private int[] readLengths(
PngDecodingDataStream stream, int numLengths, PngHuffmanTable lengthsTable, int tableSize)
throws IOException {
int[] lengths = new int[tableSize];
for (int index = 0; index < numLengths; ) {
int value = lengthsTable.getNextValue(stream);
if (value < 16) {
// Literal value
lengths[index] = value;
index++;
} else if (value == 16) {
// Repeat the previous code 3-6 times.
int count = stream.getNextIdatBits(2) + 3;
for (int i = 0; i < count; i++) {
lengths[index] = lengths[index - 1];
index++;
}
} else if (value == 17) {
// Repeat 0 3-10 times.
int count = stream.getNextIdatBits(3) + 3;
for (int i = 0; i < count; i++) {
lengths[index] = 0;
index++;
}
} else if (value == 18) {
// Repeat 0 11-138 times.
int count = stream.getNextIdatBits(7) + 11;
for (int i = 0; i < count; i++) {
lengths[index] = 0;
index++;
}
} else {
stream.error();
}
}
return lengths;
}
int getNextDistanceValue(PngDecodingDataStream stream) throws IOException {
return distanceTable.getNextValue(stream);
}
int getNextLiteralValue(PngDecodingDataStream stream) throws IOException {
return literalTable.getNextValue(stream);
}