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inc/hgl/io/FileInputStream.h

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+#ifndef HGL_IO_FILE_INPUT_STREAM_INCLUDE
+#define HGL_IO_FILE_INPUT_STREAM_INCLUDE
+
+#include<hgl/io/InputStream.h>
+#include<hgl/io/FileAccess.h>
+namespace hgl
+{
+    namespace io
+    {
+        /**
+        * 文件输入流类
+        */
+        class FileInputStream:public InputStream                                                    ///文件输入流类
+        {
+        protected:
+
+            SharedPtr<FileAccess> file;                                                             ///<文件访问指针
+
+        public:
+
+            FileInputStream();
+            FileInputStream(SharedPtr<FileAccess> &);
+            virtual ~FileInputStream();
+
+            virtual bool    Open(const OSString &);                                                 ///<打开文件
+            virtual void    Close();                                                                ///<关闭文件输入流
+
+            virtual int     GetFileHandle()const{return file->GetFileHandle();}
+
+            virtual int64   Read(void *,int64);                                                     ///<读取数据
+            virtual int64   Peek(void *,int64);                                                     ///<预读数据
+
+            virtual bool    CanSeek()const;                                                         ///<是否可移动访问指针
+            virtual bool    CanRestart()const;                                                      ///<是否可复位访问
+            virtual bool    CanSize()const;                                                         ///<是否可访问文件长度
+            virtual bool    CanPeek()const;                                                         ///<是否可预读数据
+
+            virtual int64   Skip(int64);                                                            ///<跳过指定字节
+            virtual int64   Tell()const;                                                            ///<取当前位置
+            virtual int64   GetSize()const;                                                         ///<取得文件长度
+            virtual bool    Restart();                                                              ///<复位访问指针
+            virtual int64   Seek(int64,SeekOrigin=SeekOrigin::Begin);                               ///<移动访问指针
+
+            virtual int64   Available()const;                                                       ///<剩下的可以不受阻塞访问的字节数
+
+            virtual int64   Read(int64,void *,int64);                                               ///<在指定位置读取指定长度的数据
+        };//class FileInputStream
+
+        class OpenFileInputStream
+        {
+            FileInputStream *fis;
+
+        public:
+
+            OpenFileInputStream(const OSString &filename)
+            {
+                fis=new FileInputStream();
+
+                if(!fis->Open(filename))
+                {
+                    delete fis;
+                    fis=nullptr;
+                }
+            }
+
+            ~OpenFileInputStream()
+            {
+                SAFE_CLEAR(fis);
+            }
+
+            const bool operator !(){return !fis;}
+            operator FileInputStream *(){return fis;}
+            FileInputStream *operator &(){return fis;}
+            FileInputStream *operator ->(){return fis;}
+        };//class OpenFileInputStream
+    }//namespace io
+}//namespace hgl
+#endif//HGL_IO_FILE_INPUT_STREAM_INCLUDE