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59 lines
2.3 KiB
59 lines
2.3 KiB
2 years ago
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// Copyright 2020 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef ABSL_STRINGS_INTERNAL_ESCAPING_H_
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#define ABSL_STRINGS_INTERNAL_ESCAPING_H_
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#include <cassert>
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#include "absl/strings/internal/resize_uninitialized.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace strings_internal {
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ABSL_CONST_INIT extern const char kBase64Chars[];
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// Calculates how long a string will be when it is base64 encoded given its
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// length and whether or not the result should be padded.
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size_t CalculateBase64EscapedLenInternal(size_t input_len, bool do_padding);
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// Base64-encodes `src` using the alphabet provided in `base64` and writes the
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// result to `dest`. If `do_padding` is true, `dest` is padded with '=' chars
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// until its length is a multiple of 3. Returns the length of `dest`.
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size_t Base64EscapeInternal(const unsigned char* src, size_t szsrc, char* dest,
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size_t szdest, const char* base64, bool do_padding);
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// Base64-encodes `src` using the alphabet provided in `base64` and writes the
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// result to `dest`. If `do_padding` is true, `dest` is padded with '=' chars
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// until its length is a multiple of 3.
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template <typename String>
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void Base64EscapeInternal(const unsigned char* src, size_t szsrc, String* dest,
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bool do_padding, const char* base64_chars) {
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const size_t calc_escaped_size =
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CalculateBase64EscapedLenInternal(szsrc, do_padding);
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STLStringResizeUninitialized(dest, calc_escaped_size);
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const size_t escaped_len = Base64EscapeInternal(
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src, szsrc, &(*dest)[0], dest->size(), base64_chars, do_padding);
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assert(calc_escaped_size == escaped_len);
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dest->erase(escaped_len);
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}
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} // namespace strings_internal
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ABSL_NAMESPACE_END
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} // namespace absl
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#endif // ABSL_STRINGS_INTERNAL_ESCAPING_H_
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