A very basic obicount

src/obidmscolumn.h

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+/****************************************************************************
+ * OBIDMSColumn header file                                                    *
+ ****************************************************************************/
+
+/**
+ * @file obidmscolumn.h
+ * @author Celine Mercier
+ * @date 12 May 2015
+ * @brief Header file for the shared elements of all the OBIColumn structures.
+ */
+
+#ifndef OBIDMSCOLUMN_H_
+#define OBIDMSCOLUMN_H_
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdbool.h>
+
+#include "obitypes.h"
+
+/**
+ * @brief Value separator in OBIDMSColumn files.
+ */
+static const char SEPARATOR = '\n';
+
+
+/**
+ * @brief Header size in OBIDMSColumn files.
+ */
+static const int HEADER_SIZE = 4096;
+
+
+/**
+ * @brief Number of bytes to map
+ */
+static const int BUFFER_SIZE = 4;
+
+
+/**
+ * @brief OBIColumnHeader structure.
+ */
+
+typedef struct OBIDMSColumnHeader {
+	bool			endyan_byte_order;		/**< endyan byte order */
+	int				header_size_value;		/**< size of the header: a multiple of PAGESIZE */
+	bool			file_status;			/**< file status : 0 is Open and 1 is Closed */
+	pid_t			PID;					/**< PID of the process that created the file and is
+												 the only one allowed to modify it if it is open */
+	int				line_count;				/**< number of lines of data */
+	OBIType_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 */
+} OBIDMSColumnHeader_t, *OBIDMSColumnHeader_p;
+
+
+char* obi_map_read_only(int file, int start, int size);
+
+void obi_unmap(int size);
+
+
+#endif /* OBIDMSCOLUMN_H_ */