http.c
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/**
* \file
*
* \author Georg Hopp
*
* \copyright
* Copyright © 2012 Georg Hopp
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <time.h>
#include <stdlib.h>
#include <ctype.h>
#include <sys/types.h>
#include <string.h>
#include "http/message.h"
#include "http/request.h"
#include "http/response.h"
#include "class.h"
#include "commons.h"
#define ALPHAVAL(x) (tolower((x)) - 'a' + 0xa)
#define DIGITVAL(x) ((x) - '0')
#define ALNUMVAL(x) (isdigit((x))?DIGITVAL((x)):ALPHAVAL((x)))
static const char *DAY_NAMES[] = {
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
static const char *MONTH_NAMES[] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
/*
* This one is not thread save.
*/
size_t
rfc1123Gmt(char * buffer, size_t _nbuf, const time_t * t)
{
struct tm * tmp = gmtime(t);
size_t nbuf;
nbuf = strftime(buffer, _nbuf, "---, %d --- %Y %T GMT", tmp);
memcpy(buffer, DAY_NAMES[tmp->tm_wday], 3);
memcpy(buffer+8, MONTH_NAMES[tmp->tm_mon], 3);
return nbuf;
}
/*
* This one is not thread save.
*/
size_t
rfc1123GmtNow(char * buffer, size_t _nbuf)
{
time_t t = time(NULL);
return rfc1123Gmt(buffer, _nbuf, &t);
}
/**
* Decode an url encoded string. This expects a valid url
* encoded string and it size as arguments, else the behaviour
* of this function is undefined.
* This function modifies the data in buffer. No copy is made.
* The reason for this is only performance.
*/
size_t
urldecode(char * buffer, size_t nbuffer)
{
char * buf_ptr = buffer;
char * res_ptr = buffer;
for(; 0 < nbuffer; nbuffer--, buf_ptr++, res_ptr++) {
switch(*buf_ptr) {
case '%':
*res_ptr = (ALNUMVAL(buf_ptr[1]) << 4) | ALNUMVAL(buf_ptr[2]);
buf_ptr += 2;
nbuffer -= 2;
break;
case '+':
*buf_ptr = ' ';
/* intended drop through */
default:
*res_ptr = *buf_ptr;
break;
}
}
*res_ptr = 0;
return res_ptr - buffer;
}
char
isHttpVersion(const char * str, size_t len)
{
if (NULL == str)
return FALSE;
if (8 > len)
return FALSE;
if (0 != memcmp("HTTP/", str, sizeof("HTTP/")-1))
return FALSE;
return TRUE;
}
HttpMessage
httpGetMessage(
const char * part1, size_t len1,
const char * part2, size_t len2,
const char * part3, size_t len3)
{
if (isHttpVersion(part1, len1)) {
return new(HttpResponse,
part1, len1,
strtoul(part2, NULL, 10),
part3, len3);
}
if (isHttpVersion(part3, len3)) {
return new(HttpRequest,
part1, len1,
part2, len2,
part3, len3);
}
return NULL;
}
// vim: set ts=4 sw=4: