/* Copyright (C) 2004 J.F.Dockes
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef _INTERNFILE_H_INCLUDED_
#define _INTERNFILE_H_INCLUDED_
// The class changes according to RCL_USE_XATTR
#include "autoconfig.h"
#include <string>
#include <vector>
#include <map>
#include <set>
using std::string;
using std::vector;
using std::map;
using std::set;
#include "mimehandler.h"
#include "uncomp.h"
#include "pathut.h"
class RclConfig;
namespace Rcl {
class Doc;
}
struct stat;
/** Storage for missing helper program info. We want to keep this out of the
* FileInterner class, because the data will typically be accumulated by several
* FileInterner objects. Can't use static member either (because there
* may be several separate usages of the class which shouldn't mix
* their data).
*/
class FIMissingStore {
public:
FIMissingStore() {}
FIMissingStore(const string& in);
virtual ~FIMissingStore() {}
virtual void addMissing(const string& prog, const string& mt)
{
m_typesForMissing[prog].insert(mt);
}
// Get simple progs list string
virtual void getMissingExternal(string& out);
// Get progs + assoc mtypes description string
virtual void getMissingDescription(string& out);
// Missing external programs
map<string, set<string> > m_typesForMissing;
};
/**
* Convert data from file-serialized form (either an actual File
* System file or a memory image) into one or several documents in
* internal representation (Rcl::Doc). This can be used for indexing,
* or viewing at query time (GUI preview), or extracting an internal
* document out of a compound file into a simple one.
*
* Things work a little differently when indexing or previewing:
* - When indexing, all data has to come from the datastore, and it is
* normally desired that all found subdocuments be returned (ie:
* all messages and attachments out of a single file mail folder)
* - When previewing, some data is taken from the index (ie: the mime type
* is already known, and a single document usually needs to be processed,
* so that the full doc identifier is passed in: high level url
* (ie: file path) and internal identifier: ipath, ie: message and
* attachment number.
*
* Internfile is the part of the code which knows about ipath structure.
*
* The class has a number of static helper method which could just as well not
* be members and are in there just for namespace reasons.
*
*/
class FileInterner {
public:
/** Operation modifier flags */
enum Flags {FIF_none, FIF_forPreview, FIF_doUseInputMimetype};
/** Return values for internfile() */
enum Status {FIError, FIDone, FIAgain};
/** Constructors take the initial step to preprocess the data object and
* create the top filter */
/**
* Identify and possibly decompress file, and create the top filter.
* - The mtype parameter is not always set (it is when the object is
* created for previewing a file).
* - Filter output may be different for previewing and indexing.
*
* This constructor is now only used for indexing, the form with
* an Rcl::Doc parameter to identify the data is always used
* at query time.
*
* @param fn file name.
* @param stp pointer to updated stat struct.
* @param cnf Recoll configuration.
* @param td temporary directory to use as working space if
* decompression needed. Must be private and will be wiped clean.
* @param mtype mime type if known. For a compressed file this is the
* mime type for the uncompressed version.
*/
FileInterner(const string &fn, const struct stat *stp,
RclConfig *cnf, int flags, const string *mtype = 0);
/**
* Alternate constructor for the case where the data is in memory.
* This is mainly for data extracted from the web cache. The mime type
* must be set, input must be already uncompressed.
*/
FileInterner(const string &data, RclConfig *cnf,
int flags, const string& mtype);
/**
* Alternate constructor used at query time. We don't know where
* the data was stored, this is determined from the Rcl::Doc data
*
* @param idoc Rcl::Doc object built from index data. The back-end
* storage identifier (rclbes field) is used to build the
* appropriate fetcher which uses the rest of the Doc fields (url,
* ipath...) to retrieve the file or a file reference, which we
* then process normally.
*/
FileInterner(const Rcl::Doc& idoc, RclConfig *cnf, int flags);
~FileInterner();
void setMissingStore(FIMissingStore *st)
{
m_missingdatap = st;
}
/**
* Turn file or file part into Recoll document.
*
* For multidocument files (ie: mail folder), this must be called
* multiple times to retrieve the subdocuments.
*
* @param doc output document
* @param ipath internal path. If set by caller, the specified subdoc will
* be returned. Else the next document according to current state will
* be returned, and doc.ipath will be set on output.
* @return FIError and FIDone are self-explanatory. If FIAgain is returned,
* this is a multi-document file, with more subdocs, and internfile()
* should be called again to get the following one(s).
*/
Status internfile(Rcl::Doc& doc, const string &ipath = "");
/** Extract subdoc defined by ipath in idoc to file. See params for
idocToFile() */
bool interntofile(TempFile& otemp, const string& tofile,
const string& ipath, const string& mimetype);
/** Return the file's (top level object) mimetype (useful for
* creating the pseudo-doc for container files)
*/
const string& getMimetype() {return m_mimetype;}
/** We normally always return text/plain data. A caller can request
* that we stop conversion at the native document type (ie: extracting
* an email attachment in its native form for an external viewer)
*/
void setTargetMType(const string& tp) {m_targetMType = tp;}
/** In case we see an html version while converting, it is set aside
* and can be recovered
*/
const string& get_html() {return m_html;}
/** If we happen to be processing an image file and need a temp file,
we keep it around to save work for our caller, which can get it here */
TempFile get_imgtmp() {return m_imgtmp;}
const string& getReason() const
{
return m_reason;
}
bool ok() const
{
return m_ok;
}
/**
* Get immediate parent for document.
*
* This is not in general the same as the "parent" document used
* with Rcl::Db::addOrUpdate(). The latter is the enclosing file,
* this would be for exemple the email containing the attachment.
*/
static bool getEnclosing(const string &url, const string &ipath,
string &eurl, string &eipath, string& udi);
/** Return last element in ipath, like basename */
static std::string getLastIpathElt(const std::string& ipath);
/**
* Build sig for doc coming from rcldb. This is here because we know how
* to query the right backend. Used to check up-to-dateness at query time */
static bool makesig(RclConfig *cnf, const Rcl::Doc& idoc, string& sig);
/** Extract internal document into temporary file.
* This is used mainly for starting an external viewer for a
* subdocument (ie: mail attachment). This really would not need to be
* a member. It creates a FileInterner object to do the actual work
* @return true for success.
* @param temp output reference-counted temp file object (goes
* away magically). Only used if tofile.empty()
* @param tofile output file if not empty.
* @param cnf The recoll config
* @param doc Doc data taken from the index. We use it to construct a
* FileInterner object.
*/
static bool idocToFile(TempFile& temp, const string& tofile,
RclConfig *cnf, const Rcl::Doc& doc);
/**
* Does file appear to be the compressed version of a document?
*/
static bool isCompressed(const string& fn, RclConfig *cnf);
/**
* Check input compressed, allocate temp file and uncompress if it is.
* @return true if ok, false for error. Actual decompression is indicated
* by the TempFile status (!isNull())
*/
static bool maybeUncompressToTemp(TempFile& temp, const string& fn,
RclConfig *cnf, const Rcl::Doc& doc);
private:
static const unsigned int MAXHANDLERS = 20;
RclConfig *m_cfg;
string m_fn;
string m_mimetype; // Mime type for [uncompressed] file
bool m_forPreview;
string m_html; // Possibly set-aside html text for preview
TempFile m_imgtmp; // Possible reference to an image temp file
string m_targetMType;
string m_reachedMType; // target or text/plain
string m_tfile;
bool m_ok; // Set after construction if ok
#ifdef RCL_USE_XATTR
// Fields found in file extended attributes. This is kept here,
// not in the file-level handler because we are only interested in
// the top-level file, not any temp file necessitated by
// processing the internal doc hierarchy.
map<string, string> m_XAttrsFields;
#endif // RCL_USE_XATTR
// Filter stack, path to the current document from which we're
// fetching subdocs
vector<RecollFilter*> m_handlers;
// Temporary files used for decoding the current stack
bool m_tmpflgs[MAXHANDLERS];
vector<TempFile> m_tempfiles;
// Error data if any
string m_reason;
FIMissingStore *m_missingdatap;
Uncomp m_uncomp;
// Pseudo-constructors
void init(const string &fn, const struct stat *stp,
RclConfig *cnf, int flags, const string *mtype = 0);
void init(const string &data, RclConfig *cnf, int flags,
const string& mtype);
void initcommon(RclConfig *cnf, int flags);
bool dijontorcl(Rcl::Doc&);
void collectIpathAndMT(Rcl::Doc&) const;
TempFile dataToTempFile(const string& data, const string& mt);
void popHandler();
int addHandler();
void checkExternalMissing(const string& msg, const string& mt);
void processNextDocError(Rcl::Doc &doc);
#ifdef RCL_USE_XATTR
void reapXAttrs(const string& fn);
#endif
};
#endif /* _INTERNFILE_H_INCLUDED_ */