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Add an (untested) implementation of an Intel hex file parser to the EightBit project. Ported directly from the C++ implementation.

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Signed-off-by: Adrian Conlon <adrian.conlon@gmail.com>
This commit is contained in:
Adrian Conlon 2019-04-21 16:53:55 +01:00
parent 0d73b588c3
commit 2a4a067fe4
1 changed files with 77 additions and 2 deletions
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79
EightBit/Bus.cs
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@ -5,6 +5,8 @@
namespace EightBit
{
using System;
using System.Collections.Generic;
using System.IO;
public abstract class Bus : IMapper
{
@ -101,6 +103,69 @@ namespace EightBit
public abstract void Initialize();
protected static Dictionary<ushort, List<byte>> ParseHexFile(string path)
{
var returned = new Dictionary<ushort, List<byte>>();
using (var reader = File.OpenText(path))
{
var eof = false;
while (!reader.EndOfStream && !eof)
{
var line = reader.ReadLine();
var colon = line.Substring(0, 1);
if (colon != ":")
{
throw new System.InvalidOperationException("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:
{
var data = new List<byte>(count);
var requiredLength = 9 + 2 + (count * 2);
if (line.Length != requiredLength)
{
throw new InvalidOperationException("Invalid hex file: line is not the required length");
}
for (var i = 0; i < count; ++i)
{
var position = 9 + (i * 2);
var datumString = line.Substring(position, 2);
var datum = Convert.ToByte(datumString, 16);
data[i] = datum;
}
returned[address] = data;
}
break;
case 0x01:
eof = true;
break;
default:
throw new InvalidOperationException("Unhandled hex file record.");
}
}
}
return returned;
}
protected virtual void OnWritingByte() => this.WritingByte?.Invoke(this, EventArgs.Empty);
protected virtual void OnWrittenByte() => this.WrittenByte?.Invoke(this, EventArgs.Empty);
@ -128,7 +193,17 @@ namespace EightBit
protected ref byte Reference(byte low, byte high) => ref this.Reference(new Register16(low, high).Word);
////[[nodiscard]] static std::map<uint16_t, std::vector<uint8_t>> parseHexFile(std::string path);
////void loadHexFile(std::string path);
protected void LoadHexFile(string path)
{
var chunks = ParseHexFile(path);
foreach (var chunk in chunks)
{
var address = chunk.Key;
var content = chunk.Value;
var mapped = this.Mapping(address);
var offset = address - mapped.Begin;
mapped.Memory.Load(content.ToArray(), offset);
}
}
}
}