public boolean consume(CodeReader code, OUTPUT output) {
int nextChar = code.peek();
while (nextChar != -1) {
boolean characterConsumed = false;
for (Channel<OUTPUT> channel : channels) {
if (channel.consume(code, output)) {
characterConsumed = true;
break;
}
}
if (!characterConsumed) {
if (LOG.isDebugEnabled() || failIfNoChannelToConsumeOneCharacter) {
String message =
"None of the channel has been able to handle character '"
+ (char) code.peek()
+ "' (decimal value "
+ code.peek()
+ ") at line "
+ code.getLinePosition()
+ ", column "
+ code.getColumnPosition();
if (failIfNoChannelToConsumeOneCharacter) {
throw new IllegalStateException(message);
}
LOG.debug(message);
}
code.pop();
}
nextChar = code.peek();
}
return true;
}
public byte[] lzwUncompress(byte[] input, int rowNumPixels) {
if (input == null || input.length == 0) return input;
byte[][] symbolTable = new byte[4096][1];
int bitsToRead = 9; // default
int nextSymbol = 258;
int code;
int oldCode = -1;
ByteBuffer out = java.nio.ByteBuffer.allocate(rowNumPixels);
CodeReader bb = new CodeReader(input);
while (true) {
code = bb.getCode(bitsToRead);
if (code == EOI_CODE || code == -1) break;
if (code == CLEAR_CODE) {
// initialize symbol table
for (int i = 0; i < 256; i++) {
symbolTable[i][0] = (byte) i;
}
nextSymbol = 258;
bitsToRead = 9;
code = bb.getCode(bitsToRead);
if (code == EOI_CODE || code == -1) break;
out.put(symbolTable[code]);
oldCode = code;
} else {
if (code < nextSymbol) {
out.put(symbolTable[code]);
ByteBuffer symbol = java.nio.ByteBuffer.allocate((symbolTable[oldCode].length + 1));
symbol.put(symbolTable[oldCode]);
symbol.put(symbolTable[code][0]);
symbolTable[nextSymbol] = symbol.array();
oldCode = code;
nextSymbol++;
} else {
int size = symbolTable[oldCode].length + 1;
ByteBuffer symbol = java.nio.ByteBuffer.allocate(size);
symbol.put(symbolTable[oldCode]);
symbol.put(symbolTable[oldCode][0]);
byte[] outString = symbol.array();
out.put(outString);
symbolTable[nextSymbol] = outString;
oldCode = code;
nextSymbol++;
}
if (nextSymbol == 511) {
bitsToRead = 10;
}
if (nextSymbol == 1023) {
bitsToRead = 11;
}
if (nextSymbol == 2047) {
bitsToRead = 12;
}
}
}
return out.array();
}
@Override
public boolean consume(CodeReader code, StringBuilder output) {
output.append((char) code.pop());
return true;
}
