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201 lines
7.5 KiB
C
201 lines
7.5 KiB
C
/* GStreamer PNM utility functions
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* Copyright (C) 2009 Lutz Mueller <lutz@users.sourceforge.net>
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "gstpnmutils.h"
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GstPnmInfoMngrResult
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gst_pnm_info_mngr_scan (GstPnmInfoMngr * mngr, const guint8 * buf,
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guint buf_len)
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{
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guint i = 0;
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g_return_val_if_fail (mngr != NULL, GST_PNM_INFO_MNGR_RESULT_FAILED);
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g_return_val_if_fail (buf || !buf_len, GST_PNM_INFO_MNGR_RESULT_FAILED);
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if (!buf_len)
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return (mngr->info.fields ==
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GST_PNM_INFO_FIELDS_ALL) ? GST_PNM_INFO_MNGR_RESULT_FINISHED :
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GST_PNM_INFO_MNGR_RESULT_READING;
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switch (mngr->state) {
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case GST_PNM_INFO_MNGR_STATE_COMMENT:
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for (i = 0; (i < buf_len) && (buf[i] != '\n'); i++);
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if (i == buf_len)
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return GST_PNM_INFO_MNGR_RESULT_READING;
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mngr->state = GST_PNM_INFO_MNGR_STATE_NONE;
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mngr->data_offset += i;
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return gst_pnm_info_mngr_scan (mngr, buf + i, buf_len - i);
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case GST_PNM_INFO_MNGR_STATE_WHITE_SPACE:
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for (i = 0; (i < buf_len) && ((buf[i] == ' ') || (buf[i] == '\t')
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|| (buf[i] == '\n')); i++);
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if (i == buf_len)
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return GST_PNM_INFO_MNGR_RESULT_READING;
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mngr->state = GST_PNM_INFO_MNGR_STATE_NONE;
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mngr->data_offset += i;
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return gst_pnm_info_mngr_scan (mngr, buf + i, buf_len - i);
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case GST_PNM_INFO_MNGR_STATE_NONE:
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switch (buf[i++]) {
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case '#':
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mngr->state = GST_PNM_INFO_MNGR_STATE_COMMENT;
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mngr->data_offset += i;
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return gst_pnm_info_mngr_scan (mngr, buf + i, buf_len - i);
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case ' ':
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case '\t':
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case '\n':
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mngr->state = GST_PNM_INFO_MNGR_STATE_WHITE_SPACE;
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mngr->data_offset += i;
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return gst_pnm_info_mngr_scan (mngr, buf + i, buf_len - i);
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case 'P':
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if (mngr->info.fields & GST_PNM_INFO_FIELDS_TYPE)
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return GST_PNM_INFO_MNGR_RESULT_FAILED;
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mngr->state = GST_PNM_INFO_MNGR_STATE_DATA_TYPE;
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mngr->data_offset += i;
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return gst_pnm_info_mngr_scan (mngr, buf + i, buf_len - i);
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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if (mngr->info.fields & GST_PNM_INFO_FIELDS_MAX)
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return GST_PNM_INFO_MNGR_RESULT_FINISHED;
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if (mngr->info.fields & GST_PNM_INFO_FIELDS_HEIGHT) {
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mngr->state = GST_PNM_INFO_MNGR_STATE_DATA_MAX;
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return gst_pnm_info_mngr_scan (mngr, buf, buf_len);
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}
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if (mngr->info.fields & GST_PNM_INFO_FIELDS_WIDTH) {
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mngr->state = GST_PNM_INFO_MNGR_STATE_DATA_HEIGHT;
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return gst_pnm_info_mngr_scan (mngr, buf, buf_len);
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}
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mngr->state = GST_PNM_INFO_MNGR_STATE_DATA_WIDTH;
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return gst_pnm_info_mngr_scan (mngr, buf, buf_len);
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default:
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return GST_PNM_INFO_MNGR_RESULT_FAILED;
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}
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case GST_PNM_INFO_MNGR_STATE_DATA_TYPE:
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switch (buf[i++]) {
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case '1':
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mngr->info.type = GST_PNM_TYPE_BITMAP;
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mngr->info.encoding = GST_PNM_ENCODING_ASCII;
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break;
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case '2':
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mngr->info.type = GST_PNM_TYPE_GRAYMAP;
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mngr->info.encoding = GST_PNM_ENCODING_ASCII;
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break;
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case '3':
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mngr->info.type = GST_PNM_TYPE_PIXMAP;
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mngr->info.encoding = GST_PNM_ENCODING_ASCII;
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break;
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case '4':
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mngr->info.type = GST_PNM_TYPE_BITMAP;
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mngr->info.encoding = GST_PNM_ENCODING_RAW;
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break;
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case '5':
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mngr->info.type = GST_PNM_TYPE_GRAYMAP;
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mngr->info.encoding = GST_PNM_ENCODING_RAW;
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break;
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case '6':
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mngr->info.type = GST_PNM_TYPE_PIXMAP;
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mngr->info.encoding = GST_PNM_ENCODING_RAW;
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break;
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default:
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return GST_PNM_INFO_MNGR_RESULT_FAILED;
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}
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mngr->info.fields |=
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GST_PNM_INFO_FIELDS_TYPE | GST_PNM_INFO_FIELDS_ENCODING;
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mngr->state = GST_PNM_INFO_MNGR_STATE_WHITE_SPACE;
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if (i == buf_len)
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return GST_PNM_INFO_MNGR_RESULT_READING;
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mngr->info.width = mngr->info.height = mngr->info.max = 0;
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mngr->data_offset += i;
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return gst_pnm_info_mngr_scan (mngr, buf + i, buf_len - i);
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case GST_PNM_INFO_MNGR_STATE_DATA_WIDTH:
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if ((buf[i] < '0') || (buf[i] > '9')) {
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switch (buf[i]) {
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case '\n':
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case '\t':
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case ' ':
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mngr->info.fields |= GST_PNM_INFO_FIELDS_WIDTH;
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mngr->state = GST_PNM_INFO_MNGR_STATE_WHITE_SPACE;
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mngr->data_offset += i;
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return gst_pnm_info_mngr_scan (mngr, buf + i, buf_len - i);
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default:
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return GST_PNM_INFO_MNGR_RESULT_FAILED;
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}
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}
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mngr->info.width *= 10;
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mngr->info.width += buf[i++] - 0x030;
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mngr->data_offset += i;
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return gst_pnm_info_mngr_scan (mngr, buf + i, buf_len - i);
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case GST_PNM_INFO_MNGR_STATE_DATA_HEIGHT:
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if ((buf[i] < '0') || (buf[i] > '9')) {
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switch (buf[i]) {
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case '\n':
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case '\t':
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case ' ':
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mngr->info.fields |= GST_PNM_INFO_FIELDS_HEIGHT;
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mngr->state = GST_PNM_INFO_MNGR_STATE_WHITE_SPACE;
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mngr->data_offset += i;
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if (mngr->info.type == GST_PNM_TYPE_BITMAP) {
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mngr->data_offset += 1;
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mngr->info.fields |= GST_PNM_INFO_FIELDS_MAX;
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return GST_PNM_INFO_MNGR_RESULT_FINISHED;
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}
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return gst_pnm_info_mngr_scan (mngr, buf + i, buf_len - i);
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default:
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return GST_PNM_INFO_MNGR_RESULT_FAILED;
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}
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}
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mngr->info.height *= 10;
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mngr->info.height += buf[i++] - 0x030;
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mngr->data_offset += i;
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return gst_pnm_info_mngr_scan (mngr, buf + i, buf_len - i);
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case GST_PNM_INFO_MNGR_STATE_DATA_MAX:
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if ((buf[i] < '0') || (buf[i] > '9')) {
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switch (buf[i]) {
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case '\n':
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case '\t':
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case ' ':
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/* Check for maximum and minimum supported bit depth and
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return error if its out of range */
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if (mngr->info.type == GST_PNM_TYPE_GRAYMAP) {
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if ((mngr->info.max > 65535) || (mngr->info.max < 1)) {
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return GST_PNM_INFO_MNGR_RESULT_FAILED;
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}
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} else if ((mngr->info.max > 255) || (mngr->info.max < 1)) {
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return GST_PNM_INFO_MNGR_RESULT_FAILED;
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}
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mngr->info.fields |= GST_PNM_INFO_FIELDS_MAX;
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mngr->data_offset += i + 1;
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return GST_PNM_INFO_MNGR_RESULT_FINISHED;
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default:
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return GST_PNM_INFO_MNGR_RESULT_FAILED;
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}
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}
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mngr->info.max *= 10;
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mngr->info.max += buf[i++] - 0x030;
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mngr->data_offset += i;
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return gst_pnm_info_mngr_scan (mngr, buf + i, buf_len - i);
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}
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return GST_PNM_INFO_MNGR_RESULT_FAILED;
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}
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