85 lines
2.4 KiB
C#
85 lines
2.4 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 dnlib.DotNet.MD;
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namespace dnSpy.AsmEditor.Compiler.MDEditor {
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sealed class BlobMDHeap : MDHeap {
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readonly MetadataEditor mdEditor;
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readonly BlobStream blobStream;
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uint currentOffset;
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readonly List<byte[]> newData;
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public string Name => blobStream.Name;
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public bool IsBig => currentOffset > 0xFFFF;
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internal BlobStream BlobStream => blobStream;
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internal List<byte[]> NewData => newData;
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public BlobMDHeap(MetadataEditor mdEditor, BlobStream blobStream) {
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this.mdEditor = mdEditor ?? throw new ArgumentNullException(nameof(mdEditor));
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this.blobStream = blobStream ?? throw new ArgumentNullException(nameof(blobStream));
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currentOffset = blobStream.StreamLength;
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newData = new List<byte[]>();
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}
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public 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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var lengthBytes = GetLengthBytes((uint)data.Length);
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newData.Add(lengthBytes);
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newData.Add(data);
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var res = currentOffset;
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currentOffset += (uint)(lengthBytes.Length + data.Length);
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return res;
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}
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byte[] GetLengthBytes(uint value) {
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if (value <= 0x7F)
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return new byte[1] { (byte)value };
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if (value <= 0x3FFF) {
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return new byte[2] {
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(byte)((value >> 8) | 0x80),
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(byte)value,
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};
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}
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if (value <= 0x1FFFFFFF) {
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return new byte[4] {
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(byte)((value >> 24) | 0xC0),
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(byte)(value >> 16),
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(byte)(value >> 8),
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(byte)value,
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};
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}
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throw new ArgumentOutOfRangeException(nameof(value));
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}
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public override bool MustRewriteHeap() => newData.Count > 0;
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public override bool ExistsInMetadata => blobStream.StreamHeader is not null;
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}
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}
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