--- a/CMakeLists.txt	1970-01-01 03:00:00.000000000 +0300
+++ b/CMakeLists.txt	2018-04-11 15:19:34.000000000 +0300
@@ -0,0 +1,202 @@
+# Written in 2016-2017 by Henrik Steffen Gaßmann henrik@gassmann.onl
+#
+# To the extent possible under law, the author(s) have dedicated all
+# copyright and related and neighboring rights to this software to the
+# public domain worldwide. This software is distributed without any warranty.
+#
+# You should have received a copy of the CC0 Public Domain Dedication
+# along with this software. If not, see
+#
+#     http://creativecommons.org/publicdomain/zero/1.0/
+#
+########################################################################
+cmake_minimum_required(VERSION 3.1)
+
+project(base64 LANGUAGES C VERSION 0.3.0)
+
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules")
+
+#######################################################################
+# platform detection
+include(TargetArch)
+detect_target_architecture(_TARGET_ARCH)
+
+
+########################################################################
+# Compilation options
+option(BASE64_INSTALL_TARGET "add an install target" ON)
+option(BASE64_BUILD_TESTS "add test projects" ON)
+option(BASE64_WITH_OpenMP "use openmp" OFF)
+
+if (_TARGET_ARCH STREQUAL "x86" OR _TARGET_ARCH STREQUAL "x64")
+    option(BASE64_WITH_FAST_UNALIGNED_ACCESS "vectorization: unaligned access enabled" ON)
+    option(BASE64_WITH_SSSE3 "add SSSE 3 codepath" ON)
+    option(BASE64_WITH_SSE41 "add SSE 4.1 codepath" ON)
+    option(BASE64_WITH_SSE42 "add SSE 4.2 codepath" ON)
+    option(BASE64_WITH_AVX "add AVX codepath" ON)
+    option(BASE64_WITH_AVX2 "add AVX 2 codepath" ON)
+
+elseif (_TARGET_ARCH STREQUAL "arm")
+    option(BASE64_WITH_NEON32 "add NEON32 codepath" OFF)
+
+elseif (_TARGET_ARCH STREQUAL "arm64")
+    option(BASE64_WITH_NEON64 "add NEON64 codepath" ON)
+
+endif()
+
+###################################################################
+# OpenMP
+if(BASE64_WITH_OpenMP)
+    find_package(OpenMP)
+    if (OPENMP_FOUND)
+        option(BASE64_USE_OpenMP "Utilize OpenMP to parallelize encoding and decoding." ON)
+    endif()
+endif()
+
+########################################################################
+# library project
+add_library(base64 STATIC
+    # library files
+    lib/lib.c
+    lib/codec_choose.c
+    include/libbase64.h
+
+    # codec implementations
+    lib/arch/generic/codec.c
+
+    lib/arch/ssse3/codec.c
+    lib/arch/sse41/codec.c
+    lib/arch/sse42/codec.c
+    lib/arch/avx/codec.c
+    lib/arch/avx2/codec.c
+
+    lib/arch/neon32/codec.c
+    lib/arch/neon64/codec.c
+)
+
+if (NOT BASE64_STANDALONE_PROJECT)
+    # export inlucde path if base64 added as subdirectory
+    target_include_directories(base64 INTERFACE
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+    )
+endif()
+
+####################################################################
+# platform/compiler specific configuration
+set_target_properties(base64 PROPERTIES
+    C_STANDARD 99
+    C_STANDARD_REQUIRED YES
+    C_EXTENSIONS OFF
+)
+
+target_compile_options(base64 PRIVATE
+  $<$<C_COMPILER_ID:MSVC>:
+    /W4
+    /WX # All warnings as error
+    /we4013 # Error warning C4013: 'function' undefined; assuming extern returning int
+    /we4700 # Error warning C4700: uninitialized local variable
+    /we4715 # not all control paths return a value
+    /we4003 # not enough actual parameters for macro
+    /wd4456 # disable warning C4456: declaration of 'xxx' hides previous local declaration
+  >
+  $<$<NOT:$<C_COMPILER_ID:MSVC>>:
+    -Wall
+    -Wextra
+    -Wpedantic
+  >
+)
+
+target_compile_definitions(base64 PRIVATE
+  $<$<C_COMPILER_ID:MSVC>:
+    # remove unnecessary warnings about unchecked iterators
+    _SCL_SECURE_NO_WARNINGS
+  >
+)
+
+########################################################################
+# SIMD settings
+include(TargetSIMDInstructionSet)
+define_SIMD_compile_flags()
+
+if (_TARGET_ARCH STREQUAL "x86" OR _TARGET_ARCH STREQUAL "x64")
+    macro(configure_codec _TYPE)
+        if (BASE64_WITH_${_TYPE})
+            message(STATUS "Add codec: lib/arch/${_DIR}/codec.c")
+            string(TOLOWER "${_TYPE}" _DIR)
+            set_source_files_properties("lib/arch/${_DIR}/codec.c" PROPERTIES
+                COMPILE_FLAGS "${COMPILE_FLAGS_${_TYPE}}"
+            )
+
+            if (${ARGC} GREATER 1 AND MSVC)
+                set_source_files_properties("lib/arch/${_DIR}/codec.c" PROPERTIES
+                    COMPILE_DEFINITIONS ${ARGV1}
+                )
+            endif()
+        endif()
+    endmacro()
+
+    configure_codec(SSSE3 __SSSE3__)
+    configure_codec(SSE41 __SSSE4_1__)
+    configure_codec(SSE42 __SSSE4_2__)
+    configure_codec(AVX)
+    configure_codec(AVX2)
+
+elseif (_TARGET_ARCH STREQUAL "arm")
+    set(BASE64_NEON32_CFLAGS "${COMPILE_FLAGS_NEON32}" CACHE STRING "the NEON32 compile flags (for 'lib/arch/neon32/codec.c')")
+    mark_as_advanced(BASE64_NEON32_CFLAGS)
+
+    if (BASE64_WITH_NEON32)
+        set_source_files_properties("lib/arch/neon32/codec.c" PROPERTIES
+            COMPILE_FLAGS "${BASE64_NEON32_CFLAGS} "
+        )
+    endif()
+
+#elseif (_TARGET_ARCH STREQUAL "arm64" AND BASE64_WITH_NEON64)
+
+endif()
+
+configure_file("${CMAKE_CURRENT_LIST_DIR}/cmake/config.h.in" "${CMAKE_CURRENT_BINARY_DIR}/config.h" @ONLY)
+target_include_directories(base64 PRIVATE "${CMAKE_CURRENT_BINARY_DIR}")
+
+########################################################################
+# OpenMP Settings
+if (BASE64_USE_OpenMP)
+    target_compile_options(base64
+        PRIVATE
+            ${OpenMP_C_FLAGS}
+    )
+endif()
+
+########################################################################
+if (BASE64_BUILD_TESTS)
+    enable_testing()
+    add_subdirectory(test)
+endif()
+
+########################################################################
+# install target
+if (BASE64_INSTALL_TARGET)
+    install(TARGETS base64 EXPORT base64-targets
+        RUNTIME DESTINATION bin
+        LIBRARY DESTINATION lib
+        ARCHIVE DESTINATION lib
+        INCLUDES DESTINATION include
+    )
+    install(FILES include/libbase64.h DESTINATION include)
+
+    include(CMakePackageConfigHelpers)
+    write_basic_package_version_file(
+        "${CMAKE_CURRENT_BINARY_DIR}/base64-config-version.cmake"
+        VERSION ${BASE64_VERSION}
+        COMPATIBILITY ExactVersion
+    )
+    install(FILES "${CMAKE_CURRENT_BINARY_DIR}/base64-config-version.cmake" DESTINATION cmake)
+
+    configure_file(cmake/base64-config.cmake
+        "${CMAKE_CURRENT_BINARY_DIR}/base64-config.cmake"
+        COPYONLY
+    )
+    install(FILES "${CMAKE_CURRENT_BINARY_DIR}/base64-config.cmake" DESTINATION cmake)
+
+    install(EXPORT base64-targets DESTINATION cmake)
+endif()
--- a/cmake/base64-config.cmake	1970-01-01 03:00:00.000000000 +0300
+++ b/cmake/base64-config.cmake	2020-12-02 10:29:31.014613200 +0300
@@ -0,0 +1 @@
+include("${CMAKE_CURRENT_LIST_DIR}/base64-targets.cmake")
--- a/cmake/config.h.in	1970-01-01 03:00:00.000000000 +0300
+++ b/cmake/config.h.in	2018-04-11 15:19:34.000000000 +0300
@@ -0,0 +1,28 @@
+#ifndef BASE64_CONFIG_H
+#define BASE64_CONFIG_H
+
+#cmakedefine01 BASE64_WITH_SSSE3
+#define HAVE_SSSE3 BASE64_WITH_SSSE3
+
+#cmakedefine01 BASE64_WITH_SSE41
+#define HAVE_SSE41 BASE64_WITH_SSE41
+
+#cmakedefine01 BASE64_WITH_SSE42
+#define HAVE_SSE42 BASE64_WITH_SSE42
+
+#cmakedefine01 BASE64_WITH_AVX
+#define HAVE_AVX BASE64_WITH_AVX
+
+#cmakedefine01 BASE64_WITH_AVX2
+#define HAVE_AVX2 BASE64_WITH_AVX2
+
+#cmakedefine01 BASE64_WITH_NEON32
+#define HAVE_NEON32 BASE64_WITH_NEON32
+
+#cmakedefine01 BASE64_WITH_NEON64
+#define HAVE_NEON64 BASE64_WITH_NEON64
+
+#cmakedefine01 BASE64_WITH_FAST_UNALIGNED_ACCESS
+#define HAVE_FAST_UNALIGNED_ACCESS BASE64_WITH_FAST_UNALIGNED_ACCESS
+
+#endif // BASE64_CONFIG_H
--- a/cmake/Modules/TargetArch.cmake	1970-01-01 03:00:00.000000000 +0300
+++ b/cmake/Modules/TargetArch.cmake	2018-04-11 15:19:34.000000000 +0300
@@ -0,0 +1,29 @@
+# Written in 2017 by Henrik Steffen Gaßmann henrik@gassmann.onl
+#
+# To the extent possible under law, the author(s) have dedicated all
+# copyright and related and neighboring rights to this software to the
+# public domain worldwide. This software is distributed without any warranty.
+#
+# You should have received a copy of the CC0 Public Domain Dedication
+# along with this software. If not, see
+#
+#     http://creativecommons.org/publicdomain/zero/1.0/
+#
+########################################################################
+
+set(TARGET_ARCHITECTURE_TEST_FILE "${CMAKE_CURRENT_LIST_DIR}/../test-arch.c")
+
+function(detect_target_architecture OUTPUT_VARIABLE)
+    message(STATUS "${CMAKE_CURRENT_LIST_DIR}")
+    try_compile(_IGNORED "${CMAKE_CURRENT_BINARY_DIR}"
+        "${TARGET_ARCHITECTURE_TEST_FILE}"
+        OUTPUT_VARIABLE _LOG
+    )
+
+    string(REGEX MATCH "##arch=([^#]+)##" _IGNORED "${_LOG}")
+
+    set(${OUTPUT_VARIABLE} "${CMAKE_MATCH_1}" PARENT_SCOPE)
+    if (CMAKE_MATCH_1 STREQUAL "unknown")
+        message(WARNING "could not detect the target architecture.")
+    endif()
+endfunction()
--- a/cmake/Modules/TargetSIMDInstructionSet.cmake	1970-01-01 03:00:00.000000000 +0300
+++ b/cmake/Modules/TargetSIMDInstructionSet.cmake	2018-04-11 15:19:34.000000000 +0300
@@ -0,0 +1,34 @@
+# Written in 2016-2017 by Henrik Steffen Gaßmann henrik@gassmann.onl
+#
+# To the extent possible under law, the author(s) have dedicated all
+# copyright and related and neighboring rights to this software to the
+# public domain worldwide. This software is distributed without any warranty.
+#
+# You should have received a copy of the CC0 Public Domain Dedication
+# along with this software. If not, see
+#
+#     http://creativecommons.org/publicdomain/zero/1.0/
+#
+########################################################################
+
+########################################################################
+# compiler flags definition
+macro(define_SIMD_compile_flags)
+    if (CMAKE_C_COMPILER_ID STREQUAL "GNU" OR CMAKE_C_COMPILER_ID STREQUAL "Clang")
+        # x86
+        set(COMPILE_FLAGS_SSSE3 "-mssse3")
+        set(COMPILE_FLAGS_SSE41 "-msse4.1")
+        set(COMPILE_FLAGS_SSE42 "-msse4.2")
+        set(COMPILE_FLAGS_AVX "-mavx")
+        set(COMPILE_FLAGS_AVX2 "-mavx2")
+
+        #arm
+        set(COMPILE_FLAGS_NEON32 "-mfpu=neon")
+    elseif(MSVC)
+        set(COMPILE_FLAGS_SSSE3 " ")
+        set(COMPILE_FLAGS_SSE41 " ")
+        set(COMPILE_FLAGS_SSE42 " ")
+        set(COMPILE_FLAGS_AVX "/arch:AVX2")
+        set(COMPILE_FLAGS_AVX2 "/arch:AVX2")
+    endif()
+endmacro(define_SIMD_compile_flags)
--- a/cmake/test-arch.c	1970-01-01 03:00:00.000000000 +0300
+++ b/cmake/test-arch.c	2018-04-11 15:19:34.000000000 +0300
@@ -0,0 +1,35 @@
+// Written in 2017 by Henrik Steffen Gaßmann henrik@gassmann.onl
+//
+// To the extent possible under law, the author(s) have dedicated all
+// copyright and related and neighboring rights to this software to the
+// public domain worldwide. This software is distributed without any warranty.
+//
+// You should have received a copy of the CC0 Public Domain Dedication
+// along with this software. If not, see
+//
+//     http://creativecommons.org/publicdomain/zero/1.0/
+//
+////////////////////////////////////////////////////////////////////////////////
+
+// ARM 64-Bit
+#if defined(__aarch64__)
+#error ##arch=arm64##
+
+// ARM 32-Bit
+#elif defined(__arm__) \
+    || defined(_M_ARM)
+#error ##arch=arm##
+
+// x86 64-Bit
+#elif defined(__x86_64__) \
+    || defined(_M_X64)
+#error ##arch=x64##
+
+// x86 32-Bit
+#elif defined(__i386__) \
+    || defined(_M_IX86)
+#error ##arch=x86##
+
+#else
+#error ##arch=unknown##
+#endif
--- a/test/CMakeLists.txt	1970-01-01 03:00:00.000000000 +0300
+++ b/test/CMakeLists.txt	2020-12-01 13:59:57.970624200 +0300
@@ -0,0 +1,38 @@
+# Written in 2016 by Henrik Steffen Gaßmann henrik@gassmann.onl
+#
+# To the extent possible under law, the author(s) have dedicated all
+# copyright and related and neighboring rights to this software to the
+# public domain worldwide. This software is distributed without any warranty.
+#
+# You should have received a copy of the CC0 Public Domain Dedication
+# along with this software. If not, see
+#
+#     http://creativecommons.org/publicdomain/zero/1.0/
+#
+########################################################################
+cmake_minimum_required(VERSION 3.1)
+
+function(add_base64_test TEST_NAME)
+    unset(SRC_FILE)
+    foreach(SRC_FILE ${ARGN})
+        list(APPEND SRC_FILES "${SRC_FILE}")
+    endforeach()
+
+    add_executable(${TEST_NAME} ${SRC_FILES})
+    target_link_libraries(${TEST_NAME} base64)
+
+    add_test(NAME ${TEST_NAME}
+        COMMAND ${TEST_NAME}
+    )
+endfunction()
+
+
+add_base64_test(test_base64
+    codec_supported.c
+    test_base64.c
+)
+
+add_base64_test(benchmark
+    codec_supported.c
+    benchmark.c
+)