80 lines
2.6 KiB
C#
80 lines
2.6 KiB
C#
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/*
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Copyright (C) 2014-2019 de4dot@gmail.com
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This file is part of dnSpy
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dnSpy is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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dnSpy is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with dnSpy. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Text;
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using dnlib.DotNet;
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using dnlib.DotNet.MD;
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namespace dnSpy.AsmEditor.Compiler.MDEditor {
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sealed class StringsMDHeap : MDHeap {
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readonly MetadataEditor mdEditor;
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readonly StringsStream stringsStream;
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uint currentOffset;
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readonly List<byte[]> newData;
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static readonly byte[] nulByte = new byte[1];
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public string Name => stringsStream.Name;
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public bool IsBig => currentOffset > 0xFFFF;
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internal StringsStream StringsStream => stringsStream;
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internal List<byte[]> NewData => newData;
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public StringsMDHeap(MetadataEditor mdEditor, StringsStream stringsStream) {
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this.mdEditor = mdEditor ?? throw new ArgumentNullException(nameof(mdEditor));
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this.stringsStream = stringsStream ?? throw new ArgumentNullException(nameof(stringsStream));
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currentOffset = stringsStream.StreamLength;
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newData = new List<byte[]>();
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}
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public uint Create(string name) => Create(string.IsNullOrEmpty(name) ? Array.Empty<byte>() : Encoding.UTF8.GetBytes(name));
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public uint Create(UTF8String name) => Create(UTF8String.IsNullOrEmpty(name) ? Array.Empty<byte>() : name.Data);
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uint Create(byte[] data) {
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if (currentOffset == 0) {
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newData.Add(new byte[1]);
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currentOffset++;
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}
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if (data is null || data.Length == 0)
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return 0;
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CheckValidName(data);
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newData.Add(data);
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newData.Add(nulByte);
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Debug.Assert(nulByte.Length == 1);
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var res = currentOffset;
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currentOffset += (uint)data.Length + 1;
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return res;
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}
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[Conditional("DEBUG")]
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static void CheckValidName(byte[] bytes) {
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for (int i = 0; i < bytes.Length; i++) {
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if (bytes[i] == 0) {
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Debug.Fail("Invalid #Strings name. It must not contain a NUL char");
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return;
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}
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}
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}
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public override bool MustRewriteHeap() => newData.Count > 0;
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public override bool ExistsInMetadata => stringsStream.StreamHeader is not null;
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}
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}
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