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/* pgmtofs.c - convert portable graymap to Usenix FaceSaver(tm) format
**
** Copyright (C) 1991 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 "pgm.h"
static void putinit ARGS(( int cols, int rows, int bps ));
static void putitem ARGS(( void ));
static void putgray ARGS(( gray g ));
static void putrest ARGS(( void ));
int
main( argc, argv )
int argc;
char* argv[];
{
FILE* ifp;
gray** grays;
register gray* gP;
int argn, rows, cols, bps, padright, row, col;
gray maxval, nmaxval;
const char* const usage = "[pgmfile]";
pgm_init( &argc, argv );
argn = 1;
if ( argn < argc )
{
ifp = pm_openr( argv[argn] );
++argn;
}
else
{
ifp = stdin;
}
if ( argn != argc )
pm_usage( usage );
grays = pgm_readpgm( ifp, &cols, &rows, &maxval );
pm_close( ifp );
/* Figure out bps. */
bps = pm_maxvaltobits( (int) maxval );
if ( bps > 2 && bps < 4 )
bps = 4;
else if ( bps > 4 && bps < 8 )
bps = 8;
else if ( bps > 8 )
pm_error(
"maxval of %d is too large for FaceSaver(tm)", maxval );
nmaxval = pm_bitstomaxval( bps );
/* Compute padding to round cols * bps up to the nearest multiple of 8. */
padright = ( ( cols * bps + 7 ) / 8 ) * 8 - cols * bps;
putinit( cols, rows, bps );
for ( row = rows - 1; row >= 0; --row )
{
for ( col = 0, gP = grays[row]; col < cols; ++col, ++gP )
{
if ( maxval != nmaxval )
*gP = (int) *gP * nmaxval / maxval;
putgray( *gP );
}
for ( col = 0; col < padright; ++col )
putgray( 0 );
}
putrest( );
exit( 0 );
}
static int bitspersample, item, bitsperitem, bitshift, itemsperline, items;
static void
putinit( cols, rows, bps )
int cols, rows, bps;
{
printf( "FirstName: \n" );
printf( "LastName: \n" );
printf( "E-mail: \n" );
printf( "Telephone: \n" );
printf( "Company: \n" );
printf( "Address1: \n" );
printf( "Address2: \n" );
printf( "CityStateZip: \n" );
printf( "Date: \n" );
printf( "PicData: %d %d %d\n", cols, rows, bps );
printf( "Image: %d %d %d\n", cols, rows, bps );
printf( "\n" );
bitspersample = bps;
itemsperline = items = 0;
item = 0;
bitsperitem = 0;
bitshift = 8 - bitspersample;
}
static void
putitem( )
{
const char* const hexits = "0123456789abcdef";
if ( itemsperline == 30 )
{
putchar( '\n' );
itemsperline = 0;
}
putchar( hexits[item >> 4] );
putchar( hexits[item & 15] );
++itemsperline;
++items;
item = 0;
bitsperitem = 0;
bitshift = 8 - bitspersample;
}
static void
putgray( gray g )
{
if ( bitsperitem == 8 )
putitem( );
item += g << bitshift;
bitsperitem += bitspersample;
bitshift -= bitspersample;
}
static void
putrest( )
{
if ( bitsperitem > 0 )
putitem( );
printf( "\n" );
}
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