Break picture handling code from C++ to C.

This commit breaks the loading of images that were done in the divelist
into smaller bits. A bit of code refactor was done in order to correct the
placement of a few methods.

ShiftTimesDialog::EpochFromExiv got moved to Exif::epoch dive_add_picture
is now used instead of add_event picture_load_exif_data got implemented
using the old listview code.  dive_set_geodata_from_picture got
implemented using the old listview code.

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 147 insertions, 0 deletions

diff --git a/exif.h b/exif.h
new file mode 100644
index 000000000..0fb3a7d4a
--- /dev/null
+++ b/exif.h
@@ -0,0 +1,147 @@
+/**************************************************************************
+  exif.h  -- A simple ISO C++ library to parse basic EXIF
+	     information from a JPEG file.
+
+  Based on the description of the EXIF file format at:
+  -- http://park2.wakwak.com/~tsuruzoh/Computer/Digicams/exif-e.html
+  -- http://www.media.mit.edu/pia/Research/deepview/exif.html
+  -- http://www.exif.org/Exif2-2.PDF
+
+  Copyright (c) 2010-2013 Mayank Lahiri
+  mlahiri@gmail.com
+  All rights reserved.
+
+  VERSION HISTORY:
+  ================
+
+  2.1: Released July 2013
+	 -- fixed a bug where JPEGs without an EXIF SubIFD would not be parsed
+	 -- fixed a bug in parsing GPS coordinate seconds
+	 -- fixed makefile bug
+	 -- added two pathological test images from Matt Galloway
+	  http://www.galloway.me.uk/2012/01/uiimageorientation-exif-orientation-sample-images/
+	 -- split main parsing routine for easier integration into Firefox
+
+  2.0: Released February 2013
+	 -- complete rewrite
+	 -- no new/delete
+	 -- added GPS support
+
+  1.0: Released 2010
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+  -- Redistributions of source code must retain the above copyright notice,
+     this list of conditions and the following disclaimer.
+  -- Redistributions in binary form must reproduce the above copyright notice,
+     this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY EXPRESS
+   OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+   NO EVENT SHALL THE FREEBSD PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+   BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+   OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+   EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+#ifndef EXIF_H
+#define EXIF_H
+
+#include <string>
+
+//
+// Class responsible for storing and parsing EXIF information from a JPEG blob
+//
+class EXIFInfo {
+public:
+	// Parsing function for an entire JPEG image buffer.
+	//
+	// PARAM 'data': A pointer to a JPEG image.
+	// PARAM 'length': The length of the JPEG image.
+	// RETURN:  PARSE_EXIF_SUCCESS (0) on succes with 'result' filled out
+	//          error code otherwise, as defined by the PARSE_EXIF_ERROR_* macros
+	int parseFrom(const unsigned char *data, unsigned length);
+	int parseFrom(const std::string &data);
+
+	// Parsing function for an EXIF segment. This is used internally by parseFrom()
+	// but can be called for special cases where only the EXIF section is
+	// available (i.e., a blob starting with the bytes "Exif\0\0").
+	int parseFromEXIFSegment(const unsigned char *buf, unsigned len);
+
+	// Set all data members to default values.
+	void clear();
+
+	// Data fields filled out by parseFrom()
+	char ByteAlign;			  // 0 = Motorola byte alignment, 1 = Intel
+	std::string ImageDescription;     // Image description
+	std::string Make;		  // Camera manufacturer's name
+	std::string Model;		  // Camera model
+	unsigned short Orientation;       // Image orientation, start of data corresponds to
+					  // 0: unspecified in EXIF data
+					  // 1: upper left of image
+					  // 3: lower right of image
+					  // 6: upper right of image
+					  // 8: lower left of image
+					  // 9: undefined
+	unsigned short BitsPerSample;     // Number of bits per component
+	std::string Software;		  // Software used
+	std::string DateTime;		  // File change date and time
+	std::string DateTimeOriginal;     // Original file date and time (may not exist)
+	std::string DateTimeDigitized;    // Digitization date and time (may not exist)
+	std::string SubSecTimeOriginal;   // Sub-second time that original picture was taken
+	std::string Copyright;		  // File copyright information
+	double ExposureTime;		  // Exposure time in seconds
+	double FNumber;			  // F/stop
+	unsigned short ISOSpeedRatings;   // ISO speed
+	double ShutterSpeedValue;	 // Shutter speed (reciprocal of exposure time)
+	double ExposureBiasValue;	 // Exposure bias value in EV
+	double SubjectDistance;		  // Distance to focus point in meters
+	double FocalLength;		  // Focal length of lens in millimeters
+	unsigned short FocalLengthIn35mm; // Focal length in 35mm film
+	char Flash;			  // 0 = no flash, 1 = flash used
+	unsigned short MeteringMode;      // Metering mode
+					  // 1: average
+					  // 2: center weighted average
+					  // 3: spot
+					  // 4: multi-spot
+					  // 5: multi-segment
+	unsigned ImageWidth;		  // Image width reported in EXIF data
+	unsigned ImageHeight;		  // Image height reported in EXIF data
+	struct Geolocation_t
+	{			  // GPS information embedded in file
+		double Latitude;  // Image latitude expressed as decimal
+		double Longitude; // Image longitude expressed as decimal
+		double Altitude;  // Altitude in meters, relative to sea level
+		char AltitudeRef; // 0 = above sea level, -1 = below sea level
+		struct Coord_t {
+			double degrees;
+			double minutes;
+			double seconds;
+			char direction;
+		} LatComponents, LonComponents; // Latitude, Longitude expressed in deg/min/sec
+	} GeoLocation;
+	EXIFInfo()
+	{
+		clear();
+	}
+
+	time_t epoch();
+};
+
+// Parse was successful
+#define PARSE_EXIF_SUCCESS 0
+// No JPEG markers found in buffer, possibly invalid JPEG file
+#define PARSE_EXIF_ERROR_NO_JPEG 1982
+// No EXIF header found in JPEG file.
+#define PARSE_EXIF_ERROR_NO_EXIF 1983
+// Byte alignment specified in EXIF file was unknown (not Motorola or Intel).
+#define PARSE_EXIF_ERROR_UNKNOWN_BYTEALIGN 1984
+// EXIF header was found, but data was corrupted.
+#define PARSE_EXIF_ERROR_CORRUPT 1985
+
+#endif // EXIF_H