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

#include <stdlib.h>
#include <string.h>

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

#include <stdio.h>

using namespace std;

data_block::data_block(tape_block& idol)
  :tape_block(idol)
{
}

data_block::~data_block(){
}

int data_block::get_type(){
  if ((init_state==TBS_OK)&&word_data)
    return (word_data[0]&0xf000)>>12;
  else
 return block_type;
}

int data_block::get_subtype(){
  if (get_type()==0)
    return (new data_block_0(*this))->get_subtype();
  else return 0;
}

/*!
 *\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 Extract 6 byte symbol name from word memory.
 *
 *\param  startbyte 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_string(int startbyte){
  string result="";  // Start with empty string
  
  // We don't accept negative arguments!
  if (startbyte<0) return result; 
  
  // We also don't want segmentation faults!
  if (word_size<(startbyte/2+1)) return result; 
 
  // Here we pick out the characters.
  for (int posi=startbyte;posi<startbyte+6;posi++)
    result+=(word_data[posi/2]>>(8*(1-posi%2)))&0x7f;
  return result;
}