mirror of
https://github.com/ppy/osu.git
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208 lines
5.8 KiB
C#
208 lines
5.8 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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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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namespace osu.Game.IO.Legacy
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{
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/// <summary> SerializationReader. Extends BinaryReader to add additional data types,
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/// handle null strings and simplify use with ISerializable. </summary>
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public class SerializationReader : BinaryReader
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{
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private readonly Stream stream;
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public SerializationReader(Stream s)
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: base(s, Encoding.UTF8)
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{
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stream = s;
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}
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public int RemainingBytes => (int)(stream.Length - stream.Position);
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/// <summary> Reads a string from the buffer. Overrides the base implementation so it can cope with nulls. </summary>
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public override string ReadString()
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{
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// ReSharper disable once AssignNullToNotNullAttribute
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if (ReadByte() == 0) return null;
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return base.ReadString();
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}
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/// <summary> Reads a byte array from the buffer, handling nulls and the array length. </summary>
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public byte[] ReadByteArray()
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{
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int len = ReadInt32();
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if (len > 0) return ReadBytes(len);
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if (len < 0) return null;
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return Array.Empty<byte>();
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}
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/// <summary> Reads a char array from the buffer, handling nulls and the array length. </summary>
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public char[] ReadCharArray()
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{
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int len = ReadInt32();
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if (len > 0) return ReadChars(len);
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if (len < 0) return null;
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return Array.Empty<char>();
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}
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/// <summary> Reads a DateTime from the buffer. </summary>
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public DateTime ReadDateTime()
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{
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long ticks = ReadInt64();
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if (ticks < 0) throw new IOException("Bad ticks count read!");
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return new DateTime(ticks, DateTimeKind.Utc);
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}
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/// <summary> Reads a generic list from the buffer. </summary>
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public IList<T> ReadBList<T>(bool skipErrors = false) where T : ILegacySerializable, new()
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{
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int count = ReadInt32();
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if (count < 0) return null;
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IList<T> d = new List<T>(count);
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SerializationReader sr = new SerializationReader(BaseStream);
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for (int i = 0; i < count; i++)
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{
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T obj = new T();
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try
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{
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obj.ReadFromStream(sr);
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}
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catch (Exception)
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{
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if (skipErrors)
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continue;
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throw;
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}
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d.Add(obj);
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}
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return d;
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}
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/// <summary> Reads a generic list from the buffer. </summary>
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public IList<T> ReadList<T>()
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{
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int count = ReadInt32();
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if (count < 0) return null;
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IList<T> d = new List<T>(count);
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for (int i = 0; i < count; i++) d.Add((T)ReadObject());
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return d;
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}
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/// <summary> Reads a generic Dictionary from the buffer. </summary>
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public IDictionary<TKey, TValue> ReadDictionary<TKey, TValue>()
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{
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int count = ReadInt32();
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if (count < 0) return null;
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IDictionary<TKey, TValue> d = new Dictionary<TKey, TValue>();
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for (int i = 0; i < count; i++) d[(TKey)ReadObject()] = (TValue)ReadObject();
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return d;
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}
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/// <summary> Reads an object which was added to the buffer by WriteObject. </summary>
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public object ReadObject()
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{
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ObjType t = (ObjType)ReadByte();
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switch (t)
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{
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case ObjType.boolType:
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return ReadBoolean();
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case ObjType.byteType:
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return ReadByte();
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case ObjType.uint16Type:
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return ReadUInt16();
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case ObjType.uint32Type:
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return ReadUInt32();
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case ObjType.uint64Type:
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return ReadUInt64();
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case ObjType.sbyteType:
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return ReadSByte();
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case ObjType.int16Type:
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return ReadInt16();
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case ObjType.int32Type:
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return ReadInt32();
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case ObjType.int64Type:
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return ReadInt64();
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case ObjType.charType:
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return ReadChar();
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case ObjType.stringType:
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return base.ReadString();
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case ObjType.singleType:
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return ReadSingle();
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case ObjType.doubleType:
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return ReadDouble();
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case ObjType.decimalType:
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return ReadDecimal();
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case ObjType.dateTimeType:
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return ReadDateTime();
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case ObjType.byteArrayType:
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return ReadByteArray();
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case ObjType.charArrayType:
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return ReadCharArray();
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case ObjType.otherType:
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throw new IOException("Deserialization of arbitrary type is not supported.");
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default:
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return null;
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}
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}
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}
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public enum ObjType : byte
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{
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nullType,
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boolType,
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byteType,
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uint16Type,
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uint32Type,
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uint64Type,
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sbyteType,
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int16Type,
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int32Type,
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int64Type,
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charType,
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stringType,
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singleType,
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doubleType,
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decimalType,
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dateTimeType,
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byteArrayType,
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charArrayType,
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otherType,
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ILegacySerializableType
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}
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}
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