/*
***** BEGIN LICENSE BLOCK *****
* Version: CPL 1.0/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Common Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.eclipse.org/legal/cpl-v10.html
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* Copyright (C) 2004 Anders Bengtsson <ndrsbngtssn@yahoo.se>
* Copyright (C) 2004-2005 Thomas E Enebo <enebo@acm.org>
* Copyright (C) 2004 Jan Arne Petersen <jpetersen@uni-bonn.de>
* Copyright (C) 2004 Stefan Matthias Aust <sma@3plus4.de>
* Copyright (C) 2005 Charles O Nutter <headius@headius.com>
* Copyright (C) 2007 Damian Steer <pldms@mac.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the CPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the CPL, the GPL or the LGPL.
***** END LICENSE BLOCK *****/
package org.jruby.util.io;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.EOFException;
import java.io.FileDescriptor;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.FileChannel;
import java.nio.channels.Channel;
import java.nio.channels.IllegalBlockingModeException;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.SelectableChannel;
import java.nio.channels.WritableByteChannel;
import static java.util.logging.Logger.getLogger;
import org.jruby.Finalizable;
import org.jruby.Ruby;
import org.jruby.util.ByteList;
import org.jruby.util.JRubyFile;
/**
* <p>This file implements a seekable IO file.</p>
*/
public class ChannelStream implements Stream, Finalizable {
private final static boolean DEBUG = false;
/**
* The size of the read/write buffer allocated for this stream.
*
* This size has been scaled back from its original 16k because although
* the larger buffer size results in raw File.open times being rather slow
* (due to the cost of instantiating a relatively large buffer). We should
* try to find a happy medium, or potentially pool buffers, or perhaps even
* choose a value based on platform(??), but for now I am reducing it along
* with changes for the "large read" patch from JRUBY-2657.
*/
private final static int BUFSIZE = 4 * 1024;
/**
* The size at which a single read should turn into a chunkier bulk read.
* Currently, this size is about 4x a normal buffer size.
*
* This size was not really arrived at experimentally, and could potentially
* be increased. However, it seems like a "good size" and we should
* probably only adjust it if it turns out we would perform better with a
* larger buffer for large bulk reads.
*/
private final static int BULK_READ_SIZE = 16 * 1024;
private final static ByteBuffer EMPTY_BUFFER = ByteBuffer.allocate(0);
private Ruby runtime;
protected ModeFlags modes;
protected boolean sync = false;
protected volatile ByteBuffer buffer; // r/w buffer
protected boolean reading; // are we reading or writing?
private ChannelDescriptor descriptor;
private boolean blocking = true;
protected int ungotc = -1;
private volatile boolean closedExplicitly = false;
public ChannelStream(Ruby runtime, ChannelDescriptor descriptor, ModeFlags modes, FileDescriptor fileDescriptor) throws InvalidValueException {
descriptor.checkNewModes(modes);
this.runtime = runtime;
this.descriptor = descriptor;
this.modes = modes;
this.buffer = ByteBuffer.allocate(BUFSIZE);
buffer.flip();
this.reading = true;
// this constructor is used by fdopen, so we don't increment descriptor ref count
}
public ChannelStream(Ruby runtime, ChannelDescriptor descriptor) {
this(runtime, descriptor, descriptor.getFileDescriptor());
}
public ChannelStream(Ruby runtime, ChannelDescriptor descriptor, FileDescriptor fileDescriptor) {
this.runtime = runtime;
this.descriptor = descriptor;
this.modes = descriptor.getOriginalModes();
buffer = ByteBuffer.allocate(BUFSIZE);
buffer.flip();
this.reading = true;
}
public ChannelStream(Ruby runtime, ChannelDescriptor descriptor, ModeFlags modes) throws InvalidValueException {
descriptor.checkNewModes(modes);
this.runtime = runtime;
this.descriptor = descriptor;
this.modes = modes;
buffer = ByteBuffer.allocate(BUFSIZE);
buffer.flip();
this.reading = true;
}
public Ruby getRuntime() {
return runtime;
}
public void checkReadable() throws IOException {
if (!modes.isReadable()) throw new IOException("not opened for reading");
}
public void checkWritable() throws IOException {
if (!modes.isWritable()) throw new IOException("not opened for writing");
}
public void checkPermissionsSubsetOf(ModeFlags subsetModes) {
subsetModes.isSubsetOf(modes);
}
public ModeFlags getModes() {
return modes;
}
public boolean isSync() {
return sync;
}
public void setSync(boolean sync) {
this.sync = sync;
}
/**
* Implement IO#wait as per io/wait in MRI.
* waits until input available or timed out and returns self, or nil when EOF reached.
*
* The default implementation loops while ready returns 0.
*/
public void waitUntilReady() throws IOException, InterruptedException {
while (ready() == 0) {
Thread.sleep(10);
}
}
public boolean readDataBuffered() {
return reading && buffer.hasRemaining();
}
public boolean writeDataBuffered() {
return !reading && buffer.position() > 0;
}
private final int refillBuffer() throws IOException {
buffer.clear();
int n = ((ReadableByteChannel) descriptor.getChannel()).read(buffer);
buffer.flip();
return n;
}
public synchronized ByteList fgets(ByteList separatorString) throws IOException, BadDescriptorException {
checkReadable();
ensureRead();
if (separatorString == null) {
return readall();
}
final ByteList separator = (separatorString == PARAGRAPH_DELIMETER) ?
PARAGRAPH_SEPARATOR : separatorString;
descriptor.checkOpen();
if (feof()) {
return null;
}
int c = read();
if (c == -1) {
return null;
}
// unread back
buffer.position(buffer.position() - 1);
ByteList buf = new ByteList(40);
byte first = separator.bytes[separator.begin];
LineLoop : while (true) {
ReadLoop: while (true) {
byte[] bytes = buffer.array();
int offset = buffer.position();
int max = buffer.limit();
// iterate over remainder of buffer until we find a match
for (int i = offset; i < max; i++) {
c = bytes[i];
if (c == first) {
// terminate and advance buffer when we find our char
buf.append(bytes, offset, i - offset);
if (i >= max) {
buffer.clear();
} else {
buffer.position(i + 1);
}
break ReadLoop;
}
}
// no match, append remainder of buffer and continue with next block
buf.append(bytes, offset, buffer.remaining());
int read = refillBuffer();
if (read == -1) break LineLoop;
}
// found a match above, check if remaining separator characters match, appending as we go
for (int i = 0; i < separator.realSize; i++) {
if (c == -1) {
break LineLoop;
} else if (c != separator.bytes[separator.begin + i]) {
buf.append(c);
continue LineLoop;
}
buf.append(c);
if (i < separator.realSize - 1) {
c = read();
}
}
break;
}
if (separatorString == PARAGRAPH_DELIMETER) {
while (c == separator.bytes[separator.begin]) {
c = read();
}
ungetc(c);
}
return buf;
}
/**
* An version of read that reads all bytes up to and including a terminator byte.
* <p>
* If the terminator byte is found, it will be the last byte in the output buffer.
* </p>
*
* @param dst The output buffer.
* @param terminator The byte to terminate reading.
* @return The number of bytes read, or -1 if EOF is reached.
*
* @throws java.io.IOException
* @throws org.jruby.util.io.BadDescriptorException
*/
public synchronized int getline(ByteList dst, byte terminator) throws IOException, BadDescriptorException {
checkReadable();
ensureRead();
descriptor.checkOpen();
int totalRead = 0;
boolean found = false;
if (ungotc != -1) {
dst.append((byte) ungotc);
found = ungotc == terminator;
ungotc = -1;
++totalRead;
}
while (!found) {
final byte[] bytes = buffer.array();
final int begin = buffer.arrayOffset() + buffer.position();
final int end = begin + buffer.remaining();
int len = 0;
for (int i = begin; i < end && !found; ++i) {
found = bytes[i] == terminator;
++len;
}
if (len > 0) {
dst.append(buffer, len);
totalRead += len;
}
if (!found) {
int n = refillBuffer();
if (n <= 0) {
if (n < 0 && totalRead < 1) {
return -1;
}
break;
}
}
}
return totalRead;
}
public synchronized ByteList readall() throws IOException, BadDescriptorException {
if (descriptor.isSeekable()) {
invalidateBuffer();
FileChannel channel = (FileChannel)descriptor.getChannel();
long left = channel.size() - channel.position();
if (left <= 0) {
eof = true;
return null;
}
left += ungotc != -1 ? 1 : 0;
ByteList result = new ByteList((int) left);
ByteBuffer buf = ByteBuffer.wrap(result.unsafeBytes(),
result.begin(), (int) left);
if (ungotc != -1) {
buf.put((byte) ungotc);
ungotc = -1;
}
while (buf.hasRemaining()) {
int n = ((ReadableByteChannel) descriptor.getChannel()).read(buf);
if (n <= 0) {
break;
}
}
eof = true;
result.length(buf.position());
return result;
} else if (descriptor.isNull()) {
return new ByteList(0);
} else {
checkReadable();
ByteList byteList = new ByteList();
ByteList read = fread(BUFSIZE);
if (read == null) {
eof = true;
return byteList;
}
while (read != null) {
byteList.append(read);
read = fread(BUFSIZE);
}
return byteList;
}
}
/**
* <p>Close IO handler resources.</p>
* @throws IOException
* @throws BadDescriptorException
*
* @see org.jruby.util.IOHandler#close()
*/
public synchronized void fclose() throws IOException, BadDescriptorException {
closedExplicitly = true;
close(false); // not closing from finalize
}
/**
* Internal close, to safely work for finalizing.
* @param finalizing true if this is in a finalizing context
* @throws IOException
* @throws BadDescriptorException
*/
private void close(boolean finalizing) throws IOException, BadDescriptorException {
try {
flushWrite();
descriptor.close();
buffer = EMPTY_BUFFER;
if (DEBUG) getLogger("ChannelStream").info("Descriptor for fileno "
+ descriptor.getFileno() + " closed by stream");
} finally {
if (!finalizing) getRuntime().removeInternalFinalizer(this);
}
}
/**
* Internal close, to safely work for finalizing.
* @param finalizing true if this is in a finalizing context
* @throws IOException
* @throws BadDescriptorException
*/
private void closeForFinalize() {
try {
close(true);
} catch (BadDescriptorException ex) {
// silence
} catch (IOException ex) {
// silence
}
}
/**
* @throws IOException
* @throws BadDescriptorException
* @see org.jruby.util.IOHandler#flush()
*/
public synchronized int fflush() throws IOException, BadDescriptorException {
checkWritable();
try {
flushWrite();
} catch (EOFException eof) {
return -1;
}
return 0;
}
/**
* Flush the write buffer to the channel (if needed)
* @throws IOException
*/
private void flushWrite() throws IOException, BadDescriptorException {
if (reading || !modes.isWritable() || buffer.position() == 0) return; // Don't bother
int len = buffer.position();
buffer.flip();
int n = descriptor.write(buffer);
if(n != len) {
// TODO: check the return value here
}
buffer.clear();
}
/**
* Flush the write buffer to the channel (if needed)
* @throws IOException
*/
private boolean flushWrite(final boolean block) throws IOException, BadDescriptorException {
if (reading || !modes.isWritable() || buffer.position() == 0) return false; // Don't bother
int len = buffer.position();
int nWritten = 0;
buffer.flip();
// For Sockets, only write as much as will fit.
if (descriptor.getChannel() instanceof SelectableChannel) {
SelectableChannel selectableChannel = (SelectableChannel)descriptor.getChannel();
synchronized (selectableChannel.blockingLock()) {
boolean oldBlocking = selectableChannel.isBlocking();
try {
if (oldBlocking != block) {
selectableChannel.configureBlocking(block);
}
nWritten = descriptor.write(buffer);
} finally {
if (oldBlocking != block) {
selectableChannel.configureBlocking(oldBlocking);
}
}
}
} else {
nWritten = descriptor.write(buffer);
}
if (nWritten != len) {
buffer.compact();
return false;
}
buffer.clear();
return true;
}
/**
* @see org.jruby.util.IOHandler#getInputStream()
*/
public InputStream newInputStream() {
InputStream in = descriptor.getBaseInputStream();
if (in == null) {
return new BufferedInputStream(Channels.newInputStream((ReadableByteChannel)descriptor.getChannel()));
} else {
return in;
}
}
/**
* @see org.jruby.util.IOHandler#getOutputStream()
*/
public OutputStream newOutputStream() {
return new BufferedOutputStream(Channels.newOutputStream((WritableByteChannel)descriptor.getChannel()));
}
private boolean eof = false;
public void clearerr() {
eof = false;
}
/**
* @throws IOException
* @throws BadDescriptorException
* @see org.jruby.util.IOHandler#isEOF()
*/
public synchronized boolean feof() throws IOException, BadDescriptorException {
checkReadable();
if (eof) {
return true;
} else {
return false;
}
//
// if (reading && buffer.hasRemaining()) return false;
//
// if (descriptor.isSeekable()) {
// FileChannel fileChannel = (FileChannel)descriptor.getChannel();
// return (fileChannel.size() == fileChannel.position());
// } else if (descriptor.getChannel() instanceof SocketChannel) {
// return false;
// } else {
// checkReadable();
// ensureRead();
//
// if (ungotc > 0) {
// return false;
// }
// // TODO: this is new to replace what's below
// ungotc = read();
// if (ungotc == -1) {
// eof = true;
// return true;
// }
// // FIXME: this was here before; need a better way?
//// if (fillInBuffer() < 0) {
//// return true;
//// }
// return false;
// }
}
/**
* @throws IOException
* @see org.jruby.util.IOHandler#pos()
*/
public synchronized long fgetpos() throws IOException, PipeException, InvalidValueException, BadDescriptorException {
// Correct position for read / write buffering (we could invalidate, but expensive)
if (descriptor.isSeekable()) {
FileChannel fileChannel = (FileChannel)descriptor.getChannel();
long pos = fileChannel.position();
// Adjust for buffered data
if (reading) {
pos -= buffer.remaining();
return pos - (pos > 0 && ungotc != -1 ? 1 : 0);
} else {
return pos + buffer.position();
}
} else if (descriptor.isNull()) {
return 0;
} else {
throw new PipeException();
}
}
/**
* Implementation of libc "lseek", which seeks on seekable streams, raises
* EPIPE if the fd is assocated with a pipe, socket, or FIFO, and doesn't
* do anything for other cases (like stdio).
*
* @throws IOException
* @throws InvalidValueException
* @see org.jruby.util.IOHandler#seek(long, int)
*/
public synchronized void lseek(long offset, int type) throws IOException, InvalidValueException, PipeException, BadDescriptorException {
if (descriptor.isSeekable()) {
FileChannel fileChannel = (FileChannel)descriptor.getChannel();
ungotc = -1;
int adj = 0;
if (reading) {
// for SEEK_CUR, need to adjust for buffered data
adj = buffer.remaining();
buffer.clear();
buffer.flip();
} else {
flushWrite();
}
try {
switch (type) {
case SEEK_SET:
fileChannel.position(offset);
break;
case SEEK_CUR:
fileChannel.position(fileChannel.position() - adj + offset);
break;
case SEEK_END:
fileChannel.position(fileChannel.size() + offset);
break;
}
} catch (IllegalArgumentException e) {
throw new InvalidValueException();
} catch (IOException ioe) {
ioe.printStackTrace();
throw ioe;
}
} else if (descriptor.getChannel() instanceof SelectableChannel) {
// TODO: It's perhaps just a coincidence that all the channels for
// which we should raise are instanceof SelectableChannel, since
// stdio is not...so this bothers me slightly. -CON
throw new PipeException();
} else {
}
}
/**
* @see org.jruby.util.IOHandler#sync()
*/
public void sync() throws IOException, BadDescriptorException {
flushWrite();
}
/**
* Ensure buffer is ready for reading, flushing remaining writes if required
* @throws IOException
*/
private void ensureRead() throws IOException, BadDescriptorException {
if (reading) return;
flushWrite();
buffer.clear();
buffer.flip();
reading = true;
}
/**
* Ensure buffer is ready for reading, flushing remaining writes if required
* @throws IOException
*/
private void ensureReadNonBuffered() throws IOException, BadDescriptorException {
if (reading) {
if (buffer.hasRemaining()) {
throw getRuntime().newIOError("sysread for buffered IO");
}
} else {
// libc flushes writes on any read from the actual file, so we flush here
flushWrite();
buffer.clear();
buffer.flip();
reading = true;
}
}
private void resetForWrite() throws IOException {
if (descriptor.isSeekable()) {
FileChannel fileChannel = (FileChannel)descriptor.getChannel();
if (buffer.hasRemaining()) { // we have read ahead, and need to back up
fileChannel.position(fileChannel.position() - buffer.remaining());
}
}
// FIXME: Clearing read buffer here...is this appropriate?
buffer.clear();
reading = false;
}
/**
* Ensure buffer is ready for writing.
* @throws IOException
*/
private void ensureWrite() throws IOException {
if (!reading) return;
resetForWrite();
}
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 ByteList bufferedRead(int number) throws IOException, BadDescriptorException {
checkReadable();
ensureRead();
ByteList result = new ByteList(0);
int len = -1;
if (buffer.hasRemaining()) { // already have some bytes buffered
len = (number <= buffer.remaining()) ? number : buffer.remaining();
result.append(buffer, len);
}
boolean done = false;
//
// Avoid double-copying for reads that are larger than the buffer size
//
while ((number - result.length()) >= BUFSIZE) {
//
// limit each iteration to a max of BULK_READ_SIZE to avoid over-size allocations
//
int bytesToRead = Math.min(BULK_READ_SIZE, number - result.length());
int n = descriptor.read(bytesToRead, result);
if (n == -1) {
eof = true;
done = true;
break;
} else if (n == 0) {
done = true;
break;
}
}
//
// Complete the request by filling the read buffer first
//
while (!done && result.length() != 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
int desired = number - result.length();
len = (desired < read) ? desired : read;
result.append(buffer, len);
}
if (result.length() == 0 && number != 0) {
if (eof) {
throw new EOFException();
}
}
return result;
}
private int bufferedRead() throws IOException, BadDescriptorException {
ensureRead();
if (!buffer.hasRemaining()) {
int len = refillBuffer();
if (len == -1) {
eof = true;
return -1;
} else if (len == 0) {
return -1;
}
}
return buffer.get() & 0xFF;
}
/**
* @throws IOException
* @throws BadDescriptorException
* @see org.jruby.util.IOHandler#syswrite(String buf)
*/
private int bufferedWrite(ByteList buf) throws IOException, BadDescriptorException {
getRuntime().secure(4);
checkWritable();
ensureWrite();
// Ruby ignores empty syswrites
if (buf == null || buf.length() == 0) return 0;
if (buf.length() > buffer.capacity()) { // Doesn't fit in buffer. Write immediately.
flushWrite(); // ensure nothing left to write
int n = descriptor.write(ByteBuffer.wrap(buf.unsafeBytes(), buf.begin(), buf.length()));
if(n != buf.length()) {
// TODO: check the return value here
}
} else {
if (buf.length() > buffer.remaining()) flushWrite();
buffer.put(buf.unsafeBytes(), buf.begin(), buf.length());
}
if (isSync()) sync();
return buf.realSize;
}
/**
* @throws IOException
* @throws BadDescriptorException
* @see org.jruby.util.IOHandler#syswrite(String buf)
*/
private int bufferedWrite(int c) throws IOException, BadDescriptorException {
getRuntime().secure(4);
checkWritable();
ensureWrite();
if (!buffer.hasRemaining()) flushWrite();
buffer.put((byte) c);
if (isSync()) sync();
return 1;
}
public synchronized void ftruncate(long newLength) throws IOException,
BadDescriptorException, InvalidValueException {
Channel ch = descriptor.getChannel();
if (!(ch instanceof FileChannel)) {
throw new InvalidValueException();
}
invalidateBuffer();
FileChannel fileChannel = (FileChannel)ch;
if (newLength > fileChannel.size()) {
// truncate can't lengthen files, so we save position, seek/write, and go back
long position = fileChannel.position();
int difference = (int)(newLength - fileChannel.size());
fileChannel.position(fileChannel.size());
// FIXME: This worries me a bit, since it could allocate a lot with a large newLength
fileChannel.write(ByteBuffer.allocate(difference));
fileChannel.position(position);
} else {
fileChannel.truncate(newLength);
}
}
/**
* Invalidate buffer before a position change has occurred (e.g. seek),
* flushing writes if required, and correcting file position if reading
* @throws IOException
*/
private void invalidateBuffer() throws IOException, BadDescriptorException {
if (!reading) flushWrite();
int posOverrun = buffer.remaining(); // how far ahead we are when reading
buffer.clear();
if (reading) {
buffer.flip();
// if the read buffer is ahead, back up
FileChannel fileChannel = (FileChannel)descriptor.getChannel();
if (posOverrun != 0) fileChannel.position(fileChannel.position() - posOverrun);
}
}
/**
* Ensure close (especially flush) when we're finished with
*/
@Override
public synchronized void finalize() {
if (closedExplicitly) return;
// FIXME: I got a bunch of NPEs when I didn't check for nulls here...HOW?!
if (descriptor != null && descriptor.isSeekable() && descriptor.isOpen()) {
closeForFinalize(); // close without removing from finalizers
}
}
public int ready() throws IOException {
return newInputStream().available();
}
public synchronized void fputc(int c) throws IOException, BadDescriptorException {
bufferedWrite(c);
}
public int ungetc(int c) {
if (c == -1) {
return -1;
}
// putting a bit back, so we're not at EOF anymore
eof = false;
// save the ungot
ungotc = c;
return c;
}
public synchronized int fgetc() throws IOException, BadDescriptorException {
if (eof) {
return -1;
}
checkReadable();
int c = read();
if (c == -1) {
eof = true;
return c;
}
return c & 0xff;
}
public synchronized int fwrite(ByteList string) throws IOException, BadDescriptorException {
return bufferedWrite(string);
}
public synchronized int writenonblock(ByteList buf) throws IOException, BadDescriptorException {
getRuntime().secure(4);
checkWritable();
ensureWrite();
// Ruby ignores empty syswrites
if (buf == null || buf.length() == 0) return 0;
if (buffer.position() != 0 && !flushWrite(false)) return 0;
if (descriptor.getChannel() instanceof SelectableChannel) {
SelectableChannel selectableChannel = (SelectableChannel)descriptor.getChannel();
synchronized (selectableChannel.blockingLock()) {
boolean oldBlocking = selectableChannel.isBlocking();
try {
if (oldBlocking) {
selectableChannel.configureBlocking(false);
}
return descriptor.write(ByteBuffer.wrap(buf.unsafeBytes(), buf.begin(), buf.length()));
} finally {
if (oldBlocking) {
selectableChannel.configureBlocking(oldBlocking);
}
}
}
} else {
return descriptor.write(ByteBuffer.wrap(buf.unsafeBytes(), buf.begin(), buf.length()));
}
}
public synchronized ByteList fread(int number) throws IOException, BadDescriptorException {
try {
if (number == 0) {
if (eof) {
return null;
} else {
return new ByteList(0);
}
}
if (ungotc >= 0) {
ByteList buf2 = bufferedRead(number - 1);
buf2.prepend((byte)ungotc);
ungotc = -1;
return buf2;
}
return bufferedRead(number);
} catch (EOFException e) {
eof = true;
return null;
}
}
public synchronized ByteList readnonblock(int number) throws IOException, BadDescriptorException, EOFException {
assert number >= 0;
if (number == 0) {
return null;
}
if (descriptor.getChannel() instanceof SelectableChannel) {
SelectableChannel selectableChannel = (SelectableChannel)descriptor.getChannel();
synchronized (selectableChannel.blockingLock()) {
boolean oldBlocking = selectableChannel.isBlocking();
try {
selectableChannel.configureBlocking(false);
return readpartial(number);
} finally {
selectableChannel.configureBlocking(oldBlocking);
}
}
} else if (descriptor.getChannel() instanceof FileChannel) {
return fread(number);
} else {
return null;
}
}
public synchronized ByteList readpartial(int number) throws IOException, BadDescriptorException, EOFException {
assert number >= 0;
if (number == 0) {
return null;
}
if (descriptor.getChannel() instanceof FileChannel) {
return fread(number);
}
// make sure that the ungotc is not forgotten
if (ungotc >= 0) {
number--;
if (number == 0 || !buffer.hasRemaining()) {
ByteList result = new ByteList(new byte[] {(byte)ungotc}, false);
ungotc = -1;
return result;
}
}
if (buffer.hasRemaining()) {
// already have some bytes buffered, just return those
ByteList result = bufferedRead(Math.min(buffer.remaining(), number));
if (ungotc >= 0) {
result.prepend((byte)ungotc);
ungotc = -1;
}
return result;
} else {
// otherwise, we try an unbuffered read to get whatever's available
return read(number);
}
}
public synchronized int read() throws IOException, BadDescriptorException {
try {
descriptor.checkOpen();
if (ungotc >= 0) {
int c = ungotc;
ungotc = -1;
return c;
}
return bufferedRead();
} catch (EOFException e) {
eof = true;
return -1;
}
}
public ChannelDescriptor getDescriptor() {
return descriptor;
}
public void setBlocking(boolean block) throws IOException {
if (!(descriptor.getChannel() instanceof SelectableChannel)) {
return;
}
synchronized (((SelectableChannel) descriptor.getChannel()).blockingLock()) {
blocking = block;
try {
((SelectableChannel) descriptor.getChannel()).configureBlocking(block);
} catch (IllegalBlockingModeException e) {
// ignore this; select() will set the correct mode when it is finished
}
}
}
public boolean isBlocking() {
return blocking;
}
public synchronized void freopen(String path, ModeFlags modes) throws DirectoryAsFileException, IOException, InvalidValueException, PipeException, BadDescriptorException {
// flush first
flushWrite();
// reset buffer
buffer.clear();
if (reading) {
buffer.flip();
}
this.modes = modes;
if (descriptor.isOpen()) {
descriptor.close();
}
if (path.equals("/dev/null") || path.equalsIgnoreCase("nul:") || path.equalsIgnoreCase("nul")) {
descriptor = new ChannelDescriptor(new NullChannel(), descriptor.getFileno(), modes, new FileDescriptor());
} else {
String cwd = getRuntime().getCurrentDirectory();
JRubyFile theFile = JRubyFile.create(cwd,path);
if (theFile.isDirectory() && modes.isWritable()) throw new DirectoryAsFileException();
if (modes.isCreate()) {
if (theFile.exists() && modes.isExclusive()) {
throw getRuntime().newErrnoEEXISTError("File exists - " + path);
}
theFile.createNewFile();
} else {
if (!theFile.exists()) {
throw getRuntime().newErrnoENOENTError("file not found - " + path);
}
}
// We always open this rw since we can only open it r or rw.
RandomAccessFile file = new RandomAccessFile(theFile, modes.toJavaModeString());
if (modes.isTruncate()) file.setLength(0L);
descriptor = new ChannelDescriptor(file.getChannel(), descriptor.getFileno(), modes, file.getFD());
if (modes.isAppendable()) lseek(0, SEEK_END);
}
}
public static Stream fopen(Ruby runtime, String path, ModeFlags modes) throws FileNotFoundException, DirectoryAsFileException, FileExistsException, IOException, InvalidValueException, PipeException, BadDescriptorException {
String cwd = runtime.getCurrentDirectory();
ChannelDescriptor descriptor = ChannelDescriptor.open(cwd, path, modes);
Stream stream = fdopen(runtime, descriptor, modes);
if (modes.isAppendable()) stream.lseek(0, Stream.SEEK_END);
return stream;
}
public static Stream fdopen(Ruby runtime, ChannelDescriptor descriptor, ModeFlags modes) throws InvalidValueException {
Stream handler = new ChannelStream(runtime, descriptor, modes, descriptor.getFileDescriptor());
return handler;
}
}