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Diffstat (limited to 'tools/addon-sdk-1.7/packages/api-utils/lib/utils/data.js')
-rw-r--r-- | tools/addon-sdk-1.7/packages/api-utils/lib/utils/data.js | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/tools/addon-sdk-1.7/packages/api-utils/lib/utils/data.js b/tools/addon-sdk-1.7/packages/api-utils/lib/utils/data.js new file mode 100644 index 0000000..33356cd --- /dev/null +++ b/tools/addon-sdk-1.7/packages/api-utils/lib/utils/data.js @@ -0,0 +1,71 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +"use strict"; + +const { Cc, Ci, Cu } = require("chrome"); +const IOService = Cc["@mozilla.org/network/io-service;1"]. + getService(Ci.nsIIOService); +const AppShellService = Cc["@mozilla.org/appshell/appShellService;1"]. + getService(Ci.nsIAppShellService); + +const { NetUtil } = Cu.import("resource://gre/modules/NetUtil.jsm"); +const FaviconService = Cc["@mozilla.org/browser/favicon-service;1"]. + getService(Ci.nsIFaviconService); + +const PNG_B64 = "data:image/png;base64,"; +const DEF_FAVICON_URI = "chrome://mozapps/skin/places/defaultFavicon.png"; +let DEF_FAVICON = null; + +/** + * Takes URI of the page and returns associated favicon URI. + * If page under passed uri has no favicon then base64 encoded data URI of + * default faveicon is returned. + * @param {String} uri + * @returns {String} + */ +exports.getFaviconURIForLocation = function getFaviconURIForLocation(uri) { + let pageURI = NetUtil.newURI(uri); + try { + return FaviconService.getFaviconDataAsDataURL( + FaviconService.getFaviconForPage(pageURI)); + } + catch(e) { + if (!DEF_FAVICON) { + DEF_FAVICON = PNG_B64 + + base64Encode(getChromeURIContent(DEF_FAVICON_URI)); + } + return DEF_FAVICON; + } +} + +/** + * Takes chrome URI and returns content under that URI. + * @param {String} chromeURI + * @returns {String} + */ +function getChromeURIContent(chromeURI) { + let channel = IOService.newChannel(chromeURI, null, null); + let input = channel.open(); + let stream = Cc["@mozilla.org/binaryinputstream;1"]. + createInstance(Ci.nsIBinaryInputStream); + stream.setInputStream(input); + let content = stream.readBytes(input.available()); + stream.close(); + input.close(); + return content; +} +exports.getChromeURIContent = getChromeURIContent; + +/** + * Creates a base-64 encoded ASCII string from a string of binary data. + */ +function base64Encode(data) AppShellService.hiddenDOMWindow.btoa(String(data)); +exports.base64Encode = base64Encode; + +/** + * Decodes a string of data which has been encoded using base-64 encoding. + */ +function base64Decode(data) AppShellService.hiddenDOMWindow.atob(String(data)); +exports.base64Decode = base64Decode; |