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/*
* Copyright (c) 2018 Thomas Pornin <pornin@bolet.org>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "inner.h"
/* see inner.h */
br_asn1_uint
br_asn1_uint_prepare(const void *xdata, size_t xlen)
{
const unsigned char *x;
br_asn1_uint t;
x = xdata;
while (xlen > 0 && *x == 0) {
x ++;
xlen --;
}
t.data = x;
t.len = xlen;
t.asn1len = xlen;
if (xlen == 0 || x[0] >= 0x80) {
t.asn1len ++;
}
return t;
}
/* see inner.h */
size_t
br_asn1_encode_length(void *dest, size_t len)
{
unsigned char *buf;
size_t z;
int i, j;
buf = dest;
if (len < 0x80) {
if (buf != NULL) {
*buf = len;
}
return 1;
}
i = 0;
for (z = len; z != 0; z >>= 8) {
i ++;
}
if (buf != NULL) {
*buf ++ = 0x80 + i;
for (j = i - 1; j >= 0; j --) {
*buf ++ = len >> (j << 3);
}
}
return i + 1;
}
/* see inner.h */
size_t
br_asn1_encode_uint(void *dest, br_asn1_uint pp)
{
unsigned char *buf;
size_t lenlen;
if (dest == NULL) {
return 1 + br_asn1_encode_length(NULL, pp.asn1len) + pp.asn1len;
}
buf = dest;
*buf ++ = 0x02;
lenlen = br_asn1_encode_length(buf, pp.asn1len);
buf += lenlen;
*buf = 0x00;
memcpy(buf + pp.asn1len - pp.len, pp.data, pp.len);
return 1 + lenlen + pp.asn1len;
}
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