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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Control offset from extension.","articleBody":"Hi. \nIt isn't issue but suggestion\\question.\n\nI want to have custom implementation of array container deserialization (without legth) (server optimization proposes).\nTo implement it i want to have 2 extensions (e.g. 120 - array start [, and 121 - array end ]).\nSo Can i implement something similar? Can i controll offset of main buffer from extension?\n\nExpectation example: \n\n```\nextensionCodec.register({\n  type: 121,\n  decode: (data: Uint8Array) =\u003e {\n    return {arrayEnd : true};\n  },\n});\nextensionCodec.register({\n  type: 120,\n  decode: (data: Uint8Array) =\u003e {\n    const arr = [];\n    while(true) {\n       let arrayElement = decode(data); // returns some obj with offset shift from main data buffer.\n       if(arrayElement?.arrayEnd) break;\n       arr.push(arrayElement);\n    } \n    return arr ;\n  },\n});\n```","author":{"url":"https://github.com/crazylexa","@type":"Person","name":"crazylexa"},"datePublished":"2025-03-27T09:08:40.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/273/msgpack-javascript/issues/273"}