*** empty log message ***

[h316.git] / pc-tools / ldc2 / src / data_block.cpp

/******************************************************************************
 * 
 * LDC2 source code
 *
 * $Date: 2007/03/26 01:00:38 $
 * $Author: hachti $
 *
 * $Log: data_block.cpp,v $
 * Revision 2.0  2007/03/26 01:00:38  hachti
 * *** empty log message ***
 *
 *
 ******************************************************************************/
 
#include <stdlib.h>
#include <string.h>

#include "data_block.hh"
#include "data_block_0.hh"

#include <stdio.h>

using namespace std;

/***************************************************************/
/*!
 *\brief Specialisation constructor.
 */
data_block::data_block(tape_block& org)
  :tape_block(org)
{
  m_has_known_type=false;
}

/***************************************************************/
/*!
 *\brief Determine block type.
 *\return the block type extracted from the block's data.
 */
int data_block::get_type(){
     return (word_data[0]&0xf000)>>12;
}

/***************************************************************/
/*!
 *\brief Get the block's size in 16 bit words.
 *\return The block's 16-bit data buffer's size including
 *         header and checksum.
 */
int data_block::get_word_size(){
  return word_size;
}

/***************************************************************/
/*!
 *\brief Describe the block.
 *\return A vector of text lines describing this block.
 */
vector<string> data_block::get_description(){
  vector<string> result;
  string r_string="*****      "+get_typestring()+"Untyped data block, this \
 is an illegal condition!";
  result.insert(result.end(),r_string);
  return result;
}

/***************************************************************/
/*!
 *\brief Extract 6 byte symbol name from word memory.
 *
 *\param  firstbyte the first byte of the desired symbol name
 *\return a string containing the symbol name. 
 *        Trailing spaces are included.
 *\note The word_data is handled system-intependently big endian!
 */
string data_block::extract_label(int firstbyte){
  string result="";  // Start with empty string
  
  // We don't accept negative arguments!
  if (firstbyte<0) return result; 
  
  // We also don't want segmentation faults!
  if (word_size<(firstbyte/2+1)) return result; 
 
  // Here we pick out the characters.
  for (int posi=firstbyte;posi<firstbyte+6;posi++)
    result+=(word_data[posi/2]>>(8*(1-posi%2)))&0x7f;
  return result;
}