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/*
* Compression Transform
* (C) 2014 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/compression.h>
namespace Botan {
void Stream_Compression::clear()
{
m_stream.reset();
}
secure_vector<byte> Stream_Compression::start_raw(const byte[], size_t nonce_len)
{
if(!valid_nonce_length(nonce_len))
throw Invalid_IV_Length(name(), nonce_len);
clear();
m_stream.reset(make_stream());
return secure_vector<byte>();
}
void Stream_Compression::process(secure_vector<byte>& buf, size_t offset, u32bit flags)
{
BOTAN_ASSERT(m_stream, "Initialized");
BOTAN_ASSERT(buf.size() >= offset, "Offset is sane");
if(m_buffer.size() < buf.size() + offset)
m_buffer.resize(buf.size() + offset);
m_stream->next_in(&buf[offset], buf.size() - offset);
m_stream->next_out(&m_buffer[offset], m_buffer.size() - offset);
while(true)
{
const bool end = m_stream->run(flags);
if(m_stream->avail_out() == 0)
{
const size_t added = 8 + m_buffer.size();
m_buffer.resize(m_buffer.size() + added);
m_stream->next_out(&m_buffer[m_buffer.size() - added], added);
}
else if(m_stream->avail_in() == 0)
{
m_buffer.resize(m_buffer.size() - m_stream->avail_out());
break;
}
}
copy_mem(&m_buffer[0], &buf[0], offset);
buf.swap(m_buffer);
}
void Stream_Compression::update(secure_vector<byte>& buf, size_t offset)
{
process(buf, offset, m_stream->run_flag());
}
void Stream_Compression::flush(secure_vector<byte>& buf, size_t offset)
{
process(buf, offset, m_stream->flush_flag());
}
void Stream_Compression::finish(secure_vector<byte>& buf, size_t offset)
{
process(buf, offset, m_stream->finish_flag());
clear();
}
void Stream_Decompression::clear()
{
m_stream.reset();
}
secure_vector<byte> Stream_Decompression::start_raw(const byte[], size_t nonce_len)
{
if(!valid_nonce_length(nonce_len))
throw Invalid_IV_Length(name(), nonce_len);
clear();
m_stream.reset(make_stream());
return secure_vector<byte>();
}
void Stream_Decompression::process(secure_vector<byte>& buf, size_t offset, u32bit flags)
{
BOTAN_ASSERT(m_stream, "Initialized");
BOTAN_ASSERT(buf.size() >= offset, "Offset is sane");
if(m_buffer.size() < buf.size() + offset)
m_buffer.resize(buf.size() + offset);
m_stream->next_in(&buf[offset], buf.size() - offset);
m_stream->next_out(&m_buffer[offset], m_buffer.size() - offset);
while(true)
{
const bool stream_end = m_stream->run(flags);
if(stream_end)
{
if(m_stream->avail_in() == 0) // all data consumed?
{
m_buffer.resize(m_buffer.size() - m_stream->avail_out());
clear();
break;
}
// More data follows: try to process as a following stream
const size_t read = (buf.size() - offset) - m_stream->avail_in();
start();
m_stream->next_in(&buf[offset + read], buf.size() - offset - read);
}
if(m_stream->avail_out() == 0)
{
const size_t added = 8 + m_buffer.size();
m_buffer.resize(m_buffer.size() + added);
m_stream->next_out(&m_buffer[m_buffer.size() - added], added);
}
else if(m_stream->avail_in() == 0)
{
m_buffer.resize(m_buffer.size() - m_stream->avail_out());
break;
}
}
copy_mem(&m_buffer[0], &buf[0], offset);
buf.swap(m_buffer);
}
void Stream_Decompression::update(secure_vector<byte>& buf, size_t offset)
{
process(buf, offset, m_stream->run_flag());
}
void Stream_Decompression::finish(secure_vector<byte>& buf, size_t offset)
{
if(buf.size() != offset || m_stream.get())
process(buf, offset, m_stream->finish_flag());
if(m_stream.get())
throw std::runtime_error(name() + " finished but not at stream end");
}
}
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