84 lines
3.2 KiB
C
84 lines
3.2 KiB
C
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#ifndef HGL_IO_FILE_ACCESS_INCLUDE
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#define HGL_IO_FILE_ACCESS_INCLUDE
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#include<hgl/type/BaseString.h>
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#include<hgl/io/SeekAccess.h>
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#include<sys/stat.h>
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namespace hgl
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{
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namespace io
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{
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enum FileOpenMode ///文件访问模式枚举
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{
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fomNone=0,
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fomCreate, ///<创建文件，如存在则失败
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fomCreateTrunc, ///<强制创建，如存在则抹掉
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fomCreateTemp,
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fomOnlyRead, ///<只读方式
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fomOnlyWrite, ///<只写方式
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fomReadWrite, ///<可读可写
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fomAppend, ///<追加模式
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fomEnd
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};//enum FileOpenMode
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/**
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* 文件访问实例管理类
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*/
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class FileAccess ///文件访问实例管理类
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{
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protected:
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OSString filename;
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int fp;
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struct_stat64 file_state;
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FileOpenMode mode;
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public:
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FileAccess();
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virtual ~FileAccess();
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virtual bool Open(const OSString &,FileOpenMode fom); ///<以指定模式打开一个文件
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virtual bool Create(const OSString &fn){return Open(fn,fomCreate);} ///<创建一个新文件，如文件已存在则创建失败
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virtual bool CreateTrunc(const OSString &fn){return Open(fn,fomCreateTrunc);} ///<创建一个新文件，如文件已存在则抹消它
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virtual bool OpenRead(const OSString &fn){return Open(fn,fomOnlyRead);} ///<以只读模式打开一个文件
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virtual bool OpenWrite(const OSString &fn){return Open(fn,fomOnlyWrite);} ///<以只写模式打开一个文件
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virtual bool OpenReadWrite(const OSString &fn){return Open(fn,fomReadWrite);} ///<以读写模式打开一个文件
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virtual bool CreateTemp();
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virtual void Close(); ///<关闭文件
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virtual void CloseRead(); ///<仅关闭读取
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virtual void CloseWrite(); ///<仅关闭写入
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virtual int GetFileHandle()const{return fp;}
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virtual bool CanRead()const; ///<文件是否可读
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virtual bool CanPeek()const{return(CanRead()&&CanSeek());} ///<文件是否可预读
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virtual bool CanWrite()const; ///<文件是否可写
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virtual bool CanSeek()const; ///<文件是否可定位访问指针
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virtual bool CanRestart()const{return CanSeek();} ///<文件是否可复位访问
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virtual bool CanSize()const{return(true);} ///<文件是否可取得长度
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virtual int64 Seek(int64,SeekOrigin=soBegin); ///<定位访问指针
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virtual int64 Tell()const; ///<取得访问指针位置
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virtual int64 GetSize(); ///<取得文件长度
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virtual bool Restart(); ///<复位访问指针
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virtual int64 Read(void *,int64); ///<读取指定长度数据
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virtual int64 Peek(void *,int64); ///<预读指定长度数据
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virtual int64 Write(const void *,int64); ///<写入指定长度数据
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virtual int64 AvailableRead(); ///<剩下的可读数据
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virtual int64 Read(int64,void *,int64); ///<在指定位置读取指定长度的数据
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virtual int64 Write(int64,const void *,int64); ///<在指定位置写入指定长度的数据
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};//class FileAccess
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}//namespace io
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}//namespace hgl
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#endif//HGL_IO_FILE_ACCESS_INCLUDE
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