37 lines
1.7 KiB
C
37 lines
1.7 KiB
C
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#ifndef HGL_IO_SEEK_ACCESS_INCLUDE
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#define HGL_IO_SEEK_ACCESS_INCLUDE
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#include<hgl/type/DataType.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 class SeekOrigin /// 资源偏移方向枚举
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{
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Begin=0, ///<从资源最开始处开始，offset必须大于0。移到资源的offset位置
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Current, ///<从资源当前位置开始，移到资源的Position+offset位置
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End ///<从资源的结束位置开始，offset必须小于0，表示结束前的字符数
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};//enum SeekOrigin
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/**
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* 定位访问功能基类
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*/
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class SeekAccess
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{
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public:
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virtual ~SeekAccess()=default;
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virtual bool CanRestart()const=0; ///<是否可以复位
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virtual bool CanSeek()const=0; ///<是否可以定位
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virtual bool CanSize()const=0; ///<是否可以取得尺寸
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virtual bool Restart()=0; ///<复位访问指针
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virtual int64 Seek(int64,SeekOrigin=SeekOrigin::Begin)=0; ///<移动访问指针
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virtual int64 Tell()const=0; ///<返回当前访问位置
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virtual int64 GetSize()const=0; ///<取得文件长度
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};//class SeekAccess
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}//namespace io
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}//namespace hgl
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#endif//HGL_IO_SEEK_ACCESS_INCLUDE
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