2012-05-03 20:34:58 +08:00
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/*
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Copyright (C) 2011-2012 de4dot@gmail.com
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This file is part of de4dot.
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de4dot 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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de4dot 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 de4dot. 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.IO;
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using System.Text;
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using System.Text.RegularExpressions;
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using Mono.Cecil;
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namespace de4dot.code.resources {
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[Serializable]
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class ResourceReaderException : Exception {
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public ResourceReaderException(string msg)
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: base(msg) {
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}
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}
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class ResourceReader {
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ModuleDefinition module;
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BinaryReader reader;
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ResourceDataCreator resourceDataCreator;
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ResourceReader(ModuleDefinition module, Stream stream) {
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this.module = module;
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this.reader = new BinaryReader(stream);
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this.resourceDataCreator = new ResourceDataCreator(module);
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}
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public static ResourceElementSet read(ModuleDefinition module, Stream stream) {
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return new ResourceReader(module, stream).read();
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}
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ResourceElementSet read() {
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ResourceElementSet resources = new ResourceElementSet();
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uint sig = reader.ReadUInt32();
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if (sig != 0xBEEFCACE)
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throw new ResourceReaderException(string.Format("Invalid resource sig: {0:X8}", sig));
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if (!checkReaders())
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throw new ResourceReaderException("Invalid resource reader");
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int version = reader.ReadInt32();
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if (version != 2)
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throw new ResourceReaderException(string.Format("Invalid resource version: {0}", version));
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int numResources = reader.ReadInt32();
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if (numResources < 0)
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throw new ResourceReaderException(string.Format("Invalid number of resources: {0}", numResources));
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int numUserTypes = reader.ReadInt32();
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if (numUserTypes < 0)
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throw new ResourceReaderException(string.Format("Invalid number of user types: {0}", numUserTypes));
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var userTypes = new List<UserResourceType>();
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for (int i = 0; i < numUserTypes; i++)
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userTypes.Add(new UserResourceType(reader.ReadString(), ResourceTypeCode.UserTypes + i));
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reader.BaseStream.Position = (reader.BaseStream.Position + 7) & ~7;
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var hashes = new int[numResources];
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for (int i = 0; i < numResources; i++)
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hashes[i] = reader.ReadInt32();
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var offsets = new int[numResources];
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for (int i = 0; i < numResources; i++)
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offsets[i] = reader.ReadInt32();
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long baseOffset = reader.BaseStream.Position;
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long dataBaseOffset = reader.ReadInt32();
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long nameBaseOffset = reader.BaseStream.Position;
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long end = reader.BaseStream.Length;
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var infos = new List<ResourceInfo>(numResources);
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var nameReader = new BinaryReader(reader.BaseStream, Encoding.Unicode);
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for (int i = 0; i < numResources; i++) {
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nameReader.BaseStream.Position = nameBaseOffset + offsets[i];
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var name = nameReader.ReadString();
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long offset = dataBaseOffset + nameReader.ReadInt32();
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infos.Add(new ResourceInfo(name, offset));
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}
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infos.Sort(sortResourceInfo);
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for (int i = 0; i < infos.Count; i++) {
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var info = infos[i];
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var element = new ResourceElement();
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element.Name = info.name;
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reader.BaseStream.Position = info.offset;
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long nextDataOffset = i == infos.Count - 1 ? end : infos[i + 1].offset;
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int size = (int)(nextDataOffset - info.offset);
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element.ResourceData = readResourceData(userTypes, size);
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resources.add(element);
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}
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return resources;
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}
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static int sortResourceInfo(ResourceInfo a, ResourceInfo b) {
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return Utils.compareInt32((int)a.offset, (int)b.offset);
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}
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class ResourceInfo {
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public string name;
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public long offset;
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public ResourceInfo(string name, long offset) {
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this.name = name;
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this.offset = offset;
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}
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public override string ToString() {
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return string.Format("{0:X8} - {1}", offset, name);
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}
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}
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IResourceData readResourceData(List<UserResourceType> userTypes, int size) {
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uint code = readUInt32(reader);
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switch ((ResourceTypeCode)code) {
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case ResourceTypeCode.Null: return resourceDataCreator.createNull();
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case ResourceTypeCode.String: return resourceDataCreator.create(reader.ReadString());
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case ResourceTypeCode.Boolean: return resourceDataCreator.create(reader.ReadBoolean());
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case ResourceTypeCode.Char: return resourceDataCreator.create((char)reader.ReadUInt16());
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case ResourceTypeCode.Byte: return resourceDataCreator.create(reader.ReadByte());
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case ResourceTypeCode.SByte: return resourceDataCreator.create(reader.ReadSByte());
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case ResourceTypeCode.Int16: return resourceDataCreator.create(reader.ReadInt16());
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case ResourceTypeCode.UInt16: return resourceDataCreator.create(reader.ReadUInt16());
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case ResourceTypeCode.Int32: return resourceDataCreator.create(reader.ReadInt32());
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case ResourceTypeCode.UInt32: return resourceDataCreator.create(reader.ReadUInt32());
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case ResourceTypeCode.Int64: return resourceDataCreator.create(reader.ReadInt64());
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case ResourceTypeCode.UInt64: return resourceDataCreator.create(reader.ReadUInt64());
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case ResourceTypeCode.Single: return resourceDataCreator.create(reader.ReadSingle());
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case ResourceTypeCode.Double: return resourceDataCreator.create(reader.ReadDouble());
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case ResourceTypeCode.Decimal: return resourceDataCreator.create(reader.ReadDecimal());
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case ResourceTypeCode.DateTime: return resourceDataCreator.create(new DateTime(reader.ReadInt64()));
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case ResourceTypeCode.TimeSpan: return resourceDataCreator.create(new TimeSpan(reader.ReadInt64()));
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case ResourceTypeCode.ByteArray: return resourceDataCreator.create(reader.ReadBytes(reader.ReadInt32()));
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default:
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int userTypeIndex = (int)(code - (uint)ResourceTypeCode.UserTypes);
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if (userTypeIndex < 0 || userTypeIndex >= userTypes.Count)
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throw new ResourceReaderException(string.Format("Invalid resource data code: {0}", code));
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return resourceDataCreator.createSerialized(reader.ReadBytes(size));
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}
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}
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static uint readUInt32(BinaryReader reader) {
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2012-06-03 22:07:05 +08:00
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try {
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return Utils.readEncodedUInt32(reader);
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}
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catch {
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throw new ResourceReaderException("Invalid encoded int32");
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2012-05-03 20:34:58 +08:00
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}
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}
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bool checkReaders() {
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bool validReader = false;
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int numReaders = reader.ReadInt32();
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if (numReaders < 0)
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throw new ResourceReaderException(string.Format("Invalid number of readers: {0}", numReaders));
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int readersSize = reader.ReadInt32();
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if (readersSize < 0)
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throw new ResourceReaderException(string.Format("Invalid readers size: {0:X8}", readersSize));
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for (int i = 0; i < numReaders; i++) {
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var resourceReaderFullName = reader.ReadString();
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var resourceSetFullName = reader.ReadString();
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if (Regex.IsMatch(resourceReaderFullName, @"^System\.Resources\.ResourceReader,\s*mscorlib,"))
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validReader = true;
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}
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return validReader;
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}
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}
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}
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