How to set dictSize on lzma2_decompress about lzma-rs HOT 7 OPEN

The LZMA format contains a header which specifies the dictionary size to use: https://github.com/gendx/lzma-rs/blob/master/src/decode/lzma.rs#L46

So lzma-rs just follows whatever dictionary size is written in the compressed stream, there is currently no way to override this value, nor to set limits on it.

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Some formats specify the properties in a different format. It would be awesome to have the "raw" function with everything as a parameter instead.

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Do you have a reference to the code and documentation for such "some formats"? Otherwise it's hard to add the feature you wish. Feel free to send a pull-request as well (with supporting references, example files, etc.).

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xz for java: https://tukaani.org/xz/java.html
see LZMAInputStream , LZMA2InputStream
@gendx

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I am working on porting libchdr to Rust, which directly interfaces with the LZMA SDK and sets the dictSize and other LZMA params explicitly.

My current solution is to vendor lzma-rs to expose the required options in Stream.

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I assume this issue is the same feature request as #72?

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#74 covers this for LZMA1, but I'm not sure how the current design of the LZMA2 decoder can take a useful dict_size parameter.

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