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/* Copyright (C) 2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <string.h>
#include "libdnssec/shared/bignum.h"
static void skip_leading_zeroes(dnssec_binary_t *value)
{
while (value->size > 0 && value->data[0] == 0) {
value->data += 1;
value->size -= 1;
}
}
size_t bignum_size_u(const dnssec_binary_t *_value)
{
dnssec_binary_t value = *_value;
skip_leading_zeroes(&value);
if (value.size == 0) {
return value.size + 1;
} else {
return value.size;
}
}
size_t bignum_size_s(const dnssec_binary_t *_value)
{
dnssec_binary_t value = *_value;
skip_leading_zeroes(&value);
if (value.size == 0 || value.data[0] & 0x80) {
return value.size + 1;
} else {
return value.size;
}
}
void bignum_write(wire_ctx_t *ctx, size_t width, const dnssec_binary_t *_value)
{
dnssec_binary_t value = *_value;
skip_leading_zeroes(&value);
size_t padding_len = width - value.size;
if (padding_len > 0) {
wire_ctx_clear(ctx, padding_len);
}
wire_ctx_write(ctx, value.data, value.size);
}
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