[patch] Pentax raw file suport

diff -ruN gqview-2.1.4/src/filelist.c gqview-2.1.4-pentax/src/filelist.c
--- gqview-2.1.4/src/filelist.c	2006-10-19 11:50:36.000000000 +0200
+++ gqview-2.1.4-pentax/src/filelist.c	2006-11-07 14:56:13.000000000 +0100
@@ -215,6 +215,7 @@
 	filter_add_if_missing("crw", "Canon raw format", ".crw;.cr2", TRUE);
 	filter_add_if_missing("raf", "Fujifilm raw format", ".raf", TRUE);
 	filter_add_if_missing("nef", "Nikon raw format", ".nef", TRUE);
+	filter_add_if_missing("pef", "Pentax raw format", ".pef", TRUE);
 }
 
 static GList *filter_to_list(const gchar *extensions)
diff -ruN gqview-2.1.4/src/format_pentax.c gqview-2.1.4-pentax/src/format_pentax.c
--- gqview-2.1.4/src/format_pentax.c	1970-01-01 01:00:00.000000000 +0100
+++ gqview-2.1.4-pentax/src/format_pentax.c	2006-11-07 14:56:13.000000000 +0100
@@ -0,0 +1,157 @@
+/*
+ *  GQView
+ *  (C) 2005 John Ellis
+ *
+ *  Authors:
+ *    Raw NEF jpeg extraction based on nefextract.c by Joseph Heled,
+ *        in addition nefextract.c is based on dcraw by Dave Coffin.
+ *
+ * This software is released under the GNU General Public License (GNU GPL).
+ * Please read the included file COPYING for more information.
+ * This software comes with no warranty of any kind, use at your own risk!
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <glib.h>
+
+#include "intl.h"
+
+#include "format_pentax.h"
+
+#include "exif.h"
+
+
+/*
+ *-----------------------------------------------------------------------------
+ * Raw PEF embedded jpeg extraction for Pentax
+ *-----------------------------------------------------------------------------
+ */
+
+static guint pentax_tiff_table(unsigned char *data, const guint len, guint offset, ExifByteOrder bo,
+			      gint level,
+			      guint *image_offset, guint *jpeg_len);
+
+
+static void pentax_tiff_entry(unsigned char *data, const guint len, guint offset, ExifByteOrder bo,
+			     gint level,
+			     guint *image_offset, guint *image_length, guint *jpeg_start, guint *jpeg_len)
+{
+	guint tag;
+	guint type;
+	guint count;
+	guint segment;
+	guint seg_len;
+
+	tag = exif_byte_get_int16(data + offset + EXIF_TIFD_OFFSET_TAG, bo);
+	type = exif_byte_get_int16(data + offset + EXIF_TIFD_OFFSET_FORMAT, bo);
+	count = exif_byte_get_int32(data + offset + EXIF_TIFD_OFFSET_COUNT, bo);
+
+	/* so far, we only care about tags with type long */
+	if (type != EXIF_FORMAT_LONG_UNSIGNED && type != EXIF_FORMAT_LONG) return;
+
+	seg_len = ExifFormatList[type].size * count;
+	if (seg_len > 4)
+		{
+		segment = exif_byte_get_int32(data + offset + EXIF_TIFD_OFFSET_DATA, bo);
+		if (segment + seg_len > len) return;
+		}
+	else
+		{
+		segment = offset + EXIF_TIFD_OFFSET_DATA;
+		}
+
+	if (tag == 0x14a)
+		{
+		/* sub IFD table */
+		gint i;
+
+		for (i = 0; i < count; i++)
+			{
+			guint subset;
+
+			subset = exif_byte_get_int32(data + segment + i * 4, bo);
+			pentax_tiff_table(data, len, subset, bo, level + 1, image_offset, image_length);
+			}
+
+		}
+	else if (tag == 0x201)
+		{
+		/* jpeg data start offset */
+		*jpeg_start = exif_byte_get_int32(data + segment, bo);
+		}
+	else if (tag == 0x202)
+		{
+		/* jpeg data length */
+		*jpeg_len = exif_byte_get_int32(data + segment, bo);
+		}
+}
+
+static guint pentax_tiff_table(unsigned char *data, const guint len, guint offset, ExifByteOrder bo,
+			      gint level,
+			      guint *image_offset, guint *image_length)
+{
+	guint count;
+	guint i;
+	guint jpeg_start = 0;
+	guint jpeg_len = 0;
+
+	/* limit damage from infinite loops */
+	if (level > EXIF_TIFF_MAX_LEVELS) return 0;
+
+	if (len < offset + 2) return FALSE;
+
+	count = exif_byte_get_int16(data + offset, bo);
+	offset += 2;
+	if (len < offset + count * EXIF_TIFD_SIZE + 4) return 0;
+
+	for (i = 0; i < count; i++)
+		{
+		pentax_tiff_entry(data, len, offset + i * EXIF_TIFD_SIZE, bo, level,
+				 image_offset, image_length, &jpeg_start, &jpeg_len);
+		}
+
+	if (jpeg_start > 0 &&
+	    jpeg_len > *image_length)
+		{
+		*image_offset = jpeg_start;
+		*image_length = jpeg_len;
+		}
+
+	return exif_byte_get_int32(data + offset + count * EXIF_TIFD_SIZE, bo);
+}
+
+gint format_pentax_raw(unsigned char *data, const guint len,
+		      guint *image_offset, guint *exif_offset)
+{
+	guint i_off = 0;
+	guint i_len = 0;
+	ExifByteOrder bo;
+	guint offset;
+	gint level;
+
+	if (!exif_tiff_directory_offset(data, len, &offset, &bo)) return FALSE;
+
+	level = 0;
+	while (offset && level < EXIF_TIFF_MAX_LEVELS)
+		{
+		offset = pentax_tiff_table(data, len, offset, bo, 0, &i_off, &i_len);
+		level++;
+		}
+
+	if (i_off != 0)
+		{
+		if (image_offset) *image_offset = i_off;
+		return TRUE;
+		}
+
+	return FALSE;
+}
+
diff -ruN gqview-2.1.4/src/format_pentax.h gqview-2.1.4-pentax/src/format_pentax.h
--- gqview-2.1.4/src/format_pentax.h	1970-01-01 01:00:00.000000000 +0100
+++ gqview-2.1.4-pentax/src/format_pentax.h	2006-11-07 14:56:13.000000000 +0100
@@ -0,0 +1,24 @@
+/*
+ *  GQView
+ *  (C) 2005 John Ellis
+ *
+ * This software is released under the GNU General Public License (GNU GPL).
+ * Please read the included file COPYING for more information.
+ * This software comes with no warranty of any kind, use at your own risk!
+ */
+
+#ifndef __FORMAT_PENTAX_H
+#define __FORMAT_PENTAX_H
+
+
+#include "exif.h"
+
+gint format_pentax_raw(unsigned char *data, const guint len,
+		      guint *image_offset, guint *exif_offset);
+
+#define FORMAT_RAW_PENTAX { "pef", \
+			   FORMAT_RAW_MATCH_MAGIC, 242, "PENTAX Corporation", 18, \
+			   "Pentax raw", format_pentax_raw }
+
+#endif
+
diff -ruN gqview-2.1.4/src/format_raw.c gqview-2.1.4-pentax/src/format_raw.c
--- gqview-2.1.4/src/format_raw.c	2005-06-13 01:25:08.000000000 +0200
+++ gqview-2.1.4-pentax/src/format_raw.c	2006-11-07 14:56:13.000000000 +0100
@@ -31,6 +31,7 @@
 #include "format_canon.h"
 #include "format_fuji.h"
 #include "format_nikon.h"
+#include "format_pentax.h"
 #include "format_olympus.h"
 
 
@@ -53,6 +54,7 @@
 	FORMAT_RAW_CANON,
 	FORMAT_RAW_FUJI,
 	FORMAT_RAW_NIKON,
+	FORMAT_RAW_PENTAX,
 	{ NULL, 0, 0, NULL, 0, NULL, NULL }
 };
 
diff -ruN gqview-2.1.4/src/Makefile.am gqview-2.1.4-pentax/src/Makefile.am
--- gqview-2.1.4/src/Makefile.am	2005-06-10 19:10:14.000000000 +0200
+++ gqview-2.1.4-pentax/src/Makefile.am	2006-11-07 14:56:13.000000000 +0100
@@ -90,6 +90,8 @@
 	format_fuji.h	\
 	format_nikon.c	\
 	format_nikon.h	\
+	format_pentax.c	\
+	format_pentax.h	\
 	format_olympus.c	\
 	format_olympus.h	\
 	format_raw.c	\
diff -ruN gqview-2.1.4/src/Makefile.in gqview-2.1.4-pentax/src/Makefile.in
--- gqview-2.1.4/src/Makefile.in	2006-11-04 23:14:39.000000000 +0100
+++ gqview-2.1.4-pentax/src/Makefile.in	2006-11-07 14:56:13.000000000 +0100
@@ -60,7 +60,7 @@
 	collect-table.$(OBJEXT) dnd.$(OBJEXT) dupe.$(OBJEXT) \
 	editors.$(OBJEXT) exif.$(OBJEXT) filelist.$(OBJEXT) \
 	format_canon.$(OBJEXT) format_fuji.$(OBJEXT) \
-	format_nikon.$(OBJEXT) format_olympus.$(OBJEXT) \
+	format_nikon.$(OBJEXT) format_pentax.$(OBJEXT) format_olympus.$(OBJEXT) \
 	format_raw.$(OBJEXT) fullscreen.$(OBJEXT) globals.$(OBJEXT) \
 	image.$(OBJEXT) image-load.$(OBJEXT) image-overlay.$(OBJEXT) \
 	img-view.$(OBJEXT) info.$(OBJEXT) layout.$(OBJEXT) \
@@ -270,6 +270,8 @@
 	format_fuji.h	\
 	format_nikon.c	\
 	format_nikon.h	\
+	format_pentax.c	\
+	format_pentax.h	\
 	format_olympus.c	\
 	format_olympus.h	\
 	format_raw.c	\