path: root/WWW/Library/Implementation/HTFile.h

/*
 * $LynxId: HTFile.h,v 1.35 2021/07/29 22:54:21 tom Exp $
 *							File access in libwww
 *				FILE ACCESS
 *
 *  These are routines for local file access used by WWW browsers and servers.
 *  Implemented by HTFile.c.
 *
 *  If the file is not a local file, then we pass it on to HTFTP in case it
 *  can be reached by FTP.
 */
#ifndef HTFILE_H
#define HTFILE_H

#include <HTFormat.h>
#include <HTAccess.h>

#ifndef HTML_H
#include <HTML.h>		/* SCW */
#endif /* HTML_H */

#ifdef __cplusplus
extern "C" {
#endif
/*
 *  Controlling globals
 *
 *  These flags control how directories and files are represented as
 *  hypertext, and are typically set by the application from command
 *  line options, etc.
				 */ extern int HTDirAccess;
    /* Directory access level */

#define HT_DIR_FORBID           0	/* Altogether forbidden */
#define HT_DIR_SELECTIVE        1	/* If HT_DIR_ENABLE_FILE exists */
#define HT_DIR_OK               2	/* Any accessible directory */

#define HT_DIR_ENABLE_FILE      ".www_browsable"	/* If exists, can browse */

    extern int HTDirReadme;	/* Include readme files in listing? */

    /* Values: */
#define HT_DIR_README_NONE      0	/* No */
#define HT_DIR_README_TOP       1	/* Yes, first */
#define HT_DIR_README_BOTTOM    2	/* Yes, at the end */

#define HT_DIR_README_FILE              "README"

/*
 *  Convert filenames between local and WWW formats
 */
    extern char *HTURLPath_toFile(const char *name, int expand_all, int is_remote);
    extern char *HTnameOfFile_WWW(const char *name, int WWW_prefix, int expand_all);

#define HTLocalName(name)      HTnameOfFile_WWW(name,TRUE,TRUE)
#define HTfullURL_toFile(name) HTnameOfFile_WWW(name,FALSE,TRUE)
#define HTpartURL_toFile(name) HTnameOfFile_WWW(name,FALSE,FALSE)

/*
 *  Make a WWW name from a full local path name
 */
    extern char *WWW_nameOfFile(const char *name);

/*
 *  Generate the name of a cache file
 */
    extern char *HTCacheFileName(const char *name);

/*
 *  Generate fragments of HTML for source-view:
 */
    extern void HTStructured_doctype(HTStructured * target, HTFormat format_out);

    extern void HTStructured_meta(HTStructured * target, HTFormat format_out);
/*
 *  Output directory titles
 *
 * This is (like the next one) used by HTFTP. It is common code to generate
 * the title and heading 1 and the parent directory link for any anchor.
 *
 * changed to return TRUE if parent directory link was generated,
 * FALSE otherwise - KW
 */
    extern BOOL HTDirTitles(HTStructured * target, HTParentAnchor *anchor,
			    HTFormat format_out,
			    int tildeIsTop);

/*
 *	Check existence.
 */
    extern int HTStat(const char *filename,
		      struct stat *data);

/*	Load a document.
 *	----------------
 */
    extern int HTLoadFile(const char *addr,
			  HTParentAnchor *anchor,
			  HTFormat format_out,
			  HTStream *sink);

/*
 *  Output a directory entry
 *
 * This is used by HTFTP.c for example -- it is a common routine for
 *  generating a linked directory entry.
 */
    extern void HTDirEntry(HTStructured * target, /* in which to put the linked text */ const char *tail,	/* last part of directory name */
			   const char *entry);	/* name of this entry */

/*
 *  HTSetSuffix: Define the representation for a file suffix
 *
 *  This defines a mapping between local file suffixes and file content
 *  types and encodings.
 *
 *  ON ENTRY,
 *
 *  suffix		includes the "." if that is important (normally, yes!)
 *
 *  representation	is MIME-style content-type
 *
 *  encoding		is MIME-style content-transfer-encoding
 *			(8bit, 7bit, etc) or HTTP-style content-encoding
 *			(gzip, compress etc.)
 *
 *  quality		an a priori judgement of the quality of such files
 *			(0.0..1.0)
 *
 *  HTSetSuffix5 has one more parameter for a short description of the type
 *  which is otherwise derived from the representation:
 *
 *  desc		is a short textual description, or NULL
 *
 *  Examples:   HTSetSuffix(".ps", "application/postscript", "8bit", 1.0);
 *  Examples:   HTSetSuffix(".psz", "application/postscript", "gzip", 1.0);
 *  A MIME type could also indicate a non-trivial encoding on its own
 *  ("application/x-compressed-tar"), but in that case don't use encoding
 *  to also indicate it but use "binary" etc.
 */
    extern void HTSetSuffix5(const char *suffix,
			     const char *representation,
			     const char *encoding,
			     const char *desc,
			     double quality);

#define HTSetSuffix(suff,rep,enc,q) HTSetSuffix5(suff, rep, enc, NULL, q)

/*
 *  HTFileFormat: Get Representation and Encoding from file name.
 *
 *  ON EXIT,
 *
 *  return		The represntation it imagines the file is in.
 *
 *  *pEncoding		The encoding (binary, 7bit, etc). See HTSetSuffix.
 */
    extern HTFormat HTFileFormat(const char *filename,
				 HTAtom **pEncoding,
				 const char **pDesc);

/*
 *  HTCharsetFormat: Revise the file format in relation to the Lynx charset.
 *
 *  This checks the format associated with an anchor for
 *  for an extended MIME Content-Type, and if a charset is
 *  indicated, sets Lynx up for proper handling in relation
 *  to the currently selected character set. - FM
 */
    extern HTFormat HTCharsetFormat(HTFormat format,
				    HTParentAnchor *anchor,
				    int default_LYhndl);

/*	Get various pieces of meta info from file name.
 *	-----------------------------------------------
 *
 *  LYGetFileInfo fills in information that can be determined without
 *  an actual (new) access to the filesystem, based on current suffix
 *  and character set configuration.  If the file has been loaded and
 *  parsed before  (with the same URL generated here!) and the anchor
 *  is still around, some results may be influenced by that (in
 *  particular, charset info from a META tag - this is not actually
 *  tested!).
 *  The caller should not keep pointers to the returned objects around
 *  for too long, the valid lifetimes vary. In particular, the returned
 *  charset string should be copied if necessary.  If return of the
 *  file_anchor is requested, that one can be used to retrieve
 *  additional bits of info that are stored in the anchor object and
 *  are not covered here; as usual, don't keep pointers to the
 *  file_anchor longer than necessary since the object may disappear
 *  through HTuncache_current_document or at the next document load.
 *  - kw
 */
    extern void LYGetFileInfo(const char *filename,
			      HTParentAnchor **pfile_anchor,
			      HTFormat *pformat,
			      HTAtom **pencoding,
			      const char **pdesc,
			      const char **pcharset,
			      int *pfile_cs);

/*
 *  Determine file value from file name.
 */
    extern float HTFileValue(const char *filename);

/*
 *  Known compression types.
 */
    typedef enum {
	cftNone
	,cftCompress
	,cftGzip
	,cftBzip2
	,cftDeflate
	,cftBrotli
    } CompressFileType;

/*
 *  Determine compression type from file name, by looking at its suffix.
 */
    extern CompressFileType HTCompressFileType(const char *filename,
					       const char *dots,
					       int *rootlen);

/*
 *  Determine compression type from the content-encoding.
 */
    extern CompressFileType HTEncodingToCompressType(const char *encoding);
/*
 *  Determine compression type from the content-encoding.
 */
    extern CompressFileType HTContentTypeToCompressType(const char *ct);
/*
 *  Determine compression type from the content-type and/or content-encoding.
 */
    extern CompressFileType HTContentToCompressType(HTParentAnchor *anchor);
/*
 *  Determine compression encoding from the compression method.
 */
    extern const char *HTCompressTypeToEncoding(CompressFileType method);
/*
 *  Determine expected file-suffix from the compression method.
 */
    extern const char *HTCompressTypeToSuffix(CompressFileType method);
/*
 *  Determine write access to a file.
 *
 *  ON EXIT,
 *
 *  return value	YES if file can be accessed and can be written to.
 *
 *  BUGS
 *
 *   Isn't there a quicker way?
 */

#if defined(HAVE_CONFIG_H)

#ifndef HAVE_GETGROUPS
#define NO_GROUPS
#endif

#else

#ifdef VMS
#define NO_GROUPS
#endif				/* VMS */
#ifdef NO_UNIX_IO
#define NO_GROUPS
#endif				/* NO_UNIX_IO */
#ifdef PCNFS
#define NO_GROUPS
#endif				/* PCNFS */
#ifdef NOUSERS
#define NO_GROUPS
#endif				/* PCNFS */

#endif				/* HAVE_CONFIG_H */

    extern BOOL HTEditable(const char *filename);

/*	Make a save stream.
 *	-------------------
 */
    extern HTStream *HTFileSaveStream(HTParentAnchor *anchor);

/*
 * Determine a suitable suffix, given the representation.
 *
 *  ON ENTRY,
 *
 *  rep			is the atomized MIME style representation
 *  enc			is an encoding (8bit, binary, gzip, compress,..)
 *
 *  ON EXIT,
 *
 *  returns		a pointer to a suitable suffix string if one has
 *			been found, else NULL.
 */
    extern const char *HTFileSuffix(HTAtom *rep,
				    const char *enc);

/*
 * Enumerate external programs that lynx may assume exists.  Unlike those
 * given in download scripts, etc., lynx would really like to know their
 * absolute paths, for better security.
 */
    typedef enum {
	ppUnknown = 0
	,ppBROTLI
	,ppBZIP2
	,ppCHMOD
	,ppCOMPRESS
	,ppCOPY
	,ppCSWING
	,ppGZIP
	,ppINFLATE
	,ppINSTALL
	,ppMKDIR
	,ppMV
	,ppRLOGIN
	,ppRM
	,ppRMDIR
	,ppSETFONT
	,ppTAR
	,ppTELNET
	,ppTN3270
	,ppTOUCH
	,ppUNCOMPRESS
	,ppUNZIP
	,ppUUDECODE
	,ppZCAT
	,ppZIP
	,pp_Last
    } ProgramPaths;

/*
 * Given a program number, return its path
 */
    extern const char *HTGetProgramPath(ProgramPaths code);

/*
 * Store a program's path 
 */
    extern void HTSetProgramPath(ProgramPaths code,
				 const char *path);

/*
 * Reset the list of known program paths to the ones that are compiled-in
 */
    extern void HTInitProgramPaths(BOOL init);

/*
 *  The Protocols
 */
#ifdef GLOBALREF_IS_MACRO
    extern GLOBALREF (HTProtocol, HTFTP);
    extern GLOBALREF (HTProtocol, HTFile);

#else
    GLOBALREF HTProtocol HTFTP, HTFile;
#endif				/* GLOBALREF_IS_MACRO */

#ifdef __cplusplus
}
#endif
#endif				/* HTFILE_H */