Function fill [src]

Prototype

pub fn fill(self: *RomuTrio, buf: []u8) void

Parameters

self: *RomuTriobuf: []u8

Example

 test fill {
    // Unfortunately there does not seem to be an official test sequence.
    var r = RomuTrio.init(0);

    const seq = [_]u64{
        16294208416658607535,
        13964609475759908645,
        4703697494102998476,
        3425221541186733346,
        2285772463536419399,
        9454187757529463048,
        13695907680080547496,
        8328236714879408626,
        12323357569716880909,
        12375466223337721820,
    };

    for (seq) |s| {
        var buf0: [8]u8 = undefined;
        var buf1: [7]u8 = undefined;
        std.mem.writeInt(u64, &buf0, s, .little);
        r.fill(&buf1);
        try std.testing.expect(std.mem.eql(u8, buf0[0..7], buf1[0..]));
    }
}

Source

  pub fn fill(self: *RomuTrio, buf: []u8) void {
    var i: usize = 0;
    const aligned_len = buf.len - (buf.len & 7);

    // Complete 8 byte segments.
    while (i < aligned_len) : (i += 8) {
        var n = self.next();
        comptime var j: usize = 0;
        inline while (j < 8) : (j += 1) {
            buf[i + j] = @as(u8, @truncate(n));
            n >>= 8;
        }
    }

    // Remaining. (cuts the stream)
    if (i != buf.len) {
        var n = self.next();
        while (i < buf.len) : (i += 1) {
            buf[i] = @as(u8, @truncate(n));
            n >>= 8;
        }
    }
}  