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/*
* Copyright (C) 2010 The Android Open Source Project
*
* 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 libcore.util;
/**
* Various special-case charset conversions (for performance).
*
* @hide internal use only
*/
public final class CharsetUtils {
/**
* Returns a new byte array containing the bytes corresponding to the characters in the given
* string, encoded in US-ASCII. Unrepresentable characters are replaced by (byte) '?'.
*/
public static native byte[] toAsciiBytes(String s, int offset, int length);
/**
* Returns a new byte array containing the bytes corresponding to the characters in the given
* string, encoded in ISO-8859-1. Unrepresentable characters are replaced by (byte) '?'.
*/
public static native byte[] toIsoLatin1Bytes(String s, int offset, int length);
/**
* Returns a new byte array containing the bytes corresponding to the characters in the given
* string, encoded in UTF-8. All characters are representable in UTF-8.
*/
public static native byte[] toUtf8Bytes(String s, int offset, int length);
/**
* Returns a new byte array containing the bytes corresponding to the characters in the given
* string, encoded in UTF-16BE. All characters are representable in UTF-16BE.
*/
public static byte[] toBigEndianUtf16Bytes(String s, int offset, int length) {
byte[] result = new byte[length * 2];
int end = offset + length;
int resultIndex = 0;
for (int i = offset; i < end; ++i) {
char ch = s.charAt(i);
result[resultIndex++] = (byte) (ch >> 8);
result[resultIndex++] = (byte) ch;
}
return result;
}
/**
* Decodes the given US-ASCII bytes into the given char[]. Equivalent to but faster than:
*
* for (int i = 0; i < count; ++i) {
* char ch = (char) (data[start++] & 0xff);
* value[i] = (ch <= 0x7f) ? ch : REPLACEMENT_CHAR;
* }
*/
public static native void asciiBytesToChars(byte[] bytes, int offset, int length, char[] chars);
/**
* Decodes the given ISO-8859-1 bytes into the given char[]. Equivalent to but faster than:
*
* for (int i = 0; i < count; ++i) {
* value[i] = (char) (data[start++] & 0xff);
* }
*/
public static native void isoLatin1BytesToChars(byte[] bytes, int offset, int length, char[] chars);
private CharsetUtils() {
}
}
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