Module envelope 

The optional envelope that wraps a raw Graven message for disk or network.

Layout (little-endian):

offset  size  field
0       4     magic = "GRVN"
4       1     format_version = 1
5       1     flags = 0
6       2     reserved = 0
8       8     schema_id
16      4     payload_len
20      N     payload
20+N    4     crc32c of bytes [0, 20+N)

Structs

Envelope

A validated envelope borrowed from the input buffer.

Envelopes

Iterator returned by envelopes.

Constants

FORMAT_VERSION

The only envelope format version this crate reads and writes.

HEADER_LEN

Size of the fixed header preceding the payload.

MAGIC

The four magic bytes that start every envelope.

TRAILER_LEN

Size of the CRC32C trailer following the payload.

Functions

decode

Parses and validates the envelope at the start of buf.

encode

Appends an envelope around payload to out.

envelopes

Iterates over envelopes concatenated in buf (e.g. a batch from Builder::seal_envelope … take_frames, or an append-only file).

schema_id

FNV-1a 64-bit hash of a fully qualified type name, e.g. "bank.Transaction".