nhttp_huffman (nhttp_lib v1.1.1)

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Static Huffman encoder/decoder for HPACK (RFC 7541 Appendix B).

This module implements the static Huffman table used by HPACK for HTTP/2 header compression. The code table gives the shortest codes to the ASCII characters that are common in HTTP header values.

Summary

Types

decode_error()

Functions

decode(Data)

Decode a complete Huffman-encoded binary. The input is a whole number of octets terminated by EOS padding (1-7 all-ones bits) to the byte boundary, as required by RFC 7541 Section 5.2. Returns {ok, Decoded}, or {error, invalid_huffman} if the encoding is invalid (a non-all-ones or over-long pad, or an invalid code).

encode(Data)

Encode a binary using the HPACK Huffman table.

Types

decode_error()

-type decode_error() :: invalid_huffman.

Functions

decode(Data)

-spec decode(Data :: binary()) -> {ok, Decoded :: binary()} | {error, decode_error()}.

Decode a complete Huffman-encoded binary. The input is a whole number of octets terminated by EOS padding (1-7 all-ones bits) to the byte boundary, as required by RFC 7541 Section 5.2. Returns {ok, Decoded}, or {error, invalid_huffman} if the encoding is invalid (a non-all-ones or over-long pad, or an invalid code).

encode(Data)

-spec encode(Data :: binary()) -> binary().

Encode a binary using the HPACK Huffman table.

The encoded binary is padded with EOS (all 1s) to the next byte boundary as required by RFC 7541 Section 5.2.