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