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// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_BASE64_H_
#define BASE_BASE64_H_
#include <stdint.h>
#include <optional>
#include <string>
#include <string_view>
#include <vector>
#include "base/base_export.h"
#include "base/containers/span.h"
namespace base {
// Encodes the input binary data in base64.
BASE_EXPORT std::string Base64Encode(span<const uint8_t> input);
// Encodes the input binary data in base64 and appends it to the output.
BASE_EXPORT void Base64EncodeAppend(span<const uint8_t> input,
std::string* output);
// Encodes the input string in base64.
BASE_EXPORT std::string Base64Encode(std::string_view input);
// Same as Base64Encode(), but does not access any base::Feature. This is only
// necessary for code that runs at early startup before base::FeatureList
// registration. As such, there is only a span version.
// TODO(crbug.com/468035603): Remove this once Base64Encode() stops accessing
// base::Feature.
BASE_EXPORT std::string Base64EncodeEarlyStartup(span<const uint8_t> input);
// Decodes the base64 input string. Returns true if successful and false
// otherwise. The output string is only modified if successful. The decoding can
// be done in-place.
enum class Base64DecodePolicy {
// Input should match the output format of Base64Encode. i.e.
// - Input length should be divisible by 4
// - Maximum of 2 padding characters
// - No non-base64 characters.
kStrict,
// Matches https://infra.spec.whatwg.org/#forgiving-base64-decode.
// - Removes all ascii whitespace
// - Maximum of 2 padding characters
// - Allows input length not divisible by 4 if no padding chars are added.
kForgiving,
};
BASE_EXPORT bool Base64Decode(
std::string_view input,
std::string* output,
Base64DecodePolicy policy = Base64DecodePolicy::kStrict);
// Decodes the base64 input string. Returns `std::nullopt` if unsuccessful.
BASE_EXPORT std::optional<std::vector<uint8_t>> Base64Decode(
std::string_view input);
} // namespace base
#endif // BASE_BASE64_H_
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