1 // Copyright 2011 The Chromium Authors 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef BASE_BASE64_H_ 6 #define BASE_BASE64_H_ 7 8 #include <stdint.h> 9 10 #include <optional> 11 #include <string> 12 #include <string_view> 13 #include <vector> 14 15 #include "base/base_export.h" 16 #include "base/containers/span.h" 17 18 namespace base { 19 20 // Encodes the input binary data in base64. 21 BASE_EXPORT std::string Base64Encode(span<const uint8_t> input); 22 23 // Encodes the input binary data in base64 and appends it to the output. 24 BASE_EXPORT void Base64EncodeAppend(span<const uint8_t> input, 25 std::string* output); 26 27 // Encodes the input string in base64. 28 BASE_EXPORT std::string Base64Encode(std::string_view input); 29 30 // Decodes the base64 input string. Returns true if successful and false 31 // otherwise. The output string is only modified if successful. The decoding can 32 // be done in-place. 33 enum class Base64DecodePolicy { 34 // Input should match the output format of Base64Encode. i.e. 35 // - Input length should be divisible by 4 36 // - Maximum of 2 padding characters 37 // - No non-base64 characters. 38 kStrict, 39 40 // Matches https://infra.spec.whatwg.org/#forgiving-base64-decode. 41 // - Removes all ascii whitespace 42 // - Maximum of 2 padding characters 43 // - Allows input length not divisible by 4 if no padding chars are added. 44 kForgiving, 45 }; 46 BASE_EXPORT bool Base64Decode( 47 std::string_view input, 48 std::string* output, 49 Base64DecodePolicy policy = Base64DecodePolicy::kStrict); 50 51 // Decodes the base64 input string. Returns `std::nullopt` if unsuccessful. 52 BASE_EXPORT std::optional<std::vector<uint8_t>> Base64Decode( 53 std::string_view input); 54 55 } // namespace base 56 57 #endif // BASE_BASE64_H_ 58