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/* asciitopgm.c - read an ASCII graphics file and produce a portable graymap
**
** 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 "pgm.h"
#include "mallocvar.h"
#include "nstring.h"
static char 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 maxval = 127;
int
main( argc, argv )
int argc;
char *argv[];
{
FILE *ifd;
register gray **grays;
int argn, row;
register int c, i;
int rows = 0, cols = 0;
int divisor = 1;
bool warned;
int *obuf;
const char * const usage = "[-d <val>] height width [asciifile]";
char trunc;
pgm_init( &argc, argv );
warned = FALSE;
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], "%d", &divisor ) != 1 )
pm_usage( usage );
argn += 2;
}
else
pm_usage( usage );
}
if ( sscanf( argv[argn++], "%d", &rows ) != 1 )
pm_usage( usage );
if ( sscanf( argv[argn++], "%d", &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 )
ifd = pm_openr( argv[argn] );
else
ifd = stdin;
/* Here's where the work is done:
* - Usually, the graymap value of the input char is summed into grays
* - For a 'normal' newline, the current row is adjusted by the divisor
* and the current row is incremented
* - If the first char in the input line is a '+', then the current row
* stays the same to allow 'overstriking'
* NOTE that we assume the user specified a sufficiently large width!
*/
MALLOCARRAY( obuf, cols );
if ( obuf == NULL )
pm_error( "Unable to allocate memory for %d columns.", cols);
else {
unsigned int col;
for (col = 0; col < cols; ++col) obuf[col] = 0;
}
grays = pgm_allocarray( cols, rows );
row = i = trunc = 0;
while ( row < rows )
{
switch (c = getc (ifd))
{
case EOF:
goto line_done;
case '\n':
newline:
trunc = 0;
if ((c = getc (ifd)) == EOF)
goto line_done;
if (c == '+')
i = 0;
else
{
line_done:
for (i = 0; i < cols; ++i)
grays[row][i] = maxval - (obuf[i] / divisor);
{
unsigned int col;
for (col = 0; col < cols; ++col) obuf[col] = 0;
}
i = 0;
++row;
if ( row >= rows )
break;
if (c == '\n')
goto newline;
else if (c != EOF)
obuf[i++] += gmap[c];
}
break;
default:
if (i == cols)
{
if (! trunc)
{
pm_message("Warning: row %d being truncated at %d columns",
row+1, cols);
trunc = 1;
}
continue;
}
if (c > 0x7f) /* !isascii(c) */
{
if (!warned)
{
pm_message("Warning: non-ASCII char(s) in input");
warned = TRUE;
}
c &= 0x7f; /* toascii(c) */
}
obuf[i++] += gmap[c];
break;
}
}
pm_close( ifd );
pgm_writepgm( stdout, grays, cols, rows, maxval, 0 );
return 0;
}
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