diff --git a/src/obicolumn.h b/src/obicolumn.h
new file mode 100644
index 0000000..dedc731
--- /dev/null
+++ b/src/obicolumn.h
@@ -0,0 +1,47 @@
+/****************************************************************************
+ * OBIColumn header file                                                    *
+ ****************************************************************************/
+
+/**
+ * @file obicolumn.h
+ * @author Celine Mercier
+ * @date 12 May 2015
+ * @brief Header file for the shared elements of all the OBIColumn structures.
+ */
+
+#ifndef OBICOLUMN_H_
+#define OBICOLUMN_H_
+
+#include <stdio.h>
+
+
+/**
+ * @brief enum OBIDataType for the data type of the OBIColumns.
+ */
+
+typedef enum OBIDataType {
+	OBI_VOID    = 0,     		/**< data type not specified */
+	OBI_INT32,					/**< type int32_t */
+	OBI_INT64,					/**< type int64_t */
+	OBI_UINT32,					/**< type uint32_t */
+	OBI_UNIT64,					/**< type uint64_t */
+	OBI_STRING					/**< type char* */
+} OBIDataType_t, *OBIDataType_p;
+
+
+/**
+ * @brief OBIColumnHeader structure.
+ */
+
+typedef struct OBIColumnHeader {
+	bool			endyan_byte_order;		/**< endyan byte order */
+	int				header_size_value;		/**< size of the header: a multiple of PAGESIZE */
+	int				line_count;				/**< number of lines of data */
+	OBIDataType_t	data_type;				/**< type of the data */
+	char*			creation_date;			/**< date of creation of the file */
+	int				version;				/**< version of the OBIColumn */
+	char*			comments;				/**< comments */>
+} OBIIntColumn_t, *OBIIntColumn_p;
+
+
+#endif /* OBICOLUMN_H_ */
diff --git a/src/obiintcolumn.h b/src/obiintcolumn.h
index 0fb6804..9a380e6 100644
--- a/src/obiintcolumn.h
+++ b/src/obiintcolumn.h
@@ -1,5 +1,5 @@
 /****************************************************************************
- * OBIIntColumn prototype file                                              *
+ * OBIIntColumn header file                                                 *
  ****************************************************************************/
  
 /**
@@ -13,35 +13,69 @@
 #define OBIINTCOLUMN_H_
  
 #include <stdio.h>
+#include <stdlib.h>
+
+#include "obicolumn.h"
 
 
 /**
- * @brief enum for the OBIDataType.
+ * @brief OBIIntColumn stucture.
  */
- 
-typedef enum OBIDataType {
-	OBI_VOID    = 0,     		/**< data type not specified */
-	OBI_INT32,					/**< type int32_t */
-	OBI_INT64,					/**< type int64_t */
-	OBI_UINT32,					/**< type uint32_t */
-	OBI_UNIT64,					/**< type uint64_t */
-	OBI_STRING					/**< type str */
-} OBIDataType_t, *OBIDataType_p;
 
+typedef struct OBIIntcolumn {
+
+} OBIIntColumn_t, *OBIIntColumn_p;
 
 /**
- * @brief Bried description of the function.
+ * @brief Reads a memory block from an OBIIntColumn file.
  *
- * Longer description of the function. This part may refer to the parameters
- * of the function, like @p parameter.
- * @param parameter Description of the first parameter of the function.
- * @return Describe what the function returns.
- * @see http://website/
- * @note Something to note.
- * @warning Warning.
+ * @param OBIIntColumn The OBIColumn that should be read.
+ * @return A pointer on the first element of the block.
  */
 
-void test(int parameter);
+int* readMemoryBlock(int* OBIIntcolumn, int startingPosition, int memoryBlockSize);
+
+
+/**
+ * @brief Writes a memory block line by line at the end of a file.
+ */
+
+void writeMemoryBlock(int* OBIIntcolumn, int memoryBlockSize, char* fileName);
+
+
+/**
+ * @brief Returns one line of an OBIColumn.
+ */
+
+int readLine(int line);
+
+
+/**
+ * @brief Creates a new file for a new version of the OBIColumn.
+ */
+
+void newColumn(OBIIntcolumn* column);
+
+
+/**
+ * @brief malloc for OBIIntColumn.
+ */
+
+int* OBIIntMalloc();
+
+
+/**
+ * @brief realloc for OBIIntColumn.
+ */
+
+int* OBIIntRealloc();
+
+
+/**
+ * @brief free for OBIIntColumn.
+ */
+
+void OBIIntFree();
 
 
 #endif /* OBIINTCOLUMN_H_ */