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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Incorrect working in systems with constant msgpack types headers","articleBody":"## Problem description\n\nLet's imagine that I have a system that accepts only numbers encoded in `UINT16`. \n\nUsing the API with automatic header selection, it is impossible to encode values from `0` to `2^8-1` in `UINT16` because `MessagePacker` will offer the types `UINT8`, `INT8`, `NEGFIXINT`, `POSFIXINT`. This will happen until the number exceeds the ranges `UINT8`, `INT8`, `NEGFIXINT`, `POSFIXINT`.\n\n## Suggestions for API improvements for statically typed systems\n\nI suggest introducing an API in which the client can choose the type of encoded header.\nFor example: \n```java\n    public MessagePacker packUINT(final short b, final MessageFormat type)\n        throws IOException\n    {\n        switch (type) {\n            case UINT8:\n                writeByteAndByte(UINT8, (byte) b);\n                break;\n            case UINT16:\n                writeByteAndShort(UINT16, b);\n                break;\n            case UINT32:\n                writeByteAndInt(UINT32, b);\n                break;\n            case UINT64:\n                writeByteAndLong(UINT64, b);\n                break;\n            default: \n                throw new MessagePackException(\"Cannot convert '\" + type + \"' to UINT family types.\");\n        }\n        return this;\n    }\n```\nHere, a method should be understood as a set of overloaded methods with `short`, `int`, `long`, `BigInteger` value arguments . Conversion based on narrowing casting\n\nA similar solution for `FLOAT32/64` types, `INT8,16,32,64` families.\nThe code has already been written, it remains to send a PR\n","author":{"url":"https://github.com/nickkkccc","@type":"Person","name":"nickkkccc"},"datePublished":"2025-01-27T20:11:17.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/870/msgpack-java/issues/870"}