Add multiBundle support

including fake headers
2026-11-14 11:18:47 -05:00 · 2025-03-10 18:08:40 +03:00
parent db4eb30a27
commit bc0e32efec
8 changed files with 317 additions and 69 deletions
@@ -0,0 +1,92 @@
+using System.IO;
+
+namespace AssetStudio
+{
+    public class OffsetStream : Stream
+    {
+        private readonly Stream _baseStream;
+        private long _offset;
+
+        public override bool CanRead => _baseStream.CanRead;
+        public override bool CanSeek => _baseStream.CanSeek;
+        public override bool CanWrite => false;
+        public override long Length => _baseStream.Length - _offset;
+
+        public override long Position
+        {
+            get => _baseStream.Position - _offset;
+            set => Seek(value, SeekOrigin.Begin);
+        }
+
+        public long BasePosition => _baseStream.Position;
+
+        public long Offset
+        {
+            get => _offset;
+            set
+            {
+                if (value < 0 || value > _baseStream.Length)
+                {
+                    throw new IOException($"{nameof(Offset)} is out of stream bound");
+                }
+                _offset = value;
+                Seek(0, SeekOrigin.Begin);
+            }
+        }
+
+        public OffsetStream(FileReader reader)
+        {
+            _baseStream = reader.BaseStream;
+            Offset = reader.Position;
+        }
+
+        public override void Flush() { }
+
+        public override int Read(byte[] buffer, int offset, int count)
+        {
+            return _baseStream.Read(buffer, offset, count);
+        }
+
+        public override long Seek(long offset, SeekOrigin origin)
+        {
+            if (offset > _baseStream.Length)
+            {
+                throw new IOException("Unable to seek beyond stream bound");
+            }
+
+            switch (origin)
+            {
+                case SeekOrigin.Begin:
+                    _baseStream.Seek(offset + _offset, SeekOrigin.Begin);
+                    break;
+                case SeekOrigin.Current:
+                    _baseStream.Seek(offset + Position, SeekOrigin.Begin);
+                    break;
+                case SeekOrigin.End:
+                    _baseStream.Seek(offset + _baseStream.Length, SeekOrigin.Begin);
+                    break;
+            }
+            return Position;
+        }
+
+        public override void SetLength(long value)
+        {
+            throw new System.NotImplementedException();
+        }
+
+        public override void Write(byte[] buffer, int offset, int count)
+        {
+            throw new System.NotImplementedException();
+        }
+
+        protected override void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                _baseStream.Dispose();
+            }
+
+            base.Dispose(disposing);
+        }
+    }
+}