List of usage examples for java.nio ByteBuffer reset
public final Buffer reset()
mark. From source file:com.glaf.core.util.BinaryUtils.java
/** * Returns a copy of the bytes from the given <code>ByteBuffer</code>, * ranging from the the buffer's current position to the buffer's limit; or * null if the input is null.// w w w. j ava 2 s . c o m * <p> * The internal states of the given byte buffer will be restored when this * method completes execution. * <p> * When handling <code>ByteBuffer</code> from user's input, it's typical to * call the {@link #copyBytesFrom(ByteBuffer)} instead of * {@link #copyAllBytesFrom(ByteBuffer)} so as to account for the position * of the input <code>ByteBuffer</code>. The opposite is typically true, * however, when handling <code>ByteBuffer</code> from withint the * unmarshallers of the low-level clients. */ public static byte[] copyBytesFrom(ByteBuffer bb) { if (bb == null) return null; if (bb.hasArray()) return Arrays.copyOfRange(bb.array(), bb.position(), bb.limit()); bb.mark(); try { byte[] dst = new byte[bb.remaining()]; bb.get(dst); return dst; } finally { bb.reset(); } }
From source file:com.nridge.core.base.std.BufUtl.java
/** * Retrieves the operation version code stored within the header of the * <code>ByteBuffer</code> object. * * @param aBuffer Packet byte buffer object. * @return Application specific operation code version value. *//* ww w . jav a 2 s . com*/ @SuppressWarnings({ "UnusedAssignment" }) public static int getVersion(ByteBuffer aBuffer) { int opCode, versionId; if (aBuffer == null) return -1; else { aBuffer.mark(); aBuffer.position(0); opCode = aBuffer.getInt(); versionId = aBuffer.getInt(); aBuffer.reset(); return versionId; } }
From source file:io.Text.java
/** * Returns the next code point at the current position in * the buffer. The buffer's position will be incremented. * Any mark set on this buffer will be changed by this method! *//* w ww . ja va2s. c o m*/ public static int bytesToCodePoint(ByteBuffer bytes) { bytes.mark(); byte b = bytes.get(); bytes.reset(); int extraBytesToRead = bytesFromUTF8[(b & 0xFF)]; if (extraBytesToRead < 0) return -1; // trailing byte! int ch = 0; switch (extraBytesToRead) { case 5: ch += (bytes.get() & 0xFF); ch <<= 6; /* remember, illegal UTF-8 */ case 4: ch += (bytes.get() & 0xFF); ch <<= 6; /* remember, illegal UTF-8 */ case 3: ch += (bytes.get() & 0xFF); ch <<= 6; case 2: ch += (bytes.get() & 0xFF); ch <<= 6; case 1: ch += (bytes.get() & 0xFF); ch <<= 6; case 0: ch += (bytes.get() & 0xFF); } ch -= offsetsFromUTF8[extraBytesToRead]; return ch; }
From source file:org.apache.arrow.vector.util.Text.java
/** * Returns the next code point at the current position in the buffer. The buffer's position will be incremented. Any * mark set on this buffer will be changed by this method! *//*from w ww .j av a2s . c om*/ public static int bytesToCodePoint(ByteBuffer bytes) { bytes.mark(); byte b = bytes.get(); bytes.reset(); int extraBytesToRead = bytesFromUTF8[(b & 0xFF)]; if (extraBytesToRead < 0) { return -1; // trailing byte! } int ch = 0; switch (extraBytesToRead) { case 5: ch += (bytes.get() & 0xFF); ch <<= 6; /* remember, illegal UTF-8 */ case 4: ch += (bytes.get() & 0xFF); ch <<= 6; /* remember, illegal UTF-8 */ case 3: ch += (bytes.get() & 0xFF); ch <<= 6; case 2: ch += (bytes.get() & 0xFF); ch <<= 6; case 1: ch += (bytes.get() & 0xFF); ch <<= 6; case 0: ch += (bytes.get() & 0xFF); } ch -= offsetsFromUTF8[extraBytesToRead]; return ch; }
From source file:org.apache.hadoop.hive.ql.udf.generic.GenericUDFUtils.java
public static int findText(Text text, Text subtext, int start) { if (start < 0) return -1; ByteBuffer src = ByteBuffer.wrap(text.getBytes(), 0, text.getLength()); ByteBuffer tgt = ByteBuffer.wrap(subtext.getBytes(), 0, subtext.getLength()); byte b = tgt.get(); src.position(start);// www . j a va 2s .c om while (src.hasRemaining()) { if (b == src.get()) { src.mark(); tgt.mark(); boolean found = true; int pos = src.position() - 1; while (tgt.hasRemaining()) { if (!src.hasRemaining()) { tgt.reset(); src.reset(); found = false; break; } if (!(tgt.get() == src.get())) { tgt.reset(); src.reset(); found = false; break; } } if (found) return pos; } } return -1; }
From source file:org.apache.hadoop.hive.ql.io.orc.OrcSplit.java
@Override public void write(DataOutput out) throws IOException { //serialize path, offset, length using FileSplit super.write(out); int flags = (hasBase ? BASE_FLAG : 0) | (isOriginal ? ORIGINAL_FLAG : 0) | (hasFooter ? FOOTER_FLAG : 0) | (fileId != null ? HAS_FILEID_FLAG : 0); out.writeByte(flags);//from w w w .j ava2 s .co m out.writeInt(deltas.size()); for (AcidInputFormat.DeltaMetaData delta : deltas) { delta.write(out); } if (hasFooter) { // serialize FileMetaInfo fields Text.writeString(out, fileMetaInfo.compressionType); WritableUtils.writeVInt(out, fileMetaInfo.bufferSize); WritableUtils.writeVInt(out, fileMetaInfo.metadataSize); // serialize FileMetaInfo field footer ByteBuffer footerBuff = fileMetaInfo.footerBuffer; footerBuff.reset(); // write length of buffer WritableUtils.writeVInt(out, footerBuff.limit() - footerBuff.position()); out.write(footerBuff.array(), footerBuff.position(), footerBuff.limit() - footerBuff.position()); WritableUtils.writeVInt(out, fileMetaInfo.writerVersion.getId()); } if (fileId != null) { out.writeLong(fileId.longValue()); } }
From source file:Main.java
public static List<ByteBuffer> mergeAdjacentBuffers(List<ByteBuffer> samples) { ArrayList<ByteBuffer> nuSamples = new ArrayList<ByteBuffer>(samples.size()); for (ByteBuffer buffer : samples) { int lastIndex = nuSamples.size() - 1; if (lastIndex >= 0 && buffer.hasArray() && nuSamples.get(lastIndex).hasArray() && buffer.array() == nuSamples.get(lastIndex).array() && nuSamples.get(lastIndex).arrayOffset() + nuSamples.get(lastIndex).limit() == buffer.arrayOffset()) { ByteBuffer oldBuffer = nuSamples.remove(lastIndex); ByteBuffer nu = ByteBuffer .wrap(buffer.array(), oldBuffer.arrayOffset(), oldBuffer.limit() + buffer.limit()).slice(); // We need to slice here since wrap([], offset, length) just sets position and not the arrayOffset. nuSamples.add(nu);/*from w w w . ja va 2s . c o m*/ } else if (lastIndex >= 0 && buffer instanceof MappedByteBuffer && nuSamples.get(lastIndex) instanceof MappedByteBuffer && nuSamples.get(lastIndex) .limit() == nuSamples.get(lastIndex).capacity() - buffer.capacity()) { // This can go wrong - but will it? ByteBuffer oldBuffer = nuSamples.get(lastIndex); oldBuffer.limit(buffer.limit() + oldBuffer.limit()); } else { buffer.reset(); nuSamples.add(buffer); } } return nuSamples; }
From source file:org.commoncrawl.service.queryserver.master.S3Helper.java
static int scanForGZIPHeader(ByteBuffer byteBuffer) throws IOException { LOG.info("*** SCANNING FOR GZIP MAGIC Bytes:" + Byte.toString((byte) StreamingArcFileReader.GZIP_MAGIC) + " " + Byte.toString((byte) (StreamingArcFileReader.GZIP_MAGIC >> 8)) + " BufferSize is:" + byteBuffer.limit() + " Remaining:" + byteBuffer.remaining()); int limit = byteBuffer.limit(); while (byteBuffer.position() + 2 < limit) { //LOG.info("Reading Byte At:"+ byteBuffer.position()); int b = byteBuffer.get(); //LOG.info("First Byte is:"+ b); if (b == (byte) (StreamingArcFileReader.GZIP_MAGIC)) { byteBuffer.mark();/*from ww w .ja v a 2 s . c o m*/ byte b2 = byteBuffer.get(); //LOG.info("Second Byte is:"+ b2); if (b2 == (byte) (StreamingArcFileReader.GZIP_MAGIC >> 8)) { byte b3 = byteBuffer.get(); if (b3 == Deflater.DEFLATED) { LOG.info("Found GZip Magic at:" + (byteBuffer.position() - 3)); return byteBuffer.position() - 3; } } byteBuffer.reset(); } } LOG.error("Failed to Find GZIP Magic!!"); //LOG.error(Arrays.toString(byteBuffer.array())); return -1; }
From source file:org.apache.hadoop.util.Crc32PerformanceTest.java
private ByteBuffer newData() { final byte[] bytes = new byte[dataLengthMB << 20]; new Random().nextBytes(bytes); final ByteBuffer dataBufs = allocateByteBuffer(bytes.length); dataBufs.mark();/*from w ww . j a v a 2 s . co m*/ dataBufs.put(bytes); dataBufs.reset(); return dataBufs; }
From source file:com.homeadvisor.kafdrop.service.MessageInspector.java
private byte[] readBytes(ByteBuffer buffer, int offset, int size) { byte[] dest = new byte[size]; if (buffer.hasArray()) { System.arraycopy(buffer.array(), buffer.arrayOffset() + offset, dest, 0, size); } else {//from w w w. ja v a2 s .c o m buffer.mark(); buffer.get(dest); buffer.reset(); } return dest; }