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* Copyright (c) 2005, www.pdfbox.org
* All rights reserved.
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package org.pdfbox.pdmodel.graphics.xobject;
import java.awt.image.BufferedImage;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.RandomAccessFile;
import java.util.ArrayList;
import java.util.List;
import javax.imageio.ImageIO;
import org.pdfbox.cos.COSDictionary;
import org.pdfbox.cos.COSName;
import org.pdfbox.pdmodel.PDDocument;
import org.pdfbox.pdmodel.common.PDStream;
import org.pdfbox.pdmodel.graphics.color.PDDeviceGray;
/**
* An image class for CCITT Fax.
*
* @author paul king
* @version $Revision: 1.2 $
*/
public class PDCcitt extends PDXObjectImage
{
private static final List FAX_FILTERS = new ArrayList();
static
{
FAX_FILTERS.add( COSName.CCITTFAX_DECODE.getName() );
FAX_FILTERS.add( COSName.CCITTFAX_DECODE_ABBREVIATION.getName() );
}
/**
* Standard constructor.
*
* @param ccitt The PDStream that already contains all ccitt information.
*/
public PDCcitt(PDStream ccitt)
{
super(ccitt, "tiff");
}
/**
* Construct from a tiff file.
*
* @param doc The document to create the image as part of.
* @param raf The random access TIFF file which contains a suitable CCITT compressed image
* @throws IOException If there is an error reading the tiff data.
*/
public PDCcitt( PDDocument doc, java.io.RandomAccessFile raf ) throws IOException
{
super( new PDStream(doc),"tiff");
// super( new PDStream( doc, null, true ), "tiff" );
COSDictionary decodeParms = new COSDictionary();
COSDictionary dic = getCOSStream();
extractFromTiff(raf, getCOSStream().createFilteredStream(),decodeParms);
dic.setItem( COSName.FILTER, COSName.CCITTFAX_DECODE);
dic.setItem( COSName.SUBTYPE, COSName.IMAGE);
dic.setItem( COSName.TYPE, COSName.getPDFName( "XObject" ) );
dic.setItem( "DecodeParms", decodeParms);
setBitsPerComponent( 1 );
setColorSpace( new PDDeviceGray() );
setWidth( decodeParms.getInt("Columns") );
setHeight( decodeParms.getInt("Rows") );
}
/**
* Returns an image of the CCITT Fax, or null if TIFFs are not supported. (Requires additional JAI Image filters )
* @see org.pdfbox.pdmodel.graphics.xobject.PDXObjectImage#getRGBImage()
*/
public BufferedImage getRGBImage() throws IOException
{
// ImageIO.scanForPlugins();
return ImageIO.read(new TiffWrapper(getPDStream().getPartiallyFilteredStream( FAX_FILTERS ),getCOSStream()));
}
/**
* This writes a tiff to out.
* @see org.pdfbox.pdmodel.graphics.xobject.PDXObjectImage#write2OutputStream(java.io.OutputStream)
*/
public void write2OutputStream(OutputStream out) throws IOException
{
InputStream data = new TiffWrapper(getPDStream().getPartiallyFilteredStream( FAX_FILTERS ),getCOSStream());
byte[] buf = new byte[1024];
int amountRead = -1;
while( (amountRead = data.read( buf )) != -1 )
{
out.write( buf, 0, amountRead );
}
}
/**
* Extract the ccitt stream from the tiff file.
*
* @param raf - TIFF File
* @param os - Stream to write raw ccitt data two
* @param parms - COSDictionary which the encoding parameters are added to
* @throws IOException If there is an error reading/writing to/from the stream
*/
private void extractFromTiff(RandomAccessFile raf, OutputStream os, COSDictionary parms) throws IOException
{
try
{
// First check the basic tiff header
raf.seek(0);
char endianess = (char) raf.read();
if ((char) raf.read() != endianess)
{
throw new IOException("Not a valid tiff file");
}
//ensure that endianess is either M or I
if (endianess != 'M' && endianess != 'I')
{
throw new IOException("Not a valid tiff file");
}
int magicNumber = readshort(endianess, raf);
if( magicNumber != 42)
{
throw new IOException("Not a valid tiff file");
}
// Relocate to the first set of tags
raf.seek(readlong(endianess, raf));
int numtags = readshort(endianess, raf);
// The number 50 is somewhat arbitary, it just stops us load up junk from somewhere and tramping on
if (numtags > 50)
{
throw new IOException("Not a valid tiff file");
}
// Loop through the tags, some will convert to items in the parms dictionary
// Other point us to where to find the data stream
// The only parm which might change as a result of other options is K, so
// We'll deal with that as a special;
int k=-1000; // Default Non CCITT compression
int dataoffset=0;
int datalength=0;
for (int i=0; i < numtags; i++)
{
int tag = readshort(endianess, raf);
int type = readshort(endianess, raf);
int count = readlong(endianess, raf);
int val = readlong(endianess, raf); // See note
// Note, we treated that value as a long. The value always occupies 4 bytes
// But it might only use the first byte or two. Depending on endianess we might need to correct
// Note we ignore all other types, they are of little interest for PDFs/CCITT Fax
if (endianess == 'M')
{
switch (type)
{
case 1:
{
val = val >> 24;
break; // byte value
}
case 3:
{
val = val >> 16;
break; // short value
}
case 4:
{
break; // long value
}
default:
{
//do nothing
}
}
}
switch (tag)
{
case 256:
{
parms.setInt("Columns",val);
break;
}
case 257:
{
parms.setInt("Rows",val);
break;
}
case 259:
{
if (val == 4)
{
k=-1;
}
if (val == 3)
{
k=0;
}
break; // T6/T4 Compression
}
case 262:
{
if (val == 1)
{
parms.setBoolean("BlackIs1", true);
}
break;
}
case 273:
{
if (count == 1)
{
dataoffset=val;
}
break;
}
case 279:
{
if (count == 1)
{
datalength=val;
}
break;
}
case 292:
{
if (val == 1)
{
k=50; // T4 2D - arbitary K value
}
break;
}
case 324:
{
if (count == 1)
{
dataoffset=val;
}
break;
}
case 325:
{
if (count == 1)
{
datalength=val;
}
break;
}
default:
{
//do nothing
}
}
}
if (k == -1000)
{
throw new IOException("First image in tiff is not CCITT T4 or T6 compressed");
}
if (dataoffset == 0)
{
throw new IOException("First image in tiff is not a single tile/strip");
}
parms.setInt("K",k);
raf.seek(dataoffset);
byte[] buf = new byte[8192];
int amountRead = -1;
while( (amountRead = raf.read( buf,0, Math.min(8192,datalength) )) > 0 )
{
datalength -= amountRead;
os.write( buf, 0, amountRead );
}
}
finally
{
os.close();
}
}
private int readshort(char endianess, RandomAccessFile raf) throws IOException
{
if (endianess == 'I')
{
return raf.read() | (raf.read() << 8);
}
return (raf.read() << 8) | raf.read();
}
private int readlong(char endianess, RandomAccessFile raf) throws IOException
{
if (endianess == 'I')
{
return raf.read() | (raf.read() << 8) | (raf.read() << 16) | (raf.read() << 24);
}
return (raf.read() << 24) | (raf.read() << 16) | (raf.read() << 8) | raf.read();
}
/**
* Extends InputStream to wrap the data from the CCITT Fax with a suitable TIFF Header.
* For details see www.tiff.org, which contains useful information including pointers to the
* TIFF 6.0 Specification
*
*/
private class TiffWrapper extends InputStream
{
private int currentOffset; // When reading, where in the tiffheader are we.
private byte[] tiffheader; // Byte array to store tiff header data
private InputStream datastream; // Original InputStream
public TiffWrapper(InputStream rawstream, COSDictionary options)
{
buildHeader(options);
currentOffset=0;
datastream = rawstream;
}
// Implement basic methods from InputStream
public boolean markSupported()
{
return false;
}
public void reset() throws IOException
{
throw new IOException("reset not supported");
}
// For simple read, take a byte from the tiffheader array or pass through.
public int read() throws IOException
{
if (currentOffset < tiffheader.length)
{
return tiffheader[currentOffset++];
}
return datastream.read();
}
// For read methods only return as many bytes as we have left in the header
// if we've exhausted the header, pass through to the InputStream of the raw CCITT data
public int read(byte[] data) throws IOException
{
if (currentOffset < tiffheader.length)
{
int length = java.lang.Math.min(tiffheader.length - currentOffset, data.length);
if (length > 0)
{
System.arraycopy(tiffheader, currentOffset, data, 0, length);
}
currentOffset += length;
return length;
}
else
{
return datastream.read(data);
}
}
// For read methods only return as many bytes as we have left in the header
// if we've exhausted the header, pass through to the InputStream of the raw CCITT data
public int read(byte[] data, int off, int len) throws IOException
{
if (currentOffset < tiffheader.length)
{
int length = java.lang.Math.min(tiffheader.length - currentOffset, len);
if (length > 0)
{
System.arraycopy(tiffheader, currentOffset, data, off, length);
}
currentOffset += length;
return length;
}
else
{
return datastream.read(data,off,len);
}
}
// When skipping if any header data not yet read, only allow to skip what we've in the buffer
// Otherwise just pass through.
public long skip(long n) throws IOException
{
if (currentOffset < tiffheader.length)
{
long length = Math.min(tiffheader.length - currentOffset, n);
currentOffset += length;
return length;
}
else
{
return datastream.skip(n);
}
}
// Static data for the beginning of the TIFF header
private final byte[] basicHeader = {
'I','I',42,0,8,0,0,0, // File introducer and pointer to first IFD
0,0}; // Number of tags start with two
private int additionalOffset; // Offset in header to additional data
// Builds up the tiffheader based on the options passed through.
private void buildHeader(COSDictionary options)
{
final int numOfTags = 10; // The maximum tags we'll fill
final int maxAdditionalData = 24; // The maximum amount of additional data
// outside the IFDs. (bytes)
// The length of the header will be the length of the basic header (10)
// plus 12 bytes for each IFD, 4 bytes as a pointer to the next IFD (will be 0)
// plus the length of the additional data
tiffheader = new byte[10 + (12 * numOfTags ) + 4 + maxAdditionalData];
java.util.Arrays.fill(tiffheader,(byte)0);
System.arraycopy(basicHeader,0,tiffheader,0,basicHeader.length);
// Additional data outside the IFD starts after the IFD's and pointer to the next IFD (0)
additionalOffset = 10 + (12 * numOfTags ) + 4;
// Now work out the variable values from TIFF defaults,
// PDF Defaults and the Dictionary for this XObject
short cols = 1728;
short rows = 0;
short blackis1 = 0;
short comptype = 3; // T4 compression
long t4options = 0; // Will set if 1d or 2d T4
COSDictionary decodeParms = (COSDictionary) options.getDictionaryObject("DecodeParms");
if (decodeParms != null)
{
cols = (short) decodeParms.getInt("Columns", cols);
rows = (short) decodeParms.getInt("Rows", rows);
if (decodeParms.getBoolean("BlackIs1", false))
{
blackis1 = 1;
}
int k = decodeParms.getInt("K"); // Mandatory parm
if (k < 0)
{
//T6
comptype = 4;
}
if (k > 0)
{
//T4 2D
comptype = 3;
t4options = 1;
}
// else k = 0, leave as default T4 1D compression
}
// If we couldn't get the number of rows, use the main item from XObject
if (rows == 0)
{
rows = (short) options.getInt("Height", rows);
}
// Now put the tags into the tiffheader
// These musn't exceed the maximum set above, and by TIFF spec should be sorted into
// Numeric sequence.
addTag(256, cols); // Columns
addTag(257, rows); // Rows
addTag(259, comptype); // T6
addTag(262, blackis1); // Photometric Interpretation
addTag(273, (long) tiffheader.length); // Offset to start of image data - updated below
addTag(279, (long) options.getInt("Length")); // Length of image data
addTag(282, 300, 1); // X Resolution 300 (default unit Inches) This is arbitary
addTag(283, 300, 1); // Y Resolution 300 (default unit Inches) This is arbitary
if (comptype == 3)
{
addTag(292, t4options);
}
addTag(305, "PDFBOX"); // Software generating image
}
/* Tiff types 1 = byte, 2=ascii, 3=short, 4=ulong 5=rational */
private void addTag(int tag,long value)
{
// Adds a tag of type 4 (ulong)
int count = ++tiffheader[8];
int offset = (count-1)*12 + 10;
tiffheader[offset]=(byte)(tag & 0xff);
tiffheader[offset+1]=(byte)((tag>>8) & 0xff);
tiffheader[offset+2]=4; // Type Long
tiffheader[offset+4]=1; // One Value
tiffheader[offset+8]=(byte)(value & 0xff);
tiffheader[offset+9]=(byte)((value>>8) & 0xff);
tiffheader[offset+10]=(byte)((value>>16) & 0xff);
tiffheader[offset+11]=(byte)((value>>24) & 0xff);
}
private void addTag(int tag, short value)
{
// Adds a tag of type 3 (short)
int count = ++tiffheader[8];
int offset = (count-1)*12 + 10;
tiffheader[offset]=(byte)(tag & 0xff);
tiffheader[offset+1]=(byte)((tag>>8) & 0xff);
tiffheader[offset+2]=3; // Type Short
tiffheader[offset+4]=1; // One Value
tiffheader[offset+8]=(byte)(value & 0xff);
tiffheader[offset+9]=(byte)((value>>8) & 0xff);
}
private void addTag(int tag, String value)
{
// Adds a tag of type 2 (ascii)
int count = ++tiffheader[8];
int offset = (count-1)*12 + 10;
tiffheader[offset]=(byte)(tag & 0xff);
tiffheader[offset+1]=(byte)((tag>>8) & 0xff);
tiffheader[offset+2]=2; // Type Ascii
tiffheader[offset+4]=1; // One Value
tiffheader[offset+8]=(byte)(additionalOffset & 0xff);
tiffheader[offset+9]=(byte)((additionalOffset>>8) & 0xff);
tiffheader[offset+10]=(byte)((additionalOffset>>16) & 0xff);
tiffheader[offset+11]=(byte)((additionalOffset>>24) & 0xff);
System.arraycopy(value.getBytes(), 0, tiffheader, additionalOffset, value.length());
additionalOffset += value.length() + 1;
}
private void addTag(int tag, long numerator, long denominator)
{
// Adds a tag of type 5 (rational)
int count = ++tiffheader[8];
int offset = (count-1)*12 + 10;
tiffheader[offset]=(byte)(tag & 0xff);
tiffheader[offset+1]=(byte)((tag>>8) & 0xff);
tiffheader[offset+2]=5; // Type Rational
tiffheader[offset+4]=1; // One Value
tiffheader[offset+8]=(byte)(additionalOffset & 0xff);
tiffheader[offset+9]=(byte)((additionalOffset>>8) & 0xff);
tiffheader[offset+10]=(byte)((additionalOffset>>16) & 0xff);
tiffheader[offset+11]=(byte)((additionalOffset>>24) & 0xff);
tiffheader[additionalOffset++]=(byte) ((numerator) & 0xFF);
tiffheader[additionalOffset++]=(byte) ((numerator>>8) & 0xFF);
tiffheader[additionalOffset++]=(byte) ((numerator>>16) & 0xFF);
tiffheader[additionalOffset++]=(byte) ((numerator>>24) & 0xFF);
tiffheader[additionalOffset++]=(byte) ((denominator) & 0xFF);
tiffheader[additionalOffset++]=(byte) ((denominator>>8) & 0xFF);
tiffheader[additionalOffset++]=(byte) ((denominator>>16) & 0xFF);
tiffheader[additionalOffset++]=(byte) ((denominator>>24) & 0xFF);
}
}
}