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MyResourceReader.cs
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MyResourceReader.cs
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using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Text;
// Very big thanks to ILspy here.
//
namespace DLLdotNetResourceReader
{
internal class MyResourceReader : IEnumerable<KeyValuePair<string, object>>, IDisposable
{
sealed class MyBinaryReader : BinaryReader
{
public MyBinaryReader(Stream input, bool leaveOpen) : base(input, Encoding.UTF8, leaveOpen)
{
}
// upgrade from protected to public visibility
public new int Read7BitEncodedInt()
{
return base.Read7BitEncodedInt();
}
public void Seek(long pos, SeekOrigin origin)
{
BaseStream.Seek(pos, origin);
}
}
enum ResourceTypeCode
{
Null = 0,
String = 1,
Boolean = 2,
Char = 3,
Byte = 4,
SByte = 5,
Int16 = 6,
UInt16 = 7,
Int32 = 8,
UInt32 = 9,
Int64 = 10,
UInt64 = 11,
Single = 12,
Double = 13,
Decimal = 14,
DateTime = 0xF,
TimeSpan = 0x10,
LastPrimitive = 0x10,
ByteArray = 0x20,
Stream = 33,
StartOfUserTypes = 0x40
}
/// <summary>Holds the number used to identify resource files.</summary>
public const int MagicNumber = unchecked((int)0xBEEFCACE);
const int ResourceSetVersion = 2;
readonly MyBinaryReader reader;
readonly int version;
readonly int numResources;
readonly string[] typeTable;
readonly int[] namePositions;
readonly long fileStartPosition;
readonly long nameSectionPosition;
readonly long dataSectionPosition;
/// <summary>
/// Creates a new ResourcesFile.
/// </summary>
/// <param name="stream">Input stream.</param>
/// <param name="leaveOpen">Whether the stream should be help open when the ResourcesFile is disposed.</param>
/// <remarks>
/// The stream is must be held open while the ResourcesFile is in use.
/// The stream must be seekable; any operation using the ResourcesFile will end up seeking the stream.
/// </remarks>
public MyResourceReader(Stream stream, bool leaveOpen = true)
{
fileStartPosition = stream.Position;
reader = new MyBinaryReader(stream, leaveOpen);
const string ResourcesHeaderCorrupted = "Resources header corrupted.";
// Read ResourceManager header
// Check for magic number
int magicNum = reader.ReadInt32();
if (magicNum != MagicNumber)
throw new BadImageFormatException("Not a .resources file - invalid magic number");
// Assuming this is ResourceManager header V1 or greater, hopefully
// after the version number there is a number of bytes to skip
// to bypass the rest of the ResMgr header. For V2 or greater, we
// use this to skip to the end of the header
int resMgrHeaderVersion = reader.ReadInt32();
int numBytesToSkip = reader.ReadInt32();
if (numBytesToSkip < 0 || resMgrHeaderVersion < 0)
{
throw new BadImageFormatException(ResourcesHeaderCorrupted);
}
if (resMgrHeaderVersion > 1)
{
reader.BaseStream.Seek(numBytesToSkip, SeekOrigin.Current);
}
else
{
// We don't care about numBytesToSkip; read the rest of the header
// readerType:
reader.ReadString();
// resourceSetType:
reader.ReadString();
}
// Read RuntimeResourceSet header
// Do file version check
version = reader.ReadInt32();
if (version != ResourceSetVersion && version != 1)
throw new BadImageFormatException($"Unsupported resource set version: {version}");
numResources = reader.ReadInt32();
if (numResources < 0)
{
throw new BadImageFormatException(ResourcesHeaderCorrupted);
}
// Read type positions into type positions array.
// But delay initialize the type table.
int numTypes = reader.ReadInt32();
if (numTypes < 0)
{
throw new BadImageFormatException(ResourcesHeaderCorrupted);
}
typeTable = new string[numTypes];
for (int i = 0; i < numTypes; i++)
{
typeTable[i] = reader.ReadString();
}
// Prepare to read in the array of name hashes
// Note that the name hashes array is aligned to 8 bytes so
// we can use pointers into it on 64 bit machines. (4 bytes
// may be sufficient, but let's plan for the future)
// Skip over alignment stuff. All public .resources files
// should be aligned No need to verify the byte values.
long pos = reader.BaseStream.Position - fileStartPosition;
int alignBytes = unchecked((int)pos) & 7;
if (alignBytes != 0)
{
for (int i = 0; i < 8 - alignBytes; i++)
{
reader.ReadByte();
}
}
// Skip over the array of name hashes
try
{
reader.Seek(checked(4 * numResources), SeekOrigin.Current);
}
catch (OverflowException)
{
throw new BadImageFormatException(ResourcesHeaderCorrupted);
}
// Read in the array of relative positions for all the names.
namePositions = new int[numResources];
for (int i = 0; i < numResources; i++)
{
int namePosition = reader.ReadInt32();
if (namePosition < 0)
{
throw new BadImageFormatException(ResourcesHeaderCorrupted);
}
namePositions[i] = namePosition;
}
// Read location of data section.
int dataSectionOffset = reader.ReadInt32();
if (dataSectionOffset < 0)
{
throw new BadImageFormatException(ResourcesHeaderCorrupted);
}
// Store current location as start of name section
nameSectionPosition = reader.BaseStream.Position;
dataSectionPosition = fileStartPosition + dataSectionOffset;
// _nameSectionOffset should be <= _dataSectionOffset; if not, it's corrupt
if (dataSectionPosition < nameSectionPosition)
{
throw new BadImageFormatException(ResourcesHeaderCorrupted);
}
}
public void Dispose()
{
reader.Dispose();
}
string GetResourceName(int index, out int dataOffset)
{
long pos = nameSectionPosition + namePositions[index];
byte[] bytes;
lock (reader)
{
reader.Seek(pos, SeekOrigin.Begin);
// Can't use reader.ReadString, since it's using UTF-8!
int byteLen = reader.Read7BitEncodedInt();
if (byteLen < 0)
{
throw new BadImageFormatException("Resource name has negative length");
}
bytes = new byte[byteLen];
// We must read byteLen bytes, or we have a corrupted file.
// Use a blocking read in case the stream doesn't give us back
// everything immediately.
int count = byteLen;
while (count > 0)
{
int n = reader.Read(bytes, byteLen - count, count);
if (n == 0)
throw new BadImageFormatException("End of stream within a resource name");
count -= n;
}
dataOffset = reader.ReadInt32();
if (dataOffset < 0)
{
throw new BadImageFormatException("Negative data offset");
}
}
return Encoding.Unicode.GetString(bytes);
}
object LoadObject(int dataOffset)
{
try
{
lock (reader)
{
if (version == 1)
{
return LoadObjectV1(dataOffset);
}
else
{
return LoadObjectV2(dataOffset);
}
}
}
catch (EndOfStreamException e)
{
throw new BadImageFormatException("Invalid resource file", e);
}
}
string FindType(int typeIndex)
{
if (typeIndex < 0 || typeIndex >= typeTable.Length)
throw new BadImageFormatException("Type index out of bounds");
return typeTable[typeIndex];
}
// This takes a virtual offset into the data section and reads an Object
// from that location.
// Anyone who calls LoadObject should make sure they take a lock so
// no one can cause us to do a seek in here.
private object LoadObjectV1(int dataOffset)
{
Debug.Assert(System.Threading.Monitor.IsEntered(reader));
reader.Seek(dataSectionPosition + dataOffset, SeekOrigin.Begin);
int typeIndex = reader.Read7BitEncodedInt();
if (typeIndex == -1)
return null;
string typeName = FindType(typeIndex);
int comma = typeName.IndexOf(',');
if (comma > 0)
{
// strip assembly name
typeName = typeName.Substring(0, comma);
}
switch (typeName)
{
case "System.String":
return reader.ReadString();
case "System.Byte":
return reader.ReadByte();
case "System.SByte":
return reader.ReadSByte();
case "System.Int16":
return reader.ReadInt16();
case "System.UInt16":
return reader.ReadUInt16();
case "System.Int32":
return reader.ReadInt32();
case "System.UInt32":
return reader.ReadUInt32();
case "System.Int64":
return reader.ReadInt64();
case "System.UInt64":
return reader.ReadUInt64();
case "System.Single":
return reader.ReadSingle();
case "System.Double":
return reader.ReadDouble();
case "System.DateTime":
// Ideally we should use DateTime's ToBinary & FromBinary,
// but we can't for compatibility reasons.
return new DateTime(reader.ReadInt64());
case "System.TimeSpan":
return new TimeSpan(reader.ReadInt64());
case "System.Decimal":
int[] bits = new int[4];
for (int i = 0; i < bits.Length; i++)
bits[i] = reader.ReadInt32();
return new decimal(bits);
default:
return new ResourceSerializedObject(FindType(typeIndex), this, reader.BaseStream.Position);
}
}
private object LoadObjectV2(int dataOffset)
{
Debug.Assert(System.Threading.Monitor.IsEntered(reader));
reader.Seek(dataSectionPosition + dataOffset, SeekOrigin.Begin);
var typeCode = (ResourceTypeCode)reader.Read7BitEncodedInt();
switch (typeCode)
{
case ResourceTypeCode.Null:
return null;
case ResourceTypeCode.String:
return reader.ReadString();
case ResourceTypeCode.Boolean:
return reader.ReadBoolean();
case ResourceTypeCode.Char:
return (char)reader.ReadUInt16();
case ResourceTypeCode.Byte:
return reader.ReadByte();
case ResourceTypeCode.SByte:
return reader.ReadSByte();
case ResourceTypeCode.Int16:
return reader.ReadInt16();
case ResourceTypeCode.UInt16:
return reader.ReadUInt16();
case ResourceTypeCode.Int32:
return reader.ReadInt32();
case ResourceTypeCode.UInt32:
return reader.ReadUInt32();
case ResourceTypeCode.Int64:
return reader.ReadInt64();
case ResourceTypeCode.UInt64:
return reader.ReadUInt64();
case ResourceTypeCode.Single:
return reader.ReadSingle();
case ResourceTypeCode.Double:
return reader.ReadDouble();
case ResourceTypeCode.Decimal:
return reader.ReadDecimal();
case ResourceTypeCode.DateTime:
// Use DateTime's ToBinary & FromBinary.
long data = reader.ReadInt64();
return DateTime.FromBinary(data);
case ResourceTypeCode.TimeSpan:
long ticks = reader.ReadInt64();
return new TimeSpan(ticks);
// Special types
case ResourceTypeCode.ByteArray:
{
int len = reader.ReadInt32();
if (len < 0)
{
throw new BadImageFormatException("Resource with negative length");
}
return reader.ReadBytes(len);
}
case ResourceTypeCode.Stream:
{
int len = reader.ReadInt32();
if (len < 0)
{
throw new BadImageFormatException("Resource with negative length");
}
byte[] bytes = reader.ReadBytes(len);
return new MemoryStream(bytes, writable: false);
}
default:
if (typeCode < ResourceTypeCode.StartOfUserTypes)
{
throw new BadImageFormatException("Invalid typeCode");
}
return new ResourceSerializedObject(FindType(typeCode - ResourceTypeCode.StartOfUserTypes), this, reader.BaseStream.Position);
}
}
public IEnumerator<KeyValuePair<string, object>> GetEnumerator()
{
for (int i = 0; i < numResources; i++)
{
string name = GetResourceName(i, out int dataOffset);
object val = LoadObject(dataOffset);
yield return new KeyValuePair<string, object>(name, val);
}
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
public class ResourceSerializedObject
{
public string TypeName { get; }
readonly MyResourceReader file;
readonly long position;
internal ResourceSerializedObject(string typeName, MyResourceReader file, long position)
{
this.TypeName = typeName;
this.file = file;
this.position = position;
}
}
}
}