51 lines
976 B
C#
51 lines
976 B
C#
using System;
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using System.IO;
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using System.Runtime.CompilerServices;
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namespace SpirV
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{
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internal sealed class Reader
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{
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public Reader(BinaryReader reader)
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{
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reader_ = reader;
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uint magicNumber = reader_.ReadUInt32();
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if (magicNumber == Meta.MagicNumber)
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{
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littleEndian_ = true;
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}
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else if (Reverse(magicNumber) == Meta.MagicNumber)
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{
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littleEndian_ = false;
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}
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else
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{
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throw new Exception("Invalid magic number");
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}
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}
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public uint ReadDWord()
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{
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if (littleEndian_)
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{
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return reader_.ReadUInt32 ();
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}
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else
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{
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return Reverse(reader_.ReadUInt32());
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}
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static uint Reverse(uint u)
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{
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return (u << 24) | (u & 0xFF00U) << 8 | (u >> 8) & 0xFF00U | (u >> 24);
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}
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public bool EndOfStream => reader_.BaseStream.Position == reader_.BaseStream.Length;
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private readonly BinaryReader reader_;
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private readonly bool littleEndian_;
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}
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}
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