69 lines
1.9 KiB
Swift
69 lines
1.9 KiB
Swift
//
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// MemoryInterface.swift
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// FruitMachine
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//
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// Created by Christopher Rohl on 7/20/17.
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// Copyright © 2017 Christopher Rohl. All rights reserved.
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//
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import Cocoa
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class MemoryInterface: NSObject {
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fileprivate var memory: [UInt8]
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var read_overrides: [ReadOverride]
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var write_overrides: [WriteOverride]
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override init() {
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memory = [UInt8](repeating: 0x00, count: 65536)
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read_overrides = [ReadOverride]()
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write_overrides = [WriteOverride]()
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}
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func readByte(offset: UInt16, bypassOverrides: Bool = false) -> UInt8 {
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if(!bypassOverrides) {
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for override in read_overrides {
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if case override.rangeStart ... override.rangeEnd = offset {
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override.action(CPU.sharedInstance, nil)
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}
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}
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}
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//No match.
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return memory[Int(offset)]
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}
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func writeByte(offset: UInt16, value: UInt8, bypassOverrides: Bool = false) {
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if(!bypassOverrides) {
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for override in write_overrides {
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if case override.rangeStart ... override.rangeEnd = offset {
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override.action(CPU.sharedInstance, value)
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if(!override.writeValue) {
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return
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}
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}
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}
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}
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memory[Int(offset)] = value
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}
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func readWord(offset: UInt16) -> UInt16 {
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let low: UInt8 = memory[Int(offset)]
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let high: UInt8 = memory[Int(offset+1)]
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return (UInt16(high) << 8) | UInt16(low)
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}
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func loadBinary(path: String, offset: UInt16) {
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do {
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let fileContent: NSData = try NSData(contentsOfFile: path)
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fileContent.getBytes(&memory[Int(offset)], range: NSRange(location: 0, length: 256))
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} catch {
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print(error)
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}
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}
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}
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