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/*=============================================================================
pgmtost4
===============================================================================
This program converts from PGM to a simple subset of SBIG ST-4.
By Bryan Henderson January 19, 2015.
Contributed to the public domain by its author.
=============================================================================*/
#include <string.h>
#include "pm.h"
#include "nstring.h"
#include "pam.h"
static unsigned int const st4Height = 165;
static unsigned int const st4Width = 192;
static unsigned int const st4Maxval = 255;
static void
writeSt4Footer(FILE * const ofP) {
const char * const comment = "This was created by Pgmtost4";
char buffer[192];
memset(buffer, ' ', sizeof(buffer)); /* initial value */
buffer[0] = 'v';
memcpy(&buffer[ 0], "v", 1);
memcpy(&buffer[ 1], comment, strlen(comment));
memcpy(&buffer[ 79], " 7", 10);
memcpy(&buffer[ 89], " 8", 10);
memcpy(&buffer[ 99], " 9", 10);
memcpy(&buffer[109], " 10", 10);
fwrite(buffer, 1, sizeof(buffer), ofP);
}
int
main(int argc, const char * argv[]) {
FILE * ifP;
tuple * tuplerow;
struct pam inpam;
unsigned int row;
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);
pnm_readpaminit(ifP, &inpam, PAM_STRUCT_SIZE(tuple_type));
if (inpam.height != st4Height)
pm_error("Image is wrong height for ST-4 SBIG: %u pixels. "
"Must be %u", inpam.height, st4Height);
if (inpam.width != st4Width)
pm_error("Image is wrong width for ST-4 SBIG: %u pixels. "
"Must be %u", inpam.width, st4Width);
/* Really, we should just scale to maxval 255. There are library routines
for that, but we're too lazy even for that, since nobody is really
going to use this program.
*/
if (inpam.maxval != st4Maxval)
pm_error("Image is wrong maxval for ST-4 SBIG: %u. "
"Must be %u", (unsigned)inpam.maxval, st4Maxval);
tuplerow = pnm_allocpamrow(&inpam);
for (row = 0; row < inpam.height; ++row) {
unsigned int col;
pnm_readpamrow(&inpam, tuplerow);
for (col = 0; col < inpam.width; ++col)
pm_writechar(stdout, (char)tuplerow[col][0]);
}
writeSt4Footer(stdout);
pm_close(ifP);
return 0;
}
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