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strip_cbor_metadata

espresso_contract_deployer::proposals::verify

Function strip_cbor_metadata 

Source 
pub fn strip_cbor_metadata(code: &[u8]) -> (Vec<u8>, Option<SolcVersion>)
Expand description

Strip the trailing solc CBOR metadata tail.

The tail is <cbor body> <u16-BE body length>. Solc emits the "solc": <3-byte version> map entry last, so a genuine body ends with 64 "solc" 43 <ver>. The body length is bounded (51 bytes with the default ipfs entry); a larger claimed length is treated as code, not metadata, so an attacker cannot hide appended bytes under an oversized tail.

Without a valid tail the input is returned unchanged with None.