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 /*!
  13  *\brief Specialisation constructor.
  14  */
  15 data_block::data_block(tape_block& org)
  16   :tape_block(org)
  17 {
  18   m_has_known_type=false;
  19 }
  20
  21 /***************************************************************/
  22 /*!
  23  *\brief Determine block type.
  24  *\return the block type extracted from the block's data.
  25  */
  26 int data_block::get_type(){
  27      return (word_data[0]&0xf000)>>12;
  28 }
  29
  30 /***************************************************************/
  31 /*!
  32  *\brief Get the block's size in 16 bit words.
  33  *\return The block's 16-bit data buffer's size including
  34  *         header and checksum.
  35  */
  36 int data_block::get_word_size(){
  37   return word_size;
  38 }
  39
  40 /***************************************************************/
  41 /*!
  42  *\brief Describe the block.
  43  *\return A vector of text lines describing this block.
  44  */
  45 vector<string> data_block::get_description(){
  46   vector<string> result;
  47   string r_string="*****      "+get_typestring()+"Untyped data block, this \
  48  is an illegal condition!";
  49   result.insert(result.end(),r_string);
  50   return result;
  51 }
  52
  53 /***************************************************************/
  54 /*!
  55  *\brief Extract 6 byte symbol name from word memory.
  56  *
  57  *\param  firstbyte the first byte of the desired symbol name
  58  *\return a string containing the symbol name.
  59  *        Trailing spaces are included.
  60  *\note The word_data is handled system-intependently big endian!
  61  */
  62 string data_block::extract_label(int firstbyte){
  63   string result="";  // Start with empty string
  64
  65   // We don't accept negative arguments!
  66   if (firstbyte<0) return result;
  67
  68   // We also don't want segmentation faults!
  69   if (word_size<(firstbyte/2+1)) return result;
  70
  71   // Here we pick out the characters.
  72   for (int posi=firstbyte;posi<firstbyte+6;posi++)
  73     result+=(word_data[posi/2]>>(8*(1-posi%2)))&0x7f;
  74   return result;
  75 }
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