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PofReader.cs
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PofReader.cs
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using ItzWarty;
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Text;
namespace Dargon.PortableObjects {
public unsafe class PofReader : IPofReader
{
private readonly IPofContext context;
private readonly ISlotSource slots;
private static readonly SlotSourceFactory slotSourceFactory = new SlotSourceFactoryImpl();
private static readonly Dictionary<Type, Func<BinaryReader, object>> RESERVED_TYPE_READERS = new Dictionary<Type, Func<BinaryReader, object>> {
{typeof(void), reader => null},
{typeof(sbyte), (reader) => reader.ReadSByte()},
{typeof(byte), (reader) => reader.ReadByte()},
{typeof(short), (reader) => reader.ReadInt16()},
{typeof(ushort), (reader) => reader.ReadUInt16()},
{typeof(int), (reader) => reader.ReadInt32()},
{typeof(uint), (reader) => reader.ReadUInt32()},
{typeof(long), (reader) => reader.ReadInt64()},
{typeof(ulong), (reader) => reader.ReadUInt64()},
{typeof(float), (reader) => reader.ReadSingle()},
{typeof(double), (reader) => reader.ReadDouble()},
{typeof(char), (reader) => reader.ReadChar()},
{typeof(string), (reader) => reader.ReadNullTerminatedString()},
{typeof(bool), (reader) => reader.ReadByte() != 0 },
{typeof(Guid), (reader) => reader.ReadGuid() },
{typeof(object), (reader) => new object() },
{typeof(DateTime), (reader) => DateTime.FromBinary(reader.ReadInt64()).ToUniversalTime() },
{typeof(TimeSpan), (reader) => TimeSpan.FromTicks(reader.ReadInt64()) },
{typeof(Type), (reader) => { throw new InvalidOperationException("Static Reserved Type Readers map does not support serializing type instances."); }},
{typeof(byte[]), (reader) => reader.ReadBytes(reader.ReadInt32()) },
};
public PofReader(IPofContext context, ISlotSource slots)
{
this.context = context;
this.slots = slots;
}
public IPofContext Context { get { return context; } }
public sbyte ReadS8(int slot)
{
var value = slots[slot][0];
return *(sbyte*)&value;
}
public byte ReadU8(int slot) { return slots[slot][0]; }
public short ReadS16(int slot) { return BitConverter.ToInt16(slots[slot], 0); }
public ushort ReadU16(int slot) { return BitConverter.ToUInt16(slots[slot], 0); }
public int ReadS32(int slot) { return BitConverter.ToInt32(slots[slot], 0); }
public uint ReadU32(int slot) { return BitConverter.ToUInt32(slots[slot], 0); }
public long ReadS64(int slot) { return BitConverter.ToInt64(slots[slot], 0); }
public ulong ReadU64(int slot) { return BitConverter.ToUInt64(slots[slot], 0); }
public float ReadFloat(int slot) { return BitConverter.ToSingle(slots[slot], 0); }
public double ReadDouble(int slot) { return BitConverter.ToDouble(slots[slot], 0); }
public char ReadChar(int slot) { return BitConverter.ToChar(slots[slot], 0); }
public string ReadString(int slot)
{
using (var reader = GetSlotBinaryReader(slot)) {
return reader.ReadNullTerminatedString();
}
}
public bool ReadBoolean(int slot) { return slots[slot][0] != 0; }
public Guid ReadGuid(int slot) { return new Guid(slots[slot]); }
public DateTime ReadDateTime(int slot) { return DateTime.FromBinary(BitConverter.ToInt64(slots[slot], 0)).ToUniversalTime(); }
public TimeSpan ReadTimeSpan(int slot) { return TimeSpan.FromTicks(BitConverter.ToInt64(slots[slot], 0)); }
public Type ReadType(int slot) {
using (var ms = new MemoryStream(slots[slot]))
using (var reader = new BinaryReader(ms)) {
return ParseType(reader);
}
}
public byte[] ReadBytes(int slot) { return slots[slot]; }
public T ReadObject<T>(int slot) { return (T)ReadObject(slot); }
public T ReadObjectTypeless<T>(int slot) { return (T)ReadObjectTypeless(slot, typeof(T)); }
public object ReadObject(int slot) {
using (var reader = GetSlotBinaryReader(slot)) {
return ReadObjectInternal(reader, null);
}
}
public object ReadObjectTypeless(int slot, Type type) {
using (var reader = GetSlotBinaryReader(slot)) {
return ReadObjectInternal(reader, type);
}
}
private object ReadObjectInternal(BinaryReader reader, Type type) {
var inputType = type;
type = type ?? ParseType(reader);
if (type == typeof(void)) {
return null;
} else if (type == typeof(IEnumerable)) {
return ReadArrayInternal<object>(reader, false);
} else if (type.IsArray) {
return DispatchToReadArrayInternal(reader, type, false);
} else {
return ReadObjectWithoutTypeDescription(type, reader);
}
}
private object ReadObjectWithoutTypeDescription(Type type, BinaryReader reader)
{
if (context.IsReservedType(type)) {
return ReadReservedType(type, reader);
} else {
var instance = context.CreateInstance(type);
instance.Deserialize(new PofReader(context, slotSourceFactory.CreateFromBinaryReader(reader)));
if (instance is SpecialTypes.Base) {
return ((SpecialTypes.Base)instance).Unwrap();
} else {
return instance;
}
}
}
private object DispatchToReadArrayInternal(BinaryReader reader, Type arrayType, bool readType) {
var elementType = arrayType.GetElementType();
var helper = typeof(PofReader).GetMethod("DispatchToReadArrayInternalHelper", BindingFlags.NonPublic | BindingFlags.Instance).MakeGenericMethod(elementType);
return helper.Invoke(this, new object[] { reader, readType });
}
private object DispatchToReadArrayInternalHelper<TElement>(BinaryReader reader, bool readType) {
return ReadArrayInternal<TElement>(reader, readType);
}
private object ReadReservedType(Type type, BinaryReader reader) {
if (type == typeof(Type)) {
return ParseType(reader);
} else {
return RESERVED_TYPE_READERS[type](reader);
}
}
public T[] ReadArray<T>(int slot, bool elementsPolymorphic = false)
{
using (var stream = CreateSlotMemoryStream(slot))
using (var reader = new BinaryReader(stream, Encoding.UTF8, true)) {
return ReadArrayInternal<T>(reader, true);
}
}
private T[] ReadArrayInternal<T>(BinaryReader reader, bool readEnumerableTypeHeader) {
return (T[])ReadObjectInternal(reader, readEnumerableTypeHeader ? null : typeof(SpecialTypes.PortableArray<T>));
// if (readEnumerableTypeHeader) {
// ParseType(reader); // throwaway, equals IEnumerable
// }
// var type = ParseType(reader);
// int length = reader.ReadInt32();
// Trace.Assert(typeof(T).IsAssignableFrom(type));
//
// var expectedType = elementsPolymorphic ? null : type;
// return Util.Generate(length, i => (T)ReadObjectInternal(reader, expectedType));
}
public TCollection ReadCollection<T, TCollection>(int slot, bool elementsPolymorphic = false) where TCollection : class, ICollection<T>, new() {
return ReadCollection<T, TCollection>(slot, new TCollection(), elementsPolymorphic);
}
public TCollection ReadCollection<T, TCollection>(int slot, TCollection collection, bool elementsPolymorphic = false) where TCollection : class, ICollection<T> {
using (var stream = CreateSlotMemoryStream(slot))
using (var reader = new BinaryReader(stream, Encoding.UTF8, true)) {
return ReadCollectionInternal<T, TCollection>(reader, collection, elementsPolymorphic, true);
}
}
private TCollection ReadCollectionInternal<T, TCollection>(BinaryReader reader, TCollection collection, bool elementsPolymorphic, bool readIenumerableTypeHeader) where TCollection : class, ICollection<T> {
var elements = ReadArrayInternal<T>(reader, readIenumerableTypeHeader);
foreach (var element in elements) {
collection.Add(element);
}
return collection;
}
public IDictionary<TKey, TValue> ReadMap<TKey, TValue>(int slot, bool keysPolymorphic = false, bool valuesPolymorphic = false, IDictionary<TKey, TValue> dict = null) {
using (var stream = CreateSlotMemoryStream(slot))
using (var reader = new BinaryReader(stream, Encoding.UTF8, true))
{
return ReadMapInternal(keysPolymorphic, valuesPolymorphic, dict, reader, true);
}
}
private IDictionary<TKey, TValue> ReadMapInternal<TKey, TValue>(bool keysPolymorphic, bool valuesPolymorphic, IDictionary<TKey, TValue> dict, BinaryReader reader, bool readDictionaryHeader) {
var readDictionary = (IDictionary<TKey, TValue>)ReadObjectInternal(reader, readDictionaryHeader ? null : typeof(SpecialTypes.PortableMap<TKey, TValue>));
if (dict == null) {
return readDictionary;
} else {
foreach (var kvp in readDictionary) {
dict.Add(kvp);
}
return dict;
}
}
private BinaryReader GetSlotBinaryReader(int slot)
{
return new BinaryReader(CreateSlotMemoryStream(slot));
}
private MemoryStream CreateSlotMemoryStream(int slot)
{
return new MemoryStream(slots[slot]);
}
private Type ParseType(BinaryReader reader)
{
var typeDescription = ParseTypeDescription(reader);
return context.GetTypeFromDescription(typeDescription);
}
private PofTypeDescription ParseTypeDescription(BinaryReader reader)
{
int typeId = reader.ReadInt32();
var type = context.GetTypeOrNull(typeId);
if (type == null)
throw new TypeIdNotFoundException(typeId);
if (type == typeof(Array)) {
var elementType = ParseType(reader);
var arrayType = elementType.MakeArrayType();
return new PofTypeDescription(new [] { arrayType });
} else if (!type.IsGenericTypeDefinition)
return new PofTypeDescription(new[] { type });
else
{
var genericArgumentSpecifications = type.GetGenericArguments();
var genericArguments = Util.Generate(
genericArgumentSpecifications.Length,
i => ParseType(reader));
return new PofTypeDescription(Util.Concat<Type>(type, genericArguments));
}
}
}
}