@Override
public boolean fill(final CharacterBuffer buffer, final Reader reader) throws IOException {
buffer.offset = 0;
final int read = reader.read(buffer.buffer);
if (read == -1) return false;
buffer.length = read;
return true;
}
@Override
public boolean fill(final CharacterBuffer buffer, final Reader reader) throws IOException {
final char[] charBuffer = buffer.buffer;
buffer.offset = 0;
charBuffer[0] = buffer.lastTrailingHighSurrogate;
final int offset = buffer.lastTrailingHighSurrogate == 0 ? 0 : 1;
buffer.lastTrailingHighSurrogate = 0;
final int read = reader.read(charBuffer, offset, charBuffer.length - offset);
if (read == -1) {
buffer.length = offset;
return offset != 0;
}
buffer.length = read + offset;
// special case if the read returns 0 and the lastTrailingHighSurrogate was set
if (buffer.length > 1 && Character.isHighSurrogate(charBuffer[buffer.length - 1])) {
buffer.lastTrailingHighSurrogate = charBuffer[--buffer.length];
}
return true;
}