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zlib: add dictionary support to zstdCompress and zstdDecompress

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Adds optional dictionary support to zlib’s zstdCompress and
zstdDecompress APIs. This enables better compression ratios when the
dictionary matches expected input structure or content patterns.

The implementation allows passing a `dictionary` buffer through the
options object. Support was added to both streaming and convenience
methods. Tests and documentation were also updated to reflect this new
capability.

Fixes: https://github.com/nodejs/node/issues/59105
PR-URL: https://github.com/nodejs/node/pull/59240
Reviewed-By: Anna Henningsen <anna@addaleax.net>
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lluisemper 2025-08-04 18:13:57 +02:00 • committed by GitHub
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@ -1069,6 +1069,9 @@ Each Zstd-based class takes an `options` object. All options are optional.
* `maxOutputLength` {integer} Limits output size when using
[convenience methods][]. **Default:** [`buffer.kMaxLength`][]
* `info` {boolean} If `true`, returns an object with `buffer` and `engine`. **Default:** `false`
* `dictionary` {Buffer} Optional dictionary used to
improve compression efficiency when compressing or decompressing data that
shares common patterns with the dictionary.
For example: