diff --git a/dynarrc/common.h b/dynarrc/common.h
index 7bd9c6e..f4c5c1e 100644
--- a/dynarrc/common.h
+++ b/dynarrc/common.h
@@ -1,6 +1,9 @@
 #ifndef __dynarr_common_h__
 #define __dynarr_common_h__
 
+// mark different regions of the code
+#define _REGION_ 1
+
 /* for token-pasting and string concatenation */
 #define MACRO_EVAL2(x) (x)
 #define MACRO_EVAL(x) MACRO_EVAL2(x)
@@ -51,4 +54,10 @@
 #define SIZE_ARR(a)  ( ((a)!=NULL) ? sizeof(a) / sizeof((a)[0]) : 0)
 
 
+// max nodes
+#define MAXSEG MaxSeg
+#define LOG_MAXSEG LogMaxSeg
+#define MAXSEG_REMAINDER_BITMASK MaxSegRemainderBitMask
+
+
 #endif // __dynarr_common_h__
\ No newline at end of file
diff --git a/dynarrc/dynarr.c b/dynarrc/dynarr.c
index 06ac2cb..7dc5ae8 100644
--- a/dynarrc/dynarr.c
+++ b/dynarrc/dynarr.c
@@ -1,33 +1,11 @@
+/**/
 #include "common.h"
-#include <stdio.h>
-#include <stdlib.h>
-
-#define MAXSEG 5
-#define DYNARR_TYPE int
-#define TYPED_NAME( name ) TOKEN_PASTE(DYNARR_TYPE, name)
-#include "dynarr.h"
-typedef struct TYPED_NAME(DynArr) IdArr;
-
-
-#define DYNARR_TYPE float
-#define TYPED_NAME( name ) TOKEN_PASTE(DYNARR_TYPE, name)
-#include "dynarr.h"
-typedef struct TYPED_NAME(DynArr) ValueArr;
-
-
-int main(int argc, char** argv){
-	MEM_LEAK_CATCH();
-
-	IdArr		*p1;
-	ValueArr	*p2;
-
-	p1 = (IdArr*)malloc(sizeof(IdArr));
-	p2 = (ValueArr*)malloc(sizeof(ValueArr));
-
-
-	// done
-	FREE_SAFE(p1);
-	FREE_SAFE(p2);
-	MEM_LEAK_SHOW();
-	return 0;
-}
\ No newline at end of file
+#define EXTERN
+
+/* Some global variables used externally */
+/*	Maximum number of segments allowed to be in the system. Must be a power of 2 */
+EXTERN unsigned int		MaxSeg;		
+/*	Base-2 log */
+EXTERN unsigned int		LogMaxSeg; 
+/* MAXSEG-1; MAXSEG must be a power of 2 */
+EXTERN unsigned int		MaxSegRemainderBitMask;	
diff --git a/dynarrc/dynarr.h b/dynarrc/dynarr.h
index 7d214d3..47a0b94 100644
--- a/dynarrc/dynarr.h
+++ b/dynarrc/dynarr.h
@@ -16,8 +16,62 @@
 #pragma message("DYNARR_TYPE must be defined before including " __FILE__)
 #else
 // everything is fine
+#include "dynarr_freenodelist.h"
+// declarations
+// swap two integers, or pointers, without using temporary storage
+__inline void int_swap(unsigned int *var1, unsigned int *var2)	{
+	(*var1) = (*var1) ^ (*var2);
+	(*var2) = (*var1) ^ (*var2);
+	(*var1) = (*var1) ^ (*var2);
+}
+// external definitions for allocating/resizing blocks
+extern int seg_bank_alloc_next();
+extern int seg_bank_increase_max();
+
+
+
+#define SEG_ARR_NAME				pSegArr
+#define FREESEG_LIST_NAME			pFreeSegList
+#define FREESEG_INVALID_LIST_NAME	pFreeSegInvalidList
+
+#define SEG_INSERT_POS				iInsertPos
+
+#define EMPTY_INDEX		0
+#define EMPTY_BYTE		0
+#define NULL_SEG	emptySeg
+#define SEG_INSERT_POS_BEGIN	1
+
+// Node blocks
+#if _REGION_
+// maximum number of segment banks
+// this should be a very big number
+// this number should never be reached
+#define MAX_SEG_BANKS		INT_MAX
+
+// array containing size (# of segments) of each segment bank
+#define SEG_BANK_SIZE_ARR	pSegBankSizeArr
+
+// array containing last valid index of each segment bank
+#define SEG_BANK_INDEX_LIMIT_ARR	pSegBankIndexLimitArr
+
+// Number of active segment banks
+#define NUM_SEG_BANKS		NumSegBanks
+#define CURRENT_SEG_BANK	(NUM_SEG_BANKS - 1)
+// actual segment banks
+#define SEG_BANKS_ARR		pSegBanksArr
+
+// coordinates in the 2-D segment allocation
+#define BANK_INDEX_FROM_SEG_INDEX(index)	\
+	( ((unsigned int)(index)) >> LOG_MAXSEG )
+
+#define BANK_FROM_SEG_INDEX(index)	SEG_BANKS_ARR[BANK_INDEX_FROM_SEG_INDEX(index)]
+#define SLOT_FROM_SEG_INDEX(index)	(((unsigned int)(index)) & MAXSEG_REMAINDER_BITMASK)
+
+// pointer to the segment
+#define PTR_SEG_FROM_INDEX(index)	\
+	(BANK_FROM_SEG_INDEX(index) + NUM_SEG_MEMBERS_IN_ARR * SLOT_FROM_SEG_INDEX(index) )
+#endif
 
-// prefixing
 
 /* The dynamic array data structure */
 struct TYPED_NAME(DynArr){
diff --git a/dynarrc/dynarr_freenodelist.h b/dynarrc/dynarr_freenodelist.h
new file mode 100644
index 0000000..dfeabd4
--- /dev/null
+++ b/dynarrc/dynarr_freenodelist.h
@@ -0,0 +1,11 @@
+#ifndef __dynarr_free_node_list_h__
+#define __dynarr_free_node_list_h__
+
+// the struct FreeSegNode will be used multiple times, so we do not want to redefine it
+struct FreeSegNode{
+	int index;
+	struct FreeSegNode* next;
+};
+typedef struct FreeSegNode FreeSegNode;
+
+#endif
\ No newline at end of file
diff --git a/dynarrc/main.c b/dynarrc/main.c
new file mode 100644
index 0000000..06ac2cb
--- /dev/null
+++ b/dynarrc/main.c
@@ -0,0 +1,33 @@
+#include "common.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+#define MAXSEG 5
+#define DYNARR_TYPE int
+#define TYPED_NAME( name ) TOKEN_PASTE(DYNARR_TYPE, name)
+#include "dynarr.h"
+typedef struct TYPED_NAME(DynArr) IdArr;
+
+
+#define DYNARR_TYPE float
+#define TYPED_NAME( name ) TOKEN_PASTE(DYNARR_TYPE, name)
+#include "dynarr.h"
+typedef struct TYPED_NAME(DynArr) ValueArr;
+
+
+int main(int argc, char** argv){
+	MEM_LEAK_CATCH();
+
+	IdArr		*p1;
+	ValueArr	*p2;
+
+	p1 = (IdArr*)malloc(sizeof(IdArr));
+	p2 = (ValueArr*)malloc(sizeof(ValueArr));
+
+
+	// done
+	FREE_SAFE(p1);
+	FREE_SAFE(p2);
+	MEM_LEAK_SHOW();
+	return 0;
+}
\ No newline at end of file