// 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[]; // Calculates how long a string will be when it is base64 encoded given its // length and whether or not the result should be padded. size_t CalculateBase64EscapedLenInternal(size_t input_len, bool do_padding); // Base64-encodes `src` using the alphabet provided in `base64` 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); // Base64-encodes `src` using the alphabet provided in `base64` and writes the // result to `dest`. If `do_padding` is true, `dest` is padded with '=' chars // until its length is a multiple of 3. template <typename String> void Base64EscapeInternal(const unsigned char* src, size_t szsrc, String* dest, bool do_padding, const char* base64_chars) { const size_t calc_escaped_size = CalculateBase64EscapedLenInternal(szsrc, do_padding); STLStringResizeUninitialized(dest, calc_escaped_size); const size_t escaped_len = Base64EscapeInternal( src, szsrc, &(*dest)[0], dest->size(), base64_chars, do_padding); assert(calc_escaped_size == escaped_len); dest->erase(escaped_len); } } // namespace strings_internal ABSL_NAMESPACE_END } // namespace absl #endif // ABSL_STRINGS_INTERNAL_ESCAPING_H_