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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable enable
using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Text;
namespace System.Resources
#if RESOURCES_EXTENSIONS
.Extensions
#endif
{
#if RESOURCES_EXTENSIONS
using ResourceReader = DeserializingResourceReader;
#endif
// Provides the default implementation of IResourceReader, reading
// .resources file from the system default binary format. This class
// can be treated as an enumerator once.
//
// See the RuntimeResourceSet overview for details on the system
// default file format.
//
internal struct ResourceLocator
{
internal object? _value; // Can be null. Consider WeakReference instead?
internal int _dataPos;
internal ResourceLocator(int dataPos, object? value)
{
_dataPos = dataPos;
_value = value;
}
internal int DataPosition
{
get { return _dataPos; }
//set { _dataPos = value; }
}
// Allows adding in profiling data in a future version, or a special
// resource profiling build. We could also use WeakReference.
internal object? Value
{
get { return _value; }
set { _value = value; }
}
internal static bool CanCache(ResourceTypeCode value)
{
Debug.Assert(value >= 0, "negative ResourceTypeCode. What?");
return value <= ResourceTypeCode.LastPrimitive;
}
}
public sealed partial class
#if RESOURCES_EXTENSIONS
DeserializingResourceReader
#else
ResourceReader
#endif
: IResourceReader
{
// A reasonable default buffer size for reading from files, especially
// when we will likely be seeking frequently. Could be smaller, but does
// it make sense to use anything less than one page?
private const int DefaultFileStreamBufferSize = 4096;
private BinaryReader _store; // backing store we're reading from.
// Used by RuntimeResourceSet and this class's enumerator. Maps
// resource name to a value, a ResourceLocator, or a
// LooselyLinkedManifestResource.
internal Dictionary<string, ResourceLocator>? _resCache;
private long _nameSectionOffset; // Offset to name section of file.
private long _dataSectionOffset; // Offset to Data section of file.
// Note this class is tightly coupled with UnmanagedMemoryStream.
// At runtime when getting an embedded resource from an assembly,
// we're given an UnmanagedMemoryStream referring to the mmap'ed portion
// of the assembly. The pointers here are pointers into that block of
// memory controlled by the OS's loader.
private int[]? _nameHashes; // hash values for all names.
private unsafe int* _nameHashesPtr; // In case we're using UnmanagedMemoryStream
private int[]? _namePositions; // relative locations of names
private unsafe int* _namePositionsPtr; // If we're using UnmanagedMemoryStream
private Type?[] _typeTable = null!; // Lazy array of Types for resource values.
private int[] _typeNamePositions = null!; // To delay initialize type table
private int _numResources; // Num of resources files, in case arrays aren't allocated.
// We'll include a separate code path that uses UnmanagedMemoryStream to
// avoid allocating String objects and the like.
private UnmanagedMemoryStream? _ums;
// Version number of .resources file, for compatibility
private int _version;
public
#if RESOURCES_EXTENSIONS
DeserializingResourceReader(string fileName)
#else
ResourceReader(string fileName)
#endif
{
_resCache = new Dictionary<string, ResourceLocator>(FastResourceComparer.Default);
_store = new BinaryReader(new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read, DefaultFileStreamBufferSize, FileOptions.RandomAccess), Encoding.UTF8);
try
{
ReadResources();
}
catch
{
_store.Close(); // If we threw an exception, close the file.
throw;
}
}
public
#if RESOURCES_EXTENSIONS
DeserializingResourceReader(Stream stream)
#else
ResourceReader(Stream stream)
#endif
{
if (stream == null)
throw new ArgumentNullException(nameof(stream));
if (!stream.CanRead)
throw new ArgumentException(SR.Argument_StreamNotReadable);
_resCache = new Dictionary<string, ResourceLocator>(FastResourceComparer.Default);
_store = new BinaryReader(stream, Encoding.UTF8);
// We have a faster code path for reading resource files from an assembly.
_ums = stream as UnmanagedMemoryStream;
ReadResources();
}
public void Close()
{
Dispose(true);
}
public void Dispose()
{
Close();
}
private unsafe void Dispose(bool disposing)
{
if (_store != null)
{
_resCache = null;
if (disposing)
{
// Close the stream in a thread-safe way. This fix means
// that we may call Close n times, but that's safe.
BinaryReader copyOfStore = _store;
_store = null!; // TODO-NULLABLE: Avoid nulling out in Dispose
if (copyOfStore != null)
copyOfStore.Close();
}
_store = null!; // TODO-NULLABLE: Avoid nulling out in Dispose
_namePositions = null;
_nameHashes = null;
_ums = null;
_namePositionsPtr = null;
_nameHashesPtr = null;
}
}
internal static unsafe int ReadUnalignedI4(int* p)
{
byte* buffer = (byte*)p;
// Unaligned, little endian format
return buffer[0] | (buffer[1] << 8) | (buffer[2] << 16) | (buffer[3] << 24);
}
private void SkipString()
{
int stringLength = _store.Read7BitEncodedInt();
if (stringLength < 0)
{
throw new BadImageFormatException(SR.BadImageFormat_NegativeStringLength);
}
_store.BaseStream.Seek(stringLength, SeekOrigin.Current);
}
private unsafe int GetNameHash(int index)
{
Debug.Assert(index >= 0 && index < _numResources, "Bad index into hash array. index: " + index);
if (_ums == null)
{
Debug.Assert(_nameHashes != null && _nameHashesPtr == null, "Internal state mangled.");
return _nameHashes[index];
}
else
{
Debug.Assert(_nameHashes == null && _nameHashesPtr != null, "Internal state mangled.");
return ReadUnalignedI4(&_nameHashesPtr[index]);
}
}
private unsafe int GetNamePosition(int index)
{
Debug.Assert(index >= 0 && index < _numResources, "Bad index into name position array. index: " + index);
int r;
if (_ums == null)
{
Debug.Assert(_namePositions != null && _namePositionsPtr == null, "Internal state mangled.");
r = _namePositions[index];
}
else
{
Debug.Assert(_namePositions == null && _namePositionsPtr != null, "Internal state mangled.");
r = ReadUnalignedI4(&_namePositionsPtr[index]);
}
if (r < 0 || r > _dataSectionOffset - _nameSectionOffset)
{
throw new FormatException(SR.Format(SR.BadImageFormat_ResourcesNameInvalidOffset, r));
}
return r;
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
public IDictionaryEnumerator GetEnumerator()
{
if (_resCache == null)
throw new InvalidOperationException(SR.ResourceReaderIsClosed);
return new ResourceEnumerator(this);
}
internal ResourceEnumerator GetEnumeratorInternal()
{
return new ResourceEnumerator(this);
}
// From a name, finds the associated virtual offset for the data.
// To read the data, seek to _dataSectionOffset + dataPos, then
// read the resource type & data.
// This does a binary search through the names.
internal int FindPosForResource(string name)
{
Debug.Assert(_store != null, "ResourceReader is closed!");
int hash = FastResourceComparer.HashFunction(name);
// Binary search over the hashes. Use the _namePositions array to
// determine where they exist in the underlying stream.
int lo = 0;
int hi = _numResources - 1;
int index = -1;
bool success = false;
while (lo <= hi)
{
index = (lo + hi) >> 1;
// Do NOT use subtraction here, since it will wrap for large
// negative numbers.
int currentHash = GetNameHash(index);
int c;
if (currentHash == hash)
c = 0;
else if (currentHash < hash)
c = -1;
else
c = 1;
if (c == 0)
{
success = true;
break;
}
if (c < 0)
lo = index + 1;
else
hi = index - 1;
}
if (!success)
{
return -1;
}
// index is the location in our hash array that corresponds with a
// value in the namePositions array.
// There could be collisions in our hash function. Check on both sides
// of index to find the range of hash values that are equal to the
// target hash value.
if (lo != index)
{
lo = index;
while (lo > 0 && GetNameHash(lo - 1) == hash)
lo--;
}
if (hi != index)
{
hi = index;
while (hi < _numResources - 1 && GetNameHash(hi + 1) == hash)
hi++;
}
lock (this)
{
for (int i = lo; i <= hi; i++)
{
_store.BaseStream.Seek(_nameSectionOffset + GetNamePosition(i), SeekOrigin.Begin);
if (CompareStringEqualsName(name))
{
int dataPos = _store.ReadInt32();
if (dataPos < 0 || dataPos >= _store.BaseStream.Length - _dataSectionOffset)
{
throw new FormatException(SR.Format(SR.BadImageFormat_ResourcesDataInvalidOffset, dataPos));
}
return dataPos;
}
}
}
return -1;
}
// This compares the String in the .resources file at the current position
// with the string you pass in.
// Whoever calls this method should make sure that they take a lock
// so no one else can cause us to seek in the stream.
private unsafe bool CompareStringEqualsName(string name)
{
Debug.Assert(_store != null, "ResourceReader is closed!");
int byteLen = _store.Read7BitEncodedInt();
if (byteLen < 0)
{
throw new BadImageFormatException(SR.BadImageFormat_NegativeStringLength);
}
if (_ums != null)
{
byte* bytes = _ums.PositionPointer;
// Skip over the data in the Stream, positioning ourselves right after it.
_ums.Seek(byteLen, SeekOrigin.Current);
if (_ums.Position > _ums.Length)
{
throw new BadImageFormatException(SR.BadImageFormat_ResourcesNameTooLong);
}
// On 64-bit machines, these char*'s may be misaligned. Use a
// byte-by-byte comparison instead.
//return FastResourceComparer.CompareOrdinal((char*)bytes, byteLen/2, name) == 0;
return FastResourceComparer.CompareOrdinal(bytes, byteLen, name) == 0;
}
else
{
// This code needs to be fast
byte[] bytes = new byte[byteLen];
int numBytesToRead = byteLen;
while (numBytesToRead > 0)
{
int n = _store.Read(bytes, byteLen - numBytesToRead, numBytesToRead);
if (n == 0)
throw new BadImageFormatException(SR.BadImageFormat_ResourceNameCorrupted);
numBytesToRead -= n;
}
return FastResourceComparer.CompareOrdinal(bytes, byteLen / 2, name) == 0;
}
}
// This is used in the enumerator. The enumerator iterates from 0 to n
// of our resources and this returns the resource name for a particular
// index. The parameter is NOT a virtual offset.
private unsafe string AllocateStringForNameIndex(int index, out int dataOffset)
{
Debug.Assert(_store != null, "ResourceReader is closed!");
byte[] bytes;
int byteLen;
long nameVA = GetNamePosition(index);
lock (this)
{
_store.BaseStream.Seek(nameVA + _nameSectionOffset, SeekOrigin.Begin);
// Can't use _store.ReadString, since it's using UTF-8!
byteLen = _store.Read7BitEncodedInt();
if (byteLen < 0)
{
throw new BadImageFormatException(SR.BadImageFormat_NegativeStringLength);
}
if (_ums != null)
{
if (_ums.Position > _ums.Length - byteLen)
throw new BadImageFormatException(SR.Format(SR.BadImageFormat_ResourcesIndexTooLong, index));
string? s = null;
char* charPtr = (char*)_ums.PositionPointer;
s = new string(charPtr, 0, byteLen / 2);
_ums.Position += byteLen;
dataOffset = _store.ReadInt32();
if (dataOffset < 0 || dataOffset >= _store.BaseStream.Length - _dataSectionOffset)
{
throw new FormatException(SR.Format(SR.BadImageFormat_ResourcesDataInvalidOffset, dataOffset));
}
return s;
}
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 = _store.Read(bytes, byteLen - count, count);
if (n == 0)
throw new EndOfStreamException(SR.Format(SR.BadImageFormat_ResourceNameCorrupted_NameIndex, index));
count -= n;
}
dataOffset = _store.ReadInt32();
if (dataOffset < 0 || dataOffset >= _store.BaseStream.Length - _dataSectionOffset)
{
throw new FormatException(SR.Format(SR.BadImageFormat_ResourcesDataInvalidOffset, dataOffset));
}
}
return Encoding.Unicode.GetString(bytes, 0, byteLen);
}
// This is used in the enumerator. The enumerator iterates from 0 to n
// of our resources and this returns the resource value for a particular
// index. The parameter is NOT a virtual offset.
private object? GetValueForNameIndex(int index)
{
Debug.Assert(_store != null, "ResourceReader is closed!");
long nameVA = GetNamePosition(index);
lock (this)
{
_store.BaseStream.Seek(nameVA + _nameSectionOffset, SeekOrigin.Begin);
SkipString();
int dataPos = _store.ReadInt32();
if (dataPos < 0 || dataPos >= _store.BaseStream.Length - _dataSectionOffset)
{
throw new FormatException(SR.Format(SR.BadImageFormat_ResourcesDataInvalidOffset, dataPos));
}
ResourceTypeCode junk;
if (_version == 1)
return LoadObjectV1(dataPos);
else
return LoadObjectV2(dataPos, out junk);
}
}
// This takes a virtual offset into the data section and reads a String
// 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.
internal string? LoadString(int pos)
{
Debug.Assert(_store != null, "ResourceReader is closed!");
_store.BaseStream.Seek(_dataSectionOffset + pos, SeekOrigin.Begin);
string? s = null;
int typeIndex = _store.Read7BitEncodedInt();
if (_version == 1)
{
if (typeIndex == -1)
return null;
if (FindType(typeIndex) != typeof(string))
throw new InvalidOperationException(SR.Format(SR.InvalidOperation_ResourceNotString_Type, FindType(typeIndex).FullName));
s = _store.ReadString();
}
else
{
ResourceTypeCode typeCode = (ResourceTypeCode)typeIndex;
if (typeCode != ResourceTypeCode.String && typeCode != ResourceTypeCode.Null)
{
string? typeString;
if (typeCode < ResourceTypeCode.StartOfUserTypes)
typeString = typeCode.ToString();
else
typeString = FindType(typeCode - ResourceTypeCode.StartOfUserTypes).FullName;
throw new InvalidOperationException(SR.Format(SR.InvalidOperation_ResourceNotString_Type, typeString));
}
if (typeCode == ResourceTypeCode.String) // ignore Null
s = _store.ReadString();
}
return s;
}
// Called from RuntimeResourceSet
internal object? LoadObject(int pos)
{
if (_version == 1)
return LoadObjectV1(pos);
ResourceTypeCode typeCode;
return LoadObjectV2(pos, out typeCode);
}
internal object? LoadObject(int pos, out ResourceTypeCode typeCode)
{
if (_version == 1)
{
object? o = LoadObjectV1(pos);
typeCode = (o is string) ? ResourceTypeCode.String : ResourceTypeCode.StartOfUserTypes;
return o;
}
return LoadObjectV2(pos, out typeCode);
}
// 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.
internal object? LoadObjectV1(int pos)
{
Debug.Assert(_store != null, "ResourceReader is closed!");
Debug.Assert(_version == 1, ".resources file was not a V1 .resources file!");
try
{
// mega try-catch performs exceptionally bad on x64; factored out body into
// _LoadObjectV1 and wrap here.
return _LoadObjectV1(pos);
}
catch (EndOfStreamException eof)
{
throw new BadImageFormatException(SR.BadImageFormat_TypeMismatch, eof);
}
catch (ArgumentOutOfRangeException e)
{
throw new BadImageFormatException(SR.BadImageFormat_TypeMismatch, e);
}
}
private object? _LoadObjectV1(int pos)
{
_store.BaseStream.Seek(_dataSectionOffset + pos, SeekOrigin.Begin);
int typeIndex = _store.Read7BitEncodedInt();
if (typeIndex == -1)
return null;
Type type = FindType(typeIndex);
// Consider putting in logic to see if this type is a
// primitive or a value type first, so we can reach the
// deserialization code faster for arbitrary objects.
if (type == typeof(string))
return _store.ReadString();
else if (type == typeof(int))
return _store.ReadInt32();
else if (type == typeof(byte))
return _store.ReadByte();
else if (type == typeof(sbyte))
return _store.ReadSByte();
else if (type == typeof(short))
return _store.ReadInt16();
else if (type == typeof(long))
return _store.ReadInt64();
else if (type == typeof(ushort))
return _store.ReadUInt16();
else if (type == typeof(uint))
return _store.ReadUInt32();
else if (type == typeof(ulong))
return _store.ReadUInt64();
else if (type == typeof(float))
return _store.ReadSingle();
else if (type == typeof(double))
return _store.ReadDouble();
else if (type == typeof(DateTime))
{
// Ideally we should use DateTime's ToBinary & FromBinary,
// but we can't for compatibility reasons.
return new DateTime(_store.ReadInt64());
}
else if (type == typeof(TimeSpan))
return new TimeSpan(_store.ReadInt64());
else if (type == typeof(decimal))
{
int[] bits = new int[4];
for (int i = 0; i < bits.Length; i++)
bits[i] = _store.ReadInt32();
return new decimal(bits);
}
else
{
return DeserializeObject(typeIndex);
}
}
internal object? LoadObjectV2(int pos, out ResourceTypeCode typeCode)
{
Debug.Assert(_store != null, "ResourceReader is closed!");
Debug.Assert(_version >= 2, ".resources file was not a V2 (or higher) .resources file!");
try
{
// mega try-catch performs exceptionally bad on x64; factored out body into
// _LoadObjectV2 and wrap here.
return _LoadObjectV2(pos, out typeCode);
}
catch (EndOfStreamException eof)
{
throw new BadImageFormatException(SR.BadImageFormat_TypeMismatch, eof);
}
catch (ArgumentOutOfRangeException e)
{
throw new BadImageFormatException(SR.BadImageFormat_TypeMismatch, e);
}
}
private object? _LoadObjectV2(int pos, out ResourceTypeCode typeCode)
{
_store.BaseStream.Seek(_dataSectionOffset + pos, SeekOrigin.Begin);
typeCode = (ResourceTypeCode)_store.Read7BitEncodedInt();
switch (typeCode)
{
case ResourceTypeCode.Null:
return null;
case ResourceTypeCode.String:
return _store.ReadString();
case ResourceTypeCode.Boolean:
return _store.ReadBoolean();
case ResourceTypeCode.Char:
return (char)_store.ReadUInt16();
case ResourceTypeCode.Byte:
return _store.ReadByte();
case ResourceTypeCode.SByte:
return _store.ReadSByte();
case ResourceTypeCode.Int16:
return _store.ReadInt16();
case ResourceTypeCode.UInt16:
return _store.ReadUInt16();
case ResourceTypeCode.Int32:
return _store.ReadInt32();
case ResourceTypeCode.UInt32:
return _store.ReadUInt32();
case ResourceTypeCode.Int64:
return _store.ReadInt64();
case ResourceTypeCode.UInt64:
return _store.ReadUInt64();
case ResourceTypeCode.Single:
return _store.ReadSingle();
case ResourceTypeCode.Double:
return _store.ReadDouble();
case ResourceTypeCode.Decimal:
return _store.ReadDecimal();
case ResourceTypeCode.DateTime:
// Use DateTime's ToBinary & FromBinary.
long data = _store.ReadInt64();
return DateTime.FromBinary(data);
case ResourceTypeCode.TimeSpan:
long ticks = _store.ReadInt64();
return new TimeSpan(ticks);
// Special types
case ResourceTypeCode.ByteArray:
{
int len = _store.ReadInt32();
if (len < 0)
{
throw new BadImageFormatException(SR.Format(SR.BadImageFormat_ResourceDataLengthInvalid, len));
}
if (_ums == null)
{
if (len > _store.BaseStream.Length)
{
throw new BadImageFormatException(SR.Format(SR.BadImageFormat_ResourceDataLengthInvalid, len));
}
return _store.ReadBytes(len);
}
if (len > _ums.Length - _ums.Position)
{
throw new BadImageFormatException(SR.Format(SR.BadImageFormat_ResourceDataLengthInvalid, len));
}
byte[] bytes = new byte[len];
int r = _ums.Read(bytes, 0, len);
Debug.Assert(r == len, "ResourceReader needs to use a blocking read here. (Call _store.ReadBytes(len)?)");
return bytes;
}
case ResourceTypeCode.Stream:
{
int len = _store.ReadInt32();
if (len < 0)
{
throw new BadImageFormatException(SR.Format(SR.BadImageFormat_ResourceDataLengthInvalid, len));
}
if (_ums == null)
{
byte[] bytes = _store.ReadBytes(len);
// Lifetime of memory == lifetime of this stream.
return new PinnedBufferMemoryStream(bytes);
}
// make sure we don't create an UnmanagedMemoryStream that is longer than the resource stream.
if (len > _ums.Length - _ums.Position)
{
throw new BadImageFormatException(SR.Format(SR.BadImageFormat_ResourceDataLengthInvalid, len));
}
// For the case that we've memory mapped in the .resources
// file, just return a Stream pointing to that block of memory.
unsafe
{
return new UnmanagedMemoryStream(_ums.PositionPointer, len, len, FileAccess.Read);
}
}
default:
if (typeCode < ResourceTypeCode.StartOfUserTypes)
{
throw new BadImageFormatException(SR.BadImageFormat_TypeMismatch);
}
break;
}
// Normal serialized objects
int typeIndex = typeCode - ResourceTypeCode.StartOfUserTypes;
return DeserializeObject(typeIndex);
}
// Reads in the header information for a .resources file. Verifies some
// of the assumptions about this resource set, and builds the class table
// for the default resource file format.
private void ReadResources()
{
Debug.Assert(_store != null, "ResourceReader is closed!");
try
{
// mega try-catch performs exceptionally bad on x64; factored out body into
// _ReadResources and wrap here.
_ReadResources();
}
catch (EndOfStreamException eof)
{
throw new BadImageFormatException(SR.BadImageFormat_ResourcesHeaderCorrupted, eof);
}
catch (IndexOutOfRangeException e)
{
throw new BadImageFormatException(SR.BadImageFormat_ResourcesHeaderCorrupted, e);
}
}
private void _ReadResources()
{
// Read ResourceManager header
// Check for magic number
int magicNum = _store.ReadInt32();
if (magicNum != ResourceManager.MagicNumber)
throw new ArgumentException(SR.Resources_StreamNotValid);
// 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 = _store.ReadInt32();
int numBytesToSkip = _store.ReadInt32();
if (numBytesToSkip < 0 || resMgrHeaderVersion < 0)
{
throw new BadImageFormatException(SR.BadImageFormat_ResourcesHeaderCorrupted);
}
if (resMgrHeaderVersion > 1)
{
_store.BaseStream.Seek(numBytesToSkip, SeekOrigin.Current);
}
else
{
// We don't care about numBytesToSkip; read the rest of the header
// Read in type name for a suitable ResourceReader
// Note ResourceWriter & InternalResGen use different Strings.
string readerType = _store.ReadString();
if (!ValidateReaderType(readerType))
throw new NotSupportedException(SR.Format(SR.NotSupported_WrongResourceReader_Type, readerType));
// Skip over type name for a suitable ResourceSet
SkipString();
}
// Read RuntimeResourceSet header
// Do file version check
int version = _store.ReadInt32();
if (version != RuntimeResourceSet.Version && version != 1)
throw new ArgumentException(SR.Format(SR.Arg_ResourceFileUnsupportedVersion, RuntimeResourceSet.Version, version));
_version = version;
_numResources = _store.ReadInt32();
if (_numResources < 0)
{
throw new BadImageFormatException(SR.BadImageFormat_ResourcesHeaderCorrupted);
}
// Read type positions into type positions array.
// But delay initialize the type table.
int numTypes = _store.ReadInt32();
if (numTypes < 0)
{
throw new BadImageFormatException(SR.BadImageFormat_ResourcesHeaderCorrupted);
}
_typeTable = new Type[numTypes];
_typeNamePositions = new int[numTypes];
for (int i = 0; i < numTypes; i++)
{
_typeNamePositions[i] = (int)_store.BaseStream.Position;
// Skip over the Strings in the file. Don't create types.
SkipString();
}
// 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 = _store.BaseStream.Position;
int alignBytes = ((int)pos) & 7;
if (alignBytes != 0)
{
for (int i = 0; i < 8 - alignBytes; i++)
{
_store.ReadByte();
}
}
// Read in the array of name hashes
if (_ums == null)
{
_nameHashes = new int[_numResources];
for (int i = 0; i < _numResources; i++)
{
_nameHashes[i] = _store.ReadInt32();
}
}
else
{
int seekPos = unchecked(4 * _numResources);
if (seekPos < 0)
{
throw new BadImageFormatException(SR.BadImageFormat_ResourcesHeaderCorrupted);
}
unsafe
{
_nameHashesPtr = (int*)_ums.PositionPointer;
// Skip over the array of nameHashes.
_ums.Seek(seekPos, SeekOrigin.Current);
// get the position pointer once more to check that the whole table is within the stream
byte* junk = _ums.PositionPointer;
}
}
// Read in the array of relative positions for all the names.
if (_ums == null)
{
_namePositions = new int[_numResources];
for (int i = 0; i < _numResources; i++)
{
int namePosition = _store.ReadInt32();
if (namePosition < 0)
{
throw new BadImageFormatException(SR.BadImageFormat_ResourcesHeaderCorrupted);
}
_namePositions[i] = namePosition;
}
}
else
{
int seekPos = unchecked(4 * _numResources);
if (seekPos < 0)
{
throw new BadImageFormatException(SR.BadImageFormat_ResourcesHeaderCorrupted);
}
unsafe
{
_namePositionsPtr = (int*)_ums.PositionPointer;
// Skip over the array of namePositions.
_ums.Seek(seekPos, SeekOrigin.Current);
// get the position pointer once more to check that the whole table is within the stream
byte* junk = _ums.PositionPointer;
}
}
// Read location of data section.
_dataSectionOffset = _store.ReadInt32();
if (_dataSectionOffset < 0)
{
throw new BadImageFormatException(SR.BadImageFormat_ResourcesHeaderCorrupted);
}
// Store current location as start of name section
_nameSectionOffset = _store.BaseStream.Position;
// _nameSectionOffset should be <= _dataSectionOffset; if not, it's corrupt
if (_dataSectionOffset < _nameSectionOffset)
{
throw new BadImageFormatException(SR.BadImageFormat_ResourcesHeaderCorrupted);
}
}
// This allows us to delay-initialize the Type[]. This might be a
// good startup time savings, since we might have to load assemblies
// and initialize Reflection.
private Type FindType(int typeIndex)
{
if (typeIndex < 0 || typeIndex >= _typeTable.Length)
{
throw new BadImageFormatException(SR.BadImageFormat_InvalidType);
}
if (_typeTable[typeIndex] == null)
{
long oldPos = _store.BaseStream.Position;
try
{
_store.BaseStream.Position = _typeNamePositions[typeIndex];
string typeName = _store.ReadString();
_typeTable[typeIndex] = Type.GetType(typeName, true);
}
// If serialization isn't supported, we convert FileNotFoundException to
// NotSupportedException for consistency with v2. This is a corner-case, but the
// idea is that we want to give the user a more accurate error message. Even if
// the dependency were found, we know it will require serialization since it
// can't be one of the types we special case. So if the dependency were found,
// it would go down the serialization code path, resulting in NotSupported for
// SKUs without serialization.
//
// We don't want to regress the expected case by checking the type info before
// getting to Type.GetType -- this is costly with v1 resource formats.
catch (FileNotFoundException)
{
throw new NotSupportedException(SR.NotSupported_ResourceObjectSerialization);
}
finally
{
_store.BaseStream.Position = oldPos;
}
}
Debug.Assert(_typeTable[typeIndex] != null, "Should have found a type!");
return _typeTable[typeIndex]!; // TODO-NULLABLE: Indexer nullability tracked (https://github.com/dotnet/roslyn/issues/34644)
}
private string TypeNameFromTypeCode(ResourceTypeCode typeCode)
{
Debug.Assert(typeCode >= 0, "can't be negative");
if (typeCode < ResourceTypeCode.StartOfUserTypes)
{
Debug.Assert(!string.Equals(typeCode.ToString(), "LastPrimitive"), "Change ResourceTypeCode metadata order so LastPrimitive isn't what Enum.ToString prefers.");
return "ResourceTypeCode." + typeCode.ToString();
}
else
{
int typeIndex = typeCode - ResourceTypeCode.StartOfUserTypes;
Debug.Assert(typeIndex >= 0 && typeIndex < _typeTable.Length, "TypeCode is broken or corrupted!");
long oldPos = _store.BaseStream.Position;
try
{
_store.BaseStream.Position = _typeNamePositions[typeIndex];
return _store.ReadString();
}
finally
{
_store.BaseStream.Position = oldPos;
}
}
}
internal sealed class ResourceEnumerator : IDictionaryEnumerator
{
private const int ENUM_DONE = int.MinValue;
private const int ENUM_NOT_STARTED = -1;
private ResourceReader _reader;
private bool _currentIsValid;
private int _currentName;
private int _dataPosition; // cached for case-insensitive table
internal ResourceEnumerator(ResourceReader reader)
{
_currentName = ENUM_NOT_STARTED;
_reader = reader;
_dataPosition = -2;
}
public bool MoveNext()
{
if (_currentName == _reader._numResources - 1 || _currentName == ENUM_DONE)
{
_currentIsValid = false;
_currentName = ENUM_DONE;
return false;
}
_currentIsValid = true;
_currentName++;
return true;
}
public object Key
{
get
{
if (_currentName == ENUM_DONE) throw new InvalidOperationException(SR.InvalidOperation_EnumEnded);
if (!_currentIsValid) throw new InvalidOperationException(SR.InvalidOperation_EnumNotStarted);
if (_reader._resCache == null) throw new InvalidOperationException(SR.ResourceReaderIsClosed);
return _reader.AllocateStringForNameIndex(_currentName, out _dataPosition);
}
}
#pragma warning disable CS8612 // TODO-NULLABLE: Covariance in interfaces (https://github.com/dotnet/roslyn/issues/35227)
public object Current => Entry;
#pragma warning restore CS8612
// Warning: This requires that you call the Key or Entry property FIRST before calling it!
internal int DataPosition => _dataPosition;
public DictionaryEntry Entry
{
get
{
if (_currentName == ENUM_DONE) throw new InvalidOperationException(SR.InvalidOperation_EnumEnded);
if (!_currentIsValid) throw new InvalidOperationException(SR.InvalidOperation_EnumNotStarted);
if (_reader._resCache == null) throw new InvalidOperationException(SR.ResourceReaderIsClosed);
string key;
object? value = null;
lock (_reader)
{ // locks should be taken in the same order as in RuntimeResourceSet.GetObject to avoid deadlock
lock (_reader._resCache)
{
key = _reader.AllocateStringForNameIndex(_currentName, out _dataPosition); // AllocateStringForNameIndex could lock on _reader
ResourceLocator locator;
if (_reader._resCache.TryGetValue(key, out locator))
{
value = locator.Value;
}
if (value == null)
{
if (_dataPosition == -1)
value = _reader.GetValueForNameIndex(_currentName);
else
value = _reader.LoadObject(_dataPosition);
// If enumeration and subsequent lookups happen very
// frequently in the same process, add a ResourceLocator
// to _resCache here. But WinForms enumerates and
// just about everyone else does lookups. So caching
// here may bloat working set.
}
}
}
return new DictionaryEntry(key, value);
}
}
public object? Value
{
get
{
if (_currentName == ENUM_DONE) throw new InvalidOperationException(SR.InvalidOperation_EnumEnded);
if (!_currentIsValid) throw new InvalidOperationException(SR.InvalidOperation_EnumNotStarted);
if (_reader._resCache == null) throw new InvalidOperationException(SR.ResourceReaderIsClosed);
// Consider using _resCache here, eventually, if
// this proves to be an interesting perf scenario.
// But mixing lookups and enumerators shouldn't be
// particularly compelling.
return _reader.GetValueForNameIndex(_currentName);
}
}
public void Reset()
{
if (_reader._resCache == null) throw new InvalidOperationException(SR.ResourceReaderIsClosed);
_currentIsValid = false;
_currentName = ENUM_NOT_STARTED;
}
}
}
}
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