// Copyright 2020 The Abseil Authors. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // https://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. #ifndef ABSL_STRINGS_INTERNAL_ESCAPING_H_ #define ABSL_STRINGS_INTERNAL_ESCAPING_H_ #include <cassert> #include "absl/strings/internal/resize_uninitialized.h" namespace absl { ABSL_NAMESPACE_BEGIN namespace strings_internal { ABSL_CONST_INIT extern const char kBase64Chars[]; ABSL_CONST_INIT extern const char kWebSafeBase64Chars[]; // Calculates the length of a Base64 encoding (RFC 4648) of a string of length // `input_len`, with or without padding per `do_padding`. Note that 'web-safe' // encoding (section 5 of the RFC) does not change this length. size_t CalculateBase64EscapedLenInternal(size_t input_len, bool do_padding); // Base64-encodes `src` using the alphabet provided in `base64` (which // determines whether to do web-safe encoding or not) and writes the result to // `dest`. If `do_padding` is true, `dest` is padded with '=' chars until its // length is a multiple of 3. Returns the length of `dest`. size_t Base64EscapeInternal(const unsigned char* src, size_t szsrc, char* dest, size_t szdest, const char* base64, bool do_padding); template <typename String> void Base64EscapeInternal(const unsigned char* src, size_t szsrc, String* dest, bool do_padding, const char* base64_chars) { … } } // namespace strings_internal ABSL_NAMESPACE_END } // namespace absl #endif // ABSL_STRINGS_INTERNAL_ESCAPING_H_