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/* asciitopgm.c - read an ASCII graphics file and produce a PGM
**
** Copyright (C) 1989 by Wilson H. Bent, Jr
**
** - Based on fstopgm.c and other works which bear the following notice:
** 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_c_util.h"
#include "mallocvar.h"
#include "nstring.h"
#include "pgm.h"
static unsigned int const gmap [128] = {
/*00 nul-bel*/ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/*08 bs -si */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/*10 dle-etb*/ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/*18 can-us */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/*20 sp - ' */ 0x00, 0x21, 0x1b, 0x7f, 0x70, 0x25, 0x20, 0x0a,
/*28 ( - / */ 0x11, 0x11, 0x2a, 0x2b, 0x0b, 0x13, 0x04, 0x10,
/*30 0 - 7 */ 0x30, 0x28, 0x32, 0x68, 0x39, 0x35, 0x39, 0x16,
/*38 8 - ? */ 0x38, 0x39, 0x14, 0x15, 0x11, 0x1c, 0x11, 0x3f,
/*40 @ - G */ 0x40, 0x49, 0x52, 0x18, 0x44, 0x3c, 0x38, 0x38,
/*48 H - O */ 0x55, 0x28, 0x2a, 0x70, 0x16, 0x7f, 0x70, 0x14,
/*50 P - W */ 0x60, 0x20, 0x62, 0x53, 0x1a, 0x55, 0x36, 0x57,
/*58 X - _ */ 0x50, 0x4c, 0x5a, 0x24, 0x10, 0x24, 0x5e, 0x13,
/*60 ` - g */ 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
/*68 h - o */ 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x2a,
/*70 p - w */ 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
/*78 x -del*/ 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
};
static gray const maxval = 127;
static void
zeroObuf(unsigned int * const obuf,
unsigned int const cols) {
unsigned int col;
for (col = 0; col < cols; ++col)
obuf[col] = 0;
}
static void
convertRowToPgm(const unsigned int * const obuf,
unsigned int const cols,
gray const maxval,
gray * const grayrow) {
unsigned int col;
for (col = 0; col < cols; ++col)
grayrow[col] = maxval - MIN(maxval, obuf[col]);
}
static bool warnedNonAscii;
static unsigned int
darknessOfChar(char const c) {
unsigned char asciifiedC;
if (c & 0x80) { /* !isascii(c) */
if (!warnedNonAscii) {
pm_message("Warning: non-ASCII char(s) in input");
warnedNonAscii = true;
}
asciifiedC = c & 0x7f; /* toascii(c) */
} else
asciifiedC = c;
return gmap[asciifiedC];
}
static void
convertAsciiToPgm(FILE * const ifP,
unsigned int const cols,
unsigned int const rows,
unsigned int const divisor,
gray const maxval,
gray ** const grays,
unsigned int * const obuf) {
unsigned int outRow;
unsigned int outCursor;
bool beginningOfImage;
bool beginningOfLine;
bool warnedTrunc;
bool eof;
zeroObuf(obuf, cols);
warnedNonAscii = false;
warnedTrunc = false;
outRow = 0;
outCursor = 0;
beginningOfImage = true;
beginningOfLine = true;
eof = false;
while (outRow < rows && !eof) {
int c;
c = getc(ifP);
if (c == EOF)
eof = true;
else {
if (beginningOfLine) {
if (c == '+') {
/* + at start of line means rest of line
overstrikes previous
*/
c = getc(ifP);
if (c == EOF)
eof = true;
} else {
if (!beginningOfImage) {
/* Output previous line, move to next */
convertRowToPgm(obuf, cols, maxval, grays[outRow]);
zeroObuf(obuf, cols);
++outRow;
}
}
outCursor = 0;
beginningOfLine = false;
}
if (!eof) {
if (c == '\n')
beginningOfLine = true;
else {
if (outRow < rows && outCursor < cols)
obuf[outCursor++] += darknessOfChar(c) / divisor;
else {
if (!warnedTrunc) {
pm_message("Warning: "
"truncating image to %u columns "
"x %u rows", cols, rows);
warnedTrunc = true;
}
}
}
}
}
beginningOfImage = false;
}
while (outRow < rows) {
/* Output previous line, move to next */
convertRowToPgm(obuf, cols, maxval, grays[outRow]);
zeroObuf(obuf, cols);
++outRow;
}
}
int
main(int argc, const char ** argv) {
FILE * ifP;
gray ** grays;
int argn;
unsigned int rows, cols;
unsigned int divisor;
unsigned int * obuf; /* malloced */
const char * const usage = "[-d <val>] height width [asciifile]";
pm_proginit(&argc, argv);
rows = 0; /* initial value */
cols = 0; /* initial value */
divisor = 1; /* initial value */
argn = 1;
if ( argc < 3 || argc > 6 )
pm_usage( usage );
if ( argv[argn][0] == '-' )
{
if ( streq( argv[argn], "-d" ) )
{
if ( argc == argn + 1 )
pm_usage( usage );
if ( sscanf( argv[argn+1], "%u", &divisor ) != 1 )
pm_usage( usage );
argn += 2;
}
else
pm_usage( usage );
}
if ( sscanf( argv[argn++], "%u", &rows ) != 1 )
pm_usage( usage );
if ( sscanf( argv[argn++], "%u", &cols ) != 1 )
pm_usage( usage );
if ( rows < 1 )
pm_error( "height is less than 1" );
if ( cols < 1 )
pm_error( "width is less than 1" );
if ( argc > argn + 1 )
pm_usage( usage );
if ( argc == argn + 1 )
ifP = pm_openr(argv[argn]);
else
ifP = stdin;
MALLOCARRAY(obuf, cols);
if (obuf == NULL)
pm_error("Unable to allocate memory for %u columns", cols);
grays = pgm_allocarray(cols, rows);
convertAsciiToPgm(ifP, cols, rows, divisor, maxval, grays, obuf);
pm_close(ifP);
pgm_writepgm(stdout, grays, cols, rows, maxval, 0);
free(obuf);
pgm_freearray(grays, rows);
return 0;
}
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