mirror of
https://github.com/SillyTavern/SillyTavern-Extras.git
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59 lines
1.8 KiB
Python
59 lines
1.8 KiB
Python
# Copyright (c) Facebook, Inc. and its affiliates.
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#
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# This source code is licensed under the MIT license found in the
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# LICENSE file in the root directory of this source tree.
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from enum import Enum
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class TextCompressionLevel(Enum):
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none = 0
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low = 1
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high = 2
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class TextCompressor(object):
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def __init__(
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self, level: TextCompressionLevel, max_input_byte_length: int = 2**16
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):
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self.level = level
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self.max_input_length = max_input_byte_length
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def compress(self, text: str) -> bytes:
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if self.level == TextCompressionLevel.low:
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import zlib
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# zlib: built-in, fast
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return zlib.compress(text.encode(), level=0)
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elif self.level == TextCompressionLevel.high:
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try:
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import unishox2
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# unishox2: optimized for short text but slower
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except ImportError:
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raise ImportError(
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"Please install unishox2 for the text compression feature: "
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"pip install unishox2-py3"
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)
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assert len(text.encode()) <= self.max_input_length
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return unishox2.compress(text)[0]
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else:
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return text.encode()
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def decompress(self, compressed: bytes) -> str:
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if self.level == TextCompressionLevel.low:
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import zlib
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return zlib.decompress(compressed).decode()
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elif self.level == TextCompressionLevel.high:
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try:
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import unishox2
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except ImportError:
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raise ImportError(
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"Please install unishox2 for the text compression feature: "
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"pip install unishox2-py3"
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)
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return unishox2.decompress(compressed, self.max_input_length)
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else:
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return compressed.decode()
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