/**
* Get the next record 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. 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 header in the archive, or null.
* @throws IOException on error
*/
private byte[] getRecord() throws IOException {
if (hasHitEOF) {
return null;
}
byte[] headerBuf = buffer.readRecord();
if (headerBuf == null) {
hasHitEOF = true;
} else if (buffer.isEOFRecord(headerBuf)) {
hasHitEOF = true;
}
return hasHitEOF ? null : headerBuf;
}
/**
* Get the record size being used by this stream's TarBuffer.
*
* @return The TarBuffer record size.
*/
public int getRecordSize() {
return buffer.getRecordSize();
}
/**
* Closes this stream. Calls the TarBuffer's close() method.
*
* @throws IOException on error
*/
public void close() throws IOException {
buffer.close();
}
/**
* Reads bytes from the current tar archive entry.
*
* <p>This method is aware of the boundaries of the current entry in the archive and will deal
* with them as if they were this stream's start and EOF.
*
* @param buf The buffer into which to place bytes read.
* @param offset The offset at which to place bytes read.
* @param numToRead The number of bytes to read.
* @return The number of bytes read, or -1 at EOF.
* @throws IOException on error
*/
public int read(byte[] buf, int offset, int numToRead) throws IOException {
int totalRead = 0;
if (entryOffset >= entrySize) {
return -1;
}
if ((numToRead + entryOffset) > entrySize) {
numToRead = (int) (entrySize - entryOffset);
}
if (readBuf != null) {
int sz = (numToRead > readBuf.length) ? readBuf.length : numToRead;
System.arraycopy(readBuf, 0, buf, offset, sz);
if (sz >= readBuf.length) {
readBuf = null;
} else {
int newLen = readBuf.length - sz;
byte[] newBuf = new byte[newLen];
System.arraycopy(readBuf, sz, newBuf, 0, newLen);
readBuf = newBuf;
}
totalRead += sz;
numToRead -= sz;
offset += sz;
}
while (numToRead > 0) {
byte[] rec = buffer.readRecord();
if (rec == null) {
// Unexpected EOF!
throw new IOException(
"unexpected EOF with "
+ numToRead
+ " bytes unread. Occured at byte: "
+ getBytesRead());
}
count(rec.length);
int sz = numToRead;
int recLen = rec.length;
if (recLen > sz) {
System.arraycopy(rec, 0, buf, offset, sz);
readBuf = new byte[recLen - sz];
System.arraycopy(rec, sz, readBuf, 0, recLen - sz);
} else {
sz = recLen;
System.arraycopy(rec, 0, buf, offset, recLen);
}
totalRead += sz;
numToRead -= sz;
offset += sz;
}
entryOffset += totalRead;
return totalRead;
}
