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/*
* ngtcp2
*
* Copyright (c) 2017 ngtcp2 contributors
*
* 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 "ngtcp2_conv.h"
#include <string.h>
#include <assert.h>
#include "ngtcp2_str.h"
#include "ngtcp2_pkt.h"
#include "ngtcp2_net.h"
#include "ngtcp2_unreachable.h"
const uint8_t *ngtcp2_get_uint64(uint64_t *dest, const uint8_t *p) {
uint64_t n;
memcpy(&n, p, sizeof(n));
*dest = ngtcp2_ntohl64(n);
return p + sizeof(n);
}
const uint8_t *ngtcp2_get_uint48(uint64_t *dest, const uint8_t *p) {
uint64_t n = 0;
memcpy(((uint8_t *)&n) + 2, p, 6);
*dest = ngtcp2_ntohl64(n);
return p + 6;
}
const uint8_t *ngtcp2_get_uint32(uint32_t *dest, const uint8_t *p) {
uint32_t n;
memcpy(&n, p, sizeof(n));
*dest = ngtcp2_ntohl(n);
return p + sizeof(n);
}
const uint8_t *ngtcp2_get_uint24(uint32_t *dest, const uint8_t *p) {
uint32_t n = 0;
memcpy(((uint8_t *)&n) + 1, p, 3);
*dest = ngtcp2_ntohl(n);
return p + 3;
}
const uint8_t *ngtcp2_get_uint16(uint16_t *dest, const uint8_t *p) {
uint16_t n;
memcpy(&n, p, sizeof(n));
*dest = ngtcp2_ntohs(n);
return p + sizeof(n);
}
const uint8_t *ngtcp2_get_uint16be(uint16_t *dest, const uint8_t *p) {
memcpy(dest, p, sizeof(*dest));
return p + sizeof(*dest);
}
static uint64_t get_uvarint(size_t *plen, const uint8_t *p) {
union {
uint8_t n8;
uint16_t n16;
uint32_t n32;
uint64_t n64;
} n;
*plen = (size_t)(1u << (*p >> 6));
switch (*plen) {
case 1:
return *p;
case 2:
memcpy(&n, p, 2);
n.n8 &= 0x3f;
return ngtcp2_ntohs(n.n16);
case 4:
memcpy(&n, p, 4);
n.n8 &= 0x3f;
return ngtcp2_ntohl(n.n32);
case 8:
memcpy(&n, p, 8);
n.n8 &= 0x3f;
return ngtcp2_ntohl64(n.n64);
default:
ngtcp2_unreachable();
}
}
const uint8_t *ngtcp2_get_uvarint(uint64_t *dest, const uint8_t *p) {
size_t len;
*dest = get_uvarint(&len, p);
return p + len;
}
const uint8_t *ngtcp2_get_varint(int64_t *dest, const uint8_t *p) {
size_t len;
*dest = (int64_t)get_uvarint(&len, p);
return p + len;
}
int64_t ngtcp2_get_pkt_num(const uint8_t *p, size_t pkt_numlen) {
uint32_t l;
uint16_t s;
switch (pkt_numlen) {
case 1:
return *p;
case 2:
ngtcp2_get_uint16(&s, p);
return (int64_t)s;
case 3:
ngtcp2_get_uint24(&l, p);
return (int64_t)l;
case 4:
ngtcp2_get_uint32(&l, p);
return (int64_t)l;
default:
ngtcp2_unreachable();
}
}
uint8_t *ngtcp2_put_uint64be(uint8_t *p, uint64_t n) {
n = ngtcp2_htonl64(n);
return ngtcp2_cpymem(p, (const uint8_t *)&n, sizeof(n));
}
uint8_t *ngtcp2_put_uint48be(uint8_t *p, uint64_t n) {
n = ngtcp2_htonl64(n);
return ngtcp2_cpymem(p, ((const uint8_t *)&n) + 2, 6);
}
uint8_t *ngtcp2_put_uint32be(uint8_t *p, uint32_t n) {
n = ngtcp2_htonl(n);
return ngtcp2_cpymem(p, (const uint8_t *)&n, sizeof(n));
}
uint8_t *ngtcp2_put_uint24be(uint8_t *p, uint32_t n) {
n = ngtcp2_htonl(n);
return ngtcp2_cpymem(p, ((const uint8_t *)&n) + 1, 3);
}
uint8_t *ngtcp2_put_uint16be(uint8_t *p, uint16_t n) {
n = ngtcp2_htons(n);
return ngtcp2_cpymem(p, (const uint8_t *)&n, sizeof(n));
}
uint8_t *ngtcp2_put_uint16(uint8_t *p, uint16_t n) {
return ngtcp2_cpymem(p, (const uint8_t *)&n, sizeof(n));
}
uint8_t *ngtcp2_put_uvarint(uint8_t *p, uint64_t n) {
uint8_t *rv;
if (n < 64) {
*p++ = (uint8_t)n;
return p;
}
if (n < 16384) {
rv = ngtcp2_put_uint16be(p, (uint16_t)n);
*p |= 0x40;
return rv;
}
if (n < 1073741824) {
rv = ngtcp2_put_uint32be(p, (uint32_t)n);
*p |= 0x80;
return rv;
}
assert(n < 4611686018427387904ULL);
rv = ngtcp2_put_uint64be(p, n);
*p |= 0xc0;
return rv;
}
uint8_t *ngtcp2_put_uvarint30(uint8_t *p, uint32_t n) {
uint8_t *rv;
assert(n < 1073741824);
rv = ngtcp2_put_uint32be(p, n);
*p |= 0x80;
return rv;
}
uint8_t *ngtcp2_put_pkt_num(uint8_t *p, int64_t pkt_num, size_t len) {
switch (len) {
case 1:
*p++ = (uint8_t)pkt_num;
return p;
case 2:
ngtcp2_put_uint16be(p, (uint16_t)pkt_num);
return p + 2;
case 3:
ngtcp2_put_uint24be(p, (uint32_t)pkt_num);
return p + 3;
case 4:
ngtcp2_put_uint32be(p, (uint32_t)pkt_num);
return p + 4;
default:
ngtcp2_unreachable();
}
}
size_t ngtcp2_get_uvarintlen(const uint8_t *p) {
return (size_t)(1u << (*p >> 6));
}
size_t ngtcp2_put_uvarintlen(uint64_t n) {
if (n < 64) {
return 1;
}
if (n < 16384) {
return 2;
}
if (n < 1073741824) {
return 4;
}
assert(n < 4611686018427387904ULL);
return 8;
}
int64_t ngtcp2_nth_server_bidi_id(uint64_t n) {
if (n == 0) {
return 0;
}
if ((NGTCP2_MAX_VARINT >> 2) < n - 1) {
return NGTCP2_MAX_SERVER_STREAM_ID_BIDI;
}
return (int64_t)(((n - 1) << 2) | 0x01);
}
int64_t ngtcp2_nth_client_bidi_id(uint64_t n) {
if (n == 0) {
return 0;
}
if ((NGTCP2_MAX_VARINT >> 2) < n - 1) {
return NGTCP2_MAX_CLIENT_STREAM_ID_BIDI;
}
return (int64_t)((n - 1) << 2);
}
int64_t ngtcp2_nth_server_uni_id(uint64_t n) {
if (n == 0) {
return 0;
}
if ((NGTCP2_MAX_VARINT >> 2) < n - 1) {
return NGTCP2_MAX_SERVER_STREAM_ID_UNI;
}
return (int64_t)(((n - 1) << 2) | 0x03);
}
int64_t ngtcp2_nth_client_uni_id(uint64_t n) {
if (n == 0) {
return 0;
}
if ((NGTCP2_MAX_VARINT >> 2) < n - 1) {
return NGTCP2_MAX_CLIENT_STREAM_ID_UNI;
}
return (int64_t)(((n - 1) << 2) | 0x02);
}
uint64_t ngtcp2_ord_stream_id(int64_t stream_id) {
return (uint64_t)(stream_id >> 2) + 1;
}
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