/*
* 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.unicode;
import org.jcodings.IntHolder;
import org.jcodings.util.Macros;
public abstract class FixedWidthUnicodeEncoding extends UnicodeEncoding {
protected final int shift;
protected FixedWidthUnicodeEncoding(String name, int width) {
super(name, width, width, null);
shift = log2(width);
}
@Override
public final int length(byte c) {
return minLength;
}
@Override
public int length(byte[] bytes, int p, int e) {
if (e < p) {
return Macros.CONSTRUCT_MBCLEN_INVALID();
} else if (e-p < 4) {
return Macros.CONSTRUCT_MBCLEN_NEEDMORE(4-e-p);
} else {
int c = mbcToCode(bytes, p, e);
if (!Macros.UNICODE_VALID_CODEPOINT_P(c)) {
return Macros.CONSTRUCT_MBCLEN_INVALID();
}
return Macros.CONSTRUCT_MBCLEN_CHARFOUND(4);
}
}
@Override
public final int strLength(byte[]bytes, int p, int end) {
return (end - p) >>> shift;
}
@Override
public final int strCodeAt(byte[]bytes, int p, int end, int index) {
return mbcToCode(bytes, p + (index << shift), end);
}
@Override
public final int codeToMbcLength(int code) {
return minLength;
}
onigenc_utf16_32_get_ctype_code_range
/** onigenc_utf16_32_get_ctype_code_range
*/
@Override
public final int[]ctypeCodeRange(int ctype, IntHolder sbOut) {
sbOut.value = 0x00;
return super.ctypeCodeRange(ctype);
}
@Override
public final int leftAdjustCharHead(byte[]bytes, int p, int s, int end) {
if (s <= p) return s;
return s - ((s - p) % maxLength);
}
@Override
public final boolean isReverseMatchAllowed(byte[]bytes, int p, int end) {
return false;
}
private static int log2(int n){
int log = 0;
while ((n >>>= 1) != 0) log++;
return log;
}
}