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| author | byrnHDF <byrnHDF@users.noreply.github.com> | 2023-11-16 13:49:28 (GMT) |
|---|---|---|
| committer | byrnHDF <byrnHDF@users.noreply.github.com> | 2023-11-16 13:49:28 (GMT) |
| commit | 4f20d880c97be1249f8d89ced95f72836dbf3ee0 (patch) | |
| tree | 30d8dcb282134b7126b092796f2be00d2d97bd3c /develop/_f_m_t_d_i_s_c.html | |
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diff --git a/develop/_f_m_t_d_i_s_c.html b/develop/_f_m_t_d_i_s_c.html new file mode 100644 index 0000000..8ef104f --- /dev/null +++ b/develop/_f_m_t_d_i_s_c.html @@ -0,0 +1,1393 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> +<html xmlns="http://www.w3.org/1999/xhtml"> +<head> +<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> +<meta http-equiv="X-UA-Compatible" content="IE=9"/> +<meta name="generator" content="Doxygen 1.9.1"/> +<meta name="viewport" content="width=device-width, initial-scale=1"/> +<title>HDF5: HDF5 File Format Discussion</title> +<link href="tabs.css" rel="stylesheet" type="text/css"/> +<script type="text/javascript" src="jquery.js"></script> +<script type="text/javascript" src="dynsections.js"></script> +<link href="navtree.css" rel="stylesheet" type="text/css"/> +<script type="text/javascript" src="resize.js"></script> +<script type="text/javascript" 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url=(0072)https://gamma.hdfgroup.org/papers/HISS/030515.FileFormat/FileFormat.html --> +<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> + <title>HDF5 File Format Discussion</title> + + <meta name="author" content="Quincey Koziol"> +</head> + +<body text="#000000" bgcolor="#FFFFFF"> + +<style type="text/css"> +OL.loweralpha { list-style-type: lower-alpha } +OL.upperroman { list-style-type: upper-roman } +</style> + +<style type="text/css"> +TD CAPTION EM { color: red } +TD EM { color: blue } +TABLE CAPTION STRONG { font-size: larger } +</style> + +<center><h1>HDF5 File Format Discussion</h1></center> +<center><h3>Quincey Koziol<br> + koziol@ncsa.uiuc.edu<br> + May 15, 2003 +</h3></center> + +<ol class="upperroman"> + +<li><h3><u>Document's Audience:</u></h3> + +<ul> + <li>Current H5 library designers and knowledgeable external developers.</li> +</ul> + +</li><li><h3><u>Background Reading:</u></h3> + +<dl> + <dt><a href="https://hdfgroup.github.io/hdf5/develop/_s_p_e_c.html">HDF5 File Format Specification</a> + </dt><dd>This describes the current HDF5 file format. +</dd></dl> + +</li><li><h3><u>Introduction:</u></h3> + +<dl> + <dt><strong>What is this document about?</strong></dt> + <dd>This document attempts to explain the HDF5 file format + specification with a few examples and describes some potential + improvements to the format specification. + </dd> <br> +</dl> + +</li><li><h3><u>File Format Examples:</u></h3> + +<p>This section has several small programs and describes the format of a file +created with each of them. +</p> + +<p>Example program one - <em>Create an empty file</em>: +</p><pre> <code> +#include "hdf5.h" +#include <assert.h> + +int main() +{ + hid_t fid; /* File ID */ + herr_t ret; /* Generic return value */ + + /* Create the file */ + fid=H5Fcreate("example1.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT); + assert(fid>=0); + + /* Close the file */ + ret=H5Fclose(fid); + assert(ret>=0); + + return(0); +} +</assert.h></code> </pre> + + <center> + <table border="" align="center" cellpadding="4" width="80%"> + <caption align="top"> + <strong>Super Block</strong> + </caption> + + <tbody><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>\211</td> + <td>'H'</td> + <td>'D'</td> + <td>'F'</td> + </tr> + + <tr align="center"> + <td>\r</td> + <td>\n</td> + <td>\032</td> + <td>\n</td> + </tr> + + <tr align="center"> + <td>0</td> + <td>0</td> + <td>0</td> + <td>0</td> + </tr> + + <tr align="center"> + <td>0</td> + <td>8</td> + <td>8</td> + <td>0</td> + </tr> + + <tr align="center"> + <td colspan="2">4</td> + <td colspan="2">16</td> + </tr> + + <tr align="center"> + <td colspan="4">0x00000003</td> + </tr> + + <tr align="center"> + <td colspan="4">0</td> + </tr> + + <tr align="center"> + <td colspan="4"><br>0xffffffffffffffff<br><br></td> + </tr> + + <tr align="center"> + <td colspan="4">?</td> + </tr> + + <tr align="center"> + <td colspan="4"><br>0xffffffffffffffff<br><br></td> + </tr> + + <tr align="center"> + <td colspan="4"> + <table border="" width="100%"> + <tbody><tr align="center"> + <td colspan="4">0</td> + </tr> + + <tr align="center"> + <td colspan="4"><br>928<br><br></td> + </tr> + + <tr align="center"> + <td colspan="4">H5G_CACHED_STAB (1)</td> + </tr> + + <tr align="center"> + <td colspan="4">0</td> + </tr> + + <tr align="center"> + <td colspan="4"> + <table border="" width="100%"> + <tbody><tr align="center"> + <td colspan="4"><br>384<br><br></td> + </tr> + <tr align="center"> + <td colspan="4"><br>96<br><br></td> + </tr> + </tbody></table> + </td> + </tr> + </tbody></table> + </td> + </tr> + </tbody></table> + </center> +<br> +<pre> <code> +%h5debug example1.h5 + +Reading signature at address 0 (rel) +File Super Block... +File name: example1.h5 +File access flags 0x00000000 +File open reference count: 1 +Address of super block: 0 (abs) +Size of user block: 0 bytes +Super block version number: 0 +Free list version number: 0 +Root group symbol table entry version number: 0 +Shared header version number: 0 +Size of file offsets (haddr_t type): 8 bytes +Size of file lengths (hsize_t type): 8 bytes +Symbol table leaf node 1/2 rank: 4 +Symbol table internal node 1/2 rank: 16 +File consistency flags: 0x00000003 +Base address: 0 (abs) +Free list address: UNDEF (rel) +Address of driver information block: UNDEF (rel) +Root group symbol table entry: + Name offset into private heap: 0 + Object header address: 928 + Dirty: Yes + Cache info type: Symbol Table + Cached information: + B-tree address: 384 + Heap address: 96 +</code> </pre> + + + <center> + <table border="" cellpadding="4" width="80%"> + <caption align="top"> + <strong>Root Group Object Header</strong> + </caption> + + <tbody><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" width="25%">1</td> + <td colspan="1" width="25%">0</td> + <td colspan="2" width="50%">2</td> + </tr> + <tr align="center"> + <td colspan="4">1</td> + </tr> + <tr align="center"> + <td colspan="4">32</td> + </tr> + <tr align="center"> + <td colspan="2">0x0011</td> + <td colspan="2">16</td> + </tr> + <tr align="center"> + <td>0x01</td> + <td colspan="3">0</td> + </tr> + <tr align="center"> + <td colspan="4"> + <table border="" width="100%"> + <tbody><tr align="center"> + <td colspan="4"><br>384<br><br></td> + </tr> + <tr align="center"> + <td colspan="4"><br>96<br><br></td> + </tr> + </tbody></table> + </td> + </tr> + <tr align="center"> + <td colspan="2">0</td> + <td colspan="2">0</td> + </tr> + <tr align="center"> + <td>0x00</td> + <td colspan="3">0</td> + </tr> + </tbody></table> + </center> +<br> +<pre> <code> +%h5debug example1.h5 928 + +New address: 928 +Reading signature at address 928 (rel) +Object Header... +Dirty: 0 +Version: 1 +Header size (in bytes): 16 +Number of links: 1 +Number of messages (allocated): 2 (32) +Number of chunks (allocated): 1 (8) +Chunk 0... + Dirty: 0 + Address: 944 + Size in bytes: 32 +Message 0... + Message ID (sequence number): 0x0011 stab(0) + Shared message: No + Constant: Yes + Raw size in obj header: 16 bytes + Chunk number: 0 + Message Information: + B-tree address: 384 + Name heap address: 96 +Message 1... + Message ID (sequence number): 0x0000 null(0) + Shared message: No + Constant: No + Raw size in obj header: 0 bytes + Chunk number: 0 + Message Information: + <no info="" for="" this="" message=""> +</no></code> </pre> + + <center> + <table border="" cellpadding="4" width="80%"> + <caption align="top"> + <strong>Root Group Local Heap</strong> + </caption> + + <tbody><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>'H'</td> + <td>'E'</td> + <td>'A'</td> + <td>'P'</td> + </tr> + + <tr align="center"> + <td colspan="4">0</td> + </tr> + + <tr align="center"> + <td colspan="4">256</td> + </tr> + + <tr align="center"> + <td colspan="4">8</td> + </tr> + + <tr align="center"> + <td colspan="4">128</td> + </tr> + </tbody></table> + </center> +<br> + +<pre> <code> +%h5debug example1.h5 96 + +New address: 96 +Reading signature at address 96 (rel) +Local Heap... +Dirty: 0 +Header size (in bytes): 32 +Address of heap data: 128 +Data bytes allocated on disk: 256 +Data bytes allocated in core: 256 +Free Blocks (offset, size): + Block #0: 8, 248 +Percent of heap used: 3.12% +Data follows (`__' indicates free region)... + 0: 00 00 00 00 00 00 00 00 __ __ __ __ __ __ __ __ ........ + 16: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 32: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 48: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 64: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 80: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 96: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 112: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 128: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 144: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 160: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 176: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 192: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 208: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 224: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 240: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + +</code> </pre> + + <center> + <table border="" cellpadding="4" width="80%"> + <caption align="top"> + <strong>Root Group B-tree</strong> + </caption> + + <tbody><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>'T'</td> + <td>'R'</td> + <td>'E'</td> + <td>'E'</td> + + </tr><tr align="center"> + <td>0</td> + <td>0</td> + <td colspan="2">0</td> + + </tr><tr align="center"> + <td colspan="4"><br>0xffffffffffffffff<br><br></td> + + </tr><tr align="center"> + <td colspan="4"><br>0xffffffffffffffff<br><br></td> + + </tr></tbody></table> + </center> +<br> +<pre> <code> +%h5debug example1.h5 384 96 + +New address: 384 +Reading signature at address 384 (rel) +Tree type ID: H5B_SNODE_ID +Size of node: 544 +Size of raw (disk) key: 8 +Dirty flag: False +Number of initial dirty children: 0 +Level: 0 +Address of left sibling: UNDEF +Address of right sibling: UNDEF +Number of children (max): 0 (32) + +</code> </pre> + +<p></p> + +<p>Example program two - <em>Create a file with a single dataset in it</em>: +</p><pre> <code> +#include "hdf5.h" +#include <assert.h> + +int main() +{ + hid_t fid; /* File ID */ + hid_t sid; /* Dataspace ID */ + hid_t did; /* Dataset ID */ + herr_t ret; /* Generic return value */ + + /* Create the file */ + fid=H5Fcreate("example2.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT); + assert(fid>=0); + + /* Create a scalar dataspace for the dataset */ + sid=H5Screate(H5S_SCALAR); + assert(sid>=0); + + /* Create a trivial dataset */ + did=H5Dcreate(fid, "Dataset", H5T_NATIVE_INT, sid, H5P_DEFAULT); + assert(did>=0); + + /* Close the dataset */ + ret=H5Dclose(did); + assert(ret>=0); + + /* Close the dataspace */ + ret=H5Sclose(sid); + assert(ret>=0); + + /* Close the file */ + ret=H5Fclose(fid); + assert(ret>=0); + + return(0); +} +</assert.h></code> </pre> + + <center> + <table border="" align="center" cellpadding="4" width="80%"> + <caption align="top"> + <strong>Super Block</strong> + </caption> + + <tbody><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>\211</td> + <td>'H'</td> + <td>'D'</td> + <td>'F'</td> + </tr> + + <tr align="center"> + <td>\r</td> + <td>\n</td> + <td>\032</td> + <td>\n</td> + </tr> + + <tr align="center"> + <td>0</td> + <td>0</td> + <td>0</td> + <td>0</td> + </tr> + + <tr align="center"> + <td>0</td> + <td>8</td> + <td>8</td> + <td>0</td> + </tr> + + <tr align="center"> + <td colspan="2">4</td> + <td colspan="2">16</td> + </tr> + + <tr align="center"> + <td colspan="4">0x00000003</td> + </tr> + + <tr align="center"> + <td colspan="4">0</td> + </tr> + + <tr align="center"> + <td colspan="4"><br>0xffffffffffffffff<br><br></td> + </tr> + + <tr align="center"> + <td colspan="4">?</td> + </tr> + + <tr align="center"> + <td colspan="4"><br>0xffffffffffffffff<br><br></td> + </tr> + + <tr align="center"> + <td colspan="4"> + <table border="" width="100%"> + <tbody><tr align="center"> + <td colspan="4">0</td> + </tr> + + <tr align="center"> + <td colspan="4"><br>928<br><br></td> + </tr> + + <tr align="center"> + <td colspan="4">H5G_CACHED_STAB (1)</td> + </tr> + + <tr align="center"> + <td colspan="4">0</td> + </tr> + + <tr align="center"> + <td colspan="4"> + <table border="" width="100%"> + <tbody><tr align="center"> + <td colspan="4"><br>384<br><br></td> + </tr> + <tr align="center"> + <td colspan="4"><br>96<br><br></td> + </tr> + </tbody></table> + </td> + </tr> + </tbody></table> + </td> + </tr> + </tbody></table> + </center> +<br> +<pre> <code> +%h5debug example2.h5 + +Reading signature at address 0 (rel) +File Super Block... +File name: example2.h5 +File access flags 0x00000000 +File open reference count: 1 +Address of super block: 0 (abs) +Size of user block: 0 bytes +Super block version number: 0 +Free list version number: 0 +Root group symbol table entry version number: 0 +Shared header version number: 0 +Size of file offsets (haddr_t type): 8 bytes +Size of file lengths (hsize_t type): 8 bytes +Symbol table leaf node 1/2 rank: 4 +Symbol table internal node 1/2 rank: 16 +File consistency flags: 0x00000003 +Base address: 0 (abs) +Free list address: UNDEF (rel) +Address of driver information block: UNDEF (rel) +Root group symbol table entry: + Name offset into private heap: 0 + Object header address: 928 + Dirty: Yes + Cache info type: Symbol Table + Cached entry information: + B-tree address: 384 + Heap address: 96 +</code> </pre> + + <center> + <table border="" cellpadding="4" width="80%"> + <caption align="top"> + <strong>Root Group Object Header</strong> + </caption> + + <tbody><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" width="25%">1</td> + <td colspan="1" width="25%">0</td> + <td colspan="2" width="50%">2</td> + </tr> + <tr align="center"> + <td colspan="4">1</td> + </tr> + <tr align="center"> + <td colspan="4">32</td> + </tr> + <tr align="center"> + <td colspan="2">0x0011</td> + <td colspan="2">16</td> + </tr> + <tr align="center"> + <td>0x01</td> + <td colspan="3">0</td> + </tr> + <tr align="center"> + <td colspan="4"> + <table border="" width="100%"> + <tbody><tr align="center"> + <td colspan="4"><br>384<br><br></td> + </tr> + <tr align="center"> + <td colspan="4"><br>96<br><br></td> + </tr> + </tbody></table> + </td> + </tr> + <tr align="center"> + <td colspan="2">0</td> + <td colspan="2">0</td> + </tr> + <tr align="center"> + <td>0x00</td> + <td colspan="3">0</td> + </tr> + </tbody></table> + </center> +<br> +<pre> <code> +%h5debug example2.h5 928 + +New address: 928 +Reading signature at address 928 (rel) +Object Header... +Dirty: 0 +Version: 1 +Header size (in bytes): 16 +Number of links: 1 +Number of messages (allocated): 2 (32) +Number of chunks (allocated): 1 (8) +Chunk 0... + Dirty: 0 + Address: 944 + Size in bytes: 32 +Message 0... + Message ID: 0x0011 stab(0) + Shared message: No + Constant: Yes + Raw size in obj header: 16 bytes + Chunk number: 0 + Message Information: + B-tree address: 384 + Name heap address: 96 +Message 1... + Message ID: 0x0000 null(0) + Shared message: No + Constant: No + Raw size in obj header: 0 bytes + Chunk number: 0 + Message Information: + <no info="" for="" this="" message=""> +</no></code> </pre> + + <center> + <table border="" cellpadding="4" width="80%"> + <caption align="top"> + <strong>Root Group Local Heap</strong> + </caption> + + <tbody><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>'H'</td> + <td>'E'</td> + <td>'A'</td> + <td>'P'</td> + </tr> + + <tr align="center"> + <td colspan="4">0</td> + </tr> + + <tr align="center"> + <td colspan="4">256</td> + </tr> + + <tr align="center"> + <td colspan="4">16</td> + </tr> + + <tr align="center"> + <td colspan="4">128</td> + </tr> + </tbody></table> + </center> +<br> + +<pre> <code> +%h5debug example2.h5 96 + +New address: 96 +Reading signature at address 96 (rel) +Local Heap... +Dirty: 0 +Header size (in bytes): 32 +Address of heap data: 128 +Data bytes allocated on disk: 256 +Data bytes allocated in core: 256 +Free Blocks (offset, size): + Block #0: 16, 240 +Percent of heap used: 6.25% +Data follows (`__' indicates free region)... + 0: 00 00 00 00 00 00 00 00 44 61 74 61 73 65 74 00 ........Dataset. + 16: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 32: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 48: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 64: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 80: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 96: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 112: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 128: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 144: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 160: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 176: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 192: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 208: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 224: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ + 240: __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ +</code> </pre> + + <center> + <table border="" cellpadding="4" width="80%"> + <caption align="top"> + <strong>Root Group B-tree</strong> + </caption> + + <tbody><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>'T'</td> + <td>'R'</td> + <td>'E'</td> + <td>'E'</td> + + </tr><tr align="center"> + <td>0</td> + <td>0</td> + <td colspan="2">1</td> + + </tr><tr align="center"> + <td colspan="4"><br>0xffffffffffffffff<br><br></td> + + </tr><tr align="center"> + <td colspan="4"><br>0xffffffffffffffff<br><br></td> + + </tr><tr align="center"> + <td colspan="4"><br>0<br><br></td> + + </tr><tr align="center"> + <td colspan="4"><br>1248<br><br></td> + + </tr><tr align="center"> + <td colspan="4"><br>8<br><br></td> + + </tr></tbody></table> + </center> +<br> +<pre> <code> +%h5debug example2.h5 384 96 + +New address: 384 +Reading signature at address 384 (rel) +Tree type ID: H5B_SNODE_ID +Size of node: 544 +Size of raw (disk) key: 8 +Dirty flag: False +Number of initial dirty children: 0 +Level: 0 +Address of left sibling: UNDEF +Address of right sibling: UNDEF +Number of children (max): 1 (32) +Child 0... + Address: 1248 + Left Key: + Heap offset: 0 + Name : + Right Key: + Heap offset: 8 + Name : Dataset +</code> </pre> + + <center> + <table border="" cellpadding="4" width="80%"> + <caption align="top"> + <strong>Root Group B-tree Symbol Table Node</strong> + </caption> + + <tbody><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>'S'</td> + <td>'N'</td> + <td>'O'</td> + <td>'D'</td> + + </tr><tr align="center"> + <td>1</td> + <td>0</td> + <td colspan="2">1</td> + + </tr><tr align="center"> + <td colspan="4"> + <table border="" width="100%"> + <tbody><tr align="center"> + <td colspan="4">8</td> + </tr> + + <tr align="center"> + <td colspan="4"><br>976<br><br></td> + </tr> + + <tr align="center"> + <td colspan="4">0</td> + </tr> + + <tr align="center"> + <td colspan="4">0</td> + </tr> + + <tr align="center"> + <td colspan="4"><br><br>0<br><br><br></td> + </tr> + </tbody></table> + </td> + + </tr></tbody></table> + </center> +<br> +<pre> <code> +%h5debug example2.h5 1248 96 + +New address: 1248 +Reading signature at address 1248 (rel) +Symbol Table Node... +Dirty: No +Size of Node (in bytes): 328 +Number of Symbols: 1 of 8 +Symbol 0: + Name: `Dataset' + Name offset into private heap: 8 + Object header address: 976 + Dirty: No + Cache info type: Nothing Cached +</code> </pre> + + <center> + <table border="" cellpadding="4" width="90%"> + <caption align="top"> + <strong>'/Dataset' Object Header</strong> + </caption> + + <tbody><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"><em>Version:</em> 1</td> + <td colspan="1"><em>Reserved:</em> 0</td> + <td colspan="2"><em>Number of Header Messages:</em> 6</td> + </tr> + <tr align="center"> + <td colspan="4"><em>Object Reference Count:</em> 1</td> + </tr> + <tr align="center"> + <td colspan="4"><em>Total Object Header Size:</em> 256</td> + </tr> +<!-- Fill Value Header Message --> + <tr align="center"> + <td colspan="4"> + <table border="" width="100%"> + <caption align="top" color="#80FFFF"> + <em>Fill Value Header Message</em> + </caption> + <tbody><tr align="center"> + <th width="25%"></th> + <th width="25%"></th> + <th width="25%"></th> + <th width="25%"></th> + </tr> + + <tr align="center"> + <!-- Object Header Message Type --> + <td colspan="2"><em>Message Type:</em> 0x0005</td> + <!-- Object Header Message Length --> + <td colspan="2"><em>Message Data Size:</em> 8</td> + </tr> + <tr align="center"> + <!-- Object Header Message Flags --> + <td colspan="1"><em>Flags:</em> 0x01</td> + <!-- Reserved --> + <td colspan="3"><em>Reserved:</em> 0</td> + </tr> + <tr align="center"> + <!-- Version --> + <td colspan="1"><em>Version:</em> 1</td> + <!-- Space Allocation Time --> + <td colspan="1"><em>Space Allocation Time:</em> 2 (Late)</td> + <!-- Fill Value Writing Time --> + <td colspan="1"><em>Fill Value Writing Time:</em> 0 (At allocation)</td> + <!-- Fill Value Defined --> + <td colspan="1"><em>Fill Value Defined:</em> 0 (Undefined)</td> + </tr> + <tr align="center"> + <!-- Fill Value Datatype Size --> + <td colspan="4"><em>Fill Value Datatype Size:</em> 0 (Use dataset's datatype for fill-value datatype)</td> + </tr> + </tbody></table> + </td> + </tr> +<!-- Datatype Header Message --> + <tr align="center"> + <td colspan="4"> + <table border="" width="100%"> + <caption align="top"> + <em>Datatype Header Message</em> + </caption> + <tbody><tr align="center"> + <th width="25%"></th> + <th width="25%"></th> + <th width="25%"></th> + <th width="25%"></th> + </tr> + + <tr align="center"> + <!-- Object Header Message Type --> + <td colspan="2"><em>Message Type:</em> 0x0003</td> + <!-- Object Header Message Length --> + <td colspan="2"><em>Message Data Size:</em> 16</td> + </tr> + <tr align="center"> + <!-- Object Header Message Flags --> + <td colspan="1"><em>Flags:</em> 0x01</td> + <!-- Reserved --> + <td colspan="3"><em>Reserved:</em> 0</td> + </tr> + <tr align="center"> + <!-- Type Class and Version --> + <td colspan="1"> + <table border="" width="100%"> + <tbody><tr align="center"> + <td width="50%"><em>Version:</em> 0x1</td> + <td><em>Class:</em> 0x0 (Fixed-Point)</td> + </tr> + </tbody></table> + </td> + <!-- Class Bit Field --> + <td colspan="3"><em>Fixed-Point Bit-Field:</em> 0x08 (Little-endian, No padding, Signed)</td> + </tr> + <tr align="center"> + <!-- Type Size (in bytes) --> + <td colspan="4"><em>Size:</em> 4</td> + </tr> + <tr align="center"> + <!-- Bit Offset --> + <td colspan="2"><em>Bit Offset:</em> 0</td> + <!-- Bit Precision --> + <td colspan="2"><em>Bit Precision:</em> 32</td> + </tr> + <tr align="center"> + <!-- Message alignment filler --> + <td colspan="4"><em>Message Alignment Filler:</em> -</td> + </tr> + </tbody></table> + </td> + </tr> +<!-- Dataspace Header Message --> + <tr align="center"> + <td colspan="4"> + <table border="" width="100%"> + <caption align="top"> + <em>Dataspace Header Message</em> + </caption> + <tbody><tr align="center"> + <th width="25%"></th> + <th width="25%"></th> + <th width="25%"></th> + <th width="25%"></th> + </tr> + + <tr align="center"> + <!-- Object Header Message Type --> + <td colspan="2"><em>Message Type:</em> 0x0001</td> + <!-- Object Header Message Length --> + <td colspan="2"><em>Message Data Size:</em> 8</td> + </tr> + <tr align="center"> + <!-- Object Header Message Flags --> + <td colspan="1"><em>Flags:</em> 0x00</td> + <!-- Reserved --> + <td colspan="3"><em>Reserved:</em> 0</td> + </tr> + <tr align="center"> + <!-- Version --> + <td colspan="1"><em>Version:</em> 1</td> + <!-- Rank --> + <td colspan="1"><em>Rank:</em> 0 (Scalar)</td> + <!-- Flags --> + <td colspan="1"><em>Flags:</em> 0x00 (No maximum dimensions, no permutation information)</td> + <!-- Reserved --> + <td colspan="1"><em>Reserved:</em> 0</td> + </tr> + <tr align="center"> + <!-- Reserved --> + <td colspan="4"><em>Reserved:</em> 0</td> + </tr> + </tbody></table> + </td> + </tr> +<!-- Layout Header Message --> + <tr align="center"> + <td colspan="4"> + <table border="" width="100%"> + <caption align="top"> + <em>Layout Header Message</em> + </caption> + <tbody><tr align="center"> + <th width="25%"></th> + <th width="25%"></th> + <th width="25%"></th> + <th width="25%"></th> + </tr> + + <tr align="center"> + <!-- Object Header Message Type --> + <td colspan="2"><em>Message Type:</em> 0x0008</td> + <!-- Object Header Message Length --> + <td colspan="2"><em>Message Data Size:</em> 24</td> + </tr> + <tr align="center"> + <!-- Object Header Message Flags --> + <td colspan="1"><em>Flags:</em> 0x00</td> + <!-- Reserved --> + <td colspan="3"><em>Reserved:</em> 0</td> + </tr> + <tr align="center"> + <!-- Version --> + <td colspan="1"><em>Version:</em> 1</td> + <!-- Rank --> + <td colspan="1"><em>Rank:</em> 1 (Dataspace rank+1)</td> + <!-- Class --> + <td colspan="1"><em>Class:</em> 1 (Contiguous)</td> + <!-- Reserved --> + <td colspan="1"><em>Reserved:</em> 0</td> + </tr> + <tr align="center"> + <!-- Reserved --> + <td colspan="4"><em>Reserved:</em> 0</td> + </tr> + <tr align="center"> + <!-- Address --> + <td colspan="4"><br><em>Address:</em> 0xffffffffffffffff (Undefined)<br><br></td> + </tr> + <tr align="center"> + <!-- Layout Dimensions --> + <td colspan="4"><em>Dimension 0 Size:</em> 4 (Datatype size)</td> + </tr> + <tr align="center"> + <!-- Message alignment filler --> + <td colspan="4"><em>Message Alignment Filler:</em> -</td> + </tr> + </tbody></table> + </td> + </tr> +<!-- Modification Date & Time Header Message --> + <tr align="center"> + <td colspan="4"> + <table border="" width="100%"> + <caption align="top"> + <em>Modification Date & Time Header Message</em> + </caption> + <tbody><tr align="center"> + <th width="25%"></th> + <th width="25%"></th> + <th width="25%"></th> + <th width="25%"></th> + </tr> + + <tr align="center"> + <!-- Object Header Message Type --> + <td colspan="2"><em>Message Type:</em> 0x0012</td> + <!-- Object Header Message Length --> + <td colspan="2"><em>Message Data Size:</em> 8</td> + </tr> + <tr align="center"> + <!-- Object Header Message Flags --> + <td colspan="1"><em>Flags:</em> 0x00</td> + <!-- Reserved --> + <td colspan="3"><em>Reserved:</em> 0</td> + </tr> + <tr align="center"> + <!-- Version --> + <td colspan="1"><em>Version:</em> 1</td> + <!-- Reserved --> + <td colspan="3"><em>Reserved:</em> 0</td> + </tr> + <tr align="center"> + <!-- Modification time --> + <td colspan="4"><em>Seconds Since Epoch:</em> 1052401700 (2003-05-08 08:48:20 CDT)</td> + </tr> + </tbody></table> + </td> + </tr> +<!-- Null Header Message --> + <tr align="center"> + <td colspan="4"> + <table border="" width="100%"> + <caption align="top"> + <em>Null Header Message</em> + </caption> + <tbody><tr align="center"> + <th width="25%"></th> + <th width="25%"></th> + <th width="25%"></th> + <th width="25%"></th> + </tr> + + <tr align="center"> + <td colspan="2"><em>Message Type:</em> 0x0000</td> + <td colspan="2"><em>Message Data Size:</em> 144</td> + </tr> + <tr align="center"> + <td colspan="1"><em>Flags:</em> 0x00</td> + <td colspan="3"><em>Reserved:</em> 0</td> + </tr> + </tbody></table> + </td> + </tr> + </tbody></table> + </center> +<br> +<pre> <code> +%h5debug example2.h5 976 + +New address: 976 +Reading signature at address 976 (rel) +Object Header... +Dirty: 0 +Version: 1 +Header size (in bytes): 16 +Number of links: 1 +Number of messages (allocated): 6 (32) +Number of chunks (allocated): 1 (8) +Chunk 0... + Dirty: 0 + Address: 992 + Size in bytes: 256 +Message 0... + Message ID (sequence number): 0x0005 `fill_new' (0) + Shared: No + Constant: Yes + Raw size in obj header: 8 bytes + Chunk number: 0 + Message Information: + Version: 1 + Space Allocation Time: Late + Fill Time: On Allocation + Fill Value Defined: Undefined + Size: 0 + Data type: <dataset type=""> +Message 1... + Message ID (sequence number): 0x0003 data_type(0) + Shared message: No + Constant: Yes + Raw size in obj header: 16 bytes + Chunk number: 0 + Message Information: + Type class: integer + Size: 4 bytes + Byte order: little endian + Precision: 32 bits + Offset: 0 bits + Low pad type: zero + High pad type: zero + Sign scheme: 2's comp +Message 2... + Message ID (sequence number): 0x0001 simple_dspace(0) + Shared message: No + Constant: No + Raw size in obj header: 8 bytes + Chunk number: 0 + Message Information: + Rank: 0 +Message 3... + Message ID (sequence number): 0x0008 layout(0) + Shared message: No + Constant: No + Raw size in obj header: 24 bytes + Chunk number: 0 + Message Information: + Data address: UNDEF + Number of dimensions: 1 + Size: {4} +Message 4... + Message ID (sequence number): 0x0012 mtime_new(0) + Shared message: No + Constant: No + Raw size in obj header: 8 bytes + Chunk number: 0 + Message Information: + Time: 2003-03-05 14:52:00 CST +Message 5... + Message ID (sequence number): 0x0000 null(0) + Shared message: No + Constant: No + Raw size in obj header: 144 bytes + Chunk number: 0 + Message Information: + <no info="" for="" this="" message=""> +</no></dataset></code> </pre> + +<p></p> + +</li></ol> + + + +</body></html> + </div></div><!-- contents --> +</div><!-- PageDoc --> +</div><!-- doc-content --> +<!-- start footer part --> +<div id="nav-path" class="navpath"><!-- id is needed for treeview function! --> + <ul> + <li class="footer">Generated by + <a href="http://www.doxygen.org/index.html"> + <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.9.1 </li> + </ul> +</div> +</body> +</html> |