liblzma: Be less picky in lzma_alone_decoder().
commit9271a3eb0e022b23e8712154be851d0afe4c02e4
authorLasse Collin <lasse.collin@tukaani.org>
Fri, 5 Apr 2013 16:34:09 +0000 (5 19:34 +0300)
committerLasse Collin <lasse.collin@tukaani.org>
Fri, 5 Apr 2013 16:34:09 +0000 (5 19:34 +0300)
treeed205154174ad4f0d1e313b7ef7387a690844403
parent211b931cee58626c1d2e021810cb108cb5cbc10f
liblzma: Be less picky in lzma_alone_decoder().

To avoid false positives when detecting .lzma files,
rare values in dictionary size and uncompressed size fields
were rejected. They will still be rejected if .lzma files
are decoded with lzma_auto_decoder(), but when using
lzma_alone_decoder() directly, such files will now be accepted.
Hopefully this is an OK compromise.

This doesn't affect xz because xz still has its own file
format detection code. This does affect lzmadec though.
So after this commit lzmadec will accept files that xz or
xz-emulating-lzma doesn't.

NOTE: lzma_alone_decoder() still won't decode all .lzma files
because liblzma's LZMA decoder doesn't support lc + lp > 4.

Reported here:
http://sourceforge.net/projects/lzmautils/forums/forum/708858/topic/7068827

Conflicts:
src/liblzma/common/alone_decoder.c
src/liblzma/common/alone_decoder.h
src/liblzma/common/alone_decoder.c
src/liblzma/common/alone_decoder.h
src/liblzma/common/auto_decoder.c