From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- libjava/classpath/java/nio/ByteBuffer.java | 655 +++++++++++++++++++++++++++++ 1 file changed, 655 insertions(+) create mode 100644 libjava/classpath/java/nio/ByteBuffer.java (limited to 'libjava/classpath/java/nio/ByteBuffer.java') diff --git a/libjava/classpath/java/nio/ByteBuffer.java b/libjava/classpath/java/nio/ByteBuffer.java new file mode 100644 index 000000000..00db5bf4f --- /dev/null +++ b/libjava/classpath/java/nio/ByteBuffer.java @@ -0,0 +1,655 @@ +/* ByteBuffer.java -- + Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.nio; + +// GCJ LOCAL: Change gnu.classpath.Pointer to RawData +import gnu.gcj.RawData; +import gnu.classpath.Pointer; + +/** + * @since 1.4 + */ +public abstract class ByteBuffer extends Buffer + implements Comparable +{ + ByteOrder endian = ByteOrder.BIG_ENDIAN; + final byte[] backing_buffer; + final int array_offset; + + ByteBuffer (int capacity, int limit, int position, int mark, + RawData address, byte[] backing_buffer, int array_offset) + { + super (capacity, limit, position, mark, address); + this.backing_buffer = backing_buffer; + this.array_offset = array_offset; + } + + /** + * Allocates a new direct byte buffer. + */ + public static ByteBuffer allocateDirect (int capacity) + { + return DirectByteBufferImpl.allocate (capacity); + } + + /** + * Allocates a new ByteBuffer object with a given capacity. + */ + public static ByteBuffer allocate (int capacity) + { + return wrap(new byte[capacity], 0, capacity); + } + + /** + * Wraps a byte array into a ByteBuffer + * object. + * + * @exception IndexOutOfBoundsException If the preconditions on the offset + * and length parameters do not hold + */ + public static final ByteBuffer wrap (byte[] array, int offset, int length) + { + // FIXME: In GCJ and other implementations where arrays may not + // move we might consider, at least when offset==0: + // return new DirectByteBufferImpl(array, + // address_of_data(array) + offset, + // length, length, 0, false); + // This may be more efficient, mainly because we can then use the + // same logic for all ByteBuffers. + + return new ByteBufferImpl (array, 0, array.length, offset + length, offset, -1, false); + } + + /** + * Wraps a byte array into a ByteBuffer + * object. + */ + public static final ByteBuffer wrap (byte[] array) + { + return wrap (array, 0, array.length); + } + + /** + * This method transfers bytes from this buffer into the given + * destination array. Before the transfer, it checks if there are fewer than + * length bytes remaining in this buffer. + * + * @param dst The destination array + * @param offset The offset within the array of the first byte + * to be written; must be non-negative and no larger than dst.length. + * @param length The maximum number of bytes to be written to the given array; + * must be non-negative and no larger than dst.length - offset. + * + * @exception BufferUnderflowException If there are fewer than length + * bytes remaining in this buffer. + * @exception IndexOutOfBoundsException If the preconditions on the offset + * and length parameters do not hold. + */ + public ByteBuffer get (byte[] dst, int offset, int length) + { + checkArraySize(dst.length, offset, length); + checkForUnderflow(length); + + for (int i = offset; i < offset + length; i++) + { + dst [i] = get (); + } + + return this; + } + + /** + * This method transfers bytes from this buffer into the given + * destination array. + * + * @param dst The byte array to write into. + * + * @exception BufferUnderflowException If there are fewer than dst.length + * bytes remaining in this buffer. + */ + public ByteBuffer get (byte[] dst) + { + return get (dst, 0, dst.length); + } + + /** + * Writes the content of the the ByteBUFFER src + * into the buffer. Before the transfer, it checks if there is fewer than + * src.remaining() space remaining in this buffer. + * + * @param src The source data. + * + * @exception BufferOverflowException If there is insufficient space in this + * buffer for the remaining bytes in the source buffer. + * @exception IllegalArgumentException If the source buffer is this buffer. + * @exception ReadOnlyBufferException If this buffer is read-only. + */ + public ByteBuffer put (ByteBuffer src) + { + if (src == this) + throw new IllegalArgumentException (); + + checkForOverflow(src.remaining()); + + if (src.remaining () > 0) + { + byte[] toPut = new byte [src.remaining ()]; + src.get (toPut); + put (toPut); + } + + return this; + } + + /** + * Writes the content of the the byte array src + * into the buffer. Before the transfer, it checks if there is fewer than + * length space remaining in this buffer. + * + * @param src The array to copy into the buffer. + * @param offset The offset within the array of the first byte to be read; + * must be non-negative and no larger than src.length. + * @param length The number of bytes to be read from the given array; + * must be non-negative and no larger than src.length - offset. + * + * @exception BufferOverflowException If there is insufficient space in this + * buffer for the remaining bytes in the source array. + * @exception IndexOutOfBoundsException If the preconditions on the offset + * and length parameters do not hold + * @exception ReadOnlyBufferException If this buffer is read-only. + */ + public ByteBuffer put (byte[] src, int offset, int length) + { + checkArraySize(src.length, offset, length); + checkForOverflow(length); + + for (int i = offset; i < offset + length; i++) + put (src [i]); + + return this; + } + + /** + * Writes the content of the the byte array src + * into the buffer. + * + * @param src The array to copy into the buffer. + * + * @exception BufferOverflowException If there is insufficient space in this + * buffer for the remaining bytes in the source array. + * @exception ReadOnlyBufferException If this buffer is read-only. + */ + public final ByteBuffer put (byte[] src) + { + return put (src, 0, src.length); + } + + /** + * Tells whether ot not this buffer is backed by an accessible + * byte array. + */ + public final boolean hasArray () + { + return (backing_buffer != null + && !isReadOnly ()); + } + + /** + * Returns the byte array that backs this buffer. + * + * @exception ReadOnlyBufferException If this buffer is read-only. + * @exception UnsupportedOperationException If this buffer is not backed + * by an accessible array. + */ + public final byte[] array () + { + if (backing_buffer == null) + throw new UnsupportedOperationException (); + + checkIfReadOnly(); + + return backing_buffer; + } + + /** + * Returns the offset within this buffer's backing array of the first element. + * + * @exception ReadOnlyBufferException If this buffer is read-only. + * @exception UnsupportedOperationException If this buffer is not backed + * by an accessible array. + */ + public final int arrayOffset () + { + if (backing_buffer == null) + throw new UnsupportedOperationException (); + + checkIfReadOnly(); + + return array_offset; + } + + /** + * Calculates a hash code for this buffer. + * + * This is done with int arithmetic, + * where ** represents exponentiation, by this formula:
+ * s[position()] + 31 + (s[position()+1] + 30)*31**1 + ... + + * (s[limit()-1]+30)*31**(limit()-1). + * Where s is the buffer data. Note that the hashcode is dependent + * on buffer content, and therefore is not useful if the buffer + * content may change. + * + * @return the hash code + */ + public int hashCode () + { + int hashCode = get(position()) + 31; + int multiplier = 1; + for (int i = position() + 1; i < limit(); ++i) + { + multiplier *= 31; + hashCode += (get(i) + 30)*multiplier; + } + return hashCode; + } + + /** + * Checks if this buffer is equal to obj. + */ + public boolean equals (Object obj) + { + if (obj instanceof ByteBuffer) + { + return compareTo ((ByteBuffer) obj) == 0; + } + + return false; + } + + /** + * Compares two ByteBuffer objects. + * + * @exception ClassCastException If obj is not an object derived from + * ByteBuffer. + */ + public int compareTo (ByteBuffer other) + { + int num = Math.min(remaining(), other.remaining()); + int pos_this = position(); + int pos_other = other.position(); + + for (int count = 0; count < num; count++) + { + byte a = get(pos_this++); + byte b = other.get(pos_other++); + + if (a == b) + continue; + + if (a < b) + return -1; + + return 1; + } + + return remaining() - other.remaining(); + } + + /** + * Returns the byte order of this buffer. + */ + public final ByteOrder order () + { + return endian; + } + + /** + * Modifies this buffer's byte order. + */ + public final ByteBuffer order (ByteOrder endian) + { + this.endian = endian; + return this; + } + + /** + * Reads the byte at this buffer's current position, + * and then increments the position. + * + * @exception BufferUnderflowException If there are no remaining + * bytes in this buffer. + */ + public abstract byte get (); + + /** + * Writes the byte at this buffer's current position, + * and then increments the position. + * + * @exception BufferOverflowException If there no remaining + * bytes in this buffer. + * @exception ReadOnlyBufferException If this buffer is read-only. + */ + public abstract ByteBuffer put (byte b); + + /** + * Absolute get method. + * + * @exception IndexOutOfBoundsException If index is negative or not smaller + * than the buffer's limit. + */ + public abstract byte get (int index); + + /** + * Absolute put method. + * + * @exception IndexOutOfBoundsException If index is negative or not smaller + * than the buffer's limit. + * @exception ReadOnlyBufferException If this buffer is read-only. + */ + public abstract ByteBuffer put (int index, byte b); + + /** + * Compacts this buffer. + * + * @exception ReadOnlyBufferException If this buffer is read-only. + */ + public abstract ByteBuffer compact (); + + void shiftDown (int dst_offset, int src_offset, int count) + { + for (int i = 0; i < count; i++) + put(dst_offset + i, get(src_offset + i)); + } + + /** + * Tells whether or not this buffer is direct. + */ + public abstract boolean isDirect (); + + /** + * Creates a new ByteBuffer whose content is a shared + * subsequence of this buffer's content. + */ + public abstract ByteBuffer slice (); + + /** + * Creates a new ByteBuffer that shares this buffer's + * content. + */ + public abstract ByteBuffer duplicate (); + + /** + * Creates a new read-only ByteBuffer that shares this + * buffer's content. + */ + public abstract ByteBuffer asReadOnlyBuffer (); + + /** + * Creates a view of this byte buffer as a short buffer. + */ + public abstract ShortBuffer asShortBuffer (); + + /** + * Creates a view of this byte buffer as a char buffer. + */ + public abstract CharBuffer asCharBuffer (); + + /** + * Creates a view of this byte buffer as an integer buffer. + */ + public abstract IntBuffer asIntBuffer (); + + /** + * Creates a view of this byte buffer as a long buffer. + */ + public abstract LongBuffer asLongBuffer (); + + /** + * Creates a view of this byte buffer as a float buffer. + */ + public abstract FloatBuffer asFloatBuffer (); + + /** + * Creates a view of this byte buffer as a double buffer. + */ + public abstract DoubleBuffer asDoubleBuffer (); + + /** + * Relative get method for reading a character value. + * + * @exception BufferUnderflowException If there are fewer than two bytes + * remaining in this buffer. + */ + public abstract char getChar (); + + /** + * Relative put method for writing a character value. + * + * @exception BufferOverflowException If this buffer's current position is + * not smaller than its limit. + */ + public abstract ByteBuffer putChar (char value); + + /** + * Absolute get method for reading a character value. + * + * @exception IndexOutOfBoundsException If there are fewer than two bytes + * remaining in this buffer + */ + public abstract char getChar (int index); + + /** + * Absolute put method for writing a character value. + * + * @exception IndexOutOfBoundsException If index is negative or not smaller + * than the buffer's limit, minus one. + */ + public abstract ByteBuffer putChar (int index, char value); + + /** + * Relative get method for reading a short value. + * + * @exception BufferUnderflowException If index is negative or not smaller + * than the buffer's limit, minus one. + */ + public abstract short getShort (); + + /** + * Relative put method for writing a short value. + * + * @exception BufferOverflowException If this buffer's current position is + * not smaller than its limit. + */ + public abstract ByteBuffer putShort (short value); + + /** + * Absolute get method for reading a short value. + * + * @exception IndexOutOfBoundsException If there are fewer than two bytes + * remaining in this buffer + */ + public abstract short getShort (int index); + + /** + * Absolute put method for writing a short value. + * + * @exception IndexOutOfBoundsException If index is negative or not smaller + * than the buffer's limit, minus one. + */ + public abstract ByteBuffer putShort (int index, short value); + + /** + * Relative get method for reading an integer value. + * + * @exception BufferUnderflowException If there are fewer than four bytes + * remaining in this buffer. + */ + public abstract int getInt (); + + /** + * Relative put method for writing an integer value. + * + * @exception BufferOverflowException If this buffer's current position is + * not smaller than its limit. + */ + public abstract ByteBuffer putInt (int value); + + /** + * Absolute get method for reading an integer value. + * + * @exception IndexOutOfBoundsException If index is negative or not smaller + * than the buffer's limit, minus three. + */ + public abstract int getInt (int index); + + /** + * Absolute put method for writing an integer value. + * + * @exception IndexOutOfBoundsException If index is negative or not smaller + * than the buffer's limit, minus three. + */ + public abstract ByteBuffer putInt (int index, int value); + + /** + * Relative get method for reading a long value. + * + * @exception BufferUnderflowException If there are fewer than eight bytes + * remaining in this buffer. + */ + public abstract long getLong (); + + /** + * Relative put method for writing a long value. + * + * @exception BufferOverflowException If this buffer's current position is + * not smaller than its limit. + */ + public abstract ByteBuffer putLong (long value); + + /** + * Absolute get method for reading a long value. + * + * @exception IndexOutOfBoundsException If index is negative or not smaller + * than the buffer's limit, minus seven. + */ + public abstract long getLong (int index); + + /** + * Absolute put method for writing a float value. + * + * @exception IndexOutOfBoundsException If index is negative or not smaller + * than the buffer's limit, minus seven. + */ + public abstract ByteBuffer putLong (int index, long value); + + /** + * Relative get method for reading a float value. + * + * @exception BufferUnderflowException If there are fewer than four bytes + * remaining in this buffer. + */ + public abstract float getFloat (); + + /** + * Relative put method for writing a float value. + * + * @exception BufferOverflowException If there are fewer than four bytes + * remaining in this buffer. + */ + public abstract ByteBuffer putFloat (float value); + + /** + * Absolute get method for reading a float value. + * + * @exception IndexOutOfBoundsException If index is negative or not smaller + * than the buffer's limit, minus three. + */ + public abstract float getFloat (int index); + + /** + * Relative put method for writing a float value. + * + * @exception IndexOutOfBoundsException If index is negative or not smaller + * than the buffer's limit, minus three. + */ + public abstract ByteBuffer putFloat (int index, float value); + + /** + * Relative get method for reading a double value. + * + * @exception BufferUnderflowException If there are fewer than eight bytes + * remaining in this buffer. + */ + public abstract double getDouble (); + + /** + * Relative put method for writing a double value. + * + * @exception BufferOverflowException If this buffer's current position is + * not smaller than its limit. + */ + public abstract ByteBuffer putDouble (double value); + + /** + * Absolute get method for reading a double value. + * + * @exception IndexOutOfBoundsException If index is negative or not smaller + * than the buffer's limit, minus seven. + */ + public abstract double getDouble (int index); + + /** + * Absolute put method for writing a double value. + * + * @exception IndexOutOfBoundsException If index is negative or not smaller + * than the buffer's limit, minus seven. + */ + public abstract ByteBuffer putDouble (int index, double value); + + /** + * Returns a string summarizing the state of this buffer. + */ + public String toString () + { + return getClass ().getName () + + "[pos=" + position () + + " lim=" + limit () + + " cap=" + capacity () + "]"; + } +} -- cgit v1.2.3