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Annotation of libwww/Library/src/HTEscape.html, revision 2.2

2.2     ! frystyk     1: <HTML>
        !             2: <HEAD>
2.1       frystyk     3: <TITLE>Escape and Unescape Illegal Characters in URIs</TITLE>
                      4: <NEXTID N="1">
2.2     ! frystyk     5: </HEAD>
2.1       frystyk     6: <BODY>
                      7: 
                      8: <H1>Escape and Unescape Illegal Characters in URIs</H1>
2.2     ! frystyk     9: 
        !            10: <PRE>
        !            11: /*
        !            12: **     (c) COPYRIGHT CERN 1994.
        !            13: **     Please first read the full copyright statement in the file COPYRIGH.
        !            14: */
        !            15: </PRE>
2.1       frystyk    16: 
                     17: This module have been spawned from <A HREF="HTParse.html">HTParse</A>,
                     18: as it then can be used in utility programs without loading a whole
                     19: bunch of the library code. It contains functions for escaping and
                     20: unescaping a URI for reserved characters in URIs. <P>
                     21: 
                     22: This module is implemented by <A HREF="HTEscape.c">HTEscape.c</A>, and
                     23: it is a part of the <A NAME="z10"
                     24: HREF="http://info.cern.ch/hypertext/WWW/Library/User/Guide/Guide.html">Library
                     25: of Common Code</A>.
                     26: 
                     27: <PRE>
                     28: #ifndef HTESCAPE_H
                     29: #define HTESCAPE_H
                     30: </PRE>
                     31: 
                     32: 
                     33: <H2>Encode Unacceptable Characters using %xy</H2>
                     34: 
                     35: This funtion takes a string containing any sequence of ASCII
                     36: characters, and returns a malloced string containing the same
                     37: infromation but with all "unacceptable" characters represented in the
                     38: form <CODE>%xy</CODE> where <CODE>x</CODE> and <CODE>y</CODE> are two
                     39: hex digits.
                     40: 
                     41: <PRE>
                     42: extern char * HTEscape PARAMS((CONST char * str, unsigned char mask));
                     43: </PRE>
                     44: 
                     45: The following are valid mask values. The terms are the BNF names in
                     46: the URI document.
                     47: 
                     48: <PRE>
                     49: #define URL_XALPHAS    (unsigned char) 1
                     50: #define URL_XPALPHAS   (unsigned char) 2
                     51: #define URL_PATH       (unsigned char) 4
                     52: </PRE>
                     53: 
                     54: <H2>Decode %xy Escaped Characters</H2>
                     55: 
                     56: This function takes a pointer to a string in which character smay have
                     57: been encoded in <CODE>%xy</CODE> form, where <CODE>xy</CODE> is the
                     58: acsii hex code for character 16x+y. The string is converted in place,
                     59: as it will never grow.
                     60: 
                     61: <PRE>
                     62: extern char * HTUnEscape PARAMS(( char * str));
                     63: 
                     64: 
                     65: #endif /* HTESCAPE_H */
                     66: </PRE>
                     67: 
                     68: End of HTEscape Module
                     69: </BODY>
                     70: </HTML>
                     71:
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