mirror of git://gcc.gnu.org/git/gcc.git
375 lines
9.8 KiB
Java
375 lines
9.8 KiB
Java
/* ImageOutputStream.java --
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Copyright (C) 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.imageio.stream;
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import java.io.IOException;
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import java.io.UTFDataFormatException;
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import java.nio.ByteOrder;
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/**
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* @author Michael Koch (konqueror@gmx.de)
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*/
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public abstract class ImageOutputStreamImpl extends ImageInputStreamImpl
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implements ImageOutputStream
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{
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public ImageOutputStreamImpl()
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{
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// Do nothing here.
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}
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protected final void flushBits()
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throws IOException
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{
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checkClosed();
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if (bitOffset != 0)
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{
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int offset = bitOffset;
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int partial = read();
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if (partial < 0)
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{
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partial = 0;
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bitOffset = 0;
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}
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else
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{
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seek(getStreamPosition() - 1);
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partial &= -1 << (8 - offset);
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}
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write(partial);
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}
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}
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public void write(byte[] data)
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throws IOException
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{
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write(data, 0, data.length);
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}
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public abstract void write(byte[] data, int offset, int len)
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throws IOException;
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public abstract void write(int value)
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throws IOException;
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public void writeBit(int bit)
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throws IOException
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{
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writeBits(1L & bit, 1);
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}
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public void writeBits(long bits, int numBits)
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throws IOException
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{
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checkClosed();
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// Append chunk of bits to any preexisting bits, if any.
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if (getStreamPosition() > 0 || bitOffset > 0)
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{
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int offs = bitOffset;
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int partial = read();
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if (partial != -1)
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seek(getStreamPosition() - 1);
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else
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partial = 0;
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if (numBits + offs < 8)
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{
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// Append complete bits to partial byte.
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int shift = 8 - (offs + numBits);
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int mask = -1 >>> (32 - numBits);
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partial &= ~(mask << shift);
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partial |= (bits & mask) << shift;
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write(partial);
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seek(getStreamPosition() - 1);
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bitOffset = offs + numBits;
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numBits = 0;
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}
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else
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{
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// Append bits and decrease numBits accordingly.
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int num = 8 - offs;
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int mask = -1 >>> (32 - num);
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partial &= ~mask;
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partial |= (bits >> (numBits - num)) & mask;
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write(partial);
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numBits -= num;
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}
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}
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// Write out whole chunks, if any.
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if (numBits > 7)
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{
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int remaining = numBits % 8;
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for (int numBytes = numBits / 8; numBytes > 0; numBytes--)
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{
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int shift = (numBytes - 1) * 8 + remaining;
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int value = (int) ((shift == 0) ? bits & 0xff
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: (bits >> shift) & 0xff);
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write(value);
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}
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numBits = remaining;
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}
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// Write remaing partial bytes.
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if (numBits != 0)
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{
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int partial = read();
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if (partial == -1)
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{
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seek(getStreamPosition() - 1);
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}
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else
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{
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partial = 0;
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}
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int shift = 8 - numBits;
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int mask = -1 >>> (32 - numBits);
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partial &= ~(mask << shift);
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partial |= (bits & mask) << shift;
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write(partial);
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seek(getStreamPosition() - 1);
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bitOffset = numBits;
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}
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}
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public void writeBoolean(boolean value)
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throws IOException
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{
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writeByte(value ? 1 : 0);
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}
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public void writeByte(int value)
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throws IOException
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{
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write(value & 0xff);
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}
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public void writeBytes(String data)
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throws IOException
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{
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// This is bogus, but it is how the method is specified.
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// Sun ought to deprecate this method.
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int len = data.length();
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for (int i = 0; i < len; ++i)
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writeByte(data.charAt(i));
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}
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public void writeChar(int value)
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throws IOException
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{
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writeShort(value);
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}
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public void writeChars(char[] data, int offset, int len)
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throws IOException
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{
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for(int i = 0; i < len; ++len)
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writeChar(data[offset + i]);
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}
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public void writeChars(String data)
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throws IOException
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{
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int len = data.length();
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for (int i = 0; i < len; ++i)
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writeChar(data.charAt(i));
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}
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public void writeDouble(double value)
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throws IOException
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{
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writeLong(Double.doubleToLongBits(value));
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}
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public void writeDoubles(double[] data, int offset, int len)
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throws IOException
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{
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for(int i = 0; i < len; ++len)
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writeDouble(data[offset + i]);
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}
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public void writeFloat(float value)
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throws IOException
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{
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writeInt(Float.floatToIntBits(value));
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}
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public void writeFloats(float[] data, int offset, int len)
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throws IOException
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{
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for(int i = 0; i < len; ++len)
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writeFloat(data[offset + i]);
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}
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public void writeInt(int value)
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throws IOException
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{
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if (getByteOrder() == ByteOrder.LITTLE_ENDIAN)
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{
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buffer[0] = ((byte) value);
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buffer[1] = ((byte) (value >> 8));
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buffer[2] = ((byte) (value >> 16));
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buffer[3] = ((byte) (value >> 24));
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}
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else
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{
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buffer[0] = ((byte) (value >> 24));
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buffer[1] = ((byte) (value >> 16));
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buffer[2] = ((byte) (value >> 8));
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buffer[3] = ((byte) value);
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}
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write(buffer, 0, 4);
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}
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public void writeInts(int[] data, int offset, int len)
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throws IOException
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{
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for(int i = 0; i < len; ++len)
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writeInt(data[offset + i]);
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}
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public void writeLong(long value)
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throws IOException
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{
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if (getByteOrder() == ByteOrder.LITTLE_ENDIAN)
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{
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buffer[0] = ((byte) value);
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buffer[1] = ((byte) (value >> 8));
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buffer[2] = ((byte) (value >> 16));
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buffer[3] = ((byte) (value >> 24));
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buffer[4] = ((byte) (value >> 32));
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buffer[5] = ((byte) (value >> 40));
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buffer[6] = ((byte) (value >> 48));
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buffer[7] = ((byte) (value >> 56));
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}
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else
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{
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buffer[0] = ((byte) (value >> 56));
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buffer[1] = ((byte) (value >> 48));
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buffer[2] = ((byte) (value >> 40));
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buffer[3] = ((byte) (value >> 32));
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buffer[4] = ((byte) (value >> 24));
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buffer[5] = ((byte) (value >> 16));
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buffer[6] = ((byte) (value >> 8));
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buffer[7] = ((byte) value);
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}
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write(buffer, 0, 8);
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}
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public void writeLongs(long[] data, int offset, int len)
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throws IOException
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{
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for(int i = 0; i < len; ++len)
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writeLong(data[offset + i]);
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}
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public void writeShort(int value)
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throws IOException
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{
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if (getByteOrder() == ByteOrder.LITTLE_ENDIAN)
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{
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buffer[0] = ((byte) value);
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buffer[1] = ((byte) (value >> 8));
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}
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else
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{
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buffer[0] = ((byte) (value >> 8));
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buffer[1] = ((byte) value);
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}
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write(buffer, 0, 2);
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}
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public void writeShorts(short[] data, int offset, int len)
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throws IOException
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{
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for(int i = 0; i < len; ++len)
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writeShort(data[offset + i]);
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}
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public void writeUTF(String value)
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throws IOException
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{
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// NOTE: this code comes directly from DataOutputStream.
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int len = value.length();
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int sum = 0;
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for (int i = 0; i < len && sum <= 65535; ++i)
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{
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char c = value.charAt(i);
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if (c >= '\u0001' && c <= '\u007f')
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sum += 1;
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else if (c == '\u0000' || (c >= '\u0080' && c <= '\u07ff'))
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sum += 2;
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else
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sum += 3;
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}
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if (sum > 65535)
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throw new UTFDataFormatException ();
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int pos = 0;
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byte[] buf = new byte[sum];
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for (int i = 0; i < len; ++i)
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{
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char c = value.charAt(i);
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if (c >= '\u0001' && c <= '\u007f')
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buf[pos++] = (byte) c;
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else if (c == '\u0000' || (c >= '\u0080' && c <= '\u07ff'))
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{
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buf[pos++] = (byte) (0xc0 | (0x1f & (c >> 6)));
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buf[pos++] = (byte) (0x80 | (0x3f & c));
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}
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else
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{
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// JSL says the first byte should be or'd with 0xc0, but
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// that is a typo. Unicode says 0xe0, and that is what is
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// consistent with DataInputStream.
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buf[pos++] = (byte) (0xe0 | (0x0f & (c >> 12)));
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buf[pos++] = (byte) (0x80 | (0x3f & (c >> 6)));
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buf[pos++] = (byte) (0x80 | (0x3f & c));
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}
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}
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writeShort (sum);
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write(buf, 0, sum);
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}
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}
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