Module codec 

Minimal SCALE codec for the Polkadot app host-api wire format.

Implements only the primitives used by the protocol: compact integers, strings, bytes, enums (u8 tag), options, results, vectors.

Structs

Reader

Enums

DecodeErr

Functions

encode_compact_u32

SCALE compact integer encode (u32 range).

encode_option_none

Option::None = [0x00].

encode_option_some

Option::Some prefix = [0x01], then caller writes the value.

encode_result_err

Result::Err with inner error.

encode_result_ok

Result::Ok with inner value.

encode_result_ok_void

Result::Ok(void) = [0x00].

encode_string

SCALE string: compact length + UTF-8 bytes.

encode_tag

Enum tag (u8).

encode_var_bytes

Dynamic-length bytes: compact length + raw bytes.

encode_vector_len

Vector: compact count + items (caller encodes each item).