| /* |
| * 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; |
| |
| import dalvik.annotation.optimization.FastNative; |
| |
| /** |
| * 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) '?'. |
| */ |
| @FastNative |
| 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) '?'. |
| */ |
| @FastNative |
| 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. |
| */ |
| @FastNative |
| 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; |
| * } |
| */ |
| @FastNative |
| public static native void asciiBytesToChars(byte[] bytes, int offset, int length, char[] chars); |
| |
| private CharsetUtils() { |
| } |
| } |