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Annotation of libwww/Library/src/HTDescpt.html, revision 2.13

2.1       frystyk     1: <HTML>
                      2: <HEAD>
2.12      frystyk     3: <TITLE>W3C Sample Code Library libwww File descriptions</TITLE>
2.11      frystyk     4: <!-- Changed by: Henrik Frystyk Nielsen, 23-Mar-1996 -->
2.1       frystyk     5: </HEAD>
                      6: <BODY>
                      7: 
                      8: <H1>File Descriptions</H1>
                      9: 
                     10: <PRE>
                     11: /*
2.5       frystyk    12: **     (c) COPYRIGHT MIT 1995.
2.1       frystyk    13: **     Please first read the full copyright statement in the file COPYRIGH.
                     14: */
                     15: </PRE>
                     16: 
2.8       frystyk    17: Descriptions appearing in <A HREF="HTDir.html">directory listings</A>
                     18: are produced by this module. This may be overridden by another module
                     19: for those who which descriptions to come from somewhere else. It's
                     20: only HTTP directory listings that contain a description field (if
                     21: enabled by the <A HREF="HTDir.html">Directory browsing module</A>.<P>
2.1       frystyk    22: 
2.8       frystyk    23: This module is implemented by <A HREF="HTDescpt.c">HTDescpt.c</A>, and
2.13    ! frystyk    24: it is a part of the <A HREF="http://www.w3.org/Library/"> W3C
2.12      frystyk    25: Sample Code Library</A>.
2.1       frystyk    26: 
                     27: <PRE>
                     28: #ifndef HTDESCRIPT_H
                     29: #define HTDESCRIPT_H
                     30: 
                     31: </PRE>
                     32: 
                     33: <H2>Description File</H2>
                     34: 
                     35: This module gets descriptions from the file defined by global variable
2.2       frystyk    36: <CODE>HTDescriptionFile</CODE> in the same directory as the directoy
                     37: to be listed. The default value is <CODE>.www_descript</CODE>:
                     38: 
2.1       frystyk    39: <PRE>
                     40: extern char * HTDescriptionFile;
                     41: </PRE>
                     42: 
                     43: In the description file lines starting with a word starting with 'D'
                     44: are taken to be descriptions (this looks funny now, but this is to
                     45: make it easy to extend these description files to contain also other
2.2       frystyk    46: information. An example of the format of the description file is:
                     47: 
2.1       frystyk    48: <PRE>
2.3       frystyk    49: /*
2.4       frystyk    50: **     DESCRIBE  welcome.html  Our welcome page
                     51: **     DESCRIBE  map*.gif      Map as a GIF image
                     52: **     DESCRIBE  map*.ps       Map as a PostScript image
2.3       frystyk    53: */
2.1       frystyk    54: </PRE>
                     55: 
                     56: <H2>HTML Titles</H2>
                     57: 
                     58: If description is not specified for a file that is of type
                     59: <CODE>text/html</CODE>, this module uses the HTML TITLE as the
                     60: description.  This feature can be turned off by setting the
                     61: <CODE>HTPeekTitles</CODE> variable to false.
2.2       frystyk    62: 
2.1       frystyk    63: <PRE>
                     64: extern BOOL HTPeekTitles;
                     65: </PRE>
                     66: 
                     67: <H2>Read Description File</H2>
                     68: 
                     69: The description file for a directory is read in only once by
                     70: <CODE>HTReadDescriptions()</CODE>, and the result returned by it is
                     71: given as an argument when finding out a description for a single file.
2.2       frystyk    72: 
2.1       frystyk    73: <PRE>
2.9       frystyk    74: extern HTList * HTReadDescriptions (char * dirname);
2.1       frystyk    75: </PRE>
                     76: 
                     77: <H2>Get Description For a File</H2>
                     78: 
                     79: Once description file has been read and the list of descriptions is
                     80: returned by <CODE>HTReadDescriptions()</CODE>, the function
                     81: <CODE>HTGetDescription()</CODE> can be used to get a description for a
                     82: given file:
2.2       frystyk    83: 
2.1       frystyk    84: <PRE>
2.9       frystyk    85: extern char * HTGetDescription (HTList *       descriptions,
2.1       frystyk    86:                                       char *   dirname,
                     87:                                       char *   filename,
2.9       frystyk    88:                                       HTFormat format);
2.1       frystyk    89: </PRE>
2.2       frystyk    90: 
2.1       frystyk    91: Directory name has to be present because this function may then take a
                     92: peek at the file itself (to get the HTML TITLE, for example).
                     93: If <CODE>format</CODE> is <CODE>WWW_HTML</CODE> and description is not
                     94: found, this module may be configured to use the HTML TITLE as the
                     95: description. <P>
                     96: 
                     97: <STRONG>No string returned by this function should be freed!</STRONG>
                     98: 
                     99: 
                    100: <H2>Freeing Descriptions</H2>
                    101: 
                    102: Once descriptions have been gotten, the description list returned by
                    103: <CODE>HTReadDescriptions()</CODE> must be freed by
                    104: <CODE>HTFreeDescriptions()</CODE>:
                    105: <PRE>
2.9       frystyk   106: extern void HTFreeDescriptions (HTList * descriptions);
2.1       frystyk   107: </PRE>
                    108: 
                    109: <PRE>
                    110: #endif /* !HTDESCRIPT_H */
                    111: </PRE>
2.11      frystyk   112: 
                    113: <HR>
                    114: <ADDRESS>
2.13    ! frystyk   115: @(#) $Id: HTDescpt.html,v 2.12 1997/02/16 18:42:07 frystyk Exp $
2.11      frystyk   116: </ADDRESS>
2.1       frystyk   117: </BODY>
                    118: </HTML>
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