358 lines
11 KiB
JavaScript
358 lines
11 KiB
JavaScript
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'use strict';
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// adapted from http://code.google.com/p/plist/source/browse/trunk/src/com/dd/plist/BinaryPropertyListParser.java
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var fs = require('fs');
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var bigInt = require("big-integer");
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var debug = false;
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exports.maxObjectSize = 100 * 1000 * 1000; // 100Meg
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exports.maxObjectCount = 32768;
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// EPOCH = new SimpleDateFormat("yyyy MM dd zzz").parse("2001 01 01 GMT").getTime();
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// ...but that's annoying in a static initializer because it can throw exceptions, ick.
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// So we just hardcode the correct value.
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var EPOCH = 978307200000;
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// UID object definition
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var UID = exports.UID = function(id) {
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this.UID = id;
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}
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var parseFile = exports.parseFile = function (fileNameOrBuffer, callback) {
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function tryParseBuffer(buffer) {
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var err = null;
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var result;
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try {
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result = parseBuffer(buffer);
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} catch (ex) {
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err = ex;
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}
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callback(err, result);
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}
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if (Buffer.isBuffer(fileNameOrBuffer)) {
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return tryParseBuffer(fileNameOrBuffer);
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} else {
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fs.readFile(fileNameOrBuffer, function (err, data) {
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if (err) { return callback(err); }
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tryParseBuffer(data);
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});
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}
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};
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var parseBuffer = exports.parseBuffer = function (buffer) {
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var result = {};
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// check header
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var header = buffer.slice(0, 'bplist'.length).toString('utf8');
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if (header !== 'bplist') {
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throw new Error("Invalid binary plist. Expected 'bplist' at offset 0.");
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}
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// Handle trailer, last 32 bytes of the file
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var trailer = buffer.slice(buffer.length - 32, buffer.length);
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// 6 null bytes (index 0 to 5)
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var offsetSize = trailer.readUInt8(6);
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if (debug) {
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console.log("offsetSize: " + offsetSize);
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}
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var objectRefSize = trailer.readUInt8(7);
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if (debug) {
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console.log("objectRefSize: " + objectRefSize);
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}
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var numObjects = readUInt64BE(trailer, 8);
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if (debug) {
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console.log("numObjects: " + numObjects);
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}
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var topObject = readUInt64BE(trailer, 16);
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if (debug) {
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console.log("topObject: " + topObject);
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}
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var offsetTableOffset = readUInt64BE(trailer, 24);
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if (debug) {
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console.log("offsetTableOffset: " + offsetTableOffset);
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}
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if (numObjects > exports.maxObjectCount) {
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throw new Error("maxObjectCount exceeded");
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}
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// Handle offset table
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var offsetTable = [];
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for (var i = 0; i < numObjects; i++) {
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var offsetBytes = buffer.slice(offsetTableOffset + i * offsetSize, offsetTableOffset + (i + 1) * offsetSize);
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offsetTable[i] = readUInt(offsetBytes, 0);
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if (debug) {
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console.log("Offset for Object #" + i + " is " + offsetTable[i] + " [" + offsetTable[i].toString(16) + "]");
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}
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}
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// Parses an object inside the currently parsed binary property list.
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// For the format specification check
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// <a href="http://www.opensource.apple.com/source/CF/CF-635/CFBinaryPList.c">
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// Apple's binary property list parser implementation</a>.
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function parseObject(tableOffset) {
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var offset = offsetTable[tableOffset];
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var type = buffer[offset];
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var objType = (type & 0xF0) >> 4; //First 4 bits
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var objInfo = (type & 0x0F); //Second 4 bits
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switch (objType) {
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case 0x0:
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return parseSimple();
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case 0x1:
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return parseInteger();
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case 0x8:
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return parseUID();
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case 0x2:
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return parseReal();
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case 0x3:
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return parseDate();
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case 0x4:
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return parseData();
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case 0x5: // ASCII
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return parsePlistString();
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case 0x6: // UTF-16
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return parsePlistString(true);
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case 0xA:
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return parseArray();
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case 0xD:
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return parseDictionary();
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default:
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throw new Error("Unhandled type 0x" + objType.toString(16));
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}
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function parseSimple() {
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//Simple
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switch (objInfo) {
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case 0x0: // null
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return null;
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case 0x8: // false
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return false;
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case 0x9: // true
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return true;
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case 0xF: // filler byte
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return null;
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default:
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throw new Error("Unhandled simple type 0x" + objType.toString(16));
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}
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}
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function bufferToHexString(buffer) {
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var str = '';
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var i;
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for (i = 0; i < buffer.length; i++) {
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if (buffer[i] != 0x00) {
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break;
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}
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}
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for (; i < buffer.length; i++) {
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var part = '00' + buffer[i].toString(16);
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str += part.substr(part.length - 2);
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}
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return str;
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}
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function parseInteger() {
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var length = Math.pow(2, objInfo);
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if (length > 4) {
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var data = buffer.slice(offset + 1, offset + 1 + length);
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var str = bufferToHexString(data);
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return bigInt(str, 16);
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} if (length < exports.maxObjectSize) {
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return readUInt(buffer.slice(offset + 1, offset + 1 + length));
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} else {
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throw new Error("To little heap space available! Wanted to read " + length + " bytes, but only " + exports.maxObjectSize + " are available.");
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}
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}
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function parseUID() {
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var length = objInfo + 1;
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if (length < exports.maxObjectSize) {
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return new UID(readUInt(buffer.slice(offset + 1, offset + 1 + length)));
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} else {
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throw new Error("To little heap space available! Wanted to read " + length + " bytes, but only " + exports.maxObjectSize + " are available.");
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}
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}
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function parseReal() {
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var length = Math.pow(2, objInfo);
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if (length < exports.maxObjectSize) {
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var realBuffer = buffer.slice(offset + 1, offset + 1 + length);
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if (length === 4) {
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return realBuffer.readFloatBE(0);
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}
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else if (length === 8) {
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return realBuffer.readDoubleBE(0);
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}
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} else {
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throw new Error("To little heap space available! Wanted to read " + length + " bytes, but only " + exports.maxObjectSize + " are available.");
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}
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}
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function parseDate() {
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if (objInfo != 0x3) {
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console.error("Unknown date type :" + objInfo + ". Parsing anyway...");
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}
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var dateBuffer = buffer.slice(offset + 1, offset + 9);
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return new Date(EPOCH + (1000 * dateBuffer.readDoubleBE(0)));
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}
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function parseData() {
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var dataoffset = 1;
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var length = objInfo;
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if (objInfo == 0xF) {
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var int_type = buffer[offset + 1];
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var intType = (int_type & 0xF0) / 0x10;
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if (intType != 0x1) {
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console.error("0x4: UNEXPECTED LENGTH-INT TYPE! " + intType);
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}
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var intInfo = int_type & 0x0F;
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var intLength = Math.pow(2, intInfo);
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dataoffset = 2 + intLength;
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if (intLength < 3) {
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length = readUInt(buffer.slice(offset + 2, offset + 2 + intLength));
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} else {
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length = readUInt(buffer.slice(offset + 2, offset + 2 + intLength));
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}
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}
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if (length < exports.maxObjectSize) {
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return buffer.slice(offset + dataoffset, offset + dataoffset + length);
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} else {
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throw new Error("To little heap space available! Wanted to read " + length + " bytes, but only " + exports.maxObjectSize + " are available.");
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}
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}
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function parsePlistString (isUtf16) {
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isUtf16 = isUtf16 || 0;
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var enc = "utf8";
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var length = objInfo;
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var stroffset = 1;
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if (objInfo == 0xF) {
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var int_type = buffer[offset + 1];
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var intType = (int_type & 0xF0) / 0x10;
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if (intType != 0x1) {
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console.err("UNEXPECTED LENGTH-INT TYPE! " + intType);
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}
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var intInfo = int_type & 0x0F;
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var intLength = Math.pow(2, intInfo);
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var stroffset = 2 + intLength;
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if (intLength < 3) {
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length = readUInt(buffer.slice(offset + 2, offset + 2 + intLength));
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} else {
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length = readUInt(buffer.slice(offset + 2, offset + 2 + intLength));
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}
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}
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// length is String length -> to get byte length multiply by 2, as 1 character takes 2 bytes in UTF-16
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length *= (isUtf16 + 1);
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if (length < exports.maxObjectSize) {
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var plistString = new Buffer(buffer.slice(offset + stroffset, offset + stroffset + length));
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if (isUtf16) {
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plistString = swapBytes(plistString);
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enc = "ucs2";
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}
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return plistString.toString(enc);
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} else {
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throw new Error("To little heap space available! Wanted to read " + length + " bytes, but only " + exports.maxObjectSize + " are available.");
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}
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}
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function parseArray() {
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var length = objInfo;
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var arrayoffset = 1;
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if (objInfo == 0xF) {
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var int_type = buffer[offset + 1];
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var intType = (int_type & 0xF0) / 0x10;
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if (intType != 0x1) {
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console.error("0xa: UNEXPECTED LENGTH-INT TYPE! " + intType);
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}
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var intInfo = int_type & 0x0F;
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var intLength = Math.pow(2, intInfo);
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arrayoffset = 2 + intLength;
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if (intLength < 3) {
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length = readUInt(buffer.slice(offset + 2, offset + 2 + intLength));
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} else {
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length = readUInt(buffer.slice(offset + 2, offset + 2 + intLength));
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}
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}
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if (length * objectRefSize > exports.maxObjectSize) {
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throw new Error("To little heap space available!");
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}
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var array = [];
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for (var i = 0; i < length; i++) {
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var objRef = readUInt(buffer.slice(offset + arrayoffset + i * objectRefSize, offset + arrayoffset + (i + 1) * objectRefSize));
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array[i] = parseObject(objRef);
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}
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return array;
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}
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function parseDictionary() {
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var length = objInfo;
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var dictoffset = 1;
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if (objInfo == 0xF) {
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var int_type = buffer[offset + 1];
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var intType = (int_type & 0xF0) / 0x10;
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if (intType != 0x1) {
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console.error("0xD: UNEXPECTED LENGTH-INT TYPE! " + intType);
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}
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var intInfo = int_type & 0x0F;
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var intLength = Math.pow(2, intInfo);
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dictoffset = 2 + intLength;
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if (intLength < 3) {
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length = readUInt(buffer.slice(offset + 2, offset + 2 + intLength));
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} else {
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length = readUInt(buffer.slice(offset + 2, offset + 2 + intLength));
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}
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}
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if (length * 2 * objectRefSize > exports.maxObjectSize) {
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throw new Error("To little heap space available!");
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}
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if (debug) {
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console.log("Parsing dictionary #" + tableOffset);
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}
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var dict = {};
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for (var i = 0; i < length; i++) {
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var keyRef = readUInt(buffer.slice(offset + dictoffset + i * objectRefSize, offset + dictoffset + (i + 1) * objectRefSize));
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var valRef = readUInt(buffer.slice(offset + dictoffset + (length * objectRefSize) + i * objectRefSize, offset + dictoffset + (length * objectRefSize) + (i + 1) * objectRefSize));
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var key = parseObject(keyRef);
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var val = parseObject(valRef);
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if (debug) {
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console.log(" DICT #" + tableOffset + ": Mapped " + key + " to " + val);
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}
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dict[key] = val;
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}
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return dict;
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}
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}
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return [ parseObject(topObject) ];
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};
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function readUInt(buffer, start) {
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start = start || 0;
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var l = 0;
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for (var i = start; i < buffer.length; i++) {
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l <<= 8;
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l |= buffer[i] & 0xFF;
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}
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return l;
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}
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// we're just going to toss the high order bits because javascript doesn't have 64-bit ints
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function readUInt64BE(buffer, start) {
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var data = buffer.slice(start, start + 8);
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return data.readUInt32BE(4, 8);
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}
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function swapBytes(buffer) {
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var len = buffer.length;
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for (var i = 0; i < len; i += 2) {
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var a = buffer[i];
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buffer[i] = buffer[i+1];
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buffer[i+1] = a;
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}
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return buffer;
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}
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