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/*
* nghttp3
*
* Copyright (c) 2019 nghttp3 contributors
* 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 "nghttp3_conv.h"
#include <string.h>
#include <assert.h>
#include "nghttp3_str.h"
#include "nghttp3_unreachable.h"
const uint8_t *nghttp3_get_varint(int64_t *dest, const uint8_t *p) {
union {
uint8_t n8;
uint16_t n16;
uint32_t n32;
uint64_t n64;
} n;
switch (*p >> 6) {
case 0:
*dest = *p++;
return p;
case 1:
memcpy(&n, p, 2);
n.n8 &= 0x3f;
*dest = ntohs(n.n16);
return p + 2;
case 2:
memcpy(&n, p, 4);
n.n8 &= 0x3f;
*dest = ntohl(n.n32);
return p + 4;
case 3:
memcpy(&n, p, 8);
n.n8 &= 0x3f;
*dest = (int64_t)nghttp3_ntohl64(n.n64);
return p + 8;
default:
nghttp3_unreachable();
}
}
int64_t nghttp3_get_varint_fb(const uint8_t *p) { return *p & 0x3f; }
size_t nghttp3_get_varintlen(const uint8_t *p) {
return (size_t)(1u << (*p >> 6));
}
uint8_t *nghttp3_put_uint64be(uint8_t *p, uint64_t n) {
n = nghttp3_htonl64(n);
return nghttp3_cpymem(p, (const uint8_t *)&n, sizeof(n));
}
uint8_t *nghttp3_put_uint32be(uint8_t *p, uint32_t n) {
n = htonl(n);
return nghttp3_cpymem(p, (const uint8_t *)&n, sizeof(n));
}
uint8_t *nghttp3_put_uint16be(uint8_t *p, uint16_t n) {
n = htons(n);
return nghttp3_cpymem(p, (const uint8_t *)&n, sizeof(n));
}
uint8_t *nghttp3_put_varint(uint8_t *p, int64_t n) {
uint8_t *rv;
if (n < 64) {
*p++ = (uint8_t)n;
return p;
}
if (n < 16384) {
rv = nghttp3_put_uint16be(p, (uint16_t)n);
*p |= 0x40;
return rv;
}
if (n < 1073741824) {
rv = nghttp3_put_uint32be(p, (uint32_t)n);
*p |= 0x80;
return rv;
}
assert(n < 4611686018427387904LL);
rv = nghttp3_put_uint64be(p, (uint64_t)n);
*p |= 0xc0;
return rv;
}
size_t nghttp3_put_varintlen(int64_t n) {
if (n < 64) {
return 1;
}
if (n < 16384) {
return 2;
}
if (n < 1073741824) {
return 4;
}
assert(n < 4611686018427387904LL);
return 8;
}
uint64_t nghttp3_ord_stream_id(int64_t stream_id) {
return (uint64_t)(stream_id >> 2) + 1;
}
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