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-rw-r--r--ext/metadata/metadataparsejpeg.c374
1 files changed, 374 insertions, 0 deletions
diff --git a/ext/metadata/metadataparsejpeg.c b/ext/metadata/metadataparsejpeg.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 "metadataparsejpeg.h"
+
+#include <string.h>
+
+#include <libiptcdata/iptc-jpeg.h>
+
+static int
+metadataparse_jpeg_reading (JpegData * jpeg_data, guint8 ** buf,
+ guint32 * bufsize, guint8 ** next_start, guint32 * next_size);
+
+
+static int
+metadataparse_jpeg_hold_chunk (JpegData * jpeg_data, guint8 ** buf,
+ guint32 * bufsize, guint8 ** next_start,
+ guint32 * next_size, GstAdapter ** adapter);
+
+static int
+metadataparse_jpeg_exif (JpegData * jpeg_data, guint8 ** buf,
+ guint32 * bufsize, guint8 ** next_start, guint32 * next_size);
+
+static int
+metadataparse_jpeg_iptc (JpegData * jpeg_data, guint8 ** buf,
+ guint32 * bufsize, guint8 ** next_start, guint32 * next_size);
+
+static int
+metadataparse_jpeg_jump (JpegData * jpeg_data, guint8 ** buf,
+ guint32 * bufsize, guint8 ** next_start, guint32 * next_size);
+
+#define READ(buf, size) ( (size)--, *((buf)++) )
+
+void
+metadataparse_jpeg_init (JpegData * jpeg_data, GstAdapter ** adpt_exif,
+ GstAdapter ** adpt_iptc, GstAdapter ** adpt_xmp)
+{
+ jpeg_data->state = JPEG_NULL;
+ jpeg_data->adpt_exif = adpt_exif;
+ jpeg_data->adpt_iptc = adpt_iptc;
+ jpeg_data->adpt_xmp = adpt_xmp;
+ jpeg_data->read = 0;
+}
+
+void
+metadataparse_jpeg_dispose (JpegData * jpeg_data)
+{
+
+ jpeg_data->adpt_exif = NULL;
+ jpeg_data->adpt_iptc = NULL;
+ jpeg_data->adpt_xmp = NULL;
+}
+
+int
+metadataparse_jpeg_parse (JpegData * jpeg_data, guint8 * buf,
+ guint32 * bufsize, guint8 ** next_start, guint32 * next_size)
+{
+
+ int ret = 0;
+ guint8 mark[2] = { 0x00, 0x00 };
+
+ *next_start = buf;
+
+ if (jpeg_data->state == JPEG_NULL) {
+
+ if (*bufsize < 2) {
+ *next_size = (buf - *next_start) + 2;
+ ret = 1;
+ goto done;
+ }
+
+ mark[0] = READ (buf, *bufsize);
+ mark[1] = READ (buf, *bufsize);
+
+ if (mark[0] != 0xFF || mark[1] != 0xD8) {
+ ret = -1;
+ goto done;
+ }
+
+ jpeg_data->state = JPEG_READING;
+
+ }
+
+ while (ret == 0) {
+ switch (jpeg_data->state) {
+ case JPEG_READING:
+ ret =
+ metadataparse_jpeg_reading (jpeg_data, &buf, bufsize, next_start,
+ next_size);
+ break;
+ case JPEG_JUMPING:
+ ret =
+ metadataparse_jpeg_jump (jpeg_data, &buf, bufsize, next_start,
+ next_size);
+ break;
+ case JPEG_EXIF:
+ ret =
+ metadataparse_jpeg_exif (jpeg_data, &buf, bufsize, next_start,
+ next_size);
+ break;
+ case JPEG_IPTC:
+ ret =
+ metadataparse_jpeg_iptc (jpeg_data, &buf, bufsize, next_start,
+ next_size);
+ break;
+ case JPEG_DONE:
+ goto done;
+ break;
+ default:
+ ret = -1;
+ break;
+ }
+ }
+
+done:
+
+ return ret;
+
+}
+
+
+/* look for markers */
+static int
+metadataparse_jpeg_reading (JpegData * jpeg_data, guint8 ** buf,
+ guint32 * bufsize, guint8 ** next_start, guint32 * next_size)
+{
+
+ int ret = -1;
+ guint8 mark[2] = { 0x00, 0x00 };
+ guint16 chunk_size = 0;
+
+ static const unsigned char ExifHeader[] =
+ { 0x45, 0x78, 0x69, 0x66, 0x00, 0x00 };
+ static const char IptcHeader[] = "Photoshop 3.0";
+
+ *next_start = *buf;
+
+ if (*bufsize < 2) {
+ *next_size = (*buf - *next_start) + 2;
+ ret = 1;
+ goto done;
+ }
+
+ mark[0] = READ (*buf, *bufsize);
+ mark[1] = READ (*buf, *bufsize);
+
+ if (mark[0] == 0xFF) {
+ if (mark[1] == 0xD9) { /* end of image */
+ ret = 0;
+ jpeg_data->state = JPEG_DONE;
+ goto done;
+ } else if (mark[1] == 0xDA) { /* start of scan, lets not look behinf of this */
+ ret = 0;
+ jpeg_data->state = JPEG_DONE;
+ goto done;
+ }
+
+ if (*bufsize < 2) {
+ *next_size = (*buf - *next_start) + 2;
+ ret = 1;
+ goto done;
+ }
+
+ chunk_size = READ (*buf, *bufsize) << 8;
+ chunk_size += READ (*buf, *bufsize);
+
+ if (mark[1] == 0xE1) { /* may be it is Exif */
+ if (chunk_size >= 8) { /* size2 'EXIF' 0x00 0x00 */
+ guint8 ch;
+
+ if (*bufsize < 6) {
+ *next_size = (*buf - *next_start) + 6;
+ ret = 1;
+ goto done;
+ }
+
+ if (jpeg_data->adpt_exif) {
+ if (0 == memcmp (ExifHeader, *buf, 6)) {
+ jpeg_data->read = chunk_size - 2;
+ ret = 0;
+ jpeg_data->state = JPEG_EXIF;
+ goto done;
+ }
+ }
+ }
+ } else if (mark[1] == 0xED) { /* may be it is photoshop and may be there is iptc */
+ if (chunk_size >= 16) { /* size2 "Photoshop 3.0" */
+
+ if (*bufsize < 14) {
+ *next_size = (*buf - *next_start) + 14;
+ ret = 1;
+ goto done;
+ }
+
+ if (jpeg_data->adpt_iptc) {
+ if (0 == memcmp (IptcHeader, *buf, 14)) {
+ jpeg_data->read = chunk_size - 2;
+ ret = 0;
+ jpeg_data->state = JPEG_IPTC;
+ goto done;
+ }
+ }
+ }
+ }
+
+ /* just set jump sise */
+ jpeg_data->read = chunk_size - 2;
+ jpeg_data->state = JPEG_JUMPING;
+ ret = 0;
+
+ } else {
+ /* invalid JPEG chunk */
+ ret = -1;
+ }
+
+
+done:
+
+ return ret;
+
+
+}
+
+static int
+metadataparse_jpeg_hold_chunk (JpegData * jpeg_data, guint8 ** buf,
+ guint32 * bufsize, guint8 ** next_start,
+ guint32 * next_size, GstAdapter ** adapter)
+{
+ int ret;
+
+ if (jpeg_data->read > *bufsize) {
+ *next_start = *buf;
+ *next_size = jpeg_data->read;
+ ret = 1;
+ } else {
+ GstBuffer *gst_buf;
+
+ if (NULL == *adapter) {
+ *adapter = gst_adapter_new ();
+ }
+ gst_buf = gst_buffer_new_and_alloc (jpeg_data->read);
+ memcpy (GST_BUFFER_DATA (gst_buf), *buf, jpeg_data->read);
+ gst_adapter_push (*adapter, gst_buf);
+
+ *next_start = *buf + jpeg_data->read;
+ *buf += jpeg_data->read;
+ *bufsize -= jpeg_data->read;
+ jpeg_data->state = JPEG_READING;
+ ret = 0;
+ }
+
+ return ret;
+}
+
+static int
+metadataparse_jpeg_exif (JpegData * jpeg_data, guint8 ** buf,
+ guint32 * bufsize, guint8 ** next_start, guint32 * next_size)
+{
+
+ return metadataparse_jpeg_hold_chunk (jpeg_data, buf,
+ bufsize, next_start, next_size, jpeg_data->adpt_exif);
+
+}
+
+static int
+metadataparse_jpeg_iptc (JpegData * jpeg_data, guint8 ** buf,
+ guint32 * bufsize, guint8 ** next_start, guint32 * next_size)
+{
+
+ int ret;
+
+ ret = metadataparse_jpeg_hold_chunk (jpeg_data, buf,
+ bufsize, next_start, next_size, jpeg_data->adpt_iptc);
+
+
+ if (ret == 0) {
+
+ const guint8 *buf;
+ guint32 size;
+ unsigned int iptc_len;
+ int res;
+
+ size = gst_adapter_available (*jpeg_data->adpt_iptc);
+ buf = gst_adapter_peek (*jpeg_data->adpt_iptc, size);
+
+ res = iptc_jpeg_ps3_find_iptc (buf, size, &iptc_len);
+
+ if (res < 0) {
+ /* error */
+ ret = -1;
+ } else if (res == 0) {
+ /* no iptc data found */
+ gst_adapter_clear (*jpeg_data->adpt_iptc);
+ } else {
+ gst_adapter_flush (*jpeg_data->adpt_iptc, res);
+ size = gst_adapter_available (*jpeg_data->adpt_iptc);
+ if (size > iptc_len) {
+ GstBuffer *buf;
+
+ buf = gst_adapter_take_buffer (*jpeg_data->adpt_iptc, iptc_len);
+ gst_adapter_clear (*jpeg_data->adpt_iptc);
+ gst_adapter_push (*jpeg_data->adpt_iptc, buf);
+ }
+ }
+
+ }
+
+ return ret;
+
+}
+
+static int
+metadataparse_jpeg_jump (JpegData * jpeg_data, guint8 ** buf,
+ guint32 * bufsize, guint8 ** next_start, guint32 * next_size)
+{
+ int ret;
+
+ if (jpeg_data->read > *bufsize) {
+ jpeg_data->read -= *bufsize;
+ *next_size = 2;
+ *next_start = *buf + *bufsize + jpeg_data->read;
+ jpeg_data->read = 0;
+ *bufsize = 0;
+ jpeg_data->state = JPEG_READING;
+ ret = 1;
+ } else {
+ *next_start = *buf + jpeg_data->read;
+ *buf += jpeg_data->read;
+ *bufsize -= jpeg_data->read;
+ jpeg_data->state = JPEG_READING;
+ ret = 0;
+ }
+ return ret;
+}
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