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updated code to use a much faster algorithm found on NI Forums.
Adapted LIcense to mention reference to this code which is automatically released under MIT License as it was posted on NI Forums without a license.
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LICENSE

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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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https://opensource.org/licenses/0BSD
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***************
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Contains code distributed on NI Forums which default to MIT License
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(user "InfiniteNothing".)
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https://forums.ni.com/t5/Example-Code/Fast-Base64-Encoder-Decoder-using-LabVIEW/tac-p/3503284/highlight/true#M6526
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Credit to: InfiniteNothing (NI Forums user id: https://forums.ni.com/t5/user/viewprofilepage/user-id/72280 )
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Copyright (c) 2014 InfiniteNothing
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Serializer Base64.lvproj

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<Property Name="server.vi.callsEnabled" Type="Bool">true</Property>
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<Property Name="server.vi.propertiesEnabled" Type="Bool">true</Property>
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<Property Name="specify.custom.address" Type="Bool">false</Property>
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<Item Name="Tests" Type="Folder">
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<Item Name="Benchmark 800kB Input.vi" Type="VI" URL="../unit tests/Benchmark 800kB Input.vi"/>
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<Item Name="Test Base64 Encoder and Decoder.vi" Type="VI" URL="../unit tests/Test Base64 Encoder and Decoder.vi"/>
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</Item>
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<Item Name="Serializer.Base64.lvclass" Type="LVClass" URL="../source/Serializer.Base64.lvclass"/>
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<Item Name="Test Base64 Encoder and Decoder.vi" Type="VI" URL="../unit tests/Test Base64 Encoder and Decoder.vi"/>
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<Item Name="Dependencies" Type="Dependencies">
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<Item Name="vi.lib" Type="Folder">
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<Item Name="Clear Errors.vi" Type="VI" URL="/&lt;vilib&gt;/Utility/error.llb/Clear Errors.vi"/>

Serializer Base64.vipb

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<VI_Package_Builder_Settings Version="2018" Created_Date="2019-04-01 18:34:00" Modified_Date="2020-10-26 20:34:30" Creator="normandinf" Comments="" ID="77869bea1877720210040d3ac62bc84f">
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<Library_General_Settings>
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<Package_File_Name>LabVIEW_Open_Source_Project_lib_Serializer_Base64</Package_File_Name>
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<Library_Version>1.0.0.3</Library_Version>
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<Library_Version>1.0.1.4</Library_Version>
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<Library_Output_Folder>.</Library_Output_Folder>
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<Library_Summary/>
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<Library_License>0-BSD</Library_License>
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<Library_License>0-BSD and MIT</Library_License>
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<Package_LabVIEW_Version>13.0</Package_LabVIEW_Version>
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<Packager/>
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<URL>https://github.com/LabVIEW-Open-Source/Serializer.Base64</URL>
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<Release_Notes>- Initial Release of Serializer.Base64 extension for the OpenSerializer classes
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- Provides fast encode and decode for Base64 strings</Release_Notes>
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- Provides fast encode and decode for Base64 strings
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Implementing a version of the fast decode and encode found on NI Forums under MIT License:
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https://forums.ni.com/t5/Example-Code/Fast-Base64-Encoder-Decoder-using-LabVIEW/tac-p/3503284/highlight/true#M6526
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</Release_Notes>
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</Description>
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<Destinations>
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<Toolkit_VIs>
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<Path>source\Base64_CharSet.vi</Path>
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<VI_Title/>
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</Items_Data>
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<GUID>05A8BA648950A4B78FDA63FE67BC5847</GUID>
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<GUID>24BCE37B87C0EBECFD4C4308C3796158</GUID>
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</Functions_Palette_Data>
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</Library_Palette_Definition>
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</VI_Package_Builder_Settings>

Serializer Base64.vipc

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source/Base64_ByteLUT.vi

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source/Base64_CharSet.vi

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source/Base64_Decode.vi

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source/Base64_Encode.vi

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