Cobhan FFI is a system for enabling shared code to be written in Rust and consumed from all major languages/platforms in a safe and effective way, using easy helper functions to manage any unsafe data marshaling.
- Supported types
- i32 - 32bit signed integer
- i64 - 64bit signed integer
- f64 - double precision 64bit IEEE 754 floating point
- Cobhan buffer - length delimited 8bit buffer (no null delimiters)
- utf-8 encoded string
- JSON
- binary data
- Cobhan buffer details
- Callers provide the output buffer allocation and capacity
- Called functions can transparently return larger values via temporary files
- Modern tmpfs is entirely memory backed
- Return values
- Functions that return scalar values can return the value directly
- Functions can use special case and return maximum positive or maximum negative or zero values to represent error or overflow conditions
- Functions can allow scalar values to wrap
- Functions should document their overflow / underflow behavior
- Functions that return scalar values can return the value directly