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<hr><h1>src/tag_parse.cpp</h1><a href="tag__parse_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 <font class="comment">// $Id: tag_parse.cpp,v 1.38 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 <config.h></font> <font class="comment">// Must include before zlib.h to compile on WinCE</font>
00029 <font class="preprocessor">#endif</font>
00030 <font class="preprocessor"></font>
00031
00032
00033 <font class="preprocessor">#include <zlib.h></font>
00034 <font class="preprocessor">#include <string.h></font>
00035 <font class="preprocessor">#include <memory.h></font>
00036
00037 <font class="preprocessor">#include "<a class="code" href="tag__impl_8h.html">tag_impl.h</a>"</font>
00038 <font class="preprocessor">#include "utils.h"</font>
00039 <font class="preprocessor">#include "io_decorators.h"</font>
00040 <font class="preprocessor">#include "io_helpers.h"</font>
00041 <font class="preprocessor">#include "io_strings.h"</font>
00042 <font class="preprocessor">#include "<a class="code" href="readers_8h.html">readers.h</a>"</font>
00043
00044 <font class="keyword">using</font> <font class="keyword">namespace </font>dami;
00045
00046 <font class="keyword">namespace</font>
00047 <font class="keyword"></font>{
00048 <font class="keywordtype">bool</font> parseFrames(<a class="code" href="class_i_d3___tag_impl.html">ID3_TagImpl</a>& tag, <a class="code" href="class_i_d3___reader.html">ID3_Reader</a>& rdr)
00049 {
00050 <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>();
00051 io::ExitTrigger et(rdr, beg);
00052 <a class="code" href="class_i_d3___reader.html#s2">ID3_Reader::pos_type</a> last_pos = beg;
00053 size_t totalSize = 0;
00054 size_t frameSize = 0;
00055 <font class="keywordflow">while</font> (!rdr.<a class="code" href="class_i_d3___reader.html#a11">atEnd</a>() && rdr.<a class="code" href="class_i_d3___reader.html#a6">peekChar</a>() != <font class="charliteral">'\0'</font>)
00056 {
00057 ID3D_NOTICE( <font class="stringliteral">"id3::v2::parseFrames(): rdr.getBeg() = "</font> << rdr.<a class="code" href="class_i_d3___reader.html#a1">getBeg</a>() );
00058 ID3D_NOTICE( <font class="stringliteral">"id3::v2::parseFrames(): rdr.getCur() = "</font> << rdr.<a class="code" href="class_i_d3___reader.html#a3">getCur</a>() );
00059 ID3D_NOTICE( <font class="stringliteral">"id3::v2::parseFrames(): rdr.getEnd() = "</font> << rdr.<a class="code" href="class_i_d3___reader.html#a2">getEnd</a>() );
00060 last_pos = rdr.<a class="code" href="class_i_d3___reader.html#a3">getCur</a>();
00061 <a class="code" href="class_i_d3___frame.html">ID3_Frame</a>* f = <font class="keyword">new</font> <a class="code" href="class_i_d3___frame.html">ID3_Frame</a>;
00062 f-><a class="code" href="class_i_d3___frame.html#a16">SetSpec</a>(tag.<a class="code" href="class_i_d3___tag_impl.html#a32">GetSpec</a>());
00063 <font class="keywordtype">bool</font> goodParse = f-><a class="code" href="class_i_d3___frame.html#a12">Parse</a>(rdr);
00064 frameSize = rdr.<a class="code" href="class_i_d3___reader.html#a3">getCur</a>() - last_pos;
00065 ID3D_NOTICE( <font class="stringliteral">"id3::v2::parseFrames(): frameSize = "</font> << frameSize );
00066 totalSize += frameSize;
00067
00068 <font class="keywordflow">if</font> (frameSize == 0)
00069 {
00070 <font class="comment">// There is a problem. </font>
00071 <font class="comment">// If the frame size is 0, then we can't progress. </font>
00072 ID3D_WARNING( <font class="stringliteral">"id3::v2::parseFrames(): frame size is 0, can't "</font> <<
00073 <font class="stringliteral">"continue parsing frames"</font>);
00074 <font class="keyword">delete</font> f;
00075 <font class="comment">// Break for now. </font>
00076 <font class="keywordflow">break</font>;
00077 }
00078 <font class="keywordflow">else</font> <font class="keywordflow">if</font> (!goodParse)
00079 {
00080 <font class="comment">// bad parse! we can't attach this frame.</font>
00081 ID3D_WARNING( <font class="stringliteral">"id3::v2::parseFrames(): bad parse, deleting frame"</font>);
00082 <font class="keyword">delete</font> f;
00083 }
00084 <font class="keywordflow">else</font> <font class="keywordflow">if</font> (f-><a class="code" href="class_i_d3___frame.html#a5">GetID</a>() != <a class="code" href="globals_8h.html#a219a171">ID3FID_METACOMPRESSION</a>)
00085 {
00086 ID3D_NOTICE( <font class="stringliteral">"id3::v2::parseFrames(): attaching non-compressed "</font> <<
00087 <font class="stringliteral">"frame"</font>);
00088 <font class="comment">// a good, uncompressed frame. attach away! </font>
00089 tag.<a class="code" href="class_i_d3___tag_impl.html#a16">AttachFrame</a>(f);
00090 }
00091 <font class="keywordflow">else</font>
00092 {
00093 ID3D_NOTICE( <font class="stringliteral">"id3::v2::parseFrames(): parsing ID3v2.2.1 "</font> <<
00094 <font class="stringliteral">"compressed frame"</font>);
00095 <font class="comment">// hmm. an ID3v2.2.1 compressed frame. It contains 1 or more</font>
00096 <font class="comment">// compressed frames. Uncompress and call parseFrames recursively.</font>
00097 <a class="code" href="class_i_d3___field.html">ID3_Field</a>* fld = f-><a class="code" href="class_i_d3___frame.html#a6">GetField</a>(<a class="code" href="globals_8h.html#a218a74">ID3FN_DATA</a>);
00098 <font class="keywordflow">if</font> (fld)
00099 {
00100 <a class="code" href="class_i_d3___memory_reader.html">ID3_MemoryReader</a> mr(fld-><a class="code" href="class_i_d3___field.html#a23">GetRawBinary</a>(), fld-><a class="code" href="class_i_d3___field.html#a2">BinSize</a>());
00101 <a class="code" href="class_i_d3___reader.html#s1">ID3_Reader::char_type</a> ch = mr.<a class="code" href="class_i_d3___reader.html#a5">readChar</a>();
00102 <font class="keywordflow">if</font> (ch != <font class="charliteral">'z'</font>)
00103 {
00104 <font class="comment">// unknown compression method </font>
00105 ID3D_WARNING( <font class="stringliteral">"id3::v2::parseFrames(): unknown compression id "</font> <<
00106 <font class="stringliteral">" = '"</font> << ch << <font class="stringliteral">"'"</font> );
00107 }
00108 <font class="keywordflow">else</font>
00109 {
00110 <a class="code" href="sized__types_8h.html#a4">uint32</a> newSize = io::readBENumber(mr, <font class="keyword">sizeof</font>(<a class="code" href="sized__types_8h.html#a4">uint32</a>));
00111 size_t oldSize = f-><a class="code" href="class_i_d3___frame.html#a20">GetDataSize</a>() - <font class="keyword">sizeof</font>(uint32) - 1;
00112 io::CompressedReader cr(mr, newSize);
00113 parseFrames(tag, cr);
00114 <font class="keywordflow">if</font> (!cr.atEnd())
00115 {
00116 <font class="comment">// hmm. it didn't parse the entire uncompressed data. wonder</font>
00117 <font class="comment">// why.</font>
00118 ID3D_WARNING( <font class="stringliteral">"id3::v2::parseFrames(): didn't parse entire "</font> <<
00119 <font class="stringliteral">"id3v2.2.1 compressed memory stream"</font>);
00120 }
00121 }
00122 }
00123 <font class="keyword">delete</font> f;
00124 }
00125 et.setExitPos(rdr.<a class="code" href="class_i_d3___reader.html#a3">getCur</a>());
00126 }
00127 <font class="keywordflow">if</font> (rdr.<a class="code" href="class_i_d3___reader.html#a6">peekChar</a>() == <font class="charliteral">'\0'</font>)
00128 {
00129 ID3D_NOTICE( <font class="stringliteral">"id3::v2::parseFrames: done parsing, padding at postion "</font> <<
00130 rdr.<a class="code" href="class_i_d3___reader.html#a3">getCur</a>() );
00131 }
00132 <font class="keywordflow">else</font>
00133 {
00134 ID3D_NOTICE( <font class="stringliteral">"id3::v2::parseFrames: done parsing, [cur, end] = ["</font> <<
00135 rdr.<a class="code" href="class_i_d3___reader.html#a3">getCur</a>() << <font class="stringliteral">", "</font> << rdr.<a class="code" href="class_i_d3___reader.html#a2">getEnd</a>() << <font class="stringliteral">"]"</font> );
00136 }
00137 <font class="keywordflow">return</font> <font class="keyword">true</font>;
00138 }
00139 };
00140
00141 <font class="keywordtype">bool</font> id3::v2::parse(<a class="code" href="class_i_d3___tag_impl.html">ID3_TagImpl</a>& tag, <a class="code" href="class_i_d3___reader.html">ID3_Reader</a>& reader)
00142 {
00143 <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>();
00144 io::ExitTrigger et(reader);
00145
00146 <a class="code" href="class_i_d3___tag_header.html">ID3_TagHeader</a> hdr;
00147
00148 io::WindowedReader wr(reader, <a class="code" href="class_i_d3___tag_header.html#s10s8">ID3_TagHeader::SIZE</a>);
00149
00150 <font class="keywordflow">if</font> (!hdr.<a class="code" href="class_i_d3___tag_header.html#a6">Parse</a>(wr) || wr.getCur() == beg)
00151 {
00152 ID3D_NOTICE( <font class="stringliteral">"id3::v2::parse(): parsing header failes"</font> );
00153 <font class="keywordflow">return</font> <font class="keyword">false</font>;
00154 }
00155
00156 tag.<a class="code" href="class_i_d3___tag_impl.html#a33">SetSpec</a>(hdr.<a class="code" href="class_i_d3___header.html#a3">GetSpec</a>());
00157
00158 size_t dataSize = hdr.<a class="code" href="class_i_d3___header.html#a5">GetDataSize</a>();
00159 ID3D_NOTICE( <font class="stringliteral">"ID3_TagImpl::Parse(ID3_Reader&): dataSize = "</font> << dataSize);
00160
00161 wr.setWindow(wr.getCur(), dataSize);
00162 et.setExitPos(wr.getEnd());
00163
00164 ID3D_NOTICE( <font class="stringliteral">"ID3_TagImpl::Parse(ID3_Reader&): data window beg = "</font> << wr.getBeg() );
00165 ID3D_NOTICE( <font class="stringliteral">"ID3_TagImpl::Parse(ID3_Reader&): data window cur = "</font> << wr.getCur() );
00166 ID3D_NOTICE( <font class="stringliteral">"ID3_TagImpl::Parse(ID3_Reader&): data window end = "</font> << wr.getEnd() );
00167 tag.<a class="code" href="class_i_d3___tag_impl.html#a8">SetExtended</a>(hdr.<a class="code" href="class_i_d3___tag_header.html#a11">GetExtended</a>());
00168 <font class="keywordflow">if</font> (!hdr.<a class="code" href="class_i_d3___tag_header.html#a9">GetUnsync</a>())
00169 {
00170 tag.<a class="code" href="class_i_d3___tag_impl.html#a7">SetUnsync</a>(<font class="keyword">false</font>);
00171 parseFrames(tag, wr);
00172 }
00173 <font class="keywordflow">else</font>
00174 {
00175 <font class="comment">// The buffer has been unsynced. It will have to be resynced to be </font>
00176 <font class="comment">// readable. This has to be done a character at a time. </font>
00177 <font class="comment">//</font>
00178 <font class="comment">// The original reader may be reading in characters from a file. Doing</font>
00179 <font class="comment">// this a character at a time is quite slow. To improve performance, read</font>
00180 <font class="comment">// in the entire buffer into a string, then create an UnsyncedReader from</font>
00181 <font class="comment">// the string.</font>
00182 <font class="comment">//</font>
00183 <font class="comment">// It might be better to implement a BufferedReader so that the details</font>
00184 <font class="comment">// of this can be abstracted away behind a class</font>
00185 tag.<a class="code" href="class_i_d3___tag_impl.html#a7">SetUnsync</a>(<font class="keyword">true</font>);
00186 BString raw = io::readAllBinary(wr);
00187 io::BStringReader bsr(raw);
00188 io::UnsyncedReader ur(bsr);
00189 ID3D_NOTICE( <font class="stringliteral">"ID3_TagImpl::Parse(ID3_Reader&): unsync beg = "</font> << ur.getBeg() );
00190 ID3D_NOTICE( <font class="stringliteral">"ID3_TagImpl::Parse(ID3_Reader&): unsync cur = "</font> << ur.getCur() );
00191 ID3D_NOTICE( <font class="stringliteral">"ID3_TagImpl::Parse(ID3_Reader&): unsync end = "</font> << ur.getEnd() );
00192
00193 <font class="comment">// Now read the UnsyncedReader into another string, and parse the frames</font>
00194 <font class="comment">// from the string. This is done so that 1. the unsynced reader is </font>
00195 <font class="comment">// unsynced exactly once, removing the possibility of multiple unsyncings</font>
00196 <font class="comment">// of the same string, and 2) so that calls to readChars aren't done a </font>
00197 <font class="comment">// character at a time for every call</font>
00198 BString synced = io::readAllBinary(ur);
00199 io::BStringReader sr(synced);
00200 parseFrames(tag, sr);
00201 }
00202
00203 <font class="keywordflow">return</font> <font class="keyword">true</font>;
00204 }
00205
<a name="l00206"></a><a class="code" href="class_i_d3___tag_impl.html#b3">00206</a> <font class="keywordtype">void</font> <a class="code" href="class_i_d3___tag_impl.html#b3">ID3_TagImpl::ParseFile</a>()
00207 {
00208 ifstream file;
00209 <font class="keywordflow">if</font> (<a class="code" href="globals_8h.html#a223a191">ID3E_NoError</a> != openReadableFile(this->GetFileName(), file))
00210 {
00211 <font class="comment">// log this...</font>
00212 <font class="keywordflow">return</font>;
00213 }
00214 <a class="code" href="class_i_d3___i_f_stream_reader.html">ID3_IFStreamReader</a> ifsr(file);
00215 io::WindowedReader wr(ifsr);
00216 wr.setBeg(wr.getCur());
00217
00218 _file_tags.<a class="code" href="class_i_d3___flags.html#a7">clear</a>();
00219 _file_size = getFileSize(file);
00220
00221 <a class="code" href="class_i_d3___reader.html#s2">ID3_Reader::pos_type</a> beg = wr.getBeg();
00222 <a class="code" href="class_i_d3___reader.html#s2">ID3_Reader::pos_type</a> cur = wr.getCur();
00223 <a class="code" href="class_i_d3___reader.html#s2">ID3_Reader::pos_type</a> <a class="code" href="class_i_d3___tag_impl.html#a35">end</a> = wr.getEnd();
00224
00225 <a class="code" href="class_i_d3___reader.html#s2">ID3_Reader::pos_type</a> last = cur;
00226
00227 <font class="keywordflow">if</font> (_tags_to_parse.<a class="code" href="class_i_d3___flags.html#a3">test</a>(<a class="code" href="globals_8h.html#a217a61">ID3TT_ID3V2</a>))
00228 {
00229 <font class="keywordflow">do</font>
00230 {
00231 last = cur;
00232 <font class="comment">// Parse tags at the beginning of the file first...</font>
00233 <font class="keywordflow">if</font> (id3::v2::parse(*<font class="keyword">this</font>, wr))
00234 {
00235 _file_tags.<a class="code" href="class_i_d3___flags.html#a5">add</a>(<a class="code" href="globals_8h.html#a217a61">ID3TT_ID3V2</a>);
00236 }
00237 cur = wr.getCur();
00238 wr.setBeg(cur);
00239 } <font class="keywordflow">while</font> (!wr.atEnd() && cur > last);
00240 }
00241
00242 _prepended_bytes = cur - beg;
00243
00244 cur = wr.setCur(<a class="code" href="class_i_d3___tag_impl.html#a35">end</a>);
00245 <font class="keywordflow">do</font>
00246 {
00247 last = cur;
00248 ID3D_NOTICE( <font class="stringliteral">"ID3_TagImpl::ParseFile(): beg = "</font> << wr.getBeg() );
00249 ID3D_NOTICE( <font class="stringliteral">"ID3_TagImpl::ParseFile(): cur = "</font> << wr.getCur() );
00250 ID3D_NOTICE( <font class="stringliteral">"ID3_TagImpl::ParseFile(): end = "</font> << wr.getEnd() );
00251 <font class="comment">// ...then the tags at the end</font>
00252 ID3D_NOTICE( <font class="stringliteral">"ID3_TagImpl::ParseFile(): musicmatch? cur = "</font> << wr.getCur() );
00253 <font class="keywordflow">if</font> (_tags_to_parse.<a class="code" href="class_i_d3___flags.html#a3">test</a>(<a class="code" href="globals_8h.html#a217a64">ID3TT_MUSICMATCH</a>) && mm::parse(*<font class="keyword">this</font>, wr))
00254 {
00255 ID3D_NOTICE( <font class="stringliteral">"ID3_TagImpl::ParseFile(): musicmatch! cur = "</font> << wr.getCur() );
00256 _file_tags.<a class="code" href="class_i_d3___flags.html#a5">add</a>(<a class="code" href="globals_8h.html#a217a64">ID3TT_MUSICMATCH</a>);
00257 wr.setEnd(wr.getCur());
00258 }
00259 ID3D_NOTICE( <font class="stringliteral">"ID3_TagImpl::ParseFile(): lyr3v1? cur = "</font> << wr.getCur() );
00260 <font class="keywordflow">if</font> (_tags_to_parse.<a class="code" href="class_i_d3___flags.html#a3">test</a>(<a class="code" href="globals_8h.html#a217a62">ID3TT_LYRICS3</a>) && lyr3::v1::parse(*<font class="keyword">this</font>, wr))
00261 {
00262 ID3D_NOTICE( <font class="stringliteral">"ID3_TagImpl::ParseFile(): lyr3v1! cur = "</font> << wr.getCur() );
00263 _file_tags.<a class="code" href="class_i_d3___flags.html#a5">add</a>(<a class="code" href="globals_8h.html#a217a62">ID3TT_LYRICS3</a>);
00264 wr.setEnd(wr.getCur());
00265 }
00266 ID3D_NOTICE( <font class="stringliteral">"ID3_TagImpl::ParseFile(): lyr3v2? cur = "</font> << wr.getCur() );
00267 <font class="keywordflow">if</font> (_tags_to_parse.<a class="code" href="class_i_d3___flags.html#a3">test</a>(<a class="code" href="globals_8h.html#a217a63">ID3TT_LYRICS3V2</a>) && lyr3::v2::parse(*<font class="keyword">this</font>, wr))
00268 {
00269 ID3D_NOTICE( <font class="stringliteral">"ID3_TagImpl::ParseFile(): lyr3v2! cur = "</font> << wr.getCur() );
00270 _file_tags.<a class="code" href="class_i_d3___flags.html#a5">add</a>(<a class="code" href="globals_8h.html#a217a60">ID3TT_ID3V1</a>);
00271 wr.setEnd(wr.getCur());
00272 }
00273 ID3D_NOTICE( <font class="stringliteral">"ID3_TagImpl::ParseFile(): id3v1? cur = "</font> << wr.getCur() );
00274 <font class="keywordflow">if</font> (_tags_to_parse.<a class="code" href="class_i_d3___flags.html#a3">test</a>(<a class="code" href="globals_8h.html#a217a60">ID3TT_ID3V1</a>) && id3::v1::parse(*<font class="keyword">this</font>, wr))
00275 {
00276 ID3D_NOTICE( <font class="stringliteral">"ID3_TagImpl::ParseFile(): id3v1! cur = "</font> << wr.getCur() );
00277 wr.setEnd(wr.getCur());
00278 _file_tags.<a class="code" href="class_i_d3___flags.html#a5">add</a>(<a class="code" href="globals_8h.html#a217a60">ID3TT_ID3V1</a>);
00279 }
00280 cur = wr.getCur();
00281 } <font class="keywordflow">while</font> (cur != last);
00282 _appended_bytes = <a class="code" href="class_i_d3___tag_impl.html#a35">end</a> - cur;
00283 }
</pre></div><hr><address><small>Generated on Thu Jan 3 07:35:56 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>,
© 1997-2001</small></address>
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