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/*************************************************
* BER Decoder Header File *
* (C) 1999-2006 The Botan Project *
*************************************************/
#ifndef BOTAN_BER_DECODER_H__
#define BOTAN_BER_DECODER_H__
#include <botan/asn1_oid.h>
#include <botan/bigint.h>
#include <botan/data_src.h>
namespace Botan {
/*************************************************
* BER Encoded Object *
*************************************************/
struct BER_Object
{
ASN1_Tag type_tag, class_tag;
SecureVector<byte> value;
};
/*************************************************
* BER Decoding Object *
*************************************************/
class BER_Decoder
{
public:
bool more_items() const;
void verify_end() const;
SecureVector<byte> get_remaining();
void discard_remaining();
BER_Object get_next_object();
void push_back(const BER_Object&);
BER_Decoder& decode_null();
BER_Decoder& decode(bool&);
BER_Decoder& decode(u32bit&);
BER_Decoder& decode(class BigInt&);
BER_Decoder& decode(MemoryRegion<byte>&, ASN1_Tag);
BER_Decoder& decode(bool&, ASN1_Tag, ASN1_Tag = CONTEXT_SPECIFIC);
BER_Decoder& decode(u32bit&, ASN1_Tag, ASN1_Tag = CONTEXT_SPECIFIC);
BER_Decoder& decode(class BigInt&,
ASN1_Tag, ASN1_Tag = CONTEXT_SPECIFIC);
BER_Decoder& decode(MemoryRegion<byte>&, ASN1_Tag,
ASN1_Tag, ASN1_Tag = CONTEXT_SPECIFIC);
BER_Decoder(DataSource&);
BER_Decoder(const byte[], u32bit);
BER_Decoder(const MemoryRegion<byte>&);
BER_Decoder(const BER_Decoder&);
~BER_Decoder();
private:
BER_Decoder& operator=(const BER_Decoder&) { return (*this); }
DataSource* source;
BER_Object pushed;
mutable bool owns;
};
/*************************************************
* BER Decoding Functions *
*************************************************/
namespace BER {
void decode(BER_Decoder&, OID&);
BER_Decoder get_subsequence(BER_Decoder&);
BER_Decoder get_subset(BER_Decoder&);
BER_Decoder get_subsequence(BER_Decoder&, ASN1_Tag,
ASN1_Tag = CONTEXT_SPECIFIC);
BER_Decoder get_subset(BER_Decoder&, ASN1_Tag, ASN1_Tag = CONTEXT_SPECIFIC);
std::string to_string(const BER_Object&);
bool decode_optional_string(BER_Decoder&, MemoryRegion<byte>&,
ASN1_Tag, ASN1_Tag, ASN1_Tag);
/*************************************************
* Decode an OPTIONAL or DEFAULT element *
*************************************************/
template<class T>
bool decode_optional(BER_Decoder& in, T& out,
ASN1_Tag type_tag, ASN1_Tag class_tag,
const T& default_value = T())
{
BER_Object obj = in.get_next_object();
if(obj.type_tag == type_tag && obj.class_tag == class_tag)
{
if(class_tag & CONSTRUCTED)
{
BER_Decoder stored_value(obj.value);
//BER::decode(stored_value, out);
stored_value.decode(out);
stored_value.verify_end();
}
else
{
in.push_back(obj);
//BER::decode(in, out, type_tag, class_tag);
in.decode(out, type_tag, class_tag);
}
return true;
}
else
{
out = default_value;
in.push_back(obj);
return false;
}
}
}
}
#endif
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