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SFDUTF7 encoding parsing library

Project description

SFDUTF7 encoder/decoder library

FontForge's Spline Font Databases have a rather unusual encoding called "UTF-7", but which is incompatible with either the common meaning of this word or the IMAP meaning. It is instead its own encoding unrelated to either, which I have implemented for use in sfdnormalize and other projects.

Tests / source of truth

The ultimate source of truth for this library is the implementation as it appears in FontForge's sfd.c of SFDDumpUTF7Str and SFDReadUTF7Str.

The function utf7toutf8_copy has some involvment as well. There is no spec, if this library results in a string FontForge can decode transparently (not the same thing as "exactly the same string FontForge itself would produce"!) my implementation is right; if it doesn't then it's not, please open a bug! :-)

License

Copyright (c) 2014–2022

  • sfdnormalize: Fredrick R. Brennan (@ctrlcctrlv)
  • IMAPClient¹: Menno Finlay-Smits (@mjs), Carson Ip (GitHub @carsonip), Mathieu Agopian (@magopian), John Villalovos (@JohnVillalovos)

All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * 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.
    * Neither the name of Menno Smits nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 MENNO SMITS 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.

¹ The version of IMAPClient this is based on is 6e6ec34b0e71975134d9492add22361ce4beb2a0: https://github.com/mjs/imapclient/blob/6e6ec34b0e71975134d9492add22361ce4beb2a0/imapclient/imap_utf7.py.

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