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DjVuDocument.cpp
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DjVuDocument.cpp
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//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, either Version 2 of the license,
//C- or (at your option) any later version. 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 from
//C- Lizardtech Software. Lizardtech Software has authorized us to
//C- replace the original DjVu(r) Reference Library notice by the following
//C- text (see doc/lizard2002.djvu and doc/lizardtech2007.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, either Version 2 of the license,
//C- | or (at your option) any later version. 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: DjVuDocument.cpp,v 1.21 2008/08/05 20:50:35 bpearlmutter Exp $
// $Name: $
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#if NEED_GNUG_PRAGMAS
# pragma implementation
#endif
#include "DjVuDocument.h"
#include "DjVmDoc.h"
#include "DjVmDir0.h"
#include "DjVmNav.h"
#include "DjVuNavDir.h"
#include "DjVuImage.h"
#include "DjVuFileCache.h"
#include "IFFByteStream.h"
#include "GOS.h"
#include "DataPool.h"
#include "IW44Image.h"
#include "GRect.h"
#include "debug.h"
#if defined(__linux__) || defined(LINUX)
typedef unsigned int UINT;
#endif
#include <algorithm>
#ifdef HAVE_NAMESPACES
namespace DJVU {
# ifdef NOT_DEFINED // Just to fool emacs c++ mode
}
#endif
#endif
static const char octets[4]={0x41,0x54,0x26,0x54};
const float DjVuDocument::thumb_gamma=(float)2.20;
void (* DjVuDocument::djvu_import_codec)(
GP<DataPool> &pool, const GURL &url, bool &needs_compression,
bool &needs_rename )=0;
void (* DjVuDocument::djvu_compress_codec)(
GP<ByteStream> &doc,const GURL &where,bool bundled)=0;
void
DjVuDocument::set_import_codec(
void (*codec)(
GP<DataPool> &pool, const GURL &url, bool &needs_compression, bool &needs_rename ))
{
djvu_import_codec=codec;
}
void
DjVuDocument::set_compress_codec(
void (* codec)(
GP<ByteStream> &doc,const GURL &where,bool bundled))
{
djvu_compress_codec=codec;
}
DjVuDocument::DjVuDocument(void)
: doc_type(UNKNOWN_TYPE),
needs_compression_flag(false),
can_compress_flag(false),
needs_rename_flag(false),
has_url_names(false),
recover_errors(ABORT),
verbose_eof(false),
init_started(false),
cache(0)
{
}
GP<DjVuDocument>
DjVuDocument::create(
GP<DataPool> pool, GP<DjVuPort> xport, DjVuFileCache * const xcache)
{
DjVuDocument *doc=new DjVuDocument;
GP<DjVuDocument> retval=doc;
doc->init_data_pool=pool;
doc->start_init(GURL(),xport,xcache);
return retval;
}
GP<DjVuDocument>
DjVuDocument::create(
const GP<ByteStream> &bs, GP<DjVuPort> xport, DjVuFileCache * const xcache)
{
return create(DataPool::create(bs),xport,xcache);
}
GP<DjVuDocument>
DjVuDocument::create_wait(
const GURL &url, GP<DjVuPort> xport, DjVuFileCache * const xcache)
{
GP<DjVuDocument> retval=create(url,xport,xcache);
retval->wait_for_complete_init();
return retval;
}
void
DjVuDocument::start_init(
const GURL & url, GP<DjVuPort> xport, DjVuFileCache * xcache)
{
DEBUG_MSG("DjVuDocument::start_init(): initializing class...\n");
DEBUG_MAKE_INDENT(3);
if (init_started)
G_THROW( ERR_MSG("DjVuDocument.2nd_init") );
if (!get_count())
G_THROW( ERR_MSG("DjVuDocument.not_secure") );
if(url.is_empty())
{
if (!init_data_pool)
G_THROW( ERR_MSG("DjVuDocument.empty_url") );
if(init_url.is_empty())
{
init_url=invent_url("document.djvu");
}
}else
{
init_url=url;
}
// Initialize
cache=xcache;
doc_type=UNKNOWN_TYPE;
DjVuPortcaster * pcaster=get_portcaster();
if (!xport)
xport=simple_port=new DjVuSimplePort();
pcaster->add_route(this, xport);
pcaster->add_route(this, this);
if(!url.is_empty())
{
init_data_pool=pcaster->request_data(this, init_url);
if(init_data_pool)
{
if(!init_url.is_empty() && init_url.is_local_file_url() && djvu_import_codec)
{
djvu_import_codec(init_data_pool,init_url,needs_compression_flag,needs_rename_flag);
}
if(needs_rename_flag)
can_compress_flag=true;
}
if (!init_data_pool)
{
G_THROW( ERR_MSG("DjVuDocument.fail_URL") "\t"+init_url.get_string());
}
}
// Now we say it is ready
init_started=true;
init_thread_flags=STARTED;
init_life_saver=this;
init_thr.create(static_init_thread, this);
}
DjVuDocument::~DjVuDocument(void)
{
// No more messages, please. We're being destroyed.
get_portcaster()->del_port(this);
// We want to stop any DjVuFile which has been created by us
// and is still being decoded. We have to stop them manually because
// they keep the "life saver" in the decoding thread and won't stop
// when we clear the last reference to them
{
GCriticalSectionLock lock(&ufiles_lock);
for(GPosition pos=ufiles_list;pos;++pos)
{
GP<DjVuFile> file=ufiles_list[pos]->file;
file->stop_decode(false);
file->stop(false); // Disable any access to data
}
ufiles_list.empty();
}
GPList<DjVuPort> ports=get_portcaster()->prefix_to_ports(get_int_prefix());
for(GPosition pos=ports;pos;++pos)
{
GP<DjVuPort> port=ports[pos];
if (port->inherits("DjVuFile"))
{
DjVuFile * file=(DjVuFile *) (DjVuPort *) port;
file->stop_decode(false);
file->stop(false); // Disable any access to data
}
}
DataPool::close_all();
//< Changed for WinDjView project
if (init_data_pool)
init_data_pool->clear_stream(true);
//>
}
void
DjVuDocument::stop_init(void)
{
DEBUG_MSG("DjVuDocument::stop_init(): making sure that the init thread dies.\n");
DEBUG_MAKE_INDENT(3);
GMonitorLock lock(&init_thread_flags);
while((init_thread_flags & STARTED) &&
!(init_thread_flags & FINISHED))
{
if (init_data_pool) init_data_pool->stop(true); // blocking operation
if (ndir_file) ndir_file->stop(false);
{
GCriticalSectionLock lock(&ufiles_lock);
for(GPosition pos=ufiles_list;pos;++pos)
ufiles_list[pos]->file->stop(false); // Disable any access to data
ufiles_list.empty();
}
init_thread_flags.wait(50);
}
}
void
DjVuDocument::check() const
{
if (!init_started)
G_THROW( ERR_MSG("DjVuDocument.not_init") );
}
void
DjVuDocument::static_init_thread(void * cl_data)
{
DjVuDocument * th=(DjVuDocument *) cl_data;
GP<DjVuDocument> life_saver=th;
th->init_life_saver=0;
G_TRY {
th->init_thread();
} G_CATCH(exc) {
G_TRY {
int changed = DjVuDocument::DOC_INIT_FAILED;
th->flags |= changed;
get_portcaster()->notify_doc_flags_changed(th, changed, 0);
} G_CATCH_ALL {
} G_ENDCATCH;
G_TRY {
th->check_unnamed_files();
if (!exc.cmp_cause(ByteStream::EndOfFile) && th->verbose_eof)
get_portcaster()->notify_error(th, ERR_MSG("DjVuDocument.init_eof"));
else if (!exc.cmp_cause(DataPool::Stop))
get_portcaster()->notify_status(th, ERR_MSG("DjVuDocument.stopped"));
else
get_portcaster()->notify_error(th, exc.get_cause());
} G_CATCH_ALL {
} G_ENDCATCH;
th->init_thread_flags |= FINISHED;
} G_ENDCATCH;
}
void
DjVuDocument::init_thread(void)
// This function is run in a separate thread.
// The goal is to detect the document type (BUNDLED, OLD_INDEXED, etc.)
// and decode navigation directory.
{
DEBUG_MSG("DjVuDocument::init_thread(): guessing what we're dealing with\n");
DEBUG_MAKE_INDENT(3);
DjVuPortcaster * pcaster=get_portcaster();
GP<ByteStream> stream=init_data_pool->get_stream();
GP<IFFByteStream> giff=IFFByteStream::create(stream);
IFFByteStream &iff=*giff;
GUTF8String chkid;
int size=iff.get_chunk(chkid);
if (!size)
G_THROW( ByteStream::EndOfFile );
if (size < 0)
G_THROW( ERR_MSG("DjVuDocument.no_file") );
if (size<8)
G_THROW( ERR_MSG("DjVuDocument.not_DjVu") );
if (chkid=="FORM:DJVM")
{
DEBUG_MSG("Got DJVM document here\n");
DEBUG_MAKE_INDENT(3);
size=iff.get_chunk(chkid);
if (chkid=="DIRM")
{
djvm_dir=DjVmDir::create();
djvm_dir->decode(iff.get_bytestream());
iff.close_chunk();
if (djvm_dir->is_bundled())
{
DEBUG_MSG("Got BUNDLED file.\n");
doc_type=BUNDLED;
}
else
{
DEBUG_MSG("Got INDIRECT file.\n");
doc_type=INDIRECT;
}
flags|=DOC_TYPE_KNOWN | DOC_DIR_KNOWN;
pcaster->notify_doc_flags_changed(this,
DOC_TYPE_KNOWN | DOC_DIR_KNOWN, 0);
check_unnamed_files();
/* Check for NAVM */
size=iff.get_chunk(chkid);
if (size && chkid=="NAVM")
{
djvm_nav=DjVmNav::create();
djvm_nav->decode(iff.get_bytestream());
iff.close_chunk();
}
}
else if (chkid=="DIR0")
{
DEBUG_MSG("Got OLD_BUNDLED file.\n");
doc_type=OLD_BUNDLED;
flags|=DOC_TYPE_KNOWN;
pcaster->notify_doc_flags_changed(this, DOC_TYPE_KNOWN, 0);
check_unnamed_files();
}
else
G_THROW( ERR_MSG("DjVuDocument.bad_format") );
if (doc_type==OLD_BUNDLED)
{
// Read the DjVmDir0 directory. We are unable to tell what
// files are pages and what are included at this point.
// We only know that the first file with DJVU (BM44 or PM44)
// form *is* the first page. The rest will become known
// after we decode DjVuNavDir
djvm_dir0=DjVmDir0::create();
djvm_dir0->decode(*iff.get_bytestream());
iff.close_chunk();
// Get offset to the first DJVU, PM44 or BM44 chunk
int first_page_offset=0;
while(!first_page_offset)
{
int offset;
size=iff.get_chunk(chkid, &offset);
if (size==0) G_THROW( ERR_MSG("DjVuDocument.no_page") );
if (chkid=="FORM:DJVU" ||
chkid=="FORM:PM44" || chkid=="FORM:BM44")
{
DEBUG_MSG("Got 1st page offset=" << offset << "\n");
first_page_offset=offset;
}
iff.close_chunk();
}
// Now get the name of this file
int file_num;
for(file_num=0;file_num<djvm_dir0->get_files_num();file_num++)
{
DjVmDir0::FileRec & file=*djvm_dir0->get_file(file_num);
if (file.offset==first_page_offset)
{
first_page_name=file.name;
break;
}
}
if (!first_page_name.length())
G_THROW( ERR_MSG("DjVuDocument.no_page") );
flags|=DOC_DIR_KNOWN;
pcaster->notify_doc_flags_changed(this, DOC_DIR_KNOWN, 0);
check_unnamed_files();
}
//< Changed for WinDjView project
// Read bookmarks
while (iff.get_chunk(chkid) != 0)
{
if (chkid == "NAVM")
{
djvm_nav = DjVmNav::create();
djvm_nav->decode(iff.get_bytestream());
iff.close_chunk();
break;
}
iff.close_chunk();
}
//>
}
else // chkid!="FORM:DJVM"
{
// DJVU format
DEBUG_MSG("Got DJVU OLD_INDEXED or SINGLE_PAGE document here.\n");
doc_type=SINGLE_PAGE;
flags |= DOC_TYPE_KNOWN;
pcaster->notify_doc_flags_changed(this, DOC_TYPE_KNOWN, 0);
check_unnamed_files();
}
if (doc_type==OLD_BUNDLED || doc_type==SINGLE_PAGE)
{
DEBUG_MSG("Searching for NDIR chunks...\n");
ndir_file=get_djvu_file(-1);
if (ndir_file) ndir=ndir_file->decode_ndir();
ndir_file=0; // Otherwise ~DjVuDocument() will stop (=kill) it
if (!ndir)
{
// Seems to be 1-page old-style document. Create dummy NDIR
if (doc_type==OLD_BUNDLED)
{
ndir=DjVuNavDir::create(GURL::UTF8("directory",init_url));
ndir->insert_page(-1, first_page_name);
}
else
{
ndir=DjVuNavDir::create(GURL::UTF8("directory",init_url.base()));
ndir->insert_page(-1, init_url.fname());
}
}
else
{
if (doc_type==SINGLE_PAGE)
doc_type=OLD_INDEXED;
}
flags|=DOC_NDIR_KNOWN;
pcaster->notify_doc_flags_changed(this, DOC_NDIR_KNOWN, 0);
check_unnamed_files();
}
flags |= DOC_INIT_OK;
pcaster->notify_doc_flags_changed(this, DOC_INIT_OK, 0);
check_unnamed_files();
init_thread_flags|=FINISHED;
DEBUG_MSG("DOCUMENT IS FULLY INITIALIZED now: doc_type='" <<
(doc_type==BUNDLED ? "BUNDLED" :
doc_type==OLD_BUNDLED ? "OLD_BUNDLED" :
doc_type==INDIRECT ? "INDIRECT" :
doc_type==OLD_INDEXED ? "OLD_INDEXED" :
doc_type==SINGLE_PAGE ? "SINGLE_PAGE" :
"UNKNOWN") << "'\n");
}
bool
DjVuDocument::wait_for_complete_init(void)
{
flags.enter();
while(!(flags & DOC_INIT_FAILED) &&
!(flags & DOC_INIT_OK)) flags.wait();
flags.leave();
init_thread_flags.enter();
while (!(init_thread_flags & FINISHED))
init_thread_flags.wait();
init_thread_flags.leave();
return (flags & (DOC_INIT_OK | DOC_INIT_FAILED))!=0;
}
int
DjVuDocument::wait_get_pages_num(void) const
{
GSafeFlags &f=const_cast<GSafeFlags &>(flags);
f.enter();
while(!(f & DOC_TYPE_KNOWN) &&
!(f & DOC_INIT_FAILED) &&
!(f & DOC_INIT_OK)) f.wait();
f.leave();
return get_pages_num();
}
GUTF8String
DjVuDocument::get_int_prefix(void) const
{
// These NAMEs are used to enable DjVuFile sharing inside the same
// DjVuDocument using DjVuPortcaster. Since URLs are unique to the
// document, other DjVuDocuments cannot retrieve files until they're
// assigned some permanent name. After '?' there should be the real
// file's URL. Please note, that output of this function is used only
// as name for DjVuPortcaster. Not as a URL.
GUTF8String retval;
return retval.format("document_%p%d?", this, hash(init_url));
}
void
DjVuDocument::set_file_aliases(const DjVuFile * file)
{
DEBUG_MSG("DjVuDocument::set_file_aliases(): setting global aliases for file '"
<< file->get_url() << "'\n");
DEBUG_MAKE_INDENT(3);
DjVuPortcaster * pcaster=DjVuPort::get_portcaster();
GMonitorLock lock(&((DjVuFile *) file)->get_safe_flags());
pcaster->clear_aliases(file);
if (file->is_decode_ok() && cache)
{
// If file is successfully decoded and caching is enabled,
// assign a global alias to this file, so that any other
// DjVuDocument will be able to use it.
pcaster->add_alias(file, file->get_url().get_string());
if (flags & (DOC_NDIR_KNOWN | DOC_DIR_KNOWN))
{
int page_num=url_to_page(file->get_url());
if (page_num>=0)
{
if (page_num==0) pcaster->add_alias(file, init_url.get_string()+"#-1");
pcaster->add_alias(file, init_url.get_string()+"#"+GUTF8String(page_num));
}
}
// The following line MUST stay here. For OLD_INDEXED documents
// a page may finish decoding before DIR or NDIR becomes known
// (multithreading, remember), so the code above would not execute
pcaster->add_alias(file, file->get_url().get_string()+"#-1");
} else pcaster->add_alias(file, get_int_prefix()+file->get_url());
}
void
DjVuDocument::check_unnamed_files(void)
{
DEBUG_MSG("DjVuDocument::check_unnamed_files(): Seeing if we can fix some...\n");
DEBUG_MAKE_INDENT(3);
if (flags & DOC_INIT_FAILED)
{
// Init failed. All unnamed files should be terminated
GCriticalSectionLock lock(&ufiles_lock);
for(GPosition pos=ufiles_list;pos;++pos)
{
GP<DjVuFile> file=ufiles_list[pos]->file;
file->stop_decode(true);
file->stop(false); // Disable any access to data
}
ufiles_list.empty();
return;
}
if ((flags & DOC_TYPE_KNOWN)==0)
return;
// See the list of unnamed files (created when there was insufficient
// information about DjVuDocument structure) and try to fix those,
// which can be fixed at this time
while(true)
{
DjVuPortcaster * pcaster=get_portcaster();
GP<UnnamedFile> ufile;
GURL new_url;
GPosition pos ;
GCriticalSectionLock lock(&ufiles_lock);
for(pos=ufiles_list;pos;)
{
G_TRY
{
GP<UnnamedFile> f=ufiles_list[pos];
if (f->id_type==UnnamedFile::ID)
new_url=id_to_url(f->id);
else
new_url=page_to_url(f->page_num);
if (!new_url.is_empty())
{
ufile=f;
// Don't take it off the list. We want to be
// able to stop the init from ~DjVuDocument();
//
// ufiles_list.del(pos);
break;
} else if (is_init_complete())
{
// No empty URLs are allowed at this point.
// We now know all information about the document
// and can determine if a page is inside it or not
f->data_pool->set_eof();
GUTF8String msg;
if (f->id_type==UnnamedFile::ID)
msg= ERR_MSG("DjVuDocument.miss_page_name") "\t"+f->id;
else
msg= ERR_MSG("DjVuDocument.miss_page_num") "\t"+GUTF8String(f->page_num);
G_THROW(msg);
}
++pos;
}
G_CATCH(exc)
{
pcaster->notify_error(this, exc.get_cause());
GP<DataPool> pool=ufiles_list[pos]->data_pool;
if (pool)
pool->stop();
GPosition this_pos=pos;
++pos;
ufiles_list.del(this_pos);
}
G_ENDCATCH;
}
if (ufile && !new_url.is_empty())
{
DEBUG_MSG("Fixing file: '" << ufile->url << "'=>'" << new_url << "'\n");
// Now, once we know its real URL we can request a real DataPool and
// can connect the DataPool owned by DjVuFile to that real one
// Note, that now request_data() will not play fool because
// we have enough information
G_TRY
{
if (ufile->data_pool)
{
GP<DataPool> new_pool=pcaster->request_data(ufile->file, new_url);
if(!new_pool)
G_THROW( ERR_MSG("DjVuDocument.fail_URL") "\t"+new_url.get_string());
ufile->data_pool->connect(new_pool);
}
ufile->file->set_name(new_url.fname());
ufile->file->move(new_url.base());
set_file_aliases(ufile->file);
}
G_CATCH(exc)
{
pcaster->notify_error(this, exc.get_cause());
}
G_ENDCATCH;
}
else
break;
// Remove the 'ufile' from the list
for(pos=ufiles_list;pos;++pos)
if (ufiles_list[pos]==ufile)
{
ufiles_list.del(pos);
break;
}
} // while(1)
}
int
DjVuDocument::get_pages_num(void) const
{
check();
if (flags & DOC_TYPE_KNOWN)
{
if (doc_type==BUNDLED || doc_type==INDIRECT)
return djvm_dir->get_pages_num();
else if (flags & DOC_NDIR_KNOWN)
return ndir->get_pages_num();
}
return 1;
}
GURL
DjVuDocument::page_to_url(int page_num) const
{
check();
DEBUG_MSG("DjVuDocument::page_to_url(): page_num=" << page_num << "\n");
DEBUG_MAKE_INDENT(3);
GURL url;
if (flags & DOC_TYPE_KNOWN)
switch(doc_type)
{
case SINGLE_PAGE:
{
if (page_num<1)
url=init_url;
else
G_THROW( ERR_MSG("DjVuDocument.big_num") );
break;
}
case OLD_INDEXED:
{
if (page_num<0)
url=init_url;
else if (flags & DOC_NDIR_KNOWN)
url=ndir->page_to_url(page_num);
break;
}
case OLD_BUNDLED:
{
if (page_num<0)
page_num=0;
if (page_num==0 && (flags & DOC_DIR_KNOWN))
url=GURL::UTF8(first_page_name,init_url);
else if (flags & DOC_NDIR_KNOWN)
url=ndir->page_to_url(page_num);
break;
}
case BUNDLED:
{
if (page_num<0)
page_num=0;
if (flags & DOC_DIR_KNOWN)
{
GP<DjVmDir::File> file=djvm_dir->page_to_file(page_num);
if (!file)
G_THROW( ERR_MSG("DjVuDocument.big_num") );
url=GURL::UTF8(file->get_load_name(),init_url);
}
break;
}
case INDIRECT:
{
if (page_num<0) page_num=0;
if (flags & DOC_DIR_KNOWN)
{
GP<DjVmDir::File> file=djvm_dir->page_to_file(page_num);
if (!file)
G_THROW( ERR_MSG("DjVuDocument.big_num") );
url=GURL::UTF8(file->get_load_name(),init_url.base());
}
break;
}
default:
G_THROW( ERR_MSG("DjVuDocument.unk_type") );
}
return url;
}
int
DjVuDocument::url_to_page(const GURL & url) const
{
check();
DEBUG_MSG("DjVuDocument::url_to_page(): url='" << url << "'\n");
DEBUG_MAKE_INDENT(3);
int page_num=-1;
if (flags & DOC_TYPE_KNOWN)
switch(doc_type)
{
case SINGLE_PAGE:
case OLD_BUNDLED:
case OLD_INDEXED:
{
if (flags & DOC_NDIR_KNOWN) page_num=ndir->url_to_page(url);
break;
}
case BUNDLED:
{
if (flags & DOC_DIR_KNOWN)
{
GP<DjVmDir::File> file;
if (url.base()==init_url)
file=djvm_dir->id_to_file(url.fname());
if (file)
page_num=file->get_page_num();
}
break;
}
case INDIRECT:
{
if (flags & DOC_DIR_KNOWN)
{
GP<DjVmDir::File> file;
if (url.base()==init_url.base())
file=djvm_dir->id_to_file(url.fname());
if (file)
page_num=file->get_page_num();
}
break;
}
default:
G_THROW( ERR_MSG("DjVuDocument.unk_type") );
}
return page_num;
}
GURL
DjVuDocument::id_to_url(const GUTF8String & id) const
{
check();
DEBUG_MSG("DjVuDocument::id_to_url(): translating ID='" << id << "' to URL\n");
DEBUG_MAKE_INDENT(3);
if (flags & DOC_TYPE_KNOWN)
switch(doc_type)
{
case BUNDLED:
if (flags & DOC_DIR_KNOWN)
{
GP<DjVmDir::File> file=djvm_dir->id_to_file(id);
if (!file)
{
file=djvm_dir->name_to_file(id);
if (!file)
file=djvm_dir->title_to_file(id);
}
if (file)
return GURL::UTF8(file->get_load_name(),init_url);
}
break;
case INDIRECT:
if (flags & DOC_DIR_KNOWN)
{
GP<DjVmDir::File> file=djvm_dir->id_to_file(id);
if (!file)
{
file=djvm_dir->name_to_file(id);
if (!file)
file=djvm_dir->title_to_file(id);
}
if (file)
return GURL::UTF8(file->get_load_name(),init_url.base());
}
break;
case OLD_BUNDLED:
if (flags & DOC_DIR_KNOWN)
{
GP<DjVmDir0::FileRec> frec=djvm_dir0->get_file(id);
if (frec)
return GURL::UTF8(id,init_url);
}
break;
case OLD_INDEXED:
case SINGLE_PAGE:
return GURL::UTF8(id,init_url.base());
break;
}
return GURL();
}
GURL
DjVuDocument::id_to_url(const DjVuPort * source, const GUTF8String &id)
{
return id_to_url(id);
}
GP<DjVuFile>
DjVuDocument::url_to_file(const GURL & url, bool dont_create) const
// This function is private and is called from two places:
// id_to_file() and get_djvu_file() ONLY when the structure is known
{
check();
DEBUG_MSG("DjVuDocument::url_to_file(): url='" << url << "'\n");
DEBUG_MAKE_INDENT(3);
// Try DjVuPortcaster to find existing files.
DjVuPortcaster * pcaster=DjVuPort::get_portcaster();
GP<DjVuPort> port;
if (cache)
{
// First - fully decoded files
port=pcaster->alias_to_port(url.get_string());
if (port && port->inherits("DjVuFile"))
{
DEBUG_MSG("found fully decoded file using DjVuPortcaster\n");
return (DjVuFile *) (DjVuPort *) port;
}
}
// Second - internal files
port=pcaster->alias_to_port(get_int_prefix()+url);
if (port && port->inherits("DjVuFile"))
{
DEBUG_MSG("found internal file using DjVuPortcaster\n");
return (DjVuFile *) (DjVuPort *) port;
}
GP<DjVuFile> file;
if (!dont_create)
{
DEBUG_MSG("creating a new file\n");
file=DjVuFile::create(url,const_cast<DjVuDocument *>(this),recover_errors,verbose_eof);
const_cast<DjVuDocument *>(this)->set_file_aliases(file);
}
return file;
}
GP<DjVuFile>
DjVuDocument::get_djvu_file(int page_num, bool dont_create) const
{
check();
DEBUG_MSG("DjVuDocument::get_djvu_file(): request for page " << page_num << "\n");
DEBUG_MAKE_INDENT(3);
DjVuPortcaster * pcaster=DjVuPort::get_portcaster();
GURL url;
{
// I'm locking the flags because depending on what page_to_url()
// returns me, I'll be creating DjVuFile in different ways.
// And I don't want the situation to change between the moment I call
// id_to_url() and I actually create DjVuFile
GMonitorLock lock(&(const_cast<DjVuDocument *>(this)->flags));
url=page_to_url(page_num);
if (url.is_empty())
{
// If init is complete and url is empty, we know for sure, that
// smth is wrong with the page_num. So we can return ZERO.
// Otherwise we create a temporary file and wait for init to finish
if (is_init_complete()) return 0;
DEBUG_MSG("Structure is not known => check <doc_url>#<page_num> alias...\n");
GP<DjVuPort> port;
if (cache)
port=pcaster->alias_to_port(init_url.get_string()+"#"+GUTF8String(page_num));
if (!port || !port->inherits("DjVuFile"))
{
DEBUG_MSG("failed => invent dummy URL and proceed\n");
// Invent some dummy temporary URL. I don't care what it will
// be. I'll remember the page_num and will generate the correct URL
// after I learn what the document is
GUTF8String name("page");
name+=GUTF8String(page_num);
name+=".djvu";
url=invent_url(name);
GCriticalSectionLock(&(const_cast<DjVuDocument *>(this)->ufiles_lock));
for(GPosition pos=ufiles_list;pos;++pos)
{
GP<UnnamedFile> f=ufiles_list[pos];
if (f->url==url) return f->file;
}
GP<UnnamedFile> ufile=new UnnamedFile(UnnamedFile::PAGE_NUM, 0,
page_num, url, 0);
// We're adding the record to the list before creating the DjVuFile
// because DjVuFile::init() will call request_data(), and the
// latter should be able to find the record.
//
// We also want to keep ufiles_lock to make sure that when
// request_data() is called, the record is still there
const_cast<DjVuDocument *>(this)->ufiles_list.append(ufile);
GP<DjVuFile> file=
DjVuFile::create(url,const_cast<DjVuDocument *>(this),recover_errors,verbose_eof);
ufile->file=file;
return file;
} else url=((DjVuFile *) (DjVuPort *) port)->get_url();
}
}
GP<DjVuFile> file=url_to_file(url, dont_create);
if (file)
pcaster->add_route(file, const_cast<DjVuDocument *>(this));
return file;
}
GURL
DjVuDocument::invent_url(const GUTF8String &name) const
{
GUTF8String buffer;
buffer.format("djvufileurl://%p/%s", this, (const char *)name);
return GURL::UTF8(buffer);