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/*=============================================================================
pgmtosbig
===============================================================================
This program converts from PGM to a simple subset of SBIG.
By Bryan Henderson January 19, 2015.
Contributed to the public domain by its author.
=============================================================================*/
#include <string.h>
#include "pm.h"
#include "nstring.h"
#include "pgm.h"
#define SBIG_HEADER_LENGTH 2048 /* File header length */
#define CTLZ "\x1A"
struct SbigHeader {
/*----------------------------------------------------------------------------
The information in an SBIG file header.
This is only the information this program cares about; the header
may have much more information in it.
-----------------------------------------------------------------------------*/
unsigned int height;
unsigned int width;
unsigned int saturationLevel;
};
static void
addUintParm(char * const buffer,
const char * const name,
unsigned int const value) {
const char * line;
pm_asprintf(&line, "%s=%u\n\r", name, value);
strcat(buffer, line);
pm_strfree(line);
}
static void
writeSbigHeader(FILE * const ofP,
struct SbigHeader const hdr) {
char buffer[SBIG_HEADER_LENGTH];
memset(&buffer[0], 0x00, sizeof(buffer));
buffer[0] = '\0';
/* N.B. LF-CR instead of CRLF. That's what the spec says. */
strcat(buffer, "ST-6 Image\n\r" );
addUintParm(buffer, "Height", hdr.height);
addUintParm(buffer, "Width", hdr.width);
addUintParm(buffer, "Sat_level", hdr.saturationLevel);
strcat(buffer, "End\n\r" CTLZ);
fwrite(buffer, 1, sizeof(buffer), ofP);
}
int
main(int argc, const char * argv[]) {
FILE * ifP;
gray * grayrow;
int rows;
int cols;
int format;
struct SbigHeader hdr;
unsigned int row;
gray maxval;
const char * inputFile;
pm_proginit(&argc, argv);
if (argc-1 < 1)
inputFile = "-";
else {
inputFile = argv[1];
if (argc-1 > 2)
pm_error("Too many arguments. The only argument is the optional "
"input file name");
}
ifP = pm_openr(inputFile);
pgm_readpgminit(ifP, &cols, &rows, &maxval, &format);
grayrow = pgm_allocrow(cols);
hdr.height = rows;
hdr.width = cols;
hdr.saturationLevel = maxval;
writeSbigHeader(stdout, hdr);
for (row = 0; row < rows; ++row) {
unsigned int col;
pgm_readpgmrow(ifP, grayrow, cols, maxval, format);
for (col = 0; col < cols; ++col)
pm_writelittleshort(stdout, grayrow[col]);
}
pm_close(ifP);
return 0;
}
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