feat: change record file export to use LZMA

src/record_file.py

@@ -1,3 +1,4 @@
+import lzma
 from pathlib import Path
 import struct
 import time
@@ -12,7 +13,7 @@ class RecordFile:
     def __init__(self, path: str | Path, mode: Literal["w", "r"]) -> None:
         self.path: str | Path = path
         self.mode: Literal["w", "r"] = mode
-        self.file = open(self.path, self.mode + "b")
+        self.file: lzma.LZMAFile = lzma.LZMAFile(self.path, self.mode)
 
     def __enter__(self):
         return self
@@ -21,8 +22,7 @@ class RecordFile:
         self.file.close()
 
     def write_header(self, n_snapshots: int):
-        data: bytes = struct.pack(
+        data: bytes = struct.pack(">IId", self.VERSION, n_snapshots, time.time())
-            ">IId", self.VERSION, n_snapshots, time.time())
         self.file.write(data)
 
     def write_snapshots(self, snapshots: list[Snapshot]):
@@ -35,7 +35,8 @@ class RecordFile:
         version: int = struct.unpack(">I", self.file.read(4))[0]
         if version != self.VERSION:
             raise ValueError(
-                f"Cannot parse record file with format version {version} (current version: {self.VERSION})")
+                f"Cannot parse record file with format version {version} (current version: {self.VERSION})"
+            )
 
         n_snapshots: int
         timestamp: float

src/recorder.py

@@ -243,7 +243,7 @@ class RecorderWindow(Ui_Recorder, QMainWindow):
 
         self.SAVE_DIR.mkdir(exist_ok=True)
 
-        record_name: str = "record_%d.rec"
+        record_name: str = "record_%d.rec.xz"
         fid = 0
         while os.path.exists(self.SAVE_DIR / (record_name % fid)):
             fid += 1