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Diffstat (limited to 'kviewshell/plugins/djvu/libdjvu/GSmartPointer.cpp')
| -rw-r--r-- | kviewshell/plugins/djvu/libdjvu/GSmartPointer.cpp | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/kviewshell/plugins/djvu/libdjvu/GSmartPointer.cpp b/kviewshell/plugins/djvu/libdjvu/GSmartPointer.cpp new file mode 100644 index 00000000..8c17755d --- /dev/null +++ b/kviewshell/plugins/djvu/libdjvu/GSmartPointer.cpp @@ -0,0 +1,256 @@ +//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: GSmartPointer.cpp,v 1.11 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 + +// - Author: Leon Bottou, 05/1997 + +// From: Leon Bottou, 1/31/2002 +// Class GPBuffer has been added (but not documented) by Lizardtech. +// Our original implementation consisted of multiple classes. +// <http://prdownloads.sourceforge.net/djvu/DjVu2_2b-src.tgz>. + +#include <string.h> +#include "GThreads.h" +#include "GSmartPointer.h" +#include "GException.h" + + +#ifdef HAVE_NAMESPACES +namespace DJVU { +# ifdef NOT_DEFINED // Just to fool emacs c++ mode +} +#endif +#endif + + +// ------ STATIC CRITICAL SECTION + +static GCriticalSection gcsCounter; + + +// ------ GPENABLED + + +GPEnabled::~GPEnabled() +{ + if (count > 0) + G_THROW( ERR_MSG("GSmartPointer.suspicious") ); +} + +void +GPEnabled::destroy() +{ + if (count >= 0) + G_THROW( ERR_MSG("GSmartPointer.suspicious") ); + delete this; +} + +void +GPEnabled::ref() +{ + gcsCounter.lock(); + count++; + gcsCounter.unlock(); +} + +void +GPEnabled::unref() +{ + gcsCounter.lock(); + if (! --count) + count = -1; + gcsCounter.unlock(); + if (count < 0) + destroy(); +} + + +// ------ GPBASE + + +GPBase& +GPBase::assign (GPEnabled *nptr) +{ + gcsCounter.lock(); + if (nptr) + { + if (nptr->count >= 0) + nptr->count++; + else + nptr = 0; + } + if (ptr) + { + GPEnabled *old = ptr; + ptr = nptr; + if (! --old->count) + old->count = -1; + gcsCounter.unlock(); + if (old->count < 0) + old->destroy(); + } + else + { + ptr = nptr; + gcsCounter.unlock(); + } + return *this; +} + +GPBase& +GPBase::assign (const GPBase &sptr) +{ + gcsCounter.lock(); + if (sptr.ptr) + { + sptr.ptr->count++; + } + if (ptr) + { + GPEnabled *old = ptr; + ptr = sptr.ptr; + if (! --old->count) + old->count = -1; + gcsCounter.unlock(); + if (old->count < 0) + old->destroy(); + } + else + { + ptr = sptr.ptr; + gcsCounter.unlock(); + } + return *this; +} + + +// ------ GPBUFFERBASE + + +void +GPBufferBase::replace(void *nptr,const size_t n) +{ + resize(0,0); + ptr=nptr; + num=n; +} + +GPBufferBase::GPBufferBase(void *&xptr,const size_t n,const size_t t) + : ptr(xptr), num(n) +{ + if (n) + xptr = ::operator new(n*t); + else + xptr = 0; +} + +GPBufferBase::~GPBufferBase() +{ + ::operator delete(ptr); +} + +void +GPBufferBase::swap(GPBufferBase &other) +{ + void * const temp_ptr=ptr; + ptr=other.ptr; + other.ptr=temp_ptr; + const size_t temp_num=num; + num=other.num; + other.num=temp_num; +} + +void +GPBufferBase::resize(const size_t n, const size_t t) +{ + if(!n && !ptr) + { + num=0; + } + else + { + const size_t s=ptr?(((num<n)?num:n)*t):0; + void *nptr; + GPBufferBase gnptr(nptr, n, t); + if(s) + { + memcpy(nptr, ptr, s); + } + swap(gnptr); + } +} + +void +GPBufferBase::set(const size_t t,const char c) +{ + if(num) + memset(ptr,c,num*t); +} + + +#ifdef HAVE_NAMESPACES +} +# ifndef NOT_USING_DJVU_NAMESPACE +using namespace DJVU; +# endif +#endif + |