Dictionaries

Attach identical raw dictionary bytes to encoder and decoder:

Encoder

var enc = brotli.Encoder.init(allocator, .{});
defer enc.deinit();
if (!enc.attachDictionary(dict_bytes)) return error.InvalidDictionary;
// must precede first compressStream

Decoder

var d = brotli.Decoder.init(allocator, .{});
defer d.deinit();
if (!d.attachDictionary(dict_bytes)) return error.InvalidDictionary;
// must precede first input byte

Notes

• Data is referenced, not copied — keep it alive.
• Max size: 16 MiB.
• Streams produced with a dict cannot be decoded without it.
• The RFC 7932 static dictionary is built in on both sides automatically.

Full walkthrough: Dictionary Compression.