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tdegraphics/kviewshell/plugins/djvu/libdjvu/DjVuPort.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: DjVuPort.cpp,v 1.10 2003/11/07 22:08:21 leonb Exp $
// $Name: release_3_5_15 $
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#if NEED_GNUG_PRAGMAS
# pragma implementation
#endif
#include "DjVuPort.h"
#include "GOS.h"
#include "DjVuImage.h"
#include "DjVuDocument.h"
#include "DjVuFile.h"
#include "DjVuMessageLite.h"
#include "DataPool.h"
#ifdef HAVE_NAMESPACES
namespace DJVU {
# ifdef NOT_DEFINED // Just to fool emacs c++ mode
}
#endif
#endif
//****************************************************************************
//******************************* Globals ************************************
//****************************************************************************
static DjVuPortcaster *pcaster;
DjVuPortcaster *
DjVuPort::get_portcaster(void)
{
if (!pcaster) pcaster = new DjVuPortcaster();
return pcaster;
}
class DjVuPort::DjVuPortCorpse
{
public:
DjVuPort * port;
DjVuPortCorpse * next;
DjVuPortCorpse(DjVuPort * _port) : port(_port), next(0) {}
};
//****************************************************************************
//******************************* DjVuPort ***********************************
//****************************************************************************
#define MAX_CORPSE_NUM 128
// Last MAX_CORPSE_NUM addresses of dead DjVuPorts. We want to maintain this
// list because of the way DjVuPort::is_port_alive() works: it accepts an
// address and runs it thru its internal maps. The problem will occur if
// a new DjVuPort is created exactly on place of another one, which just
// died. Here we attempt to remember the last MAX_CORPSE_NUM addresses
// of dead DjVuPorts, and take them into account in DjVuPort::operator new();
GCriticalSection * DjVuPort::corpse_lock;
DjVuPort::DjVuPortCorpse * DjVuPort::corpse_head;
DjVuPort::DjVuPortCorpse * DjVuPort::corpse_tail;
int DjVuPort::corpse_num;
void *
DjVuPort::operator new (size_t sz)
{
if (!corpse_lock) corpse_lock=new GCriticalSection();
// Loop until we manage to allocate smth, which is not mentioned in
// the 'corpse' list. Thus we will avoid allocating a new DjVuPort
// on place of a dead one. Not *absolutely* secure (only 64 items
// in the list) but is still better than nothing.
void * addr=0;
{
GCriticalSectionLock lock(corpse_lock);
// Store here addresses, which were found in 'corpse' list.
// We will free then in the end
int addr_num=0;
static void * addr_arr[MAX_CORPSE_NUM];
// Make at most MAX_CORPSE_NUM attempts. During each attempt
// we try to allocate a block of memory for DjVuPort. If
// the address of this block is not in the corpse list, we break
// All addresses will be recorder, so that we can delete them
// after we're done.
for(int attempt=0;attempt<MAX_CORPSE_NUM;attempt++)
{
void * test_addr=::operator new (sz);
addr_arr[addr_num++]=test_addr;
// See if 'test_addr' is in the 'corpse' list (was recently used)
DjVuPortCorpse * corpse;
for(corpse=corpse_head;corpse;corpse=corpse->next)
if (test_addr==corpse->port) break;
if (!corpse)
{
addr=test_addr;
addr_num--;
break;
}
}
// If all attempts failed (all addresses generated are already
// in the list of corpses, allocate a new one and proceed
// w/o additional checks
if (!addr) addr=::operator new(sz);
// Here 'addr_arr[0<=i<addr_num]' contains addresses, that we
// tried to allocate, and which need to be freed now
// 'addr' contains address we want to use.
addr_num--;
while(addr_num>=0) ::operator delete(addr_arr[addr_num--]);
}
DjVuPortcaster * pcaster=get_portcaster();
GCriticalSectionLock lock(&pcaster->map_lock);
pcaster->cont_map[addr]=0;
return addr;
}
void
DjVuPort::operator delete(void * addr)
{
if (corpse_lock)
{
GCriticalSectionLock lock(corpse_lock);
// Add 'addr' to the list of corpses
if (corpse_tail)
{
corpse_tail->next=new DjVuPortCorpse((DjVuPort *) addr);
corpse_tail=corpse_tail->next;
corpse_tail->next=0;
} else
{
corpse_head=corpse_tail=new DjVuPortCorpse((DjVuPort *) addr);
corpse_tail->next=0;
}
corpse_num++;
if (corpse_num>=MAX_CORPSE_NUM)
{
DjVuPortCorpse * corpse=corpse_head;
corpse_head=corpse_head->next;
delete corpse;
corpse_num--;
}
}
::operator delete(addr);
}
DjVuPort::DjVuPort()
{
DjVuPortcaster *pcaster = get_portcaster();
GCriticalSectionLock lock(& pcaster->map_lock );
GPosition p = pcaster->cont_map.contains(this);
if (!p) G_THROW( ERR_MSG("DjVuPort.not_alloc") );
pcaster->cont_map[p] = (void*)this;
}
DjVuPort::DjVuPort(const DjVuPort & port)
{
DjVuPortcaster *pcaster = get_portcaster();
GCriticalSectionLock lock(& pcaster->map_lock );
GPosition p = pcaster->cont_map.contains(this);
if (!p) G_THROW( ERR_MSG("DjVuPort.not_alloc") );
pcaster->cont_map[p] = (void*)this;
pcaster->copy_routes(this, &port);
}
DjVuPort &
DjVuPort::operator=(const DjVuPort & port)
{
if (this != &port)
get_portcaster()->copy_routes(this, &port);
return *this;
}
DjVuPort::~DjVuPort(void)
{
get_portcaster()->del_port(this);
}
//****************************************************************************
//**************************** DjVuPortcaster ********************************
//****************************************************************************
DjVuPortcaster::DjVuPortcaster(void)
{
}
DjVuPortcaster::~DjVuPortcaster(void)
{
GCriticalSectionLock lock(&map_lock);
for(GPosition pos=route_map;pos;++pos)
delete (GList<void *> *) route_map[pos];
}
GP<DjVuPort>
DjVuPortcaster::is_port_alive(DjVuPort *port)
{
GP<DjVuPort> gp_port;
GCriticalSectionLock lock(&map_lock);
GPosition pos=cont_map.contains(port);
if (pos && cont_map[pos] && ((DjVuPort *) port)->get_count()>0)
gp_port=port;
return gp_port;
}
void
DjVuPortcaster::add_alias(const DjVuPort * port, const GUTF8String &alias)
{
GCriticalSectionLock lock(&map_lock);
a2p_map[alias]=port;
}
void
DjVuPortcaster::clear_all_aliases(void)
{
DjVuPortcaster *p=get_portcaster();
GCriticalSectionLock lock(&(p->map_lock));
GPosition pos;
while((pos=p->a2p_map))
{
p->a2p_map.del(pos);
}
}
void
DjVuPortcaster::clear_aliases(const DjVuPort * port)
{
GCriticalSectionLock lock(&map_lock);
for(GPosition pos=a2p_map;pos;)
if (a2p_map[pos]==port)
{
GPosition this_pos=pos;
++pos;
a2p_map.del(this_pos);
} else ++pos;
}
GP<DjVuPort>
DjVuPortcaster::alias_to_port(const GUTF8String &alias)
{
GCriticalSectionLock lock(&map_lock);
GPosition pos;
if (a2p_map.contains(alias, pos))
{
DjVuPort * port=(DjVuPort *) a2p_map[pos];
GP<DjVuPort> gp_port=is_port_alive(port);
if (gp_port) return gp_port;
else a2p_map.del(pos);
}
return 0;
}
GPList<DjVuPort>
DjVuPortcaster::prefix_to_ports(const GUTF8String &prefix)
{
GPList<DjVuPort> list;
{
int length=prefix.length();
if (length)
{
GCriticalSectionLock lock(&map_lock);
for(GPosition pos=a2p_map;pos;++pos)
if (!prefix.cmp(a2p_map.key(pos), length))
{
DjVuPort * port=(DjVuPort *) a2p_map[pos];
GP<DjVuPort> gp_port=is_port_alive(port);
if (gp_port) list.append(gp_port);
}
}
}
return list;
}
void
DjVuPortcaster::del_port(const DjVuPort * port)
{
GCriticalSectionLock lock(&map_lock);
GPosition pos;
// Update the "aliases map"
clear_aliases(port);
// Update "contents map"
if (cont_map.contains(port, pos)) cont_map.del(pos);
// Update "route map"
if (route_map.contains(port, pos))
{
delete (GList<void *> *) route_map[pos];
route_map.del(pos);
}
for(pos=route_map;pos;)
{
GList<void *> & list=*(GList<void *> *) route_map[pos];
GPosition list_pos;
if (list.search((void *) port, list_pos)) list.del(list_pos);
if (!list.size())
{
delete &list;
GPosition tmp_pos=pos;
++pos;
route_map.del(tmp_pos);
} else ++pos;
}
}
void
DjVuPortcaster::add_route(const DjVuPort * src, DjVuPort * dst)
// Adds route src->dst
{
GCriticalSectionLock lock(&map_lock);
if (cont_map.contains(src) && src->get_count()>0 &&
cont_map.contains(dst) && dst->get_count()>0)
{
if (!route_map.contains(src)) route_map[src]=new GList<void *>();
GList<void *> & list=*(GList<void *> *) route_map[src];
if (!list.contains(dst)) list.append(dst);
}
}
void
DjVuPortcaster::del_route(const DjVuPort * src, DjVuPort * dst)
// Deletes route src->dst
{
GCriticalSectionLock lock(&map_lock);
if (route_map.contains(src))
{
GList<void *> & list=*(GList<void *> *) route_map[src];
GPosition pos;
if (list.search(dst, pos)) list.del(pos);
if (!list.size())
{
delete &list;
route_map.del(src);
}
}
}
void
DjVuPortcaster::copy_routes(DjVuPort * dst, const DjVuPort * src)
// For every route src->x or x->src, it creates a new one:
// dst->x or x->dst respectively. It's useful when you create a copy
// of a port and you want the copy to stay connected.
{
GCriticalSectionLock lock(&map_lock);
if (!cont_map.contains(src) || src->get_count()<=0 ||
!cont_map.contains(dst) || dst->get_count()<=0) return;
for(GPosition pos=route_map;pos;++pos)
{
GList<void *> & list=*(GList<void *> *) route_map[pos];
if (route_map.key(pos) == src)
for(GPosition pos=list;pos;++pos)
add_route(dst, (DjVuPort *) list[pos]);
for(GPosition pos=list;pos;++pos)
if ((DjVuPort*)(list[pos]) == src)
add_route((DjVuPort *) route_map.key(pos), dst);
}
}
void
DjVuPortcaster::add_to_closure(GMap<const void *, void *> & set,
const DjVuPort * dst, int distance)
{
// Assuming that the map's already locked
// GCriticalSectionLock lock(&map_lock);
set[dst]= (void*) (unsigned long) distance;
if (route_map.contains(dst))
{
GList<void *> & list=*(GList<void *> *) route_map[dst];
for(GPosition pos=list;pos;++pos)
{
DjVuPort * new_dst=(DjVuPort *) list[pos];
if (!set.contains(new_dst))
add_to_closure(set, new_dst, distance+1);
}
}
}
void
DjVuPortcaster::compute_closure(const DjVuPort * src, GPList<DjVuPort> &list, bool sorted)
{
GCriticalSectionLock lock(&map_lock);
GMap<const void*, void*> set;
if (route_map.contains(src))
{
GList<void *> & list=*(GList<void *> *) route_map[src];
for(GPosition pos=list;pos;++pos)
{
DjVuPort * dst=(DjVuPort *) list[pos];
if (dst==src) add_to_closure(set, src, 0);
else add_to_closure(set, dst, 1);
}
}
// Compute list
GPosition pos;
if (sorted)
{
// Sort in depth order
int max_dist=0;
for(pos=set;pos;++pos)
if (max_dist < (int)(long)set[pos])
max_dist = (int)(long)set[pos];
GArray<GList<const void*> > lists(0,max_dist);
for(pos=set;pos;++pos)
lists[(int)(long)set[pos]].append(set.key(pos));
for(int dist=0;dist<=max_dist;dist++)
for(pos=lists[dist];pos;++pos)
{
GP<DjVuPort> p = is_port_alive((DjVuPort*) lists[dist][pos]);
if (p) list.append(p);
}
}
else
{
// Gather ports without order
for(pos=set;pos;++pos)
{
GP<DjVuPort> p = is_port_alive((DjVuPort*) set.key(pos));
if (p) list.append(p);
}
}
}
GURL
DjVuPortcaster::id_to_url(const DjVuPort * source, const GUTF8String &id)
{
GPList<DjVuPort> list;
compute_closure(source, list, true);
GURL url;
for(GPosition pos=list;pos;++pos)
{
url=list[pos]->id_to_url(source, id);
if (!url.is_empty()) break;
}
return url;
}
GP<DjVuFile>
DjVuPortcaster::id_to_file(const DjVuPort * source, const GUTF8String &id)
{
GPList<DjVuPort> list;
compute_closure(source, list, true);
GP<DjVuFile> file;
for(GPosition pos=list;pos;++pos)
if ((file=list[pos]->id_to_file(source, id))) break;
return file;
}
GP<DataPool>
DjVuPortcaster::request_data(const DjVuPort * source, const GURL & url)
{
GPList<DjVuPort> list;
compute_closure(source, list, true);
GP<DataPool> data;
for(GPosition pos=list;pos;++pos)
if ((data = list[pos]->request_data(source, url)))
break;
return data;
}
bool
DjVuPortcaster::notify_error(const DjVuPort * source, const GUTF8String &msg)
{
GPList<DjVuPort> list;
compute_closure(source, list, true);
for(GPosition pos=list;pos;++pos)
if (list[pos]->notify_error(source, msg))
return 1;
return 0;
}
bool
DjVuPortcaster::notify_status(const DjVuPort * source, const GUTF8String &msg)
{
GPList<DjVuPort> list;
compute_closure(source, list, true);
for(GPosition pos=list;pos;++pos)
if (list[pos]->notify_status(source, msg))
return 1;
return 0;
}
void
DjVuPortcaster::notify_redisplay(const DjVuImage * source)
{
GPList<DjVuPort> list;
compute_closure(source, list);
for(GPosition pos=list; pos; ++pos)
list[pos]->notify_redisplay(source);
}
void
DjVuPortcaster::notify_relayout(const DjVuImage * source)
{
GPList<DjVuPort> list;
compute_closure(source, list);
for(GPosition pos=list; pos; ++pos)
list[pos]->notify_relayout(source);
}
void
DjVuPortcaster::notify_chunk_done(const DjVuPort * source, const GUTF8String &name)
{
GPList<DjVuPort> list;
compute_closure(source, list);
for(GPosition pos=list; pos; ++pos)
list[pos]->notify_chunk_done(source, name);
}
void
DjVuPortcaster::notify_file_flags_changed(const DjVuFile * source,
long set_mask, long clr_mask)
{
GPList<DjVuPort> list;
compute_closure(source, list);
for(GPosition pos=list; pos; ++pos)
list[pos]->notify_file_flags_changed(source, set_mask, clr_mask);
}
void
DjVuPortcaster::notify_doc_flags_changed(const DjVuDocument * source,
long set_mask, long clr_mask)
{
GPList<DjVuPort> list;
compute_closure(source, list);
for(GPosition pos=list; pos; ++pos)
list[pos]->notify_doc_flags_changed(source, set_mask, clr_mask);
}
void
DjVuPortcaster::notify_decode_progress(const DjVuPort * source, float done)
{
GPList<DjVuPort> list;
compute_closure(source, list);
for(GPosition pos=list; pos; ++pos)
list[pos]->notify_decode_progress(source, done);
}
//****************************************************************************
//******************************* DjVuPort ***********************************
//****************************************************************************
GURL
DjVuPort::id_to_url(const DjVuPort *, const GUTF8String &) { return GURL(); }
GP<DjVuFile>
DjVuPort::id_to_file(const DjVuPort *, const GUTF8String &) { return 0; }
GP<DataPool>
DjVuPort::request_data(const DjVuPort *, const GURL &) { return 0; }
bool
DjVuPort::notify_error(const DjVuPort *, const GUTF8String &) { return 0; }
bool
DjVuPort::notify_status(const DjVuPort *, const GUTF8String &) { return 0; }
void
DjVuPort::notify_redisplay(const DjVuImage *) {}
void
DjVuPort::notify_relayout(const DjVuImage *) {}
void
DjVuPort::notify_chunk_done(const DjVuPort *, const GUTF8String &) {}
void
DjVuPort::notify_file_flags_changed(const DjVuFile *, long, long) {}
void
DjVuPort::notify_doc_flags_changed(const DjVuDocument *, long, long) {}
void
DjVuPort::notify_decode_progress(const DjVuPort *, float) {}
//****************************************************************************
//*************************** DjVuSimplePort *********************************
//****************************************************************************
GP<DataPool>
DjVuSimplePort::request_data(const DjVuPort * source, const GURL & url)
{
G_TRY {
if (url.is_local_file_url())
{
// GUTF8String fname=GOS::url_to_filename(url);
// if (GOS::basename(fname)=="-") fname="-";
return DataPool::create(url);
}
} G_CATCH_ALL {} G_ENDCATCH;
return 0;
}
bool
DjVuSimplePort::notify_error(const DjVuPort * source, const GUTF8String &msg)
{
DjVuMessageLite::perror(msg);
return 1;
}
bool
DjVuSimplePort::notify_status(const DjVuPort * source, const GUTF8String &msg)
{
DjVuMessageLite::perror(msg);
return 1;
}
//****************************************************************************
//*************************** DjVuMemoryPort *********************************
//****************************************************************************
GP<DataPool>
DjVuMemoryPort::request_data(const DjVuPort * source, const GURL & url)
{
GCriticalSectionLock lk(&lock);
GP<DataPool> pool;
GPosition pos;
if (map.contains(url, pos))
pool=map[pos];
return pool;
}
void
DjVuMemoryPort::add_data(const GURL & url, const GP<DataPool> & pool)
{
GCriticalSectionLock lk(&lock);
map[url]=pool;
}
#ifdef HAVE_NAMESPACES
}
# ifndef NOT_USING_DJVU_NAMESPACE
using namespace DJVU;
# endif
#endif
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