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<h1>src/frame_render.cpp</h1><a href="frame__render_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// $Id: frame_render.cpp,v 1.27 2002/07/31 13:45:18 t1mpy Exp $</span>
<a name="l00002"></a>00002
<a name="l00003"></a>00003 <span class="comment">// id3lib: a C++ library for creating and manipulating id3v1/v2 tags</span>
<a name="l00004"></a>00004 <span class="comment">// Copyright 1999, 2000 Scott Thomas Haug</span>
<a name="l00005"></a>00005 <span class="comment">// Copyright 2002 Thijmen Klok (thijmen@id3lib.org)</span>
<a name="l00006"></a>00006
<a name="l00007"></a>00007 <span class="comment">// This library is free software; you can redistribute it and/or modify it</span>
<a name="l00008"></a>00008 <span class="comment">// under the terms of the GNU Library General Public License as published by</span>
<a name="l00009"></a>00009 <span class="comment">// the Free Software Foundation; either version 2 of the License, or (at your</span>
<a name="l00010"></a>00010 <span class="comment">// option) any later version.</span>
<a name="l00011"></a>00011 <span class="comment">//</span>
<a name="l00012"></a>00012 <span class="comment">// This library is distributed in the hope that it will be useful, but WITHOUT</span>
<a name="l00013"></a>00013 <span class="comment">// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or</span>
<a name="l00014"></a>00014 <span class="comment">// FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public</span>
<a name="l00015"></a>00015 <span class="comment">// License for more details.</span>
<a name="l00016"></a>00016 <span class="comment">//</span>
<a name="l00017"></a>00017 <span class="comment">// You should have received a copy of the GNU Library General Public License</span>
<a name="l00018"></a>00018 <span class="comment">// along with this library; if not, write to the Free Software Foundation,</span>
<a name="l00019"></a>00019 <span class="comment">// Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.</span>
<a name="l00020"></a>00020
<a name="l00021"></a>00021 <span class="comment">// The id3lib authors encourage improvements and optimisations to be sent to</span>
<a name="l00022"></a>00022 <span class="comment">// the id3lib coordinator. Please see the README file for details on where to</span>
<a name="l00023"></a>00023 <span class="comment">// send such submissions. See the AUTHORS file for a list of people who have</span>
<a name="l00024"></a>00024 <span class="comment">// contributed to id3lib. See the ChangeLog file for a list of changes to</span>
<a name="l00025"></a>00025 <span class="comment">// id3lib. These files are distributed with id3lib at</span>
<a name="l00026"></a>00026 <span class="comment">// http://download.sourceforge.net/id3lib/</span>
<a name="l00027"></a>00027
<a name="l00028"></a>00028 <span class="preprocessor">#if defined HAVE_CONFIG_H</span>
<a name="l00029"></a>00029 <span class="preprocessor"></span><span class="preprocessor">#include <config.h></span>
<a name="l00030"></a>00030 <span class="preprocessor">#endif</span>
<a name="l00031"></a>00031 <span class="preprocessor"></span>
<a name="l00032"></a>00032
<a name="l00033"></a>00033
<a name="l00034"></a>00034 <span class="comment">//#include <string.h></span>
<a name="l00035"></a>00035 <span class="preprocessor">#include <memory.h></span>
<a name="l00036"></a>00036 <span class="preprocessor">#include <zlib.h></span>
<a name="l00037"></a>00037
<a name="l00038"></a>00038 <span class="preprocessor">#include "<a class="code" href="tag_8h.html">tag.h</a>"</span>
<a name="l00039"></a>00039 <span class="preprocessor">#include "<a class="code" href="frame__impl_8h.html">frame_impl.h</a>"</span>
<a name="l00040"></a>00040 <span class="preprocessor">#include "<a class="code" href="io__decorators_8h.html">id3/io_decorators.h</a>"</span> <span class="comment">//has "readers.h" "io_helpers.h" "utils.h"</span>
<a name="l00041"></a>00041 <span class="preprocessor">#include "<a class="code" href="io__strings_8h.html">io_strings.h</a>"</span>
<a name="l00042"></a>00042 <span class="preprocessor">#include "<a class="code" href="io__helpers_8h.html">io_helpers.h</a>"</span>
<a name="l00043"></a>00043
<a name="l00044"></a>00044 <span class="keyword">using namespace </span>dami;
<a name="l00045"></a>00045
<a name="l00046"></a>00046 <span class="keyword">namespace </span>
<a name="l00047"></a>00047 {
<a name="l00048"></a>00048 <span class="keywordtype">void</span> renderFields(<a class="code" href="class_i_d3___writer.html">ID3_Writer</a>& writer, <span class="keyword">const</span> <a class="code" href="class_i_d3___frame_impl.html">ID3_FrameImpl</a>& frame)
<a name="l00049"></a>00049 {
<a name="l00050"></a>00050 <a class="code" href="globals_8h.html#a2a414b8e1666bd6dd8dce86cdcf74a39" title="Enumeration of the types of text encodings: ascii or unicode.">ID3_TextEnc</a> enc = <a class="code" href="globals_8h.html#a2a414b8e1666bd6dd8dce86cdcf74a39aad49ff1fa495df3aaca00c18a3302ea9">ID3TE_ASCII</a>;
<a name="l00051"></a>00051 <span class="keywordflow">for</span> (<a class="code" href="class_i_d3___frame_impl.html#adc61cf92dc24bb5cda53f141d28349a9">ID3_FrameImpl::const_iterator</a> fi = frame.<a class="code" href="class_i_d3___frame_impl.html#af3de0f8f806fb9815a52c3aeba742213">begin</a>(); fi != frame.<a class="code" href="class_i_d3___frame_impl.html#a741d78d7332d576cfdd65ffbc8827a07">end</a>(); ++fi)
<a name="l00052"></a>00052 {
<a name="l00053"></a>00053 <a class="code" href="class_i_d3___field.html" title="The representative class of an ID3v2 field.">ID3_Field</a>* fld = *fi;
<a name="l00054"></a>00054 <span class="keywordflow">if</span> (fld != <a class="code" href="globals_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a> && fld-><a class="code" href="class_i_d3___field.html#ade2b9184024c1f62e17067253f4adb49">InScope</a>(frame.<a class="code" href="class_i_d3___frame_impl.html#a8fa372b0543cf3c5ed1dd1130c35d6a0">GetSpec</a>()))
<a name="l00055"></a>00055 {
<a name="l00056"></a>00056 <span class="keywordflow">if</span> (fld-><a class="code" href="class_i_d3___field.html#a4bb8d97fddba3a01eb744ab323b43bd2">GetID</a>() == <a class="code" href="globals_8h.html#a23cab982426a968437cd731900cfeb2cafca0c8c5686ec00e25d1850099aa0a4d" title="Text encoding (unicode or ASCII).">ID3FN_TEXTENC</a>)
<a name="l00057"></a>00057 {
<a name="l00058"></a>00058 enc = <span class="keyword">static_cast<</span><a class="code" href="globals_8h.html#a2a414b8e1666bd6dd8dce86cdcf74a39" title="Enumeration of the types of text encodings: ascii or unicode.">ID3_TextEnc</a><span class="keyword">></span>(fld-><a class="code" href="class_i_d3___field.html#a363d1034fb4e60e85f15bcf9818d33ef" title="Returns the value of the integer field.">Get</a>());
<a name="l00059"></a>00059 ID3D_NOTICE( <span class="stringliteral">"id3::v2::renderFields(): found encoding = "</span> << enc );
<a name="l00060"></a>00060 }
<a name="l00061"></a>00061 <span class="keywordflow">else</span>
<a name="l00062"></a>00062 {
<a name="l00063"></a>00063 fld-><a class="code" href="class_i_d3___field.html#a9f3b7f8b5ee007ee64caa133804c38f2">SetEncoding</a>(enc);
<a name="l00064"></a>00064 }
<a name="l00065"></a>00065 fld-><a class="code" href="class_i_d3___field.html#aedea15255b498f5abbc5c0ac29c6b025">Render</a>(writer);
<a name="l00066"></a>00066 }
<a name="l00067"></a>00067 }
<a name="l00068"></a>00068 }
<a name="l00069"></a>00069 }
<a name="l00070"></a>00070
<a name="l00071"></a><a class="code" href="class_i_d3___frame_impl.html#a9046ef19126c73c1b767aed994b3d2ed">00071</a> <span class="keywordtype">void</span> <a class="code" href="class_i_d3___frame_impl.html#a9046ef19126c73c1b767aed994b3d2ed">ID3_FrameImpl::Render</a>(<a class="code" href="class_i_d3___writer.html">ID3_Writer</a>& writer)<span class="keyword"> const</span>
<a name="l00072"></a>00072 <span class="keyword"></span>{
<a name="l00073"></a>00073 <span class="comment">// Return immediately if we have no fields, which (usually) means we're</span>
<a name="l00074"></a>00074 <span class="comment">// trying to render a frame which has been Cleared or hasn't been initialized</span>
<a name="l00075"></a>00075 <span class="keywordflow">if</span> (!this-><a class="code" href="class_i_d3___frame_impl.html#af5c9dfa8a685010b1b45e3a4688b2e32">NumFields</a>())
<a name="l00076"></a>00076 {
<a name="l00077"></a>00077 <span class="keywordflow">return</span>;
<a name="l00078"></a>00078 }
<a name="l00079"></a>00079
<a name="l00080"></a>00080 <a class="code" href="class_i_d3___frame_header.html">ID3_FrameHeader</a> hdr;
<a name="l00081"></a>00081
<a name="l00082"></a>00082 <span class="keyword">const</span> <span class="keywordtype">size_t</span> hdr_size = hdr.<a class="code" href="class_i_d3___frame_header.html#a60f80f634d7af97a8f7497a4ec7f2ac8">Size</a>();
<a name="l00083"></a>00083
<a name="l00084"></a>00084 <span class="comment">// 1. Write out the field data to the buffer, with the assumption that</span>
<a name="l00085"></a>00085 <span class="comment">// we won't be decompressing, since this is the usual behavior</span>
<a name="l00086"></a>00086 String flds;
<a name="l00087"></a>00087 <a class="code" href="classdami_1_1io_1_1_string_writer.html">io::StringWriter</a> fldWriter(flds);
<a name="l00088"></a>00088 <span class="keywordtype">size_t</span> origSize = 0;
<a name="l00089"></a>00089 <span class="keywordflow">if</span> (!this-><a class="code" href="class_i_d3___frame_impl.html#a1050ac21222198c58c1689d56452a747" title="Returns whether or not the compression flag is set.">GetCompression</a>())
<a name="l00090"></a>00090 {
<a name="l00091"></a>00091 renderFields(fldWriter, *<span class="keyword">this</span>);
<a name="l00092"></a>00092 origSize = flds.size();
<a name="l00093"></a>00093 ID3D_NOTICE ( <span class="stringliteral">"ID3_FrameImpl::Render(): uncompressed fields"</span> );
<a name="l00094"></a>00094 }
<a name="l00095"></a>00095 <span class="keywordflow">else</span>
<a name="l00096"></a>00096 {
<a name="l00097"></a>00097 <a class="code" href="classdami_1_1io_1_1_compressed_writer.html">io::CompressedWriter</a> cr(fldWriter);
<a name="l00098"></a>00098 renderFields(cr, *<span class="keyword">this</span>);
<a name="l00099"></a>00099 cr.<a class="code" href="classdami_1_1io_1_1_compressed_writer.html#a84d1e6ce07149240c26d17b8b40782f1" title="Flush the writer.">flush</a>();
<a name="l00100"></a>00100 origSize = cr.<a class="code" href="classdami_1_1io_1_1_compressed_writer.html#a07547749b375d6c38e18cdd738794b54">getOrigSize</a>();
<a name="l00101"></a>00101 ID3D_NOTICE ( <span class="stringliteral">"ID3_FrameImpl::Render(): compressed fields, orig size = "</span> <<
<a name="l00102"></a>00102 origSize );
<a name="l00103"></a>00103 }
<a name="l00104"></a>00104
<a name="l00105"></a>00105 <span class="keywordtype">size_t</span> fldSize = flds.size();
<a name="l00106"></a>00106 ID3D_NOTICE ( <span class="stringliteral">"ID3_FrameImpl::Render(): field size = "</span> << fldSize );
<a name="l00107"></a>00107 <span class="comment">// No need to not write empty frames, why would we not? They can be used to fill up padding space</span>
<a name="l00108"></a>00108 <span class="comment">// which is even recommended in the id3 spec.</span>
<a name="l00109"></a>00109 <span class="comment">// if (fldSize == 0)</span>
<a name="l00110"></a>00110 <span class="comment">// {</span>
<a name="l00111"></a>00111 <span class="comment">// ID3D_WARNING ( "ID3_FrameImpl::Render(): no field data" );</span>
<a name="l00112"></a>00112 <span class="comment">// return;</span>
<a name="l00113"></a>00113 <span class="comment">// }</span>
<a name="l00114"></a>00114
<a name="l00115"></a>00115 <span class="comment">// determine which flags need to be set</span>
<a name="l00116"></a>00116 <a class="code" href="globals_8h.html#a65f85814a8290f9797005d3b28e7e5fc">uchar</a> eID = this-><a class="code" href="class_i_d3___frame_impl.html#af192377485d4b3004a5c3824c376a47c">GetEncryptionID</a>(), gID = this-><a class="code" href="class_i_d3___frame_impl.html#ac33a9fb36ecca2d83ee9cfe9dac30541">GetGroupingID</a>();
<a name="l00117"></a>00117 <a class="code" href="globals_8h.html#a78f454bf66f16b1e1c9f8e37bda9ab8a" title="Enumeration of the different types of frames recognized by id3lib.">ID3_FrameID</a> fid = this-><a class="code" href="class_i_d3___frame_impl.html#ad31a62ad3c8e53b4f9ba497e72e83666">GetID</a>();
<a name="l00118"></a>00118 <span class="keywordflow">if</span> (fid == <a class="code" href="globals_8h.html#a78f454bf66f16b1e1c9f8e37bda9ab8aac969f7fe3c50b9d87efdf0ad15c3802c" title="No known frame.">ID3FID_NOFRAME</a>)
<a name="l00119"></a>00119 {
<a name="l00120"></a>00120 <span class="keyword">const</span> <span class="keywordtype">char</span> *tid = this-><a class="code" href="class_i_d3___frame_impl.html#adf959f2f5489cbef2dfcbdad0b427b0e">GetTextID</a>();
<a name="l00121"></a>00121 hdr.<a class="code" href="class_i_d3___frame_header.html#a2362d5a31497768a9e9e350aeb9666d2">SetUnknownFrame</a>(tid);
<a name="l00122"></a>00122 }
<a name="l00123"></a>00123 <span class="keywordflow">else</span>
<a name="l00124"></a>00124 {
<a name="l00125"></a>00125 hdr.<a class="code" href="class_i_d3___frame_header.html#a89ec0d7950b719b7ddd5a83044f002fa">SetFrameID</a>(fid);
<a name="l00126"></a>00126 }
<a name="l00127"></a>00127 hdr.<a class="code" href="class_i_d3___frame_header.html#a70c2a2939dac7a9897b45d6407f91ca3">SetEncryption</a>(eID > 0);
<a name="l00128"></a>00128 hdr.<a class="code" href="class_i_d3___frame_header.html#ae4a1868fbefaaaf8456315c5c7a34cc2">SetGrouping</a>(gID > 0);
<a name="l00129"></a>00129 hdr.<a class="code" href="class_i_d3___frame_header.html#ab4231b74a46663d7ae992aa1b10bb405">SetCompression</a>(origSize > fldSize);
<a name="l00130"></a>00130 hdr.<a class="code" href="class_i_d3___header.html#a59ca0d4289297b721cffdc1c33014d5c">SetDataSize</a>(fldSize + ((hdr.<a class="code" href="class_i_d3___frame_header.html#aef256ecfd63ac9aed0a4c85a0b6fd003">GetCompression</a>() ? 4 : 0) +
<a name="l00131"></a>00131 (hdr.<a class="code" href="class_i_d3___frame_header.html#adc722dfdf29e6c19fb170c8bad011463">GetEncryption</a>() ? 1 : 0) +
<a name="l00132"></a>00132 (hdr.<a class="code" href="class_i_d3___frame_header.html#ace80a9ca6fd851658dd344f7b2028bb0">GetGrouping</a>() ? 1 : 0)));
<a name="l00133"></a>00133
<a name="l00134"></a>00134 <span class="comment">// write out the header</span>
<a name="l00135"></a>00135 hdr.<a class="code" href="class_i_d3___frame_header.html#ae15d17fff119357add7efa812f6e08f6">Render</a>(writer);
<a name="l00136"></a>00136
<a name="l00137"></a>00137 <span class="keywordflow">if</span> (fldSize != 0)
<a name="l00138"></a>00138 {
<a name="l00139"></a>00139 <span class="comment">// No-man's land! Not part of the header, not part of the data</span>
<a name="l00140"></a>00140 <span class="keywordflow">if</span> (hdr.<a class="code" href="class_i_d3___frame_header.html#aef256ecfd63ac9aed0a4c85a0b6fd003">GetCompression</a>())
<a name="l00141"></a>00141 {
<a name="l00142"></a>00142 <a class="code" href="namespacedami_1_1io.html#aca584020fcdd2925490c52af0eca5dcb">io::writeBENumber</a>(writer, origSize, <span class="keyword">sizeof</span>(uint32));
<a name="l00143"></a>00143 ID3D_NOTICE( <span class="stringliteral">"ID3_FrameImpl::Render(): frame is compressed, wrote origSize = "</span> << origSize );
<a name="l00144"></a>00144 }
<a name="l00145"></a>00145 <span class="keywordflow">if</span> (hdr.<a class="code" href="class_i_d3___frame_header.html#adc722dfdf29e6c19fb170c8bad011463">GetEncryption</a>())
<a name="l00146"></a>00146 {
<a name="l00147"></a>00147 writer.<a class="code" href="class_i_d3___writer.html#a2fd7fda2100f38a45038b80de8ed4432" title="Write a single character and advance the internal position.">writeChar</a>(eID);
<a name="l00148"></a>00148 ID3D_NOTICE( <span class="stringliteral">"ID3_FrameImpl::Render(): frame is compressed, encryption id = "</span> << eID );
<a name="l00149"></a>00149 }
<a name="l00150"></a>00150 <span class="keywordflow">if</span> (hdr.<a class="code" href="class_i_d3___frame_header.html#ace80a9ca6fd851658dd344f7b2028bb0">GetGrouping</a>())
<a name="l00151"></a>00151 {
<a name="l00152"></a>00152 writer.<a class="code" href="class_i_d3___writer.html#a2fd7fda2100f38a45038b80de8ed4432" title="Write a single character and advance the internal position.">writeChar</a>(gID);
<a name="l00153"></a>00153 ID3D_NOTICE( <span class="stringliteral">"ID3_FrameImpl::Render(): frame is compressed, grouping id = "</span> << gID );
<a name="l00154"></a>00154 }
<a name="l00155"></a>00155
<a name="l00156"></a>00156 <span class="comment">// Write the field data</span>
<a name="l00157"></a>00157 writer.<a class="code" href="class_i_d3___writer.html#a287fd94f06b37fb638029b904e6f1d42" title="Write up to len characters into buf and advance the internal position accordingly...">writeChars</a>(flds.data(), fldSize);
<a name="l00158"></a>00158 }
<a name="l00159"></a>00159 _changed = <span class="keyword">false</span>;
<a name="l00160"></a>00160 }
<a name="l00161"></a>00161
</pre></div></div>
<hr class="footer"/><address style="text-align: right;"><small>Generated on Wed Jan 12 23:46:35 2011 for id3lib by
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