From a22163cbe74e267bbe307c39c815dbb781acc83a Mon Sep 17 00:00:00 2001
From: FreeArtMan <dos21h@gmail.com>
Date: Tue, 21 May 2019 22:21:21 +0100
Subject: Added buffer check function

---
 netbytes.c | 33 +++++++++++++++++++++++++++++++++
 netbytes.h | 10 ++++++++++
 2 files changed, 43 insertions(+)

diff --git a/netbytes.c b/netbytes.c
index 1f8433b..3a6dc0a 100644
--- a/netbytes.c
+++ b/netbytes.c
@@ -690,6 +690,7 @@ int nb_type( netbyte_store *store, int count, __NBT_TYPED **type )
 
 	//nbt = (__NBT_TYPED)store->types[count].type; //warnign? who cares
 	//*type = nbt;
+	#warning "Looks like real error"
 	*type = store->types[count].type;
 	return 0;
 }
@@ -762,6 +763,38 @@ int nb_fread( netbyte_store *store, int fd)
 	return 0;
 }
 
+
+/*
+Return:
+	1 - looks like data are netbyte buffer
+	0 - data isnot netbyte buffer
+*/
+int nb_check_buf(uint8_t *data, int len, int *detected_size)
+{
+	__NBT_SIZE size;
+	if (len < sizeof(__NBT_SIZE))
+	{
+		printf("if (len > sizeof(__NBT_SIZE))\n");
+		return 0;
+	}
+
+	memcpy(&size, data, sizeof(__NBT_SIZE));
+
+	if (len<size)
+	{
+		printf("if (len<size)\n");
+		return 0;
+	}
+
+	//amount of data that are netbyte in buffer
+	*detected_size = size;
+
+	return 1;
+	//TODO find start byte for data in netbyte buffer
+	
+}
+
+
 int nb_print(netbyte_store *store)
 {
 	int i;
diff --git a/netbytes.h b/netbytes.h
index 6e008bc..685b68a 100644
--- a/netbytes.h
+++ b/netbytes.h
@@ -1,6 +1,10 @@
 #ifndef __NETBYTES_H
 #define __NETBYTES_H
 
+#ifdef __cplusplus
+extern "C"  {
+#endif
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <stdint.h>
@@ -167,6 +171,8 @@ int nb_count( netbyte_store *store );
 int nb_type(  netbyte_store *store, int count, __NBT_TYPED **type );
 int nb_val(   netbyte_store *store, int count, __nb_type **type );
 int nb_fread( netbyte_store *store, int fd);
+/*check if data may contain full netbyte buffer*/
+int nb_check_buf(uint8_t *data, int len, int *detected_size);
 
 //print all all values in netbyte string
 int nb_print(netbyte_store *store);
@@ -188,4 +194,8 @@ void nb_tok_destroy(nb_tok_arr *arr);
 
 int nb_parse(char *str, nb_tok_arr *arr);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif
\ No newline at end of file
-- 
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