest[SHA1_DIGEST_SIZE])
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{
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char *result, *r;
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int i;
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result = xcalloc (SHA1_DIGEST_SIZE * 2 + 1, 1);
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for (r = result, i = 0;
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i < SHA1_DIGEST_SIZE;
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r += 2, i++)
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{
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sprintf (r, "%02x", digest[i]);
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}
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return result;
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}
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/* Create a hexadecimal string version of the SHA-1 digest of 'str'
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* (including its null terminating character).
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*
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* This function returns a newly allocated string which the caller
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* should free() when finished.
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*/
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char *
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_notmuch_sha1_of_string (const char *str)
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{
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sha1_ctx sha1;
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unsigned char digest[SHA1_DIGEST_SIZE];
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sha1_begin (&sha1);
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sha1_hash ((unsigned char *) str, strlen (str) + 1, &sha1);
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sha1_end (digest, &sha1);
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return _hex_of_sha1_digest (digest);
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}
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/* Create a hexadecimal string version of the SHA-1 digest of the
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* contents of the named file.
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*
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* This function returns a newly allocated string which the caller
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* should free() when finished.
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*
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* If any error occurs while reading the file, (permission denied,
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* file not found, etc.), this function returns NULL.
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*/
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char *
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_notmuch_sha1_of_file (const char *filename)
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{
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FILE *file;
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#define BLOCK_SIZE 4096
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unsigned char block[BLOCK_SIZE];
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size_t bytes_read;
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sha1_ctx sha1;
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unsigned char digest[SHA1_DIGEST_SIZE];
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char *result;
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file = fopen (filename, "r");
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if (file == NULL)
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return NULL;
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sha1_begin (&sha1);
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while (1) {
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bytes_read = fread (block, 1, 4096, file);
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if (bytes_read == 0) {
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if (feof (file)) {
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break;
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} else if (ferror (file)) {
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fclose (file);
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return NULL;
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}
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} else {
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sha1_hash (block, bytes_read, &sha1);
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}
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}
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sha1_end (digest, &sha1);
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result = _hex_of_sha1_digest (digest);
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fclose (file);
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return result;
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}
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