Abseil Common Libraries (C++) (grcp 依赖)
https://abseil.io/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
59 lines
2.3 KiB
59 lines
2.3 KiB
5 years ago
|
// 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_
|