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/**
* Author: Sven Gothel <sgothel@jausoft.com>
* Copyright (c) 2022 Gothel Software e.K.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package org.jau.io;
import java.nio.ByteBuffer;
/**
* File based byte input stream, including named file descriptor.
*
* Implementation mimics std::ifstream via OS level file descriptor (FD) operations,
* giving more flexibility, allowing reusing existing FD and enabling openat() operations.
*
* If source path denotes a named file descriptor, i.e. jau::fs::file_stats::is_fd() returns true,
* has_content_size() returns false and available() returns true as long the stream is open and EOS hasn't occurred.
*
* Instance uses the native C++ object `jau::io::ByteInStream_File`.
*/
public final class ByteInStream_File implements ByteInStream {
private volatile long nativeInstance;
/* pp */ long getNativeInstance() { return nativeInstance; }
/**
* Construct a Stream-Based byte input stream from filesystem path
*
* In case the given path is a local file URI starting with `file://`, see {@link org.jau.io.UriTk#is_local_file_protocol(String)},
* the leading `file://` is cut off and the remainder being used.
*
* @param path the path to the file, maybe a local file URI
*/
public ByteInStream_File(final String path) {
try {
nativeInstance = ctorImpl1(path);
} catch (final Throwable t) {
System.err.println("ByteInStream_File.ctor: native ctor failed: "+t.getMessage());
throw t;
}
}
private static native long ctorImpl1(final String path);
/**
* Construct a stream based byte input stream from filesystem path and parent directory file descriptor
*
* In case the given path is a local file URI starting with `file://`, see jau::io::uri::is_local_file_protocol(),
* the leading `file://` is cut off and the remainder being used.
*
* @param dirfd parent directory file descriptor
* @param path the path to the file, maybe a local file URI
*/
public ByteInStream_File(final int dirfd, final String path) {
try {
nativeInstance = ctorImpl2(dirfd, path);
} catch (final Throwable t) {
System.err.println("ByteInStream_File.ctor: native ctor failed: "+t.getMessage());
throw t;
}
}
private static native long ctorImpl2(final int dirfd, final String path);
/**
* Construct a stream based byte input stream by duplicating given file descriptor
*
* In case the given path is a local file URI starting with `file://`, see jau::io::uri::is_local_file_protocol(),
* the leading `file://` is cut off and the remainder being used.
*
* @param fd file descriptor to duplicate leaving the given `fd` untouched
*/
public ByteInStream_File(final int fd) {
try {
nativeInstance = ctorImpl3(fd);
} catch (final Throwable t) {
System.err.println("ByteInStream_File.ctor: native ctor failed: "+t.getMessage());
throw t;
}
}
private static native long ctorImpl3(final int fd);
@Override
public native void closeStream();
@Override
public void close() {
final long handle;
synchronized( this ) {
handle = nativeInstance;
nativeInstance = 0;
}
if( 0 != handle ) {
dtorImpl(handle);
}
}
private static native void dtorImpl(final long nativeInstance);
@Override
public void finalize() {
close();
}
@Override
public native boolean is_open();
@Override
public void clear(final IOState state) {
clearImpl( state.mask );
}
private native void clearImpl(int s);
/**
* Returns the file descriptor if is_open(), otherwise -1 for no file descriptor.
*
* @see is_open()
*/
public native int fd();
@Override
public IOState rdState() {
return new IOState( rdStateImpl() );
}
private native int rdStateImpl();
@Override
public void setState(final IOState state) {
setStateImpl( state.mask );
}
private native void setStateImpl(int s);
@Override
public native boolean good();
@Override
public native boolean eof();
@Override
public native boolean fail();
@Override
public native boolean bad();
@Override
public boolean end_of_data() { return !good(); }
@Override
public native boolean available(final long n);
@Override
public native int read(final byte[] out, final int offset, final int length);
@Override
public int read(final ByteBuffer out) {
if( !Buffers.isDirect(out) ) {
throw new IllegalArgumentException("out buffer not direct");
}
final int res = read2Impl(out, (int)Buffers.getDirectBufferByteOffset(out));
out.limit(out.position() + res);
return res;
}
private native int read2Impl(Object out, int out_offset);
@Override
public native int peek(byte[] out, final int offset, final int length, final long peek_offset);
@Override
public native String id();
@Override
public native long discard_next(long N);
@Override
public native long tellg();
@Override
public native boolean has_content_size();
@Override
public native long content_size();
@Override
public native String toString();
}
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