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[h316.git] / pc-tools / ldc2 / src / tape_block.hh

#ifndef TAPE_BLOCK_HH
#define TAPE_BLOCK_HH

using namespace std;

/*!
 *\brief Tape data block base class.
 *
 * This class represents a Honeywell paper tape block.
 * That may be some kind of data block or a end of tape mark.
 */
class tape_block{
  
public: // types
  
  /*!
   * Tape block types.
   */
  typedef enum {
    TBT_DATA=0x10,   //!< Data block
    TBT_EOT,         //!< End of tape block
    TBT_BROKEN,      //!< A broken block
  } tb_type_t;
  
  /*!
   *\brief Local base class for exceptions.
   */
  class exception {
  protected:
    exception();
  public:
    virtual ~exception();
    tape_block * get_block();
  protected:
    tape_block * m_broken_block;
  };
  
  /*!
   *\brief Checksum error exception.
   */
  class checksum_error_exception
    : public exception {
  public:
    checksum_error_exception(tape_block * block);
  };
  
  /*!
   *\brief EOF while reading block exception.
   */
  class eof_illegal_exception
    : public exception {
  public:
    eof_illegal_exception(tape_block * block);
  };
  
  /*!
   *\brief EOF after reading block exception.
   */
  class eof_legal_exception
    : public exception {
  public:
    eof_legal_exception(int bytes_consumed);
    int get_consumed();
  private:
    int bytes_consumed;
    tape_block * get_block();
  };
  
  /*!
   *\brief IO error exception.
   */
  class io_error_exception
    : exception {
  public:
    io_error_exception();
  private:
    tape_block * get_block();
  };
  
public: // methods
  virtual ~tape_block();
  
  tape_block(tape_block &);
  void operator=(tape_block &);
  
  virtual int get_type();
  virtual int get_subtype();
  virtual vector<string> get_description();
  int get_raw_size();
  int get_discarded_bytes();
  unsigned char * get_raw_data();
  
  static tape_block * gen_from_fd(int  fd,
				  void(*input_start)(void *)=0,
				  void (*input_stop)(void *)=0,
				  void * start_stop_arg=0
				  );
  
protected:   // methods
  tape_block();
  string get_typestring();
  
private:   // methods
  tape_block (int  fd_p,
	      void(*input_start)(void *)=0,
	      void (*input_stop)(void *)=0,
	      void * start_stop_arg=0
	      );
  
  int init_words(void);
  int test_checksum(); 
  
protected: // members
  int block_type;             //!< Type of this block.
  int discarded_bytes;        //!< Amount of bytes discarded before beginning.
  unsigned char * raw_data;   //!< Raw block data in bytes.
  int raw_size;               //!< Size of the raw data.
  unsigned short * word_data; //!< Data organized in machine words.
  int word_size;              //!< Size of the blocks in machine words.
  int poolsize;               //!< Amount of data malloc'ed 
}; // class tape_block

#endif