home *** CD-ROM | disk | FTP | other *** search
- /* 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 "pbm.h"
-
- static void ReadIconFile ARGS(( FILE* file, int* width, int* height, short** data ));
-
- int
- main( argc, argv )
- int argc;
- char* argv[];
- {
- FILE* ifp;
- bit* bitrow;
- register bit* bP;
- int rows, cols, row, col, shortcount, mask;
- short* 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 );
- }
-
- /* size in bytes of a bitmap */
- #define BitmapSize(width, height) (((((width) + 15) >> 3) &~ 1) * (height))
-
- static void
- ReadIconFile( file, width, height, data )
- FILE* file;
- int* width;
- int* height;
- short** data;
- {
- char variable[81], ch;
- int status, value, i, data_length, gotsome;
-
- gotsome = 0;
- *width = *height = -1;
- for ( ; ; )
- {
- while ( ( ch = getc( file ) ) == ',' || ch == '\n' || ch == '\t' ||
- ch == ' ' )
- ;
- for ( i = 0;
- ch != '=' && ch != ',' && ch != '\n' && ch != '\t' && ch != ' ';
- i++ )
- {
- variable[i] = ch;
- ch = getc( file );
- }
- variable[i] = '\0';
-
- if ( strcmp( variable, "*/" ) == 0 && gotsome )
- break;
-
- if ( fscanf( file, "%d", &value ) != 1 )
- continue;
-
- if ( strcmp( variable, "Width" ) == 0 )
- {
- *width = value;
- gotsome = 1;
- }
- else if ( strcmp( variable, "Height" ) == 0 )
- {
- *height = value;
- gotsome = 1;
- }
- else if ( strcmp( variable, "Depth" ) == 0 )
- {
- if ( value != 1 )
- pm_error( "invalid depth" );
- gotsome = 1;
- }
- else if ( strcmp( variable, "Format_version" ) == 0 )
- {
- if ( value != 1 )
- pm_error( "invalid Format_version" );
- gotsome = 1;
- }
- else if ( strcmp( variable, "Valid_bits_per_item" ) == 0 )
- {
- if ( value != 16 )
- pm_error( "invalid Valid_bits_per_item" );
- gotsome = 1;
- }
- }
-
- if ( *width <= 0 )
- pm_error( "invalid width: %d", *width );
- if ( *height <= 0 )
- pm_error( "invalid height: %d", *height );
-
- data_length = BitmapSize( *width, *height );
- *data = (short*) malloc( data_length );
- if ( *data == 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", *data );
- else
- status = fscanf( file, ", 0x%4hx", *data + i );
- if ( status != 1 )
- pm_error( "error 4 scanning bits item" );
- }
- }
-