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authorQuincey Koziol <koziol@hdfgroup.org>2004-05-14 04:27:23 (GMT)
committerQuincey Koziol <koziol@hdfgroup.org>2004-05-14 04:27:23 (GMT)
commit77a7fc4428f5ea1545cded5336ba715934507c4a (patch)
tree9cd8b1773a9e2dd7b04fae2a864c734d618dec08
parent13b94ce1e2b4c752acf8f726c97f7aac20e96c15 (diff)
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[svn-r8525] Purpose:
Update information about modification time message.
-rw-r--r--doc/html/H5.format.html76
1 files changed, 73 insertions, 3 deletions
diff --git a/doc/html/H5.format.html b/doc/html/H5.format.html
index fbe22e8..a4707b8 100644
--- a/doc/html/H5.format.html
+++ b/doc/html/H5.format.html
@@ -124,13 +124,14 @@ TABLE.list TD { border:none; }
<li><a href="#LayoutMessage">Name: Data Storage - Layout</a> <!-- 0x0008 -->
<li><a href="#ReservedMessage_0009">Name: Reserved - not assigned yet</a> <!-- 0x0009 -->
<li><a href="#ReservedMessage_000A">Name: Reserved - not assigned yet</a> <!-- 0x000a -->
- <li><a href="#FilterMessage">Name: Data Storage - Filter Pipeline</a> <!-- 0x000b -->
+ <li><a href="#FilterMessage">Name: Data Storage - Filter Pipeline</a> <!-- 0x000b -->
<li><a href="#AttributeMessage">Name: Attribute</a> <!-- 0x000c -->
<li><a href="#NameMessage">Name: Object Name</a> <!-- 0x000d -->
- <li><a href="#ModifiedMessage">Name: Object Modification Date and Time</a> <!-- 0x000e -->
+ <li><a href="#OldModifiedMessage">Name: Object Modification Date and Time (Old)</a> <!-- 0x000e -->
<li><a href="#SharedMessage">Name: Shared Object Message</a> <!-- 0x000f -->
<li><a href="#ContinuationMessage">Name: Object Header Continuation</a> <!-- 0x0010 -->
<li><a href="#SymbolTableMessage">Name: Group Message</a> <!-- 0x0011 -->
+ <li><a href="#ModifiedMessage">Name: Object Modification Date and Time</a> <!-- 0x0012 -->
</ol>
<li><a href="#SharedObjectHeader">Disk Format: Level 2b - Shared Data Object Headers</a>
<li><a href="#DataStorage">Disk Format: Level 2c - Data Object Data Storage</a>
@@ -5213,7 +5214,7 @@ TABLE.list TD { border:none; }
</center>
<hr>
- <h4><a name="ModifiedMessage">Name: Object Modification Date &amp; Time</a></h4>
+ <h4><a name="OldModifiedMessage">Name: Object Modification Date &amp; Time (Old)</a></h4>
<p><b>Header Message Type:</b> 0x000E<br>
<b>Length:</b> fixed<br>
@@ -5502,6 +5503,75 @@ where the group name heap is located.
</dl>
</dl>
+ <hr>
+ <h4><a name="ModifiedMessage">Name: Object Modification Date &amp; Time</a></h4>
+
+ <P class=item><B>Header Message Type:</B> 0x0012
+ </P>
+ <P class=item><B>Length:</B> Fixed
+ </P>
+ <P class=item><B>Status:</B> Optional, may not be repeated.
+ </P>
+
+ <P class=item><B>Description:</B> The object modification date
+ and time is a timestamp which indicates
+ the last modification of an object. The time is
+ updated when any object header message changes according to the
+ system clock where the change was posted.
+ </P>
+
+ <p>
+ <center>
+ <table border align=center cellpadding=4 width="80%">
+ <caption align=top>
+ <b>Modification Time Message</b>
+ </caption>
+
+ <tr align=center>
+ <th width="25%">byte</th>
+ <th width="25%">byte</th>
+ <th width="25%">byte</th>
+ <th width="25%">byte</th>
+ </tr>
+
+ <tr align=center>
+ <td colspan=1>Version</td>
+ <td colspan=3>Reserved</td>
+ </tr>
+
+ <tr align=center>
+ <td colspan=4>Seconds After Epoch</td>
+ </tr>
+ </table>
+ </center>
+
+ <p>
+ <center>
+ <table align=center width="80%">
+ <tr align=left>
+ <th width="30%"><U><font size=+1>Field Name</font></U></th>
+ <th><U><font size=+1>Description</font></U></th>
+ </tr>
+
+ <tr valign=top>
+ <td>Version</td>
+ <td>The version number for the message. This document
+ describes version one of the new modification time message.</td>
+ </tr>
+
+ <tr valign=top>
+ <td>Reserved</td>
+ <td>This field is reserved and should always be zero.</td>
+ </tr>
+
+ <tr valign=top>
+ <td>Seconds After Epoch</td>
+ <td>The number of seconds since 0 hours, 0
+ minutes, 0 seconds, January 1, 1970, Coordinated Universal Time.
+ </tr>
+ </table>
+ </center>
+
<h3><a name="SharedObjectHeader">Disk Format: Level 2b - Shared Data Object Headers</a></h3>
<P>In order to share header messages between several dataset objects, object
header messages may be placed into the global heap. Since these