blob: 066f1d18903f612ee2480a8c1545c305b39f18f7 [file] [log] [blame]
// Copyright 2018 Brian Smith.
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
use super::{der::*, writer::*, *};
pub(crate) fn write_positive_integer(output: &mut Accumulator, value: &Positive) {
let first_byte = value.first_byte();
let value = value.big_endian_without_leading_zero();
write_tlv(output, Tag::Integer, |output| {
if (first_byte & 0x80) != 0 {
output.write_byte(0); // Disambiguate negative number.
}
write_copy(output, value)
})
}
pub(crate) fn write_all(tag: Tag, write_value: &Fn(&mut Accumulator)) -> Box<[u8]> {
let length = {
let mut length = LengthMeasurement::zero();
write_tlv(&mut length, tag, write_value);
length
};
let mut output = Writer::with_capacity(length);
write_tlv(&mut output, tag, write_value);
output.into()
}
fn write_tlv<F>(output: &mut Accumulator, tag: Tag, write_value: F)
where
F: Fn(&mut Accumulator),
{
let length: usize = {
let mut length = LengthMeasurement::zero();
write_value(&mut length);
length.into()
};
output.write_byte(tag as u8);
if length < 0x80 {
output.write_byte(length as u8);
} else if length < 0x1_00 {
output.write_byte(0x81);
output.write_byte(length as u8);
} else if length < 0x1_00_00 {
output.write_byte(0x82);
output.write_byte((length / 0x1_00) as u8);
output.write_byte(length as u8);
} else {
unreachable!();
};
write_value(output);
}