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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_str.h"
#include <string.h>
#include "ngtcp2_macro.h"
void *ngtcp2_cpymem(void *dest, const void *src, size_t n) {
memcpy(dest, src, n);
return (uint8_t *)dest + n;
}
uint8_t *ngtcp2_setmem(uint8_t *dest, uint8_t b, size_t n) {
memset(dest, b, n);
return dest + n;
}
const void *ngtcp2_get_bytes(void *dest, const void *src, size_t n) {
memcpy(dest, src, n);
return (uint8_t *)src + n;
}
#define LOWER_XDIGITS "0123456789abcdef"
uint8_t *ngtcp2_encode_hex(uint8_t *dest, const uint8_t *data, size_t len) {
size_t i;
uint8_t *p = dest;
for (i = 0; i < len; ++i) {
*p++ = (uint8_t)LOWER_XDIGITS[data[i] >> 4];
*p++ = (uint8_t)LOWER_XDIGITS[data[i] & 0xf];
}
*p = '\0';
return dest;
}
char *ngtcp2_encode_printable_ascii(char *dest, const uint8_t *data,
size_t len) {
size_t i;
char *p = dest;
uint8_t c;
for (i = 0; i < len; ++i) {
c = data[i];
if (0x20 <= c && c <= 0x7e) {
*p++ = (char)c;
} else {
*p++ = '.';
}
}
*p = '\0';
return dest;
}
/*
* write_uint writes |n| to the buffer pointed by |p| in decimal
* representation. It returns |p| plus the number of bytes written.
* The function assumes that the buffer has enough capacity to contain
* a string.
*/
static uint8_t *write_uint(uint8_t *p, uint64_t n) {
size_t nlen = 0;
uint64_t t;
uint8_t *res;
if (n == 0) {
*p++ = '0';
return p;
}
for (t = n; t; t /= 10, ++nlen)
;
p += nlen;
res = p;
for (; n; n /= 10) {
*--p = (uint8_t)((n % 10) + '0');
}
return res;
}
uint8_t *ngtcp2_encode_ipv4(uint8_t *dest, const uint8_t *addr) {
size_t i;
uint8_t *p = dest;
p = write_uint(p, addr[0]);
for (i = 1; i < 4; ++i) {
*p++ = '.';
p = write_uint(p, addr[i]);
}
*p = '\0';
return dest;
}
/*
* write_hex_zsup writes the content of buffer pointed by |data| of
* length |len| to |dest| in hex string. Any leading zeros are
* suppressed. It returns |dest| plus the number of bytes written.
*/
static uint8_t *write_hex_zsup(uint8_t *dest, const uint8_t *data, size_t len) {
size_t i;
uint8_t *p = dest;
uint8_t d;
for (i = 0; i < len; ++i) {
d = data[i];
if (d >> 4) {
break;
}
d &= 0xf;
if (d) {
*p++ = (uint8_t)LOWER_XDIGITS[d];
++i;
break;
}
}
if (p == dest && i == len) {
*p++ = '0';
return p;
}
for (; i < len; ++i) {
d = data[i];
*p++ = (uint8_t)LOWER_XDIGITS[d >> 4];
*p++ = (uint8_t)LOWER_XDIGITS[d & 0xf];
}
return p;
}
uint8_t *ngtcp2_encode_ipv6(uint8_t *dest, const uint8_t *addr) {
uint16_t blks[8];
size_t i;
size_t zlen, zoff;
size_t max_zlen = 0, max_zoff = 8;
uint8_t *p = dest;
for (i = 0; i < 16; i += sizeof(uint16_t)) {
/* Copy in network byte order. */
memcpy(&blks[i / sizeof(uint16_t)], addr + i, sizeof(uint16_t));
}
for (i = 0; i < 8;) {
if (blks[i]) {
++i;
continue;
}
zlen = 1;
zoff = i;
++i;
for (; i < 8 && blks[i] == 0; ++i, ++zlen)
;
if (zlen > max_zlen) {
max_zlen = zlen;
max_zoff = zoff;
}
}
/* Do not suppress a single '0' block */
if (max_zlen == 1) {
max_zoff = 8;
}
if (max_zoff != 0) {
p = write_hex_zsup(p, (const uint8_t *)blks, sizeof(uint16_t));
for (i = 1; i < max_zoff; ++i) {
*p++ = ':';
p = write_hex_zsup(p, (const uint8_t *)(blks + i), sizeof(uint16_t));
}
}
if (max_zoff != 8) {
*p++ = ':';
if (max_zoff + max_zlen == 8) {
*p++ = ':';
} else {
for (i = max_zoff + max_zlen; i < 8; ++i) {
*p++ = ':';
p = write_hex_zsup(p, (const uint8_t *)(blks + i), sizeof(uint16_t));
}
}
}
*p = '\0';
return dest;
}
int ngtcp2_cmemeq(const uint8_t *a, const uint8_t *b, size_t n) {
size_t i;
int rv = 0;
for (i = 0; i < n; ++i) {
rv |= a[i] ^ b[i];
}
return rv == 0;
}
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