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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 "pgm.h"
static int gethexit ARGS(( FILE* ifp ));
int
main( argc, argv )
int argc;
char *argv[];
{
FILE *ifp;
register gray **grays, *gP;
int argn, row;
register int col;
int maxval;
int rows = 0, cols = 0, depth = 0, xrows = 0, xcols = 0, xdepth = 0;
#define STRSIZE 1000
char buf[STRSIZE], firstname[STRSIZE], lastname[STRSIZE], email[STRSIZE];
pgm_init( &argc, argv );
argn = 1;
if ( argn < argc )
{
ifp = pm_openr( argv[argn] );
argn++;
}
else
ifp = stdin;
if ( argn != argc )
pm_usage( "[fsfile]" );
/* Read the FaceSaver(tm) header. */
for ( ; ; )
{
if ( fgets( buf, STRSIZE, ifp ) == (char *) 0 )
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 ) )
{
float rowratio, colratio;
rowratio = (float) xrows / (float) rows;
colratio = (float) xcols / (float) cols;
pm_message(
"warning, non-square pixels; to fix do a 'pamscale -%cscale %g'",
rowratio > colratio ? 'y' : 'x',
rowratio > colratio ? rowratio / colratio : colratio / rowratio );
}
/* Now read the hex bits. */
grays = pgm_allocarray( cols, rows );
for ( row = rows - 1; row >= 0; row--)
{
for ( col = 0, gP = grays[row]; col < cols; col++, gP++ )
{
*gP = gethexit( ifp ) << 4;
*gP += gethexit( ifp );
}
}
pm_close( ifp );
/* And write out the graymap. */
pgm_writepgm( stdout, grays, cols, rows, (gray) maxval, 0 );
pm_close( stdout );
exit( 0 );
}
static int
gethexit( ifp )
FILE *ifp;
{
register int i;
register char c;
for ( ; ; )
{
i = getc( ifp );
if ( i == EOF )
pm_error( "EOF / read error" );
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. */
}
}
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