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/*
* Soft: Perform a GET query to a remote HTTP/HTTPS server.
* Set a timer to compute global remote server response
* time.
*
* Part: HTML stream parser utility functions.
*
* Authors: Alexandre Cassen, <acassen@linux-vs.org>
*
* 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.
*
* 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
* 2 of the License, or (at your option) any later version.
*
* Copyright (C) 2001-2017 Alexandre Cassen, <acassen@gmail.com>
*/
#include "config.h"
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include "html.h"
#include "memory.h"
/* HTTP header tag */
#define CONTENT_LENGTH "Content-Length:"
/* Return the http header content length */
size_t extract_content_length(const char *buffer, size_t size)
{
char *clen = strstr(buffer, CONTENT_LENGTH);
size_t len;
char *end;
/* Pattern not found */
if (!clen || clen > buffer + size)
return SIZE_MAX;
/* Content-Length extraction */
len = strtoul(clen + strlen(CONTENT_LENGTH), &end, 10);
if (*end && (*end != '\r' && *end != '\n'))
return SIZE_MAX;
return len;
}
/*
* Return the http header error code. According
* to rfc2616.6.1 status code is between HTTP_Version
* and Reason_Phrase, separated by space caracter.
*/
#include "logger.h"
int extract_status_code(const char *buffer, size_t size)
{
const char *buf_end = buffer + size;
char *end;
unsigned long code;
/* Status-Code extraction */
while (buffer < buf_end && *buffer != ' ' && *buffer != '\r')
buffer++;
if (*buffer != ' ')
return 0;
buffer++;
if (buffer + 3 >= buf_end || *buffer == ' ' || buffer[3] != ' ')
return 0;
code = strtoul(buffer, &end, 10); // This line causes a strict-overflow=4 warning with gcc 5.4.0
if (buffer + 3 != end)
return 0;
return code;
}
/* simple function returning a pointer to the html buffer begin */
const char * __attribute__ ((pure))
extract_html(const char *buffer, size_t size_buffer)
{
const char *end = buffer + size_buffer;
const char *cur;
for (cur = buffer; cur + 3 < end; cur++)
if (*cur == '\r' && *(cur+1) == '\n'
&& *(cur+2) == '\r' && *(cur+3) == '\n')
return cur + 4;
return NULL;
}
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