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add readme for runtime abi
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lib/runtime-abi/README.md
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# runtime-abi
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This crate has ABI functions (like syscalls) and extensions to the runtime for enabling ABIs (e.g. virtual filesystem).
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## Virtual Filesystem (experimental)
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The virtual filesystem allows the runtime to read bundled wasm data as if they were files. Data that is stored in a
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custom section compressed with [zstd][1] compression and archived with [tar][2] will be exposed as files and mounted
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in the `/` root.
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The only current supported operation is the `read` syscall.
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The virtual filesystem is not enabled by default. Build with `--features vfs` to use it.
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[1]: https://facebook.github.io/zstd/
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[2]: https://www.gnu.org/software/tar/
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