/**
* Searches for the "End of central dir record", parses
* it and positions the stream at the first central directory
* record.
*/
private void positionAtCentralDirectory()
//throws IOException
{
bool found = false;
long off = archive.length() - MIN_EOCD_SIZE;
long stopSearching = java.lang.Math.max(0L, archive.length() - MAX_EOCD_SIZE);
if (off >= 0)
{
archive.seek(off);
byte[] sig = ZipArchiveOutputStream.EOCD_SIG;
int curr = archive.read();
while (off >= stopSearching && curr != -1)
{
if (curr == sig[POS_0])
{
curr = archive.read();
if (curr == sig[POS_1])
{
curr = archive.read();
if (curr == sig[POS_2])
{
curr = archive.read();
if (curr == sig[POS_3])
{
found = true;
break;
}
}
}
}
archive.seek(--off);
curr = archive.read();
}
}
if (!found)
{
throw new java.util.zip.ZipException("archive is not a ZIP archive");
}
archive.seek(off + CFD_LOCATOR_OFFSET);
byte[] cfdOffset = new byte[WORD];
archive.readFully(cfdOffset);
archive.seek(ZipLong.getValue(cfdOffset));
}
/** {@inheritDoc} */
public void parseFromLocalFileData(byte[] buffer, int offset, int length)
//throws ZipException
{
if (length < 5)
{
throw new java.util.zip.ZipException("UniCode path extra data must have at least 5 bytes.");
}
int version = buffer[offset];
if (version != 0x01)
{
throw new java.util.zip.ZipException("Unsupported version [" + version
+ "] for UniCode path extra data.");
}
nameCRC32 = ZipLong.getValue(buffer, offset + 1);
unicodeName = new byte[length - 5];
java.lang.SystemJ.arraycopy(buffer, offset + 5, unicodeName, 0, length - 5);
data = null;
}
/**
* Populate data from this array as if it was in local file data.
* @param data an array of bytes
* @param offset the start offset
* @param length the number of bytes in the array from offset
* @throws ZipException on error
*/
public void parseFromLocalFileData(byte[] data, int offset, int length)
//throws ZipException
{
long givenChecksum = ZipLong.getValue(data, offset);
byte[] tmp = new byte[length - WORD];
java.lang.SystemJ.arraycopy(data, offset + WORD, tmp, 0, length - WORD);
crc.reset();
crc.update(tmp);
long realChecksum = crc.getValue();
if (givenChecksum != realChecksum)
{
throw new java.util.zip.ZipException("bad CRC checksum "
+ java.lang.Long.toHexString(givenChecksum)
+ " instead of "
+ java.lang.Long.toHexString(realChecksum));
}
int newMode = ZipShort.getValue(tmp, 0);
// CheckStyle:MagicNumber OFF
byte[] linkArray = new byte[(int)ZipLong.getValue(tmp, 2)];
uid = ZipShort.getValue(tmp, 6);
gid = ZipShort.getValue(tmp, 8);
if (linkArray.Length == 0)
{
link = "";
}
else
{
java.lang.SystemJ.arraycopy(tmp, 10, linkArray, 0, linkArray.Length);
link = System.Text.ASCIIEncoding.ASCII.GetString(linkArray); // Uses default charset - see class Javadoc
}
// CheckStyle:MagicNumber ON
setDirectory((newMode & UnixStat.DIR_FLAG) != 0);
setMode(newMode);
}
/**
* Reads the central directory of the given archive and populates
* the internal tables with ZipArchiveEntry instances.
*
* <p>The ZipArchiveEntrys will know all data that can be obtained from
* the central directory alone, but not the data that requires the
* local file header or additional data to be read.</p>
*
* @return a Map<ZipArchiveEntry, NameAndComment>> of
* zipentries that didn't have the language encoding flag set when
* read.
*/
private java.util.Map <ZipArchiveEntry, IAC_NameAndComment> populateFromCentralDirectory()
//throws IOException
{
java.util.HashMap <ZipArchiveEntry, IAC_NameAndComment> noUTF8Flag = new java.util.HashMap <ZipArchiveEntry, IAC_NameAndComment>();
positionAtCentralDirectory();
byte[] cfh = new byte[CFH_LEN];
byte[] signatureBytes = new byte[WORD];
archive.readFully(signatureBytes);
long sig = ZipLong.getValue(signatureBytes);
long cfhSig = ZipLong.getValue(ZipArchiveOutputStream.CFH_SIG);
if (sig != cfhSig && startsWithLocalFileHeader())
{
throw new java.io.IOException("central directory is empty, can't expand"
+ " corrupt archive.");
}
while (sig == cfhSig)
{
archive.readFully(cfh);
int off = 0;
ZipArchiveEntry ze = new ZipArchiveEntry();
int versionMadeBy = ZipShort.getValue(cfh, off);
off += SHORT;
ze.setPlatform((versionMadeBy >> BYTE_SHIFT) & NIBLET_MASK);
off += SHORT; // skip version info
GeneralPurposeBit gpFlag = GeneralPurposeBit.parse(cfh, off);
bool hasUTF8Flag = gpFlag.usesUTF8ForNames();
ZipEncoding entryEncoding =
hasUTF8Flag ? ZipEncodingHelper.UTF8_ZIP_ENCODING : zipEncoding;
ze.setGeneralPurposeBit(gpFlag);
off += SHORT;
ze.setMethod(ZipShort.getValue(cfh, off));
off += SHORT;
// FIXME this is actually not very cpu cycles friendly as we are converting from
// dos to java while the underlying Sun implementation will convert
// from java to dos time for internal storage...
long time = ZipUtil.dosToJavaTime(ZipLong.getValue(cfh, off));
ze.setTime(time);
off += WORD;
ze.setCrc(ZipLong.getValue(cfh, off));
off += WORD;
ze.setCompressedSize(ZipLong.getValue(cfh, off));
off += WORD;
ze.setSize(ZipLong.getValue(cfh, off));
off += WORD;
int fileNameLen = ZipShort.getValue(cfh, off);
off += SHORT;
int extraLen = ZipShort.getValue(cfh, off);
off += SHORT;
int commentLen = ZipShort.getValue(cfh, off);
off += SHORT;
off += SHORT; // disk number
ze.setInternalAttributes(ZipShort.getValue(cfh, off));
off += SHORT;
ze.setExternalAttributes(ZipLong.getValue(cfh, off));
off += WORD;
byte[] fileName = new byte[fileNameLen];
archive.readFully(fileName);
ze.setName(entryEncoding.decode(fileName));
// LFH offset,
IAC_OffsetEntry offset = new IAC_OffsetEntry();
offset.headerOffset = ZipLong.getValue(cfh, off);
// data offset will be filled later
entries.put(ze, offset);
nameMap.put(ze.getName(), ze);
byte[] cdExtraData = new byte[extraLen];
archive.readFully(cdExtraData);
ze.setCentralDirectoryExtra(cdExtraData);
byte[] comment = new byte[commentLen];
archive.readFully(comment);
ze.setComment(entryEncoding.decode(comment));
archive.readFully(signatureBytes);
sig = ZipLong.getValue(signatureBytes);
if (!hasUTF8Flag && useUnicodeExtraFields)
{
noUTF8Flag.put(ze, new IAC_NameAndComment(fileName, comment));
}
}
return(noUTF8Flag);
}
public ZipArchiveEntry getNextZipEntry() //throws IOException
{
if (closed || hitCentralDirectory)
{
return(null);
}
if (current != null)
{
closeEntry();
}
byte[] lfh = new byte[LFH_LEN];
try {
readFully(lfh);
} catch (java.io.EOFException) {
return(null);
}
ZipLong sig = new ZipLong(lfh);
if (sig.equals(ZipLong.CFH_SIG))
{
hitCentralDirectory = true;
return(null);
}
if (!sig.equals(ZipLong.LFH_SIG))
{
return(null);
}
int off = WORD;
current = new ZipArchiveEntry();
int versionMadeBy = ZipShort.getValue(lfh, off);
off += SHORT;
current.setPlatform((versionMadeBy >> ZipFile.BYTE_SHIFT)
& ZipFile.NIBLET_MASK);
GeneralPurposeBit gpFlag = GeneralPurposeBit.parse(lfh, off);
bool hasUTF8Flag = gpFlag.usesUTF8ForNames();
ZipEncoding entryEncoding =
hasUTF8Flag ? ZipEncodingHelper.UTF8_ZIP_ENCODING : zipEncoding;
hasDataDescriptor = gpFlag.usesDataDescriptor();
current.setGeneralPurposeBit(gpFlag);
off += SHORT;
current.setMethod(ZipShort.getValue(lfh, off));
off += SHORT;
long time = ZipUtil.dosToJavaTime(ZipLong.getValue(lfh, off));
current.setTime(time);
off += WORD;
if (!hasDataDescriptor)
{
current.setCrc(ZipLong.getValue(lfh, off));
off += WORD;
current.setCompressedSize(ZipLong.getValue(lfh, off));
off += WORD;
current.setSize(ZipLong.getValue(lfh, off));
off += WORD;
}
else
{
off += 3 * WORD;
}
int fileNameLen = ZipShort.getValue(lfh, off);
off += SHORT;
int extraLen = ZipShort.getValue(lfh, off);
off += SHORT;
byte[] fileName = new byte[fileNameLen];
readFully(fileName);
current.setName(entryEncoding.decode(fileName));
byte[] extraData = new byte[extraLen];
readFully(extraData);
current.setExtra(extraData);
if (!hasUTF8Flag && useUnicodeExtraFields)
{
ZipUtil.setNameAndCommentFromExtraFields(current, fileName, null);
}
return(current);
}
/**
* Convert a DOS date/time field to a Date object.
*
* @param zipDosTime contains the stored DOS time.
* @return a Date instance corresponding to the given time.
*/
public static java.util.Date fromDosTime(ZipLong zipDosTime)
{
long dosTime = zipDosTime.getValue();
return(new java.util.Date(dosToJavaTime(dosTime)));
}
/**
* Create instance from the four bytes starting at offset.
* @param bytes the bytes to store as a ZipLong
* @param offset the offset to start
*/
public ZipLong(byte[] bytes, int offset)
{
value = ZipLong.getValue(bytes, offset);
}
/**
* Create instance from bytes.
* @param bytes the bytes to store as a ZipLong
*/
public ZipLong(byte[] bytes)
{
value = ZipLong.getValue(bytes, 0);
}