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open-story-teller/shared/base64.hpp
anthony@rabine.fr 157c5a5a01 usage of submodules instead of git fetch 
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2025-01-28 22:31:05 +01:00

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#ifndef BASE64_HPP_
#define BASE64_HPP_
#include <algorithm>
#include <array>
#include <cassert>
#include <cstdint>
#include <cstring>
#include <stdexcept>
#include <string>
#include <string_view>
#if defined(__cpp_lib_bit_cast)
#include <bit> // For std::bit_cast.
#endif
namespace base64 {
namespace detail {
#if defined(__cpp_lib_bit_cast)
using std::bit_cast;
#else
template <class To, class From>
std::enable_if_t<sizeof(To) == sizeof(From) &&
std::is_trivially_copyable_v<From> &&
std::is_trivially_copyable_v<To>,
To>
bit_cast(const From& src) noexcept {
static_assert(std::is_trivially_constructible_v<To>,
"This implementation additionally requires "
"destination type to be trivially constructible");
To dst;
std::memcpy(&dst, &src, sizeof(To));
return dst;
}
#endif
inline constexpr char padding_char{'='};
inline constexpr uint32_t bad_char{0x01FFFFFF};
#if !defined(__LITTLE_ENDIAN__) && !defined(__BIG_ENDIAN__)
#if (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) || \
(defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN) || \
(defined(_BYTE_ORDER) && _BYTE_ORDER == _BIG_ENDIAN) || \
(defined(BYTE_ORDER) && BYTE_ORDER == BIG_ENDIAN) || \
(defined(__sun) && defined(__SVR4) && defined(_BIG_ENDIAN)) || \
defined(__ARMEB__) || defined(__THUMBEB__) || defined(__AARCH64EB__) || \
defined(_MIBSEB) || defined(__MIBSEB) || defined(__MIBSEB__) || \
defined(_M_PPC)
#define __BIG_ENDIAN__
#elif (defined(__BYTE_ORDER__) && \
__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) || /* gcc */ \
(defined(__BYTE_ORDER) && \
__BYTE_ORDER == __LITTLE_ENDIAN) /* linux header */ \
|| (defined(_BYTE_ORDER) && _BYTE_ORDER == _LITTLE_ENDIAN) || \
(defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN) /* mingw header */ || \
(defined(__sun) && defined(__SVR4) && \
defined(_LITTLE_ENDIAN)) || /* solaris */ \
defined(__ARMEL__) || \
defined(__THUMBEL__) || defined(__AARCH64EL__) || defined(_MIPSEL) || \
defined(__MIPSEL) || defined(__MIPSEL__) || defined(_M_IX86) || \
defined(_M_X64) || defined(_M_IA64) || /* msvc for intel processors */ \
defined(_M_ARM) /* msvc code on arm executes in little endian mode */
#define __LITTLE_ENDIAN__
#endif
#endif
#if !defined(__LITTLE_ENDIAN__) & !defined(__BIG_ENDIAN__)
#error "UNKNOWN Platform / endianness. Configure endianness explicitly."
#endif
#if defined(__LITTLE_ENDIAN__)
std::array<std::uint32_t, 256> constexpr decode_table_0 = {
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x000000f8, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x000000fc,
0x000000d0, 0x000000d4, 0x000000d8, 0x000000dc, 0x000000e0, 0x000000e4,
0x000000e8, 0x000000ec, 0x000000f0, 0x000000f4, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x00000000,
0x00000004, 0x00000008, 0x0000000c, 0x00000010, 0x00000014, 0x00000018,
0x0000001c, 0x00000020, 0x00000024, 0x00000028, 0x0000002c, 0x00000030,
0x00000034, 0x00000038, 0x0000003c, 0x00000040, 0x00000044, 0x00000048,
0x0000004c, 0x00000050, 0x00000054, 0x00000058, 0x0000005c, 0x00000060,
0x00000064, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x00000068, 0x0000006c, 0x00000070, 0x00000074, 0x00000078,
0x0000007c, 0x00000080, 0x00000084, 0x00000088, 0x0000008c, 0x00000090,
0x00000094, 0x00000098, 0x0000009c, 0x000000a0, 0x000000a4, 0x000000a8,
0x000000ac, 0x000000b0, 0x000000b4, 0x000000b8, 0x000000bc, 0x000000c0,
0x000000c4, 0x000000c8, 0x000000cc, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff};
std::array<std::uint32_t, 256> constexpr decode_table_1 = {
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x0000e003, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x0000f003,
0x00004003, 0x00005003, 0x00006003, 0x00007003, 0x00008003, 0x00009003,
0x0000a003, 0x0000b003, 0x0000c003, 0x0000d003, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x00000000,
0x00001000, 0x00002000, 0x00003000, 0x00004000, 0x00005000, 0x00006000,
0x00007000, 0x00008000, 0x00009000, 0x0000a000, 0x0000b000, 0x0000c000,
0x0000d000, 0x0000e000, 0x0000f000, 0x00000001, 0x00001001, 0x00002001,
0x00003001, 0x00004001, 0x00005001, 0x00006001, 0x00007001, 0x00008001,
0x00009001, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x0000a001, 0x0000b001, 0x0000c001, 0x0000d001, 0x0000e001,
0x0000f001, 0x00000002, 0x00001002, 0x00002002, 0x00003002, 0x00004002,
0x00005002, 0x00006002, 0x00007002, 0x00008002, 0x00009002, 0x0000a002,
0x0000b002, 0x0000c002, 0x0000d002, 0x0000e002, 0x0000f002, 0x00000003,
0x00001003, 0x00002003, 0x00003003, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff};
std::array<std::uint32_t, 256> constexpr decode_table_2 = {
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x00800f00, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x00c00f00,
0x00000d00, 0x00400d00, 0x00800d00, 0x00c00d00, 0x00000e00, 0x00400e00,
0x00800e00, 0x00c00e00, 0x00000f00, 0x00400f00, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x00000000,
0x00400000, 0x00800000, 0x00c00000, 0x00000100, 0x00400100, 0x00800100,
0x00c00100, 0x00000200, 0x00400200, 0x00800200, 0x00c00200, 0x00000300,
0x00400300, 0x00800300, 0x00c00300, 0x00000400, 0x00400400, 0x00800400,
0x00c00400, 0x00000500, 0x00400500, 0x00800500, 0x00c00500, 0x00000600,
0x00400600, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x00800600, 0x00c00600, 0x00000700, 0x00400700, 0x00800700,
0x00c00700, 0x00000800, 0x00400800, 0x00800800, 0x00c00800, 0x00000900,
0x00400900, 0x00800900, 0x00c00900, 0x00000a00, 0x00400a00, 0x00800a00,
0x00c00a00, 0x00000b00, 0x00400b00, 0x00800b00, 0x00c00b00, 0x00000c00,
0x00400c00, 0x00800c00, 0x00c00c00, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff};
std::array<std::uint32_t, 256> constexpr decode_table_3 = {
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x003e0000, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x003f0000,
0x00340000, 0x00350000, 0x00360000, 0x00370000, 0x00380000, 0x00390000,
0x003a0000, 0x003b0000, 0x003c0000, 0x003d0000, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x00000000,
0x00010000, 0x00020000, 0x00030000, 0x00040000, 0x00050000, 0x00060000,
0x00070000, 0x00080000, 0x00090000, 0x000a0000, 0x000b0000, 0x000c0000,
0x000d0000, 0x000e0000, 0x000f0000, 0x00100000, 0x00110000, 0x00120000,
0x00130000, 0x00140000, 0x00150000, 0x00160000, 0x00170000, 0x00180000,
0x00190000, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x001a0000, 0x001b0000, 0x001c0000, 0x001d0000, 0x001e0000,
0x001f0000, 0x00200000, 0x00210000, 0x00220000, 0x00230000, 0x00240000,
0x00250000, 0x00260000, 0x00270000, 0x00280000, 0x00290000, 0x002a0000,
0x002b0000, 0x002c0000, 0x002d0000, 0x002e0000, 0x002f0000, 0x00300000,
0x00310000, 0x00320000, 0x00330000, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff};
// TODO fix decoding tables to avoid the need for different indices in big
// endian?
inline constexpr size_t decidx0{0};
inline constexpr size_t decidx1{1};
inline constexpr size_t decidx2{2};
#elif defined(__BIG_ENDIAN__)
std::array<std::uint32_t, 256> constexpr decode_table_0 = {
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x00f80000, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x00fc0000,
0x00d00000, 0x00d40000, 0x00d80000, 0x00dc0000, 0x00e00000, 0x00e40000,
0x00e80000, 0x00ec0000, 0x00f00000, 0x00f40000, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x00000000,
0x00040000, 0x00080000, 0x000c0000, 0x00100000, 0x00140000, 0x00180000,
0x001c0000, 0x00200000, 0x00240000, 0x00280000, 0x002c0000, 0x00300000,
0x00340000, 0x00380000, 0x003c0000, 0x00400000, 0x00440000, 0x00480000,
0x004c0000, 0x00500000, 0x00540000, 0x00580000, 0x005c0000, 0x00600000,
0x00640000, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x00680000, 0x006c0000, 0x00700000, 0x00740000, 0x00780000,
0x007c0000, 0x00800000, 0x00840000, 0x00880000, 0x008c0000, 0x00900000,
0x00940000, 0x00980000, 0x009c0000, 0x00a00000, 0x00a40000, 0x00a80000,
0x00ac0000, 0x00b00000, 0x00b40000, 0x00b80000, 0x00bc0000, 0x00c00000,
0x00c40000, 0x00c80000, 0x00cc0000, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff};
std::array<std::uint32_t, 256> constexpr decode_table_1 = {
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x0003e000, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x0003f000,
0x00034000, 0x00035000, 0x00036000, 0x00037000, 0x00038000, 0x00039000,
0x0003a000, 0x0003b000, 0x0003c000, 0x0003d000, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x00000000,
0x00001000, 0x00002000, 0x00003000, 0x00004000, 0x00005000, 0x00006000,
0x00007000, 0x00008000, 0x00009000, 0x0000a000, 0x0000b000, 0x0000c000,
0x0000d000, 0x0000e000, 0x0000f000, 0x00010000, 0x00011000, 0x00012000,
0x00013000, 0x00014000, 0x00015000, 0x00016000, 0x00017000, 0x00018000,
0x00019000, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x0001a000, 0x0001b000, 0x0001c000, 0x0001d000, 0x0001e000,
0x0001f000, 0x00020000, 0x00021000, 0x00022000, 0x00023000, 0x00024000,
0x00025000, 0x00026000, 0x00027000, 0x00028000, 0x00029000, 0x0002a000,
0x0002b000, 0x0002c000, 0x0002d000, 0x0002e000, 0x0002f000, 0x00030000,
0x00031000, 0x00032000, 0x00033000, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff};
std::array<std::uint32_t, 256> constexpr decode_table_2 = {
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x00000f80, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x00000fc0,
0x00000d00, 0x00000d40, 0x00000d80, 0x00000dc0, 0x00000e00, 0x00000e40,
0x00000e80, 0x00000ec0, 0x00000f00, 0x00000f40, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x00000000,
0x00000040, 0x00000080, 0x000000c0, 0x00000100, 0x00000140, 0x00000180,
0x000001c0, 0x00000200, 0x00000240, 0x00000280, 0x000002c0, 0x00000300,
0x00000340, 0x00000380, 0x000003c0, 0x00000400, 0x00000440, 0x00000480,
0x000004c0, 0x00000500, 0x00000540, 0x00000580, 0x000005c0, 0x00000600,
0x00000640, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x00000680, 0x000006c0, 0x00000700, 0x00000740, 0x00000780,
0x000007c0, 0x00000800, 0x00000840, 0x00000880, 0x000008c0, 0x00000900,
0x00000940, 0x00000980, 0x000009c0, 0x00000a00, 0x00000a40, 0x00000a80,
0x00000ac0, 0x00000b00, 0x00000b40, 0x00000b80, 0x00000bc0, 0x00000c00,
0x00000c40, 0x00000c80, 0x00000cc0, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff};
std::array<std::uint32_t, 256> constexpr decode_table_3 = {
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x0000003e, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x0000003f,
0x00000034, 0x00000035, 0x00000036, 0x00000037, 0x00000038, 0x00000039,
0x0000003a, 0x0000003b, 0x0000003c, 0x0000003d, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x00000000,
0x00000001, 0x00000002, 0x00000003, 0x00000004, 0x00000005, 0x00000006,
0x00000007, 0x00000008, 0x00000009, 0x0000000a, 0x0000000b, 0x0000000c,
0x0000000d, 0x0000000e, 0x0000000f, 0x00000010, 0x00000011, 0x00000012,
0x00000013, 0x00000014, 0x00000015, 0x00000016, 0x00000017, 0x00000018,
0x00000019, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x0000001a, 0x0000001b, 0x0000001c, 0x0000001d, 0x0000001e,
0x0000001f, 0x00000020, 0x00000021, 0x00000022, 0x00000023, 0x00000024,
0x00000025, 0x00000026, 0x00000027, 0x00000028, 0x00000029, 0x0000002a,
0x0000002b, 0x0000002c, 0x0000002d, 0x0000002e, 0x0000002f, 0x00000030,
0x00000031, 0x00000032, 0x00000033, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff,
0x01ffffff, 0x01ffffff, 0x01ffffff, 0x01ffffff};
// TODO fix decoding tables to avoid the need for different indices in big
// endian?
inline constexpr size_t decidx0{1};
inline constexpr size_t decidx1{2};
inline constexpr size_t decidx2{3};
#endif
std::array<char, 256> constexpr encode_table_0 = {
'A', 'A', 'A', 'A', 'B', 'B', 'B', 'B', 'C', 'C', 'C', 'C', 'D', 'D', 'D',
'D', 'E', 'E', 'E', 'E', 'F', 'F', 'F', 'F', 'G', 'G', 'G', 'G', 'H', 'H',
'H', 'H', 'I', 'I', 'I', 'I', 'J', 'J', 'J', 'J', 'K', 'K', 'K', 'K', 'L',
'L', 'L', 'L', 'M', 'M', 'M', 'M', 'N', 'N', 'N', 'N', 'O', 'O', 'O', 'O',
'P', 'P', 'P', 'P', 'Q', 'Q', 'Q', 'Q', 'R', 'R', 'R', 'R', 'S', 'S', 'S',
'S', 'T', 'T', 'T', 'T', 'U', 'U', 'U', 'U', 'V', 'V', 'V', 'V', 'W', 'W',
'W', 'W', 'X', 'X', 'X', 'X', 'Y', 'Y', 'Y', 'Y', 'Z', 'Z', 'Z', 'Z', 'a',
'a', 'a', 'a', 'b', 'b', 'b', 'b', 'c', 'c', 'c', 'c', 'd', 'd', 'd', 'd',
'e', 'e', 'e', 'e', 'f', 'f', 'f', 'f', 'g', 'g', 'g', 'g', 'h', 'h', 'h',
'h', 'i', 'i', 'i', 'i', 'j', 'j', 'j', 'j', 'k', 'k', 'k', 'k', 'l', 'l',
'l', 'l', 'm', 'm', 'm', 'm', 'n', 'n', 'n', 'n', 'o', 'o', 'o', 'o', 'p',
'p', 'p', 'p', 'q', 'q', 'q', 'q', 'r', 'r', 'r', 'r', 's', 's', 's', 's',
't', 't', 't', 't', 'u', 'u', 'u', 'u', 'v', 'v', 'v', 'v', 'w', 'w', 'w',
'w', 'x', 'x', 'x', 'x', 'y', 'y', 'y', 'y', 'z', 'z', 'z', 'z', '0', '0',
'0', '0', '1', '1', '1', '1', '2', '2', '2', '2', '3', '3', '3', '3', '4',
'4', '4', '4', '5', '5', '5', '5', '6', '6', '6', '6', '7', '7', '7', '7',
'8', '8', '8', '8', '9', '9', '9', '9', '+', '+', '+', '+', '/', '/', '/',
'/'};
std::array<char, 256> constexpr encode_table_1 = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',
't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', '+', '/', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K',
'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3',
'4', '5', '6', '7', '8', '9', '+', '/', 'A', 'B', 'C', 'D', 'E', 'F', 'G',
'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V',
'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k',
'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/', 'A', 'B', 'C',
'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R',
'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g',
'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+',
'/'};
} // namespace detail
template <class OutputBuffer, class InputIterator>
inline OutputBuffer encode_into(InputIterator begin, InputIterator end) {
typedef std::decay_t<decltype(*begin)> input_value_type;
static_assert(std::is_same_v<input_value_type, char> ||
std::is_same_v<input_value_type, signed char> ||
std::is_same_v<input_value_type, unsigned char> ||
std::is_same_v<input_value_type, std::byte>);
typedef typename OutputBuffer::value_type output_value_type;
static_assert(std::is_same_v<output_value_type, char> ||
std::is_same_v<output_value_type, signed char> ||
std::is_same_v<output_value_type, unsigned char> ||
std::is_same_v<output_value_type, std::byte>);
const size_t binarytextsize = end - begin;
const size_t encodedsize = (binarytextsize / 3 + (binarytextsize % 3 > 0))
<< 2;
OutputBuffer encoded(encodedsize, detail::padding_char);
const uint8_t* bytes = reinterpret_cast<const uint8_t*>(&*begin);
char* currEncoding = reinterpret_cast<char*>(&encoded[0]);
for (size_t i = binarytextsize / 3; i; --i) {
const uint8_t t1 = *bytes++;
const uint8_t t2 = *bytes++;
const uint8_t t3 = *bytes++;
*currEncoding++ = detail::encode_table_0[t1];
*currEncoding++ =
detail::encode_table_1[((t1 & 0x03) << 4) | ((t2 >> 4) & 0x0F)];
*currEncoding++ =
detail::encode_table_1[((t2 & 0x0F) << 2) | ((t3 >> 6) & 0x03)];
*currEncoding++ = detail::encode_table_1[t3];
}
switch (binarytextsize % 3) {
case 0: {
break;
}
case 1: {
const uint8_t t1 = bytes[0];
*currEncoding++ = detail::encode_table_0[t1];
*currEncoding++ = detail::encode_table_1[(t1 & 0x03) << 4];
// *currEncoding++ = detail::padding_char;
// *currEncoding++ = detail::padding_char;
break;
}
case 2: {
const uint8_t t1 = bytes[0];
const uint8_t t2 = bytes[1];
*currEncoding++ = detail::encode_table_0[t1];
*currEncoding++ =
detail::encode_table_1[((t1 & 0x03) << 4) | ((t2 >> 4) & 0x0F)];
*currEncoding++ = detail::encode_table_1[(t2 & 0x0F) << 2];
// *currEncoding++ = detail::padding_char;
break;
}
default: {
throw std::runtime_error{"Invalid base64 encoded data"};
}
}
return encoded;
}
template <class OutputBuffer>
inline OutputBuffer encode_into(std::string_view data) {
return encode_into<OutputBuffer>(std::begin(data), std::end(data));
}
inline std::string to_base64(std::string_view data) {
return encode_into<std::string>(std::begin(data), std::end(data));
}
template <class OutputBuffer>
inline OutputBuffer decode_into(std::string_view base64Text) {
typedef typename OutputBuffer::value_type output_value_type;
static_assert(std::is_same_v<output_value_type, char> ||
std::is_same_v<output_value_type, signed char> ||
std::is_same_v<output_value_type, unsigned char> ||
std::is_same_v<output_value_type, std::byte>);
if (base64Text.empty()) {
return OutputBuffer();
}
if ((base64Text.size() & 3) != 0) {
throw std::runtime_error{
"Invalid base64 encoded data - Size not divisible by 4"};
}
const size_t numPadding =
std::count(base64Text.rbegin(), base64Text.rbegin() + 4, '=');
if (numPadding > 2) {
throw std::runtime_error{
"Invalid base64 encoded data - Found more than 2 padding signs"};
}
const size_t decodedsize = (base64Text.size() * 3 >> 2) - numPadding;
OutputBuffer decoded(decodedsize, '.');
const uint8_t* bytes = reinterpret_cast<const uint8_t*>(&base64Text[0]);
char* currDecoding = reinterpret_cast<char*>(&decoded[0]);
for (size_t i = (base64Text.size() >> 2) - (numPadding != 0); i; --i) {
const uint8_t t1 = *bytes++;
const uint8_t t2 = *bytes++;
const uint8_t t3 = *bytes++;
const uint8_t t4 = *bytes++;
const uint32_t d1 = detail::decode_table_0[t1];
const uint32_t d2 = detail::decode_table_1[t2];
const uint32_t d3 = detail::decode_table_2[t3];
const uint32_t d4 = detail::decode_table_3[t4];
const uint32_t temp = d1 | d2 | d3 | d4;
if (temp >= detail::bad_char) {
throw std::runtime_error{
"Invalid base64 encoded data - Invalid character"};
}
// Use bit_cast instead of union and type punning to avoid
// undefined behaviour risk:
// https://en.wikipedia.org/wiki/Type_punning#Use_of_union
const std::array<char, 4> tempBytes =
detail::bit_cast<std::array<char, 4>, uint32_t>(temp);
*currDecoding++ = tempBytes[detail::decidx0];
*currDecoding++ = tempBytes[detail::decidx1];
*currDecoding++ = tempBytes[detail::decidx2];
}
switch (numPadding) {
case 0: {
break;
}
case 1: {
const uint8_t t1 = *bytes++;
const uint8_t t2 = *bytes++;
const uint8_t t3 = *bytes++;
const uint32_t d1 = detail::decode_table_0[t1];
const uint32_t d2 = detail::decode_table_1[t2];
const uint32_t d3 = detail::decode_table_2[t3];
const uint32_t temp = d1 | d2 | d3;
if (temp >= detail::bad_char) {
throw std::runtime_error{
"Invalid base64 encoded data - Invalid character"};
}
// Use bit_cast instead of union and type punning to avoid
// undefined behaviour risk:
// https://en.wikipedia.org/wiki/Type_punning#Use_of_union
const std::array<char, 4> tempBytes =
detail::bit_cast<std::array<char, 4>, uint32_t>(temp);
*currDecoding++ = tempBytes[detail::decidx0];
*currDecoding++ = tempBytes[detail::decidx1];
break;
}
case 2: {
const uint8_t t1 = *bytes++;
const uint8_t t2 = *bytes++;
const uint32_t d1 = detail::decode_table_0[t1];
const uint32_t d2 = detail::decode_table_1[t2];
const uint32_t temp = d1 | d2;
if (temp >= detail::bad_char) {
throw std::runtime_error{
"Invalid base64 encoded data - Invalid character"};
}
const std::array<char, 4> tempBytes =
detail::bit_cast<std::array<char, 4>, uint32_t>(temp);
*currDecoding++ = tempBytes[detail::decidx0];
break;
}
default: {
throw std::runtime_error{
"Invalid base64 encoded data - Invalid padding number"};
}
}
return decoded;
}
template <class OutputBuffer, class InputIterator>
inline OutputBuffer decode_into(InputIterator begin, InputIterator end) {
typedef std::decay_t<decltype(*begin)> input_value_type;
static_assert(std::is_same_v<input_value_type, char> ||
std::is_same_v<input_value_type, signed char> ||
std::is_same_v<input_value_type, unsigned char> ||
std::is_same_v<input_value_type, std::byte>);
std::string_view data(reinterpret_cast<const char*>(&*begin), end - begin);
return decode_into<OutputBuffer>(data);
}
inline std::string from_base64(std::string_view data) {
return decode_into<std::string>(data);
}
} // namespace base64
#endif // BASE64_HPP_
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