// protected int[] readExtIndexes(int skip) throws IOException
protected ByteBuffer readExtIndexes(int skip) throws IOException, InvalidFormatException {
ICUBinary.skipBytes(byteBuffer, skip);
ByteBuffer b = ICUBinary.sliceWithOrder(byteBuffer);
int lengthOfIndexes = b.getInt(0);
if (lengthOfIndexes < 32) {
throw new InvalidFormatException();
}
int numBytesExtensionStructure = b.getInt(31 * 4);
b.limit(numBytesExtensionStructure);
ICUBinary.skipBytes(byteBuffer, numBytesExtensionStructure);
return b;
}
/**
* Protected constructor.
*
* @param bytes ICU conversion data file
* @exception IOException throw if data file fails authentication
*/
protected UConverterDataReader(ByteBuffer bytes) throws IOException {
// if(debug) System.out.println("Bytes in buffer " + bytes.remaining());
byteBuffer = bytes;
/*unicodeVersion = */ ICUBinary.readHeader(byteBuffer, DATA_FORMAT_ID, IS_ACCEPTABLE);
// if(debug) System.out.println("Bytes left in byteBuffer " + byteBuffer.remaining());
}
protected void readMBCSTable(MBCSHeader header, UConverterMBCSTable mbcsTable)
throws IOException {
IntBuffer intBuffer = byteBuffer.asIntBuffer();
mbcsTable.countStates = (byte) header.countStates;
mbcsTable.stateTable = new int[header.countStates][256];
int i;
for (i = 0; i < header.countStates; ++i) {
intBuffer.get(mbcsTable.stateTable[i]);
}
mbcsTable.countToUFallbacks = header.countToUFallbacks;
mbcsTable.toUFallbacks = new MBCSToUFallback[header.countToUFallbacks];
for (i = 0; i < header.countToUFallbacks; ++i) {
int offset = intBuffer.get();
int codePoint = intBuffer.get();
mbcsTable.toUFallbacks[i] = new MBCSToUFallback(offset, codePoint);
}
// Skip as many bytes as we have read from the IntBuffer.
int length = intBuffer.position() * 4;
ICUBinary.skipBytes(byteBuffer, length);
// Consider leaving some large arrays as CharBuffer/IntBuffer rather than
// reading them into Java arrays, to reduce initialization time and memory usage,
// at the cost of some performance.
// For example: unicodeCodeUnits, fromUnicodeTable, fromUnicodeInts.
// Take care not to modify the buffer contents for swaplfnl.
CharBuffer charBuffer = byteBuffer.asCharBuffer();
length = header.offsetFromUTable - header.offsetToUCodeUnits;
assert (length & 1) == 0;
mbcsTable.unicodeCodeUnits = new char[length / 2];
charBuffer.get(mbcsTable.unicodeCodeUnits);
// Skip as many bytes as we have read from the CharBuffer.
ICUBinary.skipBytes(byteBuffer, length);
length = header.offsetFromUBytes - header.offsetFromUTable;
assert (length & 1) == 0;
int fromUTableCharsLength;
if (mbcsTable.outputType == CharsetMBCS.MBCS_OUTPUT_1) {
// single-byte table stage1 + stage2
fromUTableCharsLength = length / 2;
} else if (mbcsTable.hasSupplementary()) {
// stage1 for Unicode limit 0x110000 >> 10
fromUTableCharsLength = 0x440;
} else {
// stage1 for BMP limit 0x10000 >> 10
fromUTableCharsLength = 0x40;
}
mbcsTable.fromUnicodeTable = new char[fromUTableCharsLength];
charBuffer.get(mbcsTable.fromUnicodeTable);
if (mbcsTable.outputType != CharsetMBCS.MBCS_OUTPUT_1) {
// Read both stage1 and stage2 together into an int[] array.
// Keeping the short stage1 in the array avoids offsetting at runtime.
// The stage1 part of this array will not be used.
assert (length & 3) == 0;
mbcsTable.fromUnicodeTableInts = new int[length / 4];
byteBuffer.asIntBuffer().get(mbcsTable.fromUnicodeTableInts);
}
// Skip as many bytes as are in stage1 + stage2.
ICUBinary.skipBytes(byteBuffer, length);
mbcsTable.fromUBytesLength = header.fromUBytesLength;
boolean noFromU = ((header.options & CharsetMBCS.MBCS_OPT_NO_FROM_U) != 0);
if (!noFromU) {
switch (mbcsTable.outputType) {
case CharsetMBCS.MBCS_OUTPUT_1:
case CharsetMBCS.MBCS_OUTPUT_2:
case CharsetMBCS.MBCS_OUTPUT_2_SISO:
case CharsetMBCS.MBCS_OUTPUT_3_EUC:
mbcsTable.fromUnicodeChars =
ICUBinary.getChars(byteBuffer, header.fromUBytesLength / 2, 0);
break;
case CharsetMBCS.MBCS_OUTPUT_3:
case CharsetMBCS.MBCS_OUTPUT_4_EUC:
mbcsTable.fromUnicodeBytes = new byte[header.fromUBytesLength];
byteBuffer.get(mbcsTable.fromUnicodeBytes);
break;
case CharsetMBCS.MBCS_OUTPUT_4:
mbcsTable.fromUnicodeInts = ICUBinary.getInts(byteBuffer, header.fromUBytesLength / 4, 0);
break;
default:
// Cannot occur, caller checked already.
assert false;
}
} else {
// Optional utf8Friendly mbcsIndex -- _MBCSHeader.version 4.3 (ICU 3.8) and higher.
// Needed for reconstituting omitted data.
mbcsTable.mbcsIndex = byteBuffer.asCharBuffer();
}
}