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Diffstat (limited to 'kviewshell/plugins/djvu/libdjvu/DjVmDir.h')
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diff --git a/kviewshell/plugins/djvu/libdjvu/DjVmDir.h b/kviewshell/plugins/djvu/libdjvu/DjVmDir.h new file mode 100644 index 00000000..86b661e3 --- /dev/null +++ b/kviewshell/plugins/djvu/libdjvu/DjVmDir.h @@ -0,0 +1,451 @@ +//C- -*- C++ -*- +//C- ------------------------------------------------------------------- +//C- DjVuLibre-3.5 +//C- Copyright (c) 2002 Leon Bottou and Yann Le Cun. +//C- Copyright (c) 2001 AT&T +//C- +//C- This software is subject to, and may be distributed under, the +//C- GNU General Public License, Version 2. The license should have +//C- accompanied the software or you may obtain a copy of the license +//C- from the Free Software Foundation at http://www.fsf.org . +//C- +//C- This program is distributed in the hope that it will be useful, +//C- but WITHOUT ANY WARRANTY; without even the implied warranty of +//C- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +//C- GNU General Public License for more details. +//C- +//C- DjVuLibre-3.5 is derived from the DjVu(r) Reference Library +//C- distributed by Lizardtech Software. On July 19th 2002, Lizardtech +//C- Software authorized us to replace the original DjVu(r) Reference +//C- Library notice by the following text (see doc/lizard2002.djvu): +//C- +//C- ------------------------------------------------------------------ +//C- | DjVu (r) Reference Library (v. 3.5) +//C- | Copyright (c) 1999-2001 LizardTech, Inc. All Rights Reserved. +//C- | The DjVu Reference Library is protected by U.S. Pat. No. +//C- | 6,058,214 and patents pending. +//C- | +//C- | This software is subject to, and may be distributed under, the +//C- | GNU General Public License, Version 2. The license should have +//C- | accompanied the software or you may obtain a copy of the license +//C- | from the Free Software Foundation at http://www.fsf.org . +//C- | +//C- | The computer code originally released by LizardTech under this +//C- | license and unmodified by other parties is deemed "the LIZARDTECH +//C- | ORIGINAL CODE." Subject to any third party intellectual property +//C- | claims, LizardTech grants recipient a worldwide, royalty-free, +//C- | non-exclusive license to make, use, sell, or otherwise dispose of +//C- | the LIZARDTECH ORIGINAL CODE or of programs derived from the +//C- | LIZARDTECH ORIGINAL CODE in compliance with the terms of the GNU +//C- | General Public License. This grant only confers the right to +//C- | infringe patent claims underlying the LIZARDTECH ORIGINAL CODE to +//C- | the extent such infringement is reasonably necessary to enable +//C- | recipient to make, have made, practice, sell, or otherwise dispose +//C- | of the LIZARDTECH ORIGINAL CODE (or portions thereof) and not to +//C- | any greater extent that may be necessary to utilize further +//C- | modifications or combinations. +//C- | +//C- | The LIZARDTECH ORIGINAL CODE is provided "AS IS" WITHOUT WARRANTY +//C- | OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED +//C- | TO ANY WARRANTY OF NON-INFRINGEMENT, OR ANY IMPLIED WARRANTY OF +//C- | MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. +//C- +------------------------------------------------------------------ +// +// $Id: DjVmDir.h,v 1.10 2003/11/07 22:08:20 leonb Exp $ +// $Name: release_3_5_15 $ + +#ifndef _DJVMDIR_H +#define _DJVMDIR_H +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif +#if NEED_GNUG_PRAGMAS +# pragma interface +#endif + + +/** @name DjVmDir.h + Files #"DjVmDir.h"# and #"DjVmDir.cpp"# implement class \Ref{DjVmDir} for + representing the directory of a DjVu multipage document. + + {\bf Bundled vs. Indirect format} --- There are currently two multipage + DjVu formats supported: {\em bundled} and {\em indirect}. In the first + format all component files composing a given document are packaged (or + bundled) into one file, in the second one every page and component is + stored in a separate file and there is one more file, which contains the + list of all others. + + {\bf Multipage DjVu format} --- Multipage DjVu documents follow the EA + IFF85 format (cf. \Ref{IFFByteStream.h}.) A document is composed of a + #"FORM:DJVM"# whose first chunk is a #"DIRM"# chunk containing the {\em + document directory}. This directory lists all component files composing + the given document, helps to access every component file and identify the + pages of the document. + \begin{itemize} + \item In a {\em bundled} multipage file, the component files + are stored immediately after the #"DIRM"# chunk, + within the #"FORM:DJVU"# composite chunk. + \item In an {\em indirect} multipage file, the component files are + stored in different files whose URLs are composed using information + stored in the #"DIRM"# chunk. + \end{itemize} + Most of the component files represent pages of a document. Some files + however represent data shared by several pages. The pages refer to these + supporting files by means of an inclusion chunk (#"INCL"# chunks) + identifying the supporting file. + + {\bf Document Directory} --- Every directory record describes a component + file. Each component file is identified by a small string named the + identifier (ID). Each component file also contains a file name and a + title. The format of the #"DIRM"# chunk is described in section + \Ref{Format of the DIRM chunk.}. + + Theoretically, IDs are used to uniquely identify each component file in + #"INCL"# chunks, names are used to compose the the URLs of the component + files in an indirect multipage DjVu file, and titles are cosmetic names + possibly displayed when viewing a page of a document. There are however + many problems with this scheme, and we {\em strongly suggest}, with the + current implementation to always make the file ID, the file name and the + file title identical. + + @memo Implements DjVu multipage document directory + @author Andrei Erofeev <eaf@geocities.com> + @version + #$Id: DjVmDir.h,v 1.10 2003/11/07 22:08:20 leonb Exp $# */ +//@{ + + + +#include "GString.h" +#include "GThreads.h" + +#ifdef HAVE_NAMESPACES +namespace DJVU { +# ifdef NOT_DEFINED // Just to fool emacs c++ mode +} +#endif +#endif + +class ByteStream; + +/** Implements DjVu multipage document directory. There are currently two + multipage DjVu formats supported: {\em bundled} and {\em indirect}. In + the first format all component files composing a given document are + packaged (or bundled) into one file, in the second one every page and + component is stored in a separate file and there is one more file, which + contains the list of all others. + + The multipage document directory lists all component files composing the + given document, helps to access every file, identify pages and maintain + user-specified shortcuts. Every directory record describes a file + composing the document. Each file is identified by a small string named + the identifier (ID). Each file may also contain a file name and a title. + + The #DjVmDir# class represents a multipage document directory. Its main + purpose is to encode and decode the document directory when writing or + reading the #DIRM# chunk. Normally you don't have to create this class + yourself. It's done automatically when \Ref{DjVmDoc} class initializes + itself. It may be useful though to be able to access records in the + directory because some classes (like \Ref{DjVuDocument} and \Ref{DjVmDoc}) + return a pointer to #DjVmDir# in some cases. */ + +class DjVmDir : public GPEnabled +{ +protected: + /** Class \Ref{DjVmDir::File} represents the directory records + managed by class \Ref{DjVmDir}. */ + DjVmDir(void) { } ; +public: + class File; + + static const int version; + + /** Class \Ref{DjVmDir::File} represents the directory records + managed by class \Ref{DjVmDir}. */ + static GP<DjVmDir> create(void) {return new DjVmDir; } ; + + /** Decodes the directory from the specified stream. */ + void decode(const GP<ByteStream> &stream); + /** Encodes the directory into the specified stream. */ + void encode(const GP<ByteStream> &stream, const bool do_rename=false) const; + /** Encodes the directory into the specified stream, explicitely as bundled or indirect. */ + void encode(const GP<ByteStream> &stream, const bool bundled, const bool do_rename) const; + /** Tests if directory defines an {\em indirect} document. */ + bool is_indirect(void) const; + /** Tests if the directory defines a {\em bundled} document. */ + bool is_bundled(void) const; + /** Translates page numbers to file records. */ + GP<File> page_to_file(int page_num) const; + /** Translates file names to file records. */ + GP<File> name_to_file(const GUTF8String & name) const; + /** Translates file IDs to file records. */ + GP<File> id_to_file(const GUTF8String &id) const; + /** Translates file shortcuts to file records. */ + GP<File> title_to_file(const GUTF8String &title) const; + /** Returns position of the file in the directory. */ + int get_file_pos(const File * f) const; + /** Returns position of the given page in the directory. */ + int get_page_pos(int page_num) const; + /** Check for duplicate names, and resolve them. */ + GPList<File> resolve_duplicates(const bool save_as_bundled); + /** Returns a copy of the list of file records. */ + GPList<File> get_files_list(void) const; + /** Returns the number of file records. */ + int get_files_num(void) const; + /** Returns the number of file records representing pages. */ + int get_pages_num(void) const; + /** Returns back pointer to the file with #SHARED_ANNO# flag. + Note that there may be only one file with shared annotations + in any multipage DjVu document. */ + GP<File> get_shared_anno_file(void) const; + /** Changes the title of the file with ID #id#. */ + void set_file_title(const GUTF8String &id, const GUTF8String &title); + /** Changes the name of the file with ID #id#. */ + void set_file_name(const GUTF8String &id, const GUTF8String &name); + /** Inserts the specified file record at the specified position. + Specifying #pos# equal to #-1# means to append. The actual position + inserted is returned. */ + int insert_file(const GP<File> & file, int pos=-1); + /** Removes a file record with ID #id#. */ + void delete_file(const GUTF8String &id); +private: + GCriticalSection class_lock; + GPList<File> files_list; + GPArray<File> page2file; + GPMap<GUTF8String, File> name2file; + GPMap<GUTF8String, File> id2file; + GPMap<GUTF8String, File> title2file; +private: //dummy stuff + static void decode(ByteStream *); + static void encode(ByteStream *); +}; + +class DjVmDir::File : public GPEnabled +{ +public: + // Out of the record: INCLUDE below must be zero and PAGE must be one. + // This is to avoid problems with the File constructor, which now takes + // 'int file_type' as the last argument instead of 'bool is_page' + + /** File type. Possible file types are: + \begin{description} + \item[PAGE] This is a top level page file. It may include other + #INCLUDE#d files, which may in turn be shared between + different pages. + \item[INCLUDE] This file is included into some other file inside + this document. + \item[THUMBNAILS] This file contains thumbnails for the document + pages. + \item[SHARED_ANNO] This file contains annotations shared by + all the pages. It's supposed to be included into every page + for the annotations to take effect. There may be only one + file with shared annotations in a document. + \end{description} */ + enum FILE_TYPE { INCLUDE=0, PAGE=1, THUMBNAILS=2, SHARED_ANNO=3 }; +protected: + /** Default constructor. */ + File(void); + +public: + static GP<File> create(void) { return new File(); } + static GP<File> create(const GUTF8String &load_name, + const GUTF8String &save_name, const GUTF8String &title, + const FILE_TYPE file_type); + + /** Check for filenames that are not valid for the native encoding, + and change them. */ + const GUTF8String &check_save_name(const bool as_bundled); + + /** File name. The optional file name must be unique and is the name + that will be used when the document is saved to an indirect file. + If not assigned, the value of #id# will be used for this purpose. + By keeping the name in {\em bundled} document we guarantee, that it + can be expanded later into {\em indirect} document and files will + still have the same names, if the name is legal on a given filesystem. + */ + const GUTF8String &get_save_name(void) const; + + /** File identifier. The encoder assigns a unique identifier to each file + in a multipage document. This is the name used when loading files. + Indirection chunks in other files (#"INCL"# chunks) may refer to another + file using its identifier. */ + const GUTF8String &get_load_name(void) const; + void set_load_name(const GUTF8String &id); + + /** File title. The file title is assigned by the user and may be used as + a shortcut for viewing a particular page. Names like #"chapter1"# or + #"appendix"# are appropriate. */ + const GUTF8String &get_title() const; + void set_title(const GUTF8String &id); + + /** Reports an ascii string indicating file type. */ + GUTF8String get_str_type(void) const; + + /** Offset of the file data in a bundled DJVM file. This number is + relevant in the {\em bundled} case only when everything is packed into + one single file. */ + int offset; + + /** Size of the file data in a bundled DJVM file. This number is + relevant in the {\em bundled} case only when everything is + packed into one single file. */ + int size; + + /** Have we checked the saved file name, to see if it is valid on the + local disk? */ + bool valid_name; + + /** Tests if this file represents a page of the document. */ + bool is_page(void) const + { + return (flags & TYPE_MASK)==PAGE; + } + + /** Returns #TRUE# if this file is included into some other files of + this document. */ + bool is_include(void) const + { + return (flags & TYPE_MASK)==INCLUDE; + } + + /** Returns #TRUE# if this file contains thumbnails for the document pages. */ + bool is_thumbnails(void) const + { + return (flags & TYPE_MASK)==THUMBNAILS; + } + + /** Returns the page number of this file. This function returns + #-1# if this file does not represent a page of the document. */ + bool is_shared_anno(void) const + { return (flags & TYPE_MASK)==SHARED_ANNO; } + + int get_page_num(void) const + { return page_num; } +protected: + GUTF8String name; + GUTF8String oldname; + GUTF8String id; + GUTF8String title; + void set_save_name(const GUTF8String &name); +private: + friend class DjVmDir; + enum FLAGS_0 { IS_PAGE_0=1, HAS_NAME_0=2, HAS_TITLE_0=4 }; + enum FLAGS_1 { HAS_NAME=0x80, HAS_TITLE=0x40, TYPE_MASK=0x3f }; + unsigned char flags; + int page_num; +}; + +inline const GUTF8String & +DjVmDir::File::get_load_name(void) const +{ return id; } + +inline const GUTF8String & +DjVmDir::File::get_title() const +{ return *(title.length()?&title:&id); } + +inline void +DjVmDir::File::set_title(const GUTF8String &xtitle) { title=xtitle; } + +/** @name Format of the DIRM chunk. + + {\bf Variants} --- There are two versions of the #"DIRM"# chunk format. + The version number is identified by the seven low bits of the first byte + of the chunk. Version {\bf 0} is obsolete and should never be used. This + section describes version {\bf 1}. There are two major multipage DjVu + formats supported: {\em bundled} and {\em indirect}. The #"DIRM"# chunk + indicates which format is used in the most significant bit of the first + byte of the chunk. The document is bundled when this bit is set. + Otherwise the document is indirect. + + {\bf Unencoded data} --- The #"DIRM"# chunk is composed some unencoded + data followed by \Ref{bzz} encoded data. The unencoded data starts with + the version byte and a 16 bit integer representing the number of component + files. All integers are encoded with the most significant byte first. + \begin{verbatim} + BYTE: Flags/Version: 0x<bundled>0000011 + INT16: Number of component files. + \end{verbatim} + When the document is a bundled document (i.e. the flag #bundled# is set), + this header is followed by the offsets of each of the component files within + the #"FORM:DJVM"#. These offsets allow for random component file access. + \begin{verbatim} + INT32: Offset of first component file. + INT32: Offset of second component file. + ... + INT32: Offset of last component file. + \end{verbatim} + + {\bf BZZ encoded data} --- The rest of the chunk is entirely compressed + with the BZZ general purpose compressor. We describe now the data fed + into (or retrieved from) the BZZ codec (cf. \Ref{BSByteStream}.) First + come the sizes and the flags associated with each component file. + \begin{verbatim} + INT24: Size of the first component file. + INT24: Size of the second component file. + ... + INT24: Size of the last component file. + BYTE: Flag byte for the first component file. + BYTE: Flag byte for the second component file. + ... + BYTE: Flag byte for the last component file. + \end{verbatim} + The flag bytes have the following format: + \begin{verbatim} + 0b<hasname><hastitle>000000 for a file included by other files. + 0b<hasname><hastitle>000001 for a file representing a page. + 0b<hasname><hastitle>000010 for a file containing thumbnails. + \end{verbatim} + Flag #hasname# is set when the name of the file is different from the file + ID. Flag #hastitle# is set when the title of the file is different from + the file ID. These flags are used to avoid encoding the same string three + times. Then come a sequence of zero terminated strings. There are one to + three such strings per component file. The first string contains the ID + of the component file. The second string contains the name of the + component file. It is only present when the flag #hasname# is set. The third + one contains the title of the component file. It is only present when the + flag #hastitle# is set. The \Ref{bzz} encoding system makes sure that + all these strings will be encoded efficiently despite their possible + redundancies. + \begin{verbatim} + ZSTR: ID of the first component file. + ZSTR: Name of the first component file (only if #hasname# is set.) + ZSTR: Title of the first component file (only if #hastitle# is set.) + ... + ZSTR: ID of the last component file. + ZSTR: Name of the last component file (only if #hasname# is set.) + ZSTR: Title of the last component file (only if #hastitle# is set.) + \end{verbatim} + + @memo Description of the format of the DIRM chunk. */ +//@} + + + +// -------------- IMPLEMENTATION + + +inline bool +DjVmDir::is_bundled(void) const +{ + return ! is_indirect(); +} + +inline bool +DjVmDir::is_indirect(void) const +{ + GCriticalSectionLock lock((GCriticalSection *) &class_lock); + return ( files_list.size() && files_list[files_list] != 0 && + files_list[files_list]->offset==0 ); +} + + + +// ----- THE END + +#ifdef HAVE_NAMESPACES +} +# ifndef NOT_USING_DJVU_NAMESPACE +using namespace DJVU; +# endif +#endif +#endif |