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<hr><h1>src/frame_parse.cpp</h1><a href="frame__parse_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 <font class="comment">// $Id: frame_parse.cpp,v 1.31 2001/08/05 21:18:26 abscess 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 <config.h></font>
00029 <font class="preprocessor">#endif</font>
00030 <font class="preprocessor"></font>
00031
00032
00033 <font class="preprocessor">#include "<a class="code" href="frame__impl_8h.html">frame_impl.h</a>"</font>
00034 <font class="preprocessor">#include "utils.h"</font>
00035 <font class="preprocessor">#include "io_decorators.h"</font>
00036
00037 <font class="keyword">using</font> <font class="keyword">namespace </font>dami;
00038
00039 <font class="keyword">namespace</font>
00040 <font class="keyword"></font>{
00041 <font class="keywordtype">bool</font> parseFields(<a class="code" href="class_i_d3___reader.html">ID3_Reader</a>& rdr, <a class="code" href="class_i_d3___frame_impl.html">ID3_FrameImpl</a>& frame)
00042 {
00043 io::ExitTrigger et(rdr);
00044 <a class="code" href="globals_8h.html#a214">ID3_TextEnc</a> enc = <a class="code" href="globals_8h.html#a214a47">ID3TE_ASCII</a>; <font class="comment">// set the default encoding </font>
00045 <a class="code" href="globals_8h.html#a216">ID3_V2Spec</a> spec = frame.<a class="code" href="class_i_d3___frame_impl.html#a18">GetSpec</a>();
00046 <font class="comment">// parse the frame's fields </font>
00047 ID3D_NOTICE( <font class="stringliteral">"ID3_FrameImpl::Parse(): num_fields = "</font> <<
00048 frame.<a class="code" href="class_i_d3___frame_impl.html#a8">NumFields</a>() );
00049 <font class="keywordflow">for</font> (<a class="code" href="class_i_d3___frame_impl.html#s0">ID3_FrameImpl::iterator</a> fi = frame.<a class="code" href="class_i_d3___frame_impl.html#a26">begin</a>(); fi != frame.<a class="code" href="class_i_d3___frame_impl.html#a27">end</a>(); ++fi)
00050 {
00051 <a class="code" href="class_i_d3___field.html">ID3_Field</a>* fp = *fi;
00052
00053 <font class="keywordflow">if</font> (rdr.<a class="code" href="class_i_d3___reader.html#a11">atEnd</a>())
00054 {
00055 <font class="comment">// there's no remaining data to parse! </font>
00056 ID3D_WARNING( <font class="stringliteral">"ID3_FrameImpl::Parse(): out of data at postion "</font> <<
00057 rdr.<a class="code" href="class_i_d3___reader.html#a3">getCur</a>() );
00058 <font class="keywordflow">if</font>(fp-><a class="code" href="class_i_d3___field.html#a29">GetType</a>() == <a class="code" href="globals_8h.html#a222a189">ID3FTY_TEXTSTRING</a>) <font class="comment">//correct handling of winamp-esque empty frames</font>
00059 {
00060 <font class="comment">// Exit the loop (don't just return true).</font>
00061 <font class="comment">// This will set the current "pointer" of the reader to the correct value</font>
00062 <font class="keywordflow">break</font>;
00063 }
00064
00065 <font class="keywordflow">return</font> <font class="keyword">false</font>;
00066 }
00067
00068 <font class="keywordflow">if</font> (<a class="code" href="globals_8h.html#a24">NULL</a> == fp)
00069 {
00070 <font class="comment">// Ack! Why is the field NULL? Log this...</font>
00071 ID3D_WARNING( <font class="stringliteral">"ID3_FrameImpl::Parse(): field is null"</font> );
00072 <font class="keywordflow">continue</font>;
00073 }
00074
00075 <font class="keywordflow">if</font> (!fp-><a class="code" href="class_i_d3___field.html#a27">InScope</a>(spec))
00076 {
00077 ID3D_NOTICE( <font class="stringliteral">"ID3_FrameImpl::Parse(): field is not in scope"</font> );
00078 <font class="comment">// continue with the rest of the fields</font>
00079 <font class="keywordflow">continue</font>;
00080 }
00081
00082 ID3D_NOTICE( <font class="stringliteral">"ID3_FrameImpl::Parse(): setting enc to "</font> << enc );
00083 fp-><a class="code" href="class_i_d3___field.html#a30">SetEncoding</a>(enc);
00084 <a class="code" href="class_i_d3___reader.html#s2">ID3_Reader::pos_type</a> beg = rdr.<a class="code" href="class_i_d3___reader.html#a3">getCur</a>();
00085 et.setExitPos(beg);
00086 ID3D_NOTICE( <font class="stringliteral">"ID3_FrameImpl::Parse(): parsing field, cur = "</font> << beg );
00087 ID3D_NOTICE( <font class="stringliteral">"ID3_FrameImpl::Parse(): parsing field, end = "</font> <<
00088 rdr.<a class="code" href="class_i_d3___reader.html#a2">getEnd</a>() );
00089 <font class="keywordflow">if</font> (!fp-><a class="code" href="class_i_d3___field.html#a34">Parse</a>(rdr) || rdr.<a class="code" href="class_i_d3___reader.html#a3">getCur</a>() == beg)
00090 {
00091 <font class="comment">// nothing to parse! ack! parse error... </font>
00092 ID3D_WARNING( <font class="stringliteral">"ID3_FrameImpl::Parse(): no data parsed, bad parse"</font> );
00093 <font class="keywordflow">return</font> <font class="keyword">false</font>;
00094 }
00095
00096 <font class="keywordflow">if</font> (fp-><a class="code" href="class_i_d3___field.html#a28">GetID</a>() == <a class="code" href="globals_8h.html#a218a71">ID3FN_TEXTENC</a>)
00097 {
00098 enc = static_cast<ID3_TextEnc>(fp-><a class="code" href="class_i_d3___field.html#a6">Get</a>());
00099 ID3D_NOTICE( <font class="stringliteral">"ID3_FrameImpl::Parse(): found encoding = "</font> << enc );
00100 }
00101 }
00102 et.setExitPos(rdr.<a class="code" href="class_i_d3___reader.html#a3">getCur</a>());
00103
00104 <font class="keywordflow">return</font> <font class="keyword">true</font>;
00105 }
00106 };
00107
<a name="l00108"></a><a class="code" href="class_i_d3___frame_impl.html#a13">00108</a> <font class="keywordtype">bool</font> <a class="code" href="class_i_d3___frame_impl.html#a13">ID3_FrameImpl::Parse</a>(<a class="code" href="class_i_d3___reader.html">ID3_Reader</a>& reader)
00109 {
00110 io::ExitTrigger et(reader);
00111 ID3D_NOTICE( <font class="stringliteral">"ID3_FrameImpl::Parse(): reader.getBeg() = "</font> << reader.<a class="code" href="class_i_d3___reader.html#a1">getBeg</a>() );
00112 ID3D_NOTICE( <font class="stringliteral">"ID3_FrameImpl::Parse(): reader.getCur() = "</font> << reader.<a class="code" href="class_i_d3___reader.html#a3">getCur</a>() );
00113 ID3D_NOTICE( <font class="stringliteral">"ID3_FrameImpl::Parse(): reader.getEnd() = "</font> << reader.<a class="code" href="class_i_d3___reader.html#a2">getEnd</a>() );
00114 <a class="code" href="class_i_d3___reader.html#s2">ID3_Reader::pos_type</a> beg = reader.<a class="code" href="class_i_d3___reader.html#a3">getCur</a>();
00115
00116 <font class="keywordflow">if</font> (!_hdr.<a class="code" href="class_i_d3___frame_header.html#a3">Parse</a>(reader) || reader.<a class="code" href="class_i_d3___reader.html#a3">getCur</a>() == beg)
00117 {
00118 ID3D_WARNING( <font class="stringliteral">"ID3_FrameImpl::Parse(): no header to parse"</font> );
00119 <font class="keywordflow">return</font> <font class="keyword">false</font>;
00120 }
00121 ID3D_NOTICE( <font class="stringliteral">"ID3_FrameImpl::Parse(): after hdr, getCur() = "</font> << reader.<a class="code" href="class_i_d3___reader.html#a3">getCur</a>() );
00122 ID3D_NOTICE( <font class="stringliteral">"ID3_FrameImpl::Parse(): found frame! id = "</font> << _hdr.<a class="code" href="class_i_d3___frame_header.html#a7">GetTextID</a>() );
00123
00124 <font class="comment">// data is the part of the frame buffer that appears after the header </font>
00125 <font class="keyword">const</font> size_t dataSize = _hdr.<a class="code" href="class_i_d3___header.html#a5">GetDataSize</a>();
00126 ID3D_NOTICE( <font class="stringliteral">"ID3_FrameImpl::Parse(): dataSize = "</font> << dataSize );
00127 <font class="keywordflow">if</font> (reader.<a class="code" href="class_i_d3___reader.html#a2">getEnd</a>() < beg + dataSize)
00128 {
00129 ID3D_WARNING( <font class="stringliteral">"ID3_FrameImpl::Parse(): not enough data to parse frame"</font> );
00130 <font class="keywordflow">return</font> <font class="keyword">false</font>;
00131 }
00132 io::WindowedReader wr(reader, dataSize);
00133 ID3D_NOTICE( <font class="stringliteral">"ID3_FrameImpl::Parse(): window getBeg() = "</font> << wr.getBeg() );
00134 ID3D_NOTICE( <font class="stringliteral">"ID3_FrameImpl::Parse(): window getCur() = "</font> << wr.getCur() );
00135 ID3D_NOTICE( <font class="stringliteral">"ID3_FrameImpl::Parse(): window getEnd() = "</font> << wr.getEnd() );
00136
00137 <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> origSize = 0;
00138 <font class="keywordflow">if</font> (_hdr.<a class="code" href="class_i_d3___frame_header.html#a14">GetCompression</a>())
00139 {
00140 origSize = io::readBENumber(reader, <font class="keyword">sizeof</font>(<a class="code" href="sized__types_8h.html#a4">uint32</a>));
00141 ID3D_NOTICE( <font class="stringliteral">"ID3_FrameImpl::Parse(): frame is compressed, origSize = "</font> << origSize );
00142 }
00143
00144 <font class="keywordflow">if</font> (_hdr.<a class="code" href="class_i_d3___frame_header.html#a15">GetEncryption</a>())
00145 {
00146 <font class="keywordtype">char</font> ch = wr.readChar();
00147 this-><a class="code" href="class_i_d3___frame_impl.html#a22">SetEncryptionID</a>(ch);
00148 ID3D_NOTICE( <font class="stringliteral">"ID3_FrameImpl::Parse(): frame is encrypted, encryption_id = "</font> << (<font class="keywordtype">int</font>) ch );
00149 }
00150
00151 <font class="keywordflow">if</font> (_hdr.<a class="code" href="class_i_d3___frame_header.html#a16">GetGrouping</a>())
00152 {
00153 <font class="keywordtype">char</font> ch = wr.readChar();
00154 this-><a class="code" href="class_i_d3___frame_impl.html#a24">SetGroupingID</a>(ch);
00155 ID3D_NOTICE( <font class="stringliteral">"ID3_FrameImpl::Parse(): frame is encrypted, grouping_id = "</font> << (<font class="keywordtype">int</font>) ch );
00156 }
00157
00158 <font class="comment">// set the type of frame based on the parsed header </font>
00159 this-><a class="code" href="class_i_d3___frame_impl.html#b1">_ClearFields</a>();
00160 this-><a class="code" href="class_i_d3___frame_impl.html#b2">_InitFields</a>();
00161
00162 <font class="keywordtype">bool</font> success = <font class="keyword">false</font>;
00163 <font class="comment">// expand out the data if it's compressed </font>
00164 <font class="keywordflow">if</font> (!_hdr.<a class="code" href="class_i_d3___frame_header.html#a14">GetCompression</a>())
00165 {
00166 success = parseFields(wr, *<font class="keyword">this</font>);
00167 }
00168 <font class="keywordflow">else</font>
00169 {
00170 io::CompressedReader csr(wr, origSize);
00171 success = parseFields(csr, *<font class="keyword">this</font>);
00172 }
00173 et.setExitPos(wr.getCur());
00174
00175 _changed = <font class="keyword">false</font>;
00176 <font class="keywordflow">return</font> <font class="keyword">true</font>;
00177 }
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