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memory.cpp
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memory.cpp
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// =========================================================================
// Copyright (C) 2009-2024 by Anders Piniesjö <[email protected]>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>
// =========================================================================
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <sstream>
#include <iomanip>
#include <string.h>
#include <algorithm>
#include "memory.hpp"
#include "snapshot.hpp"
#include "chip/mos6502.hpp"
Memory::Memory(uint32_t size) :
mem(NULL),
size(size),
mempos(0),
memory(size)
{
mem = memory.data();
std::fill(memory.begin(), memory.end(), 0x00);
}
Memory::~Memory()
{
}
void error_exit(std::string description)
{
std::cout << std::endl << "!!! Error: " << description << std::endl << std::endl;
exit(1);
}
void Memory::load(const std::string& path, uint32_t address)
{
std::cout << "Memory: loading " << path << " -> $" << std::hex << address << std::endl;
// stat to check existance and size
struct stat file_info;
if (stat(path.c_str(), &file_info)) {
error_exit("no such file: " + path);
}
int file_size = file_info.st_size;
int fd = open(path.c_str(), O_RDONLY);
if (fd < 0) {
error_exit("could not open file: " + path);
}
ssize_t count = 0;
int pos = address;
uint8_t* buff = (uint8_t*)malloc(1);
while (file_size - count > 0) {
ssize_t result = read(fd, buff, 1);
if (result == 0) {
break;
}
if (result == -1) {
error_exit("error reading file: " + path);
}
mem[pos] = *buff;
pos += result;
count += result;
}
free(buff);
return;
}
void Memory::save_to_snapshot(Snapshot& snapshot)
{
snapshot.memory = memory;
}
void Memory::load_from_snapshot(Snapshot& snapshot)
{
memory = snapshot.memory;
}
void Memory::show(uint32_t pos, uint32_t length)
{
std::cout << "Showing 0x" << length << " bytes from " << std::hex << pos << std::endl;
std::ostringstream chars;
for (uint32_t i=0; i < length; i++) {
if ((i % 16) == 0) {
std::cout << " " << chars.str() << std::endl << "[" << pos + i << "] " << std::hex;
chars.str("");
}
std::cout << std::setw(2) << std::setfill('0') << (unsigned int)mem[pos + i] << " ";
if ((mem[pos + i] & 0x7f) >= 32) {
chars << (char)(mem[pos + i] & 0x7f) << " ";
}
else {
chars << " ";
}
}
std::cout << std::endl;
}