[Files.app] Split the JavaScript files into subdirectories: common, background, and foreground

chrome/browser/resources/file_manager/js/metadata/image_parsers.js

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-'use strict';
-
-/* Base class for image metadata parsers that only need to look at a short
-  fragment at the start of the file */
-function SimpleImageParser(parent, type, urlFilter, headerSize) {
-  ImageParser.call(this, parent, type, urlFilter);
-  this.headerSize = headerSize;
-}
-
-SimpleImageParser.prototype = {__proto__: ImageParser.prototype};
-
-/**
- * @param {File} file  // TODO(JSDOC).
- * @param {Object} metadata  // TODO(JSDOC).
- * @param {function(Object)} callback  // TODO(JSDOC).
- * @param {function(string)} errorCallback  // TODO(JSDOC).
- */
-SimpleImageParser.prototype.parse = function(
-    file, metadata, callback, errorCallback) {
-  var self = this;
-  util.readFileBytes(file, 0, this.headerSize,
-    function(file, br) {
-      try {
-        self.parseHeader(metadata, br);
-        callback(metadata);
-      } catch (e) {
-        errorCallback(e.toString());
-      }
-    },
-    errorCallback);
-};
-
-
-function PngParser(parent) {
-  SimpleImageParser.call(this, parent, 'png', /\.png$/i, 24);
-}
-
-PngParser.prototype = {__proto__: SimpleImageParser.prototype};
-
-/**
- * @param {Object} metadata  // TODO(JSDOC).
- * @param {ByteReader} br  // TODO(JSDOC).
- */
-PngParser.prototype.parseHeader = function(metadata, br) {
-  br.setByteOrder(ByteReader.BIG_ENDIAN);
-
-  var signature = br.readString(8);
-  if (signature != '\x89PNG\x0D\x0A\x1A\x0A')
-    throw new Error('Invalid PNG signature: ' + signature);
-
-  br.seek(12);
-  var ihdr = br.readString(4);
-  if (ihdr != 'IHDR')
-    throw new Error('Missing IHDR chunk');
-
-  metadata.width = br.readScalar(4);
-  metadata.height = br.readScalar(4);
-};
-
-MetadataDispatcher.registerParserClass(PngParser);
-
-
-function BmpParser(parent) {
-  SimpleImageParser.call(this, parent, 'bmp', /\.bmp$/i, 28);
-}
-
-BmpParser.prototype = {__proto__: SimpleImageParser.prototype};
-
-/**
- * @param {Object} metadata  // TODO(JSDOC).
- * @param {ByteReader} br  // TODO(JSDOC).
- */
-BmpParser.prototype.parseHeader = function(metadata, br) {
-  br.setByteOrder(ByteReader.LITTLE_ENDIAN);
-
-  var signature = br.readString(2);
-  if (signature != 'BM')
-    throw new Error('Invalid BMP signature: ' + signature);
-
-  br.seek(18);
-  metadata.width = br.readScalar(4);
-  metadata.height = br.readScalar(4);
-};
-
-MetadataDispatcher.registerParserClass(BmpParser);
-
-
-function GifParser(parent) {
-  SimpleImageParser.call(this, parent, 'gif', /\.Gif$/i, 10);
-}
-
-GifParser.prototype = {__proto__: SimpleImageParser.prototype};
-
-/**
- * @param {Object} metadata  // TODO(JSDOC).
- * @param {ByteReader} br  // TODO(JSDOC).
- */
-GifParser.prototype.parseHeader = function(metadata, br) {
-  br.setByteOrder(ByteReader.LITTLE_ENDIAN);
-
-  var signature = br.readString(6);
-  if (!signature.match(/GIF8(7|9)a/))
-    throw new Error('Invalid GIF signature: ' + signature);
-
-  metadata.width = br.readScalar(2);
-  metadata.height = br.readScalar(2);
-};
-
-MetadataDispatcher.registerParserClass(GifParser);
-
-
-function WebpParser(parent) {
-  SimpleImageParser.call(this, parent, 'webp', /\.webp$/i, 30);
-}
-
-WebpParser.prototype = {__proto__: SimpleImageParser.prototype};
-
-/**
- * @param {Object} metadata  // TODO(JSDOC).
- * @param {ByteReader} br  // TODO(JSDOC).
- */
-WebpParser.prototype.parseHeader = function(metadata, br) {
-  br.setByteOrder(ByteReader.LITTLE_ENDIAN);
-
-  var riffSignature = br.readString(4);
-  if (riffSignature != 'RIFF')
-    throw new Error('Invalid RIFF signature: ' + riffSignature);
-
-  br.seek(8);
-  var webpSignature = br.readString(4);
-  if (webpSignature != 'WEBP')
-    throw new Error('Invalid WEBP signature: ' + webpSignature);
-
-  var chunkFormat = br.readString(4);
-  if (chunkFormat != 'VP8 ' && chunkFormat != 'VP8L')
-    throw new Error('Invalid chunk format: ' + chunkFormat);
-
-  if (chunkFormat == 'VP8 ') {
-    // VP8 lossy bitstream format.
-    br.seek(23);
-    var lossySignature = br.readScalar(2) | (br.readScalar(1) << 16);
-    if (lossySignature != 0x2a019d)
-      throw new Error('Invalid VP8 lossy bitstream signature: ' +
-        lossySignature);
-
-    var dimensionBits = br.readScalar(4);
-    metadata.width = dimensionBits & 0x3fff;
-    metadata.height = (dimensionBits >> 16) & 0x3fff;
-  } else {
-    // VP8 lossless bitstream format.
-    br.seek(20);
-    var losslessSignature = br.readScalar(1);
-    if (losslessSignature != 0x2f)
-      throw new Error('Invalid VP8 lossless bitstream signature: ' +
-        losslessSignature);
-
-    var dimensionBits = br.readScalar(4);
-    metadata.width = (dimensionBits & 0x3fff) + 1;
-    metadata.height = ((dimensionBits >> 14) & 0x3fff) + 1;
-  }
-};
-
-MetadataDispatcher.registerParserClass(WebpParser);