001/* 002 * $Id: TiffWriter.java 4784 2011-03-15 08:33:00Z blowagie $ 003 * 004 * This file is part of the iText (R) project. 005 * Copyright (c) 1998-2011 1T3XT BVBA 006 * Authors: Bruno Lowagie, Paulo Soares, et al. 007 * 008 * This program is free software; you can redistribute it and/or modify 009 * it under the terms of the GNU Affero General Public License version 3 010 * as published by the Free Software Foundation with the addition of the 011 * following permission added to Section 15 as permitted in Section 7(a): 012 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT, 013 * 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS. 014 * 015 * This program is distributed in the hope that it will be useful, but 016 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 017 * or FITNESS FOR A PARTICULAR PURPOSE. 018 * See the GNU Affero General Public License for more details. 019 * You should have received a copy of the GNU Affero General Public License 020 * along with this program; if not, see http://www.gnu.org/licenses or write to 021 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 022 * Boston, MA, 02110-1301 USA, or download the license from the following URL: 023 * http://itextpdf.com/terms-of-use/ 024 * 025 * The interactive user interfaces in modified source and object code versions 026 * of this program must display Appropriate Legal Notices, as required under 027 * Section 5 of the GNU Affero General Public License. 028 * 029 * In accordance with Section 7(b) of the GNU Affero General Public License, 030 * a covered work must retain the producer line in every PDF that is created 031 * or manipulated using iText. 032 * 033 * You can be released from the requirements of the license by purchasing 034 * a commercial license. Buying such a license is mandatory as soon as you 035 * develop commercial activities involving the iText software without 036 * disclosing the source code of your own applications. 037 * These activities include: offering paid services to customers as an ASP, 038 * serving PDFs on the fly in a web application, shipping iText with a closed 039 * source product. 040 * 041 * For more information, please contact iText Software Corp. at this 042 * address: sales@itextpdf.com 043 */ 044package com.itextpdf.text.pdf.codec; 045 046import java.io.OutputStream; 047import java.io.IOException; 048import java.util.TreeMap; 049/** 050 * Exports images as TIFF. 051 * @since 5.0.3 052 */ 053public class TiffWriter { 054 private TreeMap<Integer,FieldBase> ifd = new TreeMap<Integer,FieldBase>(); 055 056 public void addField(FieldBase field) { 057 ifd.put(Integer.valueOf(field.getTag()), field); 058 } 059 060 public int getIfdSize() { 061 return 6 + ifd.size() * 12; 062 } 063 064 public void writeFile(OutputStream stream) throws IOException { 065 stream.write(0x4d); 066 stream.write(0x4d); 067 stream.write(0); 068 stream.write(42); 069 writeLong(8, stream); 070 writeShort(ifd.size(), stream); 071 int offset = 8 + getIfdSize(); 072 for (FieldBase field : ifd.values()) { 073 int size = field.getValueSize(); 074 if (size > 4) { 075 field.setOffset(offset); 076 offset += size; 077 } 078 field.writeField(stream); 079 } 080 writeLong(0, stream); 081 for (FieldBase field : ifd.values()) { 082 field.writeValue(stream); 083 } 084 } 085 086 /** 087 * Inner class class containing information about a field. 088 * @since 5.0.3 089 */ 090 public abstract static class FieldBase { 091 private int tag; 092 private int fieldType; 093 private int count; 094 protected byte[] data; 095 private int offset; 096 097 protected FieldBase(int tag, int fieldType, int count) { 098 this.tag = tag; 099 this.fieldType = fieldType; 100 this.count = count; 101 } 102 103 public int getValueSize() { 104 return (data.length + 1) & 0xfffffffe; 105 } 106 107 public int getTag() { 108 return tag; 109 } 110 111 public void setOffset(int offset) { 112 this.offset = offset; 113 } 114 115 public void writeField(OutputStream stream) throws IOException { 116 writeShort(tag, stream); 117 writeShort(fieldType, stream); 118 writeLong(count, stream); 119 if (data.length <= 4) { 120 stream.write(data); 121 for (int k = data.length; k < 4; ++k) { 122 stream.write(0); 123 } 124 } 125 else { 126 writeLong(offset, stream); 127 } 128 } 129 130 public void writeValue(OutputStream stream) throws IOException { 131 if (data.length <= 4) 132 return; 133 stream.write(data); 134 if ((data.length & 1) == 1) 135 stream.write(0); 136 } 137 } 138 139 /** 140 * Inner class containing info about a field. 141 * @since 5.0.3 142 */ 143 public static class FieldShort extends FieldBase { 144 public FieldShort(int tag, int value) { 145 super(tag, 3, 1); 146 data = new byte[2]; 147 data[0] = (byte)(value >> 8); 148 data[1] = (byte)value; 149 } 150 151 public FieldShort(int tag, int[] values) { 152 super(tag, 3, values.length); 153 data = new byte[values.length * 2]; 154 int ptr = 0; 155 for (int value : values) { 156 data[ptr++] = (byte)(value >> 8); 157 data[ptr++] = (byte)value; 158 } 159 } 160 } 161 162 /** 163 * Inner class containing info about a field. 164 * @since 5.0.3 165 */ 166 public static class FieldLong extends FieldBase { 167 public FieldLong(int tag, int value) { 168 super(tag, 4, 1); 169 data = new byte[4]; 170 data[0] = (byte)(value >> 24); 171 data[1] = (byte)(value >> 16); 172 data[2] = (byte)(value >> 8); 173 data[3] = (byte)value; 174 } 175 176 public FieldLong(int tag, int[] values) { 177 super(tag, 4, values.length); 178 data = new byte[values.length * 4]; 179 int ptr = 0; 180 for (int value : values) { 181 data[ptr++] = (byte)(value >> 24); 182 data[ptr++] = (byte)(value >> 16); 183 data[ptr++] = (byte)(value >> 8); 184 data[ptr++] = (byte)value; 185 } 186 } 187 } 188 189 /** 190 * Inner class containing info about a field. 191 * @since 5.0.3 192 */ 193 public static class FieldRational extends FieldBase { 194 public FieldRational(int tag, int[] value) { 195 this(tag, new int[][]{value}); 196 } 197 198 public FieldRational(int tag, int[][] values) { 199 super(tag, 5, values.length); 200 data = new byte[values.length * 8]; 201 int ptr = 0; 202 for (int value[] : values) { 203 data[ptr++] = (byte)(value[0] >> 24); 204 data[ptr++] = (byte)(value[0] >> 16); 205 data[ptr++] = (byte)(value[0] >> 8); 206 data[ptr++] = (byte)value[0]; 207 data[ptr++] = (byte)(value[1] >> 24); 208 data[ptr++] = (byte)(value[1] >> 16); 209 data[ptr++] = (byte)(value[1] >> 8); 210 data[ptr++] = (byte)value[1]; 211 } 212 } 213 } 214 215 /** 216 * Inner class containing info about a field. 217 * @since 5.0.3 218 */ 219 public static class FieldByte extends FieldBase { 220 public FieldByte(int tag, byte[] values) { 221 super(tag, 1, values.length); 222 data = values; 223 } 224 } 225 226 /** 227 * Inner class containing info about a field. 228 * @since 5.0.3 229 */ 230 public static class FieldUndefined extends FieldBase { 231 public FieldUndefined(int tag, byte[] values) { 232 super(tag, 7, values.length); 233 data = values; 234 } 235 } 236 237 /** 238 * Inner class containing info about a field. 239 * @since 5.0.3 240 */ 241 public static class FieldImage extends FieldBase { 242 public FieldImage(byte[] values) { 243 super(TIFFConstants.TIFFTAG_STRIPOFFSETS, 4, 1); 244 data = values; 245 } 246 } 247 248 /** 249 * Inner class containing info about an ASCII field. 250 * @since 5.0.3 251 */ 252 public static class FieldAscii extends FieldBase { 253 public FieldAscii(int tag, String values) { 254 super(tag, 2, values.getBytes().length + 1); 255 byte[] b = values.getBytes(); 256 data = new byte[b.length + 1]; 257 System.arraycopy(b, 0, data, 0, b.length); 258 } 259 } 260 261 public static void writeShort(int v, OutputStream stream) throws IOException { 262 stream.write((v >> 8) & 0xff); 263 stream.write(v & 0xff); 264 } 265 266 public static void writeLong(int v, OutputStream stream) throws IOException { 267 stream.write((v >> 24) & 0xff); 268 stream.write((v >> 16) & 0xff); 269 stream.write((v >> 8) & 0xff); 270 stream.write(v & 0xff); 271 } 272 273 public static void compressLZW(OutputStream stream, int predictor, byte[] b, int height, int samplesPerPixel, int stride) throws IOException { 274 275 LZWCompressor lzwCompressor = new LZWCompressor(stream, 8, true); 276 boolean usePredictor = predictor == TIFFConstants.PREDICTOR_HORIZONTAL_DIFFERENCING; 277 278 if (!usePredictor) { 279 lzwCompressor.compress(b, 0, b.length); 280 } else { 281 int off = 0; 282 byte[] rowBuf = usePredictor ? new byte[stride] : null; 283 for (int i = 0; i < height; i++) { 284 System.arraycopy(b, off, rowBuf, 0, stride); 285 for (int j = stride - 1; j >= samplesPerPixel; j--) { 286 rowBuf[j] -= rowBuf[j - samplesPerPixel]; 287 } 288 lzwCompressor.compress(rowBuf, 0, stride); 289 off += stride; 290 } 291 } 292 293 lzwCompressor.flush(); 294 } 295}