Source
pub fn update(d: *Self, b: []const u8) void {
var off: usize = 0;
// Partial buffer exists from previous update. Copy into buffer then hash.
if (d.buf_len != 0 and d.buf_len + b.len >= 64) {
off += 64 - d.buf_len;
@memcpy(d.buf[d.buf_len..][0..off], b[0..off]);
d.round(&d.buf);
d.buf_len = 0;
}
// Full middle blocks.
while (off + 64 <= b.len) : (off += 64) {
d.round(b[off..][0..64]);
}
// Copy any remainder for next pass.
const b_slice = b[off..];
@memcpy(d.buf[d.buf_len..][0..b_slice.len], b_slice);
d.buf_len += @as(u8, @intCast(b_slice.len));
// Md5 uses the bottom 64-bits for length padding
d.total_len +%= b.len;
}