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<div id="projectname">openNURBS SDK Help
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 <span id="projectnumber">6.0</span>
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<a href="#pub-types">Public Types</a> |
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<a href="#pub-static-methods">Static Public Member Functions</a> |
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<a href="../../d5/d53/class_o_n___buffer-members.html">List of all members</a> </div>
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<div class="title">ON_Buffer Class Reference</div> </div>
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<p><code>#include <<a class="el" href="../../d3/dad/opennurbs__archive_8h_source.html">opennurbs_archive.h</a>></code></p>
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<table class="memberdecls">
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Public Types</h2></td></tr>
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<tr class="memitem:a52f93f0eb0f5e0e1dd18fc21c60daf6e"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom">{ <a class="el" href="../../df/d05/class_o_n___buffer.html#a52f93f0eb0f5e0e1dd18fc21c60daf6ea352b035d364af17d28160dc99afd5198">seek_from_beginning_of_file</a> = 0,
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<a class="el" href="../../df/d05/class_o_n___buffer.html#a52f93f0eb0f5e0e1dd18fc21c60daf6eab6ccec3d4f760ef1d489adb65b9d9529">seek_from_current_position</a> = 1,
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<a class="el" href="../../df/d05/class_o_n___buffer.html#a52f93f0eb0f5e0e1dd18fc21c60daf6ea7e9c8bb05c0e70b98af45f70ca29138c">seek_from_end_of_file</a> = 2
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}</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
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Public Member Functions</h2></td></tr>
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<tr class="memitem:a73055465dda25f22d75ad5587a5bdabd"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#a73055465dda25f22d75ad5587a5bdabd">ON_Buffer</a> ()</td></tr>
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<tr class="separator:a73055465dda25f22d75ad5587a5bdabd"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a04b4b2453dc5ac21eed0fcdd93b44772"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#a04b4b2453dc5ac21eed0fcdd93b44772">ON_Buffer</a> (const <a class="el" href="../../df/d05/class_o_n___buffer.html">ON_Buffer</a> &src)</td></tr>
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<tr class="separator:a04b4b2453dc5ac21eed0fcdd93b44772"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:aa7681288987d91c8a4816b6dc8c64cc2"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#aa7681288987d91c8a4816b6dc8c64cc2">~ON_Buffer</a> ()</td></tr>
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<tr class="separator:aa7681288987d91c8a4816b6dc8c64cc2"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a399e0b3b25725f8b64e3d0113102fe4f"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#a399e0b3b25725f8b64e3d0113102fe4f">AtEnd</a> () const</td></tr>
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<tr class="separator:a399e0b3b25725f8b64e3d0113102fe4f"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ac771b73243d8a308765a5d2e53f6a041"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#ac771b73243d8a308765a5d2e53f6a041">ChangeSize</a> (ON__UINT64 buffer_size)</td></tr>
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<tr class="separator:ac771b73243d8a308765a5d2e53f6a041"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a774b8d06f510e12889725affe1e750bc"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#a774b8d06f510e12889725affe1e750bc">ClearLastError</a> ()</td></tr>
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<tr class="separator:a774b8d06f510e12889725affe1e750bc"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ab419542485bc354732e11b6134c1de2b"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#ab419542485bc354732e11b6134c1de2b">Compact</a> ()</td></tr>
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<tr class="separator:ab419542485bc354732e11b6134c1de2b"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a962c3308c3d85963642c0ca1242d0ac7"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#a962c3308c3d85963642c0ca1242d0ac7">Compress</a> (<a class="el" href="../../df/d05/class_o_n___buffer.html">ON_Buffer</a> &compressed_buffer) const</td></tr>
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<tr class="separator:a962c3308c3d85963642c0ca1242d0ac7"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a63d1193d7082b2272f46e63bc791871b"><td class="memItemLeft" align="right" valign="top">ON__UINT32 </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#a63d1193d7082b2272f46e63bc791871b">CRC32</a> (ON__UINT32 current_remainder) const</td></tr>
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<tr class="separator:a63d1193d7082b2272f46e63bc791871b"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:aa5c119332f2df68db38bc7046db3cdb0"><td class="memItemLeft" align="right" valign="top">ON__UINT64 </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#aa5c119332f2df68db38bc7046db3cdb0">CurrentPosition</a> () const</td></tr>
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<tr class="separator:aa5c119332f2df68db38bc7046db3cdb0"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a5990b13e4e91ff7104c12e41e3f681cf"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#a5990b13e4e91ff7104c12e41e3f681cf">Destroy</a> ()</td></tr>
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<tr class="separator:a5990b13e4e91ff7104c12e41e3f681cf"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a3b92dc6a987dd14b5867a8d594b5d54c"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#a3b92dc6a987dd14b5867a8d594b5d54c">EmergencyDestroy</a> ()</td></tr>
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<tr class="separator:a3b92dc6a987dd14b5867a8d594b5d54c"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ae6278023f2d2b8f6b52094b855fbdd66"><td class="memItemLeft" align="right" valign="top">ON_Buffer_ErrorHandler </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#ae6278023f2d2b8f6b52094b855fbdd66">ErrorHandler</a> () const</td></tr>
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<tr class="separator:ae6278023f2d2b8f6b52094b855fbdd66"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a527b9b97d73a3f361966f11004c77b8c"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#a527b9b97d73a3f361966f11004c77b8c">IsValid</a> (const <a class="el" href="../../d2/da3/class_o_n___text_log.html">ON_TextLog</a> *text_log) const</td></tr>
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<tr class="separator:a527b9b97d73a3f361966f11004c77b8c"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a4eeec7923b5c00ac2a930f1ca22bc313"><td class="memItemLeft" align="right" valign="top">ON__UINT32 </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#a4eeec7923b5c00ac2a930f1ca22bc313">LastError</a> () const</td></tr>
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<tr class="separator:a4eeec7923b5c00ac2a930f1ca22bc313"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a8f94576d2644d545412748f3f47b4e02"><td class="memItemLeft" align="right" valign="top"><a class="el" href="../../df/d05/class_o_n___buffer.html">ON_Buffer</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#a8f94576d2644d545412748f3f47b4e02">operator=</a> (const <a class="el" href="../../df/d05/class_o_n___buffer.html">ON_Buffer</a> &src)</td></tr>
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<tr class="separator:a8f94576d2644d545412748f3f47b4e02"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ade07e24604407bc13946604493190852"><td class="memItemLeft" align="right" valign="top">ON__UINT64 </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#ade07e24604407bc13946604493190852">Read</a> (ON__UINT64 size, void *buffer)</td></tr>
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<tr class="separator:ade07e24604407bc13946604493190852"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:aa2f22301086b369308341e48c2bc70bd"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#aa2f22301086b369308341e48c2bc70bd">ReadFromBinaryArchive</a> (<a class="el" href="../../db/d16/class_o_n___binary_archive.html">ON_BinaryArchive</a> &)</td></tr>
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<tr class="separator:aa2f22301086b369308341e48c2bc70bd"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ab21bb47895df1d9c1ac028d7e980ed95"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#ab21bb47895df1d9c1ac028d7e980ed95">Seek</a> (ON__INT64 offset, int origin)</td></tr>
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<tr class="separator:ab21bb47895df1d9c1ac028d7e980ed95"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ae09b0bd4c728a0f2b7f4eb97e97dce48"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#ae09b0bd4c728a0f2b7f4eb97e97dce48">SeekFromCurrentPosition</a> (ON__INT64 offset)</td></tr>
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<tr class="separator:ae09b0bd4c728a0f2b7f4eb97e97dce48"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:abf4319efff0ec798728edd44f306ed13"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#abf4319efff0ec798728edd44f306ed13">SeekFromEnd</a> (ON__INT64 offset)</td></tr>
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<tr class="separator:abf4319efff0ec798728edd44f306ed13"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ac34b4ecc81c3f8ab7b0d591977b1f689"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#ac34b4ecc81c3f8ab7b0d591977b1f689">SeekFromStart</a> (ON__INT64 offset)</td></tr>
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<tr class="separator:ac34b4ecc81c3f8ab7b0d591977b1f689"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a3c6413b608628fb3147238e39922f91d"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#a3c6413b608628fb3147238e39922f91d">SetErrorHandler</a> (ON_Buffer_ErrorHandler error_handler)</td></tr>
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<tr class="separator:a3c6413b608628fb3147238e39922f91d"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ad3b0f5eb7718c67ab6c741733ff520d2"><td class="memItemLeft" align="right" valign="top">ON__UINT64 </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#ad3b0f5eb7718c67ab6c741733ff520d2">Size</a> () const</td></tr>
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<tr class="separator:ad3b0f5eb7718c67ab6c741733ff520d2"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a4aff04cf9629d75cd859d93f4f801cf8"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#a4aff04cf9629d75cd859d93f4f801cf8">Uncompress</a> (<a class="el" href="../../df/d05/class_o_n___buffer.html">ON_Buffer</a> &uncompressed_buffer) const</td></tr>
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<tr class="separator:a4aff04cf9629d75cd859d93f4f801cf8"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a7484357266d9bb7546d27f24ac96fe2d"><td class="memItemLeft" align="right" valign="top">ON__UINT64 </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#a7484357266d9bb7546d27f24ac96fe2d">Write</a> (ON__UINT64 size, const void *buffer)</td></tr>
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<tr class="separator:a7484357266d9bb7546d27f24ac96fe2d"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a6ec84100d33a87ed3dc327166405717a"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#a6ec84100d33a87ed3dc327166405717a">WriteToBinaryArchive</a> (<a class="el" href="../../db/d16/class_o_n___binary_archive.html">ON_BinaryArchive</a> &) const</td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-methods"></a>
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Static Public Member Functions</h2></td></tr>
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<tr class="memitem:a168da7c4e4572c07a7ecc27006b92a28"><td class="memItemLeft" align="right" valign="top">static int </td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/d05/class_o_n___buffer.html#a168da7c4e4572c07a7ecc27006b92a28">Compare</a> (const <a class="el" href="../../df/d05/class_o_n___buffer.html">ON_Buffer</a> &a, const <a class="el" href="../../df/d05/class_o_n___buffer.html">ON_Buffer</a> &b)</td></tr>
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</table>
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<h2 class="groupheader">Member Enumeration Documentation</h2>
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<a id="a52f93f0eb0f5e0e1dd18fc21c60daf6e"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a52f93f0eb0f5e0e1dd18fc21c60daf6e">◆ </a></span>anonymous enum</h2>
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<td class="memname">anonymous enum</td>
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</div><div class="memdoc">
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<table class="fieldtable">
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<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="a52f93f0eb0f5e0e1dd18fc21c60daf6ea352b035d364af17d28160dc99afd5198"></a>seek_from_beginning_of_file </td><td class="fielddoc"></td></tr>
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<tr><td class="fieldname"><a id="a52f93f0eb0f5e0e1dd18fc21c60daf6eab6ccec3d4f760ef1d489adb65b9d9529"></a>seek_from_current_position </td><td class="fielddoc"></td></tr>
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<tr><td class="fieldname"><a id="a52f93f0eb0f5e0e1dd18fc21c60daf6ea7e9c8bb05c0e70b98af45f70ca29138c"></a>seek_from_end_of_file </td><td class="fielddoc"></td></tr>
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<h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<a id="a73055465dda25f22d75ad5587a5bdabd"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a73055465dda25f22d75ad5587a5bdabd">◆ </a></span>ON_Buffer() <span class="overload">[1/2]</span></h2>
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<td class="memname">ON_Buffer::ON_Buffer </td>
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<h2 class="memtitle"><span class="permalink"><a href="#aa7681288987d91c8a4816b6dc8c64cc2">◆ </a></span>~ON_Buffer()</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a04b4b2453dc5ac21eed0fcdd93b44772">◆ </a></span>ON_Buffer() <span class="overload">[2/2]</span></h2>
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<h2 class="groupheader">Member Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a399e0b3b25725f8b64e3d0113102fe4f">◆ </a></span>AtEnd()</h2>
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<p>Returns: True if <a class="el" href="../../df/d05/class_o_n___buffer.html#ad3b0f5eb7718c67ab6c741733ff520d2">Size()</a> == <a class="el" href="../../df/d05/class_o_n___buffer.html#aa5c119332f2df68db38bc7046db3cdb0">CurrentPosition()</a>. Remarks: It is possible to seek beyond the end of the buffer. In this case, the current position will be past the end of the buffer and <a class="el" href="../../df/d05/class_o_n___buffer.html#a399e0b3b25725f8b64e3d0113102fe4f">AtEnd()</a> will return false. </p>
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<p>Parameters: buffer_size - [in] new size of buffer. Returns: True if successful. Remarks: The current position is not changed and may be beyond the end of the file. Use Seek to set the current position after calling <a class="el" href="../../df/d05/class_o_n___buffer.html#ac771b73243d8a308765a5d2e53f6a041">ChangeSize()</a>. </p>
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<p>Description: Return unused memory to heap. Remarks: Call this function after creating an <a class="el" href="../../df/d05/class_o_n___buffer.html">ON_Buffer</a> that will persist for and extended amount of time. There are never more than 16 pages of unsued memory (16*4096 bytes on most computers) in an <a class="el" href="../../df/d05/class_o_n___buffer.html">ON_Buffer</a>. <a class="el" href="../../df/d05/class_o_n___buffer.html#ab419542485bc354732e11b6134c1de2b">Compact()</a> can be called at any time, but calling <a class="el" href="../../df/d05/class_o_n___buffer.html#ab419542485bc354732e11b6134c1de2b">Compact()</a> the then writing at the end of the buffer is not an efficient use of time or memory. </p>
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<p>Description: Compare contents of buffers. Paramters: a - [in] b - [in] Returns: -1: a < b 0: a == b 1: a > b </p>
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<p>Description: Compress this buffer</p>
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<p>Returns: 32-bit CRC of the buffer contents. Remarks: </p>
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<p>Returns: Current position in the buffer. Remarks: It is possible to seek beyond the end of the buffer. In this case, the current position will be past the end of the buffer and <a class="el" href="../../df/d05/class_o_n___buffer.html#aa5c119332f2df68db38bc7046db3cdb0">CurrentPosition()</a> will be greater than <a class="el" href="../../df/d05/class_o_n___buffer.html#ad3b0f5eb7718c67ab6c741733ff520d2">Size()</a>. </p>
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<p>Returns: Value that identifies most recent error. 0: no error 1: attempt to seek to a negative position </p>
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<p>Parameters: size - [in] number of bytes to read. buffer - [out] read values are returned in buffer. Returns: Number of bytes read into buffer. For example, if <a class="el" href="../../df/d05/class_o_n___buffer.html#aa5c119332f2df68db38bc7046db3cdb0">CurrentPosition()</a> <= <a class="el" href="../../df/d05/class_o_n___buffer.html#ad3b0f5eb7718c67ab6c741733ff520d2">Size()</a> and size > (<a class="el" href="../../df/d05/class_o_n___buffer.html#ad3b0f5eb7718c67ab6c741733ff520d2">Size()</a> - <a class="el" href="../../df/d05/class_o_n___buffer.html#aa5c119332f2df68db38bc7046db3cdb0">CurrentPosition()</a>) and buffer is not null, then the value (<a class="el" href="../../df/d05/class_o_n___buffer.html#ad3b0f5eb7718c67ab6c741733ff520d2">Size()</a> - <a class="el" href="../../df/d05/class_o_n___buffer.html#aa5c119332f2df68db38bc7046db3cdb0">CurrentPosition()</a>) is returned. Remarks: If the size parameter is zero, then nothing is done. When <a class="el" href="../../df/d05/class_o_n___buffer.html#aa5c119332f2df68db38bc7046db3cdb0">CurrentPosition()</a> <= <a class="el" href="../../df/d05/class_o_n___buffer.html#ad3b0f5eb7718c67ab6c741733ff520d2">Size()</a>, attempts to read more than (<a class="el" href="../../df/d05/class_o_n___buffer.html#ad3b0f5eb7718c67ab6c741733ff520d2">Size()</a> - <a class="el" href="../../df/d05/class_o_n___buffer.html#aa5c119332f2df68db38bc7046db3cdb0">CurrentPosition()</a>) bytes do not generate an error. When <a class="el" href="../../df/d05/class_o_n___buffer.html#aa5c119332f2df68db38bc7046db3cdb0">CurrentPosition()</a> > <a class="el" href="../../df/d05/class_o_n___buffer.html#ad3b0f5eb7718c67ab6c741733ff520d2">Size()</a>, any attempt to read generates an error. </p>
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<p>Description: Use <a class="el" href="../../df/d05/class_o_n___buffer.html#aa2f22301086b369308341e48c2bc70bd">ReadFromBinaryArchive()</a> to retrieve an entire <a class="el" href="../../df/d05/class_o_n___buffer.html">ON_Buffer</a> that was written using <a class="el" href="../../df/d05/class_o_n___buffer.html#a6ec84100d33a87ed3dc327166405717a">WriteToBinaryArchive()</a>. </p>
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<a id="ab21bb47895df1d9c1ac028d7e980ed95"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ab21bb47895df1d9c1ac028d7e980ed95">◆ </a></span>Seek()</h2>
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<td class="memname">bool ON_Buffer::Seek </td>
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<td>(</td>
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<td class="paramtype">ON__INT64 </td>
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<td class="paramname"><em>offset</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">int </td>
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<td class="paramname"><em>origin</em> </td>
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<td>)</td>
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<p>Parameters: offset - [in] number of bytes to seek from origin origin - [in] initial position. 0 (SEEK_SET) Seek from beginning of file. 1 (SEEK_CUR) Seek from current position. 2 (SEEK_END) Seek from end of file. Returns: True if successful. False if the seek would result in a file position before the beginning of the file. If false is returned, the current position is not changed. Remarks: Seeking beyond the end of the buffer is succeeds. Seeking before the beginning of the buffer fails. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#ae09b0bd4c728a0f2b7f4eb97e97dce48">◆ </a></span>SeekFromCurrentPosition()</h2>
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<td class="memname">bool ON_Buffer::SeekFromCurrentPosition </td>
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<td>(</td>
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<td class="paramtype">ON__INT64 </td>
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<td class="paramname"><em>offset</em></td><td>)</td>
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<p>Parameters: offset - [in] number of bytes to seek from the current position. Returns: True if successful. False if the seek would result in a file position before the beginning of the file. If false is returned, the current position is not changed. Remarks: Seeking beyond the end of the buffer is succeeds. Seeking before the beginning of the buffer fails. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#abf4319efff0ec798728edd44f306ed13">◆ </a></span>SeekFromEnd()</h2>
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<td class="memname">bool ON_Buffer::SeekFromEnd </td>
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<td>(</td>
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<td class="paramtype">ON__INT64 </td>
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<td class="paramname"><em>offset</em></td><td>)</td>
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<p>Parameters: offset - [in] number of bytes to seek from the end fo the buffer. Returns: True if successful. False if the seek would result in a file position before the beginning of the file. If false is returned, the current position is not changed. Remarks: Seeking beyond the end of the buffer is succeeds. Seeking before the beginning of the buffer fails. </p>
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<a id="ac34b4ecc81c3f8ab7b0d591977b1f689"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ac34b4ecc81c3f8ab7b0d591977b1f689">◆ </a></span>SeekFromStart()</h2>
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<td class="memname">bool ON_Buffer::SeekFromStart </td>
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<td>(</td>
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<td class="paramtype">ON__INT64 </td>
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<td class="paramname"><em>offset</em></td><td>)</td>
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<p>Parameters: offset - [in] (>= 0) number of bytes to seek from the start of the buffer. Returns: True if successful. False if the seek would result in a file position before the beginning of the file. If false is returned, the current position is not changed. Remarks: Seeking beyond the end of the buffer is succeeds. Seeking before the beginning of the buffer fails. </p>
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<a id="a3c6413b608628fb3147238e39922f91d"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a3c6413b608628fb3147238e39922f91d">◆ </a></span>SetErrorHandler()</h2>
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<td class="memname">void ON_Buffer::SetErrorHandler </td>
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<td>(</td>
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<td class="paramname"><em>error_handler</em></td><td>)</td>
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<h2 class="memtitle"><span class="permalink"><a href="#ad3b0f5eb7718c67ab6c741733ff520d2">◆ </a></span>Size()</h2>
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<td class="memname">ON__UINT64 ON_Buffer::Size </td>
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<p>Returns: Number of bytes currently in the buffer. Remarks: It is possible to seek beyond the end of the buffer. In this case, the current position will be past the end of the buffer and <a class="el" href="../../df/d05/class_o_n___buffer.html#aa5c119332f2df68db38bc7046db3cdb0">CurrentPosition()</a> will be greater than <a class="el" href="../../df/d05/class_o_n___buffer.html#ad3b0f5eb7718c67ab6c741733ff520d2">Size()</a>. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a4aff04cf9629d75cd859d93f4f801cf8">◆ </a></span>Uncompress()</h2>
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<td class="memname">bool ON_Buffer::Uncompress </td>
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<td>(</td>
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<td class="paramname"><em>uncompressed_buffer</em></td><td>)</td>
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<p>Description: Uncompress this buffer which must have been compressed using <a class="el" href="../../df/d05/class_o_n___buffer.html#a962c3308c3d85963642c0ca1242d0ac7">ON_Buffer::Compress()</a>.</p>
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<p>Parameters: uncompressed_buffer - [out] (The reference can be *this)</p>
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<p>Example: / silly example that compresses and then uncompresses a buffer in place / to show how to call the functions. <a class="el" href="../../df/d05/class_o_n___buffer.html">ON_Buffer</a> buffer; buffer = ...; ///< buffer is in it uncompressed form if ( buffer.Compress(buffer) ) { / buffer is now compressed if ( buffer.Uncompress(buffer) ) { / buffer is uncompressed again. } }</p>
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<p>Returns: True if successful. False if failed. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a7484357266d9bb7546d27f24ac96fe2d">◆ </a></span>Write()</h2>
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<td class="memname">ON__UINT64 ON_Buffer::Write </td>
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<td>(</td>
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<td class="paramname"><em>size</em>, </td>
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<td class="paramtype">const void * </td>
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<td class="paramname"><em>buffer</em> </td>
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<p>Parameters: size - [in] number of bytes to write. buffer - [in] values to write. Returns: Number of bytes written buffer. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a6ec84100d33a87ed3dc327166405717a">◆ </a></span>WriteToBinaryArchive()</h2>
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<td class="memname">bool ON_Buffer::WriteToBinaryArchive </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="../../db/d16/class_o_n___binary_archive.html">ON_BinaryArchive</a> & </td>
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<p>Description: Use <a class="el" href="../../df/d05/class_o_n___buffer.html#a6ec84100d33a87ed3dc327166405717a">WriteToBinaryArchive()</a> to save an entire <a class="el" href="../../df/d05/class_o_n___buffer.html">ON_Buffer</a> inside a binary archive. Use <a class="el" href="../../df/d05/class_o_n___buffer.html#aa2f22301086b369308341e48c2bc70bd">ReadFromBinaryArchive()</a> to retrieve the <a class="el" href="../../df/d05/class_o_n___buffer.html">ON_Buffer</a> from the <a class="el" href="../../db/d16/class_o_n___binary_archive.html" title="< use for generic serialization of binary data ">ON_BinaryArchive</a>. </p>
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