118 lines
3.3 KiB
C#
118 lines
3.3 KiB
C#
/*
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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.ComponentModel.Composition;
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using System.IO;
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using System.Runtime.InteropServices;
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using dnlib.DotNet;
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using dnlib.IO;
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namespace dnSpy.AsmEditor.Compiler {
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abstract class RawModuleBytesProvider {
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public abstract RawModuleBytes? GetRawModuleBytes(ModuleDef module);
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}
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[Export(typeof(RawModuleBytesProvider))]
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sealed unsafe class RawModuleBytesProviderImpl : RawModuleBytesProvider {
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readonly byte[] buffer;
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[ImportingConstructor]
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RawModuleBytesProviderImpl() => buffer = new byte[0x2000];
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public override RawModuleBytes? GetRawModuleBytes(ModuleDef module) {
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// Try to use the latest changes the user has saved to disk.
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// Try the file, if it still exists
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var rawData = TryReadFile(module.Location);
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if (rawData is not null)
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return rawData;
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// If there's no file, use the in-memory data
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if (module is ModuleDefMD m)
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return TryReadModule(m);
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return null;
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}
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RawModuleBytes? TryReadFile(string filename) {
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if (File.Exists(filename)) {
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try {
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using (var stream = File.OpenRead(filename))
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return TryReadStream(stream, isFileLayout: true);
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}
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catch {
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}
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}
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return null;
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}
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RawModuleBytes? TryReadStream(Stream stream, bool isFileLayout) {
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RawModuleBytes? rawModuleBytes = null;
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bool error = true;
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try {
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if (stream.Length > int.MaxValue)
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return null;
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rawModuleBytes = new NativeMemoryRawModuleBytes((int)stream.Length, isFileLayout);
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var p = (byte*)rawModuleBytes.Pointer;
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for (;;) {
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int bytesLeft = (int)(stream.Length - stream.Position);
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if (bytesLeft == 0) {
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error = false;
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return rawModuleBytes;
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}
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if (bytesLeft > buffer.Length)
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bytesLeft = buffer.Length;
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int readBytes = stream.Read(buffer, 0, bytesLeft);
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if (readBytes == 0)
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return default;
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Marshal.Copy(buffer, 0, (IntPtr)p, readBytes);
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p += readBytes;
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}
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}
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finally {
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if (error)
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rawModuleBytes?.Dispose();
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}
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}
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RawModuleBytes? TryReadModule(ModuleDefMD module) {
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var reader = module.Metadata.PEImage.CreateReader();
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return TryReadStream(ref reader, module.Metadata.PEImage.IsFileImageLayout);
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}
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RawModuleBytes? TryReadStream(ref DataReader reader, bool isFileLayout) {
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RawModuleBytes? rawModuleBytes = null;
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bool error = true;
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try {
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if (reader.Length > int.MaxValue)
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return null;
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rawModuleBytes = new NativeMemoryRawModuleBytes((int)reader.Length, isFileLayout);
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reader.ReadBytes(rawModuleBytes.Pointer, rawModuleBytes.Size);
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error = false;
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return rawModuleBytes;
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}
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finally {
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if (error)
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rawModuleBytes?.Dispose();
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}
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}
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}
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}
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