LZWDecodeCompat(): fix potential index-out-of-bounds write. Fixes...
LZWDecodeCompat(): fix potential index-out-of-bounds write. Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2780 / CVE-2018-8905 The fix consists in using the similar code LZWDecode() to validate we don't write outside of the output buffer.
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