tokmd-ffi-envelope

Stable JSON envelope parsing for tokmd bindings.

Problem

FFI callers need one deterministic way to unwrap tokmd_core::ffi::run_json responses and normalize errors.

What it gives you

• EnvelopeExtractError
• parse_envelope
• format_error_message
• extract_data
• extract_data_from_json
• extract_data_json

API / usage notes

• Success envelopes return the data payload when present.
• Success envelopes without data return the original envelope unchanged.
• Upstream failures normalize to the [code] message shape used by bindings.
• src/lib.rs is the exact contract for parsing and extraction behavior.

Go deeper

• Tutorial: tokmd README
• How-to: tokmd-core
• Reference: src/lib.rs
• Explanation: Architecture