easyexif
========

A tiny ISO-compliant C++ EXIF parsing library.

EasyEXIF is a tiny, lightweight C++ library that parses basic information out of EXIF files. It uses only the std::string library and is otherwise pure C++. You pass it the the binary contents of an entire JPEG file, and it parses out a few of the most important EXIF fields for you.

Why use this library? __Include one .h file, compile one .cc file, and that's it.__

Sometimes you just need to quickly extract basic information from a JPEG file's EXIF headers: the time the image was taken (not the file timestamp, the camera's internal time), the F-stop or exposure time, GPS information embedded in the EXIF file, what the camera make and model was, etc. Unfortunately, all the EXIF libraries out there are not very lightweight or easy to integrate into larger programs. EasyEXIF aims to solve that problem, and is released under a very liberal BSD License for use practically anywhere.

### Features:

  1. Supports common Exif fields including GPS, ISO speed, etc.
  2. Extensively documented in the source.
  3. Valgrind tested for memory leaks.
  4. Handles corrupt JPEGs.
  5. Compiles without complaints using `-Wall -Wextra -Werror -pedantic -ansi` on gcc v4.8.2
  6. No uses of new/malloc.

### License

BSD.

### Contributions

Reasonable pull requests are gladly accepted.

The following people have committed patches to EasyExif.

  * Tomas Volf
  * Seth Fowler
  * Val Malykh
  * Carlos Apablaza Brito
  * Simon Fuhrmann
  * Toshiaki Ohkuma
  * pet.b.hunt
  * Jason Moey


### Example:


```C++
  #include "exif.h"

  EXIFInfo result;
  result.parseFrom(JPEGFileBuffer, BufferSize);

  printf("Camera make       : %s\n", result.Make.c_str());
  printf("Camera model      : %s\n", result.Model.c_str());
  printf("Software          : %s\n", result.Software.c_str());
  printf("Bits per sample   : %d\n", result.BitsPerSample);
  printf("Image width       : %d\n", result.ImageWidth);
  printf("Image height      : %d\n", result.ImageHeight);
  printf("Image description : %s\n", result.ImageDescription.c_str());
  printf("Image orientation : %d\n", result.Orientation);
  printf("Image copyright   : %s\n", result.Copyright.c_str());
  printf("Image date/time   : %s\n", result.DateTime.c_str());
  printf("Original date/time: %s\n", result.DateTimeOriginal.c_str());
  printf("Digitize date/time: %s\n", result.DateTimeDigitized.c_str());
  printf("Subsecond time    : %s\n", result.SubSecTimeOriginal.c_str());
  printf("Exposure time     : 1/%d s\n", (unsigned) (1.0/result.ExposureTime));
  printf("F-stop            : f/%.1f\n", result.FNumber);
  printf("ISO speed         : %d\n", result.ISOSpeedRatings);
  printf("Subject distance  : %f m\n", result.SubjectDistance);
  printf("Exposure bias     : %f EV\n", result.ExposureBiasValue);
  printf("Flash used?       : %d\n", result.Flash);
  printf("Metering mode     : %d\n", result.MeteringMode);
  printf("Lens focal length : %f mm\n", result.FocalLength);
  printf("35mm focal length : %u mm\n", result.FocalLengthIn35mm);
  printf("GPS Latitude      : %f deg\n", result.GeoLocation.Latitude);
  printf("GPS Longitude     : %f deg\n", result.GeoLocation.Longitude);
  printf("GPS Altitude      : %f m\n", result.GeoLocation.Altitude);
```
