| /******************************************************************************* |
| * Copyright (c) 2000, 2009 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jdt.internal.compiler.classfmt; |
| |
| abstract public class ClassFileStruct { |
| byte[] reference; |
| int[] constantPoolOffsets; |
| int structOffset; |
| public ClassFileStruct(byte[] classFileBytes, int[] offsets, int offset) { |
| this.reference = classFileBytes; |
| this.constantPoolOffsets = offsets; |
| this.structOffset = offset; |
| } |
| public double doubleAt(int relativeOffset) { |
| return (Double.longBitsToDouble(i8At(relativeOffset))); |
| } |
| public float floatAt(int relativeOffset) { |
| return (Float.intBitsToFloat(i4At(relativeOffset))); |
| } |
| public int i4At(int relativeOffset) { |
| int position = relativeOffset + this.structOffset; |
| return ((this.reference[position++] & 0xFF) << 24) | ((this.reference[position++] & 0xFF) << 16) | ((this.reference[position++] & 0xFF) << 8) + (this.reference[position] & 0xFF); |
| } |
| public long i8At(int relativeOffset) { |
| int position = relativeOffset + this.structOffset; |
| return (((long) (this.reference[position++] & 0xFF)) << 56) |
| | (((long) (this.reference[position++] & 0xFF)) << 48) |
| | (((long) (this.reference[position++] & 0xFF)) << 40) |
| | (((long) (this.reference[position++] & 0xFF)) << 32) |
| | (((long) (this.reference[position++] & 0xFF)) << 24) |
| | (((long) (this.reference[position++] & 0xFF)) << 16) |
| | (((long) (this.reference[position++] & 0xFF)) << 8) |
| | (this.reference[position++] & 0xFF); |
| } |
| protected void reset() { |
| this.reference = null; |
| this.constantPoolOffsets = null; |
| } |
| public int u1At(int relativeOffset) { |
| return (this.reference[relativeOffset + this.structOffset] & 0xFF); |
| } |
| public int u2At(int relativeOffset) { |
| int position = relativeOffset + this.structOffset; |
| return ((this.reference[position++] & 0xFF) << 8) | (this.reference[position] & 0xFF); |
| } |
| public long u4At(int relativeOffset) { |
| int position = relativeOffset + this.structOffset; |
| return (((this.reference[position++] & 0xFFL) << 24) | ((this.reference[position++] & 0xFF) << 16) | ((this.reference[position++] & 0xFF) << 8) | (this.reference[position] & 0xFF)); |
| } |
| public char[] utf8At(int relativeOffset, int bytesAvailable) { |
| int length = bytesAvailable; |
| char outputBuf[] = new char[bytesAvailable]; |
| int outputPos = 0; |
| int readOffset = this.structOffset + relativeOffset; |
| |
| while (length != 0) { |
| int x = this.reference[readOffset++] & 0xFF; |
| length--; |
| if ((0x80 & x) != 0) { |
| if ((x & 0x20) != 0) { |
| length-=2; |
| x = ((x & 0xF) << 12) | ((this.reference[readOffset++] & 0x3F) << 6) | (this.reference[readOffset++] & 0x3F); |
| } else { |
| length--; |
| x = ((x & 0x1F) << 6) | (this.reference[readOffset++] & 0x3F); |
| } |
| } |
| outputBuf[outputPos++] = (char) x; |
| } |
| |
| if (outputPos != bytesAvailable) { |
| System.arraycopy(outputBuf, 0, (outputBuf = new char[outputPos]), 0, outputPos); |
| } |
| return outputBuf; |
| } |
| } |