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