Merge pull request #11 from redmatrix/dev

Dev

1 files changed, 985 insertions, 0 deletions

diff --git a/library/cropperjs/src/js/utilities.js b/library/cropperjs/src/js/utilities.js
new file mode 100644
index 000000000..50b586a76
--- /dev/null
+++ b/library/cropperjs/src/js/utilities.js
@@ -0,0 +1,985 @@
+import {
+  WINDOW,
+} from './constants';
+
+/**
+ * Check if the given value is not a number.
+ */
+export const isNaN = Number.isNaN || WINDOW.isNaN;
+
+/**
+ * Check if the given value is a number.
+ * @param {*} value - The value to check.
+ * @returns {boolean} Returns `true` if the given value is a number, else `false`.
+ */
+export function isNumber(value) {
+  return typeof value === 'number' && !isNaN(value);
+}
+
+/**
+ * Check if the given value is undefined.
+ * @param {*} value - The value to check.
+ * @returns {boolean} Returns `true` if the given value is undefined, else `false`.
+ */
+export function isUndefined(value) {
+  return typeof value === 'undefined';
+}
+
+/**
+ * Check if the given value is an object.
+ * @param {*} value - The value to check.
+ * @returns {boolean} Returns `true` if the given value is an object, else `false`.
+ */
+export function isObject(value) {
+  return typeof value === 'object' && value !== null;
+}
+
+const { hasOwnProperty } = Object.prototype;
+
+/**
+ * Check if the given value is a plain object.
+ * @param {*} value - The value to check.
+ * @returns {boolean} Returns `true` if the given value is a plain object, else `false`.
+ */
+export function isPlainObject(value) {
+  if (!isObject(value)) {
+    return false;
+  }
+
+  try {
+    const { constructor } = value;
+    const { prototype } = constructor;
+
+    return constructor && prototype && hasOwnProperty.call(prototype, 'isPrototypeOf');
+  } catch (e) {
+    return false;
+  }
+}
+
+/**
+ * Check if the given value is a function.
+ * @param {*} value - The value to check.
+ * @returns {boolean} Returns `true` if the given value is a function, else `false`.
+ */
+export function isFunction(value) {
+  return typeof value === 'function';
+}
+
+/**
+ * Iterate the given data.
+ * @param {*} data - The data to iterate.
+ * @param {Function} callback - The process function for each element.
+ * @returns {*} The original data.
+ */
+export function each(data, callback) {
+  if (data && isFunction(callback)) {
+    if (Array.isArray(data) || isNumber(data.length)/* array-like */) {
+      const { length } = data;
+      let i;
+
+      for (i = 0; i < length; i += 1) {
+        if (callback.call(data, data[i], i, data) === false) {
+          break;
+        }
+      }
+    } else if (isObject(data)) {
+      Object.keys(data).forEach((key) => {
+        callback.call(data, data[key], key, data);
+      });
+    }
+  }
+
+  return data;
+}
+
+/**
+ * Extend the given object.
+ * @param {*} obj - The object to be extended.
+ * @param {*} args - The rest objects which will be merged to the first object.
+ * @returns {Object} The extended object.
+ */
+export function extend(obj, ...args) {
+  if (isObject(obj) && args.length > 0) {
+    if (Object.assign) {
+      return Object.assign(obj, ...args);
+    }
+
+    args.forEach((arg) => {
+      if (isObject(arg)) {
+        Object.keys(arg).forEach((key) => {
+          obj[key] = arg[key];
+        });
+      }
+    });
+  }
+
+  return obj;
+}
+
+/**
+ * Takes a function and returns a new one that will always have a particular context.
+ * @param {Function} fn - The target function.
+ * @param {Object} context - The new context for the function.
+ * @returns {boolean} The new function.
+ */
+export function proxy(fn, context, ...args) {
+  return (...args2) => fn.apply(context, args.concat(args2));
+}
+
+const REGEXP_DECIMALS = /\.\d*(?:0|9){12}\d*$/i;
+
+/**
+ * Normalize decimal number.
+ * Check out {@link http://0.30000000000000004.com/ }
+ * @param {number} value - The value to normalize.
+ * @param {number} [times=100000000000] - The times for normalizing.
+ * @returns {number} Returns the normalized number.
+ */
+export function normalizeDecimalNumber(value, times = 100000000000) {
+  return REGEXP_DECIMALS.test(value) ? (Math.round(value * times) / times) : value;
+}
+
+const REGEXP_SUFFIX = /^(?:width|height|left|top|marginLeft|marginTop)$/;
+
+/**
+ * Apply styles to the given element.
+ * @param {Element} element - The target element.
+ * @param {Object} styles - The styles for applying.
+ */
+export function setStyle(element, styles) {
+  const { style } = element;
+
+  each(styles, (value, property) => {
+    if (REGEXP_SUFFIX.test(property) && isNumber(value)) {
+      value += 'px';
+    }
+
+    style[property] = value;
+  });
+}
+
+/**
+ * Check if the given element has a special class.
+ * @param {Element} element - The element to check.
+ * @param {string} value - The class to search.
+ * @returns {boolean} Returns `true` if the special class was found.
+ */
+export function hasClass(element, value) {
+  return element.classList ?
+    element.classList.contains(value) :
+    element.className.indexOf(value) > -1;
+}
+
+/**
+ * Add classes to the given element.
+ * @param {Element} element - The target element.
+ * @param {string} value - The classes to be added.
+ */
+export function addClass(element, value) {
+  if (!value) {
+    return;
+  }
+
+  if (isNumber(element.length)) {
+    each(element, (elem) => {
+      addClass(elem, value);
+    });
+    return;
+  }
+
+  if (element.classList) {
+    element.classList.add(value);
+    return;
+  }
+
+  const className = element.className.trim();
+
+  if (!className) {
+    element.className = value;
+  } else if (className.indexOf(value) < 0) {
+    element.className = `${className} ${value}`;
+  }
+}
+
+/**
+ * Remove classes from the given element.
+ * @param {Element} element - The target element.
+ * @param {string} value - The classes to be removed.
+ */
+export function removeClass(element, value) {
+  if (!value) {
+    return;
+  }
+
+  if (isNumber(element.length)) {
+    each(element, (elem) => {
+      removeClass(elem, value);
+    });
+    return;
+  }
+
+  if (element.classList) {
+    element.classList.remove(value);
+    return;
+  }
+
+  if (element.className.indexOf(value) >= 0) {
+    element.className = element.className.replace(value, '');
+  }
+}
+
+/**
+ * Add or remove classes from the given element.
+ * @param {Element} element - The target element.
+ * @param {string} value - The classes to be toggled.
+ * @param {boolean} added - Add only.
+ */
+export function toggleClass(element, value, added) {
+  if (!value) {
+    return;
+  }
+
+  if (isNumber(element.length)) {
+    each(element, (elem) => {
+      toggleClass(elem, value, added);
+    });
+    return;
+  }
+
+  // IE10-11 doesn't support the second parameter of `classList.toggle`
+  if (added) {
+    addClass(element, value);
+  } else {
+    removeClass(element, value);
+  }
+}
+
+const REGEXP_HYPHENATE = /([a-z\d])([A-Z])/g;
+
+/**
+ * Hyphenate the given value.
+ * @param {string} value - The value to hyphenate.
+ * @returns {string} The hyphenated value.
+ */
+export function hyphenate(value) {
+  return value.replace(REGEXP_HYPHENATE, '$1-$2').toLowerCase();
+}
+
+/**
+ * Get data from the given element.
+ * @param {Element} element - The target element.
+ * @param {string} name - The data key to get.
+ * @returns {string} The data value.
+ */
+export function getData(element, name) {
+  if (isObject(element[name])) {
+    return element[name];
+  } else if (element.dataset) {
+    return element.dataset[name];
+  }
+
+  return element.getAttribute(`data-${hyphenate(name)}`);
+}
+
+/**
+ * Set data to the given element.
+ * @param {Element} element - The target element.
+ * @param {string} name - The data key to set.
+ * @param {string} data - The data value.
+ */
+export function setData(element, name, data) {
+  if (isObject(data)) {
+    element[name] = data;
+  } else if (element.dataset) {
+    element.dataset[name] = data;
+  } else {
+    element.setAttribute(`data-${hyphenate(name)}`, data);
+  }
+}
+
+/**
+ * Remove data from the given element.
+ * @param {Element} element - The target element.
+ * @param {string} name - The data key to remove.
+ */
+export function removeData(element, name) {
+  if (isObject(element[name])) {
+    try {
+      delete element[name];
+    } catch (e) {
+      element[name] = null;
+    }
+  } else if (element.dataset) {
+    // #128 Safari not allows to delete dataset property
+    try {
+      delete element.dataset[name];
+    } catch (e) {
+      element.dataset[name] = null;
+    }
+  } else {
+    element.removeAttribute(`data-${hyphenate(name)}`);
+  }
+}
+
+const REGEXP_SPACES = /\s\s*/;
+
+/**
+ * Remove event listener from the target element.
+ * @param {Element} element - The event target.
+ * @param {string} type - The event type(s).
+ * @param {Function} listener - The event listener.
+ * @param {Object} options - The event options.
+ */
+export function removeListener(element, type, listener, options = {}) {
+  if (!isFunction(listener)) {
+    return;
+  }
+
+  const types = type.trim().split(REGEXP_SPACES);
+
+  if (types.length > 1) {
+    each(types, (t) => {
+      removeListener(element, t, listener, options);
+    });
+    return;
+  }
+
+  if (element.removeEventListener) {
+    element.removeEventListener(type, listener, options);
+  } else if (element.detachEvent) {
+    element.detachEvent(`on${type}`, listener);
+  }
+}
+
+/**
+ * Add event listener to the target element.
+ * @param {Element} element - The event target.
+ * @param {string} type - The event type(s).
+ * @param {Function} listener - The event listener.
+ * @param {Object} options - The event options.
+ */
+export function addListener(element, type, listener, options = {}) {
+  if (!isFunction(listener)) {
+    return;
+  }
+
+  const types = type.trim().split(REGEXP_SPACES);
+
+  if (types.length > 1) {
+    each(types, (t) => {
+      addListener(element, t, listener, options);
+    });
+    return;
+  }
+
+  if (options.once) {
+    const originalListener = listener;
+
+    listener = (...args) => {
+      removeListener(element, type, listener, options);
+      return originalListener.apply(element, args);
+    };
+  }
+
+  if (element.addEventListener) {
+    element.addEventListener(type, listener, options);
+  } else if (element.attachEvent) {
+    element.attachEvent(`on${type}`, listener);
+  }
+}
+
+/**
+ * Dispatch event on the target element.
+ * @param {Element} element - The event target.
+ * @param {string} type - The event type(s).
+ * @param {Object} data - The additional event data.
+ * @returns {boolean} Indicate if the event is default prevented or not.
+ */
+export function dispatchEvent(element, type, data) {
+  if (element.dispatchEvent) {
+    let event;
+
+    // Event and CustomEvent on IE9-11 are global objects, not constructors
+    if (isFunction(Event) && isFunction(CustomEvent)) {
+      if (isUndefined(data)) {
+        event = new Event(type, {
+          bubbles: true,
+          cancelable: true,
+        });
+      } else {
+        event = new CustomEvent(type, {
+          detail: data,
+          bubbles: true,
+          cancelable: true,
+        });
+      }
+    } else if (isUndefined(data)) {
+      event = document.createEvent('Event');
+      event.initEvent(type, true, true);
+    } else {
+      event = document.createEvent('CustomEvent');
+      event.initCustomEvent(type, true, true, data);
+    }
+
+    // IE9+
+    return element.dispatchEvent(event);
+  } else if (element.fireEvent) {
+    // IE6-10 (native events only)
+    return element.fireEvent(`on${type}`);
+  }
+
+  return true;
+}
+
+/**
+ * Get the offset base on the document.
+ * @param {Element} element - The target element.
+ * @returns {Object} The offset data.
+ */
+export function getOffset(element) {
+  const doc = document.documentElement;
+  const box = element.getBoundingClientRect();
+
+  return {
+    left: box.left + (
+      (window.scrollX || (doc && doc.scrollLeft) || 0) - ((doc && doc.clientLeft) || 0)
+    ),
+    top: box.top + (
+      (window.scrollY || (doc && doc.scrollTop) || 0) - ((doc && doc.clientTop) || 0)
+    ),
+  };
+}
+
+/**
+ * Empty an element.
+ * @param {Element} element - The element to empty.
+ */
+export function empty(element) {
+  while (element.firstChild) {
+    element.removeChild(element.firstChild);
+  }
+}
+
+const { location } = WINDOW;
+const REGEXP_ORIGINS = /^(https?:)\/\/([^:/?#]+):?(\d*)/i;
+
+/**
+ * Check if the given URL is a cross origin URL.
+ * @param {string} url - The target URL.
+ * @returns {boolean} Returns `true` if the given URL is a cross origin URL, else `false`.
+ */
+export function isCrossOriginURL(url) {
+  const parts = url.match(REGEXP_ORIGINS);
+
+  return parts && (
+    parts[1] !== location.protocol ||
+    parts[2] !== location.hostname ||
+    parts[3] !== location.port
+  );
+}
+
+/**
+ * Add timestamp to the given URL.
+ * @param {string} url - The target URL.
+ * @returns {string} The result URL.
+ */
+export function addTimestamp(url) {
+  const timestamp = `timestamp=${(new Date()).getTime()}`;
+
+  return (url + (url.indexOf('?') === -1 ? '?' : '&') + timestamp);
+}
+
+/**
+ * Get transforms base on the given object.
+ * @param {Object} obj - The target object.
+ * @returns {string} A string contains transform values.
+ */
+export function getTransforms({
+  rotate,
+  scaleX,
+  scaleY,
+  translateX,
+  translateY,
+}) {
+  const values = [];
+
+  if (isNumber(translateX) && translateX !== 0) {
+    values.push(`translateX(${translateX}px)`);
+  }
+
+  if (isNumber(translateY) && translateY !== 0) {
+    values.push(`translateY(${translateY}px)`);
+  }
+
+  // Rotate should come first before scale to match orientation transform
+  if (isNumber(rotate) && rotate !== 0) {
+    values.push(`rotate(${rotate}deg)`);
+  }
+
+  if (isNumber(scaleX) && scaleX !== 1) {
+    values.push(`scaleX(${scaleX})`);
+  }
+
+  if (isNumber(scaleY) && scaleY !== 1) {
+    values.push(`scaleY(${scaleY})`);
+  }
+
+  const transform = values.length ? values.join(' ') : 'none';
+
+  return {
+    WebkitTransform: transform,
+    msTransform: transform,
+    transform,
+  };
+}
+
+const { navigator } = WINDOW;
+const IS_SAFARI_OR_UIWEBVIEW = navigator && /(Macintosh|iPhone|iPod|iPad).*AppleWebKit/i.test(navigator.userAgent);
+
+/**
+ * Get an image's natural sizes.
+ * @param {string} image - The target image.
+ * @param {Function} callback - The callback function.
+ */
+export function getImageNaturalSizes(image, callback) {
+  // Modern browsers (except Safari)
+  if (image.naturalWidth && !IS_SAFARI_OR_UIWEBVIEW) {
+    callback(image.naturalWidth, image.naturalHeight);
+    return;
+  }
+
+  const newImage = document.createElement('img');
+  const body = document.body || document.documentElement;
+
+  newImage.onload = () => {
+    callback(newImage.width, newImage.height);
+
+    if (!IS_SAFARI_OR_UIWEBVIEW) {
+      body.removeChild(newImage);
+    }
+  };
+
+  newImage.src = image.src;
+
+  // iOS Safari will convert the image automatically
+  // with its orientation once append it into DOM (#279)
+  if (!IS_SAFARI_OR_UIWEBVIEW) {
+    newImage.style.cssText = (
+      'left:0;' +
+      'max-height:none!important;' +
+      'max-width:none!important;' +
+      'min-height:0!important;' +
+      'min-width:0!important;' +
+      'opacity:0;' +
+      'position:absolute;' +
+      'top:0;' +
+      'z-index:-1;'
+    );
+    body.appendChild(newImage);
+  }
+}
+
+/**
+ * Get the max ratio of a group of pointers.
+ * @param {string} pointers - The target pointers.
+ * @returns {number} The result ratio.
+ */
+export function getMaxZoomRatio(pointers) {
+  const pointers2 = extend({}, pointers);
+  const ratios = [];
+
+  each(pointers, (pointer, pointerId) => {
+    delete pointers2[pointerId];
+
+    each(pointers2, (pointer2) => {
+      const x1 = Math.abs(pointer.startX - pointer2.startX);
+      const y1 = Math.abs(pointer.startY - pointer2.startY);
+      const x2 = Math.abs(pointer.endX - pointer2.endX);
+      const y2 = Math.abs(pointer.endY - pointer2.endY);
+      const z1 = Math.sqrt((x1 * x1) + (y1 * y1));
+      const z2 = Math.sqrt((x2 * x2) + (y2 * y2));
+      const ratio = (z2 - z1) / z1;
+
+      ratios.push(ratio);
+    });
+  });
+
+  ratios.sort((a, b) => Math.abs(a) < Math.abs(b));
+
+  return ratios[0];
+}
+
+/**
+ * Get a pointer from an event object.
+ * @param {Object} event - The target event object.
+ * @param {boolean} endOnly - Indicates if only returns the end point coordinate or not.
+ * @returns {Object} The result pointer contains start and/or end point coordinates.
+ */
+export function getPointer({ pageX, pageY }, endOnly) {
+  const end = {
+    endX: pageX,
+    endY: pageY,
+  };
+
+  if (endOnly) {
+    return end;
+  }
+
+  return extend({
+    startX: pageX,
+    startY: pageY,
+  }, end);
+}
+
+/**
+ * Get the center point coordinate of a group of pointers.
+ * @param {Object} pointers - The target pointers.
+ * @returns {Object} The center point coordinate.
+ */
+export function getPointersCenter(pointers) {
+  let pageX = 0;
+  let pageY = 0;
+  let count = 0;
+
+  each(pointers, ({ startX, startY }) => {
+    pageX += startX;
+    pageY += startY;
+    count += 1;
+  });
+
+  pageX /= count;
+  pageY /= count;
+
+  return {
+    pageX,
+    pageY,
+  };
+}
+
+/**
+ * Check if the given value is a finite number.
+ */
+export const isFinite = Number.isFinite || WINDOW.isFinite;
+
+/**
+ * Get the max sizes in a rectangle under the given aspect ratio.
+ * @param {Object} data - The original sizes.
+ * @param {string} [type='contain'] - The adjust type.
+ * @returns {Object} The result sizes.
+ */
+export function getAdjustedSizes(
+  {
+    aspectRatio,
+    height,
+    width,
+  },
+  type = 'contain', // or 'cover'
+) {
+  const isValidNumber = value => isFinite(value) && value > 0;
+
+  if (isValidNumber(width) && isValidNumber(height)) {
+    const adjustedWidth = height * aspectRatio;
+
+    if ((type === 'contain' && adjustedWidth > width) || (type === 'cover' && adjustedWidth < width)) {
+      height = width / aspectRatio;
+    } else {
+      width = height * aspectRatio;
+    }
+  } else if (isValidNumber(width)) {
+    height = width / aspectRatio;
+  } else if (isValidNumber(height)) {
+    width = height * aspectRatio;
+  }
+
+  return {
+    width,
+    height,
+  };
+}
+
+/**
+ * Get the new sizes of a rectangle after rotated.
+ * @param {Object} data - The original sizes.
+ * @returns {Object} The result sizes.
+ */
+export function getRotatedSizes({ width, height, degree }) {
+  degree = Math.abs(degree) % 180;
+
+  if (degree === 90) {
+    return {
+      width: height,
+      height: width,
+    };
+  }
+
+  const arc = ((degree % 90) * Math.PI) / 180;
+  const sinArc = Math.sin(arc);
+  const cosArc = Math.cos(arc);
+  const newWidth = (width * cosArc) + (height * sinArc);
+  const newHeight = (width * sinArc) + (height * cosArc);
+
+  return degree > 90 ? {
+    width: newHeight,
+    height: newWidth,
+  } : {
+    width: newWidth,
+    height: newHeight,
+  };
+}
+
+/**
+ * Get a canvas which drew the given image.
+ * @param {HTMLImageElement} image - The image for drawing.
+ * @param {Object} imageData - The image data.
+ * @param {Object} canvasData - The canvas data.
+ * @param {Object} options - The options.
+ * @returns {HTMLCanvasElement} The result canvas.
+ */
+export function getSourceCanvas(
+  image,
+  {
+    rotate = 0,
+    scaleX = 1,
+    scaleY = 1,
+  },
+  {
+    aspectRatio,
+    naturalWidth,
+    naturalHeight,
+  },
+  {
+    fillColor = 'transparent',
+    imageSmoothingEnabled = true,
+    imageSmoothingQuality = 'low',
+    maxWidth = Infinity,
+    maxHeight = Infinity,
+    minWidth = 0,
+    minHeight = 0,
+  },
+) {
+  const canvas = document.createElement('canvas');
+  const context = canvas.getContext('2d');
+  const maxSizes = getAdjustedSizes({
+    aspectRatio,
+    width: maxWidth,
+    height: maxHeight,
+  });
+  const minSizes = getAdjustedSizes({
+    aspectRatio,
+    width: minWidth,
+    height: minHeight,
+  }, 'cover');
+  const width = Math.min(maxSizes.width, Math.max(minSizes.width, naturalWidth));
+  const height = Math.min(maxSizes.height, Math.max(minSizes.height, naturalHeight));
+  const params = [
+    -width / 2,
+    -height / 2,
+    width,
+    height,
+  ];
+
+  canvas.width = normalizeDecimalNumber(width);
+  canvas.height = normalizeDecimalNumber(height);
+  context.fillStyle = fillColor;
+  context.fillRect(0, 0, width, height);
+  context.save();
+  context.translate(width / 2, height / 2);
+  context.rotate((rotate * Math.PI) / 180);
+  context.scale(scaleX, scaleY);
+  context.imageSmoothingEnabled = imageSmoothingEnabled;
+  context.imageSmoothingQuality = imageSmoothingQuality;
+  context.drawImage(image, ...params.map(param => Math.floor(normalizeDecimalNumber(param))));
+  context.restore();
+  return canvas;
+}
+
+const { fromCharCode } = String;
+
+/**
+ * Get string from char code in data view.
+ * @param {DataView} dataView - The data view for read.
+ * @param {number} start - The start index.
+ * @param {number} length - The read length.
+ * @returns {string} The read result.
+ */
+export function getStringFromCharCode(dataView, start, length) {
+  let str = '';
+  let i;
+
+  length += start;
+
+  for (i = start; i < length; i += 1) {
+    str += fromCharCode(dataView.getUint8(i));
+  }
+
+  return str;
+}
+
+const REGEXP_DATA_URL_HEAD = /^data:.*,/;
+
+/**
+ * Transform Data URL to array buffer.
+ * @param {string} dataURL - The Data URL to transform.
+ * @returns {ArrayBuffer} The result array buffer.
+ */
+export function dataURLToArrayBuffer(dataURL) {
+  const base64 = dataURL.replace(REGEXP_DATA_URL_HEAD, '');
+  const binary = atob(base64);
+  const arrayBuffer = new ArrayBuffer(binary.length);
+  const uint8 = new Uint8Array(arrayBuffer);
+
+  each(uint8, (value, i) => {
+    uint8[i] = binary.charCodeAt(i);
+  });
+
+  return arrayBuffer;
+}
+
+/**
+ * Transform array buffer to Data URL.
+ * @param {ArrayBuffer} arrayBuffer - The array buffer to transform.
+ * @param {string} mimeType - The mime type of the Data URL.
+ * @returns {string} The result Data URL.
+ */
+export function arrayBufferToDataURL(arrayBuffer, mimeType) {
+  const uint8 = new Uint8Array(arrayBuffer);
+  let data = '';
+
+  // TypedArray.prototype.forEach is not supported in some browsers.
+  each(uint8, (value) => {
+    data += fromCharCode(value);
+  });
+
+  return `data:${mimeType};base64,${btoa(data)}`;
+}
+
+/**
+ * Get orientation value from given array buffer.
+ * @param {ArrayBuffer} arrayBuffer - The array buffer to read.
+ * @returns {number} The read orientation value.
+ */
+export function getOrientation(arrayBuffer) {
+  const dataView = new DataView(arrayBuffer);
+  let orientation;
+  let littleEndian;
+  let app1Start;
+  let ifdStart;
+
+  // Only handle JPEG image (start by 0xFFD8)
+  if (dataView.getUint8(0) === 0xFF && dataView.getUint8(1) === 0xD8) {
+    const length = dataView.byteLength;
+    let offset = 2;
+
+    while (offset < length) {
+      if (dataView.getUint8(offset) === 0xFF && dataView.getUint8(offset + 1) === 0xE1) {
+        app1Start = offset;
+        break;
+      }
+
+      offset += 1;
+    }
+  }
+
+  if (app1Start) {
+    const exifIDCode = app1Start + 4;
+    const tiffOffset = app1Start + 10;
+
+    if (getStringFromCharCode(dataView, exifIDCode, 4) === 'Exif') {
+      const endianness = dataView.getUint16(tiffOffset);
+
+      littleEndian = endianness === 0x4949;
+
+      if (littleEndian || endianness === 0x4D4D /* bigEndian */) {
+        if (dataView.getUint16(tiffOffset + 2, littleEndian) === 0x002A) {
+          const firstIFDOffset = dataView.getUint32(tiffOffset + 4, littleEndian);
+
+          if (firstIFDOffset >= 0x00000008) {
+            ifdStart = tiffOffset + firstIFDOffset;
+          }
+        }
+      }
+    }
+  }
+
+  if (ifdStart) {
+    const length = dataView.getUint16(ifdStart, littleEndian);
+    let offset;
+    let i;
+
+    for (i = 0; i < length; i += 1) {
+      offset = ifdStart + (i * 12) + 2;
+
+      if (dataView.getUint16(offset, littleEndian) === 0x0112 /* Orientation */) {
+        // 8 is the offset of the current tag's value
+        offset += 8;
+
+        // Get the original orientation value
+        orientation = dataView.getUint16(offset, littleEndian);
+
+        // Override the orientation with its default value
+        dataView.setUint16(offset, 1, littleEndian);
+        break;
+      }
+    }
+  }
+
+  return orientation;
+}
+
+/**
+ * Parse Exif Orientation value.
+ * @param {number} orientation - The orientation to parse.
+ * @returns {Object} The parsed result.
+ */
+export function parseOrientation(orientation) {
+  let rotate = 0;
+  let scaleX = 1;
+  let scaleY = 1;
+
+  switch (orientation) {
+    // Flip horizontal
+    case 2:
+      scaleX = -1;
+      break;
+
+    // Rotate left 180°
+    case 3:
+      rotate = -180;
+      break;
+
+    // Flip vertical
+    case 4:
+      scaleY = -1;
+      break;
+
+    // Flip vertical and rotate right 90°
+    case 5:
+      rotate = 90;
+      scaleY = -1;
+      break;
+
+    // Rotate right 90°
+    case 6:
+      rotate = 90;
+      break;
+
+    // Flip horizontal and rotate right 90°
+    case 7:
+      rotate = 90;
+      scaleX = -1;
+      break;
+
+    // Rotate left 90°
+    case 8:
+      rotate = -90;
+      break;
+
+    default:
+  }
+
+  return {
+    rotate,
+    scaleX,
+    scaleY,
+  };
+}