Enum h2::hpack::decoder::Representation

enum Representation {
    Indexed,
    LiteralWithIndexing,
    LiteralWithoutIndexing,
    LiteralNeverIndexed,
    SizeUpdate,
}

Variants

Indexed

Indexed header field representation

An indexed header field representation identifies an entry in either the static table or the dynamic table (see Section 2.3).

Header encoding

  0   1   2   3   4   5   6   7
+---+---+---+---+---+---+---+---+
| 1 |        Index (7+)         |
+---+---------------------------+

LiteralWithIndexing

Literal Header Field with Incremental Indexing

A literal header field with incremental indexing representation results in appending a header field to the decoded header list and inserting it as a new entry into the dynamic table.

Header encoding

  0   1   2   3   4   5   6   7
+---+---+---+---+---+---+---+---+
| 0 | 1 |      Index (6+)       |
+---+---+-----------------------+
| H |     Value Length (7+)     |
+---+---------------------------+
| Value String (Length octets)  |
+-------------------------------+

LiteralWithoutIndexing

Literal Header Field without Indexing

A literal header field without indexing representation results in appending a header field to the decoded header list without altering the dynamic table.

Header encoding

  0   1   2   3   4   5   6   7
+---+---+---+---+---+---+---+---+
| 0 | 0 | 0 | 0 |  Index (4+)   |
+---+---+-----------------------+
| H |     Value Length (7+)     |
+---+---------------------------+
| Value String (Length octets)  |
+-------------------------------+

LiteralNeverIndexed

Literal Header Field Never Indexed

A literal header field never-indexed representation results in appending a header field to the decoded header list without altering the dynamic table. Intermediaries MUST use the same representation for encoding this header field.

  0   1   2   3   4   5   6   7
+---+---+---+---+---+---+---+---+
| 0 | 0 | 0 | 1 |  Index (4+)   |
+---+---+-----------------------+
| H |     Value Length (7+)     |
+---+---------------------------+
| Value String (Length octets)  |
+-------------------------------+

SizeUpdate

Dynamic Table Size Update

A dynamic table size update signals a change to the size of the dynamic table.

Header encoding

  0   1   2   3   4   5   6   7
+---+---+---+---+---+---+---+---+
| 0 | 0 | 1 |   Max size (5+)   |
+---+---------------------------+

Implementations

impl Representation

pub fn load(byte: u8) -> Result<Representation, DecoderError>