com.aowagie.text.pdf.codec.TIFFField Maven / Gradle / Ivy
/*
* Copyright 2003-2008 by Paulo Soares.
*
* This code was originally released in 2001 by SUN (see class
* com.sun.media.imageio.plugins.tiff.TIFFField.java)
* using the BSD license in a specific wording. In a mail dating from
* January 23, 2008, Brian Burkhalter (@sun.com) gave us permission
* to use the code under the following version of the BSD license:
*
* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any
* kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
* WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
* EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
* NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
* USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
* ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
* CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
* REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
* INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for
* use in the design, construction, operation or maintenance of any
* nuclear facility.
*/
package com.aowagie.text.pdf.codec;
import java.io.Serializable;
/**
* A class representing a field in a TIFF 6.0 Image File Directory.
*
* The TIFF file format is described in more detail in the
* comments for the TIFFDescriptor class.
*
*
A field in a TIFF Image File Directory (IFD). A field is defined
* as a sequence of values of identical data type. TIFF 6.0 defines
* 12 data types, which are mapped internally onto the Java data types
* byte, int, long, float, and double.
*
*
This class is not a committed part of the JAI API. It may
* be removed or changed in future releases of JAI.
*
* @see TIFFDirectory
*/
class TIFFField extends Object implements Comparable, Serializable {
private static final long serialVersionUID = 9088332901412823834L;
/** Flag for 8 bit unsigned integers. */
static final int TIFF_BYTE = 1;
/** Flag for null-terminated ASCII strings. */
static final int TIFF_ASCII = 2;
/** Flag for 16 bit unsigned integers. */
static final int TIFF_SHORT = 3;
/** Flag for 32 bit unsigned integers. */
static final int TIFF_LONG = 4;
/** Flag for pairs of 32 bit unsigned integers. */
static final int TIFF_RATIONAL = 5;
/** Flag for 8 bit signed integers. */
static final int TIFF_SBYTE = 6;
/** Flag for 8 bit uninterpreted bytes. */
static final int TIFF_UNDEFINED = 7;
/** Flag for 16 bit signed integers. */
static final int TIFF_SSHORT = 8;
/** Flag for 32 bit signed integers. */
static final int TIFF_SLONG = 9;
/** Flag for pairs of 32 bit signed integers. */
static final int TIFF_SRATIONAL = 10;
/** Flag for 32 bit IEEE floats. */
static final int TIFF_FLOAT = 11;
/** Flag for 64 bit IEEE doubles. */
static final int TIFF_DOUBLE = 12;
/** The tag number. */
private int tag;
/** The tag type. */
private int type;
/** The number of data items present in the field. */
private int count;
/** The field data. */
private Object data;
/** The default constructor. */
TIFFField() {}
/**
* Constructs a TIFFField with arbitrary data. The data
* parameter must be an array of a Java type appropriate for the
* type of the TIFF field. Since there is no available 32-bit
* unsigned data type, long is used. The mapping between types is
* as follows:
*
*
*
* TIFF type Java type
*
* TIFF_BYTE byte
*
* TIFF_ASCII String
*
* TIFF_SHORT char
*
* TIFF_LONG long
*
* TIFF_RATIONAL long[2]
*
* TIFF_SBYTE byte
*
* TIFF_UNDEFINED byte
*
* TIFF_SSHORT short
*
* TIFF_SLONG int
*
* TIFF_SRATIONAL int[2]
*
* TIFF_FLOAT float
*
* TIFF_DOUBLE double
*
*/
TIFFField(final int tag, final int type, final int count, final Object data) {
this.tag = tag;
this.type = type;
this.count = count;
this.data = data;
}
/**
* Returns the tag number, between 0 and 65535.
*/
public int getTag() {
return this.tag;
}
/**
* Returns the type of the data stored in the IFD.
* For a TIFF6.0 file, the value will equal one of the
* TIFF_ constants defined in this class. For future
* revisions of TIFF, higher values are possible.
*
*/
public int getType() {
return this.type;
}
/**
* Returns the number of elements in the IFD.
*/
public int getCount() {
return this.count;
}
/**
* Returns the data as an uninterpreted array of bytes.
* The type of the field must be one of TIFF_BYTE, TIFF_SBYTE,
* or TIFF_UNDEFINED;
*
* For data in TIFF_BYTE format, the application must take
* care when promoting the data to longer integral types
* to avoid sign extension.
*
*
A ClassCastException will be thrown if the field is not
* of type TIFF_BYTE, TIFF_SBYTE, or TIFF_UNDEFINED.
*/
public byte[] getAsBytes() {
return (byte[])this.data;
}
/**
* Returns TIFF_SHORT data as an array of chars (unsigned 16-bit
* integers).
*
*
A ClassCastException will be thrown if the field is not
* of type TIFF_SHORT.
*/
public char[] getAsChars() {
return (char[])this.data;
}
/**
* Returns TIFF_SSHORT data as an array of shorts (signed 16-bit
* integers).
*
*
A ClassCastException will be thrown if the field is not
* of type TIFF_SSHORT.
*/
public short[] getAsShorts() {
return (short[])this.data;
}
/**
* Returns TIFF_SLONG data as an array of ints (signed 32-bit
* integers).
*
*
A ClassCastException will be thrown if the field is not
* of type TIFF_SLONG.
*/
public int[] getAsInts() {
return (int[])this.data;
}
/**
* Returns TIFF_LONG data as an array of longs (signed 64-bit
* integers).
*
*
A ClassCastException will be thrown if the field is not
* of type TIFF_LONG.
*/
public long[] getAsLongs() {
return (long[])this.data;
}
/**
* Returns TIFF_FLOAT data as an array of floats.
*
*
A ClassCastException will be thrown if the field is not
* of type TIFF_FLOAT.
*/
public float[] getAsFloats() {
return (float[])this.data;
}
/**
* Returns TIFF_DOUBLE data as an array of doubles.
*
*
A ClassCastException will be thrown if the field is not
* of type TIFF_DOUBLE.
*/
public double[] getAsDoubles() {
return (double[])this.data;
}
/**
* Returns TIFF_SRATIONAL data as an array of 2-element arrays of ints.
*
*
A ClassCastException will be thrown if the field is not
* of type TIFF_SRATIONAL.
*/
public int[][] getAsSRationals() {
return (int[][])this.data;
}
/**
* Returns TIFF_RATIONAL data as an array of 2-element arrays of longs.
*
*
A ClassCastException will be thrown if the field is not
* of type TIFF_RATTIONAL.
*/
public long[][] getAsRationals() {
return (long[][])this.data;
}
/**
* Returns data in TIFF_BYTE, TIFF_SBYTE, TIFF_UNDEFINED, TIFF_SHORT,
* TIFF_SSHORT, or TIFF_SLONG format as an int.
*
*
TIFF_BYTE and TIFF_UNDEFINED data are treated as unsigned;
* that is, no sign extension will take place and the returned
* value will be in the range [0, 255]. TIFF_SBYTE data will
* be returned in the range [-128, 127].
*
*
A ClassCastException will be thrown if the field is not of
* type TIFF_BYTE, TIFF_SBYTE, TIFF_UNDEFINED, TIFF_SHORT,
* TIFF_SSHORT, or TIFF_SLONG.
*/
int getAsInt(final int index) {
switch (this.type) {
case TIFF_BYTE: case TIFF_UNDEFINED:
return ((byte[])this.data)[index] & 0xff;
case TIFF_SBYTE:
return ((byte[])this.data)[index];
case TIFF_SHORT:
return ((char[])this.data)[index] & 0xffff;
case TIFF_SSHORT:
return ((short[])this.data)[index];
case TIFF_SLONG:
return ((int[])this.data)[index];
default:
throw new ClassCastException();
}
}
/**
* Returns data in TIFF_BYTE, TIFF_SBYTE, TIFF_UNDEFINED, TIFF_SHORT,
* TIFF_SSHORT, TIFF_SLONG, or TIFF_LONG format as a long.
*
*
TIFF_BYTE and TIFF_UNDEFINED data are treated as unsigned;
* that is, no sign extension will take place and the returned
* value will be in the range [0, 255]. TIFF_SBYTE data will
* be returned in the range [-128, 127].
*
*
A ClassCastException will be thrown if the field is not of
* type TIFF_BYTE, TIFF_SBYTE, TIFF_UNDEFINED, TIFF_SHORT,
* TIFF_SSHORT, TIFF_SLONG, or TIFF_LONG.
*/
long getAsLong(final int index) {
switch (this.type) {
case TIFF_BYTE: case TIFF_UNDEFINED:
return ((byte[])this.data)[index] & 0xff;
case TIFF_SBYTE:
return ((byte[])this.data)[index];
case TIFF_SHORT:
return ((char[])this.data)[index] & 0xffff;
case TIFF_SSHORT:
return ((short[])this.data)[index];
case TIFF_SLONG:
return ((int[])this.data)[index];
case TIFF_LONG:
return ((long[])this.data)[index];
default:
throw new ClassCastException();
}
}
/**
* Returns data in any numerical format as a float. Data in
* TIFF_SRATIONAL or TIFF_RATIONAL format are evaluated by
* dividing the numerator into the denominator using
* double-precision arithmetic and then truncating to single
* precision. Data in TIFF_SLONG, TIFF_LONG, or TIFF_DOUBLE
* format may suffer from truncation.
*
*
A ClassCastException will be thrown if the field is
* of type TIFF_UNDEFINED or TIFF_ASCII.
*/
float getAsFloat(final int index) {
switch (this.type) {
case TIFF_BYTE:
return ((byte[])this.data)[index] & 0xff;
case TIFF_SBYTE:
return ((byte[])this.data)[index];
case TIFF_SHORT:
return ((char[])this.data)[index] & 0xffff;
case TIFF_SSHORT:
return ((short[])this.data)[index];
case TIFF_SLONG:
return ((int[])this.data)[index];
case TIFF_LONG:
return ((long[])this.data)[index];
case TIFF_FLOAT:
return ((float[])this.data)[index];
case TIFF_DOUBLE:
return (float)((double[])this.data)[index];
case TIFF_SRATIONAL:
final int[] ivalue = getAsSRational(index);
return (float)((double)ivalue[0]/ivalue[1]);
case TIFF_RATIONAL:
final long[] lvalue = getAsRational(index);
return (float)((double)lvalue[0]/lvalue[1]);
default:
throw new ClassCastException();
}
}
/**
* Returns data in any numerical format as a float. Data in
* TIFF_SRATIONAL or TIFF_RATIONAL format are evaluated by
* dividing the numerator into the denominator using
* double-precision arithmetic.
*
*
A ClassCastException will be thrown if the field is of
* type TIFF_UNDEFINED or TIFF_ASCII.
*/
double getAsDouble(final int index) {
switch (this.type) {
case TIFF_BYTE:
return ((byte[])this.data)[index] & 0xff;
case TIFF_SBYTE:
return ((byte[])this.data)[index];
case TIFF_SHORT:
return ((char[])this.data)[index] & 0xffff;
case TIFF_SSHORT:
return ((short[])this.data)[index];
case TIFF_SLONG:
return ((int[])this.data)[index];
case TIFF_LONG:
return ((long[])this.data)[index];
case TIFF_FLOAT:
return ((float[])this.data)[index];
case TIFF_DOUBLE:
return ((double[])this.data)[index];
case TIFF_SRATIONAL:
final int[] ivalue = getAsSRational(index);
return (double)ivalue[0]/ivalue[1];
case TIFF_RATIONAL:
final long[] lvalue = getAsRational(index);
return (double)lvalue[0]/lvalue[1];
default:
throw new ClassCastException();
}
}
/**
* Returns a TIFF_SRATIONAL data item as a two-element array
* of ints.
*
*
A ClassCastException will be thrown if the field is not
* of type TIFF_SRATIONAL.
*/
private int[] getAsSRational(final int index) {
return ((int[][])this.data)[index];
}
/**
* Returns a TIFF_RATIONAL data item as a two-element array
* of ints.
*
*
A ClassCastException will be thrown if the field is not
* of type TIFF_RATIONAL.
*/
long[] getAsRational(final int index) {
if (this.type == TIFF_LONG) {
return getAsLongs();
}
return ((long[][])this.data)[index];
}
/**
* Compares this TIFFField with another
* TIFFField by comparing the tags.
*
*
Note: this class has a natural ordering that is inconsistent
* with equals().
*
* @throws IllegalArgumentException if the parameter is null.
* @throws ClassCastException if the parameter is not a
* TIFFField.
*/
@Override
public int compareTo(final Object o) {
if(o == null) {
throw new IllegalArgumentException();
}
final int oTag = ((TIFFField)o).getTag();
if(this.tag < oTag) {
return -1;
} else if(this.tag > oTag) {
return 1;
} else {
return 0;
}
}
}