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DjVuFile.cpp
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DjVuFile.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: DjVuFile.cpp,v 1.16 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 "DjVuFile.h"
#include "IFFByteStream.h"
#include "GOS.h"
#include "MMRDecoder.h"
#ifdef NEED_JPEG_DECODER
#include "JPEGDecoder.h"
#endif
#include "DjVuAnno.h"
#include "DjVuText.h"
#include "DataPool.h"
#include "JB2Image.h"
#include "IW44Image.h"
#include "DjVuNavDir.h"
#ifndef NEED_DECODER_ONLY
#include "BSByteStream.h"
#endif // NEED_DECODER_ONLY
#include "debug.h"
#ifdef HAVE_NAMESPACES
namespace DJVU {
# ifdef NOT_DEFINED // Just to fool emacs c++ mode
}
#endif
#endif
#define STRINGIFY(x) STRINGIFY_(x)
#define STRINGIFY_(x) #x
#define REPORT_EOF(x) \
{G_TRY{G_THROW( ByteStream::EndOfFile );}G_CATCH(ex){report_error(ex,(x));}G_ENDCATCH;}
static GP<GPixmap> (*djvu_decode_codec)(ByteStream &bs)=0;
class ProgressByteStream : public ByteStream
{
public:
ProgressByteStream(const GP<ByteStream> & xstr) : str(xstr),
last_call_pos(0) {}
virtual ~ProgressByteStream() {}
virtual size_t read(void *buffer, size_t size)
{
int rc=0;
// G_TRY {} CATCH; block here is merely to avoid egcs internal error
G_TRY {
int cur_pos=str->tell();
if (progress_cb && (last_call_pos/256!=cur_pos/256))
{
progress_cb(cur_pos, progress_cl_data);
last_call_pos=cur_pos;
}
rc=str->read(buffer, size);
} G_CATCH_ALL {
G_RETHROW;
} G_ENDCATCH;
return rc;
}
virtual size_t write(const void *buffer, size_t size)
{
return str->write(buffer, size);
}
virtual int seek(long offset, int whence = SEEK_SET, bool nothrow=false)
{
return str->seek(offset, whence);
}
virtual long tell(void ) const { return str->tell(); }
void set_progress_cb(void (* xprogress_cb)(int, void *),
void * xprogress_cl_data)
{
progress_cb=xprogress_cb;
progress_cl_data=xprogress_cl_data;
}
private:
GP<ByteStream> str;
void * progress_cl_data;
void (* progress_cb)(int pos, void *);
int last_call_pos;
// Cancel C++ default stuff
ProgressByteStream & operator=(const ProgressByteStream &);
};
DjVuFile::DjVuFile()
: file_size(0), recover_errors(ABORT), verbose_eof(false), chunks_number(-1),
initialized(false)
{
}
void
DjVuFile::check() const
{
if (!initialized)
G_THROW( ERR_MSG("DjVuFile.not_init") );
}
GP<DjVuFile>
DjVuFile::create(
const GP<ByteStream> & str, const ErrorRecoveryAction recover_errors,
const bool verbose_eof )
{
DjVuFile *file=new DjVuFile();
GP<DjVuFile> retval=file;
file->set_recover_errors(recover_errors);
file->set_verbose_eof(verbose_eof);
file->init(str);
return retval;
}
void
DjVuFile::init(const GP<ByteStream> & str)
{
DEBUG_MSG("DjVuFile::DjVuFile(): ByteStream constructor\n");
DEBUG_MAKE_INDENT(3);
if (initialized)
G_THROW( ERR_MSG("DjVuFile.2nd_init") );
if (!get_count())
G_THROW( ERR_MSG("DjVuFile.not_secured") );
file_size=0;
decode_thread=0;
// Read the data from the stream
data_pool=DataPool::create(str);
// Construct some dummy URL
GUTF8String buffer;
buffer.format("djvufile:/%p.djvu", this);
DEBUG_MSG("DjVuFile::DjVuFile(): url is "<<(const char *)buffer<<"\n");
url=GURL::UTF8(buffer);
// Set it here because trigger will call other DjVuFile's functions
initialized=true;
// Add (basically - call) the trigger
data_pool->add_trigger(-1, static_trigger_cb, this);
}
GP<DjVuFile>
DjVuFile::create(
const GURL & xurl, GP<DjVuPort> port,
const ErrorRecoveryAction recover_errors, const bool verbose_eof )
{
DjVuFile *file=new DjVuFile();
GP<DjVuFile> retval=file;
file->set_recover_errors(recover_errors);
file->set_verbose_eof(verbose_eof);
file->init(xurl,port);
return retval;
}
void
DjVuFile::init(const GURL & xurl, GP<DjVuPort> port)
{
DEBUG_MSG("DjVuFile::init(): url='" << xurl << "'\n");
DEBUG_MAKE_INDENT(3);
if (initialized)
G_THROW( ERR_MSG("DjVuFile.2nd_init") );
if (!get_count())
G_THROW( ERR_MSG("DjVuFile.not_secured") );
if (xurl.is_empty())
G_THROW( ERR_MSG("DjVuFile.empty_URL") );
url = xurl;
DEBUG_MSG("DjVuFile::DjVuFile(): url is "<<(const char *)url<<"\n");
file_size=0;
decode_thread=0;
DjVuPortcaster * pcaster=get_portcaster();
// We need it 'cause we're waiting for our own termination in stop_decode()
pcaster->add_route(this, this);
if (!port)
port = simple_port = new DjVuSimplePort();
pcaster->add_route(this, port);
// Set it here because trigger will call other DjVuFile's functions
initialized=true;
if (!(data_pool=DataPool::create(pcaster->request_data(this, url))))
G_THROW( ERR_MSG("DjVuFile.no_data") "\t"+url.get_string());
data_pool->add_trigger(-1, static_trigger_cb, this);
}
DjVuFile::~DjVuFile(void)
{
DEBUG_MSG("DjVuFile::~DjVuFile(): destroying...\n");
DEBUG_MAKE_INDENT(3);
// No more messages. They may result in adding this file to a cache
// which will be very-very bad as we're being destroyed
get_portcaster()->del_port(this);
// Unregister the trigger (we don't want it to be called and attempt
// to access the destroyed object)
if (data_pool)
data_pool->del_trigger(static_trigger_cb, this);
// We don't have to wait for decoding to finish here. It's already
// finished (we know it because there is a "life saver" in the
// thread function) -- but we need to delete it
delete decode_thread; decode_thread=0;
}
void
DjVuFile::reset(void)
{
flags.enter();
info = 0;
anno = 0;
text = 0;
meta = 0;
bg44 = 0;
fgbc = 0;
fgjb = 0;
fgjd = 0;
fgpm = 0;
dir = 0;
description = "";
mimetype = "";
flags=(flags&(ALL_DATA_PRESENT|DECODE_STOPPED|DECODE_FAILED));
flags.leave();
}
unsigned int
DjVuFile::get_memory_usage(void) const
{
unsigned int size=sizeof(*this);
if (info) size+=info->get_memory_usage();
if (bg44) size+=bg44->get_memory_usage();
if (fgjb) size+=fgjb->get_memory_usage();
if (fgpm) size+=fgpm->get_memory_usage();
if (fgbc) size+=fgbc->size()*sizeof(int);
if (anno) size+=anno->size();
if (meta) size+=meta->size();
if (dir) size+=dir->get_memory_usage();
return size;
}
GPList<DjVuFile>
DjVuFile::get_included_files(bool only_created)
{
check();
if (!only_created && !are_incl_files_created())
process_incl_chunks();
GCriticalSectionLock lock(&inc_files_lock);
GPList<DjVuFile> list=inc_files_list; // Get a copy when locked
return list;
}
void
DjVuFile::wait_for_chunk(void)
// Will return after a chunk has been decoded
{
check();
DEBUG_MSG("DjVuFile::wait_for_chunk() called\n");
DEBUG_MAKE_INDENT(3);
chunk_mon.enter();
chunk_mon.wait();
chunk_mon.leave();
}
bool
DjVuFile::wait_for_finish(bool self)
// if self==TRUE, will block until decoding of this file is over
// if self==FALSE, will block until decoding of a child (direct
// or indirect) is over.
// Will return FALSE if there is nothing to wait for. TRUE otherwise
{
DEBUG_MSG("DjVuFile::wait_for_finish(): self=" << self <<"\n");
DEBUG_MAKE_INDENT(3);
check();
if (self)
{
// It's best to check for self termination using flags. The reason
// is that finish_mon is updated in a DjVuPort function, which
// will not be called if the object is being destroyed
GMonitorLock lock(&flags);
if (is_decoding())
{
while(is_decoding()) flags.wait();
DEBUG_MSG("got it\n");
return 1;
}
} else
{
// By locking the monitor, we guarantee that situation doesn't change
// between the moments when we check for pending finish events
// and when we actually run wait(). If we don't lock, the last child
// may terminate in between, and we'll wait forever.
//
// Locking is required by GMonitor interface too, btw.
GMonitorLock lock(&finish_mon);
GP<DjVuFile> file;
{
GCriticalSectionLock lock(&inc_files_lock);
for(GPosition pos=inc_files_list;pos;++pos)
{
GP<DjVuFile> & f=inc_files_list[pos];
if (f->is_decoding())
{
file=f; break;
}
}
}
if (file)
{
finish_mon.wait();
DEBUG_MSG("got it\n");
return 1;
}
}
DEBUG_MSG("nothing to wait for\n");
return 0;
}
void
DjVuFile::notify_chunk_done(const DjVuPort *, const GUTF8String &)
{
check();
chunk_mon.enter();
chunk_mon.broadcast();
chunk_mon.leave();
}
void
DjVuFile::notify_file_flags_changed(const DjVuFile * src,
long set_mask, long clr_mask)
{
check();
if (set_mask & (DECODE_OK | DECODE_FAILED | DECODE_STOPPED))
{
// Signal threads waiting for file termination
finish_mon.enter();
finish_mon.broadcast();
finish_mon.leave();
// In case a thread is still waiting for a chunk
chunk_mon.enter();
chunk_mon.broadcast();
chunk_mon.leave();
}
if ((set_mask & ALL_DATA_PRESENT) && src!=this &&
are_incl_files_created() && is_data_present())
{
if (src!=this && are_incl_files_created() && is_data_present())
{
// Check if all children have data
bool all=true;
{
GCriticalSectionLock lock(&inc_files_lock);
for(GPosition pos=inc_files_list;pos;++pos)
if (!inc_files_list[pos]->is_all_data_present())
{
all=false;
break;
}
}
if (all)
{
DEBUG_MSG("Just got ALL data for '" << url << "'\n");
flags|=ALL_DATA_PRESENT;
get_portcaster()->notify_file_flags_changed(this, ALL_DATA_PRESENT, 0);
}
}
}
}
void
DjVuFile::static_decode_func(void * cl_data)
{
DjVuFile * th=(DjVuFile *) cl_data;
/* Please do not undo this life saver. If you do then try to resolve the
following conflict first:
1. Decoding starts and there is only one external reference
to the DjVuFile.
2. Decoding proceeds and calls DjVuPortcaster::notify_error(),
which creates inside a temporary GP<DjVuFile>.
3. While notify_error() is running, the only external reference
is lost, but the DjVuFile is still alive (remember the
temporary GP<>?)
4. The notify_error() returns, the temporary GP<> gets destroyed
and the DjVuFile is attempting to destroy right in the middle
of the decoding thread. This is either a dead block (waiting
for the termination of the decoding from the ~DjVuFile() called
from the decoding thread) or coredump. */
GP<DjVuFile> life_saver=th;
th->decode_life_saver=0;
G_TRY {
th->decode_func();
} G_CATCH_ALL {
} G_ENDCATCH;
}
void
DjVuFile::decode_func(void)
{
check();
DEBUG_MSG("DjVuFile::decode_func() called, url='" << url << "'\n");
DEBUG_MAKE_INDENT(3);
DjVuPortcaster * pcaster=get_portcaster();
G_TRY {
const GP<ByteStream> decode_stream(decode_data_pool->get_stream());
ProgressByteStream *pstr=new ProgressByteStream(decode_stream);
const GP<ByteStream> gpstr(pstr);
pstr->set_progress_cb(progress_cb, this);
decode(gpstr);
// Wait for all child files to finish
while(wait_for_finish(0))
continue;
DEBUG_MSG("waiting for children termination\n");
// Check for termination status
GCriticalSectionLock lock(&inc_files_lock);
for(GPosition pos=inc_files_list;pos;++pos)
{
GP<DjVuFile> & f=inc_files_list[pos];
if (f->is_decode_failed())
G_THROW( ERR_MSG("DjVuFile.decode_fail") );
if (f->is_decode_stopped())
G_THROW( DataPool::Stop );
if (!f->is_decode_ok())
{
DEBUG_MSG("this_url='" << url << "'\n");
DEBUG_MSG("incl_url='" << f->get_url() << "'\n");
DEBUG_MSG("decoding=" << f->is_decoding() << "\n");
DEBUG_MSG("status='" << f->get_flags() << "\n");
G_THROW( ERR_MSG("DjVuFile.not_finished") );
}
}
} G_CATCH(exc) {
G_TRY {
if (!exc.cmp_cause(DataPool::Stop))
{
flags.enter();
flags = (flags & ~DECODING) | DECODE_STOPPED;
flags.leave();
pcaster->notify_status(this, GUTF8String(ERR_MSG("DjVuFile.stopped"))
+ GUTF8String("\t") + GUTF8String(url));
pcaster->notify_file_flags_changed(this, DECODE_STOPPED, DECODING);
} else
{
flags.enter();
flags = (flags & ~DECODING) | DECODE_FAILED;
flags.leave();
pcaster->notify_status(this, GUTF8String(ERR_MSG("DjVuFile.failed"))
+ GUTF8String("\t") + GUTF8String(url));
pcaster->notify_error(this, exc.get_cause());
pcaster->notify_file_flags_changed(this, DECODE_FAILED, DECODING);
}
} G_CATCH_ALL
{
DEBUG_MSG("******* Oops. Almost missed an exception\n");
} G_ENDCATCH;
} G_ENDCATCH;
//< Changed for WinDjView project
// decode_data_pool->clear_stream();
//>
G_TRY {
if (flags.test_and_modify(DECODING, 0, DECODE_OK | INCL_FILES_CREATED, DECODING))
pcaster->notify_file_flags_changed(this, DECODE_OK | INCL_FILES_CREATED,
DECODING);
} G_CATCH_ALL {} G_ENDCATCH;
DEBUG_MSG("decoding thread for url='" << url << "' ended\n");
}
GP<DjVuFile>
DjVuFile::process_incl_chunk(ByteStream & str, int file_num)
{
check();
DEBUG_MSG("DjVuFile::process_incl_chunk(): processing INCL chunk...\n");
DEBUG_MAKE_INDENT(3);
DjVuPortcaster * pcaster=get_portcaster();
GUTF8String incl_str;
char buffer[1024];
int length;
while((length=str.read(buffer, 1024)))
incl_str+=GUTF8String(buffer, length);
// Eat '\n' in the beginning and at the end
while(incl_str.length() && incl_str[0]=='\n')
{
incl_str=incl_str.substr(1,(unsigned int)(-1));
}
while(incl_str.length()>0 && incl_str[(int)incl_str.length()-1]=='\n')
{
incl_str.setat(incl_str.length()-1, 0);
}
if (incl_str.length()>0)
{
if (strchr(incl_str, '/'))
G_THROW( ERR_MSG("DjVuFile.malformed") );
DEBUG_MSG("incl_str='" << incl_str << "'\n");
GURL incl_url=pcaster->id_to_url(this, incl_str);
if (incl_url.is_empty()) // Fallback. Should never be used.
incl_url=GURL::UTF8(incl_str,url.base());
// Now see if there is already a file with this *name* created
{
GCriticalSectionLock lock(&inc_files_lock);
GPosition pos;
for(pos=inc_files_list;pos;++pos)
{
if (inc_files_list[pos]->url.fname()==incl_url.fname())
break;
}
if (pos)
return inc_files_list[pos];
}
// No. We have to request a new file
GP<DjVuFile> file;
G_TRY
{
file=pcaster->id_to_file(this, incl_str);
}
G_CATCH(ex)
{
unlink_file(incl_str);
// In order to keep compatibility with the previous
// release of the DjVu plugin, we will not interrupt
// decoding here. We will just report the error.
// NOTE, that it's now the responsibility of the
// decoder to resolve all chunk dependencies, and
// abort decoding if necessary.
// G_EXTHROW(ex); /* commented out */
get_portcaster()->notify_error(this,ex.get_cause());
return 0;
}
G_ENDCATCH;
if (!file)
{
G_THROW( ERR_MSG("DjVuFile.no_create") "\t"+incl_str);
}
if (recover_errors!=ABORT)
file->set_recover_errors(recover_errors);
if (verbose_eof)
file->set_verbose_eof(verbose_eof);
pcaster->add_route(file, this);
// We may have been stopped. Make sure the child will be stopped too.
if (flags & STOPPED)
file->stop(false);
if (flags & BLOCKED_STOPPED)
file->stop(true);
// Lock the list again and check if the file has already been
// added by someone else
{
GCriticalSectionLock lock(&inc_files_lock);
GPosition pos;
for(pos=inc_files_list;pos;++pos)
{
if (inc_files_list[pos]->url.fname()==incl_url.fname())
break;
}
if (pos)
{
file=inc_files_list[pos];
} else if (file_num<0 || !(pos=inc_files_list.nth(file_num)))
{
inc_files_list.append(file);
} else
{
inc_files_list.insert_before(pos, file);
}
}
return file;
}
return 0;
}
void
DjVuFile::report_error(const GException &ex,bool throw_errors)
{
data_pool->clear_stream();
if((!verbose_eof)|| (ex.cmp_cause(ByteStream::EndOfFile)))
{
if(throw_errors)
{
G_EXTHROW(ex);
}else
{
get_portcaster()->notify_error(this,ex.get_cause());
}
}else
{
GURL url=get_url();
GUTF8String url_str=url.get_string();
// if (url.is_local_file_url())
// url_str=url.filename();
GUTF8String msg = GUTF8String( ERR_MSG("DjVuFile.EOF") "\t") + url;
if(throw_errors)
{
G_EXTHROW(ex, msg);
}else
{
get_portcaster()->notify_error(this,msg);
}
}
}
void
DjVuFile::process_incl_chunks(void)
// This function may block for data
// NOTE: It may be called again when INCL_FILES_CREATED is set.
// It happens in insert_file() when it has modified the data
// and wants to create the actual file
{
DEBUG_MSG("DjVuFile::process_incl_chunks(void)\n");
DEBUG_MAKE_INDENT(3);
check();
int incl_cnt=0;
const GP<ByteStream> str(data_pool->get_stream());
GUTF8String chkid;
const GP<IFFByteStream> giff(IFFByteStream::create(str));
IFFByteStream &iff=*giff;
if (iff.get_chunk(chkid))
{
int chunks=0;
int last_chunk=0;
G_TRY
{
int chunks_left=(recover_errors>SKIP_PAGES)?chunks_number:(-1);
int chksize;
for(;(chunks_left--)&&(chksize=iff.get_chunk(chkid));last_chunk=chunks)
{
chunks++;
if (chkid=="INCL")
{
G_TRY
{
process_incl_chunk(*iff.get_bytestream(), incl_cnt++);
}
G_CATCH(ex);
{
report_error(ex,(recover_errors <= SKIP_PAGES));
}
G_ENDCATCH;
}else if(chkid=="FAKE")
{
set_needs_compression(true);
set_can_compress(true);
}else if(chkid=="BGjp")
{
set_can_compress(true);
}else if(chkid=="Smmr")
{
set_can_compress(true);
}
iff.seek_close_chunk();
}
if (chunks_number < 0) chunks_number=last_chunk;
}
G_CATCH(ex)
{
if (chunks_number < 0)
chunks_number=(recover_errors>SKIP_CHUNKS)?chunks:last_chunk;
report_error(ex,(recover_errors <= SKIP_PAGES));
}
G_ENDCATCH;
}
flags|=INCL_FILES_CREATED;
data_pool->clear_stream();
}
GP<JB2Dict>
DjVuFile::static_get_fgjd(void *arg)
{
DjVuFile *file = (DjVuFile*)arg;
return file->get_fgjd(1);
}
GP<JB2Dict>
DjVuFile::get_fgjd(int block)
{
check();
// Simplest case
if (fgjd)
return fgjd;
// Check wether included files
chunk_mon.enter();
G_TRY {
for(;;)
{
int active = 0;
GPList<DjVuFile> incs = get_included_files();
for (GPosition pos=incs.firstpos(); pos; ++pos)
{
GP<DjVuFile> file = incs[pos];
if (file->is_decoding())
active = 1;
GP<JB2Dict> fgjd = file->get_fgjd();
if (fgjd)
{
chunk_mon.leave();
return fgjd;
}
}
// Exit if non-blocking mode
if (! block)
break;
// Exit if there is no decoding activity
if (! active)
break;
// Wait until a new chunk gets decoded
wait_for_chunk();
}
} G_CATCH_ALL {
chunk_mon.leave();
G_RETHROW;
} G_ENDCATCH;
chunk_mon.leave();
if (is_decode_stopped()) G_THROW( DataPool::Stop );
return 0;
}
int
DjVuFile::get_dpi(int w, int h)
{
int dpi=0, red=1;
if (info)
{
for(red=1; red<=12; red++)
if ((info->width+red-1)/red==w)
if ((info->height+red-1)/red==h)
break;
if (red>12)
G_THROW( ERR_MSG("DjVuFile.corrupt_BG44") );
dpi=info->dpi;
}
return (dpi ? dpi : 300)/red;
}
static inline bool
is_info(const GUTF8String &chkid)
{
return (chkid=="INFO");
}
static inline bool
is_annotation(const GUTF8String &chkid)
{
return (chkid=="ANTa" ||
chkid=="ANTz" ||
chkid=="FORM:ANNO" );
}
static inline bool
is_text(const GUTF8String &chkid)
{
return (chkid=="TXTa" || chkid=="TXTz");
}
static inline bool
is_meta(const GUTF8String &chkid)
{
return (chkid=="METa" || chkid=="METz");
}
GUTF8String
DjVuFile::decode_chunk( const GUTF8String &id, const GP<ByteStream> &gbs,
bool djvi, bool djvu, bool iw44)
{
DEBUG_MSG("DjVuFile::decode_chunk()\n");
ByteStream &bs=*gbs;
check();
// If this object is referenced by only one GP<> pointer, this
// pointer should be the "life_saver" created by the decoding thread.
// If it is the only GP<> pointer, then nobody is interested in the
// results of the decoding and we can abort now with #DataPool::Stop#
if (get_count()==1)
G_THROW( DataPool::Stop );
GUTF8String desc = ERR_MSG("DjVuFile.unrecog_chunk");
GUTF8String chkid = id;
DEBUG_MSG("DjVuFile::decode_chunk() : decoding " << id << "\n");
// INFO (information chunk for djvu page)
if (is_info(chkid) && (djvu || djvi))
{
if (info)
G_THROW( ERR_MSG("DjVuFile.corrupt_dupl") );
if (djvi)
G_THROW( ERR_MSG("DjVuFile.corrupt_INFO") );
// DjVuInfo::decode no longer throws version exceptions
GP<DjVuInfo> xinfo=DjVuInfo::create();
xinfo->decode(bs);
info = xinfo;
desc.format( ERR_MSG("DjVuFile.page_info") );
// Consistency checks (previously in DjVuInfo::decode)
if (info->width<0 || info->height<0)
G_THROW( ERR_MSG("DjVuFile.corrupt_zero") );
if (info->version >= DJVUVERSION_TOO_NEW)
G_THROW( ERR_MSG("DjVuFile.new_version") "\t"
STRINGIFY(DJVUVERSION_TOO_NEW) );
}
// INCL (inclusion chunk)
else if (chkid == "INCL" && (djvi || djvu || iw44))
{
GP<DjVuFile> file=process_incl_chunk(bs);
if (file)
{
int decode_was_already_started = 1;
{
GMonitorLock lock(&file->flags);
// Start decoding
if(file->resume_decode())
{
decode_was_already_started = 0;
}
}
// Send file notifications if previously started
if (decode_was_already_started)
{
// May send duplicate notifications...
if (file->is_decode_ok())
get_portcaster()->notify_file_flags_changed(file, DECODE_OK, 0);
else if (file->is_decode_failed())
get_portcaster()->notify_file_flags_changed(file, DECODE_FAILED, 0);
}
desc.format( ERR_MSG("DjVuFile.indir_chunk1") "\t" + file->get_url().fname() );
} else
desc.format( ERR_MSG("DjVuFile.indir_chunk2") );
}
// Djbz (JB2 Dictionary)
else if (chkid == "Djbz" && (djvu || djvi))
{
if (this->fgjd)
G_THROW( ERR_MSG("DjVuFile.dupl_Dxxx") );
if (this->fgjd)
G_THROW( ERR_MSG("DjVuFile.Dxxx_after_Sxxx") );
GP<JB2Dict> fgjd = JB2Dict::create();
fgjd->decode(gbs);
this->fgjd = fgjd;
desc.format( ERR_MSG("DjVuFile.shape_dict") "\t%d", fgjd->get_shape_count() );
}
// Sjbz (JB2 encoded mask)
else if (chkid=="Sjbz" && (djvu || djvi))
{
if (this->fgjb)
G_THROW( ERR_MSG("DjVuFile.dupl_Sxxx") );
GP<JB2Image> fgjb=JB2Image::create();
// ---- begin hack
if (info && info->version <=18)
fgjb->reproduce_old_bug = true;
// ---- end hack
fgjb->decode(gbs, static_get_fgjd, (void*)this);
this->fgjb = fgjb;
desc.format( ERR_MSG("DjVuFile.fg_mask") "\t%d\t%d\t%d",
fgjb->get_width(), fgjb->get_height(),
get_dpi(fgjb->get_width(), fgjb->get_height()));
}
// Smmr (MMR-G4 encoded mask)
else if (chkid=="Smmr" && (djvu || djvi))
{
if (this->fgjb)
G_THROW( ERR_MSG("DjVuFile.dupl_Sxxx") );
set_can_compress(true);
this->fgjb = MMRDecoder::decode(gbs);
desc.format( ERR_MSG("DjVuFile.G4_mask") "\t%d\t%d\t%d",
fgjb->get_width(), fgjb->get_height(),
get_dpi(fgjb->get_width(), fgjb->get_height()));
}
// BG44 (background wavelets)
else if (chkid == "BG44" && (djvu || djvi))
{
if (!bg44)
{
if (bgpm)
G_THROW( ERR_MSG("DjVuFile.dupl_backgrnd") );
// First chunk
GP<IW44Image> bg44=IW44Image::create_decode(IW44Image::COLOR);
bg44->decode_chunk(gbs);
this->bg44 = bg44;
desc.format( ERR_MSG("DjVuFile.IW44_bg1") "\t%d\t%d\t%d",
bg44->get_width(), bg44->get_height(),
get_dpi(bg44->get_width(), bg44->get_height()));
}
else
{
// Refinement chunks
GP<IW44Image> bg44 = this->bg44;
bg44->decode_chunk(gbs);
desc.format( ERR_MSG("DjVuFile.IW44_bg2") "\t%d\t%d",
bg44->get_serial(), get_dpi(bg44->get_width(), bg44->get_height()));
}
}
// FG44 (foreground wavelets)
else if (chkid == "FG44" && (djvu || djvu))
{
if (fgpm || fgbc)
G_THROW( ERR_MSG("DjVuFile.dupl_foregrnd") );
GP<IW44Image> gfg44=IW44Image::create_decode(IW44Image::COLOR);
IW44Image &fg44=*gfg44;
fg44.decode_chunk(gbs);
fgpm=fg44.get_pixmap();
desc.format( ERR_MSG("DjVuFile.IW44_fg") "\t%d\t%d\t%d",