48 lines
2.5 KiB
C
48 lines
2.5 KiB
C
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#ifndef HGL_IO_RANDOM_ACCESS_FILE_INCLUDE
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#define HGL_IO_RANDOM_ACCESS_FILE_INCLUDE
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#include<hgl/io/InputStream.h>
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#include<hgl/io/OutputStream.h>
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#include<hgl/io/FileAccess.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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/**
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* 随机文件访问</p>
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* 可同时被DataInputStream/DataOutputStream包含引用，但需注意他们将共用一个访问指针
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*/
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class RandomAccessFile:public InputStream,public OutputStream
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{
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protected:
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SharedPtr<FileAccess> file; ///<文件访问指针
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public:
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RandomAccessFile();
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RandomAccessFile(SharedPtr<FileAccess> &);
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~RandomAccessFile();
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virtual bool Open(const OSString &); ///<打开文件
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virtual void Close(); ///<关闭文件
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virtual int64 Read(void *,int64); ///<读取数据
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virtual int64 Write(const void *,int64); ///<写入数据
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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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virtual bool CanSeek()const; ///<是否可移动访问指针
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virtual bool CanRestart()const; ///<是否可复位访问
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virtual bool CanSize()const; ///<是否可访问文件长度
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virtual int64 Tell()const; ///<取当前位置
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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 Seek(int64,SeekOrigin=SeekOrigin::Begin); ///<移动访问指针
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};//class RandomAccessFile
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}//namespace io
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}//namespace hgl
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#endif//HGL_IO_RANDOM_ACCESS_FILE_INCLUDE
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