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| 7 | Compressor (Hadoop 0.20.1 API) |
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| 79 | SUMMARY: NESTED | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD> |
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| 81 | DETAIL: FIELD | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD> |
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| 87 | <HR> |
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| 88 | <!-- ======== START OF CLASS DATA ======== --> |
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| 89 | <H2> |
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| 90 | <FONT SIZE="-1"> |
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| 91 | org.apache.hadoop.io.compress</FONT> |
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| 92 | <BR> |
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| 93 | Interface Compressor</H2> |
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| 94 | <DL> |
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| 95 | <DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../../org/apache/hadoop/io/compress/zlib/BuiltInZlibDeflater.html" title="class in org.apache.hadoop.io.compress.zlib">BuiltInZlibDeflater</A>, <A HREF="../../../../../org/apache/hadoop/io/compress/bzip2/BZip2DummyCompressor.html" title="class in org.apache.hadoop.io.compress.bzip2">BZip2DummyCompressor</A>, <A HREF="../../../../../org/apache/hadoop/io/compress/zlib/ZlibCompressor.html" title="class in org.apache.hadoop.io.compress.zlib">ZlibCompressor</A></DD> |
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| 96 | </DL> |
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| 97 | <HR> |
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| 98 | <DL> |
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| 99 | <DT><PRE>public interface <B>Compressor</B></DL> |
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| 100 | </PRE> |
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| 101 | |
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| 102 | <P> |
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| 103 | Specification of a stream-based 'compressor' which can be |
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| 104 | plugged into a <A HREF="../../../../../org/apache/hadoop/io/compress/CompressionOutputStream.html" title="class in org.apache.hadoop.io.compress"><CODE>CompressionOutputStream</CODE></A> to compress data. |
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| 105 | This is modelled after <A HREF="http://java.sun.com/javase/6/docs/api/java/util/zip/Deflater.html?is-external=true" title="class or interface in java.util.zip"><CODE>Deflater</CODE></A> |
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| 106 | <P> |
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| 107 | |
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| 108 | <P> |
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| 109 | <HR> |
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| 110 | |
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| 111 | <P> |
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| 112 | |
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| 113 | <!-- ========== METHOD SUMMARY =========== --> |
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| 114 | |
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| 115 | <A NAME="method_summary"><!-- --></A> |
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| 116 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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| 117 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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| 118 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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| 119 | <B>Method Summary</B></FONT></TH> |
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| 120 | </TR> |
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| 121 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 122 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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| 123 | <CODE> int</CODE></FONT></TD> |
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| 124 | <TD><CODE><B><A HREF="../../../../../org/apache/hadoop/io/compress/Compressor.html#compress(byte[], int, int)">compress</A></B>(byte[] b, |
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| 125 | int off, |
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| 126 | int len)</CODE> |
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| 127 | |
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| 128 | <BR> |
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| 129 | Fills specified buffer with compressed data.</TD> |
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| 130 | </TR> |
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| 131 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 132 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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| 133 | <CODE> void</CODE></FONT></TD> |
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| 134 | <TD><CODE><B><A HREF="../../../../../org/apache/hadoop/io/compress/Compressor.html#end()">end</A></B>()</CODE> |
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| 135 | |
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| 136 | <BR> |
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| 137 | Closes the compressor and discards any unprocessed input.</TD> |
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| 138 | </TR> |
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| 139 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 140 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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| 141 | <CODE> void</CODE></FONT></TD> |
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| 142 | <TD><CODE><B><A HREF="../../../../../org/apache/hadoop/io/compress/Compressor.html#finish()">finish</A></B>()</CODE> |
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| 143 | |
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| 144 | <BR> |
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| 145 | When called, indicates that compression should end |
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| 146 | with the current contents of the input buffer.</TD> |
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| 147 | </TR> |
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| 148 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 149 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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| 150 | <CODE> boolean</CODE></FONT></TD> |
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| 151 | <TD><CODE><B><A HREF="../../../../../org/apache/hadoop/io/compress/Compressor.html#finished()">finished</A></B>()</CODE> |
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| 152 | |
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| 153 | <BR> |
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| 154 | Returns true if the end of the compressed |
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| 155 | data output stream has been reached.</TD> |
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| 156 | </TR> |
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| 157 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 158 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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| 159 | <CODE> long</CODE></FONT></TD> |
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| 160 | <TD><CODE><B><A HREF="../../../../../org/apache/hadoop/io/compress/Compressor.html#getBytesRead()">getBytesRead</A></B>()</CODE> |
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| 161 | |
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| 162 | <BR> |
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| 163 | Return number of uncompressed bytes input so far.</TD> |
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| 164 | </TR> |
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| 165 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 166 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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| 167 | <CODE> long</CODE></FONT></TD> |
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| 168 | <TD><CODE><B><A HREF="../../../../../org/apache/hadoop/io/compress/Compressor.html#getBytesWritten()">getBytesWritten</A></B>()</CODE> |
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| 169 | |
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| 170 | <BR> |
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| 171 | Return number of compressed bytes output so far.</TD> |
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| 172 | </TR> |
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| 173 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 174 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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| 175 | <CODE> boolean</CODE></FONT></TD> |
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| 176 | <TD><CODE><B><A HREF="../../../../../org/apache/hadoop/io/compress/Compressor.html#needsInput()">needsInput</A></B>()</CODE> |
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| 177 | |
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| 178 | <BR> |
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| 179 | Returns true if the input data buffer is empty and |
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| 180 | #setInput() should be called to provide more input.</TD> |
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| 181 | </TR> |
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| 182 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 183 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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| 184 | <CODE> void</CODE></FONT></TD> |
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| 185 | <TD><CODE><B><A HREF="../../../../../org/apache/hadoop/io/compress/Compressor.html#reset()">reset</A></B>()</CODE> |
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| 186 | |
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| 187 | <BR> |
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| 188 | Resets compressor so that a new set of input data can be processed.</TD> |
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| 189 | </TR> |
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| 190 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 191 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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| 192 | <CODE> void</CODE></FONT></TD> |
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| 193 | <TD><CODE><B><A HREF="../../../../../org/apache/hadoop/io/compress/Compressor.html#setDictionary(byte[], int, int)">setDictionary</A></B>(byte[] b, |
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| 194 | int off, |
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| 195 | int len)</CODE> |
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| 196 | |
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| 197 | <BR> |
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| 198 | Sets preset dictionary for compression.</TD> |
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| 199 | </TR> |
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| 200 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 201 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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| 202 | <CODE> void</CODE></FONT></TD> |
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| 203 | <TD><CODE><B><A HREF="../../../../../org/apache/hadoop/io/compress/Compressor.html#setInput(byte[], int, int)">setInput</A></B>(byte[] b, |
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| 204 | int off, |
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| 205 | int len)</CODE> |
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| 206 | |
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| 207 | <BR> |
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| 208 | Sets input data for compression.</TD> |
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| 209 | </TR> |
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| 210 | </TABLE> |
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| 211 | |
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| 212 | <P> |
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| 213 | |
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| 214 | <!-- ============ METHOD DETAIL ========== --> |
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| 215 | |
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| 216 | <A NAME="method_detail"><!-- --></A> |
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| 217 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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| 218 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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| 219 | <TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"> |
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| 220 | <B>Method Detail</B></FONT></TH> |
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| 221 | </TR> |
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| 222 | </TABLE> |
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| 223 | |
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| 224 | <A NAME="setInput(byte[], int, int)"><!-- --></A><H3> |
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| 225 | setInput</H3> |
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| 226 | <PRE> |
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| 227 | void <B>setInput</B>(byte[] b, |
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| 228 | int off, |
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| 229 | int len)</PRE> |
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| 230 | <DL> |
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| 231 | <DD>Sets input data for compression. |
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| 232 | This should be called whenever #needsInput() returns |
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| 233 | <code>true</code> indicating that more input data is required. |
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| 234 | <P> |
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| 235 | <DD><DL> |
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| 236 | <DT><B>Parameters:</B><DD><CODE>b</CODE> - Input data<DD><CODE>off</CODE> - Start offset<DD><CODE>len</CODE> - Length</DL> |
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| 237 | </DD> |
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| 238 | </DL> |
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| 239 | <HR> |
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| 240 | |
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| 241 | <A NAME="needsInput()"><!-- --></A><H3> |
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| 242 | needsInput</H3> |
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| 243 | <PRE> |
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| 244 | boolean <B>needsInput</B>()</PRE> |
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| 245 | <DL> |
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| 246 | <DD>Returns true if the input data buffer is empty and |
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| 247 | #setInput() should be called to provide more input. |
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| 248 | <P> |
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| 249 | <DD><DL> |
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| 250 | |
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| 251 | <DT><B>Returns:</B><DD><code>true</code> if the input data buffer is empty and |
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| 252 | #setInput() should be called in order to provide more input.</DL> |
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| 253 | </DD> |
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| 254 | </DL> |
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| 255 | <HR> |
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| 256 | |
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| 257 | <A NAME="setDictionary(byte[], int, int)"><!-- --></A><H3> |
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| 258 | setDictionary</H3> |
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| 259 | <PRE> |
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| 260 | void <B>setDictionary</B>(byte[] b, |
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| 261 | int off, |
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| 262 | int len)</PRE> |
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| 263 | <DL> |
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| 264 | <DD>Sets preset dictionary for compression. A preset dictionary |
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| 265 | is used when the history buffer can be predetermined. |
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| 266 | <P> |
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| 267 | <DD><DL> |
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| 268 | <DT><B>Parameters:</B><DD><CODE>b</CODE> - Dictionary data bytes<DD><CODE>off</CODE> - Start offset<DD><CODE>len</CODE> - Length</DL> |
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| 269 | </DD> |
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| 270 | </DL> |
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| 271 | <HR> |
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| 272 | |
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| 273 | <A NAME="getBytesRead()"><!-- --></A><H3> |
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| 274 | getBytesRead</H3> |
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| 275 | <PRE> |
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| 276 | long <B>getBytesRead</B>()</PRE> |
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| 277 | <DL> |
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| 278 | <DD>Return number of uncompressed bytes input so far. |
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| 279 | <P> |
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| 280 | <DD><DL> |
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| 281 | </DL> |
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| 282 | </DD> |
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| 283 | </DL> |
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| 284 | <HR> |
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| 285 | |
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| 286 | <A NAME="getBytesWritten()"><!-- --></A><H3> |
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| 287 | getBytesWritten</H3> |
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| 288 | <PRE> |
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| 289 | long <B>getBytesWritten</B>()</PRE> |
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| 290 | <DL> |
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| 291 | <DD>Return number of compressed bytes output so far. |
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| 292 | <P> |
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| 293 | <DD><DL> |
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| 294 | </DL> |
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| 295 | </DD> |
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| 296 | </DL> |
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| 297 | <HR> |
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| 298 | |
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| 299 | <A NAME="finish()"><!-- --></A><H3> |
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| 300 | finish</H3> |
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| 301 | <PRE> |
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| 302 | void <B>finish</B>()</PRE> |
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| 303 | <DL> |
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| 304 | <DD>When called, indicates that compression should end |
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| 305 | with the current contents of the input buffer. |
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| 306 | <P> |
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| 307 | <DD><DL> |
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| 308 | </DL> |
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| 309 | </DD> |
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| 310 | </DL> |
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| 311 | <HR> |
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| 312 | |
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| 313 | <A NAME="finished()"><!-- --></A><H3> |
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| 314 | finished</H3> |
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| 315 | <PRE> |
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| 316 | boolean <B>finished</B>()</PRE> |
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| 317 | <DL> |
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| 318 | <DD>Returns true if the end of the compressed |
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| 319 | data output stream has been reached. |
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| 320 | <P> |
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| 321 | <DD><DL> |
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| 322 | |
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| 323 | <DT><B>Returns:</B><DD><code>true</code> if the end of the compressed |
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| 324 | data output stream has been reached.</DL> |
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| 325 | </DD> |
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| 326 | </DL> |
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| 327 | <HR> |
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| 328 | |
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| 329 | <A NAME="compress(byte[], int, int)"><!-- --></A><H3> |
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| 330 | compress</H3> |
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| 331 | <PRE> |
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| 332 | int <B>compress</B>(byte[] b, |
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| 333 | int off, |
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| 334 | int len) |
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| 335 | throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE> |
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| 336 | <DL> |
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| 337 | <DD>Fills specified buffer with compressed data. Returns actual number |
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| 338 | of bytes of compressed data. A return value of 0 indicates that |
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| 339 | needsInput() should be called in order to determine if more input |
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| 340 | data is required. |
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| 341 | <P> |
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| 342 | <DD><DL> |
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| 343 | <DT><B>Parameters:</B><DD><CODE>b</CODE> - Buffer for the compressed data<DD><CODE>off</CODE> - Start offset of the data<DD><CODE>len</CODE> - Size of the buffer |
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| 344 | <DT><B>Returns:</B><DD>The actual number of bytes of compressed data. |
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| 345 | <DT><B>Throws:</B> |
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| 346 | <DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL> |
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| 347 | </DD> |
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| 348 | </DL> |
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| 349 | <HR> |
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| 350 | |
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| 351 | <A NAME="reset()"><!-- --></A><H3> |
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| 352 | reset</H3> |
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| 353 | <PRE> |
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| 354 | void <B>reset</B>()</PRE> |
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| 355 | <DL> |
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| 356 | <DD>Resets compressor so that a new set of input data can be processed. |
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| 357 | <P> |
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| 358 | <DD><DL> |
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| 359 | </DL> |
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| 360 | </DD> |
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| 361 | </DL> |
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| 362 | <HR> |
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| 363 | |
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| 364 | <A NAME="end()"><!-- --></A><H3> |
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| 365 | end</H3> |
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| 366 | <PRE> |
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| 367 | void <B>end</B>()</PRE> |
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| 368 | <DL> |
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| 369 | <DD>Closes the compressor and discards any unprocessed input. |
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| 370 | <P> |
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| 371 | <DD><DL> |
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| 372 | </DL> |
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| 373 | </DD> |
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| 374 | </DL> |
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| 375 | <!-- ========= END OF CLASS DATA ========= --> |
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| 376 | <HR> |
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| 377 | |
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| 378 | |
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| 379 | <!-- ======= START OF BOTTOM NAVBAR ====== --> |
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| 380 | <A NAME="navbar_bottom"><!-- --></A> |
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| 381 | <A HREF="#skip-navbar_bottom" title="Skip navigation links"></A> |
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| 385 | <A NAME="navbar_bottom_firstrow"><!-- --></A> |
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| 387 | <TR ALIGN="center" VALIGN="top"> |
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| 388 | <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> |
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