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package com.jclark.xml.tok;
/**
* An <CODE>Encoding</CODE> for UTF-8.
* @version $Revision: 1.5 $ $Date: 1998/05/27 05:43:15 $
*/
final class UTF8Encoding extends Encoding {
private static final byte[] utf8HiTypeTable = {
/* 0x80 */ (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM,
/* 0x84 */ (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM,
/* 0x88 */ (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM,
/* 0x8C */ (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM,
/* 0x90 */ (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM,
/* 0x94 */ (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM,
/* 0x98 */ (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM,
/* 0x9C */ (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM,
/* 0xA0 */ (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM,
/* 0xA4 */ (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM,
/* 0xA8 */ (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM,
/* 0xAC */ (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM,
/* 0xB0 */ (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM,
/* 0xB4 */ (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM,
/* 0xB8 */ (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM,
/* 0xBC */ (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM, (byte) BT_MALFORM,
/* 0xC0 */ (byte) BT_LEAD2, (byte) BT_LEAD2, (byte) BT_LEAD2, (byte) BT_LEAD2,
/* 0xC4 */ (byte) BT_LEAD2, (byte) BT_LEAD2, (byte) BT_LEAD2, (byte) BT_LEAD2,
/* 0xC8 */ (byte) BT_LEAD2, (byte) BT_LEAD2, (byte) BT_LEAD2, (byte) BT_LEAD2,
/* 0xCC */ (byte) BT_LEAD2, (byte) BT_LEAD2, (byte) BT_LEAD2, (byte) BT_LEAD2,
/* 0xD0 */ (byte) BT_LEAD2, (byte) BT_LEAD2, (byte) BT_LEAD2, (byte) BT_LEAD2,
/* 0xD4 */ (byte) BT_LEAD2, (byte) BT_LEAD2, (byte) BT_LEAD2, (byte) BT_LEAD2,
/* 0xD8 */ (byte) BT_LEAD2, (byte) BT_LEAD2, (byte) BT_LEAD2, (byte) BT_LEAD2,
/* 0xDC */ (byte) BT_LEAD2, (byte) BT_LEAD2, (byte) BT_LEAD2, (byte) BT_LEAD2,
/* 0xE0 */ (byte) BT_LEAD3, (byte) BT_LEAD3, (byte) BT_LEAD3, (byte) BT_LEAD3,
/* 0xE4 */ (byte) BT_LEAD3, (byte) BT_LEAD3, (byte) BT_LEAD3, (byte) BT_LEAD3,
/* 0xE8 */ (byte) BT_LEAD3, (byte) BT_LEAD3, (byte) BT_LEAD3, (byte) BT_LEAD3,
/* 0xEC */ (byte) BT_LEAD3, (byte) BT_LEAD3, (byte) BT_LEAD3, (byte) BT_LEAD3,
/* 0xF0 */ (byte) BT_LEAD4, (byte) BT_LEAD4, (byte) BT_LEAD4, (byte) BT_LEAD4,
/* 0xF4 */ (byte) BT_LEAD4, (byte) BT_LEAD4, (byte) BT_LEAD4, (byte) BT_LEAD4,
/* 0xF8 */ (byte) BT_NONXML, (byte) BT_NONXML, (byte) BT_NONXML, (byte) BT_NONXML,
/* 0xFC */ (byte) BT_NONXML, (byte) BT_NONXML, (byte) BT_MALFORM, (byte) BT_MALFORM
};
private static final byte[] utf8TypeTable = new byte[256];
static {
System.arraycopy(asciiTypeTable, 0, utf8TypeTable, 0, 128);
System.arraycopy(utf8HiTypeTable, 0, utf8TypeTable, 128, 128);
}
UTF8Encoding() {
super(1);
}
int byteType(byte[] buf, int off) {
return utf8TypeTable[buf[off] & 0xFF];
}
int byteToAscii(byte[] buf, int off) {
return (char)buf[off];
}
// c is a significant ASCII character
boolean charMatches(byte[] buf, int off, char c) {
return (char)buf[off] == c;
}
/* A 2 byte UTF-8 representation splits the characters 11 bits
between the bottom 5 and 6 bits of the bytes. */
int byteType2(byte[] buf, int off) {
final byte[] page = charTypeTable[(buf[off] >>> 2) & 0x7];
return page[((buf[off] & 3) << 6) | (buf[off + 1] & 0x3F)];
}
/* A 3 byte UTF-8 representation splits the characters 16 bits
between the bottom 4, 6 and 6 bits of the bytes. */
/* This will (incorrectly) return BT_LEAD4 for surrogates, but that
doesn't matter. */
int byteType3(byte[] buf, int off) {
final byte[] page = charTypeTable[((buf[off] & 0xF) << 4)
| ((buf[off + 1] >>> 2) & 0xF)];
return page[((buf[off + 1] & 3) << 6) | (buf[off + 2] & 0x3F)];
}
void check3(byte[] buf, int off) throws InvalidTokenException {
switch (buf[off]) {
case 0xEF - 0x100:
/* 0xFFFF 0xFFFE */
if (buf[off + 1] == (0xBF - 0x100)
&& (buf[off + 2] == (0xBF - 0x100)
|| buf[off + 2] == (0xBE - 0x100)))
break;
return;
case 0xED - 0x100:
/* 0xD800..0xDFFF <=> top 5 bits are 11011 */
if ((buf[off + 1] & 0x20) != 0)
break;
return;
default:
return;
}
throw new InvalidTokenException(off);
}
void check4(byte[] buf, int off) throws InvalidTokenException {
switch (buf[off] & 0x7) {
default:
return;
case 5: case 6: case 7:
break;
case 4:
if ((buf[off + 1] & 0x30) == 0)
return;
break;
}
throw new InvalidTokenException(off);
}
public int convert(byte[] sourceBuf, int sourceStart, int sourceEnd,
char[] targetBuf, int targetStart) {
int initTargetStart = targetStart;
int c;
while (sourceStart != sourceEnd) {
byte b = sourceBuf[sourceStart++];
if (b >= 0)
targetBuf[targetStart++] = (char)b;
else {
switch (utf8TypeTable[b & 0xFF]) {
case BT_LEAD2:
/* 5, 6 */
targetBuf[targetStart++]
= (char)(((b & 0x1F) << 6) | (sourceBuf[sourceStart++] & 0x3F));
break;
case BT_LEAD3:
/* 4, 6, 6 */
c = (b & 0xF) << 12;
c |= (sourceBuf[sourceStart++] & 0x3F) << 6;
c |= (sourceBuf[sourceStart++] & 0x3F);
targetBuf[targetStart++] = (char)c;
break;
case BT_LEAD4:
/* 3, 6, 6, 6 */
c = (b & 0x7) << 18;
c |= (sourceBuf[sourceStart++] & 0x3F) << 12;
c |= (sourceBuf[sourceStart++] & 0x3F) << 6;
c |= (sourceBuf[sourceStart++] & 0x3F);
c -= 0x10000;
targetBuf[targetStart++] = (char)((c >> 10) | 0xD800);
targetBuf[targetStart++] = (char)((c & ((1 << 10) - 1)) | 0xDC00);
break;
}
}
}
return targetStart - initTargetStart;
}
public int getFixedBytesPerChar() {
return 0;
}
public void movePosition(final byte[] buf, int off, int end, Position pos) {
/* Maintain the invariant: off - colDiff == colNumber. */
int colDiff = off - pos.columnNumber;
int lineNumber = pos.lineNumber;
while (off != end) {
byte b = buf[off];
if (b >= 0) {
++off;
switch (b) {
case (byte)'\n':
lineNumber += 1;
colDiff = off;
break;
case (byte)'\r':
lineNumber += 1;
if (off != end && buf[off] == '\n')
off++;
colDiff = off;
break;
}
}
else {
switch (utf8TypeTable[b & 0xFF]) {
default:
off += 1;
break;
case BT_LEAD2:
off += 2;
colDiff++;
break;
case BT_LEAD3:
off += 3;
colDiff += 2;
break;
case BT_LEAD4:
off += 4;
colDiff += 3;
break;
}
}
}
pos.columnNumber = off - colDiff;
pos.lineNumber = lineNumber;
}
int extendData(final byte[] buf, int off, final int end) throws InvalidTokenException {
while (off != end) {
int type = utf8TypeTable[buf[off] & 0xFF];
if (type >= 0)
off++;
else if (type < BT_LEAD4)
break;
else {
if (end - off + type < 0)
break;
switch (type) {
case BT_LEAD3:
check3(buf, off);
break;
case BT_LEAD4:
check4(buf, off);
break;
}
off -= type;
}
}
return off;
}
}
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