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PC World Komputer 1995 November
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xbmimage.java
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1995-08-11
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/*
* @(#)XbmImage.java 1.10 95/01/31 James Gosling
*
* Copyright (c) 1994 Sun Microsystems, Inc. All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software
* and its documentation for NON-COMMERCIAL purposes and without
* fee is hereby granted provided that this copyright notice
* appears in all copies. Please refer to the file "copyright.html"
* for further important copyright and licensing information.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
* THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
*/
/*-
* Reads xbitmap format images into a DIBitmap structure.
*/
package awt;
import java.util.*;
import java.io.*;
/**
* Parse files of the form:
*
* #define foo_width w
* #define foo_height h
* static char foo_bits[] = {
* 0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,
* 0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,
* 0xnn,0xnn,0xnn,0xnn};
*
* @version 1.10 31 Jan 1995
* @author James Gosling
*/
public class XbmImage extends DIBitmap {
private static final boolean verbose = true;
private static final int BUFSIZE = 1024;
private static void error(String s1) {
throw new Exception(s1);
}
public XbmImage (String fname) {
this(new BufferedInputStream(new FileInputStream(fname), BUFSIZE));
}
public XbmImage (InputStream s) {
char nm[] = new char[80];
int c;
int i = 0;
int state = 0;
int H = 0;
int W = 0;
int x = 0;
int y = 0;
boolean start = true;
int rpos = 0;
while ((c = s.read()) != -1) {
if ('a' <= c && c <= 'z' ||
'A' <= c && c <= 'Z' ||
'0' <= c && c <= '9' || c == '#' || c == '_') {
if (i < 78)
nm[i++] = (char) c;
} else if (i > 0) {
int nc = i;
i = 0;
if (start) {
if (nc != 7 ||
nm[0] != '#' ||
nm[1] != 'd' ||
nm[2] != 'e' ||
nm[3] != 'f' ||
nm[4] != 'i' ||
nm[5] != 'n' ||
nm[6] != 'e')
throw new FileFormatException("Not an XBM file");
start = false;
}
if (nm[nc - 1] == 'h')
state = 1; /* expecting width */
else if (nm[nc - 1] == 't' && nc > 1 && nm[nc - 2] == 'h')
state = 2; /* expecting height */
else if (nc > 2 && state < 0 && nm[0] == '0' && nm[1] == 'x') {
int n = 0;
for (int p = 2; p < nc; p++) {
c = nm[p];
if ('0' <= c && c <= '9')
c = c - '0';
else if ('A' <= c && c <= 'Z')
c = c - 'A' + 10;
else if ('a' <= c && c <= 'z')
c = c - 'a' + 10;
else
c = 0;
n = n * 16 + c;
}
for (int mask = 1; mask <= 0x80; mask <<= 1) {
if (x < W) {
if ((n & mask) != 0)
raster[rpos] = 1;
rpos++;
}
x++;
}
if (x >= W) {
x = 0;
y++;
}
} else {
int n = 0;
for (int p = 0; p < nc; p++)
if ('0' <= (c = nm[p]) && c <= '9')
n = n * 10 + c - '0';
else {
n = -1;
break;
}
if (n > 0 && state > 0) {
if (state == 1)
W = n;
else
H = n;
if (W == 0 || H == 0)
state = 0;
else {
raster = new byte[W * H];
red = new byte[2];
green = red;
blue = red;
red[0] = (byte) 255;
red[1] = 0;
width = W;
height = H;
num_colors = 2;
state = -1;
}
}
}
}
}
s.close();
}
}