/*** * ASM: a very small and fast Java bytecode manipulation framework * Copyright (c) 2000-2007 INRIA, France Telecom * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the copyright holders nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF * THE POSSIBILITY OF SUCH DAMAGE. */ package org.botnode.asm; /** * A dynamically extensible vector of bytes. This class is roughly equivalent to * a DataOutputStream on top of a ByteArrayOutputStream, but is more efficient. * * @author Eric Bruneton */ public class ByteVector { /** * The content of this vector. */ byte[] data; int length; public ByteVector() { data = new byte[64]; } public ByteVector(final int initialSize) { data = new byte[initialSize]; } public ByteVector putByte(final int b) { int length = this.length; if (length + 1 > data.length) { enlarge(1); } data[length++] = (byte) b; this.length = length; return this; } ByteVector put11(final int b1, final int b2) { int length = this.length; if (length + 2 > data.length) { enlarge(2); } byte[] data = this.data; data[length++] = (byte) b1; data[length++] = (byte) b2; this.length = length; return this; } public ByteVector putShort(final int s) { int length = this.length; if (length + 2 > data.length) { enlarge(2); } byte[] data = this.data; data[length++] = (byte) (s >>> 8); data[length++] = (byte) s; this.length = length; return this; } ByteVector put12(final int b, final int s) { int length = this.length; if (length + 3 > data.length) { enlarge(3); } byte[] data = this.data; data[length++] = (byte) b; data[length++] = (byte) (s >>> 8); data[length++] = (byte) s; this.length = length; return this; } public ByteVector putInt(final int i) { int length = this.length; if (length + 4 > data.length) { enlarge(4); } byte[] data = this.data; data[length++] = (byte) (i >>> 24); data[length++] = (byte) (i >>> 16); data[length++] = (byte) (i >>> 8); data[length++] = (byte) i; this.length = length; return this; } public ByteVector putLong(final long l) { int length = this.length; if (length + 8 > data.length) { enlarge(8); } byte[] data = this.data; int i = (int) (l >>> 32); data[length++] = (byte) (i >>> 24); data[length++] = (byte) (i >>> 16); data[length++] = (byte) (i >>> 8); data[length++] = (byte) i; i = (int) l; data[length++] = (byte) (i >>> 24); data[length++] = (byte) (i >>> 16); data[length++] = (byte) (i >>> 8); data[length++] = (byte) i; this.length = length; return this; } public ByteVector putUTF8(final String s) { int charLength = s.length(); if (length + 2 + charLength > data.length) { enlarge(2 + charLength); } int len = length; byte[] data = this.data; data[len++] = (byte) (charLength >>> 8); data[len++] = (byte) charLength; for (int i = 0; i < charLength; ++i) { char c = s.charAt(i); if (c >= '\001' && c <= '\177') { data[len++] = (byte) c; } else { int byteLength = i; for (int j = i; j < charLength; ++j) { c = s.charAt(j); if (c >= '\001' && c <= '\177') { byteLength++; } else if (c > '\u07FF') { byteLength += 3; } else { byteLength += 2; } } data[length] = (byte) (byteLength >>> 8); data[length + 1] = (byte) byteLength; if (length + 2 + byteLength > data.length) { length = len; enlarge(2 + byteLength); data = this.data; } for (int j = i; j < charLength; ++j) { c = s.charAt(j); if (c >= '\001' && c <= '\177') { data[len++] = (byte) c; } else if (c > '\u07FF') { data[len++] = (byte) (0xE0 | c >> 12 & 0xF); data[len++] = (byte) (0x80 | c >> 6 & 0x3F); data[len++] = (byte) (0x80 | c & 0x3F); } else { data[len++] = (byte) (0xC0 | c >> 6 & 0x1F); data[len++] = (byte) (0x80 | c & 0x3F); } } break; } } length = len; return this; } public ByteVector putByteArray(final byte[] b, final int off, final int len) { if (length + len > data.length) { enlarge(len); } if (b != null) { System.arraycopy(b, off, data, length, len); } length += len; return this; } private void enlarge(final int size) { int length1 = 2 * data.length; int length2 = length + size; byte[] newData = new byte[length1 > length2 ? length1 : length2]; System.arraycopy(data, 0, newData, 0, length); data = newData; } }