| # Copyright (C) 2019 Apple Inc. All rights reserved. |
| # |
| # Redistribution and use in source and binary forms, with or without |
| # modification, are permitted provided that the following conditions |
| # are met: |
| # 1. Redistributions of source code must retain the above copyright |
| # notice, this list of conditions and the following disclaimer. |
| # 2. Redistributions in binary form must reproduce the above copyright |
| # notice, this list of conditions and the following disclaimer in the |
| # documentation and/or other materials provided with the distribution. |
| # |
| # THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND |
| # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| # DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR |
| # ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| # SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| import io |
| import sys |
| |
| |
| BytesIO = io.BytesIO |
| if sys.version_info > (3, 0): |
| StringIO = io.StringIO |
| else: |
| from StringIO import StringIO |
| UnicodeIO = io.StringIO |
| |
| unicode = str if sys.version_info > (3, 0) else unicode |
| |
| |
| def encode_if_necessary(value, encoding='utf-8', errors='strict'): |
| # In Python 3, string types must be encoded |
| if type(value) == unicode: |
| return value.encode(encoding, errors=errors) |
| return value |
| |
| |
| def encode_for(value, target_type, **kwargs): |
| if target_type == bytes: |
| return encode_if_necessary(value, **kwargs) |
| |
| if sys.version_info < (3, 0) and target_type == str: |
| return encode_if_necessary(value, **kwargs) |
| return value |
| |
| |
| def decode_if_necessary(value, encoding='utf-8', errors='strict'): |
| # In Python 2, string types might need to be decoded |
| if type(value) == bytes: |
| return value.decode(encoding, errors=errors) |
| return value |
| |
| |
| def decode_for(value, target_type): |
| if value is None: |
| return None |
| if type(value) == target_type: |
| return value |
| if target_type == unicode: |
| return decode_if_necessary(bytes(value)) |
| return value |
