Function ReadByte

src/saveload/oldloader.cpp:86–113

* * Reads a byte from the buffer and decompress if needed * */

 *
 */
uint8_t ReadByte(LoadgameState &ls)
{
	/* Old savegames have a nice compression algorithm (RLE)
	which means that we have a chunk, which starts with a length
	byte. If that byte is negative, we have to repeat the next byte
	that many times ( + 1). Else, we need to read that amount of bytes.
	Works pretty well if you have many zeros behind each other */

	if (ls.chunk_size == 0) {
		/* Read new chunk */
		int8_t new_byte = ReadByteFromFile(ls);

		if (new_byte < 0) {
			/* Repeat next char for new_byte times */
			ls.decoding    = true;
			ls.decode_char = ReadByteFromFile(ls);
			ls.chunk_size  = -new_byte + 1;
		} else {
			ls.decoding    = false;
			ls.chunk_size  = new_byte + 1;
		}
	}

	ls.total_read++;
	ls.chunk_size--;

	return ls.decoding ? ls.decode_char : ReadByteFromFile(ls);
}

/**
 *