gecko-dev/xpcom/io/nsEscape.cpp
1999-04-12 20:23:21 +00:00

215 lines
5.5 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
// First checked in on 98/12/03 by John R. McMullen, derived from net.h/mkparse.c.
#include "nsEscape.h"
#include "plstr.h"
#include "prmem.h"
const int netCharType[256] =
/* Bit 0 xalpha -- the alphas
** Bit 1 xpalpha -- as xalpha but
** converts spaces to plus and plus to %20
** Bit 3 ... path -- as xalphas but doesn't escape '/'
*/
/* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 1x */
0,0,0,0,0,0,0,0,0,0,7,4,0,7,7,4, /* 2x !"#$%&'()*+,-./ */
7,7,7,7,7,7,7,7,7,7,0,0,0,0,0,0, /* 3x 0123456789:;<=>? */
0,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, /* 4x @ABCDEFGHIJKLMNO */
/* bits for '@' changed from 7 to 0 so '@' can be escaped */
/* in usernames and passwords in publishing. */
7,7,7,7,7,7,7,7,7,7,7,0,0,0,0,7, /* 5X PQRSTUVWXYZ[\]^_ */
0,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, /* 6x `abcdefghijklmno */
7,7,7,7,7,7,7,7,7,7,7,0,0,0,0,0, /* 7X pqrstuvwxyz{\}~ DEL */
0, };
/* decode % escaped hex codes into character values
*/
#define UNHEX(C) \
((C >= '0' && C <= '9') ? C - '0' : \
((C >= 'A' && C <= 'F') ? C - 'A' + 10 : \
((C >= 'a' && C <= 'f') ? C - 'a' + 10 : 0)))
#define IS_OK(C) (netCharType[((unsigned int) (C))] & (mask))
#define HEX_ESCAPE '%'
//----------------------------------------------------------------------------------------
NS_BASE char* nsEscape(const char * str, nsEscapeMask mask)
//----------------------------------------------------------------------------------------
{
if(!str)
return NULL;
return nsEscapeCount(str, (PRInt32)PL_strlen(str), mask, NULL);
}
//----------------------------------------------------------------------------------------
NS_BASE char* nsEscapeCount(
const char * str,
PRInt32 len,
nsEscapeMask mask,
PRInt32* out_len)
//----------------------------------------------------------------------------------------
{
if (!str)
return 0;
int i, extra = 0;
char* hexChars = "0123456789ABCDEF";
register const unsigned char* src = (const unsigned char *) str;
for (i = 0; i < len; i++)
{
if (!IS_OK(*src++))
extra += 2; /* the escape, plus an extra byte for each nibble */
}
char* result = new char[len + extra + 1];
if (!result)
return 0;
register unsigned char* dst = (unsigned char *) result;
src = (const unsigned char *) str;
if (mask == url_XPAlphas)
{
for (i = 0; i < len; i++)
{
unsigned char c = *src++;
if (IS_OK(c))
*dst++ = c;
else if (c == ' ')
*dst++ = '+'; /* convert spaces to pluses */
else
{
*dst++ = HEX_ESCAPE;
*dst++ = hexChars[c >> 4]; /* high nibble */
*dst++ = hexChars[c & 0x0f]; /* low nibble */
}
}
}
else
{
for (i = 0; i < len; i++)
{
unsigned char c = *src++;
if (IS_OK(c))
*dst++ = c;
else
{
*dst++ = HEX_ESCAPE;
*dst++ = hexChars[c >> 4]; /* high nibble */
*dst++ = hexChars[c & 0x0f]; /* low nibble */
}
}
}
*dst = '\0'; /* tack on eos */
if(out_len)
*out_len = dst - (unsigned char *) result;
return result;
}
//----------------------------------------------------------------------------------------
NS_BASE char* nsUnescape(char * str)
//----------------------------------------------------------------------------------------
{
nsUnescapeCount(str);
return str;
}
//----------------------------------------------------------------------------------------
NS_BASE PRInt32 nsUnescapeCount(char * str)
//----------------------------------------------------------------------------------------
{
register char *src = str;
register char *dst = str;
while (*src)
if (*src != HEX_ESCAPE)
*dst++ = *src++;
else
{
src++; /* walk over escape */
if (*src)
{
*dst = UNHEX(*src) << 4;
src++;
}
if (*src)
{
*dst = (*dst + UNHEX(*src));
src++;
}
dst++;
}
*dst = 0;
return (int)(dst - str);
} /* NET_UnEscapeCnt */
NS_BASE char *
nsEscapeHTML(const char * string)
{
char *rv = (char *) PR_Malloc(PL_strlen(string)*4 + 1); /* The +1 is for
the trailing
null! */
char *ptr = rv;
if(rv)
{
for(; *string != '\0'; string++)
{
if(*string == '<')
{
*ptr++ = '&';
*ptr++ = 'l';
*ptr++ = 't';
*ptr++ = ';';
}
else if(*string == '>')
{
*ptr++ = '&';
*ptr++ = 'g';
*ptr++ = 't';
*ptr++ = ';';
}
else if(*string == '&')
{
*ptr++ = '&';
*ptr++ = 'a';
*ptr++ = 'm';
*ptr++ = 'p';
*ptr++ = ';';
}
else
{
*ptr++ = *string;
}
}
*ptr = '\0';
}
return(rv);
}