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package com.jclark.xml.tok;
/**
* An <CODE>Encoding</CODE> for an arbitrary encoding
* that represents every character by exactly one byte.
*
* @version $Revision: 1.2 $ $Date: 1998/02/17 04:51:04 $
*/
final class SingleByteEncoding extends Encoding {
private final byte[] byteTypeTable = new byte[256];
private final int[] asciiToByte = new int[128];
private final String map;
SingleByteEncoding(String map) {
super(1);
this.map = map;
for (int i = 0; i < 256; i++)
asciiToByte[i] = 0xFF;
for (int i = 0; i < 256; i++) {
char c = map.charAt(i);
if (c != 0xFFFD) {
byteTypeTable[i] = charTypeTable[c >> 8][c & 0xFF];
if (c < 128)
asciiToByte[c] = (byte)i;
}
else
byteTypeTable[i] = (byte) BT_MALFORM;
}
}
int byteType(byte[] buf, int off) {
return byteTypeTable[buf[off] & 0xFF];
}
int byteToAscii(byte[] buf, int off) {
return map.charAt(off);
}
// c is a significant ASCII character
boolean charMatches(byte[] buf, int off, char c) {
return asciiToByte[c] == buf[off];
}
public int convert(byte[] sourceBuf, int sourceStart, int sourceEnd,
char[] targetBuf, int targetStart) {
int initTargetStart = targetStart;
int c;
while (sourceStart != sourceEnd)
targetBuf[targetStart++] = map.charAt(sourceBuf[sourceStart++] & 0xFF);
return targetStart - initTargetStart;
}
public int getFixedBytesPerChar() {
return 1;
}
public void movePosition(final byte[] buf, int off, int end, Position pos) {
/* Maintain the invariant: off - colStart == colNumber. */
int colStart = off - pos.columnNumber;
int lineNumber = pos.lineNumber;
while (off != end) {
switch (byteTypeTable[buf[off++] & 0xFF]) {
case BT_CR:
lineNumber += 1;
colStart = off;
break;
case BT_LF:
lineNumber += 1;
if (off != end && buf[off] == asciiToByte['\n'])
off++;
colStart = off;
break;
}
}
pos.columnNumber = off - colStart;
pos.lineNumber = lineNumber;
}
int extendData(final byte[] buf, int off, final int end) {
while (off != end && byteTypeTable[buf[off] & 0xFF] >= 0)
off++;
return off;
}
}
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