Seemingly valid lzma files result in "Corrupted range coding"

[dragly]

Processing some files result in an

LZMAError("Corrupted range coding")

even though the file is decoded fine by unlzma from XZ utils.

It seems like the assumption that self.code should not equal self.range in RangeDecoder::get_bit might be wrong:

lzma-rs/src/decode/rangecoder.rs

Line 59 in 6447f0d

if self.code == self.range {

I have attached a file that reproduces the issue:

bad-random-data.tar.gz (ironically I had to compress it as a .tar.gz to be allowed to upload it to GitHub 🙂 )

You can verify that it is successfully converted by XZ Utils using

unlzma -k -f bad-random-data.lzma

I will create a PR with a suggested fix that simply drops the error and changes the definition of bit in that function.

Also, thanks for creating this library!