Port to CMake, get rid of os_int.h.

[stg.git] / libs / dotconfpp / mempool.cpp

diff --git a/libs/dotconfpp/mempool.cpp b/libs/dotconfpp/mempool.cpp
new file mode 100644 (file)
index 0000000..3469418
--- /dev/null
+++ b/libs/dotconfpp/mempool.cpp
@@ -0,0 +1,116 @@
+/*  Copyright (C) 2003 Aleksey Krivoshey <voodoo@foss.kharkov.ua>
+*
+*   This program is free software; you can redistribute it and/or modify
+*   it under the terms of the GNU General Public License as published by
+*   the Free Software Foundation; either version 2 of the License, or
+*   (at your option) any later version.
+*
+*   This program is distributed in the hope that it will be useful,
+*   but WITHOUT ANY WARRANTY; without even the implied warranty of
+*   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+*   GNU General Public License for more details.
+*
+*   You should have received a copy of the GNU General Public License
+*   along with this program; if not, write to the Free Software
+*   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+
+#include "mempool.h"
+
+AsyncDNSMemPool::PoolChunk::PoolChunk(size_t _size):
+    pool(NULL), pos(0), size(_size)
+{
+    pool = ::malloc(size);
+}
+
+AsyncDNSMemPool::PoolChunk::~PoolChunk()
+{
+    ::free(pool);
+}
+
+AsyncDNSMemPool::AsyncDNSMemPool(size_t _defaultSize):
+    chunks(NULL), chunksCount(0), defaultSize(_defaultSize),
+    poolUsage(0), poolUsageCounter(0)
+{
+}
+
+AsyncDNSMemPool::~AsyncDNSMemPool()
+{    
+    for(size_t i = 0; i<chunksCount; i++){
+        delete chunks[i];
+    }
+    ::free(chunks);
+}
+
+int AsyncDNSMemPool::initialize()
+{
+    chunksCount = 1;
+    chunks = (PoolChunk**)::malloc(sizeof(PoolChunk*));
+    if(chunks == NULL)
+        return -1;
+
+    chunks[chunksCount-1] = new PoolChunk(defaultSize);
+
+    return 0;
+}
+
+void AsyncDNSMemPool::addNewChunk(size_t size)
+{
+    chunksCount++;
+    chunks = (PoolChunk**)::realloc(chunks, chunksCount*sizeof(PoolChunk*));
+    if(size <= defaultSize)
+        chunks[chunksCount-1] = new PoolChunk(defaultSize);
+    else
+        chunks[chunksCount-1] = new PoolChunk(size);
+}
+
+void * AsyncDNSMemPool::alloc(size_t size)
+{
+    PoolChunk * chunk = NULL;
+    for(size_t i = 0; i<chunksCount; i++){
+        chunk = chunks[i];
+        if((chunk->size - chunk->pos) >= size){
+            chunk->pos += size;
+            return ((u_int8_t*)chunk->pool) + chunk->pos - size;
+        }
+    }
+    addNewChunk(size);
+    chunks[chunksCount-1]->pos = size;
+    return chunks[chunksCount-1]->pool;
+}
+
+void AsyncDNSMemPool::free()
+{    
+    size_t pu = 0;
+    size_t psz = 0;
+    poolUsageCounter++;
+
+    for(size_t i = 0; i<chunksCount; i++){
+        pu += chunks[i]->pos;
+        psz += chunks[i]->size;
+        chunks[i]->pos = 0;
+    }
+    poolUsage=(poolUsage>pu)?poolUsage:pu;
+
+    if(poolUsageCounter >= 10 && chunksCount > 1){
+        psz -= chunks[chunksCount-1]->size;
+        if(poolUsage < psz){
+            chunksCount--;
+            delete chunks[chunksCount];
+        }
+        poolUsage = 0;
+        poolUsageCounter = 0;
+    }
+}
+
+void * AsyncDNSMemPool::calloc(size_t size)
+{
+    return ::memset(this->alloc(size), 0, size);
+}
+
+char * AsyncDNSMemPool::strdup(const char *str)
+{
+    return ::strcpy((char*)this->alloc(strlen(str)+1), str);
+}
+