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253 lines
7.2 KiB
C
253 lines
7.2 KiB
C
/*
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* GStreamer
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* Copyright 2007 Edgard Lima <edgard.lima@indt.org.br>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Alternatively, the contents of this file may be used under the
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* GNU Lesser General Public License Version 2.1 (the "LGPL"), in
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* which case the following provisions apply instead of the ones
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* mentioned above:
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "metadataparsepng.h"
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#include <string.h>
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static int
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metadataparse_png_reading (PngData * png_data, guint8 ** buf,
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guint32 * bufsize, const guint32 offset, const guint8 * step_buf,
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guint8 ** next_start, guint32 * next_size);
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static int
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metadataparse_png_xmp (PngData * png_data, guint8 ** buf,
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guint32 * bufsize, guint8 ** next_start, guint32 * next_size);
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static int
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metadataparse_png_jump (PngData * png_data, guint8 ** buf,
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guint32 * bufsize, guint8 ** next_start, guint32 * next_size);
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#define READ(buf, size) ( (size)--, *((buf)++) )
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void
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metadataparse_png_init (PngData * png_data, MetadataChunk * exif,
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MetadataChunk * iptc, MetadataChunk * xmp)
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{
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png_data->state = PNG_NULL;
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png_data->xmp = xmp;
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png_data->read = 0;
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metadataparse_xmp_init ();
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}
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void
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metadataparse_png_dispose (PngData * png_data)
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{
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metadataparse_xmp_dispose ();
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png_data->xmp = NULL;
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}
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int
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metadataparse_png_parse (PngData * png_data, guint8 * buf,
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guint32 * bufsize, const guint32 offset, guint8 ** next_start,
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guint32 * next_size)
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{
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int ret = 0;
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guint8 mark[8];
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const guint8 *step_buf = buf;
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*next_start = buf;
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if (png_data->state == PNG_NULL) {
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if (*bufsize < 8) {
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*next_size = (buf - *next_start) + 8;
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ret = 1;
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goto done;
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}
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mark[0] = READ (buf, *bufsize);
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mark[1] = READ (buf, *bufsize);
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mark[2] = READ (buf, *bufsize);
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mark[3] = READ (buf, *bufsize);
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mark[4] = READ (buf, *bufsize);
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mark[5] = READ (buf, *bufsize);
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mark[6] = READ (buf, *bufsize);
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mark[7] = READ (buf, *bufsize);
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if (mark[0] != 0x89 || mark[1] != 0x50 || mark[2] != 0x4E || mark[3] != 0x47
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|| mark[4] != 0x0D || mark[5] != 0x0A || mark[6] != 0x1A
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|| mark[7] != 0x0A) {
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ret = -1;
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goto done;
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}
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png_data->state = PNG_READING;
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}
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while (ret == 0) {
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switch (png_data->state) {
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case PNG_READING:
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ret =
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metadataparse_png_reading (png_data, &buf, bufsize,
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offset, step_buf, next_start, next_size);
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break;
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case PNG_JUMPING:
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ret =
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metadataparse_png_jump (png_data, &buf, bufsize, next_start,
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next_size);
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break;
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case PNG_XMP:
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ret =
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metadataparse_png_xmp (png_data, &buf, bufsize, next_start,
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next_size);
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break;
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case PNG_DONE:
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goto done;
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break;
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default:
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ret = -1;
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break;
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}
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}
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done:
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return ret;
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}
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/* look for markers */
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static int
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metadataparse_png_reading (PngData * png_data, guint8 ** buf,
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guint32 * bufsize, const guint32 offset, const guint8 * step_buf,
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guint8 ** next_start, guint32 * next_size)
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{
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int ret = -1;
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guint8 mark[4];
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guint32 chunk_size = 0;
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static const char XmpHeader[] = "XML:com.adobe.xmp";
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*next_start = *buf;
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if (*bufsize < 8) {
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*next_size = (*buf - *next_start) + 8;
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ret = 1;
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goto done;
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}
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chunk_size = READ (*buf, *bufsize) << 24;
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chunk_size += READ (*buf, *bufsize) << 16;
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chunk_size += READ (*buf, *bufsize) << 8;
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chunk_size += READ (*buf, *bufsize);
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mark[0] = READ (*buf, *bufsize);
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mark[1] = READ (*buf, *bufsize);
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mark[2] = READ (*buf, *bufsize);
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mark[3] = READ (*buf, *bufsize);
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if (mark[0] == 'I' && mark[1] == 'E' && mark[2] == 'N' && mark[3] == 'D') {
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ret = 0;
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png_data->state = PNG_DONE;
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goto done;
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}
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if (mark[0] == 'i' && mark[1] == 'T' && mark[2] == 'X' && mark[3] == 't') {
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if (chunk_size >= 22) { /* "XML:com.adobe.xmp" plus some flags */
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if (*bufsize < 22) {
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*next_size = (*buf - *next_start) + 22;
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ret = 1;
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goto done;
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}
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if (png_data->xmp) {
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if (0 == memcmp (XmpHeader, *buf, 18)) {
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png_data->xmp->offset = (*buf - step_buf) + offset - 8; /* maker + size */
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png_data->xmp->size = chunk_size + 12; /* chunk size plus app marker plus crc */
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*buf += 22; /* jump "XML:com.adobe.xmp" plus some flags */
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*bufsize -= 22;
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png_data->read = chunk_size - 22; /* four CRC bytes at the end will be jumped after */
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png_data->state = PNG_XMP;
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ret = 0;
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goto done;
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}
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}
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}
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}
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/* just set jump sise */
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png_data->read = chunk_size + 4; /* four CRC bytes at the end */
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png_data->state = PNG_JUMPING;
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ret = 0;
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done:
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return ret;
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}
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static int
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metadataparse_png_jump (PngData * png_data, guint8 ** buf,
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guint32 * bufsize, guint8 ** next_start, guint32 * next_size)
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{
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png_data->state = PNG_READING;
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return metadataparse_util_jump_chunk (&png_data->read, buf,
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bufsize, next_start, next_size);
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}
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static int
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metadataparse_png_xmp (PngData * png_data, guint8 ** buf,
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guint32 * bufsize, guint8 ** next_start, guint32 * next_size)
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{
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int ret;
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ret = metadataparse_util_hold_chunk (&png_data->read, buf,
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bufsize, next_start, next_size, &png_data->xmp->adapter);
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if (ret == 0) {
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/* jump four CRC bytes at the end of chunk */
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png_data->read = 4;
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png_data->state = PNG_JUMPING;
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/* if there is a second XMP chunk in the file it will be jumped */
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png_data->xmp = NULL;
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}
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return ret;
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}
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