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52 package com.lowagie.text.pdf;
53
54 import java.io.IOException  ;
55 import java.io.OutputStream ;
56 import java.util.HashMap ;
57
58 import com.lowagie.text.Document;
59 import com.lowagie.text.DocumentException;
60 import java.util.Arrays ;
61
62
70
71 public class PdfSmartCopy extends PdfCopy {
72
73
74 private HashMap streamMap = null;
75
76
77 public PdfSmartCopy(Document document, OutputStream os) throws DocumentException {
78 super(document, os);
79 this.streamMap = new HashMap ();
80 }
81
93 protected PdfIndirectReference copyIndirect(PRIndirectReference in) throws IOException , BadPdfFormatException {
94 PdfObject srcObj = PdfReader.getPdfObjectRelease(in);
95 ByteStore streamKey = null;
96 if (srcObj.type == PdfObject.STREAM) {
97 streamKey = new ByteStore((PRStream)srcObj);
99 PdfIndirectReference streamRef = (PdfIndirectReference) streamMap.get(streamKey);
100 if (streamRef != null) {
101 return streamRef;
102 }
103 }
104
105 PdfIndirectReference theRef;
106 RefKey key = new RefKey(in);
107 IndirectReferences iRef = (IndirectReferences) indirects.get(key);
108 if (iRef != null) {
109 theRef = iRef.getRef();
110 if (iRef.getCopied()) {
111 return theRef;
112 }
113 } else {
114 theRef = body.getPdfIndirectReference();
115 iRef = new IndirectReferences(theRef);
116 indirects.put(key, iRef);
117 }
118 iRef.setCopied();
119
120 if (srcObj.type == PdfObject.STREAM) {
121 streamMap.put(streamKey, theRef);
122 }
123
124 PdfObject obj = copyObject(srcObj);
125 addToBody(obj, theRef);
126 return theRef;
127 }
128
129 static class ByteStore {
130 private byte[] b;
131 private int hash;
132
133 ByteStore(PRStream str) throws IOException {
134 byte[] streamContent = PdfReader.getStreamBytesRaw(str);
135 Object [] keys = str.getKeys().toArray();
136 Arrays.sort(keys);
137 ByteBuffer bb = new ByteBuffer();
138 for (int k = 0; k < keys.length; ++k) {
139 bb.append(keys[k].toString());
140 }
141 bb.append(streamContent);
142 this.b = bb.toByteArray();
143 }
144
145 public boolean equals(Object obj) {
146 if (!(obj instanceof ByteStore))
147 return false;
148 if (hashCode() != obj.hashCode())
149 return false;
150 return Arrays.equals(b, ((ByteStore)obj).b);
151 }
152
153 public int hashCode() {
154 if (hash == 0) {
155 int len = b.length;
156 for (int k = 0; k < len; ++k) {
157 hash = hash * 31 + (b[k] & 0xff);
158 }
159 }
160 return hash;
161 }
162 }
163 } |
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