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- 'use strict';
- var readerFor = require('./reader/readerFor');
- var utils = require('./utils');
- var CompressedObject = require('./compressedObject');
- var crc32fn = require('./crc32');
- var utf8 = require('./utf8');
- var compressions = require('./compressions');
- var support = require('./support');
-
- var MADE_BY_DOS = 0x00;
- var MADE_BY_UNIX = 0x03;
-
-
- var findCompression = function(compressionMethod) {
- for (var method in compressions) {
- if (!compressions.hasOwnProperty(method)) {
- continue;
- }
- if (compressions[method].magic === compressionMethod) {
- return compressions[method];
- }
- }
- return null;
- };
-
-
-
- function ZipEntry(options, loadOptions) {
- this.options = options;
- this.loadOptions = loadOptions;
- }
- ZipEntry.prototype = {
-
-
- isEncrypted: function() {
-
- return (this.bitFlag & 0x0001) === 0x0001;
- },
-
-
- useUTF8: function() {
-
- return (this.bitFlag & 0x0800) === 0x0800;
- },
-
-
- readLocalPart: function(reader) {
- var compression, localExtraFieldsLength;
-
-
-
-
-
-
- reader.skip(22);
-
-
-
-
-
-
-
-
-
-
-
- this.fileNameLength = reader.readInt(2);
- localExtraFieldsLength = reader.readInt(2);
-
- this.fileName = reader.readData(this.fileNameLength);
- reader.skip(localExtraFieldsLength);
-
- if (this.compressedSize === -1 || this.uncompressedSize === -1) {
- throw new Error("Bug or corrupted zip : didn't get enough informations from the central directory " + "(compressedSize === -1 || uncompressedSize === -1)");
- }
-
- compression = findCompression(this.compressionMethod);
- if (compression === null) {
- throw new Error("Corrupted zip : compression " + utils.pretty(this.compressionMethod) + " unknown (inner file : " + utils.transformTo("string", this.fileName) + ")");
- }
- this.decompressed = new CompressedObject(this.compressedSize, this.uncompressedSize, this.crc32, compression, reader.readData(this.compressedSize));
- },
-
-
-
- readCentralPart: function(reader) {
- this.versionMadeBy = reader.readInt(2);
- reader.skip(2);
-
- this.bitFlag = reader.readInt(2);
- this.compressionMethod = reader.readString(2);
- this.date = reader.readDate();
- this.crc32 = reader.readInt(4);
- this.compressedSize = reader.readInt(4);
- this.uncompressedSize = reader.readInt(4);
- var fileNameLength = reader.readInt(2);
- this.extraFieldsLength = reader.readInt(2);
- this.fileCommentLength = reader.readInt(2);
- this.diskNumberStart = reader.readInt(2);
- this.internalFileAttributes = reader.readInt(2);
- this.externalFileAttributes = reader.readInt(4);
- this.localHeaderOffset = reader.readInt(4);
-
- if (this.isEncrypted()) {
- throw new Error("Encrypted zip are not supported");
- }
-
-
- reader.skip(fileNameLength);
- this.readExtraFields(reader);
- this.parseZIP64ExtraField(reader);
- this.fileComment = reader.readData(this.fileCommentLength);
- },
-
-
-
- processAttributes: function () {
- this.unixPermissions = null;
- this.dosPermissions = null;
- var madeBy = this.versionMadeBy >> 8;
-
-
-
-
- this.dir = this.externalFileAttributes & 0x0010 ? true : false;
-
- if(madeBy === MADE_BY_DOS) {
-
- this.dosPermissions = this.externalFileAttributes & 0x3F;
- }
-
- if(madeBy === MADE_BY_UNIX) {
- this.unixPermissions = (this.externalFileAttributes >> 16) & 0xFFFF;
-
- }
-
-
- if (!this.dir && this.fileNameStr.slice(-1) === '/') {
- this.dir = true;
- }
- },
-
-
-
- parseZIP64ExtraField: function(reader) {
-
- if (!this.extraFields[0x0001]) {
- return;
- }
-
-
- var extraReader = readerFor(this.extraFields[0x0001].value);
-
-
-
- if (this.uncompressedSize === utils.MAX_VALUE_32BITS) {
- this.uncompressedSize = extraReader.readInt(8);
- }
- if (this.compressedSize === utils.MAX_VALUE_32BITS) {
- this.compressedSize = extraReader.readInt(8);
- }
- if (this.localHeaderOffset === utils.MAX_VALUE_32BITS) {
- this.localHeaderOffset = extraReader.readInt(8);
- }
- if (this.diskNumberStart === utils.MAX_VALUE_32BITS) {
- this.diskNumberStart = extraReader.readInt(4);
- }
- },
-
-
- readExtraFields: function(reader) {
- var end = reader.index + this.extraFieldsLength,
- extraFieldId,
- extraFieldLength,
- extraFieldValue;
-
- if (!this.extraFields) {
- this.extraFields = {};
- }
-
- while (reader.index < end) {
- extraFieldId = reader.readInt(2);
- extraFieldLength = reader.readInt(2);
- extraFieldValue = reader.readData(extraFieldLength);
-
- this.extraFields[extraFieldId] = {
- id: extraFieldId,
- length: extraFieldLength,
- value: extraFieldValue
- };
- }
- },
-
-
- handleUTF8: function() {
- var decodeParamType = support.uint8array ? "uint8array" : "array";
- if (this.useUTF8()) {
- this.fileNameStr = utf8.utf8decode(this.fileName);
- this.fileCommentStr = utf8.utf8decode(this.fileComment);
- } else {
- var upath = this.findExtraFieldUnicodePath();
- if (upath !== null) {
- this.fileNameStr = upath;
- } else {
-
- var fileNameByteArray = utils.transformTo(decodeParamType, this.fileName);
- this.fileNameStr = this.loadOptions.decodeFileName(fileNameByteArray);
- }
-
- var ucomment = this.findExtraFieldUnicodeComment();
- if (ucomment !== null) {
- this.fileCommentStr = ucomment;
- } else {
-
- var commentByteArray = utils.transformTo(decodeParamType, this.fileComment);
- this.fileCommentStr = this.loadOptions.decodeFileName(commentByteArray);
- }
- }
- },
-
-
-
- findExtraFieldUnicodePath: function() {
- var upathField = this.extraFields[0x7075];
- if (upathField) {
- var extraReader = readerFor(upathField.value);
-
-
- if (extraReader.readInt(1) !== 1) {
- return null;
- }
-
-
- if (crc32fn(this.fileName) !== extraReader.readInt(4)) {
- return null;
- }
-
- return utf8.utf8decode(extraReader.readData(upathField.length - 5));
- }
- return null;
- },
-
-
-
- findExtraFieldUnicodeComment: function() {
- var ucommentField = this.extraFields[0x6375];
- if (ucommentField) {
- var extraReader = readerFor(ucommentField.value);
-
-
- if (extraReader.readInt(1) !== 1) {
- return null;
- }
-
-
- if (crc32fn(this.fileComment) !== extraReader.readInt(4)) {
- return null;
- }
-
- return utf8.utf8decode(extraReader.readData(ucommentField.length - 5));
- }
- return null;
- }
- };
- module.exports = ZipEntry;
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