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Usenet 1994 October
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usenetsourcesnewsgroupsinfomagicoctober1994disk2.iso
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misc
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volume2
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pbm
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Part2
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pbmtocbm.c
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C/C++ Source or Header
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1991-08-07
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97 lines
/* pbmtocbm.c - read a portable bitmap and produce a compact bitmap
**
** Copyright (C) 1988 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 <stdio.h>
#include "pbm.h"
main( argc, argv )
int argc;
char *argv[];
{
FILE *ifd;
bit **bits;
int rows, cols, row, col;
if ( argc > 2 )
{
fprintf( stderr, "usage: %s [pbmfile]\n", argv[0] );
exit( 1 );
}
if ( argc == 2 )
{
ifd = fopen( argv[1], "r" );
if ( ifd == NULL )
{
fprintf( stderr, "%s: can't open.\n", argv[1] );
exit( 1 );
}
}
else
ifd = stdin;
bits = pbm_readpbm( ifd, &cols, &rows );
if ( ifd != stdin )
fclose( ifd );
putchar( (char) 42 );
putchar( (char) 23 );
putchar( (char) ( ( cols >> 8 ) & 0xff ) );
putchar( (char) ( cols & 0xff ) );
putchar( (char) ( ( rows >> 8 ) & 0xff ) );
putchar( (char) ( rows & 0xff ) );
putinit( );
for ( row = 0; row < rows; row++ )
for ( col = 0; col < cols; col++ )
putbit( bits[row][col] );
putrest( );
exit( 0 );
}
int item, bitsperitem, bitshift;
putinit( )
{
bitsperitem = 0;
item = 0;
bitshift = 7;
}
putbit( b )
bit b;
{
if ( bitsperitem == 8 )
putitem( );
bitsperitem++;
if ( b )
item += 1 << bitshift;
bitshift--;
}
putrest( )
{
if ( bitsperitem > 0 )
putitem( );
}
putitem( )
{
putchar( (char) item );
bitsperitem = 0;
item = 0;
bitshift = 7;
}