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| | /* sha1.c - Interfaces to SHA-1 hash for the notmuch mail system
*
* Copyright © 2009 Carl Worth
*
* 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, see https://www.gnu.org/licenses/ .
*
* Author: Carl Worth <cworth@cworth.org>
*/
#include "notmuch-private.h"
#include <glib.h>
/* Create a hexadecimal string version of the SHA-1 digest of 'str'
* (including its null terminating character).
*
* This function returns a newly allocated string which the caller
* should free() when finished.
*/
char *
_notmuch_sha1_of_string (const char *str)
{
GChecksum *sha1;
char *digest;
sha1 = g_checksum_new (G_CHECKSUM_SHA1);
g_checksum_update (sha1, (const guchar *) str, strlen (str) + 1);
digest = xstrdup (g_checksum_get_string (sha1));
g_checksum_free (sha1);
return digest;
}
/* Create a hexadecimal string version of the SHA-1 digest of the
* contents of the named file.
*
* This function returns a newly allocated string which the caller
* should free() when finished.
*
* If any error occurs while reading the file, (permission denied,
* file not found, etc.), this function returns NULL.
*/
char *
_notmuch_sha1_of_file (const char *filename)
{
FILE *file;
#define BLOCK_SIZE 4096
unsigned char block[BLOCK_SIZE];
size_t bytes_read;
GChecksum *sha1;
char *digest = NULL;
file = fopen (filename, "r");
if (file == NULL)
return NULL;
sha1 = g_checksum_new (G_CHECKSUM_SHA1);
if (sha1 == NULL)
goto DONE;
while (1) {
bytes_read = fread (block, 1, 4096, file);
if (bytes_read == 0) {
if (feof (file))
break;
else if (ferror (file))
goto DONE;
} else {
g_checksum_update (sha1, block, bytes_read);
}
}
digest = xstrdup (g_checksum_get_string (sha1));
DONE:
if (sha1)
g_checksum_free (sha1);
if (file)
fclose (file);
return digest;
}
|