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 /*!
  12  *\brief Specialisation constructor.
  13  */
  14 data_block::data_block(tape_block& org)
  15   :tape_block(org)
  16 {}
  17
  18 /*!
  19  *\brief Determine block type.
  20  *\return the block type extracted from the block's data.
  21  */
  22 int data_block::get_type(){
  23   if ((init_state==TBS_OK)&&word_data)
  24     return (word_data[0]&0xf000)>>12;
  25   else
  26  return block_type;
  27 }
  28
  29 /*!
  30  *\brief Get the block's size in 16 bit words.
  31  *\return The block's 16-bit data buffer's size including
  32  *         header and checksum.
  33  */
  34 int data_block::get_word_size(){
  35   return word_size;
  36 }
  37
  38 /*!
  39  *\brief Describe the block.
  40  *\return A vector of text lines describing this block.
  41  */
  42 vector<string> data_block::get_description(){
  43   vector<string> result;
  44   string r_string="*****      "+get_typestring()+"Untyped data block, this \
  45  is an illegal condition!";
  46   result.insert(result.end(),r_string);
  47   return result;
  48 }
  49
  50 /*!
  51  *\brief Extract 6 byte symbol name from word memory.
  52  *
  53  *\param  firstbyte the first byte of the desired symbol name
  54  *\return a string containing the symbol name.
  55  *        Trailing spaces are included.
  56  *\note The word_data is handled system-intependently big endian!
  57  */
  58 string data_block::extract_label(int firstbyte){
  59   string result="";  // Start with empty string
  60
  61   // We don't accept negative arguments!
  62   if (firstbyte<0) return result;
  63
  64   // We also don't want segmentation faults!
  65   if (word_size<(firstbyte/2+1)) return result;
  66
  67   // Here we pick out the characters.
  68   for (int posi=firstbyte;posi<firstbyte+6;posi++)
  69     result+=(word_data[posi/2]>>(8*(1-posi%2)))&0x7f;
  70   return result;
  71 }
  72