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Diffstat (limited to 'afb-client/bower_components/jszip/lib/zipEntries.js')
| -rw-r--r-- | afb-client/bower_components/jszip/lib/zipEntries.js | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/afb-client/bower_components/jszip/lib/zipEntries.js b/afb-client/bower_components/jszip/lib/zipEntries.js new file mode 100644 index 0000000..4b82561 --- /dev/null +++ b/afb-client/bower_components/jszip/lib/zipEntries.js @@ -0,0 +1,221 @@ +'use strict'; +var StringReader = require('./stringReader'); +var NodeBufferReader = require('./nodeBufferReader'); +var Uint8ArrayReader = require('./uint8ArrayReader'); +var utils = require('./utils'); +var sig = require('./signature'); +var ZipEntry = require('./zipEntry'); +var support = require('./support'); +var jszipProto = require('./object'); +// class ZipEntries {{{ +/** + * All the entries in the zip file. + * @constructor + * @param {String|ArrayBuffer|Uint8Array} data the binary stream to load. + * @param {Object} loadOptions Options for loading the stream. + */ +function ZipEntries(data, loadOptions) { + this.files = []; + this.loadOptions = loadOptions; + if (data) { + this.load(data); + } +} +ZipEntries.prototype = { + /** + * Check that the reader is on the speficied signature. + * @param {string} expectedSignature the expected signature. + * @throws {Error} if it is an other signature. + */ + checkSignature: function(expectedSignature) { + var signature = this.reader.readString(4); + if (signature !== expectedSignature) { + throw new Error("Corrupted zip or bug : unexpected signature " + "(" + utils.pretty(signature) + ", expected " + utils.pretty(expectedSignature) + ")"); + } + }, + /** + * Read the end of the central directory. + */ + readBlockEndOfCentral: function() { + this.diskNumber = this.reader.readInt(2); + this.diskWithCentralDirStart = this.reader.readInt(2); + this.centralDirRecordsOnThisDisk = this.reader.readInt(2); + this.centralDirRecords = this.reader.readInt(2); + this.centralDirSize = this.reader.readInt(4); + this.centralDirOffset = this.reader.readInt(4); + + this.zipCommentLength = this.reader.readInt(2); + // warning : the encoding depends of the system locale + // On a linux machine with LANG=en_US.utf8, this field is utf8 encoded. + // On a windows machine, this field is encoded with the localized windows code page. + this.zipComment = this.reader.readString(this.zipCommentLength); + // To get consistent behavior with the generation part, we will assume that + // this is utf8 encoded. + this.zipComment = jszipProto.utf8decode(this.zipComment); + }, + /** + * Read the end of the Zip 64 central directory. + * Not merged with the method readEndOfCentral : + * The end of central can coexist with its Zip64 brother, + * I don't want to read the wrong number of bytes ! + */ + readBlockZip64EndOfCentral: function() { + this.zip64EndOfCentralSize = this.reader.readInt(8); + this.versionMadeBy = this.reader.readString(2); + this.versionNeeded = this.reader.readInt(2); + this.diskNumber = this.reader.readInt(4); + this.diskWithCentralDirStart = this.reader.readInt(4); + this.centralDirRecordsOnThisDisk = this.reader.readInt(8); + this.centralDirRecords = this.reader.readInt(8); + this.centralDirSize = this.reader.readInt(8); + this.centralDirOffset = this.reader.readInt(8); + + this.zip64ExtensibleData = {}; + var extraDataSize = this.zip64EndOfCentralSize - 44, + index = 0, + extraFieldId, + extraFieldLength, + extraFieldValue; + while (index < extraDataSize) { + extraFieldId = this.reader.readInt(2); + extraFieldLength = this.reader.readInt(4); + extraFieldValue = this.reader.readString(extraFieldLength); + this.zip64ExtensibleData[extraFieldId] = { + id: extraFieldId, + length: extraFieldLength, + value: extraFieldValue + }; + } + }, + /** + * Read the end of the Zip 64 central directory locator. + */ + readBlockZip64EndOfCentralLocator: function() { + this.diskWithZip64CentralDirStart = this.reader.readInt(4); + this.relativeOffsetEndOfZip64CentralDir = this.reader.readInt(8); + this.disksCount = this.reader.readInt(4); + if (this.disksCount > 1) { + throw new Error("Multi-volumes zip are not supported"); + } + }, + /** + * Read the local files, based on the offset read in the central part. + */ + readLocalFiles: function() { + var i, file; + for (i = 0; i < this.files.length; i++) { + file = this.files[i]; + this.reader.setIndex(file.localHeaderOffset); + this.checkSignature(sig.LOCAL_FILE_HEADER); + file.readLocalPart(this.reader); + file.handleUTF8(); + file.processAttributes(); + } + }, + /** + * Read the central directory. + */ + readCentralDir: function() { + var file; + + this.reader.setIndex(this.centralDirOffset); + while (this.reader.readString(4) === sig.CENTRAL_FILE_HEADER) { + file = new ZipEntry({ + zip64: this.zip64 + }, this.loadOptions); + file.readCentralPart(this.reader); + this.files.push(file); + } + }, + /** + * Read the end of central directory. + */ + readEndOfCentral: function() { + var offset = this.reader.lastIndexOfSignature(sig.CENTRAL_DIRECTORY_END); + if (offset === -1) { + // Check if the content is a truncated zip or complete garbage. + // A "LOCAL_FILE_HEADER" is not required at the beginning (auto + // extractible zip for example) but it can give a good hint. + // If an ajax request was used without responseType, we will also + // get unreadable data. + var isGarbage = true; + try { + this.reader.setIndex(0); + this.checkSignature(sig.LOCAL_FILE_HEADER); + isGarbage = false; + } catch (e) {} + + if (isGarbage) { + throw new Error("Can't find end of central directory : is this a zip file ? " + + "If it is, see http://stuk.github.io/jszip/documentation/howto/read_zip.html"); + } else { + throw new Error("Corrupted zip : can't find end of central directory"); + } + } + this.reader.setIndex(offset); + this.checkSignature(sig.CENTRAL_DIRECTORY_END); + this.readBlockEndOfCentral(); + + + /* extract from the zip spec : + 4) If one of the fields in the end of central directory + record is too small to hold required data, the field + should be set to -1 (0xFFFF or 0xFFFFFFFF) and the + ZIP64 format record should be created. + 5) The end of central directory record and the + Zip64 end of central directory locator record must + reside on the same disk when splitting or spanning + an archive. + */ + if (this.diskNumber === utils.MAX_VALUE_16BITS || this.diskWithCentralDirStart === utils.MAX_VALUE_16BITS || this.centralDirRecordsOnThisDisk === utils.MAX_VALUE_16BITS || this.centralDirRecords === utils.MAX_VALUE_16BITS || this.centralDirSize === utils.MAX_VALUE_32BITS || this.centralDirOffset === utils.MAX_VALUE_32BITS) { + this.zip64 = true; + + /* + Warning : the zip64 extension is supported, but ONLY if the 64bits integer read from + the zip file can fit into a 32bits integer. This cannot be solved : Javascript represents + all numbers as 64-bit double precision IEEE 754 floating point numbers. + So, we have 53bits for integers and bitwise operations treat everything as 32bits. + see https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Operators/Bitwise_Operators + and http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf section 8.5 + */ + + // should look for a zip64 EOCD locator + offset = this.reader.lastIndexOfSignature(sig.ZIP64_CENTRAL_DIRECTORY_LOCATOR); + if (offset === -1) { + throw new Error("Corrupted zip : can't find the ZIP64 end of central directory locator"); + } + this.reader.setIndex(offset); + this.checkSignature(sig.ZIP64_CENTRAL_DIRECTORY_LOCATOR); + this.readBlockZip64EndOfCentralLocator(); + + // now the zip64 EOCD record + this.reader.setIndex(this.relativeOffsetEndOfZip64CentralDir); + this.checkSignature(sig.ZIP64_CENTRAL_DIRECTORY_END); + this.readBlockZip64EndOfCentral(); + } + }, + prepareReader: function(data) { + var type = utils.getTypeOf(data); + if (type === "string" && !support.uint8array) { + this.reader = new StringReader(data, this.loadOptions.optimizedBinaryString); + } + else if (type === "nodebuffer") { + this.reader = new NodeBufferReader(data); + } + else { + this.reader = new Uint8ArrayReader(utils.transformTo("uint8array", data)); + } + }, + /** + * Read a zip file and create ZipEntries. + * @param {String|ArrayBuffer|Uint8Array|Buffer} data the binary string representing a zip file. + */ + load: function(data) { + this.prepareReader(data); + this.readEndOfCentral(); + this.readCentralDir(); + this.readLocalFiles(); + } +}; +// }}} end of ZipEntries +module.exports = ZipEntries; |