mirror of
https://git.notmuchmail.org/git/notmuch
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93 lines
2.4 KiB
C
93 lines
2.4 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 https://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 <glib.h>
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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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GChecksum *sha1;
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char *digest;
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sha1 = g_checksum_new (G_CHECKSUM_SHA1);
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g_checksum_update (sha1, (const guchar *) str, strlen (str) + 1);
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digest = xstrdup (g_checksum_get_string (sha1));
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g_checksum_free (sha1);
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return 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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GChecksum *sha1;
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char *digest = NULL;
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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 = g_checksum_new (G_CHECKSUM_SHA1);
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if (sha1 == NULL)
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goto DONE;
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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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goto DONE;
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} else {
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g_checksum_update (sha1, block, bytes_read);
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}
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}
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digest = xstrdup (g_checksum_get_string (sha1));
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DONE:
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if (sha1)
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g_checksum_free (sha1);
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if (file)
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fclose (file);
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return digest;
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}
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