//
// Copyright (c) Adrian Conlon. All rights reserved.
//
namespace EightBit
{
using System;
using System.Collections.Generic;
using System.IO;
public class IntelHexFile : IDisposable
{
private readonly StreamReader reader;
private bool eof;
private bool disposed = false;
public IntelHexFile(string path) => this.reader = File.OpenText(path);
public void Dispose()
{
this.Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if (!this.disposed)
{
if (disposing)
{
this.reader.Dispose();
}
this.disposed = true;
}
}
public IEnumerable> Parse()
{
this.eof = false;
while (!this.reader.EndOfStream && !this.eof)
{
var line = this.reader.ReadLine();
var parsed = this.Parse(line);
if (parsed != null)
{
yield return parsed;
}
}
if (!this.eof)
{
throw new InvalidOperationException("File is missing an EOF record");
}
}
private Tuple Parse(string line)
{
if (string.IsNullOrEmpty(line))
{
throw new ArgumentNullException(nameof(line));
}
var colon = line.Substring(0, 1);
if (colon != ":")
{
throw new ArgumentOutOfRangeException(nameof(line), "Invalid hex file: line does not begin with a colon");
}
var countString = line.Substring(1, 2);
var count = Convert.ToByte(countString, 16);
var addressString = line.Substring(3, 4);
var address = Convert.ToUInt16(addressString, 16);
var recordTypeString = line.Substring(7, 2);
var recordType = Convert.ToByte(recordTypeString, 16);
switch (recordType)
{
case 0x00:
return ParseDataRecord(line, address, count);
case 0x01:
this.eof = true;
return null;
default:
throw new InvalidOperationException("Unhandled hex file record.");
}
}
private static Tuple ParseDataRecord(string line, ushort address, byte count)
{
if (string.IsNullOrEmpty(line))
{
throw new ArgumentNullException(nameof(line));
}
var requiredLength = 9 + 2 + (count * 2);
if (line.Length != requiredLength)
{
throw new ArgumentOutOfRangeException(nameof(line), "Invalid hex file: line is not the required length");
}
var data = new byte[count];
for (var i = 0; i < count; ++i)
{
var position = 9 + (i * 2);
var extracted = line.Substring(position, 2);
data[i] = Convert.ToByte(extracted, 16);
}
return new Tuple(address, data);
}
}
}