From 4023ee86708f825b64e5f10bef31519ebfb0c5f8 Mon Sep 17 00:00:00 2001
From: Matthew Somerville <matthew-github@dracos.co.uk>
Date: Mon, 20 Jun 2016 11:45:35 +0100
Subject: Patch Dropzone to correctly orient preview images.

Include a patch file, applied to Dropzone as of version e524e03c, that
also includes our previous Opera patch from 445e9a3d. The new minified
file is our cut-down exif.js plus the patched dropzone.js.
---
 web/js/src/exif.js | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 web/js/src/exif.js

(limited to 'web/js/src')

diff --git a/web/js/src/exif.js b/web/js/src/exif.js
new file mode 100644
index 000000000..3a2c7e1c3
--- /dev/null
+++ b/web/js/src/exif.js
@@ -0,0 +1,94 @@
+/* Cut down version of https://github.com/exif-js/exif-js
+ * only looking for orientation EXIF data. MIT. */
+
+(function() {
+    var EXIF = {};
+    window.EXIF = EXIF;
+
+    function readEXIFData(file, start) {
+        var str = "";
+        for (var n = start; n < start+4; n++) {
+            str += String.fromCharCode(file.getUint8(n));
+        }
+        if (str != "Exif") {
+            return false;
+        }
+
+        var bigEnd,
+            tiffOffset = start + 6;
+
+        // test for TIFF validity and endianness
+        if (file.getUint16(tiffOffset) == 0x4949) {
+            bigEnd = false;
+        } else if (file.getUint16(tiffOffset) == 0x4D4D) {
+            bigEnd = true;
+        } else {
+            return false;
+        }
+
+        if (file.getUint16(tiffOffset+2, !bigEnd) != 0x002A) {
+            return false;
+        }
+
+        var firstIFDOffset = file.getUint32(tiffOffset+4, !bigEnd);
+        if (firstIFDOffset < 0x00000008) {
+            return false;
+        }
+
+        var dirStart = tiffOffset + firstIFDOffset,
+            entries = file.getUint16(dirStart, !bigEnd),
+            tags = {},
+            entryOffset,
+            i;
+
+        for (i=0;i<entries;i++) {
+            entryOffset = dirStart + i*12 + 2;
+            if (file.getUint16(entryOffset, !bigEnd) == 0x0112) {
+                return parseInt(file.getUint16(entryOffset + 8, !bigEnd), 10);
+            }
+        }
+        return false;
+    }
+
+    EXIF.getData = function(img) {
+        if ((img instanceof Image || img instanceof HTMLImageElement) && !img.complete) {
+            return false;
+        }
+
+        var base64 = img.src.replace(/^data\:([^\;]+)\;base64,/gmi, '');
+        var binary = atob(base64);
+        var len = binary.length;
+        var file = new ArrayBuffer(len);
+        var view = new Uint8Array(file);
+        for (var i = 0; i < len; i++) {
+            view[i] = binary.charCodeAt(i);
+        }
+
+        var dataView = new DataView(file);
+        if ((dataView.getUint8(0) != 0xFF) || (dataView.getUint8(1) != 0xD8)) {
+            return false; // not a valid jpeg
+        }
+
+        var offset = 2,
+            length = file.byteLength,
+            marker;
+
+        while (offset < length) {
+            if (dataView.getUint8(offset) != 0xFF) {
+                return false; // not a valid marker, something is wrong
+            }
+
+            marker = dataView.getUint8(offset + 1);
+
+            // we could implement handling for other markers here,
+            // but we're only looking for 0xFFE1 for EXIF data
+            if (marker == 225) {
+                return readEXIFData(dataView, offset + 4);
+                // offset += 2 + file.getShortAt(offset+2, true);
+            } else {
+                offset += 2 + dataView.getUint16(offset+2);
+            }
+        }
+    };
+
+})();
-- 
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