base64t.h

伯克利做的SFTP安全文件传输协议

// base64t.h
// base-64 functions, Transform interface
// copyright SafeTP Development Group, Inc., 2000  Terms of use are as specified in license.txt

#ifndef __BASE64T_H
#define __BASE64T_H

#include "trans.h"         // Trans
#include "str.h"           // string


// encode 8-bit data as 6-bit data
class Base64Encoder : public Trans {
public:
  virtual int minInputSize() const;
  virtual int maxInputSize() const;
  virtual int minOutputSize(int inputSize) const;
  virtual int maxOutputSize(int inputSize) const;
  virtual void trans(DataBlock &data);
};


// decode 6-bit data to 8-bit data
class Base64Decoder : public Trans {
public:
  virtual int minInputSize() const;
  virtual int maxInputSize() const;
  virtual int minOutputSize(int inputSize) const;
  virtual int maxOutputSize(int inputSize) const;
  virtual void trans(DataBlock &data);
};


// globally accessible objects
// these don't have state, so even though they're not marked const,
// they are thread-safe
extern Base64Encoder base64encoder;
extern Base64Decoder base64decoder;
extern TransPair base64pair;


// some slightly different interfaces
void base64decode(DataBlock &dest, char const *srcEncoded);
  // allocate and write to 'dest'

string base64encode(DataBlock const &src);
  // allocate and write to 'dest', does not modify 'src'


// use this, instead of strlen, to retrieve the buffer length of
// some base64 data (it includes the null terminator in the length,
// because the base64 process produces a null-terminated string)
int base64length(char const *base64EncodedString);


#endif // __BASE64T_H