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const std = @import("std");
const exif = @cImport(@cInclude("libexif/exif-data.h"));
const cstd = @cImport(@cInclude("time.h"));
const tags = [_]c_uint {
exif.EXIF_TAG_DATE_TIME,
exif.EXIF_TAG_DATE_TIME_ORIGINAL,
exif.EXIF_TAG_DATE_TIME_DIGITIZED,
};
pub fn get_date_time(path: [*:0]const u8) ?i64 {
const exif_data = exif.exif_data_new_from_file(path);
defer exif.exif_data_unref(exif_data);
if (exif_data == 0) {
return null;
}
var entry: ?[*c]exif.struct__ExifEntry = null;
for (0..exif.EXIF_IFD_COUNT) |index| {
for (tags) |tag| {
entry = exif.exif_content_get_entry((exif_data.*).ifd[index], tag);
if (entry) |_| { break; }
}
if (entry) |_| { break; }
}
if (entry == 0) {
return null;
}
if (entry) |e| {
const c_data = (e.*).data;
return parse_date(c_data);
}
return null;
}
extern fn strptime(
s: [*c]const u8,
format: [*c]const u8,
tm: *cstd.tm,
) ?*const u8;
extern fn mktime(tm: *cstd.tm) i64;
fn parse_date(date: [*:0]const u8) ?i64 {
var tm: cstd.tm = std.mem.zeroes(cstd.tm);
if (strptime(date, "%Y:%m:%d %H:%M:%S", &tm)) |_| {
return mktime(&tm);
}
return null;
}
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