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package com.jclark.xml.tok;
/**
* An <CODE>Encoding</CODE> for UTF-16 in little-endian byte order
* (least significant byte first).
* @version $Revision: 1.2 $ $Date: 1998/02/17 04:51:05 $
*/
class UTF16LittleEndianEncoding extends Encoding {
UTF16LittleEndianEncoding() {
super(2);
}
final int byteType(byte[] buf, int off) {
return charTypeTable[buf[off + 1] & 0xFF][buf[off] & 0xFF];
}
// c is a significant ASCII character
final boolean charMatches(byte[] buf, int off, char c) {
return buf[off + 1] == 0 && (char)buf[off] == c;
}
final int byteToAscii(byte[] buf, int off) {
return buf[off + 1] == 0 ? (char)buf[off] : -1;
}
public int convert(byte[] sourceBuf, int sourceStart, int sourceEnd,
char[] targetBuf, int targetStart) {
int origTargetStart = targetStart;
while (sourceStart != sourceEnd) {
int c = (sourceBuf[sourceStart++] & 0xFF);
c |= (sourceBuf[sourceStart++] & 0xFF) << 8;
targetBuf[targetStart++] = (char)c;
}
return targetStart - origTargetStart;
}
public int getFixedBytesPerChar() {
return 2;
}
public void movePosition(final byte[] buf, int off, int end, Position pos) {
int lineNumber = pos.lineNumber;
/* Maintain invariant: off - colStart = colNumber*2 */
int colStart = off - (pos.columnNumber << 1);
while (off != end) {
switch (buf[off++]) {
case (byte)'\n':
if (buf[off++] == 0) {
lineNumber++;
colStart = off;
}
break;
case (byte)'\r':
if (buf[off++] == 0) {
if (off != end && buf[off] == '\n' && buf[off + 1] == 0)
off += 2;
lineNumber++;
colStart = off;
}
break;
default:
off++;
break;
}
}
pos.lineNumber = lineNumber;
pos.columnNumber = (off - colStart) >> 1;
}
Encoding getUTF16Encoding() {
return this;
}
}
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