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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| # Copyright (c) Meta Platforms, Inc. and affiliates. | ||
| # All rights reserved. | ||
| # | ||
| # This source code is licensed under the BSD-style license found in the | ||
| # LICENSE file in the root directory of this source tree. | ||
|
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| from collections.abc import Mapping | ||
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| import spdl.lib._zip as _zip | ||
| from numpy.lib import format as np_format | ||
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| __all__ = [ | ||
| "NpzFile", | ||
| "load_npz", | ||
| ] | ||
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| class ZipFile: | ||
| def __init__(self, handle): | ||
| self._handle = handle | ||
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| def read(self, n: int) -> bytes: | ||
| buffer = bytes(bytearray(n)) | ||
| num_read = self._handle.read(buffer) | ||
| return buffer[:num_read] | ||
|
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| def __enter__(self): | ||
| return self | ||
|
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| def __exit__(self, exc_type, exc_value, traceback): | ||
| self.close() | ||
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| def __getattr__(self, name: str): | ||
| if hasattr(self._handle, name): | ||
| return getattr(self._handle, name) | ||
| raise AttributeError(f"{name} not found") | ||
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| class ZipArchive: | ||
| def __init__(self, handle, data: bytes): | ||
| self._handle = handle | ||
| self._data = data # to keep the reference while the handle is alive | ||
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| def __getattr__(self, name: str): | ||
| if hasattr(self._handle, name): | ||
| return getattr(self._handle, name) | ||
| raise AttributeError(f"{name} not found") | ||
|
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| def open(self, name: str): | ||
| return ZipFile(self._handle.open(name)) | ||
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| def read(self, name: str): | ||
| with self.open(name) as file: | ||
| return file.read() | ||
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| def zip_archive(data: bytes) -> ZipArchive: | ||
| handle = _zip.zip_archive(data) | ||
| return ZipArchive(handle, data) | ||
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| class NpzFile(Mapping): | ||
| """NpzFile() | ||
| A class mimic the behavior of :py:class:`numpy.lib.npyio.NpzFile`. | ||
| Use :py:func:`load_npz` to create an instance of this class. | ||
| """ | ||
|
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| def __init__(self, archive): | ||
| self._archive = archive | ||
| self._files = self._archive.namelist() | ||
| self.files = [f.removesuffix(".npy") for f in self._files] | ||
|
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| def __enter__(self): | ||
| return self | ||
|
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| def __exit__(self, exc_type, exc_value, traceback): | ||
| self.close() | ||
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| def close(self): | ||
| self._archive.close() | ||
|
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| def __iter__(self): | ||
| return iter(self.files) | ||
|
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| def __len__(self): | ||
| return len(self.files) | ||
|
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| def __getitem__(self, key): | ||
| if key in self._files: | ||
| pass | ||
| elif key in self.files: | ||
| key = f"{key}.npy" | ||
| else: | ||
| raise KeyError(f"{key} is not a file in the archive") | ||
|
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| with self._archive.open(key) as file: | ||
| return np_format.read_array(file) | ||
|
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| def __contains__(self, key): | ||
| return key in self._files or key in self.files | ||
|
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| def __repr__(self): | ||
| return f"NpzFile object with {len(self)} entries." | ||
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| def load_npz(data: bytes) -> NpzFile: | ||
| """Load a numpy archive file (``npz``). | ||
| It is almost a drop-in replacement for :py:func:`numpy.load` function, | ||
| but it only supports the basic use cases. | ||
| This function uses the C++ implementation of the zip archive reader, which | ||
| releases the GIL. So it is more efficient than the official NumPy implementation | ||
| for supported cases. | ||
| Args: | ||
| data: The data to load. | ||
| Example | ||
| >>> x = np.arange(10) | ||
| >>> y = np.sin(x) | ||
| >>> | ||
| >>> with tempfile.TemporaryFile() as f: | ||
| ... np.savez(f, x=x, y=y) | ||
| ... f.seek(0) | ||
| ... data = spdl.io.load_npz(f.read()) | ||
| ... | ||
| >>> assert np.array_equal(data["x"], x) | ||
| >>> assert np.array_equal(data["y"], y) | ||
| """ | ||
| return NpzFile(zip_archive(data)) |
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