1 files changed, 119 insertions, 0 deletions
diff --git a/include/ber_dec.h b/include/ber_dec.h
new file mode 100644
index 000000000..32feb43e1
--- /dev/null
+++ b/include/ber_dec.h
@@ -0,0 +1,119 @@
+/*************************************************
+* 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