added Mem_ExpandableArray functions, which are not currently used but

may be useful

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@7127 d7cf8633-e32d-0410-b094-e92efae38249

diff --git a/zone.c b/zone.c
index fc75486b45ad79db75b79dd56939bdb3099914b7..0bb325385f1ded23fe763e170f93bdadeb954bde 100644 (file)
--- a/zone.c
+++ b/zone.c
@@ -380,6 +380,84 @@ qboolean Mem_IsAllocated(mempool_t *pool, void *data)
        return false;
 }
 
+void Mem_ExpandableArray_NewArray(memexpandablearray_t *l, mempool_t *mempool, size_t recordsize, int numrecordsperarray)
+{
+       memset(l, 0, sizeof(*l));
+       l->mempool = mempool;
+       l->recordsize = recordsize;
+       l->numrecordsperarray = numrecordsperarray;
+}
+
+void Mem_ExpandableArray_FreeArray(memexpandablearray_t *l)
+{
+       size_t i;
+       if (l->maxarrays)
+       {
+               for (i = 0;i != l->numarrays;l++)
+                       Mem_Free(l->arrays[i].data);
+               Mem_Free(l->arrays);
+       }
+       memset(l, 0, sizeof(*l));
+}
+
+void *Mem_ExpandableArray_AllocRecord(memexpandablearray_t *l)
+{
+       size_t i, j;
+       for (i = 0;;i++)
+       {
+               if (i == l->numarrays)
+               {
+                       if (l->numarrays == l->maxarrays)
+                       {
+                               memexpandablearray_array_t *oldarrays = l->arrays;
+                               l->maxarrays = max(l->maxarrays * 2, 128);
+                               l->arrays = Mem_Alloc(l->mempool, l->maxarrays * sizeof(*l->arrays));
+                               if (oldarrays)
+                               {
+                                       memcpy(l->arrays, oldarrays, l->numarrays * sizeof(*l->arrays));
+                                       Mem_Free(oldarrays);
+                               }
+                       }
+                       l->arrays[i].numflaggedrecords = 0;
+                       l->arrays[i].data = Mem_Alloc(l->mempool, (l->recordsize + 1) * l->numrecordsperarray);
+                       l->arrays[i].allocflags = l->arrays[i].data + l->recordsize * l->numrecordsperarray;
+                       l->numarrays++;
+               }
+               if (l->arrays[i].numflaggedrecords < l->numrecordsperarray)
+               {
+                       for (j = 0;j < l->numrecordsperarray;j++)
+                       {
+                               if (!l->arrays[i].allocflags[j])
+                               {
+                                       l->arrays[i].allocflags[j] = true;
+                                       l->arrays[i].numflaggedrecords++;
+                                       return (void *)(l->arrays[i].data + l->recordsize * j);
+                               }
+                       }
+               }
+       }
+}
+
+void Mem_ExpandableArray_FreeRecord(memexpandablearray_t *l, void *record)
+{
+       size_t i, j;
+       unsigned char *p = (unsigned char *)record;
+       for (i = 0;i != l->numarrays;i++)
+       {
+               if (p >= l->arrays[i].data && p < (l->arrays[i].data + l->recordsize * l->numrecordsperarray))
+               {
+                       j = (p - l->arrays[i].data) / l->recordsize;
+                       if (p != l->arrays[i].data + j * l->recordsize)
+                               Sys_Error("Mem_ExpandableArray_FreeRecord: no such record %p\n", p);
+                       if (!l->arrays[i].allocflags[j])
+                               Sys_Error("Mem_ExpandableArray_FreeRecord: record %p is already free!\n", p);
+                       l->arrays[i].allocflags[j] = false;
+                       l->arrays[i].numflaggedrecords--;
+                       return;
+               }
+       }
+}
+
 
 // used for temporary memory allocations around the engine, not for longterm
 // storage, if anything in this pool stays allocated during gameplay, it is

diff --git a/zone.h b/zone.h
index 285facca38ea9a8f0920aa3b2e8e0bffb9dd3a22..d70b967782082fce9adba07433f258b04f4c1cf1 100644 (file)
--- a/zone.h
+++ b/zone.h
@@ -135,6 +135,30 @@ void _Mem_CheckSentinelsGlobal(const char *filename, int fileline);
 // if pool is NULL this searches ALL pools for the allocation
 qboolean Mem_IsAllocated(mempool_t *pool, void *data);
 
+typedef struct memexpandablearray_array_s
+{
+       unsigned char *data;
+       unsigned char *allocflags;
+       size_t numflaggedrecords;
+}
+memexpandablearray_array_t;
+
+typedef struct memexpandablearray_s
+{
+       mempool_t *mempool;
+       size_t recordsize;
+       size_t numrecordsperarray;
+       size_t numarrays;
+       size_t maxarrays;
+       memexpandablearray_array_t *arrays;
+}
+memexpandablearray_t;
+
+void Mem_ExpandableArray_NewArray(memexpandablearray_t *l, mempool_t *mempool, size_t recordsize, int numrecordsperarray);
+void Mem_ExpandableArray_FreeArray(memexpandablearray_t *l);
+void *Mem_ExpandableArray_AllocRecord(memexpandablearray_t *l);
+void Mem_ExpandableArray_FreeRecord(memexpandablearray_t *l, void *record);
+
 // used for temporary allocations
 extern mempool_t *tempmempool;