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tdegraphics/kviewshell/plugins/djvu/libdjvu/DjVmDir.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, 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.cpp,v 1.10 2004/05/05 15:12:42 leonb Exp $
// $Name: release_3_5_15 $
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#if NEED_GNUG_PRAGMAS
# pragma implementation
#endif
#include "DjVmDir.h"
#include "BSByteStream.h"
#include "GURL.h"
#include "debug.h"
#include <ctype.h>
#ifdef HAVE_NAMESPACES
namespace DJVU {
# ifdef NOT_DEFINED // Just to fool emacs c++ mode
}
#endif
#endif
GP<DjVmDir::File>
DjVmDir::File::create(const GUTF8String &load_name,
const GUTF8String &save_name, const GUTF8String &title,
const FILE_TYPE file_type)
{
File *file_ptr=new File();
GP<File> file=file_ptr;
file_ptr->set_load_name(load_name);
file_ptr->set_save_name(save_name);
file_ptr->set_title(title);
file_ptr->flags=(file_type & TYPE_MASK);
return file;
}
const GUTF8String &
DjVmDir::File::check_save_name(const bool xis_bundled)
{
if(!xis_bundled && !valid_name)
{
GUTF8String retval=name.length()?name:id;
if(GUTF8String(GNativeString(retval)) != retval)
{
const_cast<bool &>(valid_name)=true;
char *buf;
GPBuffer<char> gbuf(buf,2*retval.length()+1);
char *s=buf;
int i=0;
for(char c=retval[i++];c;)
{
static const char hex[]="0123456789ABCDEF";
int len=retval.nextChar(i)-i;
if(len>1 || ((len == 1)&&(c&0x80)))
{
do
{
s++[0]=hex[(c>>4)&0xf];
s++[0]=hex[(c&0xf)];
c=retval[i++];
} while(c && ((--len) > 0));
}else
{
s++[0]=c;
c=retval[i++];
}
}
s++[0]=0;
oldname=retval;
name=buf;
}
const_cast<bool &>(valid_name)=true;
}
return *(name.length()?&name:&id);
}
const GUTF8String &
DjVmDir::File::get_save_name(void) const
{
return *(name.length()?&name:&id);
}
void
DjVmDir::File::set_load_name(const GUTF8String &xid)
{
GURL url=GURL::UTF8(xid);
if(!url.is_valid())
{
url=GURL::Filename::UTF8(xid);
}
id=url.fname();
}
void
DjVmDir::File::set_save_name(const GUTF8String &xname)
{
GURL url;
valid_name=false;
if(!xname.length())
{
GURL url=GURL::UTF8(id);
if(!url.is_valid())
{
name=id;
}else
{
name=url.fname();
}
}else
{
GURL url=GURL::UTF8(xname);
if(!url.is_valid())
{
url=GURL::Filename::UTF8(xname);
}
name=url.fname();
}
oldname="";
}
/* DjVmDir::File */
DjVmDir::File::File(void) : offset(0), size(0), valid_name(false),
flags(0), page_num(-1) { }
GUTF8String
DjVmDir::File::get_str_type(void) const
{
GUTF8String type;
switch(flags & TYPE_MASK)
{
case INCLUDE:
type="INCLUDE";
break;
case PAGE:
type="PAGE";
break;
case THUMBNAILS:
type="THUMBNAILS";
break;
case SHARED_ANNO:
type="SHARED_ANNO";
break;
default:
// Internal error: please modify DjVmDir::File::get_str_type()
// to contain all possible File types.
G_THROW( ERR_MSG("DjVmDir.get_str_type") );
}
return type;
}
const int DjVmDir::version=1;
void
DjVmDir::decode(const GP<ByteStream> &gstr)
{
ByteStream &str=*gstr;
DEBUG_MSG("DjVmDir::decode(): decoding contents of 'DIRM' chunk...\n");
DEBUG_MAKE_INDENT(3);
GCriticalSectionLock lock(&class_lock);
GPosition pos;
files_list.empty();
page2file.resize(-1);
name2file.empty();
id2file.empty();
title2file.empty();
int ver=str.read8();
bool bundled=(ver & 0x80)!=0;
ver&=0x7f;
DEBUG_MSG("DIRM version=" << ver << ", our version=" << version << "\n");
if (ver>version)
G_THROW( ERR_MSG("DjVmDir.version_error") "\t"
+ GUTF8String(version) + "\t" + GUTF8String(ver));
// Unable to read DJVM directories of versions higher than xxx
// Data version number is yyy.
DEBUG_MSG("bundled directory=" << bundled << "\n");
DEBUG_MSG("reading the directory records...\n");
int files=str.read16();
DEBUG_MSG("number of files=" << files << "\n");
if (files)
{
DEBUG_MSG("reading offsets (and sizes for ver==0)\n");
for(int nfile=0;nfile<files;nfile++)
{
GP<File> file=new File();
files_list.append(file);
if (bundled)
{
file->offset=str.read32();
if (ver==0)
file->size=str.read24();
if (file->offset==0)
G_THROW( ERR_MSG("DjVmDir.no_indirect") );
} else
{
file->offset=file->size=0;
}
}
GP<ByteStream> gbs_str=BSByteStream::create(gstr);
ByteStream &bs_str=*gbs_str;
if (ver>0)
{
DEBUG_MSG("reading and decompressing sizes...\n");
for(GPosition pos=files_list;pos;++pos)
files_list[pos]->size=bs_str.read24();
}
DEBUG_MSG("reading and decompressing flags...\n");
for(pos=files_list;pos;++pos)
files_list[pos]->flags=bs_str.read8();
if (!ver)
{
DEBUG_MSG("converting flags from version 0...\n");
for(pos=files_list;pos;++pos)
{
unsigned char flags_0=files_list[pos]->flags;
unsigned char flags_1;
flags_1=(flags_0 & File::IS_PAGE_0)?(File::PAGE):(File::INCLUDE);
if (flags_0 & File::HAS_NAME_0)
flags_1|=File::HAS_NAME;
if (flags_0 & File::HAS_TITLE_0)
flags_1|=File::HAS_TITLE;
files_list[pos]->flags=flags_1;
}
}
DEBUG_MSG("reading and decompressing names...\n");
GTArray<char> strings;
char buffer[1024];
int length;
while((length=bs_str.read(buffer, 1024)))
{
int strings_size=strings.size();
strings.resize(strings_size+length-1);
memcpy((char*) strings+strings_size, buffer, length);
}
DEBUG_MSG("size of decompressed names block=" << strings.size() << "\n");
// Copy names into the files
const char * ptr=strings;
for(pos=files_list;pos;++pos)
{
GP<File> file=files_list[pos];
file->id=ptr;
ptr+=file->id.length()+1;
if (file->flags & File::HAS_NAME)
{
file->name=ptr;
ptr+=file->name.length()+1;
} else
{
file->name=file->id;
}
if (file->flags & File::HAS_TITLE)
{
file->title=ptr;
ptr+=file->title.length()+1;
} else
file->title=file->id;
/* msr debug: multipage file, file->title is null.
DEBUG_MSG(file->name << ", " << file->id << ", " << file->title << ", " <<
file->offset << ", " << file->size << ", " <<
file->is_page() << "\n"); */
}
// Check that there is only one file with SHARED_ANNO flag on
int shared_anno_cnt=0;
for(pos=files_list;pos;++pos)
{
if (files_list[pos]->is_shared_anno())
{
shared_anno_cnt++;
}
}
if (shared_anno_cnt>1)
G_THROW( ERR_MSG("DjVmDir.corrupt") );
// Now generate page=>file array for direct access
int pages=0;
for(pos=files_list;pos;++pos)
pages+=files_list[pos]->is_page() ? 1 : 0;
DEBUG_MSG("got " << pages << " pages\n");
page2file.resize(pages-1);
int page_num=0;
for(pos=files_list;pos;++pos)
{
GP<File> file=files_list[pos];
if (file->is_page())
{
page2file[page_num]=file;
file->page_num=page_num++;
}
}
// Generate name2file map
for(pos=files_list;pos;++pos)
{
GP<File> file=files_list[pos];
if (name2file.contains(file->name))
G_THROW( ERR_MSG("DjVmDir.dupl_name") "\t" + file->name );
name2file[file->name]=file;
}
// Generate id2file map
for(pos=files_list;pos;++pos)
{
GP<File> file=files_list[pos];
if (id2file.contains(file->id))
G_THROW( ERR_MSG("DjVmDir.dupl_id") "\t" + file->id);
id2file[file->id]=file;
}
// Generate title2file map
for(pos=files_list;pos;++pos)
{
GP<File> file=files_list[pos];
if (file->title.length())
{
if (title2file.contains(file->title))
G_THROW( ERR_MSG("DjVmDir.dupl_title") "\t" + file->title);
title2file[file->title]=file;
}
}
}
}
void
DjVmDir::encode(const GP<ByteStream> &gstr, const bool do_rename) const
{
bool bundled = true;
GPosition pos = files_list;
if (files_list.size() && !files_list[pos]->offset)
bundled = false;
for (pos=files_list; pos; ++pos)
if ( !bundled != !files_list[pos]->offset)
// There directory contains both indirect and bundled records.
G_THROW( ERR_MSG("DjVmDir.bad_dir") );
// Do the real work
encode(gstr, bundled, do_rename);
}
void
DjVmDir::encode(const GP<ByteStream> &gstr, const bool bundled, const bool do_rename) const
{
ByteStream &str=*gstr;
DEBUG_MSG("DjVmDir::encode(): encoding contents of the 'DIRM' chunk do_rename=" << do_rename << "\n");
DEBUG_MAKE_INDENT(3);
GCriticalSectionLock lock((GCriticalSection *) &class_lock);
GPosition pos;
DEBUG_MSG("encoding version number=" << version << ", bundled=" << bundled << "\n");
str.write8(version | ((int) bundled<< 7));
DEBUG_MSG("storing the number of records=" << files_list.size() << "\n");
str.write16(files_list.size());
if (files_list.size())
{
// Check that there is only one file with shared annotations
int shared_anno_cnt=0;
for (pos=files_list; pos; ++pos)
if (files_list[pos]->is_shared_anno())
shared_anno_cnt++;
if (shared_anno_cnt>1)
G_THROW( ERR_MSG("DjVmDir.multi_save") );
if (bundled)
{
// We need to store offsets uncompressed. That's because when
// we save a DjVmDoc, we first compress the DjVmDir with dummy
// offsets and after computing the real offsets we rewrite the
// DjVmDir, which should not change its size during this operation
DEBUG_MSG("storing offsets for every record\n");
for (pos=files_list; pos; ++pos)
{
GP<File> file=files_list[pos];
if (!file->offset)
// The directory contains record without offset
G_THROW( ERR_MSG("DjVmDir.bad_dir") );
str.write32(file->offset);
}
}
GP<ByteStream> gbs_str=BSByteStream::create(gstr, 50);
ByteStream &bs_str=*gbs_str;
DEBUG_MSG("storing and compressing sizes for every record\n");
for (pos=files_list; pos; ++pos)
{
const GP<File> file(files_list[pos]);
bs_str.write24(file->size);
}
DEBUG_MSG("storing and compressing flags for every record\n");
const bool xdo_rename=(do_rename||!bundled);
for(pos=files_list;pos;++pos)
{
const GP<File> file(files_list[pos]);
if(xdo_rename)
{
const GUTF8String new_id = file->name;
if (! new_id)
if(!file->oldname.length() || file->oldname == new_id)
file->flags &= ~File::HAS_NAME;
else
file->flags |= File::HAS_NAME;
}
else
{
if (!file->name.length() || file->name == file->id)
file->flags &= ~File::HAS_NAME;
else
file->flags |= File::HAS_NAME;
}
if (file->title.length() && (file->title!=file->id))
file->flags |= File::HAS_TITLE;
else
file->flags &= ~File::HAS_TITLE;
bs_str.write8(file->flags);
}
DEBUG_MSG("storing and compressing names...\n");
for(pos=files_list;pos;++pos)
{
GP<File> file=files_list[pos];
GUTF8String id;
GUTF8String name;
GUTF8String title;
if (xdo_rename)
{
id = file->name;
if (! id)
id = file->id;
if ((file->flags) & File::HAS_NAME)
name = file->oldname;
}
else
{
id=file->id;
if ((file->flags) & File::HAS_NAME)
name = file->name;
}
if ((file->flags) & File::HAS_TITLE)
title = file->title;
DEBUG_MSG("rename=" <<xdo_rename<<" id='" << id << "' name='" << name << "' title='" << title << "'\n");
bs_str.writestring(id);
bs_str.write8(0);
if (name.length())
{
bs_str.writestring(name);
bs_str.write8(0);
}
if (title.length())
{
bs_str.writestring(title);
bs_str.write8(0);
}
}
}
DEBUG_MSG("done\n");
}
GP<DjVmDir::File>
DjVmDir::page_to_file(int page_num) const
{
GCriticalSectionLock lock((GCriticalSection *) &class_lock);
return (page_num<page2file.size())?page2file[page_num]:(GP<DjVmDir::File>(0));
}
GP<DjVmDir::File>
DjVmDir::name_to_file(const GUTF8String & name) const
{
GCriticalSectionLock lock((GCriticalSection *) &class_lock);
GPosition pos;
return (name2file.contains(name, pos))?name2file[pos]:(GP<DjVmDir::File>(0));
}
GP<DjVmDir::File>
DjVmDir::id_to_file(const GUTF8String &id) const
{
GCriticalSectionLock lock((GCriticalSection *) &class_lock);
GPosition pos;
return (id2file.contains(id, pos))?id2file[pos]:(GP<DjVmDir::File>(0));
}
GP<DjVmDir::File>
DjVmDir::title_to_file(const GUTF8String &title) const
{
GCriticalSectionLock lock((GCriticalSection *) &class_lock);
GPosition pos;
return (title2file.contains(title, pos))?title2file[pos]:(GP<DjVmDir::File>(0));
}
GPList<DjVmDir::File>
DjVmDir::get_files_list(void) const
{
GCriticalSectionLock lock((GCriticalSection *) &class_lock);
return files_list;
}
int
DjVmDir::get_files_num(void) const
{
GCriticalSectionLock lock((GCriticalSection *) &class_lock);
return files_list.size();
}
int
DjVmDir::get_pages_num(void) const
{
GCriticalSectionLock lock((GCriticalSection *) &class_lock);
return page2file.size();
}
int
DjVmDir::get_file_pos(const File * f) const
{
GCriticalSectionLock lock((GCriticalSection *) &class_lock);
int cnt;
GPosition pos;
for(pos=files_list, cnt=0;pos&&(files_list[pos]!=f);++pos, cnt++)
continue;
return (pos)?cnt:(-1);
}
int
DjVmDir::get_page_pos(int page_num) const
{
GCriticalSectionLock lock((GCriticalSection *) &class_lock);
GP<File> file=page_to_file(page_num);
return (file)?get_file_pos(file):(-1);
}
GP<DjVmDir::File>
DjVmDir::get_shared_anno_file(void) const
{
GCriticalSectionLock lock((GCriticalSection *) &class_lock);
GP<File> file;
for(GPosition pos=files_list;pos;++pos)
{
GP<File> frec=files_list[pos];
if (frec->is_shared_anno())
{
file=frec;
break;
}
}
return file;
}
int
DjVmDir::insert_file(const GP<File> & file, int pos_num)
{
DEBUG_MSG("DjVmDir::insert_file(): name='" << file->name << "', pos=" << pos_num << "\n");
DEBUG_MAKE_INDENT(3);
GCriticalSectionLock lock((GCriticalSection *) &class_lock);
if (pos_num<0)
pos_num=files_list.size();
// Modify maps
// if (! File::is_legal_id(file->id))
// G_THROW( ERR_MSG("DjVmDir.bad_file") "\t" + file->id);
if (id2file.contains(file->id))
G_THROW( ERR_MSG("DjVmDir.dupl_id2") "\t" + file->id);
if (name2file.contains(file->name))
G_THROW( ERR_MSG("DjVmDir.dupl_name2") "\t" + file->name);
name2file[file->name]=file;
id2file[file->id]=file;
if (file->title.length())
{
if (title2file.contains(file->title)) // duplicate titles may become ok some day
G_THROW( ERR_MSG("DjVmDir.dupl_title2") "\t" + file->title);
title2file[file->title]=file;
}
// Make sure that there is no more than one file with shared annotations
if (file->is_shared_anno())
{
for(GPosition pos=files_list;pos;++pos)
if (files_list[pos]->is_shared_anno())
G_THROW( ERR_MSG("DjVmDir.multi_save2") );
}
// Add the file to the list
int cnt;
GPosition pos;
for(pos=files_list, cnt=0;pos&&(cnt!=pos_num);++pos, cnt++)
continue;
if (pos)
files_list.insert_before(pos, file);
else
files_list.append(file);
if (file->is_page())
{
// This file is also a page
// Count its number
int page_num=0;
for(pos=files_list;pos;++pos)
{
GP<File> &f=files_list[pos];
if (f==file)
break;
if (f->is_page())
page_num++;
}
int i;
page2file.resize(page2file.size());
for(i=page2file.size()-1;i>page_num;i--)
page2file[i]=page2file[i-1];
page2file[page_num]=file;
for(i=page_num;i<page2file.size();i++)
page2file[i]->page_num=i;
}
return pos_num;
}
void
DjVmDir::delete_file(const GUTF8String &id)
{
DEBUG_MSG("Deleting file with id='" << (const char *)id << "'\n");
DEBUG_MAKE_INDENT(3);
GCriticalSectionLock lock((GCriticalSection *) &class_lock);
for(GPosition pos=files_list;pos;++pos)
{
GP<File> & f=files_list[pos];
if (id == f->id)
{
name2file.del(f->name);
id2file.del(f->id);
title2file.del(f->title);
if (f->is_page())
{
for(int page=0;page<page2file.size();page++)
{
if (page2file[page]==f)
{
int i;
for(i=page;i<page2file.size()-1;i++)
page2file[i]=page2file[i+1];
page2file.resize(page2file.size()-2);
for(i=page;i<page2file.size();i++)
page2file[i]->page_num=i;
break;
}
}
}
files_list.del(pos);
break;
}
}
}
void
DjVmDir::set_file_name(const GUTF8String &id, const GUTF8String &name)
{
DEBUG_MSG("DjVmDir::set_file_name(): id='" << id << "', name='" << name << "'\n");
DEBUG_MAKE_INDENT(3);
GCriticalSectionLock lock((GCriticalSection *) &class_lock);
GPosition pos;
// First see, if the name is unique
for(pos=files_list;pos;++pos)
{
GP<File> file=files_list[pos];
if (file->id!=id && file->name==name)
G_THROW( ERR_MSG("DjVmDir.name_in_use") "\t" + GUTF8String(name));
}
// Check if ID is valid
if (!id2file.contains(id, pos))
G_THROW( ERR_MSG("DjVmDir.no_info") "\t" + GUTF8String(id));
GP<File> file=id2file[pos];
name2file.del(file->name);
file->name=name;
name2file[name]=file;
}
void
DjVmDir::set_file_title(const GUTF8String &id, const GUTF8String &title)
{
DEBUG_MSG("DjVmDir::set_file_title(): id='" << id << "', title='" << title << "'\n");
DEBUG_MAKE_INDENT(3);
GCriticalSectionLock lock((GCriticalSection *) &class_lock);
GPosition pos;
// First see, if the title is unique
for(pos=files_list;pos;++pos)
{
GP<File> file=files_list[pos];
if (file->id!=id && file->title==title)
G_THROW( ERR_MSG("DjVmDir.title_in_use") "\t" + GUTF8String(title));
}
// Check if ID is valid
if (!id2file.contains(id, pos))
G_THROW( ERR_MSG("DjVmDir.no_info") "\t" + GUTF8String(id));
GP<File> file=id2file[pos];
title2file.del(file->title);
file->title=title;
title2file[title]=file;
}
GPList<DjVmDir::File>
DjVmDir::resolve_duplicates(const bool save_as_bundled)
{
GCriticalSectionLock lock((GCriticalSection *) &class_lock);
// Make sure all the filenames are unique.
GPosition pos;
GMap<GUTF8String,void *> save_map;
GMap<GUTF8String,GPList<DjVmDir::File> > conflicts;
for(pos=files_list;pos;++pos)
{
const GUTF8String save_name=files_list[pos]->check_save_name(save_as_bundled).downcase();
if(save_map.contains(save_name))
{
conflicts[save_name].append(files_list[pos]);
}else
{
save_map[save_name]=0;
}
}
for(pos=conflicts;pos;++pos)
{
const GUTF8String &save_name=conflicts.key(pos);
const int dot=save_name.rsearch('.',0);
GPList<DjVmDir::File> &cfiles=conflicts[pos];
int count=1;
for(GPosition qpos=cfiles;qpos;++qpos)
{
GUTF8String new_name=cfiles[qpos]->get_load_name();
if((new_name != GUTF8String(GNativeString(new_name)))
||conflicts.contains(new_name))
{
do
{
new_name=(dot<0)
?(save_name+"-"+GUTF8String(count++))
:(save_name.substr(0,dot)+"-"+GUTF8String(count++)+
save_name.substr(dot,(unsigned int)(-1)));
} while(save_map.contains(new_name.downcase()));
}
cfiles[qpos]->set_save_name(new_name);
save_map[new_name]=0;
}
}
return files_list;
}
#ifdef HAVE_NAMESPACES
}
# ifndef NOT_USING_DJVU_NAMESPACE
using namespace DJVU;
# endif
#endif
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