1 files changed, 281 insertions, 0 deletions

diff --git a/src/libexif/canon/exif-mnote-data-canon.c b/src/libexif/canon/exif-mnote-data-canon.c
new file mode 100644
index 0000000..b1c5dab
--- /dev/null
+++ b/src/libexif/canon/exif-mnote-data-canon.c
@@ -0,0 +1,281 @@
+/* exif-mnote-data-canon.c
+ *
+ * Copyright © 2002, 2003 Lutz Müller <lutz@users.sourceforge.net>
+ * Copyright © 2003 Matthieu Castet <mat-c@users.sourceforge.net>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <config.h>
+#include "exif-mnote-data-canon.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <libexif/exif-byte-order.h>
+#include <libexif/exif-utils.h>
+#include <libexif/exif-data.h>
+
+#define DEBUG
+
+static void
+exif_mnote_data_canon_clear (ExifMnoteDataCanon *n)
+{
+	ExifMnoteData *d = (ExifMnoteData *) n;
+	unsigned int i;
+
+	if (!n) return;
+
+	if (n->entries) {
+		for (i = 0; i < n->count; i++)
+			if (n->entries[i].data) {
+				exif_mem_free (d->mem, n->entries[i].data);
+				n->entries[i].data = NULL;
+			}
+		exif_mem_free (d->mem, n->entries);
+		n->entries = NULL;
+		n->count = 0;
+	}
+}
+
+static void
+exif_mnote_data_canon_free (ExifMnoteData *n)
+{
+	if (!n) return;
+
+	exif_mnote_data_canon_clear ((ExifMnoteDataCanon *) n);
+}
+
+static char *
+exif_mnote_data_canon_get_value (ExifMnoteData *note, unsigned int n, char *val, unsigned int maxlen)
+{
+	ExifMnoteDataCanon *cnote = (ExifMnoteDataCanon *) note;
+
+	if (!note) return NULL;
+	if (cnote->count <= n) return NULL;
+	return mnote_canon_entry_get_value (&cnote->entries[n], val, maxlen);
+}
+
+static void
+exif_mnote_data_canon_set_byte_order (ExifMnoteData *d, ExifByteOrder o)
+{
+	ExifByteOrder o_orig;
+	ExifMnoteDataCanon *n = (ExifMnoteDataCanon *) d;
+	unsigned int i;
+
+	if (!n) return;
+
+	o_orig = n->order;
+	n->order = o;
+	for (i = 0; i < n->count; i++) {
+		n->entries[i].order = o;
+		exif_array_set_byte_order (n->entries[i].format, n->entries[i].data,
+				n->entries[i].components, o_orig, o);
+	}
+}
+
+static void
+exif_mnote_data_canon_set_offset (ExifMnoteData *n, unsigned int o)
+{
+	if (n) ((ExifMnoteDataCanon *) n)->offset = o;
+}
+
+static void
+exif_mnote_data_canon_save (ExifMnoteData *ne, 
+	unsigned char **buf, unsigned int *buf_size)
+{
+	ExifMnoteDataCanon *n = (ExifMnoteDataCanon *) ne;
+	unsigned int i, o, s, doff;
+
+	if (!n || !buf || !buf_size) return;
+
+	/*
+	 * Allocate enough memory for all entries and the number
+	 * of entries.
+	 */
+	*buf_size = 2 + n->count * 12 + 4;
+	*buf = exif_mem_alloc (ne->mem, sizeof (char) * *buf_size);
+	if (!*buf) return;
+
+	/* Save the number of entries */
+	exif_set_short (*buf, n->order, (ExifShort) n->count);
+	
+	/* Save each entry */
+	for (i = 0; i < n->count; i++) {
+		o = 2 + i * 12;
+		exif_set_short (*buf + o + 0, n->order, (ExifShort) n->entries[i].tag);
+		exif_set_short (*buf + o + 2, n->order, (ExifShort) n->entries[i].format);
+		exif_set_long  (*buf + o + 4, n->order,
+				n->entries[i].components);
+		o += 8;
+		s = exif_format_get_size (n->entries[i].format) *
+						n->entries[i].components;
+		if (s > 4) {
+			*buf_size += s;
+
+			/* Ensure even offsets. Set padding bytes to 0. */
+			if (s & 1) *buf_size += 1;
+			*buf = exif_mem_realloc (ne->mem, *buf,
+						 sizeof (char) * *buf_size);
+			if (!*buf) return;
+			doff = *buf_size - s;
+			if (s & 1) { doff--; *(*buf + *buf_size - 1) = '\0'; }
+			exif_set_long (*buf + o, n->order, n->offset + doff);
+		} else
+			doff = o;
+
+		/*
+		 * Write the data. Fill unneeded bytes with 0. Do not
+		 * crash if data is NULL.
+		 */
+		if (!n->entries[i].data) memset (*buf + doff, 0, s);
+		else memcpy (*buf + doff, n->entries[i].data, s);
+		if (s < 4) memset (*buf + doff + s, 0, (4 - s));
+	}
+}
+
+/* XXX
+ * FIXME: exif_mnote_data_canon_load() may fail and there is no
+ *        semantics to express that.
+ *        See bug #1054323 for details, especially the comment by liblit
+ *        after it has supposedly been fixed:
+ *
+ *        https://sourceforge.net/tracker/?func=detail&aid=1054323&group_id=12272&atid=112272
+ *        Unfortunately, the "return" statements aren't commented at
+ *        all, so it isn't trivial to find out what is a normal
+ *        return, and what is a reaction to an error condition.
+ */
+
+static void
+exif_mnote_data_canon_load (ExifMnoteData *ne,
+	const unsigned char *buf, unsigned int buf_size)
+{
+	ExifMnoteDataCanon *n = (ExifMnoteDataCanon *) ne;
+	ExifShort c;
+	unsigned int i, o, s;
+
+	if (!n || !buf || !buf_size || (buf_size < 6 + n->offset + 2)) return;
+
+	/* Read the number of entries and remove old ones. */
+	c = exif_get_short (buf + 6 + n->offset, n->order);
+	exif_mnote_data_canon_clear (n);
+
+	/* Parse the entries */
+	for (i = 0; i < c; i++) {
+	    o = 6 + 2 + n->offset + 12 * i;
+	    if (o + 8 > buf_size) return;
+
+	    n->count = i + 1;
+	    n->entries = exif_mem_realloc (ne->mem, n->entries,
+					   sizeof (MnoteCanonEntry) * (i+1));
+	    memset (&n->entries[i], 0, sizeof (MnoteCanonEntry));
+	    n->entries[i].tag        = exif_get_short (buf + o, n->order);
+	    n->entries[i].format     = exif_get_short (buf + o + 2, n->order);
+	    n->entries[i].components = exif_get_long (buf + o + 4, n->order);
+	    n->entries[i].order      = n->order;
+
+	    /*
+	     * Size? If bigger than 4 bytes, the actual data is not
+	     * in the entry but somewhere else (offset).
+	     */
+	    s = exif_format_get_size (n->entries[i].format) *
+		    		      n->entries[i].components;
+	    if (!s) return;
+	    o += 8;
+	    if (s > 4) o = exif_get_long (buf + o, n->order) + 6;
+	    if (o + s > buf_size) return;
+	    
+	    /* Sanity check */
+	    n->entries[i].data = exif_mem_alloc (ne->mem, sizeof (char) * s);
+	    if (!n->entries[i].data) return;
+	    n->entries[i].size = s;
+	    memcpy (n->entries[i].data, buf + o, s);
+	}
+}
+
+static unsigned int
+exif_mnote_data_canon_count (ExifMnoteData *n)
+{
+	return n ? ((ExifMnoteDataCanon *) n)->count : 0;
+}
+
+static unsigned int
+exif_mnote_data_canon_get_id (ExifMnoteData *d, unsigned int n)
+{
+	ExifMnoteDataCanon *note = (ExifMnoteDataCanon *) d;
+
+	if (!note) return 0;
+	if (note->count <= n) return 0;
+	return note->entries[n].tag;
+}
+
+static const char *
+exif_mnote_data_canon_get_name (ExifMnoteData *note, unsigned int i)
+{
+	ExifMnoteDataCanon *cnote = (ExifMnoteDataCanon *) note;
+
+	if (!note) return NULL;
+	if (i >= cnote->count) return NULL;
+	return mnote_canon_tag_get_name (cnote->entries[i].tag);
+}
+
+static const char *
+exif_mnote_data_canon_get_title (ExifMnoteData *note, unsigned int i)
+{
+	ExifMnoteDataCanon *cnote = (ExifMnoteDataCanon *) note;
+
+	if (!note) return NULL;
+	if (i >= cnote->count) return NULL;
+	return mnote_canon_tag_get_title (cnote->entries[i].tag);
+}
+
+static const char *
+exif_mnote_data_canon_get_description (ExifMnoteData *note, unsigned int i)
+{
+	ExifMnoteDataCanon *cnote = (ExifMnoteDataCanon *) note;
+	if (!note) return NULL;
+	if (i >= cnote->count) return NULL;
+	return mnote_canon_tag_get_description (cnote->entries[i].tag);
+}
+
+ExifMnoteData *
+exif_mnote_data_canon_new (ExifMem *mem)
+{
+	ExifMnoteData *d;
+
+	if (!mem) return NULL;
+
+	d = exif_mem_alloc (mem, sizeof (ExifMnoteDataCanon));
+	if (!d) return NULL;
+
+	exif_mnote_data_construct (d, mem);
+
+	/* Set up function pointers */
+	d->methods.free            = exif_mnote_data_canon_free;
+	d->methods.set_byte_order  = exif_mnote_data_canon_set_byte_order;
+	d->methods.set_offset      = exif_mnote_data_canon_set_offset;
+	d->methods.load            = exif_mnote_data_canon_load;
+	d->methods.save            = exif_mnote_data_canon_save;
+	d->methods.count           = exif_mnote_data_canon_count;
+	d->methods.get_id          = exif_mnote_data_canon_get_id;
+	d->methods.get_name        = exif_mnote_data_canon_get_name;
+	d->methods.get_title       = exif_mnote_data_canon_get_title;
+	d->methods.get_description = exif_mnote_data_canon_get_description;
+	d->methods.get_value       = exif_mnote_data_canon_get_value;
+
+	return d;
+}