private int bufferedRead(ByteList dst, int number) throws IOException, BadDescriptorException {
int bytesRead = 0;
//
// Copy what is in the buffer, if there is some buffered data
//
bytesRead += copyBufferedBytes(dst, number);
boolean done = false;
//
// Avoid double-copying for reads that are larger than the buffer size
//
while ((number - bytesRead) >= BUFSIZE) {
//
// limit each iteration to a max of BULK_READ_SIZE to avoid over-size allocations
//
final int bytesToRead = Math.min(BULK_READ_SIZE, number - bytesRead);
final int n = descriptor.read(bytesToRead, dst);
if (n == -1) {
eof = true;
done = true;
break;
} else if (n == 0) {
done = true;
break;
}
bytesRead += n;
}
//
// Complete the request by filling the read buffer first
//
while (!done && bytesRead < number) {
int read = refillBuffer();
if (read == -1) {
eof = true;
break;
} else if (read == 0) {
break;
}
// append what we read into our buffer and allow the loop to continue
final int len = Math.min(buffer.remaining(), number - bytesRead);
dst.append(buffer, len);
bytesRead += len;
}
if (bytesRead == 0 && number != 0) {
if (eof) {
throw newEOFException();
}
}
return bytesRead;
}
public synchronized ByteList read(int number) throws IOException, BadDescriptorException {
checkReadable();
ensureReadNonBuffered();
ByteList byteList = new ByteList(number);
// TODO this should entry into error handling somewhere
int bytesRead = descriptor.read(number, byteList);
if (bytesRead == -1) {
eof = true;
}
return byteList;
}
private int bufferedRead(ByteBuffer dst, boolean partial)
throws IOException, BadDescriptorException {
checkReadable();
ensureRead();
boolean done = false;
int bytesRead = 0;
//
// Copy what is in the buffer, if there is some buffered data
//
bytesRead += copyBufferedBytes(dst);
//
// Avoid double-copying for reads that are larger than the buffer size, or
// the destination is a direct buffer.
//
while ((bytesRead < 1 || !partial) && (dst.remaining() >= BUFSIZE || dst.isDirect())) {
ByteBuffer tmpDst = dst;
if (!dst.isDirect()) {
//
// We limit reads to BULK_READ_SIZED chunks to avoid NIO allocating
// a huge temporary native buffer, when doing reads into a heap buffer
// If the dst buffer is direct, then no need to limit.
//
int bytesToRead = Math.min(BULK_READ_SIZE, dst.remaining());
if (bytesToRead < dst.remaining()) {
tmpDst = dst.duplicate();
tmpDst.limit(tmpDst.position() + bytesToRead);
}
}
int n = descriptor.read(tmpDst);
if (n == -1) {
eof = true;
done = true;
break;
} else if (n == 0) {
done = true;
break;
} else {
bytesRead += n;
}
}
//
// Complete the request by filling the read buffer first
//
while (!done && dst.hasRemaining() && (bytesRead < 1 || !partial)) {
int read = refillBuffer();
if (read == -1) {
eof = true;
done = true;
break;
} else if (read == 0) {
done = true;
break;
} else {
// append what we read into our buffer and allow the loop to continue
bytesRead += copyBufferedBytes(dst);
}
}
if (eof && bytesRead == 0 && dst.remaining() != 0) {
throw newEOFException();
}
return bytesRead;
}