mirror of
https://github.com/quizhizhe/LiteLoaderBDS-1.16.40.git
synced 2025-06-06 12:03:39 +00:00
120 lines
3.9 KiB
C++
120 lines
3.9 KiB
C++
#pragma once
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#include <string>
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/**
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* The MIT License (MIT)
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* Copyright (c) 2022 WangYneos
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal text_input the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included text_input all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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namespace Base64 {
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inline const char _base64_table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789+/";
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inline size_t getEncodeLength(size_t len) {
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return (len + 2 - ((len + 2) % 3)) / 3 * 4;
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}
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inline size_t getEncodeLength(const std::string& str) {
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return getEncodeLength(str.length());
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}
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inline size_t getDecodeLength(const std::string& in) {
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unsigned char count = 0;
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size_t input_size = in.size();
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for (auto it = in.rbegin(); *it == '='; ++it) {
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++count;
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}
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input_size -= count; // remove padding size
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count = 0; // reset padding counter
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while (input_size % 4) { // redo padding
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input_size++;
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count++;
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}
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return ((6 * input_size) / 8) - count;
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}
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inline unsigned char decodeLookup(unsigned char c) {
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if (c >= 'A' && c <= 'Z')
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return c - 'A';
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if (c >= 'a' && c <= 'z')
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return c - 71;
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if (c >= '0' && c <= '9')
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return c + 4;
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if (c == '+')
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return 62;
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if (c == '/')
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return 63;
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return 64;
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}
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inline std::string Encode(const std::string& text_input) {
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std::string result;
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result.reserve(getEncodeLength(text_input));
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int i = 0;
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int j = -6;
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for (auto c : text_input) {
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i = (i << 8) + static_cast<uint8_t>(c);
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j += 8;
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while (j >= 0) {
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result += _base64_table[(i >> j) & 0x3F];
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j -= 6;
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}
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}
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if (j > -6) {
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result += _base64_table[((i << 8) >> (j + 8)) & 0x3F];
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}
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// padding
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while (result.size() % 4) {
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result.push_back('=');
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}
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return result;
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}
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inline std::string Decode(const std::string& base64_input) {
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size_t input_size = base64_input.size();
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size_t output_size = getDecodeLength(base64_input);
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std::string out;
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out.resize(output_size);
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for (size_t i = 0, j = 0; i < input_size;) {
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uint32_t c1 = (i > input_size || base64_input[i] == '=') ? 0 & i++ : decodeLookup(base64_input[i++]);
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uint32_t c2 = (i > input_size || base64_input[i] == '=') ? 0 & i++ : decodeLookup(base64_input[i++]);
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uint32_t c3 = (i > input_size || base64_input[i] == '=') ? 0 & i++ : decodeLookup(base64_input[i++]);
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uint32_t c4 = (i > input_size || base64_input[i] == '=') ? 0 & i++ : decodeLookup(base64_input[i++]);
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uint32_t data = (c1 << 3 * 6) + (c2 << 2 * 6) + (c3 << 1 * 6) + (c4 << 0 * 6);
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if (j < output_size)
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out[j++] = (data >> 2 * 8) & 0xFF;
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if (j < output_size)
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out[j++] = (data >> 1 * 8) & 0xFF;
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if (j < output_size)
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out[j++] = (data >> 0 * 8) & 0xFF;
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}
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return out;
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}
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} // namespace Base64
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