diff --git a/include/hexagram/pcapng.h b/include/hexagram/pcapng.h
index 278c588..b3d9dad 100644
--- a/include/hexagram/pcapng.h
+++ b/include/hexagram/pcapng.h
@@ -34,9 +34,10 @@ typedef struct _hexagram_pcapng_option {
  * pcapng block types and structure
  */
 typedef enum {
-    HEXAGRAM_PCAPNG_BLOCK_SECTION   = 0x0a0d0d0a,
-    HEXAGRAM_PCAPNG_BLOCK_INTERFACE = 0x1,
-    HEXAGRAM_PCAPNG_BLOCK_PACKET    = 0x6
+    HEXAGRAM_PCAPNG_BLOCK_SECTION  = 0x0a0d0d0a,
+    HEXAGRAM_PCAPNG_BLOCK_IF       = 0x1,
+    HEXAGRAM_PCAPNG_BLOCK_IF_STATS = 0x5,
+    HEXAGRAM_PCAPNG_BLOCK_PACKET   = 0x6
 } hexagram_pcapng_block_type;
 
 typedef struct _hexagram_pcapng_block_header {
@@ -80,11 +81,28 @@ typedef struct _hexagram_pcapng_section {
 #define HEXAGRAM_PCAPNG_OPTION_IF_FCSLEN      13
 #define HEXAGRAM_PCAPNG_OPTION_IF_TSOFFSET    14
 
-typedef struct _hexagram_pcapng_interface {
+typedef struct _hexagram_pcapng_if {
     uint16_t linktype,
              reserved;
     uint32_t snaplen;
-} hexagram_pcapng_interface;
+} hexagram_pcapng_if;
+
+/*
+ * pcapng interface statistics block structure
+ */
+#define HEXAGRAM_PCAPNG_OPTION_ISB_STARTTIME    2
+#define HEXAGRAM_PCAPNG_OPTION_ISB_ENDTIME      3
+#define HEXAGRAM_PCAPNG_OPTION_ISB_IFRECV       4
+#define HEXAGRAM_PCAPNG_OPTION_ISB_IFDROP       5
+#define HEXAGRAM_PCAPNG_OPTION_ISB_FILTERACCEPT 6
+#define HEXAGRAM_PCAPNG_OPTION_ISB_OSDROP       7
+#define HEXAGRAM_PCAPNG_OPTION_ISB_USRDELIV     8
+
+typedef struct _hexagram_pcapng_if_stats {
+    uint32_t if_id,
+             timestamp_high,
+             timestamp_low;
+} hexagram_pcapng_if_stats;
 
 /*
  * pcapng packet block structure
@@ -100,12 +118,21 @@ typedef struct _hexagram_pcapng_packet {
              origlen;
 } hexagram_pcapng_packet;
 
+/*
+ * pcapng stream reading facilities
+ */
+typedef struct _hexagram_pcapng_stream hexagram_pcapng_stream;
+
 typedef int (hexagram_pcapng_block_handler)(int fd,
                                             uint32_t type,
                                             size_t length);
 
+
+
 ssize_t hexagram_pcapng_stream_read(int fd,
                                     hexagram_pcapng_block_handler *handler,
                                     int *error);
 
+
+
 #endif /* _HEXAGRAM_PCAPNG_H */
diff --git a/src/pcapng.c b/src/pcapng.c
index 50917a6..910ef85 100644
--- a/src/pcapng.c
+++ b/src/pcapng.c
@@ -1,3 +1,4 @@
+#include <stdlib.h>
 #include <stdint.h>
 #include <fcntl.h>
 #include <unistd.h>
@@ -6,6 +7,29 @@
 
 #include <hexagram/pcapng.h>
 
+struct _hexagram_pcapng_stream {
+    int fd;
+    uint32_t if_count;
+    hexagram_pcapng_section  *section;
+    hexagram_pcapng_if       *ifs;
+    hexagram_pcapng_if_stats *stats;
+};
+
+hexagram_pcapng_stream *hexagram_pcapng_stream_open_fd(int fd) {
+    hexagram_pcapng_stream *stream;
+
+    if ((stream = malloc(sizeof(*stream))) == NULL) {
+        goto error_malloc_stream;
+    }
+
+    stream->if_count = 0;
+
+    return stream;
+
+error_malloc_stream:
+    return NULL;
+}
+
 ssize_t hexagram_pcapng_stream_read(fd, handler, error)
     int fd;
     hexagram_pcapng_block_handler *handler;