1 files changed, 130 insertions, 0 deletions
diff --git a/src/asn1/ber_dec.h b/src/asn1/ber_dec.h
new file mode 100644
index 000000000..9fec75832
--- /dev/null
+++ b/src/asn1/ber_dec.h
@@ -0,0 +1,130 @@
+/*************************************************
+* BER Decoder Header File                        *
+* (C) 1999-2008 Jack Lloyd                       *
+*************************************************/
+
+#ifndef BOTAN_BER_DECODER_H__
+#define BOTAN_BER_DECODER_H__
+
+#include <botan/asn1_oid.h>
+#include <botan/data_src.h>
+#include <botan/enums.h>
+
+namespace Botan {
+
+/*************************************************
+* BER Decoding Object                            *
+*************************************************/
+class BOTAN_DLL BER_Decoder
+   {
+   public:
+      BER_Object get_next_object();
+      void push_back(const BER_Object&);
+
+      bool more_items() const;
+      BER_Decoder& verify_end();
+      BER_Decoder& discard_remaining();
+
+      BER_Decoder  start_cons(ASN1_Tag, ASN1_Tag = UNIVERSAL);
+      BER_Decoder& end_cons();
+
+      BER_Decoder& raw_bytes(MemoryRegion<byte>&);
+
+      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& decode(class ASN1_Object&);
+
+      template<typename T>
+      BER_Decoder& decode_optional(T&, ASN1_Tag, ASN1_Tag, const T& = T());
+
+      template<typename T>
+      BER_Decoder& decode_list(std::vector<T>&, bool = true);
+
+      BER_Decoder& decode_optional_string(MemoryRegion<byte>&,
+                                          ASN1_Tag, u16bit);
+
+      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); }
+
+      BER_Decoder* parent;
+      DataSource* source;
+      BER_Object pushed;
+      mutable bool owns;
+   };
+
+/*************************************************
+* Decode an OPTIONAL or DEFAULT element          *
+*************************************************/
+template<typename T>
+BER_Decoder& BER_Decoder::decode_optional(T& out,
+                                          ASN1_Tag type_tag,
+                                          ASN1_Tag class_tag,
+                                          const T& default_value)
+   {
+   BER_Object obj = get_next_object();
+
+   if(obj.type_tag == type_tag && obj.class_tag == class_tag)
+      {
+      if(class_tag & CONSTRUCTED)
+         BER_Decoder(obj.value).decode(out).verify_end();
+      else
+         {
+         push_back(obj);
+         decode(out, type_tag, class_tag);
+         }
+      }
+   else
+      {
+      out = default_value;
+      push_back(obj);
+      }
+
+   return (*this);
+   }
+
+/*************************************************
+* Decode a list of homogenously typed values     *
+*************************************************/
+template<typename T>
+BER_Decoder& BER_Decoder::decode_list(std::vector<T>& vec, bool clear_it)
+   {
+   if(clear_it)
+      vec.clear();
+
+   while(more_items())
+      {
+      T value;
+      decode(value);
+      vec.push_back(value);
+      }
+   return (*this);
+   }
+
+/*************************************************
+* BER Decoding Functions                         *
+*************************************************/
+namespace BER {
+
+void BOTAN_DLL decode(BER_Decoder&, Key_Constraints&);
+
+}
+
+}
+
+#endif