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/******************************************************************************
* $Id: msg_reader_core.cpp 24910 2012-09-05 17:52:18Z rouault $
*
* Project: MSG Native Reader
* Purpose: Base class for reading in the headers of MSG native images
* Author: Frans van den Bergh, fvdbergh@csir.co.za
*
******************************************************************************
* Copyright (c) 2005, Frans van den Bergh <fvdbergh@csir.co.za>
*
* 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.
****************************************************************************/
#include "msg_reader_core.h"
#include "msg_basic_types.h"
#include <stdio.h>
#include <string.h>
#include <math.h>
#ifdef DEBUG
#ifdef GDAL_SUPPORT
#undef DEBUG
#endif
#endif
#ifdef GDAL_SUPPORT
#include "cpl_vsi.h"
CPL_CVSID("$Id: msg_reader_core.cpp 24910 2012-09-05 17:52:18Z rouault $");
#else
#define VSIFSeek(fp, pos, ref) fseek(fp, pos, ref)
#define VSIFRead(p, bs, nb, fp) fread(p, bs, nb, fp)
#endif
namespace msg_native_format {
const Blackbody_lut_type Msg_reader_core::Blackbody_LUT[MSG_NUM_CHANNELS+1] = {
{0,0,0}, // dummy channel
{0,0,0}, // N/A
{0,0,0}, // N/A
{0,0,0}, // N/A
{2569.094, 0.9959, 3.471},
{1598.566, 0.9963, 2.219},
{1362.142, 0.9991, 0.485},
{1149.083, 0.9996, 0.181},
{1034.345, 0.9999, 0.060},
{ 930.659, 0.9983, 0.627},
{ 839.661, 0.9988, 0.397},
{ 752.381, 0.9981, 0.576},
{0,0,0} // N/A
};
Msg_reader_core::Msg_reader_core(const char* fname) {
FILE* fin = fopen(fname, "rb");
if (!fin) {
fprintf(stderr, "Could not open file %s\n", fname);
return;
}
read_metadata_block(fin);
}
Msg_reader_core::Msg_reader_core(FILE* fp) {
read_metadata_block(fp);
}
void Msg_reader_core::read_metadata_block(FILE* fin) {
_open_success = true;
unsigned int i;
VSIFRead(&_main_header, sizeof(_main_header), 1, fin);
VSIFRead(&_sec_header, sizeof(_sec_header), 1, fin);
#ifdef DEBUG
// print out all the fields in the header
PH_DATA* hd = (PH_DATA*)&_main_header;
for (int i=0; i < 6; i++) {
to_string(*hd);
printf("[%02d] %s %s", i, hd->name, hd->value);
hd++;
}
PH_DATA_ID* hdi = (PH_DATA_ID*)&_main_header.dataSetIdentification;
for (i=0; i < 5; i++) {
printf("%s %s %s", hdi->name, hdi->size, hdi->address);
hdi++;
}
hd = (PH_DATA*)(&_main_header.totalFileSize);
for (int i=0; i < 19; i++) {
to_string(*hd);
printf("[%02d] %s %s", i, hd->name, hd->value);
hd++;
}
#endif // DEBUG
// extract data & header positions
for (i=0; i < 5; i++) {
PH_DATA_ID* hdi = (PH_DATA_ID*)&_main_header.dataSetIdentification[i];
if (strncmp(hdi->name, "15Header", strlen("15Header")) == 0) {
sscanf(hdi->size, "%d", &_f_header_size);
sscanf(hdi->address, "%d", &_f_header_offset);
} else
if (strncmp(hdi->name, "15Data", strlen("15Data")) == 0) {
sscanf(hdi->size, "%d", &_f_data_size);
sscanf(hdi->address, "%d", &_f_data_offset);
}
}
#ifdef DEBUG
printf("Data: %d %d\n", _f_data_offset, _f_data_size);
printf("Header: %d %d\n", _f_header_offset, _f_header_size);
#endif // DEBUG
unsigned int lines;
sscanf(_sec_header.northLineSelectedRectangle.value, "%d", &_lines);
sscanf(_sec_header.southLineSelectedRectangle.value, "%d", &lines);
_line_start = lines;
_lines -= lines - 1;
unsigned int cols;
sscanf(_sec_header.westColumnSelectedRectangle.value, "%d", &_columns);
sscanf(_sec_header.eastColumnSelectedRectangle.value, "%d", &cols);
_col_start = cols;
_columns -= cols - 1;
#ifdef DEBUG
printf("lines = %d, cols = %d\n", _lines, _columns);
#endif // DEBUG
int records_per_line = 0;
for (i=0; i < MSG_NUM_CHANNELS; i++) {
if (_sec_header.selectedBandIds.value[i] == 'X') {
_bands[i] = 1;
records_per_line += (i == (MSG_NUM_CHANNELS-1)) ? 3 : 1;
} else {
_bands[i] = 0;
}
}
#ifdef DEBUG
printf("reading a total of %d records per line\n", records_per_line);
#endif // DEBUG
// extract time fields, assume that SNIT is the correct field:
sscanf(_main_header.snit.value + 0, "%04d", &_year);
sscanf(_main_header.snit.value + 4, "%02d", &_month);
sscanf(_main_header.snit.value + 6, "%02d", &_day);
sscanf(_main_header.snit.value + 8, "%02d", &_hour);
sscanf(_main_header.snit.value + 10, "%02d", &_minute);
// read radiometric block
RADIOMETRIC_PROCCESSING_RECORD rad;
off_t offset = RADIOMETRICPROCESSING_RECORD_OFFSET + _f_header_offset + sizeof(GP_PK_HEADER) + sizeof(GP_PK_SH1) + 1;
VSIFSeek(fin, offset, SEEK_SET);
VSIFRead(&rad, sizeof(RADIOMETRIC_PROCCESSING_RECORD), 1, fin);
to_native(rad);
memcpy((void*)_calibration, (void*)&rad.level1_5ImageCalibration,sizeof(_calibration));
#ifdef DEBUG
for (unsigned int i=0; i < MSG_NUM_CHANNELS; i++) {
if (_calibration[i].cal_slope < 0 || _calibration[i].cal_slope > 0.4) {
printf("Warning: calibration slope (%f) out of nominal range. MSG reader probably broken\n", _calibration[i].cal_slope);
}
if (_calibration[i].cal_offset > 0 || _calibration[i].cal_offset < -20) {
printf("Warning: calibration offset (%f) out of nominal range. MSG reader probably broken\n", _calibration[i].cal_offset);
}
}
#endif
// read image description block
IMAGE_DESCRIPTION_RECORD idr;
offset = RADIOMETRICPROCESSING_RECORD_OFFSET - IMAGEDESCRIPTION_RECORD_LENGTH + _f_header_offset + sizeof(GP_PK_HEADER) + sizeof(GP_PK_SH1) + 1;
VSIFSeek(fin, offset, SEEK_SET);
VSIFRead(&idr, sizeof(IMAGE_DESCRIPTION_RECORD), 1, fin);
to_native(idr);
_line_dir_step = idr.referencegrid_visir.lineDirGridStep;
_col_dir_step = idr.referencegrid_visir.columnDirGridStep;
// Rather convoluted, but this code is required to compute the real data block sizes
// It does this by reading in the first line of every band, to get to the packet size field
GP_PK_HEADER gp_header;
GP_PK_SH1 sub_header;
SUB_VISIRLINE visir_line;
VSIFSeek(fin, _f_data_offset, SEEK_SET);
_hrv_packet_size = 0;
_interline_spacing = 0;
visir_line.channelId = 0;
int scanned_bands[MSG_NUM_CHANNELS];
int band_count = 0;
for (i=0; i < MSG_NUM_CHANNELS; i++) {
scanned_bands[i] = _bands[i];
band_count += _bands[i];
}
do {
VSIFRead(&gp_header, sizeof(GP_PK_HEADER), 1, fin);
VSIFRead(&sub_header, sizeof(GP_PK_SH1), 1, fin);
VSIFRead(&visir_line, sizeof(SUB_VISIRLINE), 1, fin);
to_native(visir_line);
to_native(gp_header);
// skip over the actual line data
VSIFSeek(fin,
gp_header.packetLength - (sizeof(GP_PK_SH1) + sizeof(SUB_VISIRLINE) - 1),
SEEK_CUR
);
if (visir_line.channelId == 0 || visir_line.channelId > MSG_NUM_CHANNELS) {
_open_success = false;
break;
}
if (scanned_bands[visir_line.channelId - 1]) {
scanned_bands[visir_line.channelId - 1] = 0;
band_count--;
if (visir_line.channelId != 12) { // not the HRV channel
_visir_bytes_per_line = gp_header.packetLength - (sizeof(GP_PK_SH1) + sizeof(SUB_VISIRLINE) - 1);
_visir_packet_size = gp_header.packetLength + sizeof(GP_PK_HEADER) + 1;
_interline_spacing += _visir_packet_size;
} else {
_hrv_bytes_per_line = gp_header.packetLength - (sizeof(GP_PK_SH1) + sizeof(SUB_VISIRLINE) - 1);
_hrv_packet_size = gp_header.packetLength + sizeof(GP_PK_HEADER) + 1;
_interline_spacing += 3*_hrv_packet_size;
VSIFSeek(fin, 2*gp_header.packetLength, SEEK_CUR );
}
}
} while (band_count > 0);
}
#ifndef GDAL_SUPPORT
int Msg_reader_core::_chan_to_idx(Msg_channel_names channel) {
unsigned int idx = 0;
while (idx < MSG_NUM_CHANNELS) {
if ( (1 << (idx+1)) == (int)channel ) {
return idx;
}
idx++;
}
return 0;
}
void Msg_reader_core::get_pixel_geo_coordinates(unsigned int line, unsigned int column, double& longitude, double& latitude) {
Conversions::convert_pixel_to_geo((unsigned int)(line + _line_start), (unsigned int)(column + _col_start), longitude, latitude);
}
void Msg_reader_core::get_pixel_geo_coordinates(double line, double column, double& longitude, double& latitude) {
Conversions::convert_pixel_to_geo(line + _line_start, column + _col_start, longitude, latitude);
}
double Msg_reader_core::compute_pixel_area_sqkm(double line, double column) {
return Conversions::compute_pixel_area_sqkm(line + _line_start, column + _col_start);
}
#endif // GDAL_SUPPORT
} // namespace msg_native_format
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