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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/react-native/ReactCommon/jsinspector-modern
Просмотр файла: Base64.h
/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
#pragma once
#include <string>
#include <string_view>
namespace facebook::react::jsinspector_modern {
namespace {
// Vendored from Folly
// https://github.com/facebook/folly/blob/v2024.07.08.00/folly/detail/base64_detail/Base64Scalar.h
constexpr char kBase64Charset[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
constexpr char kBase64URLCharset[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
template <bool isURL>
struct Base64ScalarImpl {
static constexpr const char* kCharset =
isURL ? kBase64URLCharset : kBase64Charset;
// 0, 1 or 2 bytes
static constexpr char* encodeTail(const char* f, const char* l, char* o) {
if (f == l) {
return o;
}
std::uint8_t aaab = f[0];
std::uint8_t aaa = aaab >> 2;
*o++ = kCharset[aaa];
// duplicating some tail handling to try to do less jumps
if (l - f == 1) {
std::uint8_t b00 = aaab << 4 & 0x3f;
*o++ = kCharset[b00];
if constexpr (!isURL) {
*o++ = '=';
*o++ = '=';
}
return o;
}
// l - f == 2
std::uint8_t bbcc = f[1];
std::uint8_t bbb = ((aaab << 4) | (bbcc >> 4)) & 0x3f;
std::uint8_t cc0 = (bbcc << 2) & 0x3f;
*o++ = kCharset[bbb];
*o++ = kCharset[cc0];
if constexpr (!isURL) {
*o++ = '=';
}
return o;
}
static constexpr char* encode(const char* f, const char* l, char* o) {
while ((l - f) >= 3) {
std::uint8_t aaab = f[0];
std::uint8_t bbcc = f[1];
std::uint8_t cddd = f[2];
std::uint8_t aaa = aaab >> 2;
std::uint8_t bbb = ((aaab << 4) | (bbcc >> 4)) & 0x3f;
std::uint8_t ccc = ((bbcc << 2) | (cddd >> 6)) & 0x3f;
std::uint8_t ddd = cddd & 0x3f;
o[0] = kCharset[aaa];
o[1] = kCharset[bbb];
o[2] = kCharset[ccc];
o[3] = kCharset[ddd];
f += 3;
o += 4;
}
return encodeTail(f, l, o);
}
};
// https://github.com/facebook/folly/blob/v2024.07.08.00/folly/detail/base64_detail/Base64Common.h#L24
constexpr std::size_t base64EncodedSize(std::size_t inSize) {
return ((inSize + 2) / 3) * 4;
}
} // namespace
inline std::string base64Encode(const std::string_view s) {
std::string res(base64EncodedSize(s.size()), '\0');
Base64ScalarImpl<false>::encode(s.data(), s.data() + s.size(), res.data());
return res;
}
} // namespace facebook::react::jsinspector_modern
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