File: GSmartPointer.cpp

package info (click to toggle)
djvulibre 3.5.27.1-10
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 9,664 kB
  • sloc: cpp: 65,465; xml: 5,723; ansic: 4,936; sh: 865; makefile: 316
file content (210 lines) | stat: -rw-r--r-- 5,781 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
//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- +------------------------------------------------------------------

#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 <stddef.h>
#include <string.h>
#if PARANOID_DEBUG
# include <assert.h>
#endif

#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


// ------ GPENABLED

GPEnabled::~GPEnabled()
{
#if DISABLED_BECAUSE_OF_CXX11_DESTRUCTORS_BEING_NOEXCEPT
  if (count > 0)
    G_THROW( ERR_MSG("GSmartPointer.suspicious") );
#endif
}

void
GPEnabled::destroy()
{
  // Only delete if the counter is still zero.
  // because someone may have rescued the object...
  // If yes, set the counter to -0x7fff to mark 
  // the object as doomed and make sure things
  // will work if the destructor uses a GP...
  if (! atomicCompareAndSwap(&count, 0, -0x7fff))
    delete this;
}


// ------ GPBASE


GPBase&
GPBase::assign (const GPBase &sptr)
{
  GPEnabled *nptr = sptr.ptr;
  if (nptr && atomicIncrement(&nptr->count) <= 0)
    nptr = 0;
  GPEnabled *optr = (GPEnabled*)atomicExchangePointer((void**)&ptr, (void*)nptr);
  if (optr)
    optr->unref();
  return *this;
}

GPBase&
GPBase::assign (GPEnabled *nptr)
{
  if (nptr && atomicIncrement(&nptr->count) <= 0)
    nptr = 0;
  GPEnabled *optr = (GPEnabled*)atomicExchangePointer((void**)&ptr, (void*)nptr);
  if (optr)
    optr->unref();
  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