private void readDataDescr() throws IOException {
if (readLeInt() != EXTSIG) throw new ZipException("Data descriptor signature not found");
entry.setCrc(readLeInt() & 0xffffffffL);
csize = readLeInt();
size = readLeInt();
entry.setSize(size & 0xffffffffL);
entry.setCompressedSize(csize & 0xffffffffL);
}
/**
* Reads a block of bytes from the current zip entry.
*
* @return the number of bytes read (may be smaller, even before EOF), or -1 on EOF.
* @exception IOException if a i/o error occured.
* @exception ZipException if the deflated stream is corrupted.
*/
public int read(byte[] b, int off, int len) throws IOException {
if (len == 0) return 0;
if (crc == null) throw new IOException("Stream closed.");
if (entry == null) return -1;
boolean finished = false;
switch (method) {
case ZipOutputStream.DEFLATED:
len = super.read(b, off, len);
if (len < 0) {
if (!inf.finished()) throw new ZipException("Inflater not finished!?");
avail = inf.getRemaining();
if ((flags & 8) != 0) readDataDescr();
if (inf.getTotalIn() != csize || inf.getTotalOut() != size)
throw new ZipException(
"size mismatch: "
+ csize
+ ";"
+ size
+ " <-> "
+ inf.getTotalIn()
+ ";"
+ inf.getTotalOut());
inf.reset();
finished = true;
}
break;
case ZipOutputStream.STORED:
if (len > csize && csize >= 0) len = csize;
len = readBuf(b, off, len);
if (len > 0) {
csize -= len;
size -= len;
}
if (csize == 0) finished = true;
else if (len < 0) throw new ZipException("EOF in stored block");
break;
}
if (len > 0) crc.update(b, off, len);
if (finished) {
if ((crc.getValue() & 0xffffffffL) != entry.getCrc()) throw new ZipException("CRC mismatch");
crc.reset();
entry = null;
entryAtEOF = true;
}
return len;
}
/**
* Open the next entry from the zip archive, and return its description. If the previous entry
* wasn't closed, this method will close it.
*/
public ZipEntry getNextEntry() throws IOException {
if (crc == null) throw new IOException("Stream closed.");
if (entry != null) closeEntry();
int header = readLeInt();
if (header == CENSIG) {
/* Central Header reached. */
close();
return null;
}
if (header != LOCSIG)
throw new ZipException("Wrong Local header signature: " + Integer.toHexString(header));
/* skip version */
readLeShort();
flags = readLeShort();
method = readLeShort();
int dostime = readLeInt();
int crc = readLeInt();
csize = readLeInt();
size = readLeInt();
int nameLen = readLeShort();
int extraLen = readLeShort();
if (method == ZipOutputStream.STORED && csize != size)
throw new ZipException("Stored, but compressed != uncompressed");
byte[] buffer = new byte[nameLen];
readFully(buffer);
String name;
try {
name = new String(buffer, "UTF-8");
} catch (UnsupportedEncodingException uee) {
throw new Error(uee.toString());
}
entry = createZipEntry(name);
entryAtEOF = false;
entry.setMethod(method);
if ((flags & 8) == 0) {
entry.setCrc(crc & 0xffffffffL);
entry.setSize(size & 0xffffffffL);
entry.setCompressedSize(csize & 0xffffffffL);
}
entry.setDOSTime(dostime);
if (extraLen > 0) {
byte[] extra = new byte[extraLen];
readFully(extra);
entry.setExtra(extra);
}
if (method == ZipOutputStream.DEFLATED && avail > 0) {
System.arraycopy(buf, len - avail, buf, 0, avail);
len = avail;
avail = 0;
inf.setInput(buf, 0, len);
}
return entry;
}
