diff options
Diffstat (limited to 'src/main/java/com/lowagie/text/pdf/LZWDecoder.java')
| -rw-r--r-- | src/main/java/com/lowagie/text/pdf/LZWDecoder.java | 231 |
1 files changed, 0 insertions, 231 deletions
diff --git a/src/main/java/com/lowagie/text/pdf/LZWDecoder.java b/src/main/java/com/lowagie/text/pdf/LZWDecoder.java deleted file mode 100644 index b8bedcf..0000000 --- a/src/main/java/com/lowagie/text/pdf/LZWDecoder.java +++ /dev/null @@ -1,231 +0,0 @@ -/*
- * Copyright (c) 2001 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:
- *
- * -Redistributions of source code must retain the above copyright notice, this
- * list of conditions and the following disclaimer.
- *
- * -Redistribution in binary form must reproduct 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 AND ITS LICENSORS SHALL NOT BE
- * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
- * OR DISTRIBUTING THE 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 SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGES.
- *
- * You acknowledge that Software is not designed,licensed or intended for use in
- * the design, construction, operation or maintenance of any nuclear facility.
- *
- * Adapted from the JAI codecs TIFFLZWDecoder.
- */
-package com.lowagie.text.pdf;
-import java.io.OutputStream;
-import java.io.IOException;
-import com.lowagie.text.ExceptionConverter;
-/**
- * A class for performing LZW decoding.
- *
- *
- */
-public class LZWDecoder {
-
- byte stringTable[][];
- byte data[] = null;
- OutputStream uncompData;
- int tableIndex, bitsToGet = 9;
- int bytePointer, bitPointer;
- int nextData = 0;
- int nextBits = 0;
-
- int andTable[] = {
- 511,
- 1023,
- 2047,
- 4095
- };
-
- public LZWDecoder() {
- }
-
- /**
- * Method to decode LZW compressed data.
- *
- * @param data The compressed data.
- * @param uncompData Array to return the uncompressed data in.
- */
- public void decode(byte data[], OutputStream uncompData) {
-
- if(data[0] == (byte)0x00 && data[1] == (byte)0x01) {
- throw new RuntimeException("LZW flavour not supported.");
- }
-
- initializeStringTable();
-
- this.data = data;
- this.uncompData = uncompData;
-
- // Initialize pointers
- bytePointer = 0;
- bitPointer = 0;
-
- nextData = 0;
- nextBits = 0;
-
- int code, oldCode = 0;
- byte string[];
-
- while ((code = getNextCode()) != 257) {
-
- if (code == 256) {
-
- initializeStringTable();
- code = getNextCode();
-
- if (code == 257) {
- break;
- }
-
- writeString(stringTable[code]);
- oldCode = code;
-
- } else {
-
- if (code < tableIndex) {
-
- string = stringTable[code];
-
- writeString(string);
- addStringToTable(stringTable[oldCode], string[0]);
- oldCode = code;
-
- } else {
-
- string = stringTable[oldCode];
- string = composeString(string, string[0]);
- writeString(string);
- addStringToTable(string);
- oldCode = code;
- }
- }
- }
- }
-
-
- /**
- * Initialize the string table.
- */
- public void initializeStringTable() {
-
- stringTable = new byte[8192][];
-
- for (int i=0; i<256; i++) {
- stringTable[i] = new byte[1];
- stringTable[i][0] = (byte)i;
- }
-
- tableIndex = 258;
- bitsToGet = 9;
- }
-
- /**
- * Write out the string just uncompressed.
- */
- public void writeString(byte string[]) {
- try {
- uncompData.write(string);
- }
- catch (IOException e) {
- throw new ExceptionConverter(e);
- }
- }
-
- /**
- * Add a new string to the string table.
- */
- public void addStringToTable(byte oldString[], byte newString) {
- int length = oldString.length;
- byte string[] = new byte[length + 1];
- System.arraycopy(oldString, 0, string, 0, length);
- string[length] = newString;
-
- // Add this new String to the table
- stringTable[tableIndex++] = string;
-
- if (tableIndex == 511) {
- bitsToGet = 10;
- } else if (tableIndex == 1023) {
- bitsToGet = 11;
- } else if (tableIndex == 2047) {
- bitsToGet = 12;
- }
- }
-
- /**
- * Add a new string to the string table.
- */
- public void addStringToTable(byte string[]) {
-
- // Add this new String to the table
- stringTable[tableIndex++] = string;
-
- if (tableIndex == 511) {
- bitsToGet = 10;
- } else if (tableIndex == 1023) {
- bitsToGet = 11;
- } else if (tableIndex == 2047) {
- bitsToGet = 12;
- }
- }
-
- /**
- * Append <code>newString</code> to the end of <code>oldString</code>.
- */
- public byte[] composeString(byte oldString[], byte newString) {
- int length = oldString.length;
- byte string[] = new byte[length + 1];
- System.arraycopy(oldString, 0, string, 0, length);
- string[length] = newString;
-
- return string;
- }
-
- // Returns the next 9, 10, 11 or 12 bits
- public int getNextCode() {
- // Attempt to get the next code. The exception is caught to make
- // this robust to cases wherein the EndOfInformation code has been
- // omitted from a strip. Examples of such cases have been observed
- // in practice.
- try {
- nextData = (nextData << 8) | (data[bytePointer++] & 0xff);
- nextBits += 8;
-
- if (nextBits < bitsToGet) {
- nextData = (nextData << 8) | (data[bytePointer++] & 0xff);
- nextBits += 8;
- }
-
- int code =
- (nextData >> (nextBits - bitsToGet)) & andTable[bitsToGet-9];
- nextBits -= bitsToGet;
-
- return code;
- } catch(ArrayIndexOutOfBoundsException e) {
- // Strip not terminated as expected: return EndOfInformation code.
- return 257;
- }
- }
-}
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