Function encode_diff 

pub fn encode_diff(doc: DocId, remove: &[Tok], add: &[Tok]) -> Vec<u8> 

Encodes a differential update into a byte vector.

The resulting byte vector is structured as follows:

• TAG_DIFF (1 byte)
• doc_id (variable-length u64)
• remove.len() (variable-length u64)
• remove tokens (a sequence of variable-length u64 values)
• add.len() (variable-length u64)
• add tokens (a sequence of variable-length u64 values)

Arguments

• doc - The document ID.
• remove - A slice of tokens to be removed from the document.
• add - A slice of tokens to be added to the document.

Returns

A Vec<u8> containing the encoded differential frame.