diff options
Diffstat (limited to 'Lib/compression/zstd/_zstdfile.py')
| -rw-r--r-- | Lib/compression/zstd/_zstdfile.py | 69 |
1 files changed, 34 insertions, 35 deletions
diff --git a/Lib/compression/zstd/_zstdfile.py b/Lib/compression/zstd/_zstdfile.py index 0086c13d3c1..d709f5efc65 100644 --- a/Lib/compression/zstd/_zstdfile.py +++ b/Lib/compression/zstd/_zstdfile.py @@ -1,10 +1,9 @@ import io from os import PathLike -from _zstd import (ZstdCompressor, ZstdDecompressor, ZstdError, - ZSTD_DStreamOutSize) +from _zstd import ZstdCompressor, ZstdDecompressor, ZSTD_DStreamOutSize from compression._common import _streams -__all__ = ("ZstdFile", "open") +__all__ = ('ZstdFile', 'open') _MODE_CLOSED = 0 _MODE_READ = 1 @@ -31,15 +30,15 @@ class ZstdFile(_streams.BaseStream): FLUSH_BLOCK = ZstdCompressor.FLUSH_BLOCK FLUSH_FRAME = ZstdCompressor.FLUSH_FRAME - def __init__(self, file, /, mode="r", *, + def __init__(self, file, /, mode='r', *, level=None, options=None, zstd_dict=None): """Open a Zstandard compressed file in binary mode. *file* can be either an file-like object, or a file name to open. - *mode* can be "r" for reading (default), "w" for (over)writing, "x" for - creating exclusively, or "a" for appending. These can equivalently be - given as "rb", "wb", "xb" and "ab" respectively. + *mode* can be 'r' for reading (default), 'w' for (over)writing, 'x' for + creating exclusively, or 'a' for appending. These can equivalently be + given as 'rb', 'wb', 'xb' and 'ab' respectively. *level* is an optional int specifying the compression level to use, or COMPRESSION_LEVEL_DEFAULT if not given. @@ -57,33 +56,33 @@ class ZstdFile(_streams.BaseStream): self._buffer = None if not isinstance(mode, str): - raise ValueError("mode must be a str") + raise ValueError('mode must be a str') if options is not None and not isinstance(options, dict): - raise TypeError("options must be a dict or None") - mode = mode.removesuffix("b") # handle rb, wb, xb, ab - if mode == "r": + raise TypeError('options must be a dict or None') + mode = mode.removesuffix('b') # handle rb, wb, xb, ab + if mode == 'r': if level is not None: - raise TypeError("level is illegal in read mode") + raise TypeError('level is illegal in read mode') self._mode = _MODE_READ - elif mode in {"w", "a", "x"}: + elif mode in {'w', 'a', 'x'}: if level is not None and not isinstance(level, int): - raise TypeError("level must be int or None") + raise TypeError('level must be int or None') self._mode = _MODE_WRITE self._compressor = ZstdCompressor(level=level, options=options, zstd_dict=zstd_dict) self._pos = 0 else: - raise ValueError(f"Invalid mode: {mode!r}") + raise ValueError(f'Invalid mode: {mode!r}') if isinstance(file, (str, bytes, PathLike)): self._fp = io.open(file, f'{mode}b') self._close_fp = True - elif ((mode == 'r' and hasattr(file, "read")) - or (mode != 'r' and hasattr(file, "write"))): + elif ((mode == 'r' and hasattr(file, 'read')) + or (mode != 'r' and hasattr(file, 'write'))): self._fp = file else: - raise TypeError("file must be a file-like object " - "or a str, bytes, or PathLike object") + raise TypeError('file must be a file-like object ' + 'or a str, bytes, or PathLike object') if self._mode == _MODE_READ: raw = _streams.DecompressReader( @@ -151,22 +150,22 @@ class ZstdFile(_streams.BaseStream): return self._check_not_closed() if mode not in {self.FLUSH_BLOCK, self.FLUSH_FRAME}: - raise ValueError("Invalid mode argument, expected either " - "ZstdFile.FLUSH_FRAME or " - "ZstdFile.FLUSH_BLOCK") + raise ValueError('Invalid mode argument, expected either ' + 'ZstdFile.FLUSH_FRAME or ' + 'ZstdFile.FLUSH_BLOCK') if self._compressor.last_mode == mode: return # Flush zstd block/frame, and write. data = self._compressor.flush(mode) self._fp.write(data) - if hasattr(self._fp, "flush"): + if hasattr(self._fp, 'flush'): self._fp.flush() def read(self, size=-1): """Read up to size uncompressed bytes from the file. If size is negative or omitted, read until EOF is reached. - Returns b"" if the file is already at EOF. + Returns b'' if the file is already at EOF. """ if size is None: size = -1 @@ -178,7 +177,7 @@ class ZstdFile(_streams.BaseStream): making multiple reads from the underlying stream. Reads up to a buffer's worth of data if size is negative. - Returns b"" if the file is at EOF. + Returns b'' if the file is at EOF. """ self._check_can_read() if size < 0: @@ -293,7 +292,7 @@ class ZstdFile(_streams.BaseStream): return self._mode == _MODE_WRITE -def open(file, /, mode="rb", *, level=None, options=None, zstd_dict=None, +def open(file, /, mode='rb', *, level=None, options=None, zstd_dict=None, encoding=None, errors=None, newline=None): """Open a Zstandard compressed file in binary or text mode. @@ -301,8 +300,8 @@ def open(file, /, mode="rb", *, level=None, options=None, zstd_dict=None, in which case the named file is opened, or it can be an existing file object to read from or write to. - The mode parameter can be "r", "rb" (default), "w", "wb", "x", "xb", "a", - "ab" for binary mode, or "rt", "wt", "xt", "at" for text mode. + The mode parameter can be 'r', 'rb' (default), 'w', 'wb', 'x', 'xb', 'a', + 'ab' for binary mode, or 'rt', 'wt', 'xt', 'at' for text mode. The level, options, and zstd_dict parameters specify the settings the same as ZstdFile. @@ -323,19 +322,19 @@ def open(file, /, mode="rb", *, level=None, options=None, zstd_dict=None, behavior, and line ending(s). """ - text_mode = "t" in mode - mode = mode.replace("t", "") + text_mode = 't' in mode + mode = mode.replace('t', '') if text_mode: - if "b" in mode: - raise ValueError(f"Invalid mode: {mode!r}") + if 'b' in mode: + raise ValueError(f'Invalid mode: {mode!r}') else: if encoding is not None: - raise ValueError("Argument 'encoding' not supported in binary mode") + raise ValueError('Argument "encoding" not supported in binary mode') if errors is not None: - raise ValueError("Argument 'errors' not supported in binary mode") + raise ValueError('Argument "errors" not supported in binary mode') if newline is not None: - raise ValueError("Argument 'newline' not supported in binary mode") + raise ValueError('Argument "newline" not supported in binary mode') binary_file = ZstdFile(file, mode, level=level, options=options, zstd_dict=zstd_dict) |