1 files changed, 93 insertions, 0 deletions
diff --git a/j2kviewer/src/PgmImage.java b/j2kviewer/src/PgmImage.java
new file mode 100644
index 00000000..324fbfab
--- /dev/null
+++ b/j2kviewer/src/PgmImage.java
@@ -0,0 +1,93 @@
+import java.awt.*;
+import java.awt.image.*;
+import java.net.*;
+import java.io.*;
+import java.util.regex.*;
+
+class PgmImage extends Component
+{
+  private Socket s;
+  private BufferedReader in;
+  private int x, y;
+  
+  PgmImage()
+  {
+  }
+  
+  private String read()
+  {
+    try { return in.readLine(); }
+    catch (IOException e) {
+      e.printStackTrace();
+      return null;
+    }
+  }
+  
+  public Image open(String filename)
+  {
+    String  str;
+    Pattern pat;
+    Matcher mat;
+    int bytes, width, height, depth;
+    FileInputStream fis;
+    
+    try {
+      in  = new BufferedReader(
+              new InputStreamReader(
+	        fis = new FileInputStream(
+		  new File(filename))));
+
+      pat = Pattern.compile("^P5$");
+      mat = pat.matcher(str = read());
+      mat.matches();
+      pat = Pattern.compile("^(\\d+) (\\d+)$");
+      mat = pat.matcher(str = read());
+      mat.matches();
+      x = new Integer(mat.group(1)).intValue();
+      y = new Integer(mat.group(2)).intValue();
+      width  = x;
+      height = y;
+      depth  = 1;
+      pat = Pattern.compile("^255$");
+      mat = pat.matcher(str = read());
+      mat.matches();
+      bytes = x*y;
+      char[] buf = new char[bytes];
+      int r, offset = 0;
+      while (bytes > 0) {
+	try { r = in.read(buf, offset, bytes); offset += r; bytes -= r; }
+	catch (IOException e) { e.printStackTrace(); }
+      }
+      int[] buf2 = new int[buf.length];
+      if (depth == 3) {
+	for (int i = 0; i < buf.length/3; ++i)
+	  buf2[i] = 0xFF << 24 | buf[3*i] << 16 | buf[3*i+1] << 8 | buf[3*i+2];
+      } else {
+	for (int i = 0; i < buf.length; ++i)
+	  buf2[i] = 0xFF << 24 | buf[i] << 16 | buf[i] << 8 | buf[i];
+      }
+      fis.close();
+      return createImage(new MemoryImageSource(width, height, buf2, 0, width));
+    } catch (IOException e) { e.printStackTrace(); }
+    return null;
+  }
+
+  public void close()
+  {
+  }
+  
+  public boolean bye()
+  {
+    return true;
+  }
+  
+  public int getXOffset()
+  {
+    return x;
+  }
+  
+  public int getYOffset()
+  {
+    return y;
+  }
+}