From a0d1c9051c12cdf52d5d4c3b061c4e7566089045 Mon Sep 17 00:00:00 2001
From: jochen <jochen@379699f6-c40d-0410-875b-85095c16579e>
Date: Tue, 27 Apr 1999 18:01:13 +0000
Subject: [PATCH] new attribute handling

git-svn-id: https://svn.code.sf.net/p/jode/code/trunk@617 379699f6-c40d-0410-875b-85095c16579e
---
 jode/jode/bytecode/BinaryInfo.java | 148 ++++++++++++++++++++++++++---
 1 file changed, 133 insertions(+), 15 deletions(-)

diff --git a/jode/jode/bytecode/BinaryInfo.java b/jode/jode/bytecode/BinaryInfo.java
index d3bdb8a..622f023 100644
--- a/jode/jode/bytecode/BinaryInfo.java
+++ b/jode/jode/bytecode/BinaryInfo.java
@@ -19,6 +19,8 @@
 
 package jode.bytecode;
 import java.io.*;
+import java.util.Enumeration;
+import jode.util.SimpleDictionary;
 
 /**
  *
@@ -34,18 +36,7 @@ public class BinaryInfo {
 
     private int status = 0;
 
-    protected AttributeInfo[] attributes;
-
-    public AttributeInfo findAttribute(String name) {
-        for (int i=0; i< attributes.length; i++)
-            if (attributes[i].getName().equals(name))
-                return attributes[i];
-        return null;
-    }
-
-    public AttributeInfo[] getAttributes() {
-	return attributes;
-    }
+    protected SimpleDictionary unknownAttributes;
 
     protected void skipAttributes(DataInputStream input) throws IOException {
         int count = input.readUnsignedShort();
@@ -61,17 +52,144 @@ public class BinaryInfo {
         }
     }
 
+    protected int getKnownAttributeCount() {
+	return 0;
+    }
+
+    protected void readAttribute(String name, int length,
+				 ConstantPool constantPool,
+				 DataInputStream input, 
+				 int howMuch) throws IOException {
+	byte[] data = new byte[length];
+	input.readFully(data);
+	unknownAttributes.put(name, data);
+    }
+
+    class ConstrainedInputStream extends FilterInputStream {
+	int length;
+
+	public ConstrainedInputStream(int attrLength, InputStream input) {
+	    super(input);
+	    length = attrLength;
+	}
+
+	public int read() throws IOException {
+	    if (length > 0) {
+		int data = super.read();
+		length--;
+		return data;
+	    }
+	    throw new EOFException();
+	}
+
+	public int read(byte[] b, int off, int len) throws IOException {
+	    if (length < len) {
+		len = length;
+	    }
+	    if (len == 0)
+		return -1;
+	    int count = super.read(b, off, len);
+	    length -= count;
+	    return count;
+	}
+
+	public int read(byte[] b) throws IOException {
+	    return read(b, 0, b.length);
+	}
+
+	public long skip(long count) throws IOException {
+	    if (length < count) {
+		count = length;
+	    }
+	    count = super.skip(count);
+	    length -= (int) count;
+	    return count;
+	}
+
+	public void skipRemaining() throws IOException {
+	    while (length > 0) {
+		int skipped = (int) skip(length);
+		if (skipped == 0)
+		    throw new EOFException();
+		length -= skipped;
+	    }
+	}
+    }
+
     protected void readAttributes(ConstantPool constantPool,
                                   DataInputStream input, 
                                   int howMuch) throws IOException {
         if ((howMuch & ALL_ATTRIBUTES) != 0) {
             int count = input.readUnsignedShort();
-            attributes = new AttributeInfo[count];
+	    unknownAttributes = new SimpleDictionary();
             for (int i=0; i< count; i++) {
-                attributes[i] = new AttributeInfo(); 
-                attributes[i].read(constantPool, input, howMuch);
+		String attrName = 
+		    constantPool.getUTF8(input.readUnsignedShort());
+		final int attrLength = input.readInt();
+		ConstrainedInputStream constrInput = 
+		    new ConstrainedInputStream(attrLength, input);
+		readAttribute(attrName, attrLength, 
+			      constantPool, new DataInputStream(constrInput),
+			      howMuch);
+		constrInput.skipRemaining();
             }
 	} else
             skipAttributes(input);
     }
+
+    protected void prepareAttributes(GrowableConstantPool gcp) {
+	Enumeration enum = unknownAttributes.keys();
+	while (enum.hasMoreElements())
+	    gcp.putUTF8((String) enum.nextElement());
+    }
+
+    protected void writeKnownAttributes
+	(GrowableConstantPool constantPool, 
+	 DataOutputStream output) throws IOException {
+    }
+
+    protected void writeAttributes
+	(GrowableConstantPool constantPool, 
+	 DataOutputStream output) throws IOException {
+	int count = unknownAttributes.size() + getKnownAttributeCount();
+	output.writeShort(count);
+	writeKnownAttributes(constantPool, output);
+	Enumeration keys = unknownAttributes.keys();
+	Enumeration elts = unknownAttributes.elements();
+	while (keys.hasMoreElements()) {
+	    String name = (String) keys.nextElement();
+	    byte[] data = (byte[]) elts.nextElement();
+	    output.writeShort(constantPool.putUTF8(name));
+	    output.writeInt(data.length);
+	    output.write(data);
+	}
+    }
+
+    public int getAttributeSize() {
+	int size = 2; /* attribute count */
+	Enumeration enum = unknownAttributes.elements();
+	while (enum.hasMoreElements())
+	    size += 2 + 4 + ((byte[]) enum.nextElement()).length;
+	return size;
+    }
+    
+    public byte[] findAttribute(String name) {
+	return (byte[]) unknownAttributes.get(name);
+    }
+
+    public Enumeration getAttributes() {
+	return unknownAttributes.elements();
+    }
+
+    public void setAttribute(String name, byte[] content) {
+	unknownAttributes.put(name, content);
+    }
+
+    public byte[] removeAttribute(String name) {
+	return (byte[]) unknownAttributes.remove(name);
+    }
+
+    public void removeAllAttributes() {
+	unknownAttributes = new SimpleDictionary();
+    }
 }