1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
|
var ZipEntry = require("./zipEntry"),
Headers = require("./headers"),
Utils = require("./util");
module.exports = function(/*String|Buffer*/input, /*Number*/inputType) {
var entryList = [],
entryTable = {},
_comment = new Buffer(0),
filename = "",
fs = require("fs"),
inBuffer = null,
mainHeader = new Headers.MainHeader();
if (inputType == Utils.Constants.FILE) {
// is a filename
filename = input;
inBuffer = fs.readFileSync(filename);
readMainHeader();
} else if (inputType == Utils.Constants.BUFFER) {
// is a memory buffer
inBuffer = input;
readMainHeader();
} else {
// none. is a new file
}
function readEntries() {
entryTable = {};
entryList = new Array(mainHeader.diskEntries); // total number of entries
var index = mainHeader.offset; // offset of first CEN header
for(var i = 0; i < entryList.length; i++) {
var tmp = index,
entry = new ZipEntry(inBuffer);
entry.header = inBuffer.slice(tmp, tmp += Utils.Constants.CENHDR);
entry.entryName = inBuffer.slice(tmp, tmp += entry.header.fileNameLength);
if (entry.header.extraLength) {
entry.extra = inBuffer.slice(tmp, tmp += entry.header.extraLength);
}
if (entry.header.commentLength)
entry.comment = inBuffer.slice(tmp, tmp + entry.header.commentLength);
index += entry.header.entryHeaderSize;
entryList[i] = entry;
entryTable[entry.entryName] = entry;
}
}
function readMainHeader() {
var i = inBuffer.length - Utils.Constants.ENDHDR, // END header size
n = Math.max(0, i - 0xFFFF), // 0xFFFF is the max zip file comment length
endOffset = 0; // Start offset of the END header
for (i; i >= n; i--) {
if (inBuffer[i] != 0x50) continue; // quick check that the byte is 'P'
if (inBuffer.readUInt32LE(i) == Utils.Constants.ENDSIG) { // "PK\005\006"
endOffset = i;
break;
}
}
if (!endOffset)
throw Utils.Errors.INVALID_FORMAT;
mainHeader.loadFromBinary(inBuffer.slice(endOffset, endOffset + Utils.Constants.ENDHDR));
if (mainHeader.commentLength) {
_comment = inBuffer.slice(endOffset + Utils.Constants.ENDHDR);
}
readEntries();
}
return {
/**
* Returns an array of ZipEntry objects existent in the current opened archive
* @return Array
*/
get entries () {
return entryList;
},
/**
* Archive comment
* @return {String}
*/
get comment () { return _comment.toString(); },
set comment(val) {
mainHeader.commentLength = val.length;
_comment = val;
},
/**
* Returns a reference to the entry with the given name or null if entry is inexistent
*
* @param entryName
* @return ZipEntry
*/
getEntry : function(/*String*/entryName) {
return entryTable[entryName] || null;
},
/**
* Adds the given entry to the entry list
*
* @param entry
*/
setEntry : function(/*ZipEntry*/entry) {
entryList.push(entry);
entryTable[entry.entryName] = entry;
mainHeader.totalEntries = entryList.length;
},
/**
* Removes the entry with the given name from the entry list.
*
* If the entry is a directory, then all nested files and directories will be removed
* @param entryName
*/
deleteEntry : function(/*String*/entryName) {
var entry = entryTable[entryName];
if (entry && entry.isDirectory) {
var _self = this;
this.getEntryChildren(entry).forEach(function(child) {
if (child.entryName != entryName) {
_self.deleteEntry(child.entryName)
}
})
}
entryList.splice(entryList.indexOf(entry), 1);
delete(entryTable[entryName]);
mainHeader.totalEntries = entryList.length;
},
/**
* Iterates and returns all nested files and directories of the given entry
*
* @param entry
* @return Array
*/
getEntryChildren : function(/*ZipEntry*/entry) {
if (entry.isDirectory) {
var list = [],
name = entry.entryName,
len = name.length;
entryList.forEach(function(zipEntry) {
if (zipEntry.entryName.substr(0, len) == name) {
list.push(zipEntry);
}
});
return list;
}
return []
},
/**
* Returns the zip file
*
* @return Buffer
*/
compressToBuffer : function() {
if (entryList.length > 1) {
entryList.sort(function(a, b) {
var nameA = a.entryName.toLowerCase();
var nameB = b.entryName.toLowerCase();
if (nameA < nameB) {return -1}
if (nameA > nameB) {return 1}
return 0;
});
}
var totalSize = 0,
dataBlock = [],
entryHeaders = [],
dindex = 0;
mainHeader.size = 0;
mainHeader.offset = 0;
entryList.forEach(function(entry) {
entry.header.offset = dindex;
// compress data and set local and entry header accordingly. Reason why is called first
var compressedData = entry.getCompressedData();
// data header
var dataHeader = entry.header.dataHeaderToBinary();
var postHeader = new Buffer(entry.entryName + entry.extra.toString());
var dataLength = dataHeader.length + postHeader.length + compressedData.length;
dindex += dataLength;
dataBlock.push(dataHeader);
dataBlock.push(postHeader);
dataBlock.push(compressedData);
var entryHeader = entry.packHeader();
entryHeaders.push(entryHeader);
mainHeader.size += entryHeader.length;
totalSize += (dataLength + entryHeader.length);
});
totalSize += mainHeader.mainHeaderSize; // also includes zip file comment length
// point to end of data and begining of central directory first record
mainHeader.offset = dindex;
dindex = 0;
var outBuffer = new Buffer(totalSize);
dataBlock.forEach(function(content) {
content.copy(outBuffer, dindex); // write data blocks
dindex += content.length;
});
entryHeaders.forEach(function(content) {
content.copy(outBuffer, dindex); // write central directory entries
dindex += content.length;
});
var mh = mainHeader.toBinary();
if (_comment) {
_comment.copy(mh, Utils.Constants.ENDHDR); // add zip file comment
}
mh.copy(outBuffer, dindex); // write main header
return outBuffer
},
toAsyncBuffer : function(/*Function*/onSuccess,/*Function*/onFail,/*Function*/onItemStart,/*Function*/onItemEnd) {
if (entryList.length > 1) {
entryList.sort(function(a, b) {
var nameA = a.entryName.toLowerCase();
var nameB = b.entryName.toLowerCase();
if (nameA > nameB) {return -1}
if (nameA < nameB) {return 1}
return 0;
});
}
var totalSize = 0,
dataBlock = [],
entryHeaders = [],
dindex = 0;
mainHeader.size = 0;
mainHeader.offset = 0;
var compress=function(entryList){
var self=arguments.callee;
var entry;
if(entryList.length){
var entry=entryList.pop();
var name=entry.entryName + entry.extra.toString();
if(onItemStart)onItemStart(name);
entry.getCompressedDataAsync(function(compressedData){
if(onItemEnd)onItemEnd(name);
entry.header.offset = dindex;
// data header
var dataHeader = entry.header.dataHeaderToBinary();
var postHeader = new Buffer(name);
var dataLength = dataHeader.length + postHeader.length + compressedData.length;
dindex += dataLength;
dataBlock.push(dataHeader);
dataBlock.push(postHeader);
dataBlock.push(compressedData);
var entryHeader = entry.packHeader();
entryHeaders.push(entryHeader);
mainHeader.size += entryHeader.length;
totalSize += (dataLength + entryHeader.length);
if(entryList.length){
self(entryList);
}else{
totalSize += mainHeader.mainHeaderSize; // also includes zip file comment length
// point to end of data and begining of central directory first record
mainHeader.offset = dindex;
dindex = 0;
var outBuffer = new Buffer(totalSize);
dataBlock.forEach(function(content) {
content.copy(outBuffer, dindex); // write data blocks
dindex += content.length;
});
entryHeaders.forEach(function(content) {
content.copy(outBuffer, dindex); // write central directory entries
dindex += content.length;
});
var mh = mainHeader.toBinary();
if (_comment) {
_comment.copy(mh, Utils.Constants.ENDHDR); // add zip file comment
}
mh.copy(outBuffer, dindex); // write main header
onSuccess(outBuffer);
}
});
}
};
compress(entryList);
}
}
};
|
