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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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tree10027f336435511475e392454359edea8e25895d /toolkit/modules/PropertyListUtils.jsm
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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+/* 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/. */
+
+/**
+ * Module for reading Property Lists (.plist) files
+ * ------------------------------------------------
+ * This module functions as a reader for Apple Property Lists (.plist files).
+ * It supports both binary and xml formatted property lists. It does not
+ * support the legacy ASCII format. Reading of Cocoa's Keyed Archives serialized
+ * to binary property lists isn't supported either.
+ *
+ * Property Lists objects are represented by standard JS and Mozilla types,
+ * namely:
+ *
+ * XML type Cocoa Class Returned type(s)
+ * --------------------------------------------------------------------------
+ * <true/> / <false/> NSNumber TYPE_PRIMITIVE boolean
+ * <integer> / <real> NSNumber TYPE_PRIMITIVE number
+ * TYPE_INT64 String [1]
+ * Not Available NSNull TYPE_PRIMITIVE null [2]
+ * TYPE_PRIMITIVE undefined [3]
+ * <date/> NSDate TYPE_DATE Date
+ * <data/> NSData TYPE_UINT8_ARRAY Uint8Array
+ * <array/> NSArray TYPE_ARRAY Array
+ * Not Available NSSet TYPE_ARRAY Array [2][4]
+ * <dict/> NSDictionary TYPE_DICTIONARY Map
+ *
+ * Use PropertyListUtils.getObjectType to detect the type of a Property list
+ * object.
+ *
+ * -------------
+ * 1) Property lists supports storing U/Int64 numbers, while JS can only handle
+ * numbers that are in this limits of float-64 (±2^53). For numbers that
+ * do not outbound this limits, simple primitive number are always used.
+ * Otherwise, a String object.
+ * 2) About NSNull and NSSet values: While the xml format has no support for
+ * representing null and set values, the documentation for the binary format
+ * states that it supports storing both types. However, the Cocoa APIs for
+ * serializing property lists do not seem to support either types (test with
+ * NSPropertyListSerialization::propertyList:isValidForFormat). Furthermore,
+ * if an array or a dictionary (Map) contains a NSNull or a NSSet value, they cannot
+ * be serialized to a property list.
+ * As for usage within OS X, not surprisingly there's no known usage of
+ * storing either of these types in a property list. It seems that, for now,
+ * Apple is keeping the features of binary and xml formats in sync, probably as
+ * long as the XML format is not officially deprecated.
+ * 3) Not used anywhere.
+ * 4) About NSSet representation: For the time being, we represent those
+ * theoretical NSSet objects the same way NSArray is represented.
+ * While this would most certainly work, it is not the right way to handle
+ * it. A more correct representation for a set is a js generator, which would
+ * read the set lazily and has no indices semantics.
+ */
+
+"use strict";
+
+this.EXPORTED_SYMBOLS = ["PropertyListUtils"];
+
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+const Cu = Components.utils;
+
+Cu.importGlobalProperties(['File', 'FileReader']);
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "ctypes",
+ "resource://gre/modules/ctypes.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "Services",
+ "resource://gre/modules/Services.jsm");
+
+this.PropertyListUtils = Object.freeze({
+ /**
+ * Asynchronously reads a file as a property list.
+ *
+ * @param aFile (nsIDOMBlob/nsILocalFile)
+ * the file to be read as a property list.
+ * @param aCallback
+ * If the property list is read successfully, aPropertyListRoot is set
+ * to the root object of the property list.
+ * Use getPropertyListObjectType to detect its type.
+ * If it's not read successfully, aPropertyListRoot is set to null.
+ * The reaon for failure is reported to the Error Console.
+ */
+ read: function PLU_read(aFile, aCallback) {
+ if (!(aFile instanceof Ci.nsILocalFile || aFile instanceof File))
+ throw new Error("aFile is not a file object");
+ if (typeof(aCallback) != "function")
+ throw new Error("Invalid value for aCallback");
+
+ // We guarantee not to throw directly for any other exceptions, and always
+ // call aCallback.
+ Services.tm.mainThread.dispatch(function() {
+ let file = aFile;
+ try {
+ if (file instanceof Ci.nsILocalFile) {
+ if (!file.exists())
+ throw new Error("The file pointed by aFile does not exist");
+
+ file = File.createFromNsIFile(file);
+ }
+
+ let fileReader = new FileReader();
+ let onLoadEnd = function() {
+ let root = null;
+ try {
+ fileReader.removeEventListener("loadend", onLoadEnd, false);
+ if (fileReader.readyState != fileReader.DONE)
+ throw new Error("Could not read file contents: " + fileReader.error);
+
+ root = this._readFromArrayBufferSync(fileReader.result);
+ }
+ finally {
+ aCallback(root);
+ }
+ }.bind(this);
+ fileReader.addEventListener("loadend", onLoadEnd, false);
+ fileReader.readAsArrayBuffer(file);
+ }
+ catch (ex) {
+ aCallback(null);
+ throw ex;
+ }
+ }.bind(this), Ci.nsIThread.DISPATCH_NORMAL);
+ },
+
+ /**
+ * DO NOT USE ME. Once Bug 718189 is fixed, this method won't be public.
+ *
+ * Synchronously read an ArrayBuffer contents as a property list.
+ */
+ _readFromArrayBufferSync: function PLU__readFromArrayBufferSync(aBuffer) {
+ if (BinaryPropertyListReader.prototype.canProcess(aBuffer))
+ return new BinaryPropertyListReader(aBuffer).root;
+
+ // Convert the buffer into an XML tree.
+ let domParser = Cc["@mozilla.org/xmlextras/domparser;1"].
+ createInstance(Ci.nsIDOMParser);
+ let bytesView = new Uint8Array(aBuffer);
+ try {
+ let doc = domParser.parseFromBuffer(bytesView, bytesView.length,
+ "application/xml");
+ return new XMLPropertyListReader(doc).root;
+ }
+ catch (ex) {
+ throw new Error("aBuffer cannot be parsed as a DOM document: " + ex);
+ }
+ },
+
+ TYPE_PRIMITIVE: 0,
+ TYPE_DATE: 1,
+ TYPE_UINT8_ARRAY: 2,
+ TYPE_ARRAY: 3,
+ TYPE_DICTIONARY: 4,
+ TYPE_INT64: 5,
+
+ /**
+ * Get the type in which the given property list object is represented.
+ * Check the header for the mapping between the TYPE* constants to js types
+ * and objects.
+ *
+ * @return one of the TYPE_* constants listed above.
+ * @note this method is merely for convenience. It has no magic to detect
+ * that aObject is indeed a property list object created by this module.
+ */
+ getObjectType: function PLU_getObjectType(aObject) {
+ if (aObject === null || typeof(aObject) != "object")
+ return this.TYPE_PRIMITIVE;
+
+ // Given current usage, we could assume that aObject was created in the
+ // scope of this module, but in future, this util may be used as part of
+ // serializing js objects to a property list - in which case the object
+ // would most likely be created in the caller's scope.
+ let global = Cu.getGlobalForObject(aObject);
+
+ if (aObject instanceof global.Map)
+ return this.TYPE_DICTIONARY;
+ if (Array.isArray(aObject))
+ return this.TYPE_ARRAY;
+ if (aObject instanceof global.Date)
+ return this.TYPE_DATE;
+ if (aObject instanceof global.Uint8Array)
+ return this.TYPE_UINT8_ARRAY;
+ if (aObject instanceof global.String && "__INT_64_WRAPPER__" in aObject)
+ return this.TYPE_INT64;
+
+ throw new Error("aObject is not as a property list object.");
+ },
+
+ /**
+ * Wraps a 64-bit stored in the form of a string primitive as a String object,
+ * which we can later distiguish from regular string values.
+ * @param aPrimitive
+ * a number in the form of either a primitive string or a primitive number.
+ * @return a String wrapper around aNumberStr that can later be identified
+ * as holding 64-bit number using getObjectType.
+ */
+ wrapInt64: function PLU_wrapInt64(aPrimitive) {
+ if (typeof(aPrimitive) != "string" && typeof(aPrimitive) != "number")
+ throw new Error("aPrimitive should be a string primitive");
+
+ let wrapped = new String(aPrimitive);
+ Object.defineProperty(wrapped, "__INT_64_WRAPPER__", { value: true });
+ return wrapped;
+ }
+});
+
+/**
+ * Here's the base structure of binary-format property lists.
+ * 1) Header - magic number
+ * - 6 bytes - "bplist"
+ * - 2 bytes - version number. This implementation only supports version 00.
+ * 2) Objects Table
+ * Variable-sized objects, see _readObject for how various types of objects
+ * are constructed.
+ * 3) Offsets Table
+ * The offset of each object in the objects table. The integer size is
+ * specified in the trailer.
+ * 4) Trailer
+ * - 6 unused bytes
+ * - 1 byte: the size of integers in the offsets table
+ * - 1 byte: the size of object references for arrays, sets and
+ * dictionaries.
+ * - 8 bytes: the number of objects in the objects table
+ * - 8 bytes: the index of the root object's offset in the offsets table.
+ * - 8 bytes: the offset of the offsets table.
+ *
+ * Note: all integers are stored in big-endian form.
+ */
+
+/**
+ * Reader for binary-format property lists.
+ *
+ * @param aBuffer
+ * ArrayBuffer object from which the binary plist should be read.
+ */
+function BinaryPropertyListReader(aBuffer) {
+ this._dataView = new DataView(aBuffer);
+
+ const JS_MAX_INT = Math.pow(2, 53);
+ this._JS_MAX_INT_SIGNED = ctypes.Int64(JS_MAX_INT);
+ this._JS_MAX_INT_UNSIGNED = ctypes.UInt64(JS_MAX_INT);
+ this._JS_MIN_INT = ctypes.Int64(-JS_MAX_INT);
+
+ try {
+ this._readTrailerInfo();
+ this._readObjectsOffsets();
+ }
+ catch (ex) {
+ throw new Error("Could not read aBuffer as a binary property list");
+ }
+ this._objects = [];
+}
+
+BinaryPropertyListReader.prototype = {
+ /**
+ * Checks if the given ArrayBuffer can be read as a binary property list.
+ * It can be called on the prototype.
+ */
+ canProcess: function BPLR_canProcess(aBuffer) {
+ return Array.from(new Uint8Array(aBuffer, 0, 8)).map(c => String.fromCharCode(c)).
+ join("") == "bplist00";
+ },
+
+ get root() {
+ return this._readObject(this._rootObjectIndex);
+ },
+
+ _readTrailerInfo: function BPLR__readTrailer() {
+ // The first 6 bytes of the 32-bytes trailer are unused
+ let trailerOffset = this._dataView.byteLength - 26;
+ [this._offsetTableIntegerSize, this._objectRefSize] =
+ this._readUnsignedInts(trailerOffset, 1, 2);
+
+ [this._numberOfObjects, this._rootObjectIndex, this._offsetTableOffset] =
+ this._readUnsignedInts(trailerOffset + 2, 8, 3);
+ },
+
+ _readObjectsOffsets: function BPLR__readObjectsOffsets() {
+ this._offsetTable = this._readUnsignedInts(this._offsetTableOffset,
+ this._offsetTableIntegerSize,
+ this._numberOfObjects);
+ },
+
+ _readSignedInt64: function BPLR__readSignedInt64(aByteOffset) {
+ let lo = this._dataView.getUint32(aByteOffset + 4);
+ let hi = this._dataView.getInt32(aByteOffset);
+ let int64 = ctypes.Int64.join(hi, lo);
+ if (ctypes.Int64.compare(int64, this._JS_MAX_INT_SIGNED) == 1 ||
+ ctypes.Int64.compare(int64, this._JS_MIN_INT) == -1)
+ return PropertyListUtils.wrapInt64(int64.toString());
+
+ return parseInt(int64.toString(), 10);
+ },
+
+ _readReal: function BPLR__readReal(aByteOffset, aRealSize) {
+ if (aRealSize == 4)
+ return this._dataView.getFloat32(aByteOffset);
+ if (aRealSize == 8)
+ return this._dataView.getFloat64(aByteOffset);
+
+ throw new Error("Unsupported real size: " + aRealSize);
+ },
+
+ OBJECT_TYPE_BITS: {
+ SIMPLE: parseInt("0000", 2),
+ INTEGER: parseInt("0001", 2),
+ REAL: parseInt("0010", 2),
+ DATE: parseInt("0011", 2),
+ DATA: parseInt("0100", 2),
+ ASCII_STRING: parseInt("0101", 2),
+ UNICODE_STRING: parseInt("0110", 2),
+ UID: parseInt("1000", 2),
+ ARRAY: parseInt("1010", 2),
+ SET: parseInt("1100", 2),
+ DICTIONARY: parseInt("1101", 2)
+ },
+
+ ADDITIONAL_INFO_BITS: {
+ // Applies to OBJECT_TYPE_BITS.SIMPLE
+ NULL: parseInt("0000", 2),
+ FALSE: parseInt("1000", 2),
+ TRUE: parseInt("1001", 2),
+ FILL_BYTE: parseInt("1111", 2),
+ // Applies to OBJECT_TYPE_BITS.DATE
+ DATE: parseInt("0011", 2),
+ // Applies to OBJECT_TYPE_BITS.DATA, ASCII_STRING, UNICODE_STRING, ARRAY,
+ // SET and DICTIONARY.
+ LENGTH_INT_SIZE_FOLLOWS: parseInt("1111", 2)
+ },
+
+ /**
+ * Returns an object descriptor in the form of two integers: object type and
+ * additional info.
+ *
+ * @param aByteOffset
+ * the descriptor's offset.
+ * @return [objType, additionalInfo] - the object type and additional info.
+ * @see OBJECT_TYPE_BITS and ADDITIONAL_INFO_BITS
+ */
+ _readObjectDescriptor: function BPLR__readObjectDescriptor(aByteOffset) {
+ // The first four bits hold the object type. For some types, additional
+ // info is held in the other 4 bits.
+ let byte = this._readUnsignedInts(aByteOffset, 1, 1)[0];
+ return [(byte & 0xF0) >> 4, byte & 0x0F];
+ },
+
+ _readDate: function BPLR__readDate(aByteOffset) {
+ // That's the reference date of NSDate.
+ let date = new Date("1 January 2001, GMT");
+
+ // NSDate values are float values, but setSeconds takes an integer.
+ date.setMilliseconds(this._readReal(aByteOffset, 8) * 1000);
+ return date;
+ },
+
+ /**
+ * Reads a portion of the buffer as a string.
+ *
+ * @param aByteOffset
+ * The offset in the buffer at which the string starts
+ * @param aNumberOfChars
+ * The length of the string to be read (that is the number of
+ * characters, not bytes).
+ * @param aUnicode
+ * Whether or not it is a unicode string.
+ * @return the string read.
+ *
+ * @note this is tested to work well with unicode surrogate pairs. Because
+ * all unicode characters are read as 2-byte integers, unicode surrogate
+ * pairs are read from the buffer in the form of two integers, as required
+ * by String.fromCharCode.
+ */
+ _readString:
+ function BPLR__readString(aByteOffset, aNumberOfChars, aUnicode) {
+ let codes = this._readUnsignedInts(aByteOffset, aUnicode ? 2 : 1,
+ aNumberOfChars);
+ return codes.map(c => String.fromCharCode(c)).join("");
+ },
+
+ /**
+ * Reads an array of unsigned integers from the buffer. Integers larger than
+ * one byte are read in big endian form.
+ *
+ * @param aByteOffset
+ * The offset in the buffer at which the array starts.
+ * @param aIntSize
+ * The size of each int in the array.
+ * @param aLength
+ * The number of ints in the array.
+ * @param [optional] aBigIntAllowed (default: false)
+ * Whether or not to accept integers which outbounds JS limits for
+ * numbers (±2^53) in the form of a String.
+ * @return an array of integers (number primitive and/or Strings for large
+ * numbers (see header)).
+ * @throws if aBigIntAllowed is false and one of the integers in the array
+ * cannot be represented by a primitive js number.
+ */
+ _readUnsignedInts:
+ function BPLR__readUnsignedInts(aByteOffset, aIntSize, aLength, aBigIntAllowed) {
+ let uints = [];
+ for (let offset = aByteOffset;
+ offset < aByteOffset + aIntSize * aLength;
+ offset += aIntSize) {
+ if (aIntSize == 1) {
+ uints.push(this._dataView.getUint8(offset));
+ }
+ else if (aIntSize == 2) {
+ uints.push(this._dataView.getUint16(offset));
+ }
+ else if (aIntSize == 3) {
+ let int24 = Uint8Array(4);
+ int24[3] = 0;
+ int24[2] = this._dataView.getUint8(offset);
+ int24[1] = this._dataView.getUint8(offset + 1);
+ int24[0] = this._dataView.getUint8(offset + 2);
+ uints.push(Uint32Array(int24.buffer)[0]);
+ }
+ else if (aIntSize == 4) {
+ uints.push(this._dataView.getUint32(offset));
+ }
+ else if (aIntSize == 8) {
+ let lo = this._dataView.getUint32(offset + 4);
+ let hi = this._dataView.getUint32(offset);
+ let uint64 = ctypes.UInt64.join(hi, lo);
+ if (ctypes.UInt64.compare(uint64, this._JS_MAX_INT_UNSIGNED) == 1) {
+ if (aBigIntAllowed === true)
+ uints.push(PropertyListUtils.wrapInt64(uint64.toString()));
+ else
+ throw new Error("Integer too big to be read as float 64");
+ }
+ else {
+ uints.push(parseInt(uint64, 10));
+ }
+ }
+ else {
+ throw new Error("Unsupported size: " + aIntSize);
+ }
+ }
+
+ return uints;
+ },
+
+ /**
+ * Reads from the buffer the data object-count and the offset at which the
+ * first object starts.
+ *
+ * @param aObjectOffset
+ * the object's offset.
+ * @return [offset, count] - the offset in the buffer at which the first
+ * object in data starts, and the number of objects.
+ */
+ _readDataOffsetAndCount:
+ function BPLR__readDataOffsetAndCount(aObjectOffset) {
+ // The length of some objects in the data can be stored in two ways:
+ // * If it is small enough, it is stored in the second four bits of the
+ // object descriptors.
+ // * Otherwise, those bits are set to 1111, indicating that the next byte
+ // consists of the integer size of the data-length (also stored in the form
+ // of an object descriptor). The length follows this byte.
+ let [, maybeLength] = this._readObjectDescriptor(aObjectOffset);
+ if (maybeLength != this.ADDITIONAL_INFO_BITS.LENGTH_INT_SIZE_FOLLOWS)
+ return [aObjectOffset + 1, maybeLength];
+
+ let [, intSizeInfo] = this._readObjectDescriptor(aObjectOffset + 1);
+
+ // The int size is 2^intSizeInfo.
+ let intSize = Math.pow(2, intSizeInfo);
+ let dataLength = this._readUnsignedInts(aObjectOffset + 2, intSize, 1)[0];
+ return [aObjectOffset + 2 + intSize, dataLength];
+ },
+
+ /**
+ * Read array from the buffer and wrap it as a js array.
+ * @param aObjectOffset
+ * the offset in the buffer at which the array starts.
+ * @param aNumberOfObjects
+ * the number of objects in the array.
+ * @return a js array.
+ */
+ _wrapArray: function BPLR__wrapArray(aObjectOffset, aNumberOfObjects) {
+ let refs = this._readUnsignedInts(aObjectOffset,
+ this._objectRefSize,
+ aNumberOfObjects);
+
+ let array = new Array(aNumberOfObjects);
+ let readObjectBound = this._readObject.bind(this);
+
+ // Each index in the returned array is a lazy getter for its object.
+ Array.prototype.forEach.call(refs, function(ref, objIndex) {
+ Object.defineProperty(array, objIndex, {
+ get: function() {
+ delete array[objIndex];
+ return array[objIndex] = readObjectBound(ref);
+ },
+ configurable: true,
+ enumerable: true
+ });
+ }, this);
+ return array;
+ },
+
+ /**
+ * Reads dictionary from the buffer and wraps it as a Map object.
+ * @param aObjectOffset
+ * the offset in the buffer at which the dictionary starts
+ * @param aNumberOfObjects
+ * the number of keys in the dictionary
+ * @return Map-style dictionary.
+ */
+ _wrapDictionary: function(aObjectOffset, aNumberOfObjects) {
+ // A dictionary in the binary format is stored as a list of references to
+ // key-objects, followed by a list of references to the value-objects for
+ // those keys. The size of each list is aNumberOfObjects * this._objectRefSize.
+ let dict = new Proxy(new Map(), LazyMapProxyHandler());
+ if (aNumberOfObjects == 0)
+ return dict;
+
+ let keyObjsRefs = this._readUnsignedInts(aObjectOffset, this._objectRefSize,
+ aNumberOfObjects);
+ let valObjsRefs =
+ this._readUnsignedInts(aObjectOffset + aNumberOfObjects * this._objectRefSize,
+ this._objectRefSize, aNumberOfObjects);
+ for (let i = 0; i < aNumberOfObjects; i++) {
+ let key = this._readObject(keyObjsRefs[i]);
+ let readBound = this._readObject.bind(this, valObjsRefs[i]);
+
+ dict.setAsLazyGetter(key, readBound);
+ }
+ return dict;
+ },
+
+ /**
+ * Reads an object at the spcified index in the object table
+ * @param aObjectIndex
+ * index at the object table
+ * @return the property list object at the given index.
+ */
+ _readObject: function BPLR__readObject(aObjectIndex) {
+ // If the object was previously read, return the cached object.
+ if (this._objects[aObjectIndex] !== undefined)
+ return this._objects[aObjectIndex];
+
+ let objOffset = this._offsetTable[aObjectIndex];
+ let [objType, additionalInfo] = this._readObjectDescriptor(objOffset);
+ let value;
+ switch (objType) {
+ case this.OBJECT_TYPE_BITS.SIMPLE: {
+ switch (additionalInfo) {
+ case this.ADDITIONAL_INFO_BITS.NULL:
+ value = null;
+ break;
+ case this.ADDITIONAL_INFO_BITS.FILL_BYTE:
+ value = undefined;
+ break;
+ case this.ADDITIONAL_INFO_BITS.FALSE:
+ value = false;
+ break;
+ case this.ADDITIONAL_INFO_BITS.TRUE:
+ value = true;
+ break;
+ default:
+ throw new Error("Unexpected value!");
+ }
+ break;
+ }
+
+ case this.OBJECT_TYPE_BITS.INTEGER: {
+ // The integer is sized 2^additionalInfo.
+ let intSize = Math.pow(2, additionalInfo);
+
+ // For objects, 64-bit integers are always signed. Negative integers
+ // are always represented by a 64-bit integer.
+ if (intSize == 8)
+ value = this._readSignedInt64(objOffset + 1);
+ else
+ value = this._readUnsignedInts(objOffset + 1, intSize, 1, true)[0];
+ break;
+ }
+
+ case this.OBJECT_TYPE_BITS.REAL: {
+ // The real is sized 2^additionalInfo.
+ value = this._readReal(objOffset + 1, Math.pow(2, additionalInfo));
+ break;
+ }
+
+ case this.OBJECT_TYPE_BITS.DATE: {
+ if (additionalInfo != this.ADDITIONAL_INFO_BITS.DATE)
+ throw new Error("Unexpected value");
+
+ value = this._readDate(objOffset + 1);
+ break;
+ }
+
+ case this.OBJECT_TYPE_BITS.DATA: {
+ let [offset, bytesCount] = this._readDataOffsetAndCount(objOffset);
+ value = new Uint8Array(this._readUnsignedInts(offset, 1, bytesCount));
+ break;
+ }
+
+ case this.OBJECT_TYPE_BITS.ASCII_STRING: {
+ let [offset, charsCount] = this._readDataOffsetAndCount(objOffset);
+ value = this._readString(offset, charsCount, false);
+ break;
+ }
+
+ case this.OBJECT_TYPE_BITS.UNICODE_STRING: {
+ let [offset, unicharsCount] = this._readDataOffsetAndCount(objOffset);
+ value = this._readString(offset, unicharsCount, true);
+ break;
+ }
+
+ case this.OBJECT_TYPE_BITS.UID: {
+ // UIDs are only used in Keyed Archives, which are not yet supported.
+ throw new Error("Keyed Archives are not supported");
+ }
+
+ case this.OBJECT_TYPE_BITS.ARRAY:
+ case this.OBJECT_TYPE_BITS.SET: {
+ // Note: For now, we fallback to handle sets the same way we handle
+ // arrays. See comments in the header of this file.
+
+ // The bytes following the count are references to objects (indices).
+ // Each reference is an unsigned int with size=this._objectRefSize.
+ let [offset, objectsCount] = this._readDataOffsetAndCount(objOffset);
+ value = this._wrapArray(offset, objectsCount);
+ break;
+ }
+
+ case this.OBJECT_TYPE_BITS.DICTIONARY: {
+ let [offset, objectsCount] = this._readDataOffsetAndCount(objOffset);
+ value = this._wrapDictionary(offset, objectsCount);
+ break;
+ }
+
+ default: {
+ throw new Error("Unknown object type: " + objType);
+ }
+ }
+
+ return this._objects[aObjectIndex] = value;
+ }
+};
+
+/**
+ * Reader for XML property lists.
+ *
+ * @param aDOMDoc
+ * the DOM document to be read as a property list.
+ */
+function XMLPropertyListReader(aDOMDoc) {
+ let docElt = aDOMDoc.documentElement;
+ if (!docElt || docElt.localName != "plist" || !docElt.firstElementChild)
+ throw new Error("aDoc is not a property list document");
+
+ this._plistRootElement = docElt.firstElementChild;
+}
+
+XMLPropertyListReader.prototype = {
+ get root() {
+ return this._readObject(this._plistRootElement);
+ },
+
+ /**
+ * Convert a dom element to a property list object.
+ * @param aDOMElt
+ * a dom element in a xml tree of a property list.
+ * @return a js object representing the property list object.
+ */
+ _readObject: function XPLR__readObject(aDOMElt) {
+ switch (aDOMElt.localName) {
+ case "true":
+ return true;
+ case "false":
+ return false;
+ case "string":
+ case "key":
+ return aDOMElt.textContent;
+ case "integer":
+ return this._readInteger(aDOMElt);
+ case "real": {
+ let number = parseFloat(aDOMElt.textContent.trim());
+ if (isNaN(number))
+ throw "Could not parse float value";
+ return number;
+ }
+ case "date":
+ return new Date(aDOMElt.textContent);
+ case "data":
+ // Strip spaces and new lines.
+ let base64str = aDOMElt.textContent.replace(/\s*/g, "");
+ let decoded = atob(base64str);
+ return new Uint8Array(Array.from(decoded, c => c.charCodeAt(0)));
+ case "dict":
+ return this._wrapDictionary(aDOMElt);
+ case "array":
+ return this._wrapArray(aDOMElt);
+ default:
+ throw new Error("Unexpected tagname");
+ }
+ },
+
+ _readInteger: function XPLR__readInteger(aDOMElt) {
+ // The integer may outbound js's max/min integer value. We recognize this
+ // case by comparing the parsed number to the original string value.
+ // In case of an outbound, we fallback to return the number as a string.
+ let numberAsString = aDOMElt.textContent.toString();
+ let parsedNumber = parseInt(numberAsString, 10);
+ if (isNaN(parsedNumber))
+ throw new Error("Could not parse integer value");
+
+ if (parsedNumber.toString() == numberAsString)
+ return parsedNumber;
+
+ return PropertyListUtils.wrapInt64(numberAsString);
+ },
+
+ _wrapDictionary: function XPLR__wrapDictionary(aDOMElt) {
+ // <dict>
+ // <key>my true bool</key>
+ // <true/>
+ // <key>my string key</key>
+ // <string>My String Key</string>
+ // </dict>
+ if (aDOMElt.children.length % 2 != 0)
+ throw new Error("Invalid dictionary");
+ let dict = new Proxy(new Map(), LazyMapProxyHandler());
+ for (let i = 0; i < aDOMElt.children.length; i += 2) {
+ let keyElem = aDOMElt.children[i];
+ let valElem = aDOMElt.children[i + 1];
+
+ if (keyElem.localName != "key")
+ throw new Error("Invalid dictionary");
+
+ let keyName = this._readObject(keyElem);
+ let readBound = this._readObject.bind(this, valElem);
+
+ dict.setAsLazyGetter(keyName, readBound);
+ }
+ return dict;
+ },
+
+ _wrapArray: function XPLR__wrapArray(aDOMElt) {
+ // <array>
+ // <string>...</string>
+ // <integer></integer>
+ // <dict>
+ // ....
+ // </dict>
+ // </array>
+
+ // Each element in the array is a lazy getter for its property list object.
+ let array = [];
+ let readObjectBound = this._readObject.bind(this);
+ Array.prototype.forEach.call(aDOMElt.children, function(elem, elemIndex) {
+ Object.defineProperty(array, elemIndex, {
+ get: function() {
+ delete array[elemIndex];
+ return array[elemIndex] = readObjectBound(elem);
+ },
+ configurable: true,
+ enumerable: true
+ });
+ });
+ return array;
+ }
+};
+
+/**
+ * Simple handler method to proxy calls to dict/Map objects to implement the
+ * setAsLazyGetter API. With this, a value can be set as a function that will
+ * evaluate its value and only be called when it's first retrieved.
+ * @member _lazyGetters
+ * Set() object to hold keys invoking LazyGetter.
+ * @method get
+ * Trap for getting property values. Ensures that if a lazyGetter is present
+ * as value for key, then the function is evaluated, the value is cached,
+ * and its value will be returned.
+ * @param target
+ * Target object. (dict/Map)
+ * @param name
+ * Name of operation to be invoked on target.
+ * @param key
+ * Key to be set, retrieved or deleted. Keys are checked for laziness.
+ * @return Returns value of "name" property of target by default. Otherwise returns
+ * updated target.
+ */
+function LazyMapProxyHandler () {
+ return {
+ _lazyGetters: new Set(),
+ get: function(target, name) {
+ switch (name) {
+ case "setAsLazyGetter":
+ return (key, value) => {
+ this._lazyGetters.add(key);
+ target.set(key, value);
+ };
+ case "get":
+ return key => {
+ if (this._lazyGetters.has(key)) {
+ target.set(key, target.get(key)());
+ this._lazyGetters.delete(key);
+ }
+ return target.get(key);
+ };
+ case "delete":
+ return key => {
+ if (this._lazyGetters.has(key)) {
+ this._lazyGetters.delete(key);
+ }
+ return target.delete(key);
+ };
+ case "has":
+ return key => target.has(key);
+ default:
+ return target[name];
+ }
+ }
+ }
+}