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Diffstat (limited to 'doc/html/H5.format.html')
| -rw-r--r-- | doc/html/H5.format.html | 250 |
1 files changed, 233 insertions, 17 deletions
diff --git a/doc/html/H5.format.html b/doc/html/H5.format.html index 1868138..ae1ff23 100644 --- a/doc/html/H5.format.html +++ b/doc/html/H5.format.html @@ -130,8 +130,7 @@ TABLE.list TD { border:none; } <li><a href="#AttributeMessage">Name: Attribute</a> <!-- 0x000c --> <li><a href="#CommentMessage">Name: Object Comment</a> <!-- 0x000d --> <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="#ReservedMessage_000F">Name: Reserved - not assigned yet</a> <!-- 0x000f --> + <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 --> @@ -4729,14 +4728,17 @@ TABLE.list TD { border:none; } addresses. <li>The array can be stored in one contiguous block, as part of - this object header message. + this object header message (this is called "compact" storage below). </ol> + + <P>Version 3 of this message re-structured the format into specific + properties that are required for each layout class. <p> <center> <table border cellpadding=4 width="80%"> <caption align=top> - <B>Data Layout Message</B> + <B>Data Layout Message, Versions 1 and 2</B> </caption> <tr align=center> @@ -4850,6 +4852,233 @@ TABLE.list TD { border:none; } </table> </center> + <p> + <center> + <table border cellpadding=4 width="80%"> + <caption align=top> + <B>Data Layout Message, Version 3</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>Version</td> + <td>Layout Class</td> + </tr> + + <tr align=center> + <td colspan=4>Properties</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>A version number for the layout message. This value can be + either 1, 2 or 3.</td> + </tr> + + <tr valign=top> + <td>Layout Class</td> + <td>The layout class specifies how the other fields of the + layout message are to be interpreted. A value of one + indicates contiguous storage, a value of two + indicates chunked storage, + while a value of three + indicates compact storage.</td> + </tr> + + <tr valign=top> + <td>Properties</td> + <td>This variable-sized field encodes information specific to each + layout class and is described below. If there is no property + information specified for a layout class, the size of this field + is zero bytes.</td> + </tr> + + </table> + </center> + + <P>Class-specific information for contiguous layout (Class 0): + + <p> + <center> + <table border cellpadding=4 width="80%"> + <caption align=top> + <B>Property Descriptions</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=4><br>Address<br><br></td> + </tr> + + <tr align=center> + <td colspan=4><br>Size<br><br></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>Address</td> + <td>This is the address of the first byte of raw data storage. + The address may have the "undefined address" value, to indicate + that storage has not yet been allocated for this array.</td> + </tr> + + <tr valign=top> + <td>Size</td> + <td>This field contains the size allocated to store the raw data.</td> + </table> + </center> + + <P>Class-specific information for chunked layout (Class 1): + + <p> + <center> + <table border cellpadding=4 width="80%"> + <caption align=top> + <B>Property Descriptions</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>Dimensionality</td> + </tr> + + <tr align=center> + <td colspan=4><br>Address<br><br></td> + </tr> + + <tr align=center> + <td colspan=4>Dimension 0 (4-bytes)</td> + </tr> + + <tr align=center> + <td colspan=4>Dimension 1 (4-bytes)</td> + </tr> + + <tr align=center> + <td colspan=4>...</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>Dimensionality</td> + <td>A chunk has a fixed dimensionality. This field + specifies the number of dimension size fields later in the + message.</td> + </tr> + + <tr valign=top> + <td>Address</td> + <td>This is the address + of the B-tree that is used to look up the addresses of the + chunks. + The address + may have the "undefined address" value, to indicate that + storage has not yet been allocated for this array.</td> + </tr> + + <tr valign=top> + <td>Dimensions</td> + <td>The dimension sizes define the size of a single chunk.</td> + </tr> + </table> + </center> + + <P>Class-specific information for compact layout (Class 2): + + <p> + <center> + <table border cellpadding=4 width="80%"> + <caption align=top> + <B>Property Descriptions</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=2>Size</td> + </tr> + + <tr align=center> + <td colspan=4>Raw Data</td> + </tr> + + <tr align=center> + <td colspan=4>...</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>Size</td> + <td>This field contains the size of the raw data for the dataset array.</td> + + <tr valign=top> + <td>Raw Data</td> + <td>This field contains the raw data for the dataset array.</td> + </tr> + </table> + </center> + <hr> <h4><a name="ReservedMessage_0009">Name: Reserved - Not Assigned Yet</a></h4> @@ -5348,7 +5577,6 @@ TABLE.list TD { border:none; } </table> </center> -<!-- <hr> <h4><a name="SharedMessage">Name: Shared Object Message</a></h4> <b>Header Message Type:</b> 0x000F<br> @@ -5444,20 +5672,8 @@ TABLE.list TD { border:none; } </tr> </table> </center> ---> - <hr> - <h4><a name="ReservedMessage_000F">Name: Reserved - Not Assigned Yet</a></h4> - <b>Header Message Type:</b> 0x000F<BR> - <b>Length:</b> N/A<BR> - <b>Status:</b> N/A<BR> - <b>Format of Data:</b> N/A<BR> - - <p><b>Purpose and Description:</b> This message type was skipped during - the initial specification of the file format and may be used in a - future expansion to the format. - <hr> <h4><a name="ContinuationMessage">Name: Object Header Continuation</a></h4> <b>Header Message Type:</b> 0x0010<BR> |