/*
* Hex Encoding and Decoding
* (C) 2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/

#ifndef BOTAN_HEX_CODEC_H__
#define BOTAN_HEX_CODEC_H__

#include <botan/secmem.h>
#include <string>

namespace Botan {

/**
* Perform hex encoding
* @param output an array of at least input_length*2 bytes
* @param input is some binary data
* @param input_length length of input in bytes
* @param uppercase should output be upper or lower case?
*/
void BOTAN_DLL hex_encode(char output[],
                          const byte input[],
                          size_t input_length,
                          bool uppercase = true);

/**
* Perform hex encoding
* @param input some input
* @param input_length length of input in bytes
* @param uppercase should output be upper or lower case?
* @return hexadecimal representation of input
*/
std::string BOTAN_DLL hex_encode(const byte input[],
                                 size_t input_length,
                                 bool uppercase = true);

/**
* Perform hex encoding
* @param input some input
* @param uppercase should output be upper or lower case?
* @return hexadecimal representation of input
*/
template<typename Alloc>
std::string hex_encode(const std::vector<byte, Alloc>& input,
                       bool uppercase = true)
   {
   return hex_encode(&input[0], input.size(), uppercase);
   }

/**
* Perform hex decoding
* @param output an array of at least input_length/2 bytes
* @param input some hex input
* @param input_length length of input in bytes
* @param input_consumed is an output parameter which says how many
*        bytes of input were actually consumed. If less than
*        input_length, then the range input[consumed:length]
*        should be passed in later along with more input.
* @param ignore_ws ignore whitespace on input; if false, throw an
                   exception if whitespace is encountered
* @return number of bytes written to output
*/
size_t BOTAN_DLL hex_decode(byte output[],
                            const char input[],
                            size_t input_length,
                            size_t& input_consumed,
                            bool ignore_ws = true);

/**
* Perform hex decoding
* @param output an array of at least input_length/2 bytes
* @param input some hex input
* @param input_length length of input in bytes
* @param ignore_ws ignore whitespace on input; if false, throw an
                   exception if whitespace is encountered
* @return number of bytes written to output
*/
size_t BOTAN_DLL hex_decode(byte output[],
                            const char input[],
                            size_t input_length,
                            bool ignore_ws = true);

/**
* Perform hex decoding
* @param output an array of at least input_length/2 bytes
* @param input some hex input
* @param ignore_ws ignore whitespace on input; if false, throw an
                   exception if whitespace is encountered
* @return number of bytes written to output
*/
size_t BOTAN_DLL hex_decode(byte output[],
                            const std::string& input,
                            bool ignore_ws = true);

/**
* Perform hex decoding
* @param input some hex input
* @param input_length the length of input in bytes
* @param ignore_ws ignore whitespace on input; if false, throw an
                   exception if whitespace is encountered
* @return decoded hex output
*/
std::vector<byte> BOTAN_DLL
hex_decode(const char input[],
           size_t input_length,
           bool ignore_ws = true);

/**
* Perform hex decoding
* @param input some hex input
* @param ignore_ws ignore whitespace on input; if false, throw an
                   exception if whitespace is encountered
* @return decoded hex output
*/
std::vector<byte> BOTAN_DLL
hex_decode(const std::string& input,
           bool ignore_ws = true);


/**
* Perform hex decoding
* @param input some hex input
* @param input_length the length of input in bytes
* @param ignore_ws ignore whitespace on input; if false, throw an
                   exception if whitespace is encountered
* @return decoded hex output
*/
secure_vector<byte> BOTAN_DLL
hex_decode_locked(const char input[],
                  size_t input_length,
                  bool ignore_ws = true);

/**
* Perform hex decoding
* @param input some hex input
* @param ignore_ws ignore whitespace on input; if false, throw an
                   exception if whitespace is encountered
* @return decoded hex output
*/
secure_vector<byte> BOTAN_DLL
hex_decode_locked(const std::string& input,
                  bool ignore_ws = true);

}

#endif