| /* |
| * Copyright (c) 2014, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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. |
| */ |
| |
| package jdk.internal.jimage; |
| |
| import java.io.UTFDataFormatException; |
| import java.nio.ByteBuffer; |
| import java.util.Objects; |
| |
| /** |
| * @implNote This class needs to maintain JDK 8 source compatibility. |
| * |
| * It is used internally in the JDK to implement jimage/jrtfs access, |
| * but also compiled and delivered as part of the jrtfs.jar to support access |
| * to the jimage file provided by the shipped JDK by tools running on JDK 8. |
| */ |
| public class ImageStringsReader implements ImageStrings { |
| public static final int HASH_MULTIPLIER = 0x01000193; |
| private final BasicImageReader reader; |
| |
| ImageStringsReader(BasicImageReader reader) { |
| this.reader = Objects.requireNonNull(reader); |
| } |
| |
| @Override |
| public String get(int offset) { |
| return reader.getString(offset); |
| } |
| |
| @Override |
| public int add(final String string) { |
| throw new InternalError("Can not add strings at runtime"); |
| } |
| |
| private static int hashCode(byte[] bytes, int offset, int count, int seed) { |
| Objects.requireNonNull(bytes); |
| |
| if (offset < 0 || count < 0 || offset > bytes.length - count) { |
| throw new IndexOutOfBoundsException("offset=" + offset + ", count=" + count); |
| } |
| |
| int limit = offset + count; |
| |
| if (limit < 0 || limit > bytes.length) { |
| throw new IndexOutOfBoundsException("limit=" + limit); |
| } |
| |
| for (int i = offset; i < limit; i++) { |
| seed = (seed * HASH_MULTIPLIER) ^ (bytes[i] & 0xFF); |
| } |
| |
| return seed & 0x7FFFFFFF; |
| } |
| |
| public static int hashCode(byte[] bytes, int seed) { |
| return hashCode(bytes, 0, bytes.length, seed); |
| } |
| |
| public static int hashCode(byte[] bytes) { |
| return hashCode(bytes, 0, bytes.length, HASH_MULTIPLIER); |
| } |
| |
| public static int hashCode(String string, int seed) { |
| return hashCode(mutf8FromString(string), seed); |
| } |
| |
| public static int hashCode(String string) { |
| return hashCode(mutf8FromString(string), HASH_MULTIPLIER); |
| } |
| |
| static int charsFromMUTF8Length(byte[] bytes, int offset, int count) { |
| int length = 0; |
| |
| for (int i = offset; i < offset + count; i++) { |
| byte ch = bytes[i]; |
| |
| if (ch == 0) { |
| break; |
| } |
| |
| if ((ch & 0xC0) != 0x80) { |
| length++; |
| } |
| } |
| |
| return length; |
| } |
| |
| static void charsFromMUTF8(char[] chars, byte[] bytes, int offset, int count) throws UTFDataFormatException { |
| int j = 0; |
| |
| for (int i = offset; i < offset + count; i++) { |
| byte ch = bytes[i]; |
| |
| if (ch == 0) { |
| break; |
| } |
| |
| boolean is_unicode = (ch & 0x80) != 0; |
| int uch = ch & 0x7F; |
| |
| if (is_unicode) { |
| int mask = 0x40; |
| |
| while ((uch & mask) != 0) { |
| ch = bytes[++i]; |
| |
| if ((ch & 0xC0) != 0x80) { |
| throw new UTFDataFormatException("bad continuation 0x" + Integer.toHexString(ch)); |
| } |
| |
| uch = ((uch & ~mask) << 6) | (ch & 0x3F); |
| mask <<= 6 - 1; |
| } |
| |
| if ((uch & 0xFFFF) != uch) { |
| throw new UTFDataFormatException("character out of range \\u" + Integer.toHexString(uch)); |
| } |
| } |
| |
| chars[j++] = (char)uch; |
| } |
| } |
| |
| public static String stringFromMUTF8(byte[] bytes, int offset, int count) { |
| int length = charsFromMUTF8Length(bytes, offset, count); |
| char[] chars = new char[length]; |
| |
| try { |
| charsFromMUTF8(chars, bytes, offset, count); |
| } catch (UTFDataFormatException ex) { |
| throw new InternalError("Attempt to convert non modified UTF-8 byte sequence", ex); |
| } |
| |
| return new String(chars); |
| } |
| |
| public static String stringFromMUTF8(byte[] bytes) { |
| return stringFromMUTF8(bytes, 0, bytes.length); |
| } |
| |
| static int charsFromByteBufferLength(ByteBuffer buffer) { |
| int length = 0; |
| |
| while(buffer.hasRemaining()) { |
| byte ch = buffer.get(); |
| |
| if (ch == 0) { |
| return length; |
| } |
| |
| if ((ch & 0xC0) != 0x80) { |
| length++; |
| } |
| } |
| |
| throw new InternalError("No terminating zero byte for modified UTF-8 byte sequence"); |
| } |
| |
| static void charsFromByteBuffer(char chars[], ByteBuffer buffer) { |
| int j = 0; |
| |
| while(buffer.hasRemaining()) { |
| byte ch = buffer.get(); |
| |
| if (ch == 0) { |
| return; |
| } |
| |
| boolean is_unicode = (ch & 0x80) != 0; |
| int uch = ch & 0x7F; |
| |
| if (is_unicode) { |
| int mask = 0x40; |
| |
| while ((uch & mask) != 0) { |
| ch = buffer.get(); |
| |
| if ((ch & 0xC0) != 0x80) { |
| throw new InternalError("Bad continuation in " + |
| "modified UTF-8 byte sequence: " + ch); |
| } |
| |
| uch = ((uch & ~mask) << 6) | (ch & 0x3F); |
| mask <<= 6 - 1; |
| } |
| } |
| |
| if ((uch & 0xFFFF) != uch) { |
| throw new InternalError("UTF-32 char in modified UTF-8 " + |
| "byte sequence: " + uch); |
| } |
| |
| chars[j++] = (char)uch; |
| } |
| |
| throw new InternalError("No terminating zero byte for modified UTF-8 byte sequence"); |
| } |
| |
| public static String stringFromByteBuffer(ByteBuffer buffer) { |
| int length = charsFromByteBufferLength(buffer); |
| buffer.rewind(); |
| char[] chars = new char[length]; |
| charsFromByteBuffer(chars, buffer); |
| |
| return new String(chars); |
| } |
| |
| static int mutf8FromCharsLength(char chars[]) { |
| int length = 0; |
| |
| for (char ch : chars) { |
| int uch = ch & 0xFFFF; |
| |
| if ((uch & ~0x7F) != 0) { |
| int mask = ~0x3F; |
| int n = 0; |
| |
| do { |
| n++; |
| uch >>= 6; |
| mask >>= 1; |
| } while ((uch & mask) != 0); |
| |
| length += n + 1; |
| } else if (uch == 0) { |
| length += 2; |
| } else { |
| length++; |
| } |
| } |
| |
| return length; |
| } |
| |
| static void mutf8FromChars(byte[] bytes, int offset, char chars[]) { |
| int j = offset; |
| byte[] buffer = new byte[8]; |
| |
| for (char ch : chars) { |
| int uch = ch & 0xFFFF; |
| |
| if ((uch & ~0x7F) != 0) { |
| int mask = ~0x3F; |
| int n = 0; |
| |
| do { |
| buffer[n++] = (byte)(0x80 | (uch & 0x3F)); |
| uch >>= 6; |
| mask >>= 1; |
| } while ((uch & mask) != 0); |
| |
| buffer[n] = (byte)((mask << 1) | uch); |
| |
| do { |
| bytes[j++] = buffer[n--]; |
| } while (0 <= n); |
| } else if (uch == 0) { |
| bytes[j++] = (byte)0xC0; |
| bytes[j++] = (byte)0x80; |
| } else { |
| bytes[j++] = (byte)uch; |
| } |
| } |
| } |
| |
| public static byte[] mutf8FromString(String string) { |
| char[] chars = string.toCharArray(); |
| int length = mutf8FromCharsLength(chars); |
| byte[] bytes = new byte[length]; |
| mutf8FromChars(bytes, 0, chars); |
| |
| return bytes; |
| } |
| } |
