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/*
* CMS Compression
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/cms_enc.h>
#include <botan/cms_dec.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/oids.h>
#include <botan/pipe.h>
#if defined(BOTAN_HAS_COMPRESSOR_ZLIB)
#include <botan/zlib.h>
#endif
namespace Botan {
/*
* Compress a message
*/
void CMS_Encoder::compress(const std::string& algo)
{
if(!CMS_Encoder::can_compress_with(algo))
throw Invalid_Argument("CMS_Encoder: Cannot compress with " + algo);
Filter* compressor = 0;
#if defined(BOTAN_HAS_COMPRESSOR_ZLIB)
if(algo == "Zlib") compressor = new Zlib_Compression;
#endif
if(compressor == 0)
throw Internal_Error("CMS: Couldn't get ahold of a compressor");
Pipe pipe(compressor);
pipe.process_msg(data);
SecureVector<byte> compressed = pipe.read_all();
DER_Encoder encoder;
encoder.start_cons(SEQUENCE).
encode(static_cast<size_t>(0)).
encode(AlgorithmIdentifier("Compression." + algo,
MemoryVector<byte>())).
raw_bytes(make_econtent(compressed, type)).
end_cons();
add_layer("CMS.CompressedData", encoder);
}
/*
* See if the named compression algo is available
*/
bool CMS_Encoder::can_compress_with(const std::string& algo)
{
if(algo == "")
throw Invalid_Algorithm_Name("Empty string to can_compress_with");
#if defined(BOTAN_HAS_COMPRESSOR_ZLIB)
if(algo == "Zlib")
return true;
#endif
return false;
}
/*
* Decompress a message
*/
void CMS_Decoder::decompress(BER_Decoder& decoder)
{
size_t version;
AlgorithmIdentifier comp_algo;
BER_Decoder comp_info = decoder.start_cons(SEQUENCE);
comp_info.decode(version);
if(version != 0)
throw Decoding_Error("CMS: Unknown version for CompressedData");
comp_info.decode(comp_algo);
read_econtent(comp_info);
comp_info.end_cons();
Filter* decompressor = 0;
info = comp_algo.oid.as_string();
#if defined(BOTAN_HAS_COMPRESSOR_ZLIB)
if(comp_algo.oid == OIDS::lookup("Compression.Zlib"))
{
decompressor = new Zlib_Decompression;
info = "Zlib";
}
#endif
if(!decompressor)
status = FAILURE;
Pipe pipe(decompressor);
pipe.process_msg(data);
data = pipe.read_all();
}
}
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