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/*
* Base64 Encoder/Decoder
* (C) 1999-2010 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/filters.h>
#include <botan/base64.h>
#include <botan/exceptn.h>
#include <algorithm>
namespace Botan {
/*
* Base64_Encoder Constructor
*/
Base64_Encoder::Base64_Encoder(bool breaks, size_t length, bool t_n) :
m_line_length(breaks ? length : 0),
m_trailing_newline(t_n && breaks),
m_in(48),
m_out(64),
m_position(0),
m_out_position(0)
{
}
/*
* Encode and send a block
*/
void Base64_Encoder::encode_and_send(const uint8_t input[], size_t length,
bool final_inputs)
{
while(length)
{
const size_t proc = std::min(length, m_in.size());
size_t consumed = 0;
size_t produced = base64_encode(cast_uint8_ptr_to_char(m_out.data()),
input, proc, consumed, final_inputs);
do_output(m_out.data(), produced);
// FIXME: s/proc/consumed/?
input += proc;
length -= proc;
}
}
/*
* Handle the output
*/
void Base64_Encoder::do_output(const uint8_t input[], size_t length)
{
if(m_line_length == 0)
send(input, length);
else
{
size_t remaining = length, offset = 0;
while(remaining)
{
size_t sent = std::min(m_line_length - m_out_position, remaining);
send(input + offset, sent);
m_out_position += sent;
remaining -= sent;
offset += sent;
if(m_out_position == m_line_length)
{
send('\n');
m_out_position = 0;
}
}
}
}
/*
* Convert some data into Base64
*/
void Base64_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 Base64_Encoder::end_msg()
{
encode_and_send(m_in.data(), m_position, true);
if(m_trailing_newline || (m_out_position && m_line_length))
send('\n');
m_out_position = m_position = 0;
}
/*
* Base64_Decoder Constructor
*/
Base64_Decoder::Base64_Decoder(Decoder_Checking c) :
m_checking(c), m_in(64), m_out(48), m_position(0)
{
}
/*
* Convert some data from Base64
*/
void Base64_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);
if(to_copy == 0)
{
m_in.resize(m_in.size()*2);
m_out.resize(m_out.size()*2);
}
copy_mem(&m_in[m_position], input, to_copy);
m_position += to_copy;
size_t consumed = 0;
size_t written = base64_decode(m_out.data(),
cast_uint8_ptr_to_char(m_in.data()),
m_position,
consumed,
false,
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 Base64_Decoder::end_msg()
{
size_t consumed = 0;
size_t written = base64_decode(m_out.data(),
cast_uint8_ptr_to_char(m_in.data()),
m_position,
consumed,
true,
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("Base64_Decoder: Input not full bytes");
}
}
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