1 files changed, 148 insertions, 0 deletions
diff --git a/NW4RTools/InputStream.cs b/NW4RTools/InputStream.cs
new file mode 100644
index 0000000..3a776b4
--- /dev/null
+++ b/NW4RTools/InputStream.cs
@@ -0,0 +1,148 @@
+using System;
+using System.IO;
+
+namespace NW4RTools {
+	public class InputStream {
+		public readonly byte[] Data;
+		public readonly ByteEndian Endian;
+		private readonly bool MustReverseArrays;
+
+		public int Position {
+			get; private set;
+		}
+
+		public InputStream(byte[] data) {
+			Data = data;
+			Endian = ByteEndian.BigEndian;
+			Position = 0;
+			MustReverseArrays = BitConverter.IsLittleEndian;
+		}
+
+		public InputStream(byte[] data, ByteEndian endian) {
+			Data = data;
+			Endian = endian;
+			Position = 0;
+
+			if (Endian == ByteEndian.BigEndian)
+				MustReverseArrays = BitConverter.IsLittleEndian;
+			else
+				MustReverseArrays = !BitConverter.IsLittleEndian;
+		}
+
+		public void Seek(int pos) {
+			if (pos < 0 || pos >= Data.Length)
+				throw new ArgumentOutOfRangeException();
+
+			Position = pos;
+		}
+
+		public void Skip(int count) {
+			Seek(Position + count);
+		}
+
+		public byte[] ReadBytes(int count) {
+			byte[] ret = new byte[count];
+			Array.Copy(Data, Position, ret, 0, count);
+			Skip(count);
+			return ret;
+		}
+
+		private byte[] ReadReversedBytes(int count) {
+			byte[] buf = ReadBytes(count);
+			if (MustReverseArrays)
+				Array.Reverse(buf);
+			return buf;
+		}
+
+		public byte ReadByte() {
+			byte ret = Data[Position];
+			Skip(1);
+			return ret;
+		}
+
+		public Int16 ReadInt16() {
+			return BitConverter.ToInt16(ReadReversedBytes(2), 0);
+		}
+
+		public UInt16 ReadUInt16() {
+			return BitConverter.ToUInt16(ReadReversedBytes(2), 0);
+		}
+
+		public Int32 ReadInt32() {
+			return BitConverter.ToInt32(ReadReversedBytes(4), 0);
+		}
+
+		public UInt32 ReadUInt32() {
+			return BitConverter.ToUInt32(ReadReversedBytes(4), 0);
+		}
+
+		public float ReadFloat() {
+			return BitConverter.ToSingle(ReadReversedBytes(4), 0);
+		}
+
+		public double ReadDouble() {
+			return BitConverter.ToDouble(ReadReversedBytes(8), 0);
+		}
+
+		public Color ReadColor() {
+			var ret = new Color();
+			ret.r = Data[Position];
+			ret.g = Data[Position + 1];
+			ret.b = Data[Position + 2];
+			ret.a = Data[Position + 3];
+			Skip(4);
+			return ret;
+		}
+
+		public Vec2 ReadVec2() {
+			float x = ReadFloat();
+			float y = ReadFloat();
+			return new Vec2 { x = x, y = y };
+		}
+
+		public Vec3 ReadVec3() {
+			float x = ReadFloat();
+			float y = ReadFloat();
+			float z = ReadFloat();
+			return new Vec3 { x = x, y = y, z = z };
+		}
+
+		public Matrix ReadMatrix() {
+			var ret = new Matrix();
+			ret.v00 = ReadFloat();
+			ret.v01 = ReadFloat();
+			ret.v02 = ReadFloat();
+			ret.v03 = ReadFloat();
+			ret.v10 = ReadFloat();
+			ret.v11 = ReadFloat();
+			ret.v12 = ReadFloat();
+			ret.v13 = ReadFloat();
+			ret.v20 = ReadFloat();
+			ret.v21 = ReadFloat();
+			ret.v22 = ReadFloat();
+			ret.v23 = ReadFloat();
+			return ret;
+		}
+
+		public string ReadName() {
+			int length = ReadInt32();
+			string name = System.Text.Encoding.GetEncoding("Shift_JIS").GetString(ReadBytes(length));
+			if ((length & 3) != 0) {
+				Skip(4 - (length & 3));
+			}
+			return name;
+		}
+
+
+		public InputStream At(int pos) {
+			var ret = new InputStream(Data, Endian);
+			ret.Seek(pos);
+			return ret;
+		}
+
+		public InputStream Copy() {
+			return At(Position);
+		}
+	}
+}
+