This happens because of the presumption i_ptr can be wound back 2 bytes. It
could, until this change in 2006:
2006-08-31: Stuart Caie <[email protected]>
* lzxd_decompress(): [...] the LZX decompression stream can
sometimes become
odd-aligned (after an uncompressed block) and the next 16 bit
fetch needs to be split across two input buffers
Since this point, it has been possible for READ_BYTES to add 16 bits to the
bit-buffer but only have consumed 1 byte of the byte buffer.
A fix has been committed to the libmspack repository.
Regards
Stuart
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