tw22

Backup/22 3 komprese test.py

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+import subprocess
+import time
+from pathlib import Path
+import zipfile
+import zstandard as zstd
+
+# ============================================================
+# CONFIG
+# ============================================================
+
+SRC = Path(r"D:\medicusbackup\MEDICUS_2026-01-24_17-07-44.fbk")
+BASE = SRC.with_suffix("")
+CHUNK = 8 * 1024 * 1024  # 8 MB
+
+SEVENZIP_EXE = r"c:\Program Files (x86)\7-Zip\7z.exe"
+
+ORIG_SIZE = SRC.stat().st_size
+
+
+# ============================================================
+# ZIP (ZIP64 + progress)
+# ============================================================
+
+def zip_test():
+    dst = BASE.with_suffix(".zip")
+    total = ORIG_SIZE
+    processed = 0
+
+    start = time.time()
+
+    with zipfile.ZipFile(
+        dst,
+        "w",
+        compression=zipfile.ZIP_DEFLATED,
+        compresslevel=9,
+    ) as zf:
+
+        zi = zipfile.ZipInfo(SRC.name)
+        zi.compress_type = zipfile.ZIP_DEFLATED
+
+        # ⬇⬇⬇ KLÍČOVÁ OPRAVA ⬇⬇⬇
+        with zf.open(zi, "w", force_zip64=True) as z:
+            with open(SRC, "rb") as f:
+                while buf := f.read(CHUNK):
+                    z.write(buf)
+                    processed += len(buf)
+                    print(
+                        f"\rZIP   {processed*100/total:6.2f}%",
+                        end="",
+                        flush=True,
+                    )
+
+    print()
+    return time.time() - start, dst.stat().st_size
+
+
+# ============================================================
+# 7Z (CLI + progress)
+# ============================================================
+
+def sevenzip_test():
+    dst = BASE.with_suffix(".7z")
+
+    start = time.time()
+
+    proc = subprocess.Popen(
+        [SEVENZIP_EXE, "a", "-t7z", "-mx=9", str(dst), str(SRC)],
+        stdout=subprocess.PIPE,
+        stderr=subprocess.STDOUT,
+        text=True,
+    )
+
+    for line in proc.stdout:
+        if "%" in line:
+            print(f"\r7Z    {line.strip():>6}", end="", flush=True)
+
+    proc.wait()
+    print()
+
+    return time.time() - start, dst.stat().st_size
+
+
+# ============================================================
+# ZSTD (stream + progress)
+# ============================================================
+
+def zstd_test():
+    dst = BASE.with_suffix(".zst")
+    total = ORIG_SIZE
+    processed = 0
+
+    cctx = zstd.ZstdCompressor(level=19)
+    start = time.time()
+
+    with open(SRC, "rb") as src, open(dst, "wb") as out:
+        with cctx.stream_writer(out) as compressor:
+            while buf := src.read(CHUNK):
+                compressor.write(buf)
+                processed += len(buf)
+                print(
+                    f"\rZSTD  {processed*100/total:6.2f}%",
+                    end="",
+                    flush=True,
+                )
+
+    print()
+    return time.time() - start, dst.stat().st_size
+
+
+# ============================================================
+# MAIN
+# ============================================================
+
+results = {}
+
+print("\n--- ZIP ---")
+t, s = zip_test()
+results["ZIP"] = (t, s)
+
+# print("\n--- 7Z ---")
+# t, s = sevenzip_test()
+# results["7Z"] = (t, s)
+#
+# print("\n--- ZSTD ---")
+# t, s = zstd_test()
+# results["ZSTD"] = (t, s)
+
+
+# ============================================================
+# SUMMARY
+# ============================================================
+
+print("\n=== SUMMARY ===")
+for name, (t, size) in results.items():
+    ratio = 100 * (1 - size / ORIG_SIZE)
+    print(
+        f"{name:5s}: "
+        f"{t:7.1f} s   "
+        f"{size/1024/1024:8.1f} MB   "
+        f"(-{ratio:5.1f} %)"
+    )