pc-tools/ldc2/src/data_block.cpp

   1 #include <stdlib.h>
   2 #include <string.h>
   3
   4 #include "data_block.hh"
   5 #include "data_block_0.hh"
   6
   7 #include <stdio.h>
   8
   9 using namespace std;
  10
  11 data_block::data_block(tape_block& idol)
  12   :tape_block(idol)
  13 {
  14 }
  15
  16 data_block::~data_block(){
  17 }
  18
  19 int data_block::get_type(){
  20   if ((init_state==TBS_OK)&&word_data)
  21     return (word_data[0]&0xf000)>>12;
  22   else
  23  return block_type;
  24 }
  25
  26 int data_block::get_subtype(){
  27   if (get_type()==0)
  28     return (new data_block_0(*this))->get_subtype();
  29   else return 0;
  30 }
  31
  32 /*!
  33  *\brief Get the block's size in 16 bit words.
  34  *\return The block's 16-bit data buffer's size including header and checksum.
  35  */
  36 int data_block::get_word_size(){
  37   return word_size;
  38 }
  39
  40 /*!
  41  *\brief Extract 6 byte symbol name from word memory.
  42  *
  43  *\param  startbyte the first byte of the desired symbol name
  44  *\return a string containing the symbol name.
  45  *        Trailing spaces are included.
  46  *\note The word_data is handled system-intependently big endian!
  47  */
  48 string data_block::extract_string(int startbyte){
  49   string result="";  // Start with empty string
  50
  51   // We don't accept negative arguments!
  52   if (startbyte<0) return result;
  53
  54   // We also don't want segmentation faults!
  55   if (word_size<(startbyte/2+1)) return result;
  56
  57   // Here we pick out the characters.
  58   for (int posi=startbyte;posi<startbyte+6;posi++)
  59     result+=(word_data[posi/2]>>(8*(1-posi%2)))&0x7f;
  60   return result;
  61 }