evaluate some nikon specific flash info

2 files changed, 88 insertions, 5 deletions

diff --git a/src/exif.c b/src/exif.c
index 9d26072..19b75f4 100644
--- a/src/exif.c
+++ b/src/exif.c
@@ -33,7 +33,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include "options.h"
 #include "debug.h"
 #include "exif.h"
-
+#include "exif_nikon.h"
 
 
 /* remove all spaces on the right end of a string */
@@ -140,7 +140,10 @@ ExifData * exif_get_data(char *path)
 void exif_get_info(ExifData * ed, char *buffer, unsigned int maxsize)
 {
   ExifEntry *entry = NULL;
-  char buf[64];
+  char buf[128];
+  unsigned int exn_fcm = (EXN_FLASH_CONTROL_MODES_MAX-1); /* default to N/A */
+  unsigned int version = 0;
+  unsigned int length = 0;
 
   if ( (buffer == NULL) || (maxsize == 0) )
   {
@@ -151,7 +154,7 @@ void exif_get_info(ExifData * ed, char *buffer, unsigned int maxsize)
     snprintf(buffer, (size_t)maxsize, "%s\n", "No Exif data in file.");
     return;
   }
-  else if ( ed != NULL )
+  else
   {
     /* normal exif tags */
     exif_get_tag(ed, EXIF_IFD_0, EXIF_TAG_MAKE, buffer, maxsize);
@@ -185,10 +188,49 @@ void exif_get_info(ExifData * ed, char *buffer, unsigned int maxsize)
         /* Nikon */                                    
         if ( strcmp(buf, "Nikon") != 0 )
         {
-          /* Digital Vari-Program */
-          exif_get_mnote_tag(ed, 171, buffer + strlen(buffer), maxsize - strlen(buffer));
+          /* this is a nikon camera */
+          
+          buf[0] = '\0';
+          exif_get_tag(ed, EXIF_IFD_EXIF, EXIF_TAG_FLASH, buf, sizeof(buf));
+          exif_trim_spaces(buf);
+
+          if ( !(strcmp("Flash: Flash did not fire\n", buf) == 0) )
+          {
+            /* extended flash info if it was fired */
+  
+            /* Flash Setting */
+            exif_get_mnote_tag(ed, 8, buffer + strlen(buffer), maxsize - strlen(buffer));
+            /* Flash Mode */
+            exif_get_mnote_tag(ed, 9, buffer + strlen(buffer), maxsize - strlen(buffer));
+            /* flash exposure bracket value */
+            exif_get_mnote_tag(ed, 24, buffer + strlen(buffer), maxsize - strlen(buffer));
+            /* Flash used */
+            exif_get_mnote_tag(ed, 135, buffer + strlen(buffer), maxsize - strlen(buffer));
+
+            /* Flash info: control mode. */
+            /* libexif does not support flash info 168 yet. so we have to parse the debug data :-( */
+            buf[0] = '\0';
+            exif_get_mnote_tag(ed, 168, buf, sizeof(buf));
+            sscanf(buf, "(null): %u bytes unknown data: 303130%02X%*10s%02X", &length, &version, &exn_fcm);
+            exn_fcm = exn_fcm & EXN_FLASH_CONTROL_MODE_MASK;
+
+            if ( (exn_fcm < EXN_FLASH_CONTROL_MODES_MAX)
+                 && ( ((length == 22) && (version == '3'))      /* Nikon FlashInfo0103 */
+                      || ((length == 22) && (version == '4'))   /* Nikon FlashInfo0104 */
+                      || ((length == 21) && (version == '2'))   /* Nikon FlashInfo0102 */
+                      || ((length == 19) && (version == '0'))   /* Nikon FlashInfo0100 */
+                    )
+               )
+            {
+              snprintf(buffer + strlen(buffer), maxsize - strlen(buffer), "NikonFlashControlMode: %s\n", 
+                EXN_NikonFlashControlModeValues[exn_fcm]);
+            }
+          }
           /* Lens */
           exif_get_mnote_tag(ed, 132, buffer + strlen(buffer), maxsize - strlen(buffer));
+          /* Digital Vari-Program */
+          exif_get_mnote_tag(ed, 171, buffer + strlen(buffer), maxsize - strlen(buffer));
+          
         }
 
       }
diff --git a/src/exif_nikon.h b/src/exif_nikon.h
new file mode 100644
index 0000000..e2baf0d
--- /dev/null
+++ b/src/exif_nikon.h
@@ -0,0 +1,41 @@
+/* exif_nikon.h
+
+Copyright (C) 2012      Dennis Real.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to
+deal in the Software without restriction, including without limitation the
+rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+sell copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies of the Software and its documentation and acknowledgment shall be
+given in the documentation and software packages that this Software was
+used.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+*/
+
+#ifndef EXIF_NIKON_H
+#define EXIF_NIKON_H
+
+/* Flash control mode */
+/* http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/Nikon.html#FlashControlMode */
+#define EXN_FLASH_CONTROL_MODES_MAX 9
+char *EXN_NikonFlashControlModeValues[EXN_FLASH_CONTROL_MODES_MAX] = {"Off", 
+                                       "iTTL-BL", "iTTL", "Auto Aperture", 
+                                       "Automatic", "GN (distance priority)", 
+                                       "Manual", "Repeating Flash", 
+                                       "N/A" /* "N/A" is not a nikon setting */
+                                       };
+
+#define EXN_FLASH_CONTROL_MODE_MASK 0x7F
+
+#endif