1 files changed, 205 insertions, 0 deletions
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