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/*
* Filter interface for compression
* (C) 2014,2015,2016 Jack Lloyd
* (C) 2015 Matej Kenda
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/comp_filter.h>
#include <botan/exceptn.h>
#if defined(BOTAN_HAS_COMPRESSION)
#include <botan/compression.h>
#endif
namespace Botan {
#if defined(BOTAN_HAS_COMPRESSION)
Compression_Filter::Compression_Filter(const std::string& type, size_t level, size_t bs) :
m_comp(make_compressor(type)),
m_buffersize(std::max<size_t>(bs, 256)),
m_level(level)
{
if(!m_comp)
{
throw Invalid_Argument("Compression type '" + type + "' not found");
}
}
Compression_Filter::~Compression_Filter() { /* for unique_ptr */ }
std::string Compression_Filter::name() const
{
return m_comp->name();
}
void Compression_Filter::start_msg()
{
m_comp->start(m_level);
}
void Compression_Filter::write(const uint8_t input[], size_t input_length)
{
while(input_length)
{
const size_t take = std::min(m_buffersize, input_length);
BOTAN_ASSERT(take > 0, "Consumed something");
m_buffer.assign(input, input + take);
m_comp->update(m_buffer);
send(m_buffer);
input += take;
input_length -= take;
}
}
void Compression_Filter::flush()
{
m_buffer.clear();
m_comp->update(m_buffer, 0, true);
send(m_buffer);
}
void Compression_Filter::end_msg()
{
m_buffer.clear();
m_comp->finish(m_buffer);
send(m_buffer);
}
Decompression_Filter::Decompression_Filter(const std::string& type, size_t bs) :
m_comp(make_decompressor(type)),
m_buffersize(std::max<size_t>(bs, 256))
{
if(!m_comp)
{
throw Invalid_Argument("Compression type '" + type + "' not found");
}
}
Decompression_Filter::~Decompression_Filter() { /* for unique_ptr */ }
std::string Decompression_Filter::name() const
{
return m_comp->name();
}
void Decompression_Filter::start_msg()
{
m_comp->start();
}
void Decompression_Filter::write(const uint8_t input[], size_t input_length)
{
while(input_length)
{
const size_t take = std::min(m_buffersize, input_length);
BOTAN_ASSERT(take > 0, "Consumed something");
m_buffer.assign(input, input + take);
m_comp->update(m_buffer);
send(m_buffer);
input += take;
input_length -= take;
}
}
void Decompression_Filter::end_msg()
{
m_buffer.clear();
m_comp->finish(m_buffer);
send(m_buffer);
}
#endif
}
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