pc-tools/ldc2/src/tape_block.hh

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