// 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.
std::vector<uint8_t> a2b_hex(const std::string& b);
std::vector<uint8_t> a2b_hex(const std::string& label,
                             const std::string& b);
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.
std::string b2a_hex(const std::vector<uint8_t>& b);
std::string unlimited_b2a_hex(const std::vector<uint8_t>& b);
std::string b2a_hex(const std::string& b);
std::string unlimited_b2a_hex(const std::string& b);
std::string HexEncode(const uint8_t* bytes, size_t size);
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.
std::string Base64Encode(const std::vector<uint8_t>& bin_input);
std::string Base64Encode(const std::string& bin_input);
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.
std::string Base64SafeEncode(const std::vector<uint8_t>& bin_input);
std::string Base64SafeEncode(const std::string& bin_input);
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.
std::string Base64SafeEncodeNoPad(const std::vector<uint8_t>& bin_input);
std::string Base64SafeEncodeNoPad(const std::string& bin_input);

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

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

// Converts a byte string representing an ID into a log-friendly form.
//
// Conversion rules:
// 1) empty - returns <empty>
// 2) printable ASCII only - original content, surrounded by double
//                           quotes; double quotes and backslashes
//                           are escaped, like C/C++ string literals.
// 3) otherwise - Unquoted, hexadecimal encoded string.
//
// Intended to be used on ID strings which are provided/generated
// from sources outside of the CDM.
std::string SafeByteIdToString(const std::string& id);
std::string SafeByteIdToString(const std::vector<uint8_t>& id);
}  // namespace wvutil
#endif  // WVCDM_UTIL_STRING_CONVERSIONS_H_