org.jboss.marshalling.UTFUtils Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
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/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jboss.marshalling;
import java.io.IOException;
import java.io.UTFDataFormatException;
import java.io.EOFException;
/**
* Handy utility methods for dealing with strings in the modified UTF-8 format.
* @apiviz.exclude
*/
public final class UTFUtils {
private static final String INVALID_BYTE = "Invalid byte";
private static final String MALFORMED = "Malformed UTF-8 sequence";
private UTFUtils() {
}
private static final int UTF_BUFS_CHAR_CNT = 256;
private static final int UTF_BUFS_BYTE_CNT = UTF_BUFS_CHAR_CNT * 3;
private static final class BytesHolder extends ThreadLocal {
protected byte[] initialValue() {
return new byte[UTF_BUFS_BYTE_CNT];
}
}
private static final BytesHolder BYTES_HOLDER = new BytesHolder();
/**
* Get the number of bytes used by the modified UTF-8 encoded form of the given string. If the length is
* greater than {@code 65536}, an exception is thrown.
*
* @param s the string
* @return the length
* @throws UTFDataFormatException if the string is longer than {@code 65536} characters
* @see java.io.DataInput#readUTF()
*/
public static int getShortUTFLength(final String s) throws UTFDataFormatException {
final int length = s.length();
int l = 0;
for (int i = 0; i < length; i ++) {
final char c = s.charAt(i);
if (c > 0 && c <= 0x7f) {
l ++;
} else if (c <= 0x07ff) {
l += 2;
} else {
l += 3;
}
if (l > 65535) {
throw new UTFDataFormatException("String is too long for writeUTF");
}
}
return l;
}
/**
* Get the number of bytes used by the modified UTF-8 encoded form of the given string.
*
* @param s the string
* @return the length
* @see java.io.DataInput#readUTF()
*/
public static long getLongUTFLength(final String s) {
final int length = s.length();
long l = 0;
for (int i = 0; i < length; i ++) {
final char c = s.charAt(i);
if (c > 0 && c <= 0x7f) {
l ++;
} else if (c <= 0x07ff) {
l += 2L;
} else {
l += 3L;
}
}
return l;
}
/**
* Write the modified UTF-8 form of the given string to the given output.
*
* @param output the output to write to
* @param s the string
* @throws IOException if an I/O error occurs
* @see java.io.DataOutput#writeUTF(String)
*/
public static void writeUTFBytes(final ByteOutput output, final String s) throws IOException {
final byte[] byteBuf = BYTES_HOLDER.get();
final int length = s.length();
int strIdx = 0;
int byteIdx = 0;
while (strIdx < length) {
final char c = s.charAt(strIdx ++);
if (c > 0 && c <= 0x7f) {
byteBuf[byteIdx ++] = (byte) c;
} else if (c <= 0x07ff) {
byteBuf[byteIdx ++] = (byte)(0xc0 | 0x1f & c >> 6);
byteBuf[byteIdx ++] = (byte)(0x80 | 0x3f & c);
} else {
byteBuf[byteIdx ++] = (byte)(0xe0 | 0x0f & c >> 12);
byteBuf[byteIdx ++] = (byte)(0x80 | 0x3f & c >> 6);
byteBuf[byteIdx ++] = (byte)(0x80 | 0x3f & c);
}
if (byteIdx > UTF_BUFS_BYTE_CNT - 4) {
output.write(byteBuf, 0, byteIdx);
byteIdx = 0;
}
}
if (byteIdx > 0) {
output.write(byteBuf, 0, byteIdx);
}
}
/**
* Read the given number of characters from the given byte input. The length given is in characters,
* NOT in bytes.
*
* @param input the byte source
* @param len the number of characters to read
* @return the string
* @throws IOException if an I/O error occurs
* @see java.io.DataInput#readUTF()
*/
public static String readUTFBytes(final ByteInput input, final int len) throws IOException {
final byte[] byteBuf = BYTES_HOLDER.get();
final char[] chars = new char[len];
int i = 0, cnt = 0, charIdx = 0;
while (charIdx < len) {
if (i == cnt) {
cnt = input.read(byteBuf, 0, Math.min(UTF_BUFS_BYTE_CNT, len - charIdx));
if (cnt < 0) {
throw new EOFException();
}
i = 0;
}
final int a = byteBuf[i++] & 0xff;
if (a < 0x80) {
// low bit clear
chars[charIdx ++] = (char) a;
} else if (a < 0xc0) {
throw new UTFDataFormatException(INVALID_BYTE);
} else if (a < 0xe0) {
if (i == cnt) {
cnt = input.read(byteBuf, 0, Math.min(UTF_BUFS_BYTE_CNT, len - charIdx));
if (cnt < 0) {
throw new EOFException();
}
i = 0;
}
final int b = byteBuf[i ++] & 0xff;
if ((b & 0xc0) != 0x80) {
throw new UTFDataFormatException(INVALID_BYTE);
}
chars[charIdx ++] = (char) ((a & 0x1f) << 6 | b & 0x3f);
} else if (a < 0xf0) {
if (i == cnt) {
cnt = input.read(byteBuf, 0, Math.min(UTF_BUFS_BYTE_CNT, len - charIdx));
if (cnt < 0) {
throw new EOFException();
}
i = 0;
}
final int b = byteBuf[i ++] & 0xff;
if ((b & 0xc0) != 0x80) {
throw new UTFDataFormatException(INVALID_BYTE);
}
if (i == cnt) {
cnt = input.read(byteBuf, 0, Math.min(UTF_BUFS_BYTE_CNT, len - charIdx));
if (cnt < 0) {
throw new EOFException();
}
i = 0;
}
final int c = byteBuf[i ++] & 0xff;
if ((c & 0xc0) != 0x80) {
throw new UTFDataFormatException(INVALID_BYTE);
}
chars[charIdx ++] = (char) ((a & 0x0f) << 12 | (b & 0x3f) << 6 | c & 0x3f);
} else {
throw new UTFDataFormatException(INVALID_BYTE);
}
}
return String.valueOf(chars);
}
/**
* Read the given number of characters from the given byte input. The length given is in bytes.
*
* @param input the byte source
* @param len the number of bytes to read
* @return the string
* @throws IOException if an I/O error occurs
* @see java.io.DataInput#readUTF()
*/
public static String readUTFBytesByByteCount(final ByteInput input, final long len) throws IOException {
final StringBuilder builder = new StringBuilder();
for (long i = 0; i < len; i ++) {
final int a = input.read();
if (a < 0) {
throw new EOFException("Expected " + (len - i) + " more bytes");
} else if (a == 0) {
builder.append('\0');
} else if (a < 0x80) {
builder.append((char) a);
} else if (a < 0xc0) {
throw new UTFDataFormatException(INVALID_BYTE);
} else if (a < 0xe0) {
if (++i < len) {
final int b = input.read();
if (b == -1) {
throw new EOFException("Expected " + (len - i) + " more bytes");
} else if ((b & 0xc0) != 0x80) {
throw new UTFDataFormatException(INVALID_BYTE);
}
builder.append((char) ((a & 0x1f) << 6 | b & 0x3f));
} else {
throw new UTFDataFormatException(MALFORMED);
}
} else if (a < 0xf0) {
if (++i < len) {
final int b = input.read();
if (b == -1) {
throw new EOFException("Expected " + (len - i) + " more bytes");
} else if ((b & 0xc0) != 0x80) {
throw new UTFDataFormatException(INVALID_BYTE);
}
if (++i < len) {
final int c1 = input.read();
if (c1 == -1) {
throw new EOFException("Expected " + (len - i) + " more bytes");
} else if ((c1 & 0xc0) != 0x80) {
throw new UTFDataFormatException(INVALID_BYTE);
}
builder.append((char) ((a & 0x0f) << 12 | (b & 0x3f) << 6 | c1 & 0x3f));
} else {
throw new UTFDataFormatException(MALFORMED);
}
} else {
throw new UTFDataFormatException(MALFORMED);
}
} else {
throw new UTFDataFormatException(INVALID_BYTE);
}
}
return builder.toString();
}
/**
* Read a null-terminated modified UTF-8 string from the given byte input. Bytes are read until a 0 is found or
* until the end of the stream, whichever comes first.
*
* @param input the input
* @return the string
* @throws IOException if an I/O error occurs
* @see java.io.DataInput#readUTF()
*/
public static String readUTFZBytes(final ByteInput input) throws IOException {
final StringBuilder builder = new StringBuilder();
for (;;) {
final int c = readUTFChar(input);
if (c == -1) {
return builder.toString();
}
builder.append((char) c);
}
}
private static int readUTFChar(final ByteInput input) throws IOException {
final int a = input.read();
if (a < 0) {
throw new EOFException();
} else if (a == 0) {
return -1;
} else if (a < 0x80) {
return (char)a;
} else if (a < 0xc0) {
throw new UTFDataFormatException(INVALID_BYTE);
} else if (a < 0xe0) {
final int b = input.read();
if (b == -1) {
throw new EOFException();
} else if ((b & 0xc0) != 0x80) {
throw new UTFDataFormatException(INVALID_BYTE);
}
return (a & 0x1f) << 6 | b & 0x3f;
} else if (a < 0xf0) {
final int b = input.read();
if (b == -1) {
throw new EOFException();
} else if ((b & 0xc0) != 0x80) {
throw new UTFDataFormatException(INVALID_BYTE);
}
final int c = input.read();
if (c == -1) {
throw new EOFException();
} else if ((c & 0xc0) != 0x80) {
throw new UTFDataFormatException(INVALID_BYTE);
}
return (a & 0x0f) << 12 | (b & 0x3f) << 6 | c & 0x3f;
} else {
throw new UTFDataFormatException(INVALID_BYTE);
}
}
}