<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1">
<title>src/tag_file.cpp Source File</title>
<link href="id3lib.css" rel="stylesheet" type="text/css">
</head><body bgcolor="#ffffff">
<!-- Generated by Doxygen 1.2.12 -->
<center>
<a class="qindex" href="index.html">Main Page</a> <a class="qindex" href="namespaces.html">Namespace List</a> <a class="qindex" href="hierarchy.html">Class Hierarchy</a> <a class="qindex" href="annotated.html">Compound List</a> <a class="qindex" href="files.html">File List</a> <a class="qindex" href="namespacemembers.html">Namespace Members</a> <a class="qindex" href="functions.html">Compound Members</a> <a class="qindex" href="globals.html">File Members</a> </center>
<hr><h1>src/tag_file.cpp</h1><a href="tag__file_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 <font class="comment">// $Id: tag_file.cpp,v 1.34 2001/12/16 09:40:56 shadrack 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 <string.h></font>
00034 <font class="preprocessor">#include <fstream.h></font>
00035 <font class="preprocessor">#include <stdlib.h></font>
00036 <font class="preprocessor">#include "utils.h"</font>
00037 <font class="preprocessor">#include "<a class="code" href="writers_8h.html">writers.h</a>"</font>
00038 <font class="preprocessor">#include "io_strings.h"</font>
00039 <font class="preprocessor">#include "<a class="code" href="tag__impl_8h.html">tag_impl.h</a>"</font>
00040 <font class="preprocessor">#include "utils.h"</font>
00041
00042 <font class="keyword">using</font> <font class="keyword">namespace </font>dami;
00043
00044 <font class="preprocessor">#if !defined HAVE_MKSTEMP</font>
00045 <font class="preprocessor"></font><font class="preprocessor"># include <stdio.h></font>
00046 <font class="preprocessor">#endif</font>
00047 <font class="preprocessor"></font>
00048 <font class="preprocessor">#if defined HAVE_UNISTD_H</font>
00049 <font class="preprocessor"></font><font class="preprocessor"># include <unistd.h></font>
00050 <font class="preprocessor">#endif</font>
00051 <font class="preprocessor"></font>
00052 <font class="preprocessor">#if defined WIN32 && (!defined(WINCE))</font>
00053 <font class="preprocessor"></font><font class="preprocessor"># include <windows.h></font>
00054 <font class="keyword">static</font> <font class="keywordtype">int</font> truncate(<font class="keyword">const</font> <font class="keywordtype">char</font> *path, size_t length)
00055 {
00056 <font class="keywordtype">int</font> result = -1;
00057 HANDLE fh;
00058
00059 fh = ::CreateFile(path,
00060 GENERIC_WRITE | GENERIC_READ,
00061 0,
00062 <a class="code" href="globals_8h.html#a24">NULL</a>,
00063 OPEN_EXISTING,
00064 FILE_ATTRIBUTE_NORMAL,
00065 <a class="code" href="globals_8h.html#a24">NULL</a>);
00066
00067 <font class="keywordflow">if</font>(INVALID_HANDLE_VALUE != fh)
00068 {
00069 SetFilePointer(fh, length, <a class="code" href="globals_8h.html#a24">NULL</a>, FILE_BEGIN);
00070 SetEndOfFile(fh);
00071 CloseHandle(fh);
00072 result = 0;
00073 }
00074
00075 <font class="keywordflow">return</font> result;
00076 }
00077
00078 <font class="comment">// prevents a weird error I was getting compiling this under windows</font>
00079 <font class="preprocessor"># if defined CreateFile</font>
00080 <font class="preprocessor"></font><font class="preprocessor"># undef CreateFile</font>
00081 <font class="preprocessor"></font><font class="preprocessor"># endif</font>
00082 <font class="preprocessor"></font>
00083 <font class="preprocessor">#elif defined(WINCE)</font>
00084 <font class="preprocessor"></font><font class="comment">// Createfile is apparently to defined to CreateFileW. (Bad Bad Bad), so we </font>
00085 <font class="comment">// work around it by converting path to Unicode</font>
00086 <font class="preprocessor"># include <windows.h></font>
00087 <font class="keyword">static</font> <font class="keywordtype">int</font> truncate(<font class="keyword">const</font> <font class="keywordtype">char</font> *path, size_t length)
00088 {
00089 <font class="keywordtype">int</font> result = -1;
00090 <font class="keywordtype">wchar_t</font> wcTempPath[256];
00091 mbstowcs(wcTempPath,path,255);
00092 HANDLE fh;
00093 fh = ::CreateFile(wcTempPath,
00094 GENERIC_WRITE | GENERIC_READ,
00095 0,
00096 <a class="code" href="globals_8h.html#a24">NULL</a>,
00097 OPEN_EXISTING,
00098 FILE_ATTRIBUTE_NORMAL,
00099 <a class="code" href="globals_8h.html#a24">NULL</a>);
00100
00101 <font class="keywordflow">if</font> (INVALID_HANDLE_VALUE != fh)
00102 {
00103 SetFilePointer(fh, length, <a class="code" href="globals_8h.html#a24">NULL</a>, FILE_BEGIN);
00104 SetEndOfFile(fh);
00105 CloseHandle(fh);
00106 result = 0;
00107 }
00108
00109 <font class="keywordflow">return</font> result;
00110 }
00111
00112 <font class="preprocessor">#elif defined(macintosh)</font>
00113 <font class="preprocessor"></font>
00114 <font class="keyword">static</font> <font class="keywordtype">int</font> truncate(<font class="keyword">const</font> <font class="keywordtype">char</font> *path, size_t length)
00115 {
00116 <font class="comment">/* not implemented on the Mac */</font>
00117 <font class="keywordflow">return</font> -1;
00118 }
00119
00120 <font class="preprocessor">#endif</font>
00121 <font class="preprocessor"></font>
<a name="l00122"></a><a class="code" href="class_i_d3___tag_impl.html#a39">00122</a> size_t <a class="code" href="class_i_d3___tag_impl.html#a18">ID3_TagImpl::Link</a>(<font class="keyword">const</font> <font class="keywordtype">char</font> *fileInfo, <font class="keywordtype">bool</font> parseID3v1, <font class="keywordtype">bool</font> parseLyrics3)
00123 {
00124 <a class="code" href="globals_8h.html#a40">flags_t</a> tt = <a class="code" href="globals_8h.html#a217a59">ID3TT_NONE</a>;
00125 <font class="keywordflow">if</font> (parseID3v1)
00126 {
00127 tt |= <a class="code" href="globals_8h.html#a217a60">ID3TT_ID3V1</a>;
00128 }
00129 <font class="keywordflow">if</font> (parseLyrics3)
00130 {
00131 tt |= <a class="code" href="globals_8h.html#a217a65">ID3TT_LYRICS</a>;
00132 }
00133 <font class="keywordflow">return</font> this-><a class="code" href="class_i_d3___tag_impl.html#a18">Link</a>(fileInfo, tt);
00134 }
00135
<a name="l00136"></a><a class="code" href="class_i_d3___tag_impl.html#a18">00136</a> size_t <a class="code" href="class_i_d3___tag_impl.html#a18">ID3_TagImpl::Link</a>(<font class="keyword">const</font> <font class="keywordtype">char</font> *fileInfo, <a class="code" href="globals_8h.html#a40">flags_t</a> tag_types)
00137 {
00138 _tags_to_parse.<a class="code" href="class_i_d3___flags.html#a4">set</a>(tag_types);
00139
00140 <font class="keywordflow">if</font> (<a class="code" href="globals_8h.html#a24">NULL</a> == fileInfo)
00141 {
00142 <font class="keywordflow">return</font> 0;
00143 }
00144
00145 _file_name = fileInfo;
00146 _changed = <font class="keyword">true</font>;
00147
00148 this-><a class="code" href="class_i_d3___tag_impl.html#b3">ParseFile</a>();
00149
00150 <font class="keywordflow">return</font> this-><a class="code" href="class_i_d3___tag_impl.html#a21">GetPrependedBytes</a>();
00151 }
00152
<a name="l00153"></a><a class="code" href="tag__file_8cpp.html#a0">00153</a> size_t <a class="code" href="tag__file_8cpp.html#a0">RenderV1ToFile</a>(<a class="code" href="class_i_d3___tag_impl.html">ID3_TagImpl</a>& tag, fstream& file)
00154 {
00155 <font class="keywordflow">if</font> (!file)
00156 {
00157 <font class="keywordflow">return</font> 0;
00158 }
00159
00160 <font class="comment">// Heck no, this is stupid. If we do not read in an initial V1(.1)</font>
00161 <font class="comment">// header then we are constantly appending new V1(.1) headers. Files</font>
00162 <font class="comment">// can get very big that way if we never overwrite the old ones.</font>
00163 <font class="comment">// if (ID3_V1_LEN > tag.GetAppendedBytes()) - Daniel Hazelbaker</font>
00164 <font class="keywordflow">if</font> (<a class="code" href="globals_8h.html#a220a173">ID3_V1_LEN</a> > tag.<a class="code" href="class_i_d3___tag_impl.html#a23">GetFileSize</a>())
00165 {
00166 file.seekp(0, ios::end);
00167 }
00168 <font class="keywordflow">else</font>
00169 {
00170 <font class="comment">// We want to check if there is already an id3v1 tag, so we can write over</font>
00171 <font class="comment">// it. First, seek to the beginning of any possible id3v1 tag</font>
00172 file.seekg(0-<a class="code" href="globals_8h.html#a220a173">ID3_V1_LEN</a>, ios::end);
00173 <font class="keywordtype">char</font> sID[<a class="code" href="globals_8h.html#a220a174">ID3_V1_LEN_ID</a>];
00174
00175 <font class="comment">// Read in the TAG characters</font>
00176 file.read(sID, <a class="code" href="globals_8h.html#a220a174">ID3_V1_LEN_ID</a>);
00177
00178 <font class="comment">// If those three characters are TAG, then there's a preexisting id3v1 tag,</font>
00179 <font class="comment">// so we should set the file cursor so we can overwrite it with a new tag.</font>
00180 <font class="keywordflow">if</font> (memcmp(sID, <font class="stringliteral">"TAG"</font>, <a class="code" href="globals_8h.html#a220a174">ID3_V1_LEN_ID</a>) == 0)
00181 {
00182 file.seekp(0-<a class="code" href="globals_8h.html#a220a173">ID3_V1_LEN</a>, ios::end);
00183 }
00184 <font class="comment">// Otherwise, set the cursor to the end of the file so we can append on </font>
00185 <font class="comment">// the new tag.</font>
00186 <font class="keywordflow">else</font>
00187 {
00188 file.seekp(0, ios::end);
00189 }
00190 }
00191
00192 <a class="code" href="class_i_d3___i_o_stream_writer.html">ID3_IOStreamWriter</a> out(file);
00193
00194 id3::v1::render(out, tag);
00195
00196 <font class="keywordflow">return</font> <a class="code" href="globals_8h.html#a220a173">ID3_V1_LEN</a>;
00197 }
00198
<a name="l00199"></a><a class="code" href="tag__file_8cpp.html#a1">00199</a> size_t <a class="code" href="tag__file_8cpp.html#a1">RenderV2ToFile</a>(<font class="keyword">const</font> <a class="code" href="class_i_d3___tag_impl.html">ID3_TagImpl</a>& tag, fstream& file)
00200 {
00201 ID3D_NOTICE( <font class="stringliteral">"RenderV2ToFile: starting"</font> );
00202 <font class="keywordflow">if</font> (!file)
00203 {
00204 ID3D_WARNING( <font class="stringliteral">"RenderV2ToFile: error in file"</font> );
00205 <font class="keywordflow">return</font> 0;
00206 }
00207
00208 String tagString;
00209 io::StringWriter writer(tagString);
00210 id3::v2::render(writer, tag);
00211 ID3D_NOTICE( <font class="stringliteral">"RenderV2ToFile: rendered v2"</font> );
00212
00213 <font class="keyword">const</font> <font class="keywordtype">char</font>* tagData = tagString.data();
00214 size_t tagSize = tagString.size();
00215
00216 <font class="comment">// if the new tag fits perfectly within the old and the old one</font>
00217 <font class="comment">// actually existed (ie this isn't the first tag this file has had)</font>
00218 <font class="keywordflow">if</font> ((!tag.<a class="code" href="class_i_d3___tag_impl.html#a21">GetPrependedBytes</a>() && !<a class="code" href="tag__impl_8h.html#a0">ID3_GetDataSize</a>(tag)) ||
00219 (tagSize == tag.<a class="code" href="class_i_d3___tag_impl.html#a21">GetPrependedBytes</a>()))
00220 {
00221 file.seekp(0, ios::beg);
00222 file.write(tagData, tagSize);
00223 }
00224 <font class="keywordflow">else</font>
00225 {
00226 String filename = tag.<a class="code" href="class_i_d3___tag_impl.html#a24">GetFileName</a>();
00227 <font class="preprocessor">#if !defined HAVE_MKSTEMP</font>
00228 <font class="preprocessor"></font> <font class="comment">// This section is for Windows folk</font>
00229
00230 FILE *tempOut = tmpfile();
00231 <font class="keywordflow">if</font> (<a class="code" href="globals_8h.html#a24">NULL</a> == tempOut)
00232 {
00233 <font class="comment">// log this</font>
00234 <font class="keywordflow">return</font> 0;
00235 <font class="comment">//ID3_THROW(ID3E_ReadOnly);</font>
00236 }
00237
00238 fwrite(tagData, 1, tagSize, tempOut);
00239
00240 file.seekg(tag.<a class="code" href="class_i_d3___tag_impl.html#a21">GetPrependedBytes</a>(), ios::beg);
00241
00242 <a class="code" href="globals_8h.html#a33">uchar</a> tmpBuffer[BUFSIZ];
00243 <font class="keywordflow">while</font> (!file.eof())
00244 {
00245 file.read((<font class="keywordtype">char</font> *)tmpBuffer, BUFSIZ);
00246 size_t nBytes = file.gcount();
00247 fwrite(tmpBuffer, 1, nBytes, tempOut);
00248 }
00249
00250 rewind(tempOut);
00251 openWritableFile(filename, file);
00252
00253 <font class="keywordflow">while</font> (!feof(tempOut))
00254 {
00255 size_t nBytes = fread((<font class="keywordtype">char</font> *)tmpBuffer, 1, BUFSIZ, tempOut);
00256 file.write((<font class="keywordtype">char</font> *)tmpBuffer, nBytes);
00257 }
00258
00259 fclose(tempOut);
00260
00261 <font class="preprocessor">#else</font>
00262 <font class="preprocessor"></font>
00263 <font class="comment">// else we gotta make a temp file, copy the tag into it, copy the</font>
00264 <font class="comment">// rest of the old file after the tag, delete the old file, rename</font>
00265 <font class="comment">// this new file to the old file's name and update the handle</font>
00266 String sTmpSuffix = <font class="stringliteral">".XXXXXX"</font>;
00267 <font class="keywordflow">if</font> (filename.size() + sTmpSuffix.size() > ID3_PATH_LENGTH)
00268 {
00269 <font class="comment">// log this</font>
00270 <font class="keywordflow">return</font> 0;
00271 <font class="comment">//ID3_THROW_DESC(ID3E_NoFile, "filename too long");</font>
00272 }
00273 <font class="keywordtype">char</font> sTempFile[ID3_PATH_LENGTH];
00274 strcpy(sTempFile, filename.c_str());
00275 strcat(sTempFile, sTmpSuffix.c_str());
00276
00277 <font class="keywordtype">int</font> fd = mkstemp(sTempFile);
00278 <font class="keywordflow">if</font> (fd < 0)
00279 {
00280 remove(sTempFile);
00281 <font class="comment">//ID3_THROW_DESC(ID3E_NoFile, "couldn't open temp file");</font>
00282 }
00283
00284 ofstream tmpOut(fd);
00285 <font class="keywordflow">if</font> (!tmpOut)
00286 {
00287 tmpOut.close();
00288 remove(sTempFile);
00289 <font class="keywordflow">return</font> 0;
00290 <font class="comment">// log this</font>
00291 <font class="comment">//ID3_THROW(ID3E_ReadOnly);</font>
00292 }
00293
00294 tmpOut.write(tagData, tagSize);
00295 file.seekg(tag.<a class="code" href="class_i_d3___tag_impl.html#a21">GetPrependedBytes</a>(), ios::beg);
00296 <a class="code" href="globals_8h.html#a33">uchar</a> tmpBuffer[BUFSIZ];
00297 <font class="keywordflow">while</font> (file)
00298 {
00299 file.read(tmpBuffer, BUFSIZ);
00300 size_t nBytes = file.gcount();
00301 tmpOut.write(tmpBuffer, nBytes);
00302 }
00303
00304 tmpOut.close();
00305
00306 file.close();
00307
00308 remove(filename.c_str());
00309 rename(sTempFile, filename.c_str());
00310
00311 openWritableFile(filename, file);
00312 <font class="preprocessor">#endif</font>
00313 <font class="preprocessor"></font> }
00314
00315 <font class="keywordflow">return</font> tagSize;
00316 }
00317
00318
<a name="l00319"></a><a class="code" href="class_i_d3___tag_impl.html#a19">00319</a> <a class="code" href="globals_8h.html#a40">flags_t</a> <a class="code" href="class_i_d3___tag_impl.html#a19">ID3_TagImpl::Update</a>(<a class="code" href="globals_8h.html#a40">flags_t</a> ulTagFlag)
00320 {
00321 <a class="code" href="globals_8h.html#a40">flags_t</a> tags = <a class="code" href="globals_8h.html#a217a59">ID3TT_NONE</a>;
00322
00323 fstream file;
00324 String filename = this-><a class="code" href="class_i_d3___tag_impl.html#a24">GetFileName</a>();
00325 <a class="code" href="globals_8h.html#a223">ID3_Err</a> err = openWritableFile(filename, file);
00326 _file_size = getFileSize(file);
00327
00328 <font class="keywordflow">if</font> (err == <a class="code" href="globals_8h.html#a223a202">ID3E_NoFile</a>)
00329 {
00330 err = createFile(filename, file);
00331 }
00332 <font class="keywordflow">if</font> (err == <a class="code" href="globals_8h.html#a223a203">ID3E_ReadOnly</a>)
00333 {
00334 <font class="keywordflow">return</font> tags;
00335 }
00336
00337 <font class="keywordflow">if</font> ((ulTagFlag & <a class="code" href="globals_8h.html#a217a61">ID3TT_ID3V2</a>) && this-><a class="code" href="class_i_d3___tag_impl.html#a4">HasChanged</a>())
00338 {
00339 _prepended_bytes = <a class="code" href="tag__file_8cpp.html#a1">RenderV2ToFile</a>(*<font class="keyword">this</font>, file);
00340 <font class="keywordflow">if</font> (_prepended_bytes)
00341 {
00342 tags |= <a class="code" href="globals_8h.html#a217a61">ID3TT_ID3V2</a>;
00343 }
00344 }
00345
00346 <font class="keywordflow">if</font> ((ulTagFlag & <a class="code" href="globals_8h.html#a217a60">ID3TT_ID3V1</a>) &&
00347 (!this-><a class="code" href="class_i_d3___tag_impl.html#a31">HasTagType</a>(<a class="code" href="globals_8h.html#a217a60">ID3TT_ID3V1</a>) || this-><a class="code" href="class_i_d3___tag_impl.html#a4">HasChanged</a>()))
00348 {
00349 size_t tag_bytes = <a class="code" href="tag__file_8cpp.html#a0">RenderV1ToFile</a>(*<font class="keyword">this</font>, file);
00350 <font class="keywordflow">if</font> (tag_bytes)
00351 {
00352 <font class="comment">// only add the tag_bytes if there wasn't an id3v1 tag before</font>
00353 <font class="keywordflow">if</font> (! _file_tags.<a class="code" href="class_i_d3___flags.html#a3">test</a>(<a class="code" href="globals_8h.html#a217a60">ID3TT_ID3V1</a>))
00354 {
00355 _appended_bytes += tag_bytes;
00356 }
00357 tags |= <a class="code" href="globals_8h.html#a217a60">ID3TT_ID3V1</a>;
00358 }
00359 }
00360 _changed = <font class="keyword">false</font>;
00361 _file_tags.<a class="code" href="class_i_d3___flags.html#a5">add</a>(tags);
00362 _file_size = getFileSize(file);
00363 file.close();
00364 <font class="keywordflow">return</font> tags;
00365 }
00366
<a name="l00367"></a><a class="code" href="class_i_d3___tag_impl.html#a20">00367</a> <a class="code" href="globals_8h.html#a40">flags_t</a> <a class="code" href="class_i_d3___tag_impl.html#a20">ID3_TagImpl::Strip</a>(<a class="code" href="globals_8h.html#a40">flags_t</a> ulTagFlag)
00368 {
00369 <a class="code" href="globals_8h.html#a40">flags_t</a> ulTags = <a class="code" href="globals_8h.html#a217a59">ID3TT_NONE</a>;
00370 <font class="keyword">const</font> size_t data_size = <a class="code" href="tag__impl_8h.html#a0">ID3_GetDataSize</a>(*<font class="keyword">this</font>);
00371
00372 <font class="comment">// First remove the v2 tag, if requested</font>
00373 <font class="keywordflow">if</font> (ulTagFlag & <a class="code" href="globals_8h.html#a217a68">ID3TT_PREPENDED</a> & _file_tags.<a class="code" href="class_i_d3___flags.html#a2">get</a>())
00374 {
00375 fstream file;
00376 <font class="keywordflow">if</font> (<a class="code" href="globals_8h.html#a223a191">ID3E_NoError</a> != openWritableFile(this->GetFileName(), file))
00377 {
00378 <font class="keywordflow">return</font> ulTags;
00379 }
00380 _file_size = getFileSize(file);
00381
00382 <font class="comment">// We will remove the id3v2 tag in place: since it comes at the beginning</font>
00383 <font class="comment">// of the file, we'll effectively move all the data that comes after the</font>
00384 <font class="comment">// tag back n bytes, where n is the size of the id3v2 tag. Once we've</font>
00385 <font class="comment">// copied the data, we'll truncate the file.</font>
00386 file.seekg(this->GetPrependedBytes(), ios::beg);
00387
00388 <a class="code" href="globals_8h.html#a33">uchar</a> aucBuffer[BUFSIZ];
00389
00390 <font class="comment">// The nBytesRemaining variable indicates how many bytes are to be copied</font>
00391 size_t nBytesToCopy = data_size;
00392
00393 <font class="comment">// Here we increase the nBytesToCopy by the size of any tags that appear</font>
00394 <font class="comment">// at the end of the file if we don't want to strip them</font>
00395 <font class="keywordflow">if</font> (!(ulTagFlag & <a class="code" href="globals_8h.html#a217a69">ID3TT_APPENDED</a>))
00396 {
00397 nBytesToCopy += this-><a class="code" href="class_i_d3___tag_impl.html#a22">GetAppendedBytes</a>();
00398 }
00399
00400 <font class="comment">// The nBytesRemaining variable indicates how many bytes are left to be </font>
00401 <font class="comment">// moved in the actual file.</font>
00402 <font class="comment">// The nBytesCopied variable keeps track of how many actual bytes were</font>
00403 <font class="comment">// copied (or moved) so far.</font>
00404 size_t
00405 nBytesRemaining = nBytesToCopy,
00406 nBytesCopied = 0;
00407 <font class="keywordflow">while</font> (!file.eof())
00408 {
00409 size_t nBytesToRead = dami::min<size_t>(nBytesRemaining - nBytesCopied, BUFSIZ);
00410 file.read((<font class="keywordtype">char</font> *)aucBuffer, nBytesToRead);
00411 size_t nBytesRead = file.gcount();
00412
00413 <font class="keywordflow">if</font> (nBytesRead != nBytesToRead)
00414 {
00415 <font class="comment">// TODO: log this</font>
00416 <font class="comment">//cerr << "--- attempted to write " << nBytesRead << " bytes, "</font>
00417 <font class="comment">// << "only wrote " << nBytesWritten << endl;</font>
00418 }
00419 <font class="keywordflow">if</font> (nBytesRead > 0)
00420 {
00421 <font class="keywordtype">long</font> offset = nBytesRead + this-><a class="code" href="class_i_d3___tag_impl.html#a21">GetPrependedBytes</a>();
00422 file.seekp(-offset, ios::cur);
00423 file.write((<font class="keywordtype">char</font> *)aucBuffer, nBytesRead);
00424 file.seekg(this->GetPrependedBytes(), ios::cur);
00425 nBytesCopied += nBytesRead;
00426 }
00427
00428 <font class="keywordflow">if</font> (nBytesCopied == nBytesToCopy || nBytesToRead < BUFSIZ)
00429 {
00430 <font class="keywordflow">break</font>;
00431 }
00432 }
00433 file.close();
00434 }
00435
00436 size_t nNewFileSize = data_size;
00437
00438 <font class="keywordflow">if</font> ((_file_tags.<a class="code" href="class_i_d3___flags.html#a2">get</a>() & <a class="code" href="globals_8h.html#a217a69">ID3TT_APPENDED</a>) && (ulTagFlag & <a class="code" href="globals_8h.html#a217a69">ID3TT_APPENDED</a>))
00439 {
00440 ulTags |= _file_tags.<a class="code" href="class_i_d3___flags.html#a2">get</a>() & <a class="code" href="globals_8h.html#a217a69">ID3TT_APPENDED</a>;
00441 }
00442 <font class="keywordflow">else</font>
00443 {
00444 <font class="comment">// if we're not stripping the appended tags, be sure to increase the file</font>
00445 <font class="comment">// size by those bytes</font>
00446 nNewFileSize += this-><a class="code" href="class_i_d3___tag_impl.html#a22">GetAppendedBytes</a>();
00447 }
00448
00449 <font class="keywordflow">if</font> ((ulTagFlag & <a class="code" href="globals_8h.html#a217a68">ID3TT_PREPENDED</a>) && (_file_tags.<a class="code" href="class_i_d3___flags.html#a2">get</a>() & <a class="code" href="globals_8h.html#a217a68">ID3TT_PREPENDED</a>))
00450 {
00451 <font class="comment">// If we're stripping the ID3v2 tag, there's no need to adjust the new</font>
00452 <font class="comment">// file size, since it doesn't account for the ID3v2 tag size</font>
00453 ulTags |= _file_tags.<a class="code" href="class_i_d3___flags.html#a2">get</a>() & <a class="code" href="globals_8h.html#a217a68">ID3TT_PREPENDED</a>;
00454 }
00455 <font class="keywordflow">else</font>
00456 {
00457 <font class="comment">// add the original prepended tag size since we don't want to delete it,</font>
00458 <font class="comment">// and the new file size represents the file size _not_ counting the ID3v2</font>
00459 <font class="comment">// tag</font>
00460 nNewFileSize += this-><a class="code" href="class_i_d3___tag_impl.html#a21">GetPrependedBytes</a>();
00461 }
00462
00463 <font class="keywordflow">if</font> (ulTags && (truncate(_file_name.c_str(), nNewFileSize) == -1))
00464 {
00465 <font class="comment">// log this</font>
00466 <font class="keywordflow">return</font> 0;
00467 <font class="comment">//ID3_THROW(ID3E_NoFile);</font>
00468 }
00469
00470 _prepended_bytes = (ulTags & <a class="code" href="globals_8h.html#a217a68">ID3TT_PREPENDED</a>) ? 0 : _prepended_bytes;
00471 _appended_bytes = (ulTags & <a class="code" href="globals_8h.html#a217a69">ID3TT_APPENDED</a>) ? 0 : _appended_bytes;
00472 _file_size = data_size + _prepended_bytes + _appended_bytes;
00473
00474 _changed = _file_tags.<a class="code" href="class_i_d3___flags.html#a6">remove</a>(ulTags) || _changed;
00475
00476 <font class="keywordflow">return</font> ulTags;
00477 }
</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>
</body>
</html>
distrib
>
Mandriva
>
8.2
>
i586
>
media
>
contrib
>
by-pkgid
>
2c9d30f3cf217a6cae41860ebc0d6704
>
files
>
187
