FruitMachine-Swift/FruitMachine/M6502/Memory/MemoryInterface.swift
2017-07-26 00:44:53 -04:00

60 lines
1.6 KiB
Swift

//
// MemoryInterface.swift
// FruitMachine
//
// Created by Christopher Rohl on 7/20/17.
// Copyright © 2017 Christopher Rohl. All rights reserved.
//
import Cocoa
class MemoryInterface: NSObject {
fileprivate var memory: [UInt8]
var read_overrides: [ReadOverride]
var write_overrides: [WriteOverride]
override init() {
memory = [UInt8](repeating: 0x00, count: 65536)
read_overrides = [ReadOverride]()
write_overrides = [WriteOverride]()
}
func readByte(offset: UInt16) -> UInt8 {
for override in read_overrides {
if case override.rangeStart ... override.rangeEnd = offset {
override.action(CPU.sharedInstance, nil)
}
}
//No match.
return memory[Int(offset)]
}
func writeByte(offset: UInt16, value: UInt8) {
for override in read_overrides {
if case override.rangeStart ... override.rangeEnd = offset {
override.action(CPU.sharedInstance, value)
}
}
memory[Int(offset)] = value
}
func readWord(offset: UInt16) -> UInt16 {
let low: UInt8 = memory[Int(offset)]
let high: UInt8 = memory[Int(offset+1)]
return (UInt16(high) << 8) | UInt16(low)
}
func loadBinary(path: String) {
do {
let fileContent: NSData = try NSData(contentsOfFile: path)
fileContent.getBytes(&memory, range: NSRange(location: 0, length: 65536))
} catch {
print(error)
}
}
}