org.jcodings.specific.UTF16BEEncoding Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jcodings Show documentation
Show all versions of jcodings Show documentation
Byte based encoding support library for java
/*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.jcodings.specific;
import org.jcodings.Config;
import org.jcodings.IntHolder;
import org.jcodings.ascii.AsciiTables;
import org.jcodings.unicode.UnicodeEncoding;
public final class UTF16BEEncoding extends UnicodeEncoding {
protected UTF16BEEncoding() {
super("UTF-16BE", 2, 4, UTF16EncLen);
}
@Override
public int length(byte[]bytes, int p, int end) {
int b = bytes[p] & 0xff;
if (!isSurrogate(b)) {
return end - p >= 2 ? 2 : missing(1);
}
if (isSurrogateFirst(b)) {
switch (end - p) {
case 1: return missing(3);
case 2: return missing(2);
case 3: if (isSurrogateSecond(bytes[p + 2] & 0xff)) return missing(1);
default: if (isSurrogateSecond(bytes[p + 2] & 0xff)) return 4;
}
}
return CHAR_INVALID;
}
@Override
public boolean isNewLine(byte[]bytes, int p, int end) {
if (p + 1 < end) {
if (bytes[p + 1] == (byte)0x0a && bytes[p] == (byte)0x00) return true;
if (Config.USE_UNICODE_ALL_LINE_TERMINATORS) {
if ((!Config.USE_CRNL_AS_LINE_TERMINATOR && bytes[p+1] == (byte)0x0d) ||
bytes[p+1] == (byte)0x85 && bytes[p] == (byte)0x00) return true;
if (bytes[p] == (byte)0x20 && (bytes[p+1] == (byte)0x29 || bytes[p+1] == (byte)0x28)) return true;
}
}
return false;
}
@Override
public int mbcToCode(byte[]bytes, int p, int end) {
final int code;
if (isSurrogateFirst(bytes[p] & 0xff)) {
code = (((((bytes[p + 0] & 0xff) << 8) + (bytes[p + 1] & 0xff)) & 0x03ff) << 10) +
((((bytes[p + 2] & 0xff) << 8) + (bytes[p + 3] & 0xff)) & 0x03ff) + 0x10000;
} else {
code = (bytes[p + 0] & 0xff) * 256 + (bytes[p + 1] & 0xff);
}
return code;
}
@Override
public int codeToMbcLength(int code) {
return code > 0xffff ? 4 : 2;
}
@Override
public int codeToMbc(int code, byte[]bytes, int p) {
int p_ = p;
if (code > 0xffff) {
int high = (code >>> 10) + 0xd7c0;
int low = (code & 0x3ff) + 0xdc00;
bytes[p_++] = (byte)((high >>> 8) & 0xff);
bytes[p_++] = (byte)(high & 0xff);
bytes[p_++] = (byte)((low >>> 8) & 0xff);
bytes[p_] = (byte)(low & 0xff);
return 4;
} else {
bytes[p_++] = (byte)((code & 0xff00) >>> 8);
bytes[p_++] = (byte)(code & 0xff);
return 2;
}
}
@Override
public int mbcCaseFold(int flag, byte[]bytes, IntHolder pp, int end, byte[]fold) {
int p = pp.value;
int foldP = 0;
if (isAscii(bytes[p+1] & 0xff) && bytes[p] == 0) {
p++;
if (Config.USE_UNICODE_CASE_FOLD_TURKISH_AZERI) {
if ((flag & Config.CASE_FOLD_TURKISH_AZERI) != 0) {
if (bytes[p] == (byte)0x49) {
fold[foldP++] = (byte)0x01;
fold[foldP] = (byte)0x31;
pp.value += 2;
return 2;
}
}
} // USE_UNICODE_CASE_FOLD_TURKISH_AZERI
fold[foldP++] = 0;
fold[foldP] = AsciiTables.ToLowerCaseTable[bytes[p] & 0xff];
pp.value += 2;
return 2;
} else {
return super.mbcCaseFold(flag, bytes, pp, end, fold);
}
}
/** onigenc_utf16_32_get_ctype_code_range
*/
@Override
public int[]ctypeCodeRange(int ctype, IntHolder sbOut) {
sbOut.value = 0x00;
return super.ctypeCodeRange(ctype);
}
@Override
public int leftAdjustCharHead(byte[]bytes, int p, int s, int end) {
if (s <= p) return s;
if ((s - p) % 2 == 1) s--;
if (isSurrogateSecond(bytes[s] & 0xff) && s > p + 1) s -= 2;
return s;
}
@Override
public boolean isReverseMatchAllowed(byte[]bytes, int p, int end) {
return false;
}
static final int UTF16EncLen[] = {
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 4, 4, 4, 4, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2
};
private static boolean isSurrogateFirst(int c) {
return (c & 0xfc) == 0xd8;
}
private static boolean isSurrogateSecond(int c) {
return (c & 0xfc) == 0xdc;
}
private static boolean isSurrogate(int c) {
return (c & 0xf8) == 0xd8;
}
public static final UTF16BEEncoding INSTANCE = new UTF16BEEncoding();
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy