下面列出了javax.imageio.stream.ImageInputStream#read ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
public boolean canDecodeInput(Object source) throws IOException {
if (!(source instanceof ImageInputStream)) {
return false;
}
ImageInputStream iis = (ImageInputStream) source;
iis.mark();
// If the first two bytes are a JPEG SOI marker, it's probably
// a JPEG file. If they aren't, it definitely isn't a JPEG file.
int byte1 = iis.read();
int byte2 = iis.read();
iis.reset();
if ((byte1 == 0xFF) && (byte2 == JPEG.SOI)) {
return true;
}
return false;
}
public boolean canDecodeInput(Object source) throws IOException {
if (!(source instanceof ImageInputStream)) {
return false;
}
ImageInputStream iis = (ImageInputStream) source;
iis.mark();
// If the first two bytes are a JPEG SOI marker, it's probably
// a JPEG file. If they aren't, it definitely isn't a JPEG file.
int byte1 = iis.read();
int byte2 = iis.read();
iis.reset();
if ((byte1 == 0xFF) && (byte2 == JPEG.SOI)) {
return true;
}
return false;
}
public boolean canDecodeInput(Object source) throws IOException {
if (!(source instanceof ImageInputStream)) {
return false;
}
ImageInputStream iis = (ImageInputStream) source;
iis.mark();
// If the first two bytes are a JPEG SOI marker, it's probably
// a JPEG file. If they aren't, it definitely isn't a JPEG file.
int byte1 = iis.read();
int byte2 = iis.read();
iis.reset();
if ((byte1 == 0xFF) && (byte2 == JPEG.SOI)) {
return true;
}
return false;
}
void readByteBuffer(ImageInputStream iis,
byte [] data,
JPEGImageReader reader,
float workPortion,
float workOffset) throws IOException {
int progInterval = Math.max((int)(data.length/20/workPortion),
1);
for (int offset = 0;
offset < data.length;) {
int len = Math.min(progInterval, data.length-offset);
iis.read(data, offset, len);
offset += progInterval;
float percentDone = ((float) offset* 100)
/ data.length
* workPortion + workOffset;
if (percentDone > 100.0F) {
percentDone = 100.0F;
}
reader.thumbnailProgress (percentDone);
}
}
void readByteBuffer(ImageInputStream iis,
byte [] data,
JPEGImageReader reader,
float workPortion,
float workOffset) throws IOException {
int progInterval = Math.max((int)(data.length/20/workPortion),
1);
for (int offset = 0;
offset < data.length;) {
int len = Math.min(progInterval, data.length-offset);
iis.read(data, offset, len);
offset += progInterval;
float percentDone = ((float) offset* 100)
/ data.length
* workPortion + workOffset;
if (percentDone > 100.0F) {
percentDone = 100.0F;
}
reader.thumbnailProgress (percentDone);
}
}
void readByteBuffer(ImageInputStream iis,
byte [] data,
JPEGImageReader reader,
float workPortion,
float workOffset) throws IOException {
int progInterval = Math.max((int)(data.length/20/workPortion),
1);
for (int offset = 0;
offset < data.length;) {
int len = Math.min(progInterval, data.length-offset);
iis.read(data, offset, len);
offset += progInterval;
float percentDone = ((float) offset* 100)
/ data.length
* workPortion + workOffset;
if (percentDone > 100.0F) {
percentDone = 100.0F;
}
reader.thumbnailProgress (percentDone);
}
}
void readByteBuffer(ImageInputStream iis,
byte [] data,
JPEGImageReader reader,
float workPortion,
float workOffset) throws IOException {
int progInterval = Math.max((int)(data.length/20/workPortion),
1);
for (int offset = 0;
offset < data.length;) {
int len = Math.min(progInterval, data.length-offset);
iis.read(data, offset, len);
offset += progInterval;
float percentDone = ((float) offset* 100)
/ data.length
* workPortion + workOffset;
if (percentDone > 100.0F) {
percentDone = 100.0F;
}
reader.thumbnailProgress (percentDone);
}
}
void readByteBuffer(ImageInputStream iis,
byte [] data,
JPEGImageReader reader,
float workPortion,
float workOffset) throws IOException {
int progInterval = Math.max((int)(data.length/20/workPortion),
1);
for (int offset = 0;
offset < data.length;) {
int len = Math.min(progInterval, data.length-offset);
iis.read(data, offset, len);
offset += progInterval;
float percentDone = ((float) offset* 100)
/ data.length
* workPortion + workOffset;
if (percentDone > 100.0F) {
percentDone = 100.0F;
}
reader.thumbnailProgress (percentDone);
}
}
public boolean canDecodeInput(Object source) throws IOException {
if (!(source instanceof ImageInputStream)) {
return false;
}
ImageInputStream iis = (ImageInputStream) source;
iis.mark();
// If the first two bytes are a JPEG SOI marker, it's probably
// a JPEG file. If they aren't, it definitely isn't a JPEG file.
int byte1 = iis.read();
int byte2 = iis.read();
iis.reset();
if ((byte1 == 0xFF) && (byte2 == JPEG.SOI)) {
return true;
}
return false;
}
public boolean canDecodeInput(Object source) throws IOException {
if (!(source instanceof ImageInputStream)) {
return false;
}
ImageInputStream iis = (ImageInputStream) source;
iis.mark();
// If the first two bytes are a JPEG SOI marker, it's probably
// a JPEG file. If they aren't, it definitely isn't a JPEG file.
int byte1 = iis.read();
int byte2 = iis.read();
iis.reset();
if ((byte1 == 0xFF) && (byte2 == JPEG.SOI)) {
return true;
}
return false;
}
void readByteBuffer(ImageInputStream iis,
byte [] data,
JPEGImageReader reader,
float workPortion,
float workOffset) throws IOException {
int progInterval = Math.max((int)(data.length/20/workPortion),
1);
for (int offset = 0;
offset < data.length;) {
int len = Math.min(progInterval, data.length-offset);
iis.read(data, offset, len);
offset += progInterval;
float percentDone = ((float) offset* 100)
/ data.length
* workPortion + workOffset;
if (percentDone > 100.0F) {
percentDone = 100.0F;
}
reader.thumbnailProgress (percentDone);
}
}
void readByteBuffer(ImageInputStream iis,
byte [] data,
JPEGImageReader reader,
float workPortion,
float workOffset) throws IOException {
int progInterval = Math.max((int)(data.length/20/workPortion),
1);
for (int offset = 0;
offset < data.length;) {
int len = Math.min(progInterval, data.length-offset);
iis.read(data, offset, len);
offset += progInterval;
float percentDone = ((float) offset* 100)
/ data.length
* workPortion + workOffset;
if (percentDone > 100.0F) {
percentDone = 100.0F;
}
reader.thumbnailProgress (percentDone);
}
}
BufferedImage getThumbnail(ImageInputStream iis,
JPEGImageReader reader)
throws IOException {
iis.mark();
iis.seek(streamPos);
// read the palette
byte [] palette = new byte [PALETTE_SIZE];
float palettePart = ((float) PALETTE_SIZE) / getLength();
readByteBuffer(iis,
palette,
reader,
palettePart,
0.0F);
DataBufferByte buffer = new DataBufferByte(thumbWidth*thumbHeight);
readByteBuffer(iis,
buffer.getData(),
reader,
1.0F-palettePart,
palettePart);
iis.read();
iis.reset();
IndexColorModel cm = new IndexColorModel(8,
256,
palette,
0,
false);
SampleModel sm = cm.createCompatibleSampleModel(thumbWidth,
thumbHeight);
WritableRaster raster =
Raster.createWritableRaster(sm, buffer, null);
return new BufferedImage(cm,
raster,
false,
null);
}
BufferedImage getThumbnail(ImageInputStream iis,
JPEGImageReader reader)
throws IOException {
iis.mark();
iis.seek(streamPos);
// read the palette
byte [] palette = new byte [PALETTE_SIZE];
float palettePart = ((float) PALETTE_SIZE) / getLength();
readByteBuffer(iis,
palette,
reader,
palettePart,
0.0F);
DataBufferByte buffer = new DataBufferByte(thumbWidth*thumbHeight);
readByteBuffer(iis,
buffer.getData(),
reader,
1.0F-palettePart,
palettePart);
iis.read();
iis.reset();
IndexColorModel cm = new IndexColorModel(8,
256,
palette,
0,
false);
SampleModel sm = cm.createCompatibleSampleModel(thumbWidth,
thumbHeight);
WritableRaster raster =
Raster.createWritableRaster(sm, buffer, null);
return new BufferedImage(cm,
raster,
false,
null);
}
BufferedImage getThumbnail(ImageInputStream iis,
JPEGImageReader reader)
throws IOException {
iis.mark();
iis.seek(streamPos);
// read the palette
byte [] palette = new byte [PALETTE_SIZE];
float palettePart = ((float) PALETTE_SIZE) / getLength();
readByteBuffer(iis,
palette,
reader,
palettePart,
0.0F);
DataBufferByte buffer = new DataBufferByte(thumbWidth*thumbHeight);
readByteBuffer(iis,
buffer.getData(),
reader,
1.0F-palettePart,
palettePart);
iis.read();
iis.reset();
IndexColorModel cm = new IndexColorModel(8,
256,
palette,
0,
false);
SampleModel sm = cm.createCompatibleSampleModel(thumbWidth,
thumbHeight);
WritableRaster raster =
Raster.createWritableRaster(sm, buffer, null);
return new BufferedImage(cm,
raster,
false,
null);
}
BufferedImage getThumbnail(ImageInputStream iis,
JPEGImageReader reader)
throws IOException {
iis.mark();
iis.seek(streamPos);
// read the palette
byte [] palette = new byte [PALETTE_SIZE];
float palettePart = ((float) PALETTE_SIZE) / getLength();
readByteBuffer(iis,
palette,
reader,
palettePart,
0.0F);
DataBufferByte buffer = new DataBufferByte(thumbWidth*thumbHeight);
readByteBuffer(iis,
buffer.getData(),
reader,
1.0F-palettePart,
palettePart);
iis.read();
iis.reset();
IndexColorModel cm = new IndexColorModel(8,
256,
palette,
0,
false);
SampleModel sm = cm.createCompatibleSampleModel(thumbWidth,
thumbHeight);
WritableRaster raster =
Raster.createWritableRaster(sm, buffer, null);
return new BufferedImage(cm,
raster,
false,
null);
}
private void readData() throws IOException {
if ( fData != null ) {
return;
}
ImageInputStream input = ( ImageInputStream ) getInput();
long length = input.length();
if ( length > Integer.MAX_VALUE ) {
throw new IOException( "Cannot read image of size " + length );
}
if ( input.getStreamPosition() != 0L ) {
if ( isSeekForwardOnly() ) {
throw new IOException();
}
else {
input.seek( 0 );
}
}
byte[] data;
if ( length > 0 ) {
data = new byte[ ( int ) length ];
input.readFully( data );
}
else {
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] buffer = new byte[ 4096 ];
int bytesRead;
while ( ( bytesRead = input.read( buffer ) ) != -1 ) {
out.write( buffer, 0, bytesRead );
}
out.close();
data = out.toByteArray();
}
fData = data;
}
BufferedImage getThumbnail(ImageInputStream iis,
JPEGImageReader reader)
throws IOException {
iis.mark();
iis.seek(streamPos);
// read the palette
byte [] palette = new byte [PALETTE_SIZE];
float palettePart = ((float) PALETTE_SIZE) / getLength();
readByteBuffer(iis,
palette,
reader,
palettePart,
0.0F);
DataBufferByte buffer = new DataBufferByte(thumbWidth*thumbHeight);
readByteBuffer(iis,
buffer.getData(),
reader,
1.0F-palettePart,
palettePart);
iis.read();
iis.reset();
IndexColorModel cm = new IndexColorModel(8,
256,
palette,
0,
false);
SampleModel sm = cm.createCompatibleSampleModel(thumbWidth,
thumbHeight);
WritableRaster raster =
Raster.createWritableRaster(sm, buffer, null);
return new BufferedImage(cm,
raster,
false,
null);
}
private int getAdobeTransformByBruteForce(ImageInputStream iis) throws IOException
{
int a = 0;
iis.seek(0);
int by;
while ((by = iis.read()) != -1)
{
if (ADOBE.charAt(a) == by)
{
++a;
if (a != ADOBE.length())
{
continue;
}
// match
a = 0;
long afterAdobePos = iis.getStreamPosition();
iis.seek(iis.getStreamPosition() - 9);
int tag = iis.readUnsignedShort();
if (tag != 0xFFEE)
{
iis.seek(afterAdobePos);
continue;
}
int len = iis.readUnsignedShort();
if (len >= POS_TRANSFORM + 1)
{
byte[] app14 = new byte[Math.max(len, POS_TRANSFORM + 1)];
if (iis.read(app14) >= POS_TRANSFORM + 1)
{
return app14[POS_TRANSFORM];
}
}
}
else
{
a = 0;
}
}
return 0;
}
private int getAdobeTransformByBruteForce(ImageInputStream iis) throws IOException
{
int a = 0;
iis.seek(0);
int by;
while ((by = iis.read()) != -1)
{
if (ADOBE.charAt(a) == by)
{
++a;
if (a != ADOBE.length())
{
continue;
}
// match
a = 0;
long afterAdobePos = iis.getStreamPosition();
iis.seek(iis.getStreamPosition() - 9);
int tag = iis.readUnsignedShort();
if (tag != 0xFFEE)
{
iis.seek(afterAdobePos);
continue;
}
int len = iis.readUnsignedShort();
if (len >= POS_TRANSFORM + 1)
{
byte[] app14 = new byte[Math.max(len, POS_TRANSFORM + 1)];
if (iis.read(app14) >= POS_TRANSFORM + 1)
{
return app14[POS_TRANSFORM];
}
}
}
else
{
a = 0;
}
}
return 0;
}