nghttp2/src/util.cc

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/*
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* nghttp2 - HTTP/2.0 C Library
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*
* Copyright (c) 2012 Tatsuhiro Tsujikawa
*
* 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 "util.h"
#include <time.h>
#include <cassert>
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#include <cstdio>
#include <cstring>
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#include "timegm.h"
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namespace nghttp2 {
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namespace util {
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const char DEFAULT_STRIP_CHARSET[] = "\r\n\t ";
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bool isAlpha(const char c)
{
return ('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z');
}
bool isDigit(const char c)
{
return '0' <= c && c <= '9';
}
bool isHexDigit(const char c)
{
return isDigit(c) || ('A' <= c && c <= 'F') || ('a' <= c && c <= 'f');
}
bool inRFC3986UnreservedChars(const char c)
{
static const char unreserved[] = { '-', '.', '_', '~' };
return isAlpha(c) || isDigit(c) ||
std::find(&unreserved[0], &unreserved[4], c) != &unreserved[4];
}
std::string percentEncode(const unsigned char* target, size_t len)
{
std::string dest;
for(size_t i = 0; i < len; ++i) {
if(inRFC3986UnreservedChars(target[i])) {
dest += target[i];
} else {
char temp[4];
snprintf(temp, sizeof(temp), "%%%02X", target[i]);
dest.append(temp);
//dest.append(fmt("%%%02X", target[i]));
}
}
return dest;
}
std::string percentEncode(const std::string& target)
{
return percentEncode(reinterpret_cast<const unsigned char*>(target.c_str()),
target.size());
}
std::string percentDecode
(std::string::const_iterator first, std::string::const_iterator last)
{
std::string result;
for(; first != last; ++first) {
if(*first == '%') {
if(first+1 != last && first+2 != last &&
isHexDigit(*(first+1)) && isHexDigit(*(first+2))) {
std::string numstr(first+1, first+3);
result += strtol(numstr.c_str(), 0, 16);
first += 2;
} else {
result += *first;
}
} else {
result += *first;
}
}
return result;
}
std::string http_date(time_t t)
{
char buf[32];
tm* tms = gmtime(&t); // returned struct is statically allocated.
size_t r = strftime(buf, sizeof(buf), "%a, %d %b %Y %H:%M:%S GMT", tms);
return std::string(&buf[0], &buf[r]);
}
time_t parse_http_date(const std::string& s)
{
tm tm;
memset(&tm, 0, sizeof(tm));
char* r = strptime(s.c_str(), "%a, %d %b %Y %H:%M:%S GMT", &tm);
if(r == 0) {
return 0;
}
return timegm(&tm);
}
bool startsWith(const std::string& a, const std::string& b)
{
return startsWith(a.begin(), a.end(), b.begin(), b.end());
}
bool istartsWith(const std::string& a, const std::string& b)
{
return istartsWith(a.begin(), a.end(), b.begin(), b.end());
}
namespace {
void streq_advance(const char **ap, const char **bp)
{
for(; **ap && **bp && lowcase(**ap) == lowcase(**bp); ++*ap, ++*bp);
}
} // namespace
bool istartsWith(const char *a, const char* b)
{
if(!a || !b) {
return false;
}
streq_advance(&a, &b);
return !*b;
}
bool endsWith(const std::string& a, const std::string& b)
{
return endsWith(a.begin(), a.end(), b.begin(), b.end());
}
bool strieq(const char *a, const char *b)
{
if(!a || !b) {
return false;
}
for(; *a && *b && lowcase(*a) == lowcase(*b); ++a, ++b);
return !*a && !*b;
}
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bool strieq(const char *a, const uint8_t *b, size_t bn)
{
if(!a || !b) {
return false;
}
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const uint8_t *blast = b + bn;
for(; *a && b != blast && lowcase(*a) == lowcase(*b); ++a, ++b);
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return !*a && b == blast;
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}
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bool streq(const char *a, const uint8_t *b, size_t bn)
{
if(!a || !b) {
return false;
}
const uint8_t *blast = b + bn;
for(; *a && b != blast && *a == *b; ++a, ++b);
return !*a && b == blast;
}
bool streq(const uint8_t *a, size_t alen, const uint8_t *b, size_t blen)
{
if(alen != blen) {
return false;
}
return memcmp(a, b, alen) == 0;
}
int strcompare(const char *a, const uint8_t *b, size_t bn)
{
assert(a && b);
const uint8_t *blast = b + bn;
for(; *a && b != blast; ++a, ++b) {
if(*a < *b) {
return -1;
} else if(*a > *b) {
return 1;
}
}
if(!*a && b == blast) {
return 0;
} else if(b == blast) {
return 1;
} else {
return -1;
}
}
bool strifind(const char *a, const char *b)
{
if(!a || !b) {
return false;
}
for(size_t i = 0; a[i]; ++i) {
const char *ap = &a[i], *bp = b;
for(; *ap && *bp && lowcase(*ap) == lowcase(*bp); ++ap, ++bp);
if(!*bp) {
return true;
}
}
return false;
}
char upcase(char c)
{
if('a' <= c && c <= 'z') {
return c-'a'+'A';
} else {
return c;
}
}
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std::string format_hex(const unsigned char *s, size_t len)
{
std::string res;
for(size_t i = 0; i < len; ++i) {
unsigned char c = s[i] >> 4;
if(c > 9) {
res += c - 10 + 'a';
} else {
res += c + '0';
}
c = s[i] & 0xf;
if(c > 9) {
res += c - 10 + 'a';
} else {
res += c + '0';
}
}
return res;
}
void to_token68(std::string& base64str)
{
for(auto i = std::begin(base64str); i != std::end(base64str); ++i) {
switch(*i) {
case '+':
*i = '-';
break;
case '/':
*i = '_';
break;
case '=':
base64str.erase(i, std::end(base64str));
return;
}
}
return;
}
void to_base64(std::string& token68str)
{
for(auto i = std::begin(token68str); i != std::end(token68str); ++i) {
switch(*i) {
case '-':
*i = '+';
break;
case '_':
*i = '/';
break;
}
}
token68str += std::string(4 - token68str.size() % 4, '=');
return;
}
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void inp_strlower(std::string& s)
{
for(auto i = std::begin(s); i != std::end(s); ++i) {
if('A' <= *i && *i <= 'Z') {
*i = (*i) - 'A' + 'a';
}
}
}
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} // namespace util
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} // namespace nghttp2