Java example source code file (ImageOutputStreamImpl.java)
The ImageOutputStreamImpl.java Java example source code/*
* Copyright (c) 2000, 2007, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* questions.
*/
package javax.imageio.stream;
import java.io.IOException;
import java.io.UTFDataFormatException;
import java.nio.ByteOrder;
/**
* An abstract class implementing the <code>ImageOutputStream interface.
* This class is designed to reduce the number of methods that must
* be implemented by subclasses.
*
*/
public abstract class ImageOutputStreamImpl
extends ImageInputStreamImpl
implements ImageOutputStream {
/**
* Constructs an <code>ImageOutputStreamImpl.
*/
public ImageOutputStreamImpl() {
}
public abstract void write(int b) throws IOException;
public void write(byte b[]) throws IOException {
write(b, 0, b.length);
}
public abstract void write(byte b[], int off, int len) throws IOException;
public void writeBoolean(boolean v) throws IOException {
write(v ? 1 : 0);
}
public void writeByte(int v) throws IOException {
write(v);
}
public void writeShort(int v) throws IOException {
if (byteOrder == ByteOrder.BIG_ENDIAN) {
byteBuf[0] = (byte)(v >>> 8);
byteBuf[1] = (byte)(v >>> 0);
} else {
byteBuf[0] = (byte)(v >>> 0);
byteBuf[1] = (byte)(v >>> 8);
}
write(byteBuf, 0, 2);
}
public void writeChar(int v) throws IOException {
writeShort(v);
}
public void writeInt(int v) throws IOException {
if (byteOrder == ByteOrder.BIG_ENDIAN) {
byteBuf[0] = (byte)(v >>> 24);
byteBuf[1] = (byte)(v >>> 16);
byteBuf[2] = (byte)(v >>> 8);
byteBuf[3] = (byte)(v >>> 0);
} else {
byteBuf[0] = (byte)(v >>> 0);
byteBuf[1] = (byte)(v >>> 8);
byteBuf[2] = (byte)(v >>> 16);
byteBuf[3] = (byte)(v >>> 24);
}
write(byteBuf, 0, 4);
}
public void writeLong(long v) throws IOException {
if (byteOrder == ByteOrder.BIG_ENDIAN) {
byteBuf[0] = (byte)(v >>> 56);
byteBuf[1] = (byte)(v >>> 48);
byteBuf[2] = (byte)(v >>> 40);
byteBuf[3] = (byte)(v >>> 32);
byteBuf[4] = (byte)(v >>> 24);
byteBuf[5] = (byte)(v >>> 16);
byteBuf[6] = (byte)(v >>> 8);
byteBuf[7] = (byte)(v >>> 0);
} else {
byteBuf[0] = (byte)(v >>> 0);
byteBuf[1] = (byte)(v >>> 8);
byteBuf[2] = (byte)(v >>> 16);
byteBuf[3] = (byte)(v >>> 24);
byteBuf[4] = (byte)(v >>> 32);
byteBuf[5] = (byte)(v >>> 40);
byteBuf[6] = (byte)(v >>> 48);
byteBuf[7] = (byte)(v >>> 56);
}
// REMIND: Once 6277756 is fixed, we should do a bulk write of all 8
// bytes here as we do in writeShort() and writeInt() for even better
// performance. For now, two bulk writes of 4 bytes each is still
// faster than 8 individual write() calls (see 6347575 for details).
write(byteBuf, 0, 4);
write(byteBuf, 4, 4);
}
public void writeFloat(float v) throws IOException {
writeInt(Float.floatToIntBits(v));
}
public void writeDouble(double v) throws IOException {
writeLong(Double.doubleToLongBits(v));
}
public void writeBytes(String s) throws IOException {
int len = s.length();
for (int i = 0 ; i < len ; i++) {
write((byte)s.charAt(i));
}
}
public void writeChars(String s) throws IOException {
int len = s.length();
byte[] b = new byte[len*2];
int boff = 0;
if (byteOrder == ByteOrder.BIG_ENDIAN) {
for (int i = 0; i < len ; i++) {
int v = s.charAt(i);
b[boff++] = (byte)(v >>> 8);
b[boff++] = (byte)(v >>> 0);
}
} else {
for (int i = 0; i < len ; i++) {
int v = s.charAt(i);
b[boff++] = (byte)(v >>> 0);
b[boff++] = (byte)(v >>> 8);
}
}
write(b, 0, len*2);
}
public void writeUTF(String s) throws IOException {
int strlen = s.length();
int utflen = 0;
char[] charr = new char[strlen];
int c, boff = 0;
s.getChars(0, strlen, charr, 0);
for (int i = 0; i < strlen; i++) {
c = charr[i];
if ((c >= 0x0001) && (c <= 0x007F)) {
utflen++;
} else if (c > 0x07FF) {
utflen += 3;
} else {
utflen += 2;
}
}
if (utflen > 65535) {
throw new UTFDataFormatException("utflen > 65536!");
}
byte[] b = new byte[utflen+2];
b[boff++] = (byte) ((utflen >>> 8) & 0xFF);
b[boff++] = (byte) ((utflen >>> 0) & 0xFF);
for (int i = 0; i < strlen; i++) {
c = charr[i];
if ((c >= 0x0001) && (c <= 0x007F)) {
b[boff++] = (byte) c;
} else if (c > 0x07FF) {
b[boff++] = (byte) (0xE0 | ((c >> 12) & 0x0F));
b[boff++] = (byte) (0x80 | ((c >> 6) & 0x3F));
b[boff++] = (byte) (0x80 | ((c >> 0) & 0x3F));
} else {
b[boff++] = (byte) (0xC0 | ((c >> 6) & 0x1F));
b[boff++] = (byte) (0x80 | ((c >> 0) & 0x3F));
}
}
write(b, 0, utflen + 2);
}
public void writeShorts(short[] s, int off, int len) throws IOException {
// Fix 4430357 - if off + len < 0, overflow occurred
if (off < 0 || len < 0 || off + len > s.length || off + len < 0) {
throw new IndexOutOfBoundsException
("off < 0 || len < 0 || off + len > s.length!");
}
byte[] b = new byte[len*2];
int boff = 0;
if (byteOrder == ByteOrder.BIG_ENDIAN) {
for (int i = 0; i < len; i++) {
short v = s[off + i];
b[boff++] = (byte)(v >>> 8);
b[boff++] = (byte)(v >>> 0);
}
} else {
for (int i = 0; i < len; i++) {
short v = s[off + i];
b[boff++] = (byte)(v >>> 0);
b[boff++] = (byte)(v >>> 8);
}
}
write(b, 0, len*2);
}
public void writeChars(char[] c, int off, int len) throws IOException {
// Fix 4430357 - if off + len < 0, overflow occurred
if (off < 0 || len < 0 || off + len > c.length || off + len < 0) {
throw new IndexOutOfBoundsException
("off < 0 || len < 0 || off + len > c.length!");
}
byte[] b = new byte[len*2];
int boff = 0;
if (byteOrder == ByteOrder.BIG_ENDIAN) {
for (int i = 0; i < len; i++) {
char v = c[off + i];
b[boff++] = (byte)(v >>> 8);
b[boff++] = (byte)(v >>> 0);
}
} else {
for (int i = 0; i < len; i++) {
char v = c[off + i];
b[boff++] = (byte)(v >>> 0);
b[boff++] = (byte)(v >>> 8);
}
}
write(b, 0, len*2);
}
public void writeInts(int[] i, int off, int len) throws IOException {
// Fix 4430357 - if off + len < 0, overflow occurred
if (off < 0 || len < 0 || off + len > i.length || off + len < 0) {
throw new IndexOutOfBoundsException
("off < 0 || len < 0 || off + len > i.length!");
}
byte[] b = new byte[len*4];
int boff = 0;
if (byteOrder == ByteOrder.BIG_ENDIAN) {
for (int j = 0; j < len; j++) {
int v = i[off + j];
b[boff++] = (byte)(v >>> 24);
b[boff++] = (byte)(v >>> 16);
b[boff++] = (byte)(v >>> 8);
b[boff++] = (byte)(v >>> 0);
}
} else {
for (int j = 0; j < len; j++) {
int v = i[off + j];
b[boff++] = (byte)(v >>> 0);
b[boff++] = (byte)(v >>> 8);
b[boff++] = (byte)(v >>> 16);
b[boff++] = (byte)(v >>> 24);
}
}
write(b, 0, len*4);
}
public void writeLongs(long[] l, int off, int len) throws IOException {
// Fix 4430357 - if off + len < 0, overflow occurred
if (off < 0 || len < 0 || off + len > l.length || off + len < 0) {
throw new IndexOutOfBoundsException
("off < 0 || len < 0 || off + len > l.length!");
}
byte[] b = new byte[len*8];
int boff = 0;
if (byteOrder == ByteOrder.BIG_ENDIAN) {
for (int i = 0; i < len; i++) {
long v = l[off + i];
b[boff++] = (byte)(v >>> 56);
b[boff++] = (byte)(v >>> 48);
b[boff++] = (byte)(v >>> 40);
b[boff++] = (byte)(v >>> 32);
b[boff++] = (byte)(v >>> 24);
b[boff++] = (byte)(v >>> 16);
b[boff++] = (byte)(v >>> 8);
b[boff++] = (byte)(v >>> 0);
}
} else {
for (int i = 0; i < len; i++) {
long v = l[off + i];
b[boff++] = (byte)(v >>> 0);
b[boff++] = (byte)(v >>> 8);
b[boff++] = (byte)(v >>> 16);
b[boff++] = (byte)(v >>> 24);
b[boff++] = (byte)(v >>> 32);
b[boff++] = (byte)(v >>> 40);
b[boff++] = (byte)(v >>> 48);
b[boff++] = (byte)(v >>> 56);
}
}
write(b, 0, len*8);
}
public void writeFloats(float[] f, int off, int len) throws IOException {
// Fix 4430357 - if off + len < 0, overflow occurred
if (off < 0 || len < 0 || off + len > f.length || off + len < 0) {
throw new IndexOutOfBoundsException
("off < 0 || len < 0 || off + len > f.length!");
}
byte[] b = new byte[len*4];
int boff = 0;
if (byteOrder == ByteOrder.BIG_ENDIAN) {
for (int i = 0; i < len; i++) {
int v = Float.floatToIntBits(f[off + i]);
b[boff++] = (byte)(v >>> 24);
b[boff++] = (byte)(v >>> 16);
b[boff++] = (byte)(v >>> 8);
b[boff++] = (byte)(v >>> 0);
}
} else {
for (int i = 0; i < len; i++) {
int v = Float.floatToIntBits(f[off + i]);
b[boff++] = (byte)(v >>> 0);
b[boff++] = (byte)(v >>> 8);
b[boff++] = (byte)(v >>> 16);
b[boff++] = (byte)(v >>> 24);
}
}
write(b, 0, len*4);
}
public void writeDoubles(double[] d, int off, int len) throws IOException {
// Fix 4430357 - if off + len < 0, overflow occurred
if (off < 0 || len < 0 || off + len > d.length || off + len < 0) {
throw new IndexOutOfBoundsException
("off < 0 || len < 0 || off + len > d.length!");
}
byte[] b = new byte[len*8];
int boff = 0;
if (byteOrder == ByteOrder.BIG_ENDIAN) {
for (int i = 0; i < len; i++) {
long v = Double.doubleToLongBits(d[off + i]);
b[boff++] = (byte)(v >>> 56);
b[boff++] = (byte)(v >>> 48);
b[boff++] = (byte)(v >>> 40);
b[boff++] = (byte)(v >>> 32);
b[boff++] = (byte)(v >>> 24);
b[boff++] = (byte)(v >>> 16);
b[boff++] = (byte)(v >>> 8);
b[boff++] = (byte)(v >>> 0);
}
} else {
for (int i = 0; i < len; i++) {
long v = Double.doubleToLongBits(d[off + i]);
b[boff++] = (byte)(v >>> 0);
b[boff++] = (byte)(v >>> 8);
b[boff++] = (byte)(v >>> 16);
b[boff++] = (byte)(v >>> 24);
b[boff++] = (byte)(v >>> 32);
b[boff++] = (byte)(v >>> 40);
b[boff++] = (byte)(v >>> 48);
b[boff++] = (byte)(v >>> 56);
}
}
write(b, 0, len*8);
}
public void writeBit(int bit) throws IOException {
writeBits((1L & bit), 1);
}
public void writeBits(long bits, int numBits) throws IOException {
checkClosed();
if (numBits < 0 || numBits > 64) {
throw new IllegalArgumentException("Bad value for numBits!");
}
if (numBits == 0) {
return;
}
// Prologue: deal with pre-existing bits
// Bug 4499158, 4507868 - if we're at the beginning of the stream
// and the bit offset is 0, there can't be any pre-existing bits
if ((getStreamPosition() > 0) || (bitOffset > 0)) {
int offset = bitOffset; // read() will reset bitOffset
int partialByte = read();
if (partialByte != -1) {
seek(getStreamPosition() - 1);
} else {
partialByte = 0;
}
if (numBits + offset < 8) {
// Notch out the partial byte and drop in the new bits
int shift = 8 - (offset+numBits);
int mask = -1 >>> (32 - numBits);
partialByte &= ~(mask << shift); // Clear out old bits
partialByte |= ((bits & mask) << shift); // Or in new ones
write(partialByte);
seek(getStreamPosition() - 1);
bitOffset = offset + numBits;
numBits = 0; // Signal that we are done
} else {
// Fill out the partial byte and reduce numBits
int num = 8 - offset;
int mask = -1 >>> (32 - num);
partialByte &= ~mask; // Clear out bits
partialByte |= ((bits >> (numBits - num)) & mask);
// Note that bitOffset is already 0, so there is no risk
// of this advancing to the next byte
write(partialByte);
numBits -= num;
}
}
// Now write any whole bytes
if (numBits > 7) {
int extra = numBits % 8;
for (int numBytes = numBits / 8; numBytes > 0; numBytes--) {
int shift = (numBytes-1)*8+extra;
int value = (int) ((shift == 0)
? bits & 0xFF
: (bits>>shift) & 0xFF);
write(value);
}
numBits = extra;
}
// Epilogue: write out remaining partial byte, if any
// Note that we may be at EOF, in which case we pad with 0,
// or not, in which case we must preserve the existing bits
if (numBits != 0) {
// If we are not at the end of the file, read the current byte
// If we are at the end of the file, initialize our byte to 0.
int partialByte = 0;
partialByte = read();
if (partialByte != -1) {
seek(getStreamPosition() - 1);
}
// Fix 4494976: writeBit(int) does not pad the remainder
// of the current byte with 0s
else { // EOF
partialByte = 0;
}
int shift = 8 - numBits;
int mask = -1 >>> (32 - numBits);
partialByte &= ~(mask << shift);
partialByte |= (bits & mask) << shift;
// bitOffset is always already 0 when we get here.
write(partialByte);
seek(getStreamPosition() - 1);
bitOffset = numBits;
}
}
/**
* If the bit offset is non-zero, forces the remaining bits
* in the current byte to 0 and advances the stream position
* by one. This method should be called by subclasses at the
* beginning of the <code>write(int) and
* <code>write(byte[], int, int) methods.
*
* @exception IOException if an I/O error occurs.
*/
protected final void flushBits() throws IOException {
checkClosed();
if (bitOffset != 0) {
int offset = bitOffset;
int partialByte = read(); // Sets bitOffset to 0
if (partialByte < 0) {
// Fix 4465683: When bitOffset is set
// to something non-zero beyond EOF,
// we should set that whole byte to
// zero and write it to stream.
partialByte = 0;
bitOffset = 0;
}
else {
seek(getStreamPosition() - 1);
partialByte &= -1 << (8 - offset);
}
write(partialByte);
}
}
}
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