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Replace the copy-and-paste MD5 digest generation with GChecksum.
2007-12-04 Emmanuele Bassi <ebassi@gnome.org> * gio/glocalfileinfo.c: Replace the copy-and-paste MD5 digest generation with GChecksum. svn path=/trunk/; revision=6043
This commit is contained in:
Emmanuele Bassi
Emmanuele Bassi
parent
f17db34652
commit
d013d46b98
@ -1,3 +1,8 @@
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2007-12-04 Emmanuele Bassi <ebassi@gnome.org>
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* gio/glocalfileinfo.c: Replace the copy-and-paste MD5 digest
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generation with GChecksum.
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2007-12-04 Emmanuele Bassi <ebassi@gnome.org>
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* glib/gchecksum.[ch]: Add GChecksum, a generic wrapper around
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@ -52,6 +52,8 @@
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#endif /* HAVE_XATTR */
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#include <glib/gstdio.h>
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#include <glib/gchecksum.h>
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#include "glibintl.h"
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#include "glocalfileinfo.h"
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@ -79,8 +81,6 @@ static GHashTable *uid_cache = NULL;
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G_LOCK_DEFINE_STATIC (gid_cache);
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static GHashTable *gid_cache = NULL;
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static void thumb_md5 (const char *string, unsigned char digest[16]);
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char *
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_g_local_file_info_create_etag (struct stat *statbuf)
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{
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@ -1189,53 +1189,37 @@ get_content_type (const char *basename,
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}
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static char *
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thumb_digest_to_ascii (unsigned char digest[16],
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const char *suffix)
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{
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static const char hex_digits[] = "0123456789abcdef";
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char *res;
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int i;
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res = g_malloc (33 + strlen (suffix));
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for (i = 0; i < 16; i++)
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{
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res[2*i] = hex_digits[digest[i] >> 4];
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res[2*i+1] = hex_digits[digest[i] & 0xf];
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}
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res[32] = 0;
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strcat (res, suffix);
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return res;
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}
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static void
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get_thumbnail_attributes (const char *path,
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GFileInfo *info)
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{
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GChecksum *checksum;
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char *uri;
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unsigned char digest[16];
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char *filename;
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char *basename;
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uri = g_filename_to_uri (path, NULL, NULL);
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thumb_md5 (uri, digest);
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g_free (uri);
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basename = thumb_digest_to_ascii (digest, ".png");
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checksum = g_checksum_new (G_CHECKSUM_MD5);
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g_checksum_update (checksum, (const gchar *) uri, strlen (uri));
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filename = g_build_filename (g_get_home_dir(), ".thumbnails", "normal", basename, NULL);
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basename = g_strconcat (g_checksum_get_string (checksum), ".png", NULL);
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g_checksum_free (checksum);
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filename = g_build_filename (g_get_home_dir(),
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".thumbnails", "normal", basename,
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NULL);
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if (g_file_test (filename, G_FILE_TEST_IS_REGULAR))
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g_file_info_set_attribute_byte_string (info, G_FILE_ATTRIBUTE_THUMBNAIL_PATH, filename);
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else
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{
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g_free (filename);
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filename = g_build_filename (g_get_home_dir(), ".thumbnails", "fail", "gnome-thumbnail-factory", basename, NULL);
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filename = g_build_filename (g_get_home_dir(),
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".thumbnails", "fail",
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"gnome-thumbnail-factory",
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basename,
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NULL);
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if (g_file_test (filename, G_FILE_TEST_IS_REGULAR))
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g_file_info_set_attribute_boolean (info, G_FILE_ATTRIBUTE_THUMBNAILING_FAILED, TRUE);
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@ -1973,282 +1957,3 @@ _g_local_file_info_set_attributes (char *filename,
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return res;
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}
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/*
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* This code implements the MD5 message-digest algorithm.
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* The algorithm is due to Ron Rivest. This code was
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* written by Colin Plumb in 1993, no copyright is claimed.
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* This code is in the public domain; do with it what you wish.
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*
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* Equivalent code is available from RSA Data Security, Inc.
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* This code has been tested against that, and is equivalent,
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* except that you don't need to include two pages of legalese
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* with every copy.
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*
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* To compute the message digest of a chunk of bytes, declare an
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* ThumbMD5Context structure, pass it to thumb_md5_init, call
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* thumb_md5_update as needed on buffers full of bytes, and then call
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* thumb_md5_final, which will fill a supplied 32-byte array with the
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* digest in ascii form.
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*
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*/
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static void thumb_md5_init (struct ThumbMD5Context *context);
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static void thumb_md5_update (struct ThumbMD5Context *context,
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unsigned char const *buf,
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unsigned len);
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static void thumb_md5_final (unsigned char digest[16],
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struct ThumbMD5Context *context);
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static void thumb_md5_transform (guint32 buf[4],
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guint32 const in[16]);
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static void
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thumb_md5 (const char *string, unsigned char digest[16])
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{
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struct ThumbMD5Context md5_context;
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thumb_md5_init (&md5_context);
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thumb_md5_update (&md5_context, (unsigned char *)string, strlen (string));
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thumb_md5_final (digest, &md5_context);
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}
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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#define byteReverse(buf, len) /* Nothing */
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#else
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/*
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* Note: this code is harmless on little-endian machines.
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*/
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static void
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byteReverse (unsigned char *buf,
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unsigned longs)
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{
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guint32 t;
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do {
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t = (guint32) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
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((unsigned) buf[1] << 8 | buf[0]);
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*(guint32 *) buf = t;
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buf += 4;
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} while (--longs);
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}
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#endif
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/*
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* Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
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* initialization constants.
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*/
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static void
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thumb_md5_init (struct ThumbMD5Context *ctx)
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{
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ctx->buf[0] = 0x67452301;
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ctx->buf[1] = 0xefcdab89;
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ctx->buf[2] = 0x98badcfe;
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ctx->buf[3] = 0x10325476;
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ctx->bits[0] = 0;
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ctx->bits[1] = 0;
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}
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/*
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* Update context to reflect the concatenation of another buffer full
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* of bytes.
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*/
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static void
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thumb_md5_update (struct ThumbMD5Context *ctx,
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unsigned char const *buf,
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unsigned len)
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{
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guint32 t;
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/* Update bitcount */
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t = ctx->bits[0];
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if ((ctx->bits[0] = t + ((guint32) len << 3)) < t)
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ctx->bits[1]++; /* Carry from low to high */
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ctx->bits[1] += len >> 29;
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t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
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/* Handle any leading odd-sized chunks */
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if (t) {
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unsigned char *p = (unsigned char *) ctx->in + t;
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t = 64 - t;
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if (len < t) {
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memcpy (p, buf, len);
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return;
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}
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memcpy (p, buf, t);
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byteReverse (ctx->in, 16);
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thumb_md5_transform (ctx->buf, (guint32 *) ctx->in);
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buf += t;
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len -= t;
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}
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/* Process data in 64-byte chunks */
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while (len >= 64) {
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memcpy (ctx->in, buf, 64);
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byteReverse (ctx->in, 16);
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thumb_md5_transform (ctx->buf, (guint32 *) ctx->in);
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buf += 64;
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len -= 64;
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}
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/* Handle any remaining bytes of data. */
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memcpy(ctx->in, buf, len);
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}
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/*
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* Final wrapup - pad to 64-byte boundary with the bit pattern
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* 1 0* (64-bit count of bits processed, MSB-first)
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*/
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static void
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thumb_md5_final (unsigned char digest[16],
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struct ThumbMD5Context *ctx)
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{
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unsigned count;
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unsigned char *p;
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/* Compute number of bytes mod 64 */
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count = (ctx->bits[0] >> 3) & 0x3F;
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/* Set the first char of padding to 0x80. This is safe since there is
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always at least one byte free */
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p = ctx->in + count;
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*p++ = 0x80;
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/* Bytes of padding needed to make 64 bytes */
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count = 64 - 1 - count;
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/* Pad out to 56 mod 64 */
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if (count < 8) {
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/* Two lots of padding: Pad the first block to 64 bytes */
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memset (p, 0, count);
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byteReverse (ctx->in, 16);
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thumb_md5_transform (ctx->buf, (guint32 *) ctx->in);
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/* Now fill the next block with 56 bytes */
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memset(ctx->in, 0, 56);
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} else {
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/* Pad block to 56 bytes */
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memset(p, 0, count - 8);
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}
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byteReverse(ctx->in, 14);
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/* Append length in bits and transform */
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((guint32 *) ctx->in)[14] = ctx->bits[0];
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((guint32 *) ctx->in)[15] = ctx->bits[1];
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thumb_md5_transform (ctx->buf, (guint32 *) ctx->in);
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byteReverse ((unsigned char *) ctx->buf, 4);
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memcpy (digest, ctx->buf, 16);
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memset (ctx, 0, sizeof(ctx)); /* In case it's sensitive */
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}
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/* The four core functions - F1 is optimized somewhat */
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#define F1(x, y, z) (z ^ (x & (y ^ z)))
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#define F2(x, y, z) F1 (z, x, y)
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#define F3(x, y, z) (x ^ y ^ z)
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#define F4(x, y, z) (y ^ (x | ~z))
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/* This is the central step in the MD5 algorithm. */
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#define thumb_md5_step(f, w, x, y, z, data, s) \
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( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
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/*
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* The core of the MD5 algorithm, this alters an existing MD5 hash to
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* reflect the addition of 16 longwords of new data. ThumbMD5Update blocks
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* the data and converts bytes into longwords for this routine.
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*/
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static void
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thumb_md5_transform (guint32 buf[4],
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guint32 const in[16])
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{
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register guint32 a, b, c, d;
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a = buf[0];
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b = buf[1];
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c = buf[2];
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d = buf[3];
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thumb_md5_step(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
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thumb_md5_step(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
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thumb_md5_step(F1, c, d, a, b, in[2] + 0x242070db, 17);
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thumb_md5_step(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
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thumb_md5_step(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
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thumb_md5_step(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
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thumb_md5_step(F1, c, d, a, b, in[6] + 0xa8304613, 17);
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thumb_md5_step(F1, b, c, d, a, in[7] + 0xfd469501, 22);
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thumb_md5_step(F1, a, b, c, d, in[8] + 0x698098d8, 7);
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thumb_md5_step(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
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thumb_md5_step(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
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thumb_md5_step(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
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thumb_md5_step(F1, a, b, c, d, in[12] + 0x6b901122, 7);
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thumb_md5_step(F1, d, a, b, c, in[13] + 0xfd987193, 12);
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thumb_md5_step(F1, c, d, a, b, in[14] + 0xa679438e, 17);
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thumb_md5_step(F1, b, c, d, a, in[15] + 0x49b40821, 22);
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thumb_md5_step(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
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thumb_md5_step(F2, d, a, b, c, in[6] + 0xc040b340, 9);
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thumb_md5_step(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
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thumb_md5_step(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
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thumb_md5_step(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
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thumb_md5_step(F2, d, a, b, c, in[10] + 0x02441453, 9);
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thumb_md5_step(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
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thumb_md5_step(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
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thumb_md5_step(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
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thumb_md5_step(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
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thumb_md5_step(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
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thumb_md5_step(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
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thumb_md5_step(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
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thumb_md5_step(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
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thumb_md5_step(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
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thumb_md5_step(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
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thumb_md5_step(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
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thumb_md5_step(F3, d, a, b, c, in[8] + 0x8771f681, 11);
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thumb_md5_step(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
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thumb_md5_step(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
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thumb_md5_step(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
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thumb_md5_step(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
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thumb_md5_step(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
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thumb_md5_step(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
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thumb_md5_step(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
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thumb_md5_step(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
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thumb_md5_step(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
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thumb_md5_step(F3, b, c, d, a, in[6] + 0x04881d05, 23);
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thumb_md5_step(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
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thumb_md5_step(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
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thumb_md5_step(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
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thumb_md5_step(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
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thumb_md5_step(F4, a, b, c, d, in[0] + 0xf4292244, 6);
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thumb_md5_step(F4, d, a, b, c, in[7] + 0x432aff97, 10);
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thumb_md5_step(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
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thumb_md5_step(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
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thumb_md5_step(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
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thumb_md5_step(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
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thumb_md5_step(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
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thumb_md5_step(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
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thumb_md5_step(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
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thumb_md5_step(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
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thumb_md5_step(F4, c, d, a, b, in[6] + 0xa3014314, 15);
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thumb_md5_step(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
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thumb_md5_step(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
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thumb_md5_step(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
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thumb_md5_step(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
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thumb_md5_step(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
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buf[0] += a;
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buf[1] += b;
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buf[2] += c;
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buf[3] += d;
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}
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