// Copyright 2018 Google LLC. All Rights Reserved. This file and proprietary
// source code may only be used and distributed under the Widevine License
// Agreement.
#ifndef WVCDM_UTIL_STRING_CONVERSIONS_H_
#define WVCDM_UTIL_STRING_CONVERSIONS_H_

#include <stddef.h>
#include <stdint.h>

#include <string>
#include <vector>

#include "util_common.h"

namespace wvutil {

// ASCII hex to Binary conversion.
CORE_UTIL_EXPORT std::vector<uint8_t> a2b_hex(const std::string& b);
CORE_UTIL_EXPORT std::vector<uint8_t> a2b_hex(const std::string& label,
                                              const std::string& b);
CORE_UTIL_EXPORT std::string a2bs_hex(const std::string& b);

// Binary to ASCII hex conversion. The default versions limit output to 2k to
// protect us from log spam. The unlimited version has no length limit.
CORE_UTIL_EXPORT std::string b2a_hex(const std::vector<uint8_t>& b);
CORE_UTIL_EXPORT std::string unlimited_b2a_hex(const std::vector<uint8_t>& b);
CORE_UTIL_EXPORT std::string b2a_hex(const std::string& b);
CORE_UTIL_EXPORT std::string unlimited_b2a_hex(const std::string& b);
CORE_UTIL_EXPORT std::string HexEncode(const uint8_t* bytes, size_t size);
CORE_UTIL_EXPORT std::string UnlimitedHexEncode(const uint8_t* bytes,
                                                size_t size);

// Base64 encoding/decoding.
// Converts binary data into the ASCII Base64 character set and vice
// versa using the encoding rules defined in RFC4648 section 4.
CORE_UTIL_EXPORT std::string Base64Encode(
    const std::vector<uint8_t>& bin_input);
CORE_UTIL_EXPORT std::string Base64Encode(const std::string& bin_input);
CORE_UTIL_EXPORT std::vector<uint8_t> Base64Decode(
    const std::string& bin_input);

// URL-Safe Base64 encoding/decoding.
// Converts binary data into the URL/Filename safe ASCII Base64
// character set and vice versa using the encoding rules defined in
// RFC4648 section 5.
CORE_UTIL_EXPORT std::string Base64SafeEncode(
    const std::vector<uint8_t>& bin_input);
CORE_UTIL_EXPORT std::string Base64SafeEncode(const std::string& bin_input);
CORE_UTIL_EXPORT std::vector<uint8_t> Base64SafeDecode(
    const std::string& bin_input);
// URL-Safe Base64 encoding without padding.
// Similar to Base64SafeEncode(), without any padding character '='
// at the end.
CORE_UTIL_EXPORT std::string Base64SafeEncodeNoPad(
    const std::vector<uint8_t>& bin_input);
CORE_UTIL_EXPORT std::string Base64SafeEncodeNoPad(
    const std::string& bin_input);

// Host to Network/Network to Host conversion.
CORE_UTIL_EXPORT int64_t htonll64(int64_t x);
CORE_UTIL_EXPORT inline int64_t ntohll64(int64_t x) { return htonll64(x); }

// Encode unsigned integer into a big endian formatted string.
CORE_UTIL_EXPORT std::string EncodeUint32(uint32_t u);

}  // namespace wvutil

#endif  // WVCDM_UTIL_STRING_CONVERSIONS_H_