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/* icontopbm.c - read a Sun icon file and produce a portable 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 <string.h>
#include "nstring.h"
#include "pbm.h"
/* size in bytes of a bitmap */
#define BitmapSize(width, height) (((((width) + 15) >> 3) &~ 1) * (height))
static void
ReadIconFile(FILE * const file,
int * const widthP,
int * const heightP,
short unsigned int ** const dataP) {
char variable[80+1];
int ch;
int status, value, i, data_length, gotsome;
gotsome = 0;
*widthP = *heightP = -1;
for ( ; ; )
{
while ( ( ch = getc( file ) ) == ',' || ch == '\n' || ch == '\t' ||
ch == ' ' )
;
for ( i = 0;
ch != '=' && ch != ',' && ch != '\n' && ch != '\t' &&
ch != ' ' && (i < (sizeof(variable) - 1));
i++ )
{
variable[i] = ch;
if ((ch = getc( file )) == EOF)
pm_error( "invalid input file -- premature EOF" );
}
variable[i] = '\0';
if ( streq( variable, "*/" )&& gotsome )
break;
if ( fscanf( file, "%d", &value ) != 1 )
continue;
if ( streq( variable, "Width" ) )
{
*widthP = value;
gotsome = 1;
}
else if ( streq( variable, "Height" ) )
{
*heightP = value;
gotsome = 1;
}
else if ( streq( variable, "Depth" ) )
{
if ( value != 1 )
pm_error( "invalid depth" );
gotsome = 1;
}
else if ( streq( variable, "Format_version" ) )
{
if ( value != 1 )
pm_error( "invalid Format_version" );
gotsome = 1;
}
else if ( streq( variable, "Valid_bits_per_item" ) )
{
if ( value != 16 )
pm_error( "invalid Valid_bits_per_item" );
gotsome = 1;
}
}
if ( *widthP <= 0 )
pm_error( "invalid width (must be positive): %d", *widthP );
if ( *heightP <= 0 )
pm_error( "invalid height (must be positive): %d", *heightP );
data_length = BitmapSize( *widthP, *heightP );
*dataP = (short unsigned int *) malloc( data_length );
if ( *dataP == NULL )
pm_error( "out of memory" );
data_length /= sizeof( short );
for ( i = 0 ; i < data_length; i++ )
{
if ( i == 0 )
status = fscanf( file, " 0x%4hx", *dataP );
else
status = fscanf( file, ", 0x%4hx", *dataP + i );
if ( status != 1 )
pm_error( "error 4 scanning bits item" );
}
}
int
main(int argc, char ** argv) {
FILE* ifp;
bit* bitrow;
register bit* bP;
int rows, cols, row, col, shortcount, mask;
short unsigned int * data;
pbm_init( &argc, argv );
if ( argc > 2 )
pm_usage( "[iconfile]" );
if ( argc == 2 )
ifp = pm_openr( argv[1] );
else
ifp = stdin;
ReadIconFile( ifp, &cols, &rows, &data );
pm_close( ifp );
pbm_writepbminit( stdout, cols, rows, 0 );
bitrow = pbm_allocrow( cols );
for ( row = 0; row < rows; row++ )
{
shortcount = 0;
mask = 0x8000;
for ( col = 0, bP = bitrow; col < cols; col++, bP++ )
{
if ( shortcount >= 16 )
{
data++;
shortcount = 0;
mask = 0x8000;
}
*bP = ( *data & mask ) ? PBM_BLACK : PBM_WHITE;
shortcount++;
mask = mask >> 1;
}
data++;
pbm_writepbmrow( stdout, bitrow, cols, 0 );
}
pm_close( stdout );
exit( 0 );
}
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