Function writePackedInt [src]

Stores an integer to packed memory. Asserts that buffer contains at least bit_offset + @bitSizeOf(T) bits.

Prototype

pub fn writePackedInt(comptime T: type, bytes: []u8, bit_offset: usize, value: T, endian: Endian) void

Parameters

T: typebytes: []u8bit_offset: usizevalue: Tendian: Endian

Example

 test writePackedInt {
    const T = packed struct(u16) { a: u3, b: u7, c: u6 };
    var st = T{ .a = 1, .b = 2, .c = 4 };
    writePackedInt(u7, std.mem.asBytes(&st), @bitOffsetOf(T, "b"), 0x7f, builtin.cpu.arch.endian());
    try std.testing.expectEqual(T{ .a = 1, .b = 0x7f, .c = 4 }, st);
}

Source

  pub fn writePackedInt(comptime T: type, bytes: []u8, bit_offset: usize, value: T, endian: Endian) void {
    switch (endian) {
        .little => writePackedIntLittle(T, bytes, bit_offset, value),
        .big => writePackedIntBig(T, bytes, bit_offset, value),
    }
}  