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fix(#51): reset the cursor position of stream #89

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fix(#51): reset the cursor position of stream #89

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11 changes: 10 additions & 1 deletion filetype/utils.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,7 @@
# -*- coding: utf-8 -*-

from io import BufferedIOBase

# Python 2.7 workaround
try:
import pathlib
Expand Down Expand Up @@ -57,7 +59,14 @@ def get_bytes(obj):
TypeError: if obj is not a supported type.
"""
try:
obj = obj.read(_NUM_SIGNATURE_BYTES)
if isinstance(obj, BufferedIOBase):
start_position = obj.tell()
obj.seek(0)
buffered_obj = obj
obj = obj.read(_NUM_SIGNATURE_BYTES)
buffered_obj.seek(start_position)
else:
obj = obj.read(_NUM_SIGNATURE_BYTES)
except AttributeError:
# duck-typing as readable failed - we'll try the other options
pass
Expand Down