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1
51 package org.apache.fop.pdf;
52
53 import java.io.ByteArrayOutputStream  ;
54 import java.io.IOException ;
55 import java.util.zip.DeflaterOutputStream ;
56
57
64 public class FlateFilter extends PDFFilter {
65
66 public static final int PREDICTION_NONE = 1;
67 public static final int PREDICTION_TIFF2 = 2;
68 public static final int PREDICTION_PNG_NONE = 10;
69 public static final int PREDICTION_PNG_SUB = 11;
70 public static final int PREDICTION_PNG_UP = 12;
71 public static final int PREDICTION_PNG_AVG = 13;
72 public static final int PREDICTION_PNG_PAETH = 14;
73 public static final int PREDICTION_PNG_OPT = 15;
74
75
76 private int _predictor = PREDICTION_NONE;
77 private int _colors;
78 private int _bitsPerComponent;
79 private int _columns;
80
81 public String getName() {
82 return "/FlateDecode";
83 }
84
85 public String getDecodeParms() {
86 if (_predictor > PREDICTION_NONE) {
87 StringBuffer sb = new StringBuffer ();
88 sb.append("<< /Predictor ");
89 sb.append(_predictor);
90 if (_colors > 0) {
91 sb.append(" /Colors " + _colors);
92 }
93 if (_bitsPerComponent > 0) {
94 sb.append(" /BitsPerComponent " + _bitsPerComponent);
95 }
96 if (_columns > 0) {
97 sb.append(" /Columns " + _columns);
98 }
99 sb.append(" >> ");
100 return sb.toString();
101 }
102 return null;
103 }
104
105
106
112 public byte[] encode(byte[] data) {
113 ByteArrayOutputStream outArrayStream = new ByteArrayOutputStream ();
114 _predictor = PREDICTION_NONE;
115 try {
116 DeflaterOutputStream compressedStream =
117 new DeflaterOutputStream (outArrayStream);
118 compressedStream.write(data, 0, data.length);
119 compressedStream.flush();
120 compressedStream.close();
121 } catch (IOException e) {
122 org.apache.fop.messaging.MessageHandler.error("Fatal error: "
123 + e.getMessage());
124 e.printStackTrace();
125 }
126
127 return outArrayStream.toByteArray();
128 }
129
130 public void setPredictor(int predictor) throws PDFFilterException {
131 _predictor = predictor;
132
133 }
134
135 public int getPredictor() {
136 return _predictor;
137 }
138
139
140 public void setColors(int colors) throws PDFFilterException {
141 if (_predictor != PREDICTION_NONE) {
142 _colors = colors;
143 } else {
144 throw new PDFFilterException("Prediction must not be PREDICTION_NONE in order to set Colors");
145 }
146 }
147
148 public int getColors() {
149 return _colors;
150 }
151
152
153 public void setBitsPerComponent(int bits) throws PDFFilterException {
154 if (_predictor != PREDICTION_NONE) {
155 _bitsPerComponent = bits;
156 } else {
157 throw new PDFFilterException("Prediction must not be PREDICTION_NONE in order to set bitsPerComponent");
158 }
159 }
160
161 public int getBitsPerComponent() {
162 return _bitsPerComponent;
163 }
164
165
166 public void setColumns(int columns) throws PDFFilterException {
167 if (_predictor != PREDICTION_NONE) {
168 _columns = columns;
169 } else {
170 throw new PDFFilterException("Prediction must not be PREDICTION_NONE in order to set Columns");
171 }
172 }
173
174 public int getColumns() {
175 return _columns;
176 }
177
178
179 }
180 |
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