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1 /*! \file exif-mem.h
2  *  \brief Define the ExifMem data type and the associated functions.
3  *  ExifMem defines the memory management functions used within libexif.
4  */
5 /* exif-mem.h
6  *
7  * Copyright (c) 2003 Lutz Mueller <lutz@users.sourceforge.net>
8  *
9  * This library is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2 of the License, or (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the
21  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
22  * Boston, MA  02110-1301  USA.
23  */
24 
25 #ifndef __EXIF_MEM_H__
26 #define __EXIF_MEM_H__
27 
28 #include <libexif/exif-utils.h>
29 
30 #ifdef __cplusplus
31 extern "C" {
32 #endif /* __cplusplus */
33 
34 /*! Should work like calloc()
35  *
36  *  \param[in] s the size of the block to allocate.
37  *  \return the allocated memory and initialized.
38  */
39 typedef void * (* ExifMemAllocFunc)   (ExifLong s);
40 
41 /*! Should work like realloc()
42  *
43  * \param[in] p the pointer to reallocate
44  * \param[in] s the size of the reallocated block
45  * \return allocated memory
46  */
47 typedef void * (* ExifMemReallocFunc) (void *p, ExifLong s);
48 
49 /*! Free method for ExifMem
50  *
51  * \param[in] p the pointer to free
52  * \return the freed pointer
53  */
54 typedef void   (* ExifMemFreeFunc)    (void *p);
55 
56 /*! ExifMem define a memory allocator */
57 typedef struct _ExifMem ExifMem;
58 
59 /*! Create a new ExifMem
60  *
61  * \param[in] a the allocator function
62  * \param[in] r the reallocator function
63  * \param[in] f the free function
64  */
65 ExifMem *exif_mem_new   (ExifMemAllocFunc a, ExifMemReallocFunc r,
66 			 ExifMemFreeFunc f);
67 /*! Refcount an ExifMem
68  */
69 void     exif_mem_ref   (ExifMem *);
70 
71 /*! Unrefcount an ExifMem.
72  * If the refcount reaches 0, the ExifMem is freed
73  */
74 void     exif_mem_unref (ExifMem *);
75 
76 void *exif_mem_alloc   (ExifMem *m, ExifLong s);
77 void *exif_mem_realloc (ExifMem *m, void *p, ExifLong s);
78 void  exif_mem_free    (ExifMem *m, void *p);
79 
80 /*! Create a new ExifMem with default values for your convenience
81  *
82  * \return return a new default ExifMem
83  */
84 ExifMem *exif_mem_new_default (void);
85 
86 #ifdef __cplusplus
87 }
88 #endif /* __cplusplus */
89 
90 #endif /* __EXIF_MEM_H__ */
91