Question 1

How to use rust-brotli in a no-std Rust project?

Accepted Answer

Set up custom allocators using the provided macros like declare_stack_allocator_struct and define_allocator_memory_pool, then manage BrotliState manually, as shown in the README's no-stdlib example. This avoids syscalls but requires understanding of memory pools and decompression loops.

Question 2

rust-brotli vs zstd in Rust for compression?

Accepted Answer

rust-brotli is best for Brotli-specific compatibility and no-std environments, offering bitwise-identical output to the C version. zstd libraries in Rust might provide better speed or simplicity for general compression, but rust-brotli excels in scenarios requiring Brotli standard adherence or embedded use.

Question 3

How to compress a file with rust-brotli from command line?

Accepted Answer

Use the built-in C interface by running 'cd c && make' to build the CLI tool, then use commands like 'brotli -c input.txt > output.br'. Alternatively, integrate the Rust API with io::Read or io::Write abstractions for programmatic compression.

Question 4

Is rust-brotli faster than the original C brotli?

Accepted Answer

Performance is designed to match the C implementation closely, with multithreaded compression for speed improvements. However, benchmarks may vary based on setup; the focus is on safety and compatibility rather than outright speed gains.

Question 5

How to concatenate streams with rust-brotli?

Accepted Answer

Use appendable and catable stream parameters: for simple concatenation, apply -bare -appendable to the first file and -bare -catable to others, then append a final 0x03 byte. For size optimization, use the catbrotli tool with -appendable and -catable flags, as detailed in the stream concatenation section.

Question 6

Can I replace libbrotli.so with rust-brotli in C projects?

Accepted Answer

Yes, build the FFI library from the c directory to produce libbrotli.so, which is a drop-in replacement. However, ensure no ODR conflicts by managing the ffi-api flag, and note that custom allocators and parameters might require adjustment.

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