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196 lines
6.6 KiB
C#
196 lines
6.6 KiB
C#
/*
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* Copyright 2019 faddenSoft
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System;
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using System.Collections;
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using System.Collections.Specialized;
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using System.ComponentModel;
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using System.Diagnostics;
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using Asm65;
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namespace SourceGen.Tools {
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/// <summary>
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/// Generates formatted hex dump lines, and makes them available as a list. The result
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/// is suitable for use with WPF ItemsSource. Items are generated on demand, providing
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/// data virtualization.
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/// </summary>
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/// <remarks>
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/// Doing proper data virtualization in WPF is tricky and annoying. We just render on
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/// demand and retain the results indefinitely.
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/// </remarks>
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public class VirtualHexDump : IList, INotifyCollectionChanged, INotifyPropertyChanged {
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/// <summary>
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/// Data to display. We currently require that the entire file fit in memory,
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/// which is reasonable because we impose a 2^24 (16MB) limit.
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/// </summary>
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private byte[] mData;
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/// <summary>
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/// Data formatter object.
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/// </summary>
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private Formatter mFormatter;
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private string[] mLines;
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// Tracks the number of lines we've generated, so we can see if virtualization is
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// actually happening.
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private int mDebugGenLineCount;
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public VirtualHexDump(byte[] data, Formatter formatter) {
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mData = data;
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mFormatter = formatter;
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Count = (mData.Length + 15) / 16;
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mLines = new string[Count];
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mDebugGenLineCount = 0;
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}
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/// <summary>
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/// Causes all lines to be reformatted. Call this after changing the desired format.
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/// Generates a collection-reset event, which may cause loss of selection.
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/// </summary>
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public void Reformat(Formatter newFormat) {
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mFormatter = newFormat;
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for (int i = 0; i < mLines.Length; i++) {
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mLines[i] = null;
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}
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OnPropertyChanged(CountString);
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OnPropertyChanged(IndexerName);
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OnCollectionReset();
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}
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/// <summary>
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/// Returns the Nth line, generating it if it hasn't been yet.
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/// </summary>
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private string GetLine(int index) {
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if (mLines[index] == null) {
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mLines[index] = mFormatter.FormatHexDump(mData, index * 16);
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if ((++mDebugGenLineCount % 1000) == 0) {
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//Debug.WriteLine("DebugGenLineCount: " + mDebugGenLineCount);
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}
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}
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//Debug.WriteLine("GET LINE " + index + ": " + mLines[index]);
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return mLines[index];
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}
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#region Property / Collection Changed
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public event NotifyCollectionChangedEventHandler CollectionChanged;
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public event PropertyChangedEventHandler PropertyChanged;
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private const string CountString = "Count";
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private const string IndexerName = "Item[]";
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protected virtual void OnPropertyChanged(PropertyChangedEventArgs e) {
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PropertyChanged?.Invoke(this, e);
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}
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private void OnPropertyChanged(string propertyName) {
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OnPropertyChanged(new PropertyChangedEventArgs(propertyName));
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}
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protected virtual void OnCollectionChanged(NotifyCollectionChangedEventArgs e) {
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CollectionChanged?.Invoke(this, e);
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}
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private void OnCollectionReset() {
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OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
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}
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#endregion Property / Collection Changed
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#region IList
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public bool IsReadOnly => true;
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public bool IsFixedSize => true;
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public int Count { get; private set; }
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public object SyncRoot => throw new NotImplementedException();
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public bool IsSynchronized => false;
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public object this[int index] {
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get => GetLine(index);
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set => throw new NotImplementedException();
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}
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public int Add(object value) {
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throw new NotImplementedException();
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}
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public bool Contains(object value) {
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return (IndexOf(value) >= 0);
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}
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public void Clear() {
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throw new NotImplementedException();
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}
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public int IndexOf(object value) {
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//Debug.WriteLine("VHD IndexOf " + value);
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// This gets called sometimes when the selection changes, because the selection
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// mechanism tracks objects rather than indices. Fortunately we can convert the
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// value string to an index by parsing the first six characters. (This is
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// somewhat fragile as it relies on the way Formatter formats the string. Might
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// want to make offset-from-hexdump-string a Formatter method.)
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int offset = Convert.ToInt32(((string)value).Substring(0, 6), 16);
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int index = offset / 16;
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// Either the object at the target location matches, or it doesn't; no need to
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// search. We'll get requests for nonexistent objects after we reformat the
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// collection, when the list control tries to find the selected items.
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//
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// Object equality is what's desired; no need for string comparison
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if ((object)mLines[index] == value) {
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return index;
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}
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//Debug.WriteLine(" IndexOf not found");
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return -1;
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}
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public void Insert(int index, object value) {
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throw new NotImplementedException();
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}
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public void Remove(object value) {
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throw new NotImplementedException();
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}
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public void RemoveAt(int index) {
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throw new NotImplementedException();
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}
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public void CopyTo(Array array, int index) {
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throw new NotImplementedException();
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}
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public IEnumerator GetEnumerator() {
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// Use the indexer, rather than mLines's enumerator, to get on-demand string gen.
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for (int i = 0; i < mLines.Length; i++) {
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yield return this[i];
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}
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}
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#endregion IList
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}
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}
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