diff --git a/ndn-cpp/c/encoding/BinaryXMLInterest.c b/ndn-cpp/c/encoding/BinaryXMLInterest.c
index 1131428..7939556 100644
--- a/ndn-cpp/c/encoding/BinaryXMLInterest.c
+++ b/ndn-cpp/c/encoding/BinaryXMLInterest.c
@@ -1,5 +1,6 @@
 /**
  * @author: Jeff Thompson
+ * Derived from Interest.js by Meki Cheraoui.
  * See COPYING for copyright and distribution information.
  */
 
@@ -8,6 +9,74 @@
 #include "BinaryXMLName.h"
 #include "BinaryXMLInterest.h"
 
+ndn_Error ndn_encodeBinaryXMLInterest(struct ndn_Interest *interest, struct ndn_BinaryXMLEncoder *encoder)
+{
+  ndn_Error error;
+  if (error = ndn_BinaryXMLEncoder_writeElementStartDTag(encoder, ndn_BinaryXML_DTag_Interest))
+    return error;
+    
+  if (error = ndn_encodeBinaryXMLName(&interest->name, encoder))
+    return error;
+  
+  if (interest->minSuffixComponents >= 0) {
+    if (error = ndn_BinaryXMLEncoder_writeUnsignedDecimalIntDTagElement
+        (encoder, ndn_BinaryXML_DTag_MinSuffixComponents, (unsigned int)interest->minSuffixComponents))
+      return error;
+  }
+  if (interest->maxSuffixComponents >= 0) {
+    if (error = ndn_BinaryXMLEncoder_writeUnsignedDecimalIntDTagElement
+        (encoder, ndn_BinaryXML_DTag_MaxSuffixComponents, (unsigned int)interest->maxSuffixComponents))
+      return error;
+  }
+    
+  if (interest->publisherPublicKeyDigest && interest->publisherPublicKeyDigestLength > 0) {
+    if (error = ndn_BinaryXMLEncoder_writeBlobDTagElement
+        (encoder, ndn_BinaryXML_DTag_PublisherPublicKeyDigest, interest->publisherPublicKeyDigest, interest->publisherPublicKeyDigestLength))
+      return error;
+  }
+  
+  // TODO: Implement exclude
+
+  if (interest->childSelector >= 0) {
+    if (error = ndn_BinaryXMLEncoder_writeUnsignedDecimalIntDTagElement
+        (encoder, ndn_BinaryXML_DTag_ChildSelector, (unsigned int)interest->childSelector))
+      return error;
+  }
+  if (interest->answerOriginKind >= 0 && interest->answerOriginKind != ndn_Interest_DEFAULT_ANSWER_ORIGIN_KIND) {
+    if (error = ndn_BinaryXMLEncoder_writeUnsignedDecimalIntDTagElement
+        (encoder, ndn_BinaryXML_DTag_AnswerOriginKind, (unsigned int)interest->answerOriginKind))
+      return error;
+  }
+  if (interest->scope >= 0) {
+    if (error = ndn_BinaryXMLEncoder_writeUnsignedDecimalIntDTagElement
+        (encoder, ndn_BinaryXML_DTag_Scope, (unsigned int)interest->scope))
+      return error;
+  }
+  
+  if (interest->interestLifetime >= 0) {
+    if (error = ndn_BinaryXMLEncoder_writeElementStartDTag(encoder, ndn_BinaryXML_DTag_InterestLifetime))
+      return error;
+   
+    unsigned int ticks = (unsigned int)(((double)interest->interestLifetime / 1000.0) * 4096.0);
+    if (error = ndn_BinaryXMLEncoder_writeUnsignedIntBigEndianBlob(encoder, ticks))
+      return error;
+    
+    if (error = ndn_BinaryXMLEncoder_writeElementClose(encoder))
+      return error;
+  }
+  
+  if (interest->nonce && interest->nonceLength > 0) {
+    if (error = ndn_BinaryXMLEncoder_writeBlobDTagElement
+        (encoder, ndn_BinaryXML_DTag_Nonce, interest->nonce, interest->nonceLength))
+      return error;
+  }
+  
+	if (error = ndn_BinaryXMLEncoder_writeElementClose(encoder))
+    return error;
+  
+  return 0;  
+}
+
 ndn_Error ndn_decodeBinaryXMLInterest(struct ndn_Interest *interest, struct ndn_BinaryXMLDecoder *decoder)
 {
   ndn_Error error;
@@ -59,8 +128,8 @@
         (decoder, ndn_BinaryXML_DTag_InterestLifetime, 0, &interestLifetime, &interestLifetimeLength))
       return error;
     
-    interest->interestLifetime = 1000 * 
-      ndn_BinaryXMLDecoder_bigEndianToUnsignedInt(interestLifetime, interestLifetimeLength) / 4096;
+    interest->interestLifetime = (int)(1000.0 * 
+      (double)ndn_BinaryXMLDecoder_bigEndianToUnsignedInt(interestLifetime, interestLifetimeLength) / 4096.0);
   }
   else
     interest->interestLifetime = -1;
@@ -81,4 +150,4 @@
     return error;
   
   return 0;
-}
\ No newline at end of file
+}