msgpack-zig

msgpack-zig provides a simple API for encoding and decoding msgpack data. The API is designed to similar to std.json. Msgpack inherently requires less allocation than JSON so the return values are slightly different.

Important

msgpack-zig uses zig 0.13.0

Usage

Note

Refer to the documentation for additional usage.

There are two main functions provided by msgpack-zig:

/// Pack a given type as a msgpack Value
pub fn pack(comptime T: type, writer: std.io.AnyWriter) anyerror!void {}

/// Unpack the next msgpack Value from reader as type T
pub fn unpack(comptime T: type, reader: std.io.AnyReader) anyerror!void {}

For packing, any type which has a function signature msgpackPack(self: T, writer: std.io.AnyWriter) anyerror!void will use this function has for packing. Otherwise it will be packed using the defaults.

Likewise, unpacking types can implement msgpackUnpack(writer: std.io.AnyWriter) anyerror!T to unpack from a stream, or msgpackUnpackFromValue(value: msgpack.Value) anyerror!T to unpack from a msgpack.Value.

Value

msgpack values are stored internally as a tagged union. Note that we impose a limitation on maps: the keys must be strings, similar to JSON (the msgpack specification allows for any msgpack type to be a key).

pub const Value = union(enum) {
    i64: i64,
    u64: u64,
    f64: f64,
    nil: void,
    bool: bool,
    str: []const u8,
    bin: []const u8,
    array: []Value,
    map: std.StringHashMap(Value),
    ext: struct {
        id: i8,
        data: []const u8,
    },
};

Roadmap

• Automatic unpacking of map to structs