mirror of
https://git.notmuchmail.org/git/notmuch
synced 2024-11-22 10:58:10 +01:00
6b228e4509
We'll be using this for storing really long terms in the database and when we just need to look them up, (and never read back the original data directly from the database). For example, storing arbitrarily long directory paths in the database along with mtime timestamps. Note that if we did want to store arbitrarily long terms and also be able to read them back, the Xapian folks recommending splitting the term off with multiple prefixes. See the note near the end of this page: http://trac.xapian.org/wiki/FAQ/UniqueIds
115 lines
2.7 KiB
C
115 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 hexadcimal 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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