79 lines
3.4 KiB
C++
79 lines
3.4 KiB
C++
#ifndef HGL_IO_FILE_INPUT_STREAM_INCLUDE
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#define HGL_IO_FILE_INPUT_STREAM_INCLUDE
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#include<hgl/io/InputStream.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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* 文件输入流类
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*/
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class FileInputStream:public InputStream ///文件输入流类
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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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FileInputStream();
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FileInputStream(SharedPtr<FileAccess> &);
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virtual ~FileInputStream();
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virtual bool Open(const OSString &); ///<打开文件
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virtual void Close(); ///<关闭文件输入流
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virtual int GetFileHandle()const{return file->GetFileHandle();}
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virtual int64 Read(void *,int64); ///<读取数据
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virtual int64 Peek(void *,int64); ///<预读数据
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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 bool CanPeek()const; ///<是否可预读数据
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virtual int64 Skip(int64); ///<跳过指定字节
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virtual int64 Tell()const; ///<取当前位置
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virtual int64 GetSize()const; ///<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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virtual int64 Available()const; ///<剩下的可以不受阻塞访问的字节数
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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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};//class FileInputStream
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class OpenFileInputStream
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{
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FileInputStream *fis;
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public:
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OpenFileInputStream(const OSString &filename)
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{
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fis=new FileInputStream();
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if(!fis->Open(filename))
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{
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delete fis;
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fis=nullptr;
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}
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}
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~OpenFileInputStream()
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{
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SAFE_CLEAR(fis);
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}
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const bool operator !(){return !fis;}
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operator FileInputStream *(){return fis;}
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FileInputStream *operator &(){return fis;}
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FileInputStream *operator ->(){return fis;}
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};//class OpenFileInputStream
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}//namespace io
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}//namespace hgl
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#endif//HGL_IO_FILE_INPUT_STREAM_INCLUDE
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