private void buildIndex() throws IOException {
int entryCount = get2ByteLittleEndian(zipDir, 0);
// Add each of the files
if (entryCount > 0) {
directories = new HashMap<RelativeDirectory, DirectoryEntry>();
ArrayList<Entry> entryList = new ArrayList<Entry>();
int pos = 2;
for (int i = 0; i < entryCount; i++) {
pos = readEntry(pos, entryList, directories);
}
// Add the accumulated dirs into the same list
for (RelativeDirectory d : directories.keySet()) {
// use shared RelativeDirectory objects for parent dirs
RelativeDirectory parent = getRelativeDirectory(d.dirname().getPath());
String file = d.basename();
Entry zipFileIndexEntry = new Entry(parent, file);
zipFileIndexEntry.isDir = true;
entryList.add(zipFileIndexEntry);
}
entries = entryList.toArray(new Entry[entryList.size()]);
Arrays.sort(entries);
} else {
cleanupState();
}
}
private int readEntry(
int pos, List<Entry> entryList, Map<RelativeDirectory, DirectoryEntry> directories)
throws IOException {
if (get4ByteLittleEndian(zipDir, pos) != 0x02014b50) {
throw new ZipException("cannot read zip file entry");
}
int dirStart = pos + 46;
int fileStart = dirStart;
int fileEnd = fileStart + get2ByteLittleEndian(zipDir, pos + 28);
if (zipFileIndex.symbolFilePrefixLength != 0
&& ((fileEnd - fileStart) >= symbolFilePrefixLength)) {
dirStart += zipFileIndex.symbolFilePrefixLength;
fileStart += zipFileIndex.symbolFilePrefixLength;
}
// Force any '\' to '/'. Keep the position of the last separator.
for (int index = fileStart; index < fileEnd; index++) {
byte nextByte = zipDir[index];
if (nextByte == (byte) '\\') {
zipDir[index] = (byte) '/';
fileStart = index + 1;
} else if (nextByte == (byte) '/') {
fileStart = index + 1;
}
}
RelativeDirectory directory = null;
if (fileStart == dirStart) directory = getRelativeDirectory("");
else if (lastDir != null && lastLen == fileStart - dirStart - 1) {
int index = lastLen - 1;
while (zipDir[lastStart + index] == zipDir[dirStart + index]) {
if (index == 0) {
directory = lastDir;
break;
}
index--;
}
}
// Sub directories
if (directory == null) {
lastStart = dirStart;
lastLen = fileStart - dirStart - 1;
directory = getRelativeDirectory(new String(zipDir, dirStart, lastLen, "UTF-8"));
lastDir = directory;
// Enter also all the parent directories
RelativeDirectory tempDirectory = directory;
while (directories.get(tempDirectory) == null) {
directories.put(tempDirectory, new DirectoryEntry(tempDirectory, zipFileIndex));
if (tempDirectory.path.indexOf("/") == tempDirectory.path.length() - 1) break;
else {
// use shared RelativeDirectory objects for parent dirs
tempDirectory = getRelativeDirectory(tempDirectory.dirname().getPath());
}
}
} else {
if (directories.get(directory) == null) {
directories.put(directory, new DirectoryEntry(directory, zipFileIndex));
}
}
// For each dir create also a file
if (fileStart != fileEnd) {
Entry entry =
new Entry(directory, new String(zipDir, fileStart, fileEnd - fileStart, "UTF-8"));
entry.setNativeTime(get4ByteLittleEndian(zipDir, pos + 12));
entry.compressedSize = get4ByteLittleEndian(zipDir, pos + 20);
entry.size = get4ByteLittleEndian(zipDir, pos + 24);
entry.offset = get4ByteLittleEndian(zipDir, pos + 42);
entryList.add(entry);
}
return pos
+ 46
+ get2ByteLittleEndian(zipDir, pos + 28)
+ get2ByteLittleEndian(zipDir, pos + 30)
+ get2ByteLittleEndian(zipDir, pos + 32);
}