From 6025b6016517c6d898d8957d1d7e03ba71431912 Mon Sep 17 00:00:00 2001 From: tknall Date: Fri, 1 Dec 2006 12:20:24 +0000 Subject: Initial import of release 2.2. git-svn-id: https://joinup.ec.europa.eu/svn/pdf-as/trunk@4 7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c --- .../java/org/pdfbox/filter/ASCIIHexFilter.java | 205 +++++++++++++++++++++ 1 file changed, 205 insertions(+) create mode 100644 src/main/java/org/pdfbox/filter/ASCIIHexFilter.java (limited to 'src/main/java/org/pdfbox/filter/ASCIIHexFilter.java') diff --git a/src/main/java/org/pdfbox/filter/ASCIIHexFilter.java b/src/main/java/org/pdfbox/filter/ASCIIHexFilter.java new file mode 100644 index 0000000..b3cf506 --- /dev/null +++ b/src/main/java/org/pdfbox/filter/ASCIIHexFilter.java @@ -0,0 +1,205 @@ +/** + * Copyright (c) 2003, www.pdfbox.org + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions 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. + * 3. Neither the name of pdfbox; nor the names of its + * contributors may be used to endorse or promote products derived from this + * software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * http://www.pdfbox.org + * + */ +package org.pdfbox.filter; + +import java.io.IOException; +import java.io.InputStream; +import java.io.OutputStream; + +import org.pdfbox.cos.COSDictionary; + +import org.pdfbox.persistence.util.COSHEXTable; + +/** + * This is the used for the ASCIIHexDecode filter. + * + * @author Ben Litchfield (ben@csh.rit.edu) + * @version $Revision: 1.7 $ + */ +public class ASCIIHexFilter implements Filter +{ + private static final int ASCII_ZERO = (int)'0'; + + + /** + * This will decode some compressed data. + * + * @param compressedData The compressed byte stream. + * @param result The place to write the uncompressed byte stream. + * @param options The options to use to encode the data. + * + * @throws IOException If there is an error decompressing the stream. + */ + public void decode( InputStream compressedData, OutputStream result, COSDictionary options ) throws IOException + { + int value =0; + int firstByte = 0; + int secondByte = 0; + while( (firstByte = compressedData.read()) != -1 ) + { + value = REVERSE_HEX[firstByte] * 16; + secondByte = compressedData.read(); + if( secondByte >= 0 ) + { + value += REVERSE_HEX[ secondByte ]; + } + result.write( value ); + } + result.flush(); + } + + private static final int[] REVERSE_HEX = + { + -1, //0 + -1, //1 + -1, //2 + -1, //3 + -1, //4 + -1, //5 + -1, //6 + -1, //7 + -1, //8 + -1, //9 + -1, //10 + -1, //11 + -1, //12 + -1, //13 + -1, //14 + -1, //15 + -1, //16 + -1, //17 + -1, //18 + -1, //19 + -1, //20 + -1, //21 + -1, //22 + -1, //23 + -1, //24 + -1, //25 + -1, //26 + -1, //27 + -1, //28 + -1, //29 + -1, //30 + -1, //31 + -1, //32 + -1, //33 + -1, //34 + -1, //35 + -1, //36 + -1, //37 + -1, //38 + -1, //39 + -1, //40 + -1, //41 + -1, //42 + -1, //43 + -1, //44 + -1, //45 + -1, //46 + -1, //47 + 0, //48 + 1, //49 + 2, //50 + 3, //51 + 4, //52 + 5, //53 + 6, //54 + 7, //55 + 8, //56 + 9, //57 + -1, //58 + -1, //59 + -1, //60 + -1, //61 + -1, //62 + -1, //63 + -1, //64 + 10, //65 + 11, //66 + 12, //67 + 13, //68 + 14, //69 + 15, //70 + -1, //71 + -1, //72 + -1, //73 + -1, //74 + -1, //75 + -1, //76 + -1, //77 + -1, //78 + -1, //79 + -1, //80 + -1, //81 + -1, //82 + -1, //83 + -1, //84 + -1, //85 + -1, //86 + -1, //87 + -1, //88 + -1, //89 + -1, //90 + -1, //91 + -1, //92 + -1, //93 + -1, //94 + -1, //95 + -1, //96 + 10, //97 + 11, //98 + 12, //99 + 13, //100 + 14, //101 + 15, //102 + }; + + /** + * This will encode some data. + * + * @param rawData The raw data to encode. + * @param result The place to write to encoded results to. + * @param options The options to use to encode the data. + * + * @throws IOException If there is an error compressing the stream. + */ + public void encode( InputStream rawData, OutputStream result, COSDictionary options ) throws IOException + { + int byteRead = 0; + while( (byteRead = rawData.read()) != -1 ) + { + int value = (byteRead+256)%256; + result.write( COSHEXTable.TABLE[value] ); + } + result.flush(); + } +} \ No newline at end of file -- cgit v1.2.3