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import os\r\nimport zstandard as zstd\r\n\r\ndef unpack_zst(input_file, output_file=None):\r\n    \"\"\"\r\n    Unpacks a .zst file using the Zstandard library.\r\n\r\n    Args:\r\n        input_file (str): Path to the input .zst file.\r\n        output_file (str): Path to the output file. If None, the output file \r\n                           will have the same name as the input file but without the .zst extension.\r\n\r\n    Returns:\r\n        str: Path to the decompressed file.\r\n    \"\"\"\r\n    if not input_file.endswith('.zst'):\r\n        raise ValueError(\"Input file must have a .zst extension\")\r\n\r\n    if output_file is None:\r\n        output_file = input_file.rsplit('.zst', 1)[0]\r\n\r\n    try:\r\n        with open(input_file, 'rb') as compressed_file:\r\n            dctx = zstd.ZstdDecompressor()\r\n            with open(output_file, 'wb') as decompressed_file:\r\n                dctx.copy_stream(compressed_file, decompressed_file)\r\n        print(f\"Decompressed '{input_file}' to '{output_file}'\")\r\n        return output_file\r\n    except Exception as e:\r\n        print(f\"Failed to decompress '{input_file}': {e}\")\r\n        raise\r\n\r\nif __name__ == \"__main__\":\r\n    import argparse\r\n\r\n    parser = argparse.ArgumentParser(description=\"Unpack a .zst file\")\r\n    parser.add_argument(\"input_file\", help=\"Path to the .zst file\")\r\n    parser.add_argument(\r\n        \"-o\", \"--output_file\", \r\n        help=\"Path to the output file (default: same name as input without .zst)\"\r\n    )\r\n    args = parser.parse_args()\r\n\r\n    try:\r\n        unpack_zst(args.input_file, args.output_file)\r\n    except Exception as e:\r\n        print(f\"Error: {e}\")

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