78 lines
2.1 KiB
C#
78 lines
2.1 KiB
C#
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using System;
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using System.IO;
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using System.Runtime.InteropServices;
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using System.Text;
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using Roblox.DataTypes;
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namespace Roblox.BinaryFormat
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{
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public class RobloxBinaryReader : BinaryReader
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{
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public RobloxBinaryReader(Stream stream) : base(stream) { }
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public T[] ReadInterwovenValues<T>(int count, Func<byte[], int, T> decode) where T : struct
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{
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int bufferSize = Marshal.SizeOf<T>();
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byte[] interwoven = ReadBytes(count * bufferSize);
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T[] values = new T[count];
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for (int i = 0; i < count; i++)
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{
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long unwind = 0;
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for (int weave = 0; weave < bufferSize; weave++)
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{
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long splice = interwoven[(weave * count) + i];
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int strand = (bufferSize - weave - 1) * 8;
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unwind |= (splice << strand);
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}
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byte[] buffer = BitConverter.GetBytes(unwind);
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values[i] = decode(buffer, 0);
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}
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return values;
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}
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public int[] ReadInts(int count)
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{
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return ReadInterwovenValues(count, (buffer, start) =>
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{
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int value = BitConverter.ToInt32(buffer, start);
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return (value >> 1) ^ (-(value & 1));
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});
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}
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public float[] ReadFloats(int count)
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{
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return ReadInterwovenValues(count, (buffer, start) =>
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{
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uint u = BitConverter.ToUInt32(buffer, start);
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uint i = (u >> 1) | (u << 31);
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byte[] b = BitConverter.GetBytes(i);
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return BitConverter.ToSingle(b, 0);
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});
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}
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public int[] ReadInstanceIds(int count)
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{
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int[] values = ReadInts(count);
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for (int i = 1; i < count; ++i)
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values[i] += values[i - 1];
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return values;
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}
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public override string ReadString()
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{
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int length = ReadInt32();
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byte[] buffer = ReadBytes(length);
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return Encoding.UTF8.GetString(buffer);
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}
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}
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}
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