pc-tools/ldc2/src/tape_block.hh

   1 #ifndef TAPE_BLOCK_H
   2 #define TAPE_BLOCK_H
   3
   4 #include <string>
   5 #include <vector>
   6
   7 using namespace std;
   8
   9 /*!
  10  *\brief Tape data block base class.
  11  *
  12  * This class represents a Honeywell paper tape block.
  13  * That may be some kind of data block or a end of tape mark.
  14  */
  15 class tape_block{
  16
  17 public: // types
  18
  19   /*!
  20    *\brief Initialisation state.
  21    */
  22   typedef enum {
  23     TBS_OK,          //!< Block successfully initialised
  24     TBS_EOF_LEGAL,   //!< Legal EOF while initialising
  25     TBS_EOF_ILLEGAL, //!< Illegal EOF while initialising
  26     TBS_CHECKSUM,    //!< Checksum error
  27     TBS_IOERR,       //!< I/O-Error while reading
  28     TBS_DEFAULT      //!< Block not initialised.
  29   } tb_state_t;
  30
  31   /*!
  32    * Tape block types.
  33    */
  34   typedef enum {
  35     TBT_DATA=0x10,   //!< Data block
  36     TBT_EOT,         //!< End of tape block
  37     TBT_DISCARD      //!< Invalid block, check block_type
  38   } tb_type_t;
  39
  40 public: // methods
  41   virtual ~tape_block();
  42
  43   tape_block(tape_block &);
  44   void operator=(tape_block &);
  45
  46   tb_state_t get_state();
  47   virtual int get_type();
  48   virtual int get_subtype();
  49   virtual vector<string> get_description();
  50   int get_raw_size();
  51   int get_discarded_bytes();
  52   unsigned char * get_raw_data();
  53
  54   static tape_block * gen_from_fd(int  fd,
  55                                   void(*input_start)(void *)=0,
  56                                   void (*input_stop)(void *)=0,
  57                                   void * start_stop_arg=0
  58                                   );
  59
  60 protected:   // methods
  61   tape_block();
  62   string get_typestring();
  63
  64 private:   // methods
  65   tape_block (int  fd_p,
  66               void(*input_start)(void *)=0,
  67               void (*input_stop)(void *)=0,
  68               void * start_stop_arg=0
  69               );
  70
  71   int init_words(void);
  72   int test_checksum();
  73
  74 protected: // members
  75   int block_type;             //!< Type of this block.
  76   tb_state_t init_state;      //!< Initialisation state.
  77   int discarded_bytes;        //!< Amount of bytes discarded before beginning.
  78   unsigned char * raw_data;   //!< Raw block data in bytes.
  79   int raw_size;               //!< Size of the raw data.
  80   unsigned short * word_data; //!< Data organized in machine words.
  81   int word_size;              //!< Size of the blocks in machine words.
  82   int poolsize;               //!< Amount of data malloc'ed
  83 }; // class tape_block
  84
  85
  86 #endif