libraw.alloc source code

1 module libraw.alloc;
2 
3 import libraw.const_;
4 
5 import core.stdc.stdlib;
6 import core.stdc..string;
7 
8 
9 enum LIBRAW_MSIZE = 512;
10 
11 extern(C++) class libraw_memmgr;
12 
13 /+extern(C++) class libraw_memmgr {
14   this(unsigned ee) 
15   {
16     extra_bytes = ee;
17     size_t alloc_sz = LIBRAW_MSIZE * (void*).sizeof;
18     mems = cast(void**).malloc(alloc_sz);
19     memset(mems, 0, alloc_sz);
20   }
21   ~this()
22   {
23     cleanup();
24     .free(mems);
25   }
26   void *malloc(size_t sz)
27   {
28     version (LIBRAW_USE_CALLOC_INSTEAD_OF_MALLOC) {
29       void *ptr = .calloc(sz + extra_bytes,1);
30     } else {
31       void *ptr = .malloc(sz + extra_bytes);
32     }
33     mem_ptr(ptr);
34     return ptr;
35   }
36   void *calloc(size_t n, size_t sz)
37   {
38     void *ptr = .calloc(n + (extra_bytes + sz - 1) / (sz ? sz : 1), sz);
39     mem_ptr(ptr);
40     return ptr;
41   }
42   void *realloc(void *ptr, size_t newsz)
43   {
44     void *ret = .realloc(ptr, newsz + extra_bytes);
45     forget_ptr(ptr);
46     mem_ptr(ret);
47     return ret;
48   }
49   void free(void *ptr)
50   {
51     forget_ptr(ptr);
52     .free(ptr);
53   }
54   void cleanup(void)
55   {
56     for (int i = 0; i < LIBRAW_MSIZE; i++)
57       if (mems[i])
58       {
59         .free(mems[i]);
60         mems[i] = NULL;
61       }
62   }
63 
64 private:
65   void **mems;
66   unsigned extra_bytes;
67   void mem_ptr(void *ptr)
68   {
69     if (ptr)
70     {
71       for (int i = 0; i < LIBRAW_MSIZE-1; i++)
72         if (!mems[i])
73         {
74           mems[i] = ptr;
75           return;
76         }
77       version (LIBRAW_MEMPOOL_CHECK) {
78         /* remember ptr in last mems item to be free'ed at cleanup */
79         if(!mems[LIBRAW_MSIZE-1]) mems[LIBRAW_MSIZE-1] = ptr;
80         throw LIBRAW_EXCEPTION_MEMPOOL;
81       }
82     }
83   }
84   void forget_ptr(void *ptr)
85   {
86     if (ptr)
87       for (int i = 0; i < LIBRAW_MSIZE; i++)
88         if (mems[i] == ptr)
89         {
90           mems[i] = NULL;
91           break;
92         }
93   }
94 }+/