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tor-android/external/privoxy/encode.c

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const char encode_rcs[] = "$Id: encode.c,v 1.24 2011/11/06 11:51:57 fabiankeil Exp $";
/*********************************************************************
*
* File : $Source: /cvsroot/ijbswa/current/encode.c,v $
*
* Purpose : Functions to encode and decode URLs, and also to
* encode cookies and HTML text.
*
* Copyright : Written by and Copyright (C) 2001 the
* Privoxy team. http://www.privoxy.org/
*
* Based on the Internet Junkbuster originally written
* by and Copyright (C) 1997 Anonymous Coders and
* Junkbusters Corporation. http://www.junkbusters.com
*
* 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.
*
* 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.
*
* The GNU General Public License should be included with
* this file. If not, you can view it at
* http://www.gnu.org/copyleft/gpl.html
* or write to the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*********************************************************************/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "miscutil.h"
#include "encode.h"
const char encode_h_rcs[] = ENCODE_H_VERSION;
/* Maps special characters in a URL to their equivalent % codes. */
static const char const url_code_map[256][4] = {
"", "%01", "%02", "%03", "%04", "%05", "%06", "%07", "%08", "%09",
"%0A", "%0B", "%0C", "%0D", "%0E", "%0F", "%10", "%11", "%12", "%13",
"%14", "%15", "%16", "%17", "%18", "%19", "%1A", "%1B", "%1C", "%1D",
"%1E", "%1F", "%20", "%21", "%22", "%23", "%24", "%25", "%26", "%27",
"%28", "%29", "", "%2B", "%2C", "", "", "%2F", "", "",
"", "", "", "", "", "", "", "", "%3A", "%3B",
"%3C", "%3D", "%3E", "%3F", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "",
"", "%5B", "%5C", "%5D", "%5E", "", "%60", "", "", "",
"", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "",
"", "", "", "%7B", "%7C", "%7D", "%7E", "%7F", "%80", "%81",
"%82", "%83", "%84", "%85", "%86", "%87", "%88", "%89", "%8A", "%8B",
"%8C", "%8D", "%8E", "%8F", "%90", "%91", "%92", "%93", "%94", "%95",
"%96", "%97", "%98", "%99", "%9A", "%9B", "%9C", "%9D", "%9E", "%9F",
"%A0", "%A1", "%A2", "%A3", "%A4", "%A5", "%A6", "%A7", "%A8", "%A9",
"%AA", "%AB", "%AC", "%AD", "%AE", "%AF", "%B0", "%B1", "%B2", "%B3",
"%B4", "%B5", "%B6", "%B7", "%B8", "%B9", "%BA", "%BB", "%BC", "%BD",
"%BE", "%BF", "%C0", "%C1", "%C2", "%C3", "%C4", "%C5", "%C6", "%C7",
"%C8", "%C9", "%CA", "%CB", "%CC", "%CD", "%CE", "%CF", "%D0", "%D1",
"%D2", "%D3", "%D4", "%D5", "%D6", "%D7", "%D8", "%D9", "%DA", "%DB",
"%DC", "%DD", "%DE", "%DF", "%E0", "%E1", "%E2", "%E3", "%E4", "%E5",
"%E6", "%E7", "%E8", "%E9", "%EA", "%EB", "%EC", "%ED", "%EE", "%EF",
"%F0", "%F1", "%F2", "%F3", "%F4", "%F5", "%F6", "%F7", "%F8", "%F9",
"%FA", "%FB", "%FC", "%FD", "%FE", "%FF"
};
/* Maps special characters in HTML to their equivalent entities. */
static const char * const html_code_map[256] = {
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,"&quot;",NULL,NULL,NULL,"&amp;","&#39;",
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
"&lt;",NULL,"&gt;",NULL,NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL
};
/*********************************************************************
*
* Function : html_encode
*
* Description : Encodes a string so it's not interpreted as
* containing HTML tags or entities.
* Replaces <, >, &, and " with the appropriate HTML
* entities.
*
* Parameters :
* 1 : s = String to encode. Null-terminated.
*
* Returns : Encoded string, newly allocated on the heap.
* Caller is responsible for freeing it with free().
* If s is NULL, or on out-of memory, returns NULL.
*
*********************************************************************/
char * html_encode(const char *s)
{
char * buf;
size_t buf_size;
if (s == NULL)
{
return NULL;
}
/* each input char can expand to at most 6 chars */
buf_size = (strlen(s) * 6) + 1;
buf = (char *) malloc(buf_size);
if (buf)
{
char c;
char * p = buf;
while ( (c = *s++) != '\0')
{
const char * replace_with = html_code_map[(unsigned char) c];
if(replace_with != NULL)
{
const size_t bytes_written = (size_t)(p - buf);
assert(bytes_written < buf_size);
p += strlcpy(p, replace_with, buf_size - bytes_written);
}
else
{
*p++ = c;
}
}
*p = '\0';
}
assert(strlen(buf) < buf_size);
return(buf);
}
/*********************************************************************
*
* Function : html_encode_and_free_original
*
* Description : Encodes a string so it's not interpreted as
* containing HTML tags or entities.
* Replaces <, >, &, and " with the appropriate HTML
* entities. Free()s original string.
* If original string is NULL, simply returns NULL.
*
* Parameters :
* 1 : s = String to encode. Null-terminated.
*
* Returns : Encoded string, newly allocated on the heap.
* Caller is responsible for freeing it with free().
* If s is NULL, or on out-of memory, returns NULL.
*
*********************************************************************/
char * html_encode_and_free_original(char *s)
{
char * result;
if (s == NULL)
{
return NULL;
}
result = html_encode(s);
free(s);
return result;
}
/*********************************************************************
*
* Function : url_encode
*
* Description : Encodes a string so it can be used in a URL
* query string. Replaces special characters with
* the appropriate %xx codes.
*
* XXX: url_query_encode() would be a more fitting
* name.
*
* Parameters :
* 1 : s = String to encode. Null-terminated.
*
* Returns : Encoded string, newly allocated on the heap.
* Caller is responsible for freeing it with free().
* If s is NULL, or on out-of memory, returns NULL.
*
*********************************************************************/
char * url_encode(const char *s)
{
char * buf;
size_t buf_size;
if (s == NULL)
{
return NULL;
}
/* each input char can expand to at most 3 chars */
buf_size = (strlen(s) * 3) + 1;
buf = (char *) malloc(buf_size);
if (buf)
{
char c;
char * p = buf;
while( (c = *s++) != '\0')
{
const char *replace_with = url_code_map[(unsigned char) c];
if (*replace_with != '\0')
{
const size_t bytes_written = (size_t)(p - buf);
assert(bytes_written < buf_size);
p += strlcpy(p, replace_with, buf_size - bytes_written);
}
else
{
*p++ = c;
}
}
*p = '\0';
}
assert(strlen(buf) < buf_size);
return(buf);
}
/*********************************************************************
*
* Function : xdtoi
*
* Description : Converts a single hex digit to an integer.
*
* Parameters :
* 1 : d = in the range of ['0'..'9', 'A'..'F', 'a'..'f']
*
* Returns : The integer value, or -1 for non-hex characters.
*
*********************************************************************/
static int xdtoi(const int d)
{
if ((d >= '0') && (d <= '9'))
{
return(d - '0');
}
else if ((d >= 'a') && (d <= 'f'))
{
return(d - 'a' + 10);
}
else if ((d >= 'A') && (d <= 'F'))
{
return(d - 'A' + 10);
}
else
{
return(-1);
}
}
/*********************************************************************
*
* Function : xtoi
*
* Description : Hex string to integer conversion.
*
* Parameters :
* 1 : s = a 2 digit hex string (e.g. "1f"). Only the
* first two characters will be looked at.
*
* Returns : The integer value, or 0 for non-hex strings.
*
*********************************************************************/
int xtoi(const char *s)
{
int d1;
d1 = xdtoi(*s);
if(d1 >= 0)
{
int d2 = xdtoi(*(s+1));
if(d2 >= 0)
{
return (d1 << 4) + d2;
}
}
return 0;
}
/*********************************************************************
*
* Function : url_decode
*
* Description : Decodes a URL query string, replacing %xx codes
* with their decoded form.
*
* Parameters :
* 1 : s = String to decode. Null-terminated.
*
* Returns : Decoded string, newly allocated on the heap.
* Caller is responsible for freeing it with free().
*
*********************************************************************/
char *url_decode(const char * s)
{
char *buf = malloc(strlen(s) + 1);
char *q = buf;
if (buf)
{
while (*s)
{
switch (*s)
{
case '+':
s++;
*q++ = ' ';
break;
case '%':
if ((*q = (char)xtoi(s + 1)) != '\0')
{
s += 3;
q++;
}
else
{
/* malformed, just use it */
*q++ = *s++;
}
break;
default:
*q++ = *s++;
break;
}
}
*q = '\0';
}
return(buf);
}
/*********************************************************************
*
* Function : percent_encode_url
*
* Description : Percent-encodes a string so it no longer contains
* any characters that aren't valid in an URL according
* to RFC 3986.
*
* XXX: Do not confuse with encode_url()
*
* Parameters :
* 1 : s = String to encode. Null-terminated.
*
* Returns : Encoded string, newly allocated on the heap.
* Caller is responsible for freeing it with free().
* If s is NULL, or on out-of memory, returns NULL.
*
*********************************************************************/
char *percent_encode_url(const char *s)
{
static const char allowed_characters[128] = {
'\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0',
'\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0',
'\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0',
'\0', '\0', '\0', '!', '\0', '#', '$', '%', '&', '\'',
'(', ')', '*', '+', ',', '-', '.', '/', '0', '1',
'2', '3', '4', '5', '6', '7', '8', '9', ':', ';',
'\0', '=', '\0', '?', '@', 'A', 'B', 'C', 'D', 'E',
'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y',
'Z', '[', '\0', ']', '\0', '_', '\0', 'a', 'b', 'c',
'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
'x', 'y', 'z', '\0', '\0', '\0', '~', '\0'
};
char *buf;
size_t buf_size;
assert(s != NULL);
/* Each input char can expand to at most 3 chars. */
buf_size = (strlen(s) * 3) + 1;
buf = (char *)malloc(buf_size);
if (buf != NULL)
{
char c;
char *p = buf;
while((c = *s++) != '\0')
{
const unsigned int i = (unsigned char)c;
if (i >= sizeof(allowed_characters) || '\0' == allowed_characters[i])
{
const char *replace_with = url_code_map[i];
assert(*replace_with != '\0');
if (*replace_with != '\0')
{
const size_t bytes_written = (size_t)(p - buf);
assert(bytes_written < buf_size);
p += strlcpy(p, replace_with, buf_size - bytes_written);
}
}
else
{
*p++ = c;
}
}
*p = '\0';
}
assert(strlen(buf) < buf_size);
return(buf);
}
/*
Local Variables:
tab-width: 3
end:
*/
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