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/*
This file is part of the iText (R) project.
Copyright (c) 1998-2023 Apryse Group NV
Authors: Apryse Software.
This program is offered under a commercial and under the AGPL license.
For commercial licensing, contact us at https://itextpdf.com/sales. For AGPL licensing, see below.
AGPL licensing:
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see .
*/
package com.itextpdf.io.codec;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
import java.util.TreeMap;
/**
* Exports images as TIFF.
*/
public class TiffWriter {
private TreeMap ifd = new TreeMap();
public void addField(FieldBase field) {
ifd.put(Integer.valueOf(field.getTag()), field);
}
public int getIfdSize() {
return 6 + ifd.size() * 12;
}
public void writeFile(OutputStream stream) throws IOException {
stream.write(0x4d);
stream.write(0x4d);
stream.write(0);
stream.write(42);
writeLong(8, stream);
writeShort(ifd.size(), stream);
int offset = 8 + getIfdSize();
for (FieldBase field : ifd.values()) {
int size = field.getValueSize();
if (size > 4) {
field.setOffset(offset);
offset += size;
}
field.writeField(stream);
}
writeLong(0, stream);
for (FieldBase field : ifd.values()) {
field.writeValue(stream);
}
}
/**
* Inner class class containing information about a field.
*/
public abstract static class FieldBase {
private int tag;
private int fieldType;
private int count;
protected byte[] data;
private int offset;
protected FieldBase(int tag, int fieldType, int count) {
this.tag = tag;
this.fieldType = fieldType;
this.count = count;
}
public int getValueSize() {
return (int) ((data.length + 1) & 0xfffffffe);
}
public int getTag() {
return tag;
}
public void setOffset(int offset) {
this.offset = offset;
}
public void writeField(OutputStream stream) throws IOException {
writeShort(tag, stream);
writeShort(fieldType, stream);
writeLong(count, stream);
if (data.length <= 4) {
stream.write(data);
for (int k = data.length; k < 4; ++k) {
stream.write(0);
}
} else {
writeLong(offset, stream);
}
}
public void writeValue(OutputStream stream) throws IOException {
if (data.length <= 4)
return;
stream.write(data);
if ((data.length & 1) == 1)
stream.write(0);
}
}
/**
* Inner class containing info about a field.
*/
public static class FieldShort extends FieldBase {
public FieldShort(int tag, int value) {
super(tag, 3, 1);
data = new byte[2];
data[0] = (byte) (value >> 8);
data[1] = (byte) value;
}
public FieldShort(int tag, int[] values) {
super(tag, 3, values.length);
data = new byte[values.length * 2];
int ptr = 0;
for (int value : values) {
data[ptr++] = (byte) (value >> 8);
data[ptr++] = (byte) value;
}
}
}
/**
* Inner class containing info about a field.
*/
public static class FieldLong extends FieldBase {
public FieldLong(int tag, int value) {
super(tag, 4, 1);
data = new byte[4];
data[0] = (byte) (value >> 24);
data[1] = (byte) (value >> 16);
data[2] = (byte) (value >> 8);
data[3] = (byte) value;
}
public FieldLong(int tag, int[] values) {
super(tag, 4, values.length);
data = new byte[values.length * 4];
int ptr = 0;
for (int value : values) {
data[ptr++] = (byte) (value >> 24);
data[ptr++] = (byte) (value >> 16);
data[ptr++] = (byte) (value >> 8);
data[ptr++] = (byte) value;
}
}
}
/**
* Inner class containing info about a field.
*/
public static class FieldRational extends FieldBase {
public FieldRational(int tag, int[] value) {
this(tag, new int[][]{value});
}
public FieldRational(int tag, int[][] values) {
super(tag, 5, values.length);
data = new byte[values.length * 8];
int ptr = 0;
for (int value[] : values) {
data[ptr++] = (byte) (value[0] >> 24);
data[ptr++] = (byte) (value[0] >> 16);
data[ptr++] = (byte) (value[0] >> 8);
data[ptr++] = (byte) value[0];
data[ptr++] = (byte) (value[1] >> 24);
data[ptr++] = (byte) (value[1] >> 16);
data[ptr++] = (byte) (value[1] >> 8);
data[ptr++] = (byte) value[1];
}
}
}
/**
* Inner class containing info about a field.
*/
public static class FieldByte extends FieldBase {
public FieldByte(int tag, byte[] values) {
super(tag, 1, values.length);
data = values;
}
}
/**
* Inner class containing info about a field.
*/
public static class FieldUndefined extends FieldBase {
public FieldUndefined(int tag, byte[] values) {
super(tag, 7, values.length);
data = values;
}
}
/**
* Inner class containing info about a field.
*/
public static class FieldImage extends FieldBase {
public FieldImage(byte[] values) {
super(TIFFConstants.TIFFTAG_STRIPOFFSETS, 4, 1);
data = values;
}
}
/**
* Inner class containing info about an ASCII field.
*/
public static class FieldAscii extends FieldBase {
public FieldAscii(int tag, String values) {
super(tag, 2, values.getBytes(StandardCharsets.US_ASCII).length + 1);
byte[] b = values.getBytes(StandardCharsets.US_ASCII);
data = new byte[b.length + 1];
System.arraycopy(b, 0, data, 0, b.length);
}
}
public static void writeShort(int v, OutputStream stream) throws IOException {
stream.write((v >> 8) & 0xff);
stream.write(v & 0xff);
}
public static void writeLong(int v, OutputStream stream) throws IOException {
stream.write((v >> 24) & 0xff);
stream.write((v >> 16) & 0xff);
stream.write((v >> 8) & 0xff);
stream.write(v & 0xff);
}
public static void compressLZW(OutputStream stream, int predictor, byte[] b, int height, int samplesPerPixel, int stride) throws IOException {
LZWCompressor lzwCompressor = new LZWCompressor(stream, 8, true);
boolean usePredictor = predictor == TIFFConstants.PREDICTOR_HORIZONTAL_DIFFERENCING;
if (!usePredictor) {
lzwCompressor.compress(b, 0, b.length);
} else {
int off = 0;
byte[] rowBuf = new byte[stride];
for (int i = 0; i < height; i++) {
System.arraycopy(b, off, rowBuf, 0, stride);
for (int j = stride - 1; j >= samplesPerPixel; j--) {
rowBuf[j] -= rowBuf[j - samplesPerPixel];
}
lzwCompressor.compress(rowBuf, 0, stride);
off += stride;
}
}
lzwCompressor.flush();
}
}
