124 lines
3.9 KiB
Java
124 lines
3.9 KiB
Java
/*
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* Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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package gc.stress.gcbasher;
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class ByteCursor {
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private int offset;
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private byte[] data;
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public ByteCursor(byte[] data) {
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this.offset = 0;
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this.data = data;
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}
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public int getOffset() {
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return offset;
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}
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public void skipBytes(int n) {
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offset += n;
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}
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public int readUnsignedByte() {
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int val = readUnsignedByteAt(offset);
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offset += 1;
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return val;
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}
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public int readUnsignedByteAt(int offset) {
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return data[offset++] & 0xff;
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}
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public int readUnsignedShort() {
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int val = readUnsignedShortAt(offset);
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offset += 2;
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return val;
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}
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public int readInt() {
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int val = readIntAt(offset);
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offset += 4;
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return val;
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}
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public int readUnsignedShortAt(int offset) {
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int b1 = data[offset++] & 0xff;
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int b2 = data[offset] & 0xff;
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return (b1 << 8) + b2;
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}
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public int readIntAt(int offset) {
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int s1 = readUnsignedShortAt(offset);
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int s2 = readUnsignedShortAt(offset + 2);
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return (s1 << 16) + s2;
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}
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public String readUtf8(int length) throws IllegalStateException {
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char str[] = new char[length];
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int count = 0;
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int pos = 0;
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while (count < length) {
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int c = readUnsignedByte();
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switch (c >> 4) {
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case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: {
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// 0xxxxxxx
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count++;
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if(c == '/') {
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str[pos++] = '.';
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} else {
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str[pos++] = (char) c;
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}
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break;
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} case 12: case 13: {
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// 110x xxxx 10xx xxxx
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count += 2;
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int c2 = readUnsignedByte();
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if ((c2 & 0xC0) != 0x80) {
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throw new IllegalStateException();
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}
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str[pos++] = (char) (((c & 0x1F) << 6) | (c2 & 0x3F));
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break;
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} case 14: {
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// 1110 xxxx 10xx xxxx 10xx xxxx
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count += 3;
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int c2 = readUnsignedByte();
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int c3 = readUnsignedByte();
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if ((c2 & 0xC0) != 0x80 || (c3 & 0xC0) != 0x80) {
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throw new IllegalStateException();
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}
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str[pos++] = (char)(((c & 0x0F) << 12) |
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((c2 & 0x3F) << 6) |
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((c3 & 0x3F) << 0));
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break;
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} default:
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// 10xx xxxx, 1111 xxxx
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throw new IllegalStateException();
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}
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}
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return new String(str);
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}
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}
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