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diff --git a/include/im_file.h b/include/im_file.h
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+/** \file
+ * \brief File Access
+ *
+ * See Copyright Notice in im_lib.h
+ */
+
+#ifndef __IM_FILE_H
+#define __IM_FILE_H
+
+#include "im.h"
+
+#if	defined(__cplusplus)
+extern "C" {
+#endif
+
+
+/** \defgroup filesdk File Format SDK
+ * \par
+ * All the file formats are based on theses structures. Use them to create new file formats. \n
+ * The LineBuffer functions will help transfer image from format buffer to application buffer and vice-versa.
+ * \par
+ * See \ref im_file.h
+ * \ingroup file */
+
+
+/** \brief Image File Format Base (SDK Use Only)
+ *
+ * \par
+ * Base container to hold format independent state variables.
+ * \ingroup filesdk */
+struct _imFile
+{
+  int is_new;
+  void* attrib_table;    /**< in fact is a imAttribTable, but we hide this here */
+
+  void* line_buffer;     /**< used for line convertion, contains all components if packed, or only one if not */
+  int line_buffer_size;
+  int line_buffer_extra; /**< extra bytes to be allocated */
+  int line_buffer_alloc; /**< total allocated so far */
+  int counter;
+
+  int convert_bpp;       /**< number of bpp to unpack/pack to/from 1 byte. 
+                              When reading converts n packed bits to 1 byte (unpack). If n>1 will also expand to 0-255. 
+                              When writing converts 1 byte to 1 bit (pack). 
+                              If negative will only expand to 0-255 (no unpack or pack). */
+  int switch_type;       /**< flag to switch the original data type: char-byte, short-ushort, uint-int, double-float */
+
+  long palette[256];
+  int palette_count;
+
+  int user_color_mode,
+      user_data_type,
+      file_color_mode,   /* these two must be filled by te driver always. */
+      file_data_type;
+
+  /* these must be filled by the driver when reading,
+     and given by the user when writing. */
+
+  char compression[10];
+  int image_count,
+      image_index,
+      width,           
+      height;
+};
+
+
+/* Internal Use only */
+
+/* Initializes the imFile structure.
+ * Used by the special format RAW. */
+void imFileClear(imFile* ifile);
+
+/* Initializes the line buffer.
+ * Used by "im_file.cpp" only. */
+void imFileLineBufferInit(imFile* ifile);
+
+/* Check if the conversion is valid.
+ * Used by "im_file.cpp" only. */
+int imFileCheckConversion(imFile* ifile);
+
+
+
+/* File Format SDK */
+
+/** Number of lines to be accessed.
+ * \ingroup filesdk */
+int imFileLineBufferCount(imFile* ifile);
+
+/** Increments the row and plane counters.
+ * \ingroup filesdk */
+void imFileLineBufferInc(imFile* ifile, int *row, int *plane);
+
+/** Converts from FILE color mode to USER color mode.
+ * \ingroup filesdk */
+void imFileLineBufferRead(imFile* ifile, void* data, int line, int plane);
+
+/** Converts from USER color mode to FILE color mode.
+ * \ingroup filesdk */
+void imFileLineBufferWrite(imFile* ifile, const void* data, int line, int plane);
+
+/** Utility to calculate the line size in byte with a specified alignment. \n
+ * "align" can be 1, 2 or 4.
+ * \ingroup filesdk */
+int imFileLineSizeAligned(int width, int bpp, int align);
+
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif