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<div class="moz-cite-prefix">Hi John,<br>
<br>
yes, this is a bit waste of space :)<br>
<br>
But the empty space is to avoid thinking about header size in the
consuming class but mainly to avoid breaking the file format when
we insert new data there.<br>
<br>
Regards,<br>
Peter<br>
<br>
On 01.07.2015 02:04, John Zhao wrote:<br>
</div>
<blockquote
cite="mid:CA+EBg9S3cEGRXmNBX27dYDtyLuQO5REzZ-d-wf99TQ-Dbgcr0A@mail.gmail.com"
type="cite">
<div dir="ltr">Hi,
<div><br>
</div>
<div>
<div><span
style="color:rgb(128,128,128);font-family:Menlo;font-size:12pt;font-style:italic">/**<br>
</span><span
style="color:rgb(128,128,128);font-family:Menlo;font-size:12pt;font-style:italic"> * Writes some internal data into the beginning of the specified file.<br>
</span><span
style="color:rgb(128,128,128);font-family:Menlo;font-size:12pt;font-style:italic"> */<br>
</span><span
style="color:rgb(0,0,128);font-family:Menlo;font-size:12pt;font-weight:bold">protected void </span><font
face="Menlo"><span style="font-size:12pt">writeHeader( RandomAccessFile file, </span></font><span
style="color:rgb(0,0,128);font-family:Menlo;font-size:12pt;font-weight:bold">long </span><font
face="Menlo"><span style="font-size:12pt">length, </span></font><span
style="color:rgb(0,0,128);font-family:Menlo;font-size:12pt;font-weight:bold">int </span><font
face="Menlo"><span style="font-size:12pt">segmentSize ) </span></font><span
style="color:rgb(0,0,128);font-family:Menlo;font-size:12pt;font-weight:bold">throws </span><font
face="Menlo"><span style="font-size:12pt">IOException</span></font><br>
<font face="Menlo"><span style="font-size:12pt">{</span></font></div>
<div><font face="Menlo"><span style="font-size:12pt">
file.seek(</span></font><span
style="color:rgb(0,0,255);font-family:Menlo;font-size:12pt">0</span><font
face="Menlo"><span style="font-size:12pt">);</span></font></div>
<div><font face="Menlo"><span style="font-size:12pt">
file.writeUTF(</span></font><span
style="color:rgb(0,128,0);font-family:Menlo;font-size:12pt;font-weight:bold">"GH</span><font
color="#008000" face="Menlo"><span style="font-size:16px"><b>”</b></span></font><font
face="Menlo"><span style="font-size:12pt">); // 4 bytes</span></font></div>
<div><font face="Menlo"><span style="font-size:12pt">
file.writeLong(length); // 8 bytes</span></font><br>
<font face="Menlo"><span style="font-size:12pt">
file.writeInt(segmentSize); // 4 bytes</span></font><br>
<font face="Menlo"><span style="font-size:12pt"> </span></font>
<span
style="color:rgb(0,0,128);font-family:Menlo;font-size:12pt;font-weight:bold">for </span><font
face="Menlo"><span style="font-size:12pt">(</span></font><span
style="color:rgb(0,0,128);font-family:Menlo;font-size:12pt;font-weight:bold">int </span><font
face="Menlo"><span style="font-size:12pt">i = </span></font><span
style="color:rgb(0,0,255);font-family:Menlo;font-size:12pt">0</span><font
face="Menlo"><span style="font-size:12pt">; i < </span></font><span
style="color:rgb(102,14,122);font-family:Menlo;font-size:12pt;font-weight:bold">header</span><font
face="Menlo"><span style="font-size:12pt">.</span></font><span
style="color:rgb(102,14,122);font-family:Menlo;font-size:12pt;font-weight:bold">length</span><font
face="Menlo"><span style="font-size:12pt">; i++)</span></font><br>
<font face="Menlo"><span style="font-size:12pt"> {</span></font><br>
<font face="Menlo"><span style="font-size:12pt">
file.writeInt(</span></font><span
style="color:rgb(102,14,122);font-family:Menlo;font-size:12pt;font-weight:bold">header</span><font
face="Menlo"><span style="font-size:12pt">[i]);</span></font><br>
<font face="Menlo"><span style="font-size:12pt"> }</span></font>
</div>
<div><font face="Menlo"><span style="font-size:12pt">}</span></font></div>
<div><font face="Menlo"><span style="font-size:12pt"><br>
</span></font></div>
<div><font face="Menlo"><span style="font-size:12pt">it's
totally 100 bytes.</span></font></div>
<div><font face="Menlo"><span style="font-size:12pt">We only
use 96 bytes of them.</span></font></div>
<div><font face="Menlo"><span style="font-size:12pt"><br>
</span></font></div>
<div><font face="Menlo"><span style="font-size:12pt">It's not
a problem.</span></font></div>
<div><font face="Menlo"><span style="font-size:12pt">Just
curious.</span></font></div>
<div><font face="Menlo"><span style="font-size:12pt"><br>
</span></font></div>
<div><font face="Menlo"><span style="font-size:12pt">It's
better to use them all, to reduce any further question.
:)</span></font></div>
<div><font face="Menlo"><span style="font-size:12pt"><br>
</span></font></div>
<div>
<div class="gmail_signature"><b>Best Regards,</b>
<div><b>ZhiQiang ZHAO</b></div>
</div>
</div>
</div>
</div>
<br>
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<br>
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