Added embed support.

Backend/Preview.py

@@ -2,6 +2,8 @@ from __future__ import annotations
 
 from pathlib import Path
 
+from fastapi.responses import StreamingResponse
+
 
 TextFileTypes = {"markdown", "text", "config", "html"}
 
@@ -40,3 +42,34 @@ def ParseRangeHeader(RangeHeader: str, FileSize: int) -> tuple[int, int]:
     End = min(End, FileSize - 1)
 
     return Start, End
+
+
+def StreamBinaryFile(FilePath: Path, RangeHeader: str | None) -> StreamingResponse:
+    FileSize = GetFileSize(FilePath)
+    MimeType = GetMimeType(FilePath)
+
+    if RangeHeader:
+        Start, End = ParseRangeHeader(RangeHeader, FileSize)
+        ChunkLength = End - Start + 1
+
+        def IterateChunk():
+            with FilePath.open("rb") as SourceFile:
+                SourceFile.seek(Start)
+                yield SourceFile.read(ChunkLength)
+
+        Headers = {
+            "Content-Range": f"bytes {Start}-{End}/{FileSize}",
+            "Accept-Ranges": "bytes",
+            "Content-Length": str(ChunkLength),
+        }
+        return StreamingResponse(
+            IterateChunk(), status_code=206, media_type=MimeType, headers=Headers
+        )
+
+    def IterateFile():
+        with FilePath.open("rb") as SourceFile:
+            while Chunk := SourceFile.read(1024 * 1024):
+                yield Chunk
+
+    Headers = {"Accept-Ranges": "bytes", "Content-Length": str(FileSize)}
+    return StreamingResponse(IterateFile(), media_type=MimeType, headers=Headers)