Zig 0.17.0-dev (Split by item)

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length

Encode a length.

Encoder.length

pub fn length(self: *Encoder, len: usize) !void

File

lib/std/crypto/codecs/asn1/der/Encoder.zig:102

Code

pub fn length(self: *Encoder, len: usize) !void {
    if (len < 128) return self.buffer.prependSlice(&.{@intCast(len)});
    const len32 = std.math.cast(u32, len) orelse return error.InvalidLength;
    var buf: [@sizeOf(u32) + 1]u8 = undefined;
    std.mem.writeInt(u32, buf[1..], len32, .big);
    var first: usize = 1;
    while (buf[first] == 0) first += 1;
    buf[first - 1] = @intCast((buf.len - first) | 0x80);
    return self.buffer.prependSlice(buf[first - 1 ..]);
}