/**
* Whether this class is able to read the given entry.
*
* <p>May return false if the current entry is a sparse file.
*/
public boolean canReadEntryData(ArchiveEntry ae) {
if (ae instanceof TarArchiveEntry) {
TarArchiveEntry te = (TarArchiveEntry) ae;
return !te.isGNUSparse();
}
return false;
}
/**
* Get the next entry in this tar archive. This will skip over any remaining data in the current
* entry, if there is one, and place the input stream at the header of the next entry, and read
* the header and instantiate a new TarEntry from the header bytes and return that entry. If there
* are no more entries in the archive, null will be returned to indicate that the end of the
* archive has been reached.
*
* @return The next TarEntry in the archive, or null.
* @throws IOException on error
*/
public TarArchiveEntry getNextTarEntry() throws IOException {
if (hasHitEOF) {
return null;
}
if (currEntry != null) {
long numToSkip = entrySize - entryOffset;
while (numToSkip > 0) {
long skipped = skip(numToSkip);
if (skipped <= 0) {
throw new RuntimeException("failed to skip current tar entry");
}
numToSkip -= skipped;
}
readBuf = null;
}
byte[] headerBuf = getRecord();
if (hasHitEOF) {
currEntry = null;
return null;
}
currEntry = new TarArchiveEntry(headerBuf);
entryOffset = 0;
entrySize = currEntry.getSize();
if (currEntry.isGNULongNameEntry()) {
// read in the name
StringBuffer longName = new StringBuffer();
byte[] buf = new byte[SMALL_BUFFER_SIZE];
int length = 0;
while ((length = read(buf)) >= 0) {
longName.append(new String(buf, 0, length));
}
getNextEntry();
if (currEntry == null) {
// Bugzilla: 40334
// Malformed tar file - long entry name not followed by entry
return null;
}
// remove trailing null terminator
if (longName.length() > 0 && longName.charAt(longName.length() - 1) == 0) {
longName.deleteCharAt(longName.length() - 1);
}
currEntry.setName(longName.toString());
}
if (currEntry.isPaxHeader()) { // Process Pax headers
paxHeaders();
}
if (currEntry.isGNUSparse()) { // Process sparse files
readGNUSparse();
}
return currEntry;
}
