From 30fae5b7ee518758eb521e113c7b9ff41c1fd419 Mon Sep 17 00:00:00 2001
From: stephen mcquay <smcquay@apple.com>
Date: Sat, 10 Dec 2016 15:28:23 -0800
Subject: [PATCH] init

---
 license   | 27 +++++++++++++++++++++++++
 mov.go    | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 readme.md |  3 +++
 3 files changed, 90 insertions(+)
 create mode 100644 license
 create mode 100644 mov.go
 create mode 100644 readme.md

diff --git a/license b/license
new file mode 100644
index 0000000..8b4436a
--- /dev/null
+++ b/license
@@ -0,0 +1,27 @@
+Copyright (c) 2016, stephen mcquay
+
+All rights reserved.
+
+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.
+    * Neither the name of smcquay nor the names of its contributors
+      may be used to endorse or promote products derived from this software
+      without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"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 COPYRIGHT OWNER 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.
diff --git a/mov.go b/mov.go
new file mode 100644
index 0000000..88cfa5a
--- /dev/null
+++ b/mov.go
@@ -0,0 +1,60 @@
+package mov
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"os"
+	"time"
+)
+
+const epochAdjust = 2082844800
+
+// Created attempts to find a created time from the metadata in a .mov file.
+func Created(path string) (time.Time, error) {
+	var r time.Time
+	f, err := os.Open(path)
+	if err != nil {
+		return r, err
+	}
+	defer f.Close()
+
+	buf := [8]byte{}
+	for {
+		_, err := f.Read(buf[:])
+		if err != nil {
+			return r, err
+		}
+		if bytes.Equal(buf[4:8], []byte("moov")) {
+			break
+		} else {
+			atomSize := binary.BigEndian.Uint32(buf[:])
+			f.Seek(int64(atomSize)-8, 1)
+		}
+	}
+
+	_, err = f.Read(buf[:])
+	if err != nil {
+		return r, err
+	}
+
+	s := string(buf[4:8])
+	switch s {
+	case "mvhd":
+		if _, err := f.Seek(4, 1); err != nil {
+			return r, err
+		}
+		_, err = f.Read(buf[:4])
+		if err != nil {
+			return r, err
+		}
+		i := int64(binary.BigEndian.Uint32(buf[:4]))
+		c := i - epochAdjust
+		u := time.Unix(c, 0).Local()
+		return u, nil
+	case "cmov":
+		return r, errors.New("moov atom is compressed")
+	default:
+		return r, errors.New("expected to find 'mvhd' header, didn't")
+	}
+}
diff --git a/readme.md b/readme.md
new file mode 100644
index 0000000..b7e5bb8
--- /dev/null
+++ b/readme.md
@@ -0,0 +1,3 @@
+packge mov
+
+simple package to parse out creation time from a .mov file