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/* fstopgm.c - read a Usenix FaceSaver(tm) file and produce a portable graymap
**
** Copyright (C) 1989 by Jef Poskanzer.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation. This software is provided "as is" without express or
** implied warranty.
*/
#include <string.h>
#include "pm.h"
#include "pgm.h"
static int
gethexit(FILE * const ifP) {
for ( ; ; ) {
unsigned int const i = getc(ifP);
if (i == EOF)
pm_error("EOF / read error");
else {
char const c = (char) i;
if (c >= '0' && c <= '9')
return c - '0';
else if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
else if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
else {
/* Ignore - whitespace. */
}
}
}
}
static void
warnNonsquarePixels(unsigned int const cols,
unsigned int const xcols,
unsigned int const rows,
unsigned int const xrows) {
const char * const baseMsg = "warning, non-square pixels";
if (pm_have_float_format()) {
float const rowratio = (float) xrows / (float) rows;
float const colratio = (float) xcols / (float) cols;
pm_message("%s; to fix do a 'pamscale -%cscale %g'",
baseMsg,
rowratio > colratio ? 'y' : 'x',
rowratio > colratio ?
rowratio / colratio : colratio / rowratio);
} else
pm_message("%s", baseMsg);
}
int
main(int argc, const char ** argv) {
FILE * ifP;
gray ** grays;
int argn;
int row;
gray maxval;
int rows, cols, depth;
int xrows, xcols, xdepth;
#define STRSIZE 1000
pm_proginit(&argc, argv);
rows = 0;
cols = 0;
depth = 0;
xrows = 0;
xcols = 0;
xdepth = 0;
argn = 1;
if (argn < argc) {
ifP = pm_openr(argv[argn]);
argn++;
} else
ifP = stdin;
if (argn != argc)
pm_error("Too many arguments. The only argument is the file name");
/* Read the FaceSaver(tm) header. */
for ( ; ; ) {
char buf[STRSIZE];
char firstname[STRSIZE];
char lastname[STRSIZE];
char email[STRSIZE];
char * const rc = fgets(buf, STRSIZE, ifP);
if (rc == NULL)
pm_error("error reading header");
/* Blank line ends header. */
if (strlen(buf) == 1)
break;
if (sscanf(buf, "FirstName: %[^\n]", firstname) == 1);
else if (sscanf(buf, "LastName: %[^\n]", lastname) == 1);
else if (sscanf(buf, "E-mail: %[^\n]", email ) == 1);
else if (sscanf(buf, "PicData: %d %d %d\n",
&cols, &rows, &depth ) == 3) {
if (depth != 8)
pm_error("can't handle 'PicData' depth other than 8");
} else if (sscanf(buf, "Image: %d %d %d\n",
&xcols, &xrows, &xdepth ) == 3) {
if (xdepth != 8)
pm_error("can't handle 'Image' depth other than 8");
}
}
if (cols <= 0 || rows <= 0)
pm_error("invalid header");
maxval = pm_bitstomaxval(depth);
if (maxval > PGM_OVERALLMAXVAL)
pm_error("depth %d is too large. Our maximum is %d",
maxval, PGM_OVERALLMAXVAL);
if (xcols != 0 && xrows != 0 && (xcols != cols || xrows != rows))
warnNonsquarePixels(cols, xcols, rows, xrows);
/* Read the hex bits. */
grays = pgm_allocarray(cols, rows);
for (row = rows - 1; row >= 0; --row) {
unsigned int col;
for (col = 0; col < cols; ++col) {
grays[row][col] = gethexit(ifP) << 4;
grays[row][col] += gethexit(ifP);
}
}
pm_close(ifP);
pgm_writepgm(stdout, grays, cols, rows, maxval, 0);
pm_close(stdout);
return 0;
}
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