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/*
* Hex Encoder/Decoder
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/filters.h>
#include <botan/hex.h>
#include <botan/exceptn.h>
#include <algorithm>
namespace Botan {
/**
* Size used for internal buffer in hex encoder/decoder
*/
const size_t HEX_CODEC_BUFFER_SIZE = 256;
/*
* Hex_Encoder Constructor
*/
Hex_Encoder::Hex_Encoder(bool breaks, size_t length, Case c) :
m_casing(c), m_line_length(breaks ? length : 0)
{
m_in.resize(HEX_CODEC_BUFFER_SIZE);
m_out.resize(2*m_in.size());
m_counter = m_position = 0;
}
/*
* Hex_Encoder Constructor
*/
Hex_Encoder::Hex_Encoder(Case c) : m_casing(c), m_line_length(0)
{
m_in.resize(HEX_CODEC_BUFFER_SIZE);
m_out.resize(2*m_in.size());
m_counter = m_position = 0;
}
/*
* Encode and send a block
*/
void Hex_Encoder::encode_and_send(const uint8_t block[], size_t length)
{
hex_encode(cast_uint8_ptr_to_char(m_out.data()),
block, length,
m_casing == Uppercase);
if(m_line_length == 0)
send(m_out, 2*length);
else
{
size_t remaining = 2*length, offset = 0;
while(remaining)
{
size_t sent = std::min(m_line_length - m_counter, remaining);
send(&m_out[offset], sent);
m_counter += sent;
remaining -= sent;
offset += sent;
if(m_counter == m_line_length)
{
send('\n');
m_counter = 0;
}
}
}
}
/*
* Convert some data into hex format
*/
void Hex_Encoder::write(const uint8_t input[], size_t length)
{
buffer_insert(m_in, m_position, input, length);
if(m_position + length >= m_in.size())
{
encode_and_send(m_in.data(), m_in.size());
input += (m_in.size() - m_position);
length -= (m_in.size() - m_position);
while(length >= m_in.size())
{
encode_and_send(input, m_in.size());
input += m_in.size();
length -= m_in.size();
}
copy_mem(m_in.data(), input, length);
m_position = 0;
}
m_position += length;
}
/*
* Flush buffers
*/
void Hex_Encoder::end_msg()
{
encode_and_send(m_in.data(), m_position);
if(m_counter && m_line_length)
send('\n');
m_counter = m_position = 0;
}
/*
* Hex_Decoder Constructor
*/
Hex_Decoder::Hex_Decoder(Decoder_Checking c) : m_checking(c)
{
m_in.resize(HEX_CODEC_BUFFER_SIZE);
m_out.resize(m_in.size() / 2);
m_position = 0;
}
/*
* Convert some data from hex format
*/
void Hex_Decoder::write(const uint8_t input[], size_t length)
{
while(length)
{
size_t to_copy = std::min<size_t>(length, m_in.size() - m_position);
copy_mem(&m_in[m_position], input, to_copy);
m_position += to_copy;
size_t consumed = 0;
size_t written = hex_decode(m_out.data(),
cast_uint8_ptr_to_char(m_in.data()),
m_position,
consumed,
m_checking != FULL_CHECK);
send(m_out, written);
if(consumed != m_position)
{
copy_mem(m_in.data(), m_in.data() + consumed, m_position - consumed);
m_position = m_position - consumed;
}
else
m_position = 0;
length -= to_copy;
input += to_copy;
}
}
/*
* Flush buffers
*/
void Hex_Decoder::end_msg()
{
size_t consumed = 0;
size_t written = hex_decode(m_out.data(),
cast_uint8_ptr_to_char(m_in.data()),
m_position,
consumed,
m_checking != FULL_CHECK);
send(m_out, written);
const bool not_full_bytes = consumed != m_position;
m_position = 0;
if(not_full_bytes)
throw Invalid_Argument("Hex_Decoder: Input not full bytes");
}
}
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