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<HTML>
<HEAD>
<TITLE>File access in libwww</TITLE>
<NEXTID N="z4">
</HEAD>
<BODY>
<H1>File Access</H1>These are routines for local file
access used by WWW browsers and servers.
Implemented by <A HREF="HTFile.c">HTFile.c</A>. This module is a part of the
<A HREF="Overview.html">CERN Common WWW Library</A>.<P>
If the file is not a local file,
then we pass it on to <A
NAME="z3" HREF="HTFTP.html">HTFTP</A> in case
it can be reached by FTP. However, as this is very time consuming when
requesting a local file that actually doesn't exist, this redirection will
be disabled in the next major release, <EM>www-bug@info.cern.ch</EM>
June 1994.<P>
<B>Note:</B> All functions that deal with directory listings etc. have been
moved to <A HREF="HTDirBrw.html">HTDirBrw Module</A>.
<PRE>
#ifndef HTFILE_H
#define HTFILE_H
#include "HTFormat.h"
#include "HTAccess.h"
#include "HTML.h" /* SCW */
#include "HTDirBrw.h"
#ifdef SHORT_NAMES
#define HTGetCoD HTGetContentDescription
#define HTSplFiN HTSplitFilename
#endif /*SHORT_NAMES*/
</PRE>
<H2>Multiformat Handling</H2>
<H3>Split Filename to suffixes</H3>
<PRE>
PUBLIC int HTSplitFilename PARAMS((char * s_str,
char ** s_arr));
</PRE>
<H3>Get Content Description According to Suffixes</H3>
<PRE>
PUBLIC HTContentDescription * HTGetContentDescription PARAMS((char ** actual,
int n));
#define MULTI_SUFFIX ".multi" /* Extension for scanning formats */
#define MAX_SUFF 15 /* Maximum number of suffixes for a file */
</PRE>
<H2>Convert filenames between local and WWW formats</H2>
<PRE>extern char * HTLocalName PARAMS((CONST char * name));
</PRE>
<H2>Make a WWW name from a full local
path name</H2>
<PRE>extern char * WWW_nameOfFile PARAMS((const char * name));
</PRE>
<H2>Generate the name of a cache file</H2>
<PRE>extern char * HTCacheFileName PARAMS((CONST char * name));
</PRE>
<H2><A
NAME="z1">HTSetSuffix: Define the representation
for a file suffix</A></H2>This defines a mapping between local
file suffixes and file content types
and encodings.
<H3>On entry,</H3>
<DL>
<DT>suffix
<DD> includes the "." if that is
important (normally, yes!)
<DT>representation
<DD> is MIME-style content-type
<DT>encoding
<DD> is MIME-style <A
NAME="z0" HREF="../../Protocols/rfc1341/5_Content-Transfer-Encoding.html#z0">content-transfer-encoding</A>
(8bit, 7bit, etc)
<DT>language
<DD>is MIME-style content-language
<DT>quality
<DD> an a priori judgement of
the quality of such files (0.0..1.0)
</DL>
<PRE>
/*
** Example: HTSetSuffix(".ps", "application/postscript", "8bit", NULL, 1.0);
*/
PUBLIC void HTSetSuffix PARAMS((CONST char * suffix,
CONST char * representation,
CONST char * encoding,
CONST char * language,
float quality));
PUBLIC void HTAddType PARAMS((CONST char * suffix,
CONST char * representation,
CONST char * encoding,
float quality));
PUBLIC void HTAddEncoding PARAMS((CONST char * suffix,
CONST char * encoding,
float quality));
PUBLIC void HTAddLanguage PARAMS((CONST char * suffix,
CONST char * language,
float quality));
</PRE>
<H2>HTFileFormat: Get Representation
and Encoding from file name</H2>
<H3>On exit,</H3>
<DL>
<DT>return
<DD> The represntation it imagines
the file is in
<DT>*pEncoding
<DD> The encoding (binary,
7bit, etc). See <A
NAME="z2" HREF="#z1">HTSetSuffix</A> .
<DT>*pLanguage
<DD> The language.
</DL>
<PRE>extern HTFormat HTFileFormat PARAMS((
CONST char * filename,
HTAtom ** pEncoding,
HTAtom ** pLanguage));
</PRE>
<H2>Determine file value from file name</H2>
<PRE>
extern float HTFileValue PARAMS((
CONST char * filename));
</PRE>
<H2>Determine write access to a file</H2>
<H3>On exit,</H3>
<DL>
<DT>return value
<DD> YES if file can be accessed
and can be written to.
</DL>
<PRE>
</PRE>
<H3>Bugs</H3>Isn't there a quicker way?
<PRE>
extern BOOL HTEditable PARAMS((CONST char * filename));
</PRE>
<H2>Determine a suitable suffix, given
the representation</H2>
<H3>On entry,</H3>
<DL>
<DT>rep
<DD> is the atomized MIME style representation
</DL>
<H3>On exit,</H3>
<DL>
<DT>returns
<DD> a pointer to a suitable suffix
string if one has been found, else
NULL.
</DL>
<PRE>extern CONST char * HTFileSuffix PARAMS((
HTAtom* rep));
</PRE>
<H2>The Protocols</H2>
<PRE>GLOBALREF HTProtocol HTFTP, HTFile;
#endif /* HTFILE_H */
</PRE>end of HTFile</A></BODY>
</HTML>
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