Split binary format parsing into a shared crate about cargo-bloat HOT 6 CLOSED

I'm not sure I have time to do this. Especially to support it later. But if you like, you can simply copy-paste the current code to your library and I will happily switch to it, as long is it doesn't have many dependencies (proc-macros in particular).

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Great! I will have to audit and support some code anyway, so I don't mind doing the work. I'll let you know once I have something usable.

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I've split the parsers into a shared library https://github.com/Shnatsel/binfarce, made the ELF parsers more general and hardened them against untrusted input so that they don't over-allocate or panic.

The changes this entails for cargo-bloat can be seen here: https://github.com/RazrFalcon/cargo-bloat/compare/master...Shnatsel:shared-library?expand=1 (although it still has a bit of file format detection code, I'm going to drop that too)

I'm open to feedback. If you don't have any objections, I'll give the Mach-o and PE parsers a similar treatment and open a pull request against cargo-bloat. I'm happy to add you as an owner on the git repo and on crates.io.

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Yes, looking good.

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Mach-O is now converted too. I know section extraction works, but I couldn't test the full cargo-bloat workflow because I don't have a mac.

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The code looks pretty much complete to me now. I'll publish on crates.io and send a PR to cargo-bloat soon-ish.

I've refactored all 4 parsers, switched section extraction from allocations to iterators and callbacks, and fuzzed all 4 parsers. Removing allocations didn't affect the APIs used by cargo-bloat at all (symbol extraction still allocates).

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