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bin.cpp
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bin.cpp
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/**
* bin.cpp
*
* (c) Copyright 2010, P. Jakubco
*
* This module handles the loading of textual binary representation of RAM
* program.
*
*/
#include <iostream>
#include <fstream>
#include "bin.hpp"
using namespace std;
RAMBin::RAMBin() {
this->ram_size = -1;
this->program = NULL;
}
RAMBin::~RAMBin() {
if (this->program != NULL)
delete [] this->program;
this->ram_size = -1;
}
/**
* This function loads a file with RAM program in memory.
*
* @param filename - file name
* @return address of the loaded buffer
*/
bool RAMBin::bin_load(const char *filename) {
ifstream fin(filename, ios::binary);
int size;
if (!fin.is_open()) {
cout << "Error: can't open file name '" << filename
<< "'." << endl;
return false;
}
/* get the file size (resulting binary should be less than this) */
fin.seekg(0, std::ios_base::beg);
std::ifstream::pos_type begin_pos = fin.tellg();
fin.seekg(0, std::ios_base::end);
size = static_cast<int>(fin.tellg() - begin_pos);
fin.seekg(0,ios_base::beg);
// cout << "RAM program size: " << size +1 << endl;
if (this->program != NULL)
delete [] this->program;
this->program = new unsigned char[size + 1];
if (this->program == NULL) {
// fin.close();
cout << "Error: can't allocate memory for the program." << endl;
return false;
}
ram_size = this->bin_parse(&fin, size + 1);
//fin.close(); // CAUSING BUG..
if (ram_size <= 0) {
delete [] this->program;
cout << "Error: can't parse the file." << endl;
return false;
}
return true;
}
/**
* This function parses the file and convert it to binary file into the
* buffer. Each RAM instruction is 1 byte long.
*
* @param fin - opened input file
* @param max_size - maximal loadable size
* @return -1 if the parsing failed, positive value (binary size) if it is OK.
*/
int RAMBin::bin_parse(ifstream *fin, const int max_size) {
if (this->program == NULL)
return 0;
if (!fin->is_open())
return 0;
//fin.unsetf(ios_base::skipws);
int p = 0;
int t;
while (!fin->eof()) {
if (p == max_size - 1) {
cout << "Warning: Ignoring some input." << endl;
break;
}
*fin >> t;
this->program[p++] = t&0xFF; //(unsigned char) (t & 0xFF);
}
this->program[p-1] = 0;
return p;
}
/**
* This function shows binary representation of RAM program in mnemo-code.
* The correct syntax is assumed.
*/
void RAMBin::bin_print() {
if (this->program == NULL)
return;
int p = 0;
int c;
if (ram_size < 0) {
cout << "Error: RAM program was not loaded properly." << endl;
return;
}
do {
c = this->program[p++];
cout << p-1 << ": ";
switch (c) {
case 0: cout << "\tHALT" << endl;
break;
case 1: cout << "\tREAD "
<< (unsigned int) this->program[p++] << endl;
break;
case 2: cout << "\tREAD *"
<< (unsigned int) this->program[p++] << endl;
break;
case 3: cout << "\tWRITE ="
<< (unsigned int) this->program[p++] << endl;
break;
case 4: cout << "\tWRITE "
<< (unsigned int) this->program[p++] << endl;
break;
case 5: cout << "\tWRITE *"
<< (unsigned int) this->program[p++] << endl;
break;
case 6: cout << "\tLOAD ="
<< (unsigned int) this->program[p++] << endl;
break;
case 7: cout << "\tLOAD "
<< (unsigned int) this->program[p++] << endl;
break;
case 8: cout << "\tLOAD *"
<< (unsigned int) this->program[p++] << endl;
break;
case 9: cout << "\tSTORE "
<< (unsigned int) this->program[p++] << endl;
break;
case 10: cout << "\tSTORE *"
<< (unsigned int) this->program[p++] << endl;
break;
case 11: cout << "\tADD ="
<< (unsigned int) this->program[p++] << endl;
break;
case 12: cout << "\tADD "
<< (unsigned int) this->program[p++] << endl;
break;
case 13: cout << "\tADD *"
<< (unsigned int) this->program[p++] << endl;
break;
case 14: cout << "\tSUB ="
<< (unsigned int) this->program[p++] << endl;
break;
case 15: cout << "\tSUB "
<< (unsigned int) this->program[p++] << endl;
break;
case 16: cout << "\tSUB *"
<< (unsigned int) this->program[p++] << endl;
break;
case 17: cout << "\tMUL ="
<< (unsigned int) this->program[p++] << endl;
break;
case 18: cout << "\tMUL "
<< (unsigned int) this->program[p++] << endl;
break;
case 19: cout << "\tMUL *"
<< (unsigned int) this->program[p++] << endl;
break;
case 20: cout << "\tDIV ="
<< (unsigned int) this->program[p++] << endl;
break;
case 21: cout << "\tDIV "
<< (unsigned int) this->program[p++] << endl;
break;
case 22: cout << "\tDIV *"
<< (unsigned int) this->program[p++] << endl;
break;
case 23: cout << "\tJMP "
<< (unsigned int) this->program[p++] << endl;
break;
case 24: cout << "\tJGTZ "
<< (unsigned int) this->program[p++] << endl;
break;
case 25: cout << "\tJZ "
<< (unsigned int) this->program[p++] << endl;
break;
default:
cout << "\t>> UNKNOWN INSTRUCTION <<" << endl;
break;
}
} while (p < this->ram_size);
}
const char *RAMBin::load_file(const char *filename) {
ifstream fin(filename, ios::binary);
int size;
if (!fin.is_open()) {
cout << "Error: can't open file name '" << filename
<< "'." << endl;
return false;
}
// fin.unsetf(ios_base::skipws);
/* get the file size (resulting binary should be less than this) */
fin.seekg(0, std::ios_base::beg);
std::ifstream::pos_type begin_pos = fin.tellg();
fin.seekg(0, std::ios_base::end);
size = static_cast<int>(fin.tellg() - begin_pos);
fin.seekg(0,ios_base::beg);
char *file = new char[size+1];
if (file == NULL) {
fin.close();
cout << "Error: can't allocate memory for the file." << endl;
return false;
}
int p = 0;
char t;
while (!fin.eof()) {
t = fin.get();
file[p++] = t&0xff; //(char)(t & 0xFF);
}
file[p-1] = 0;
fin.close();
return file;
}