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<hr><h1>src/header_tag.cpp</h1><a href="header__tag_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 <font class="comment">// $Id: header_tag.cpp,v 1.21 2000/10/29 01:37:29 eldamitri Exp $</font>
00002 
00003 <font class="comment">// id3lib: a C++ library for creating and manipulating id3v1/v2 tags</font>
00004 <font class="comment">// Copyright 1999, 2000  Scott Thomas Haug</font>
00005 
00006 <font class="comment">// This library is free software; you can redistribute it and/or modify it</font>
00007 <font class="comment">// under the terms of the GNU Library General Public License as published by</font>
00008 <font class="comment">// the Free Software Foundation; either version 2 of the License, or (at your</font>
00009 <font class="comment">// option) any later version.</font>
00010 <font class="comment">//</font>
00011 <font class="comment">// This library is distributed in the hope that it will be useful, but WITHOUT</font>
00012 <font class="comment">// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or</font>
00013 <font class="comment">// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public</font>
00014 <font class="comment">// License for more details.</font>
00015 <font class="comment">//</font>
00016 <font class="comment">// You should have received a copy of the GNU Library General Public License</font>
00017 <font class="comment">// along with this library; if not, write to the Free Software Foundation,</font>
00018 <font class="comment">// Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.</font>
00019 
00020 <font class="comment">// The id3lib authors encourage improvements and optimisations to be sent to</font>
00021 <font class="comment">// the id3lib coordinator.  Please see the README file for details on where to</font>
00022 <font class="comment">// send such submissions.  See the AUTHORS file for a list of people who have</font>
00023 <font class="comment">// contributed to id3lib.  See the ChangeLog file for a list of changes to</font>
00024 <font class="comment">// id3lib.  These files are distributed with id3lib at</font>
00025 <font class="comment">// http://download.sourceforge.net/id3lib/</font>
00026 
00027 <font class="preprocessor">#if defined HAVE_CONFIG_H</font>
00028 <font class="preprocessor"></font><font class="preprocessor">#include &lt;config.h&gt;</font>
00029 <font class="preprocessor">#endif</font>
00030 <font class="preprocessor"></font>
00031 
00032 
00033 <font class="preprocessor">#include &lt;string.h&gt;</font>
00034 
00035 <font class="preprocessor">#include "<a class="code" href="header__tag_8h.html">header_tag.h</a>"</font>
00036 <font class="preprocessor">#include "utils.h"</font>
00037 <font class="preprocessor">#include "<a class="code" href="tag_8h.html">tag.h</a>"</font>
00038 <font class="preprocessor">#include "io_helpers.h"</font>
00039 <font class="preprocessor">#include "<a class="code" href="spec_8h.html">spec.h</a>"</font>
00040 
00041 <font class="keyword">using</font> <font class="keyword">namespace </font>dami;
00042 
<a name="l00043"></a><a class="code" href="class_i_d3___tag_header.html#p0">00043</a> <font class="keyword">const</font> <font class="keywordtype">char</font>* <font class="keyword">const</font> <a class="code" href="class_i_d3___tag_header.html#p0">ID3_TagHeader::ID</a> = <font class="stringliteral">"ID3"</font>;
00044 
<a name="l00045"></a><a class="code" href="class_i_d3___tag_header.html#a3">00045</a> <font class="keywordtype">bool</font> <a class="code" href="class_i_d3___tag_header.html#a3">ID3_TagHeader::SetSpec</a>(<a class="code" href="globals_8h.html#a216">ID3_V2Spec</a> spec)
00046 {
00047   <font class="keywordtype">bool</font> changed = this-&gt;<a class="code" href="class_i_d3___header.html#a2">ID3_Header::SetSpec</a>(spec);
00048   <font class="keywordflow">if</font> (changed)
00049   {
00050     <font class="keywordflow">if</font> (_info)
00051     {
00052       <a class="code" href="class_i_d3___header.html#n2">_flags</a>.<a class="code" href="class_i_d3___flags.html#a4">set</a>(<a class="code" href="class_i_d3___tag_header.html#s9s2">EXPERIMENTAL</a>, <a class="code" href="class_i_d3___header.html#n3">_info</a>-&gt;is_experimental);
00053       <a class="code" href="class_i_d3___header.html#n2">_flags</a>.<a class="code" href="class_i_d3___flags.html#a4">set</a>(<a class="code" href="class_i_d3___tag_header.html#s9s1">EXTENDED</a>,     <a class="code" href="class_i_d3___header.html#n3">_info</a>-&gt;is_extended);
00054     }
00055   }
00056   <font class="keywordflow">return</font> changed;
00057 }
00058 
<a name="l00059"></a><a class="code" href="class_i_d3___tag_header.html#a4">00059</a> size_t <a class="code" href="class_i_d3___tag_header.html#a4">ID3_TagHeader::Size</a>()<font class="keyword"> const</font>
00060 <font class="keyword"></font>{
00061   size_t bytesUsed = <a class="code" href="class_i_d3___tag_header.html#s10s8">ID3_TagHeader::SIZE</a>;
00062   
00063   <font class="keywordflow">if</font> (<a class="code" href="class_i_d3___header.html#n3">_info</a>-&gt;is_extended)
00064   {
00065     bytesUsed += <a class="code" href="class_i_d3___header.html#n3">_info</a>-&gt;extended_bytes + <font class="keyword">sizeof</font>(uint32);
00066   }
00067   
00068   <font class="keywordflow">return</font> bytesUsed;
00069 }
00070 
00071 
<a name="l00072"></a><a class="code" href="class_i_d3___tag_header.html#a5">00072</a> <font class="keywordtype">void</font> <a class="code" href="class_i_d3___tag_header.html#a5">ID3_TagHeader::Render</a>(<a class="code" href="class_i_d3___writer.html">ID3_Writer</a>&amp; writer)<font class="keyword"> const</font>
00073 <font class="keyword"></font>{
00074   writer.<a class="code" href="class_i_d3___writer.html#a8">writeChars</a>((<a class="code" href="globals_8h.html#a33">uchar</a> *) <a class="code" href="class_i_d3___tag_header.html#p0">ID</a>, strlen(<a class="code" href="class_i_d3___tag_header.html#p0">ID</a>));
00075 
00076   writer.<a class="code" href="class_i_d3___writer.html#a7">writeChar</a>(<a class="code" href="spec_8h.html#a1">ID3_V2SpecToVer</a>(<a class="code" href="globals_8h.html#a216a58">ID3V2_LATEST</a>));
00077   writer.<a class="code" href="class_i_d3___writer.html#a7">writeChar</a>(<a class="code" href="spec_8h.html#a2">ID3_V2SpecToRev</a>(<a class="code" href="globals_8h.html#a216a58">ID3V2_LATEST</a>));
00078   
00079   <font class="comment">// set the flags byte in the header</font>
00080   writer.<a class="code" href="class_i_d3___writer.html#a7">writeChar</a>(static_cast&lt;uchar&gt;(<a class="code" href="class_i_d3___header.html#n2">_flags</a>.<a class="code" href="class_i_d3___flags.html#a2">get</a>() &amp; <a class="code" href="globals_8h.html#a19">MASK8</a>));
00081   io::writeUInt28(writer, this-&gt;GetDataSize());
00082 
00083   <font class="comment">// now we render the extended header</font>
00084   <font class="keywordflow">if</font> (<a class="code" href="class_i_d3___header.html#n2">_flags</a>.<a class="code" href="class_i_d3___flags.html#a3">test</a>(<a class="code" href="class_i_d3___tag_header.html#s9s1">EXTENDED</a>))
00085   {
00086     io::writeBENumber(writer, <a class="code" href="class_i_d3___header.html#n3">_info</a>-&gt;extended_bytes, <font class="keyword">sizeof</font>(<a class="code" href="sized__types_8h.html#a4">uint32</a>));
00087   }
00088 }
00089 
<a name="l00090"></a><a class="code" href="class_i_d3___tag_header.html#a6">00090</a> <font class="keywordtype">bool</font> <a class="code" href="class_i_d3___tag_header.html#a6">ID3_TagHeader::Parse</a>(<a class="code" href="class_i_d3___reader.html">ID3_Reader</a>&amp; reader)
00091 {
00092   io::ExitTrigger et(reader);
00093   <font class="keywordflow">if</font> (!<a class="code" href="class_i_d3___tag.html#d0">ID3_Tag::IsV2Tag</a>(reader))
00094   {
00095     ID3D_NOTICE( <font class="stringliteral">"ID3_TagHeader::Parse(): not an id3v2 header"</font> );
00096     <font class="keywordflow">return</font> <font class="keyword">false</font>;
00097   }
00098 
00099   <a class="code" href="globals_8h.html#a33">uchar</a> id[3];
00100   reader.<a class="code" href="class_i_d3___reader.html#a7">readChars</a>(id, 3);
00101   <font class="comment">// The spec version is determined with the MAJOR and MINOR OFFSETs</font>
00102   <a class="code" href="globals_8h.html#a33">uchar</a> major = reader.<a class="code" href="class_i_d3___reader.html#a5">readChar</a>();
00103   <a class="code" href="globals_8h.html#a33">uchar</a> minor = reader.<a class="code" href="class_i_d3___reader.html#a5">readChar</a>();
00104   this-&gt;<a class="code" href="class_i_d3___tag_header.html#a3">SetSpec</a>(<a class="code" href="spec_8h.html#a0">ID3_VerRevToV2Spec</a>(major, minor));
00105 
00106   <font class="comment">// Get the flags at the appropriate offset</font>
00107   <a class="code" href="class_i_d3___header.html#n2">_flags</a>.<a class="code" href="class_i_d3___flags.html#a4">set</a>(static_cast&lt;ID3_Flags::TYPE&gt;(reader.<a class="code" href="class_i_d3___reader.html#a5">readChar</a>()));
00108 
00109   <font class="comment">// set the data size</font>
00110   this-&gt;<a class="code" href="class_i_d3___header.html#a4">SetDataSize</a>(io::readUInt28(reader));
00111   
00112   <font class="keywordflow">if</font> (<a class="code" href="class_i_d3___header.html#n2">_flags</a>.<a class="code" href="class_i_d3___flags.html#a3">test</a>(<a class="code" href="class_i_d3___tag_header.html#s9s1">EXTENDED</a>))
00113   {
00114     <font class="keywordflow">if</font> (this-&gt;<a class="code" href="class_i_d3___header.html#a3">GetSpec</a>() == <a class="code" href="globals_8h.html#a216a54">ID3V2_2_1</a>)
00115     {
00116       <font class="comment">// okay, if we are ID3v2.2.1, then let's skip over the extended header</font>
00117       <font class="comment">// for now because I am lazy</font>
00118     }
00119 
00120     <font class="keywordflow">if</font> (this-&gt;<a class="code" href="class_i_d3___header.html#a3">GetSpec</a>() == <a class="code" href="globals_8h.html#a216a55">ID3V2_3_0</a>)
00121     {
00122       <font class="comment">// okay, if we are ID3v2.3.0, then let's actually parse the extended</font>
00123       <font class="comment">// header (for now, we skip it because we are lazy)</font>
00124     }
00125   }
00126   et.setExitPos(reader.<a class="code" href="class_i_d3___reader.html#a3">getCur</a>());
00127   <font class="keywordflow">return</font> <font class="keyword">true</font>;
00128 }
</pre></div><hr><address><small>Generated on Thu Jan 3 07:35:55 2002 for id3lib by
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.gif" alt="doxygen" align="middle" border=0 
width=110 height=53></a>1.2.12 written by <a href="mailto:dimitri@stack.nl">Dimitri van Heesch</a>,
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