tvl-depot/third_party/abseil_cpp/absl/strings/internal/escaping.h
Vincent Ambo fc8dc48020 Add 'third_party/abseil_cpp/' from commit '768eb2ca2857342673fcd462792ce04b8bac3fa3'
git-subtree-dir: third_party/abseil_cpp
git-subtree-mainline: ffb2ae54be
git-subtree-split: 768eb2ca28
2020-05-20 02:32:24 +01:00

58 lines
2.3 KiB
C++

// 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_