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/*
*
* Copyright 2015-2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "src/core/ext/transport/chttp2/transport/timeout_encoding.h"
#include <stdio.h>
#include <string.h>
#include <grpc/support/port_platform.h>
#include "src/core/lib/support/string.h"
static int64_t round_up(int64_t x, int64_t divisor) {
return (x / divisor + (x % divisor != 0)) * divisor;
}
/* round an integer up to the next value with three significant figures */
static int64_t round_up_to_three_sig_figs(int64_t x) {
if (x < 1000) return x;
if (x < 10000) return round_up(x, 10);
if (x < 100000) return round_up(x, 100);
if (x < 1000000) return round_up(x, 1000);
if (x < 10000000) return round_up(x, 10000);
if (x < 100000000) return round_up(x, 100000);
if (x < 1000000000) return round_up(x, 1000000);
return round_up(x, 10000000);
}
/* encode our minimum viable timeout value */
static void enc_tiny(char *buffer) { memcpy(buffer, "1n", 3); }
static void enc_ext(char *buffer, int64_t value, char ext) {
int n = int64_ttoa(value, buffer);
buffer[n] = ext;
buffer[n + 1] = 0;
}
static void enc_seconds(char *buffer, int64_t sec) {
if (sec % 3600 == 0) {
enc_ext(buffer, sec / 3600, 'H');
} else if (sec % 60 == 0) {
enc_ext(buffer, sec / 60, 'M');
} else {
enc_ext(buffer, sec, 'S');
}
}
static void enc_nanos(char *buffer, int64_t x) {
x = round_up_to_three_sig_figs(x);
if (x < 100000) {
if (x % 1000 == 0) {
enc_ext(buffer, x / 1000, 'u');
} else {
enc_ext(buffer, x, 'n');
}
} else if (x < 100000000) {
if (x % 1000000 == 0) {
enc_ext(buffer, x / 1000000, 'm');
} else {
enc_ext(buffer, x / 1000, 'u');
}
} else if (x < 1000000000) {
enc_ext(buffer, x / 1000000, 'm');
} else {
/* note that this is only ever called with times of less than one second,
so if we reach here the time must have been rounded up to a whole second
(and no more) */
memcpy(buffer, "1S", 3);
}
}
static void enc_micros(char *buffer, int64_t x) {
x = round_up_to_three_sig_figs(x);
if (x < 100000) {
if (x % 1000 == 0) {
enc_ext(buffer, x / 1000, 'm');
} else {
enc_ext(buffer, x, 'u');
}
} else if (x < 100000000) {
if (x % 1000000 == 0) {
enc_ext(buffer, x / 1000000, 'S');
} else {
enc_ext(buffer, x / 1000, 'm');
}
} else {
enc_ext(buffer, x / 1000000, 'S');
}
}
void grpc_chttp2_encode_timeout(gpr_timespec timeout, char *buffer) {
if (timeout.tv_sec < 0) {
enc_tiny(buffer);
} else if (timeout.tv_sec == 0) {
enc_nanos(buffer, timeout.tv_nsec);
} else if (timeout.tv_sec < 1000 && timeout.tv_nsec != 0) {
enc_micros(buffer,
(int64_t)(timeout.tv_sec * 1000000) +
(timeout.tv_nsec / 1000 + (timeout.tv_nsec % 1000 != 0)));
} else {
enc_seconds(buffer, timeout.tv_sec + (timeout.tv_nsec != 0));
}
}
static int is_all_whitespace(const char *p) {
while (*p == ' ') p++;
return *p == 0;
}
int grpc_chttp2_decode_timeout(const char *buffer, gpr_timespec *timeout) {
int32_t x = 0;
const uint8_t *p = (const uint8_t *)buffer;
int have_digit = 0;
/* skip whitespace */
for (; *p == ' '; p++)
;
/* decode numeric part */
for (; *p >= '0' && *p <= '9'; p++) {
int32_t digit = (int32_t)(*p - (uint8_t)'0');
have_digit = 1;
/* spec allows max. 8 digits, but we allow values up to 1,000,000,000 */
if (x >= (100 * 1000 * 1000)) {
if (x != (100 * 1000 * 1000) || digit != 0) {
*timeout = gpr_inf_future(GPR_TIMESPAN);
return 1;
}
}
x = x * 10 + digit;
}
if (!have_digit) return 0;
/* skip whitespace */
for (; *p == ' '; p++)
;
/* decode unit specifier */
switch (*p) {
case 'n':
*timeout = gpr_time_from_nanos(x, GPR_TIMESPAN);
break;
case 'u':
*timeout = gpr_time_from_micros(x, GPR_TIMESPAN);
break;
case 'm':
*timeout = gpr_time_from_millis(x, GPR_TIMESPAN);
break;
case 'S':
*timeout = gpr_time_from_seconds(x, GPR_TIMESPAN);
break;
case 'M':
*timeout = gpr_time_from_minutes(x, GPR_TIMESPAN);
break;
case 'H':
*timeout = gpr_time_from_hours(x, GPR_TIMESPAN);
break;
default:
return 0;
}
p++;
return is_all_whitespace((const char *)p);
}
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