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package com.github.rapidark.framework.thirdparty.asm;

public class Attribute {
	public final String type;
	byte[] value;
	Attribute next;

	protected Attribute(String type) {
		this.type = type;
	}

	public boolean isUnknown() {
		return true;
	}

	public boolean isCodeAttribute() {
		return false;
	}

	protected Label[] getLabels() {
		return null;
	}

	protected Attribute read(ClassReader cr, int off, int len, char[] buf, int codeOff, Label[] labels) {
		Attribute attr = new Attribute(this.type);
		attr.value = new byte[len];
		System.arraycopy(cr.b, off, attr.value, 0, len);
		return attr;
	}

	protected ByteVector write(ClassWriter cw, byte[] code, int len, int maxStack, int maxLocals) {
		ByteVector v = new ByteVector();
		v.data = this.value;
		v.length = this.value.length;
		return v;
	}

	final int getCount() {
		int count = 0;
		Attribute attr = this;
		while (attr != null) {
			count++;
			attr = attr.next;
		}
		return count;
	}

	final int getSize(ClassWriter cw, byte[] code, int len, int maxStack, int maxLocals) {
		Attribute attr = this;
		int size = 0;
		while (attr != null) {
			cw.newUTF8(attr.type);
			size += attr.write(cw, code, len, maxStack, maxLocals).length + 6;
			attr = attr.next;
		}
		return size;
	}

	final void put(ClassWriter cw, byte[] code, int len, int maxStack, int maxLocals, ByteVector out) {
		Attribute attr = this;
		while (attr != null) {
			ByteVector b = attr.write(cw, code, len, maxStack, maxLocals);
			out.putShort(cw.newUTF8(attr.type)).putInt(b.length);
			out.putByteArray(b.data, 0, b.length);
			attr = attr.next;
		}
	}
}