From 5002fbeb9164c373f613042a87108297afb15ce9 Mon Sep 17 00:00:00 2001
From: Leander Hutton <leander@shoko.buttonhost.net>
Date: Fri, 14 Jun 2024 15:29:46 -0400
Subject: [PATCH] Initial commit

---
 README        |  5 +++++
 exif_viewer.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+)
 create mode 100644 README
 create mode 100644 exif_viewer.c

diff --git a/README b/README
new file mode 100644
index 0000000..2680451
--- /dev/null
+++ b/README
@@ -0,0 +1,5 @@
+Requires: libexif-dev on Debain or libexif-devel on Fedora/RHEL
+
+Compile:
+
+gcc -o exif_viewer exif_viewer.c $(pkg-config --cflags --libs libexif)
diff --git a/exif_viewer.c b/exif_viewer.c
new file mode 100644
index 0000000..7ea2979
--- /dev/null
+++ b/exif_viewer.c
@@ -0,0 +1,54 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <libexif/exif-data.h>
+
+// Prints EXIF entry
+// Requires: pointer to ExifEntry
+// pointer to user_data
+void printExifEntry(ExifEntry *entry, void *user_data) {
+    char value[1024];
+
+    // If entry does not exist just quit
+    if (!entry) return;
+
+    // Get the value as a string
+    exif_entry_get_value(entry, value, sizeof(value));
+    if (*value) {
+        printf("%s: %s\n", exif_tag_get_name(entry->tag), value);
+    }
+}
+
+// showExif
+// Gets passed content from exif_data_foreach_content
+// calls printExif 
+void showExif(ExifContent *content, void *user_data) {
+    if (!content) return;
+
+    // Iterate over all entries in the content and print them
+    exif_content_foreach_entry(content, printExifEntry, user_data);
+}
+
+int main(int argc, char *argv[]) {
+    ExifData *exifData;
+    const char *file;
+
+    if (argc != 2) {
+        fprintf(stderr, "Usage: %s <file-path>\n", argv[0]);
+        return 1;
+    }
+
+    file = argv[1];
+    exifData = exif_data_new_from_file(file);
+    if (!exifData) {
+        fprintf(stderr, "Error: Unable to open file %s\n", file);
+        return 1;
+    }
+
+    // Iterate over all EXIF contents and print entries
+    exif_data_foreach_content(exifData, showExif, NULL);
+
+    // Free the EXIF data
+    exif_data_unref(exifData);
+
+    return 0;
+}