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/*************************************************
* Hex Encoder/Decoder Header File *
* (C) 1999-2007 Jack Lloyd *
*************************************************/
#ifndef BOTAN_HEX_H__
#define BOTAN_HEX_H__
#include <botan/filter.h>
namespace Botan {
/**
* This class represents a hex encoder. It encodes byte arrays to hex strings.
*/
class BOTAN_DLL Hex_Encoder : public Filter
{
public:
/**
* Whether to use uppercase or lowercase letters for the encoded string.
*/
enum Case { Uppercase, Lowercase };
/**
Encode a single byte into two hex characters
*/
static void encode(byte in, byte out[2], Case the_case = Uppercase);
void write(const byte in[], u32bit length);
void end_msg();
/**
* Create a hex encoder.
* @param the_case the case to use in the encoded strings.
*/
Hex_Encoder(Case the_case);
/**
* Create a hex encoder.
* @param newlines should newlines be used
* @param line_length if newlines are used, how long are lines
* @param the_case the case to use in the encoded strings
*/
Hex_Encoder(bool newlines = false,
u32bit line_length = 72,
Case the_case = Uppercase);
private:
void encode_and_send(const byte[], u32bit);
static const byte BIN_TO_HEX_UPPER[16];
static const byte BIN_TO_HEX_LOWER[16];
const Case casing;
const u32bit line_length;
SecureVector<byte> in, out;
u32bit position, counter;
};
/**
* This class represents a hex decoder. It converts hex strings to byte arrays.
*/
class BOTAN_DLL Hex_Decoder : public Filter
{
public:
static byte decode(const byte[2]);
static bool is_valid(byte);
void write(const byte[], u32bit);
void end_msg();
/**
* Construct a Hex Decoder using the specified
* character checking.
* @param checking the checking to use during decoding.
*/
Hex_Decoder(Decoder_Checking checking = NONE);
private:
void decode_and_send(const byte[], u32bit);
void handle_bad_char(byte);
static const byte HEX_TO_BIN[256];
const Decoder_Checking checking;
SecureVector<byte> in, out;
u32bit position;
};
}
#endif
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