inputsrc.h

伯克利做的SFTP安全文件传输协议

// inputsrc.h
// generic interface for a streaming input source
// copyright SafeTP Development Group, Inc., 2000  Terms of use are as specified in license.txt

// 6/7/99: added an output counterpart

#ifndef __INPUTSRC_H
#define __INPUTSRC_H

#include "typ.h"      // bool

class StreamInputSource {
public:
  // (blocking) read from 1 to 'buflen' bytes, storing them in 'buffer'
  // and returning the # of bytes read; return 0 on graceful
  // EOF and throw an exception on failure
  virtual int read(char *buffer, int buflen)=0;

  // nonblocking poll for availability of data or input source closure;
  // returns true for data ready, false for nothing ready;
  // default implementation assumes the stream isn't a communications
  // mechanism, and therefore it never makes sense to wait for additional
  // information (which is what poll()==false would mean)
  virtual bool poll() { return true; }
};


class StreamOutputDest {
public:
  // (blocking) write all 'len' bytes
  virtual void write(char const *data, int len)=0;
};

#endif // __INPUTSRC_H