From 988562ea48e493ea9cb6ab176bc5e64a04360db0 Mon Sep 17 00:00:00 2001
From: hyzboy <hyzboy@gmail.com>
Date: Mon, 20 May 2019 20:39:37 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=8A=A0memblock.h?=
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---
 inc/hgl/type/MemBlock.h | 203 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 203 insertions(+)
 create mode 100644 inc/hgl/type/MemBlock.h

diff --git a/inc/hgl/type/MemBlock.h b/inc/hgl/type/MemBlock.h
new file mode 100644
index 00000000..3acd1732
--- /dev/null
+++ b/inc/hgl/type/MemBlock.h
@@ -0,0 +1,203 @@
+#ifndef HGL_MEM_BLOCK_INCLUDE
+#define HGL_MEM_BLOCK_INCLUDE
+
+#include<hgl/type/DataType.h>
+#include<hgl/io/FileInputStream.h>
+#include<hgl/filesystem/FileSystem.h>
+#include<hgl/thread/ThreadMutex.h>
+namespace hgl
+{
+    /**
+     * 内存块模版
+     */
+    template<typename T> class MemBlock
+    {
+    protected:
+
+        T *buf;
+        size_t cur_size;
+        size_t buf_size;
+
+    public:
+
+                size_t GetLength	()const{return cur_size;}										///<取得内存块长度(注：非字节数)
+        const	size_t GetMaxLength	()const{return buf_size;}										///<取得内存块最大长度(注：非字节数)
+        const	size_t GetBytes		()const{return cur_size*sizeof(T);}								///<取得内存块字节数
+        const	size_t GetMaxBytes	()const{return buf_size*sizeof(T);}								///<取得内存块最大字节数
+
+        /**
+         * 分配指定空间出来，供未来使用
+         */
+        void Malloc(size_t size)
+        {
+            if(size<=buf_size)
+                return;
+
+            buf_size=power_to_2(size);
+
+            if(!buf)
+                buf=(T *)hgl_malloc(buf_size*sizeof(T));
+            else
+                buf=(T *)hgl_realloc(buf,buf_size*sizeof(T));
+        }
+
+        /**
+         * 设置当前数据长度
+         */
+        void SetLength(size_t size)																	///<设置内存块长度(注：非字节数)
+        {
+            Malloc(size);
+
+            cur_size=size;
+        }
+
+        void AddLength(size_t size)
+        {
+            SetLength(cur_size+size);
+        }
+
+    public:
+
+        MemBlock()
+        {
+            buf=0;
+            cur_size=0;
+            buf_size=0;
+        }
+
+        MemBlock(size_t size)
+        {
+            if(size<=0)
+                buf=0;
+            else
+                buf=(T *)hgl_malloc(size*sizeof(T));
+
+            if(buf)
+            {
+                cur_size=size;
+                buf_size=size;
+            }
+            else
+            {
+                cur_size=0;
+                buf_size=0;
+            }
+        }
+
+        virtual ~MemBlock()
+        {
+            Clear();
+        }
+
+        void Clear()
+        {
+            if(buf)
+                hgl_free(buf);
+
+            cur_size=0;
+            buf_size=0;
+        }
+
+        void ClearData()
+        {
+            cur_size=0;
+        }
+
+        void Zero()
+        {
+            if(buf)
+                memset(buf,0,buf_size);
+        }
+
+        /**
+         * 设置数据,请保证数据使用hgl_malloc分配，否则会因为释放函数不配对出现错误
+         */
+        void SetData(T *d,int s)
+        {
+            Clear();
+
+            buf=d;
+            buf_size=s;
+            cur_size=s;
+        }
+
+        /**
+         * 解除数据关联
+         */
+        void Unlink()
+        {
+            buf=nullptr;
+            cur_size=0;
+            buf_size=0;
+        }
+
+        /**
+         * 复制内存块中的数据
+         * @param d 复制出来的缓冲区指针
+         * @param s 要复制出来的数据个数
+         */
+        void CopyData(T *d,int s)
+        {
+            SetLength(s);
+            memcpy(buf,d,s*sizeof(T));
+        }
+
+        T *data()const{return buf;}
+        T *GetData()const{return buf;}
+
+        size_t length()const{return cur_size;}
+        size_t GetCount()const{return cur_size;}
+
+        size_t bytes()const
+        {
+            return cur_size*sizeof(T);
+        }
+
+        operator T *()const
+        {
+            return buf;
+        }
+
+        T *operator ->()const
+        {
+            return buf;
+        }
+
+        T &operator[](int n)
+        {
+            return buf+n;
+        }
+    };//template<typename T> class MemBlock
+
+    /**
+     * 加载一个文件到内存块类中
+     */
+    template<typename T> MemBlock<T> *LoadFileToMemBlock(const OSString &filename)
+    {
+        io::FileInputStream fis;
+
+        if(!fis.Open(filename))return(nullptr);
+
+        const size_t file_size	=fis.GetSize();
+        const size_t size		=(file_size+sizeof(T)-1)/sizeof(T);
+
+        MemBlock<T> *mb=new MemBlock<T>(size);
+
+        fis.Read(mb->data(),file_size);
+
+        return(mb);
+    }
+
+    /**
+     * 保存一个内存块到文件
+     */
+    template<typename T> bool SaveMemBlockToFile(const OSString &filename,const MemBlock<T> &mb)
+    {
+        const size_t size=mb.bytes();
+
+        if(size<=0)return(true);
+
+        return(hgl::filesystem::SaveMemoryToFile(filename,mb.data(),mb.bytes())==size);
+    }
+}//namespace hgl
+#endif//HGL_MEM_BLOCK_INCLUDE