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-rw-r--r--app/xcf/xcf-read.c274
1 files changed, 274 insertions, 0 deletions
diff --git a/app/xcf/xcf-read.c b/app/xcf/xcf-read.c
new file mode 100644
index 0000000..1c53436
--- /dev/null
+++ b/app/xcf/xcf-read.c
@@ -0,0 +1,274 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * 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/>.
+ */
+
+#include "config.h"
+
+#include <gio/gio.h>
+
+#include "libgimpbase/gimpbase.h"
+
+#include "core/core-types.h"
+
+#include "xcf-private.h"
+#include "xcf-read.h"
+
+#include "gimp-intl.h"
+
+
+#define MAX_XCF_STRING_LEN (16L * 1024 * 1024)
+
+
+guint
+xcf_read_int8 (XcfInfo *info,
+ guint8 *data,
+ gint count)
+{
+ gsize bytes_read = 0;
+
+ /* we allow for 'data == NULL && count == 0', which g_input_stream_read_all()
+ * rejects.
+ */
+ if (count > 0)
+ {
+ g_input_stream_read_all (info->input, data, count,
+ &bytes_read, NULL, NULL);
+
+ info->cp += bytes_read;
+ }
+
+ return bytes_read;
+}
+
+guint
+xcf_read_int16 (XcfInfo *info,
+ guint16 *data,
+ gint count)
+{
+ guint total = 0;
+
+ if (count > 0)
+ {
+ total += xcf_read_int8 (info, (guint8 *) data, count * 2);
+
+ while (count--)
+ {
+ *data = g_ntohs (*data);
+ data++;
+ }
+ }
+
+ return total;
+}
+
+guint
+xcf_read_int32 (XcfInfo *info,
+ guint32 *data,
+ gint count)
+{
+ guint total = 0;
+
+ if (count > 0)
+ {
+ total += xcf_read_int8 (info, (guint8 *) data, count * 4);
+
+ while (count--)
+ {
+ *data = g_ntohl (*data);
+ data++;
+ }
+ }
+
+ return total;
+}
+
+guint
+xcf_read_int64 (XcfInfo *info,
+ guint64 *data,
+ gint count)
+{
+ guint total = 0;
+
+ if (count > 0)
+ {
+ total += xcf_read_int8 (info, (guint8 *) data, count * 8);
+
+ while (count--)
+ {
+ *data = GINT64_FROM_BE (*data);
+ data++;
+ }
+ }
+
+ return total;
+}
+
+guint
+xcf_read_offset (XcfInfo *info,
+ goffset *data,
+ gint count)
+{
+ guint total = 0;
+
+ if (count > 0)
+ {
+ if (info->bytes_per_offset == 4)
+ {
+ gint32 *int_offsets = g_alloca (count * sizeof (gint32));
+
+ total += xcf_read_int8 (info, (guint8 *) int_offsets, count * 4);
+
+ while (count--)
+ {
+ *data = g_ntohl (*int_offsets);
+ int_offsets++;
+ data++;
+ }
+ }
+ else
+ {
+ total += xcf_read_int8 (info, (guint8 *) data, count * 8);
+
+ while (count--)
+ {
+ *data = GINT64_FROM_BE (*data);
+ data++;
+ }
+ }
+ }
+
+ return total;
+}
+
+guint
+xcf_read_float (XcfInfo *info,
+ gfloat *data,
+ gint count)
+{
+ return xcf_read_int32 (info, (guint32 *) ((void *) data), count);
+}
+
+guint
+xcf_read_string (XcfInfo *info,
+ gchar **data,
+ gint count)
+{
+ guint total = 0;
+ gint i;
+
+ for (i = 0; i < count; i++)
+ {
+ guint32 tmp;
+
+ total += xcf_read_int32 (info, &tmp, 1);
+
+ if (tmp > MAX_XCF_STRING_LEN)
+ {
+ g_warning ("Maximum string length (%ld bytes) exceeded. "
+ "Possibly corrupt XCF file.", MAX_XCF_STRING_LEN);
+ data[i] = NULL;
+ }
+ else if (tmp > 0)
+ {
+ gchar *str;
+
+ str = g_new (gchar, tmp);
+ total += xcf_read_int8 (info, (guint8*) str, tmp);
+
+ if (str[tmp - 1] != '\0')
+ str[tmp - 1] = '\0';
+
+ data[i] = gimp_any_to_utf8 (str, -1,
+ _("Invalid UTF-8 string in XCF file"));
+
+ g_free (str);
+ }
+ else
+ {
+ data[i] = NULL;
+ }
+ }
+
+ return total;
+}
+
+guint
+xcf_read_component (XcfInfo *info,
+ gint bpc,
+ guint8 *data,
+ gint count)
+{
+ switch (bpc)
+ {
+ case 1:
+ return xcf_read_int8 (info, data, count);
+
+ case 2:
+ return xcf_read_int16 (info, (guint16 *) data, count);
+
+ case 4:
+ return xcf_read_int32 (info, (guint32 *) data, count);
+
+ case 8:
+ return xcf_read_int64 (info, (guint64 *) data, count);
+
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+void
+xcf_read_from_be (gint bpc,
+ guint8 *data,
+ gint count)
+{
+ gint i;
+
+ switch (bpc)
+ {
+ case 1:
+ break;
+
+ case 2:
+ {
+ guint16 *d = (guint16 *) data;
+
+ for (i = 0; i < count; i++)
+ d[i] = g_ntohs (d[i]);
+ }
+ break;
+
+ case 4:
+ {
+ guint32 *d = (guint32 *) data;
+
+ for (i = 0; i < count; i++)
+ d[i] = g_ntohl (d[i]);
+ }
+ break;
+
+ case 8:
+ {
+ guint64 *d = (guint64 *) data;
+
+ for (i = 0; i < count; i++)
+ d[i] = GINT64_FROM_BE (d[i]);
+ }
+ break;
+ }
+}