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6502bench/SourceGen/Examples/Tutorial/InlineNullTermString.cs

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// Copyright 2019 faddenSoft. All Rights Reserved.
// See the LICENSE.txt file for distribution terms (Apache 2.0).
using System;
using System.Collections.Generic;
using PluginCommon;
namespace ExtensionScriptSample {
/// <summary>
/// Sample class for handling a JSR followed by an inline null-terminated string. Any
/// label that starts with "PrintLineNullString" is matched.
/// </summary>
public class InlineNullTermString : MarshalByRefObject, IPlugin, IPlugin_SymbolList,
IPlugin_InlineJsr {
private IApplication mAppRef;
private byte[] mFileData;
private const string LABEL_PREFIX = "PrintInlineNullString";
private Dictionary<int, PlSymbol> mNullStringAddrs = new Dictionary<int, PlSymbol>();
public string Identifier {
get {
return "Inline null-terminated ASCII string handler";
}
}
public void Prepare(IApplication appRef, byte[] fileData, AddressTranslate addrTrans) {
mAppRef = appRef;
mFileData = fileData;
mAppRef.DebugLog("InlineNullStringHandler(id=" +
AppDomain.CurrentDomain.Id + "): prepare()");
}
public void Unprepare() {
mAppRef = null;
mFileData = null;
}
public void UpdateSymbolList(List<PlSymbol> plSyms) {
mNullStringAddrs.Clear();
foreach (PlSymbol sym in plSyms) {
if (sym.Label.StartsWith(LABEL_PREFIX)) {
mNullStringAddrs.Add(sym.Value, sym);
}
}
mAppRef.DebugLog(LABEL_PREFIX + " matched " + mNullStringAddrs.Count + " labels");
}
public bool IsLabelSignificant(string beforeLabel, string afterLabel) {
return beforeLabel.StartsWith(LABEL_PREFIX) || afterLabel.StartsWith(LABEL_PREFIX);
}
public void CheckJsr(int offset, int operand, out bool noContinue) {
noContinue = false;
if (!mNullStringAddrs.ContainsKey(operand)) {
return;
}
// search for the terminating null byte
int nullOff = offset + 3;
while (nullOff < mFileData.Length) {
if (mFileData[nullOff] == 0) {
break;
}
nullOff++;
}
if (nullOff == mFileData.Length) {
mAppRef.DebugLog("Unable to find end of null-terminated string at +" +
(offset+3).ToString("x6"));
return;
}
// Assuming ASCII. This can be hard-coded, use auto-detection, or look
// up a value in a project constant.
mAppRef.SetInlineDataFormat(offset + 3, nullOff - (offset + 3) + 1,
DataType.StringNullTerm, DataSubType.Ascii, null);
}
}
}