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-rw-r--r--ext/metadata/metadatamuxpng.c273
1 files changed, 273 insertions, 0 deletions
diff --git a/ext/metadata/metadatamuxpng.c b/ext/metadata/metadatamuxpng.c
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+++ b/ext/metadata/metadatamuxpng.c
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+/*
+ * GStreamer
+ * Copyright 2007 Edgard Lima <edgard.lima@indt.org.br>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Alternatively, the contents of this file may be used under the
+ * GNU Lesser General Public License Version 2.1 (the "LGPL"), in
+ * which case the following provisions apply instead of the ones
+ * mentioned above:
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library 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 "metadatamuxpng.h"
+
+#include <string.h>
+
+static int
+metadatamux_png_reading (PngMuxData * png_data, guint8 ** buf,
+ guint32 * bufsize, const guint32 offset, const guint8 * step_buf,
+ guint8 ** next_start, guint32 * next_size);
+
+static int
+metadatamux_png_xmp (PngMuxData * png_data, guint8 ** buf,
+ guint32 * bufsize, guint8 ** next_start, guint32 * next_size);
+
+static int
+metadatamux_png_jump (PngMuxData * png_data, guint8 ** buf,
+ guint32 * bufsize, guint8 ** next_start, guint32 * next_size);
+
+#define READ(buf, size) ( (size)--, *((buf)++) )
+
+void
+metadatamux_png_lazy_update (PngMuxData * jpeg_data)
+{
+ /* nothing to do */
+}
+
+void
+metadatamux_png_init (PngMuxData * png_data, GstAdapter ** exif_adpt,
+ GstAdapter ** iptc_adpt, GstAdapter ** xmp_adpt,
+ MetadataChunkArray * strip_chunks, MetadataChunkArray * inject_chunks)
+{
+ png_data->state = PNG_MUX_NULL;
+ png_data->xmp_adapter = xmp_adpt;
+ png_data->read = 0;
+
+ png_data->strip_chunks = strip_chunks;
+ png_data->inject_chunks = inject_chunks;
+
+ metadataparse_xmp_init ();
+}
+
+void
+metadatamux_png_dispose (PngMuxData * png_data)
+{
+ metadataparse_xmp_dispose ();
+
+ png_data->xmp_adapter = NULL;
+}
+
+int
+metadatamux_png_parse (PngMuxData * png_data, guint8 * buf,
+ guint32 * bufsize, const guint32 offset, guint8 ** next_start,
+ guint32 * next_size)
+{
+
+ int ret = 0;
+ guint8 mark[8];
+ const guint8 *step_buf = buf;
+
+ *next_start = buf;
+
+ if (png_data->state == PNG_MUX_NULL) {
+
+ if (*bufsize < 8) {
+ *next_size = (buf - *next_start) + 8;
+ ret = 1;
+ goto done;
+ }
+
+ mark[0] = READ (buf, *bufsize);
+ mark[1] = READ (buf, *bufsize);
+ mark[2] = READ (buf, *bufsize);
+ mark[3] = READ (buf, *bufsize);
+ mark[4] = READ (buf, *bufsize);
+ mark[5] = READ (buf, *bufsize);
+ mark[6] = READ (buf, *bufsize);
+ mark[7] = READ (buf, *bufsize);
+
+ if (mark[0] != 0x89 || mark[1] != 0x50 || mark[2] != 0x4E || mark[3] != 0x47
+ || mark[4] != 0x0D || mark[5] != 0x0A || mark[6] != 0x1A
+ || mark[7] != 0x0A) {
+ ret = -1;
+ goto done;
+ }
+
+ png_data->state = PNG_MUX_READING;
+
+ }
+
+ /* JUST UNTIL NOT IMPLEMENTED */
+ return 0;
+
+ while (ret == 0) {
+ switch (png_data->state) {
+ case PNG_MUX_READING:
+ ret =
+ metadatamux_png_reading (png_data, &buf, bufsize,
+ offset, step_buf, next_start, next_size);
+ break;
+ case PNG_MUX_JUMPING:
+ ret =
+ metadatamux_png_jump (png_data, &buf, bufsize, next_start,
+ next_size);
+ break;
+ case PNG_MUX_XMP:
+ ret =
+ metadatamux_png_xmp (png_data, &buf, bufsize, next_start,
+ next_size);
+ break;
+ case PNG_MUX_DONE:
+ goto done;
+ break;
+ default:
+ ret = -1;
+ break;
+ }
+ }
+
+done:
+
+ return ret;
+
+}
+
+
+/* look for markers */
+static int
+metadatamux_png_reading (PngMuxData * png_data, guint8 ** buf,
+ guint32 * bufsize, const guint32 offset, const guint8 * step_buf,
+ guint8 ** next_start, guint32 * next_size)
+{
+
+ int ret = -1;
+ guint8 mark[4];
+ guint32 chunk_size = 0;
+
+ static const char XmpHeader[] = "XML:com.adobe.xmp";
+
+ *next_start = *buf;
+
+ if (*bufsize < 8) {
+ *next_size = (*buf - *next_start) + 8;
+ ret = 1;
+ goto done;
+ }
+
+ chunk_size = READ (*buf, *bufsize) << 24;
+ chunk_size += READ (*buf, *bufsize) << 16;
+ chunk_size += READ (*buf, *bufsize) << 8;
+ chunk_size += READ (*buf, *bufsize);
+
+ mark[0] = READ (*buf, *bufsize);
+ mark[1] = READ (*buf, *bufsize);
+ mark[2] = READ (*buf, *bufsize);
+ mark[3] = READ (*buf, *bufsize);
+
+ if (mark[0] == 'I' && mark[1] == 'E' && mark[2] == 'N' && mark[3] == 'D') {
+ ret = 0;
+ png_data->state = PNG_MUX_DONE;
+ goto done;
+ }
+
+ if (mark[0] == 'i' && mark[1] == 'T' && mark[2] == 'X' && mark[3] == 't') {
+ if (chunk_size >= 22) { /* "XML:com.adobe.xmp" plus some flags */
+ if (*bufsize < 22) {
+ *next_size = (*buf - *next_start) + 22;
+ ret = 1;
+ goto done;
+ }
+
+ if (0 == memcmp (XmpHeader, *buf, 18)) {
+ MetadataChunk chunk;
+
+ memset (&chunk, 0x00, sizeof (MetadataChunk));
+ chunk.offset_orig = (*buf - step_buf) + offset - 8; /* maker + size */
+ chunk.size = chunk_size + 12; /* chunk size plus app marker plus crc */
+
+ metadata_chunk_array_append_sorted (png_data->strip_chunks, &chunk);
+
+ /* if adapter has been provided, prepare to hold chunk */
+ if (png_data->xmp_adapter) {
+ *buf += 22; /* jump "XML:com.adobe.xmp" plus some flags */
+ *bufsize -= 22;
+ png_data->read = chunk_size - 22; /* four CRC bytes at the end will be jumped after */
+ png_data->state = PNG_MUX_XMP;
+ ret = 0;
+ goto done;
+ }
+ }
+ }
+ }
+
+ /* just set jump sise */
+ png_data->read = chunk_size + 4; /* four CRC bytes at the end */
+ png_data->state = PNG_MUX_JUMPING;
+ ret = 0;
+
+done:
+
+ return ret;
+
+
+}
+
+static int
+metadatamux_png_jump (PngMuxData * png_data, guint8 ** buf,
+ guint32 * bufsize, guint8 ** next_start, guint32 * next_size)
+{
+ png_data->state = PNG_MUX_READING;
+ return metadataparse_util_jump_chunk (&png_data->read, buf,
+ bufsize, next_start, next_size);
+}
+
+static int
+metadatamux_png_xmp (PngMuxData * png_data, guint8 ** buf,
+ guint32 * bufsize, guint8 ** next_start, guint32 * next_size)
+{
+ int ret;
+
+ ret = metadataparse_util_hold_chunk (&png_data->read, buf,
+ bufsize, next_start, next_size, png_data->xmp_adapter);
+ if (ret == 0) {
+ /* jump four CRC bytes at the end of chunk */
+ png_data->read = 4;
+ png_data->state = PNG_MUX_JUMPING;
+ /* if there is a second XMP chunk in the file it will be jumped */
+ png_data->xmp_adapter = NULL;
+ }
+ return ret;
+
+}
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