1 /*global runtime core*/
2 /*jslint bitwise: false*/
6 * Copyright (c) 2010 Jos van den Oever
7 * Licensed under the ... License:
9 * Project home: http://www.odfkit.org/
12 runtime.loadClass("core.RawInflate");
13 runtime.loadClass("core.ByteArray");
17 * @param {!string} url path to zip file, should be readable by the runtime
18 * @param {?function(?string, !core.Zip):undefined} entriesReadCallback callback
20 * has loaded this list of entries, the arguments are a string that
21 * indicates error if present and the created object
23 core.Zip = function Zip(url, entriesReadCallback) {
24 var entries, filesize, nEntries,
25 inflate = new core.RawInflate().inflate,
29 // Calculate the crc32 polynomial of a string
32 // discuss at: http:\/\/phpjs.org\/functions\/crc32
33 // + original by: Webtoolkit.info (http:\/\/www.webtoolkit.info\/)
34 // + improved by: T0bsn
35 // - depends on: utf8_encode
36 // * example 1: crc32('Kevin van Zonneveld');
37 // * returns 1: 1249991249
38 var table = [0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D],
44 for (i = 0, iTop = str.length; i < iTop; i += 1) {
45 y = (crc ^ str.charCodeAt(i)) & 0xFF;
47 crc = (crc >>> 8) ^ x;
53 * @param {!number} dostime
56 function dosTime2Date(dostime) {
57 var year = ((dostime >> 25) & 0x7f) + 1980,
58 month = ((dostime >> 21) & 0x0f) - 1,
59 mday = (dostime >> 16) & 0x1f,
60 hour = (dostime >> 11) & 0x0f,
61 min = (dostime >> 5) & 0x3f,
62 sec = (dostime & 0x1f) << 1,
63 d = new Date(year, month, mday, hour, min, sec);
70 function date2DosTime(date) {
71 var y = date.getFullYear();
73 ((y - 1980) << 25) | ((date.getMonth() + 1) << 21) |
74 (date.getDate() << 16) | (date.getHours() << 11) |
75 (date.getMinutes() << 5) | (date.getSeconds() >> 1);
79 * @param {!string} url
80 * @param {!core.ByteArray} stream
82 function ZipEntry(url, stream) {
83 var sig = stream.readUInt32LE(),
84 namelen, extralen, commentlen,
91 function handleEntryData(data, callback) {
92 var stream = new core.ByteArray(data),
93 sig = stream.readUInt32LE(),
94 filenamelen, extralen;
95 if (sig !== 0x04034b50) {
96 callback('File entry signature is wrong.' + sig + ' ' +
101 filenamelen = stream.readUInt16LE();
102 extralen = stream.readUInt16LE();
103 stream.pos += filenamelen + extralen;
104 if (compressionMethod) {
105 data = stream.data.substr(stream.pos, compressedSize);
106 if (compressedSize !== data.length) {
107 callback("The amount of compressed bytes read was " +
108 data.length + " instead of " + compressedSize +
109 " for " + entry.filename + " in " + url + ".");
112 data = inflate(data);
114 data = stream.data.substr(stream.pos, uncompressedSize);
116 if (uncompressedSize !== data.length) {
117 callback("The amount of bytes read was " + data.length +
118 " instead of " + uncompressedSize + " for " +
119 entry.filename + " in " + url + ".");
123 * This check is disabled for performance reasons
124 if (crc !== crc32(data)) {
125 runtime.log("Warning: CRC32 for " + entry.filename +
130 callback(null, data);
133 * @param {!function(?string, ?string)} callback with err and data
134 * @return {undefined}
136 function load(callback) {
137 // if data has already been downloaded, use that
138 if (entry.data !== undefined) {
139 callback(null, entry.data);
142 // the 256 at the end is security for when local extra field is
144 var size = compressedSize + 34 + namelen + extralen + 256;
145 runtime.read(url, offset, size, function (err, data) {
149 handleEntryData(data, callback);
158 if (sig !== 0x02014b50) {
160 "Central directory entry has wrong signature at position " +
161 (stream.pos - 4) + ' for file "' + url + '": ' +
165 // stream should be positioned at the start of the CDS entry for the
168 compressionMethod = stream.readUInt16LE();
169 this.date = dosTime2Date(stream.readUInt32LE());
170 crc = stream.readUInt32LE();
171 compressedSize = stream.readUInt32LE();
172 uncompressedSize = stream.readUInt32LE();
173 namelen = stream.readUInt16LE();
174 extralen = stream.readUInt16LE();
175 commentlen = stream.readUInt16LE();
177 offset = stream.readUInt32LE();
178 this.filename = stream.data.substr(stream.pos, namelen);
179 stream.pos += namelen + extralen + commentlen;
182 * @param {!string} data
183 * @param {!function(?string, !core.Zip)} callback
184 * @return {undefined}
186 function handleCentralDirectory(data, callback) {
187 // parse the central directory
188 var stream = new core.ByteArray(data), i, e;
190 for (i = 0; i < nEntries; i += 1) {
191 e = new ZipEntry(url, stream);
193 callback(e.error, zip);
196 entries[entries.length] = e;
198 // report that entries are listed and no error occured
202 * @param {!string} data
203 * @param {!function(?string, !core.Zip)} callback
204 * @return {undefined}
206 function handleCentralDirectoryEnd(data, callback) {
207 if (data.length !== 22) {
208 callback("Central directory length should be 22.", zip);
211 var stream = new core.ByteArray(data), sig, disk, cddisk, diskNEntries,
213 sig = stream.readUInt32LE();
214 if (sig !== 0x06054b50) {
215 callback('Central directory signature is wrong: ' + sig, zip);
218 disk = stream.readUInt16LE();
220 callback('Zip files with non-zero disk numbers are not supported.',
224 cddisk = stream.readUInt16LE();
226 callback('Zip files with non-zero disk numbers are not supported.',
230 diskNEntries = stream.readUInt16LE();
231 nEntries = stream.readUInt16LE();
232 if (diskNEntries !== nEntries) {
233 callback('Number of entries is inconsistent.', zip);
236 cdsSize = stream.readUInt32LE();
237 cdsOffset = stream.readUInt16LE();
238 cdsOffset = filesize - 22 - cdsSize;
240 // for some reason cdsOffset is not always equal to offset calculated
241 // from the central directory size. The latter is reliable.
242 runtime.read(url, cdsOffset, filesize - cdsOffset,
243 function (err, data) {
244 handleCentralDirectory(data, callback);
248 * @param {!string} filename
249 * @param {!function(?string, ?string)} callback receiving err and data
250 * @return {undefined}
252 function load(filename, callback) {
256 for (i = 0; i < entries.length; i += 1) {
258 if (e.filename === filename) {
265 callback(null, entry.data);
267 entry.load(callback);
270 callback(filename + " not found.", null);
274 * Add or replace an entry to the zip file.
275 * This data is not stored to disk yet, and therefore, no callback is
277 * @param {!string} filename
278 * @param {!string} data
279 * @param {!boolean} compressed
280 * @param {!Date} date
281 * @return {undefined}
283 function save(filename, data, compressed, date) {
284 var e = { filename: filename, data: data, compressed: compressed,
287 for (i = 0; i < entries.length; i += 1) {
289 if (olde.filename === filename) {
296 function uint32LE(value) {
297 return String.fromCharCode(value & 0xff) +
298 String.fromCharCode((value>>8) & 0xff) +
299 String.fromCharCode((value>>16) & 0xff) +
300 String.fromCharCode((value>>24) & 0xff);
302 function uint16LE(value) {
303 return String.fromCharCode(value & 0xff) +
304 String.fromCharCode((value>>8) & 0xff);
307 * @param {!ZipEntry} entry
310 function writeEntry(entry) {
311 // each entry is currently stored uncompressed
312 var data = "PK\x03\x04\x0a\x00\x00\x00\x00\x00";
313 data += uint32LE(date2DosTime(entry.date));
314 data += uint32LE(crc32(entry.data));
315 data += uint32LE(entry.data.length); // compressedSize
316 data += uint32LE(entry.data.length); // uncompressedSize
317 data += uint16LE(entry.filename.length); // namelen
318 data += uint16LE(0); // extralen
319 data += entry.filename;
324 * @param {!ZipEntry} entry
325 * @param {!number} offset
328 function writeCODEntry(entry, offset) {
329 // each entry is currently stored uncompressed
330 var data = "PK\x01\x02\x1e\x03\x0a\x00\x00\x00\x00\x00";
331 // mtime = mdate = 0 for now
332 data += uint32LE(date2DosTime(entry.date));
333 data += uint32LE(crc32(entry.data));
334 data += uint32LE(entry.data.length); // compressedSize
335 data += uint32LE(entry.data.length); // uncompressedSize
336 data += uint16LE(entry.filename.length); // namelen
337 // extralen, commalen, diskno, file attributes
338 data += "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
339 data += uint32LE(offset);
340 data += entry.filename;
344 * Write the zipfile to the given path.
345 * @param {!function(?string):undefined} callback receiving possible err
346 * @return {undefined}
348 function write(callback) {
349 var data = "", i, e, codoffset, codsize,
352 for (i = 0; i < entries.length; i += 1) {
353 data += writeEntry(entries[i]);
354 offsets.push(data.length);
356 // write central directory
357 codoffset = data.length;
358 for (i = 0; i < entries.length; i += 1) {
360 data += writeCODEntry(e, offsets[i]);
362 codsize = data.length - codoffset;
363 data += "PK\x05\x06\x00\x00\x00\x00";
364 data += uint16LE(entries.length);
365 data += uint16LE(entries.length);
366 data += uint32LE(codsize);
367 data += uint32LE(codoffset);
369 runtime.writeFile(url, data, "binary", callback);
375 this.getEntries = function () {
376 return entries.slice();
379 // determine the file size
381 // if no callback is defined, this is a new file
382 if (entriesReadCallback === null) {
386 runtime.getFileSize(url, function (size) {
389 entriesReadCallback("File '" + url + "' cannot be read.", zip);
391 runtime.read(url, filesize - 22, 22, function (err, data) {
392 // todo: refactor entire zip class
393 if (err || entriesReadCallback === null) {
394 entriesReadCallback(err, zip);
396 handleCentralDirectoryEnd(data, entriesReadCallback);