id3lib 3.8.3
tag_parse_v1.cpp
Go to the documentation of this file.
1// $Id: tag_parse_v1.cpp,v 1.27 2002/07/31 13:45:18 t1mpy Exp $
2
3// id3lib: a C++ library for creating and manipulating id3v1/v2 tags
4// Copyright 1999, 2000 Scott Thomas Haug
5// Copyright 2002 Thijmen Klok (thijmen@id3lib.org)
6
7// This library is free software; you can redistribute it and/or modify it
8// under the terms of the GNU Library General Public License as published by
9// the Free Software Foundation; either version 2 of the License, or (at your
10// option) any later version.
11//
12// This library is distributed in the hope that it will be useful, but WITHOUT
13// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14// FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
15// License for more details.
16//
17// You should have received a copy of the GNU Library General Public License
18// along with this library; if not, write to the Free Software Foundation,
19// Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20
21// The id3lib authors encourage improvements and optimisations to be sent to
22// the id3lib coordinator. Please see the README file for details on where to
23// send such submissions. See the AUTHORS file for a list of people who have
24// contributed to id3lib. See the ChangeLog file for a list of changes to
25// id3lib. These files are distributed with id3lib at
26// http://download.sourceforge.net/id3lib/
27
28#include "tag_impl.h" //has <stdio.h> "tag.h" "header_tag.h" "frame.h" "field.h" "spec.h" "id3lib_strings.h" "utils.h"
29#include "helpers.h"
30#include "id3/io_decorators.h" //has "readers.h" "io_helpers.h" "utils.h"
31#include "io_strings.h"
32
33using namespace dami;
34
36{
37 io::ExitTrigger et(reader);
38
39 ID3_Reader::pos_type end = reader.getCur();
40 // posn ourselves at 128 bytes from the current position
41 if (end < reader.getBeg() + ID3_V1_LEN)
42 {
43 ID3D_NOTICE( "id3::v1::parse: not enough bytes to parse, pos = " << end );
44 return false;
45 }
46 reader.setCur(end - ID3_V1_LEN);
47 ID3_Reader::pos_type beg = reader.getCur();
48 //file.seekg(-static_cast<long>(ID3_V1_LEN), ios::cur);
49 if (end != beg + ID3_V1_LEN)
50 {
51 ID3D_WARNING( "id3::v1::parse: failed to reposition " << ID3_V1_LEN <<
52 " bytes" );
53 return false;
54 }
55
56 // read the next 128 bytes in;
57 String field = io::readText(reader, ID3_V1_LEN_ID);
58
59 // check to see if it was a tag
60 if (field != "TAG")
61 {
62 return false;
63 }
64 et.setExitPos(beg);
65
66 // guess so, let's start checking the v2 tag for frames which are the
67 // equivalent of the v1 fields. When we come across a v1 field that has
68 // no current equivalent v2 frame, we create the frame, copy the data
69 // from the v1 frame and attach it to the tag
70
71 // (Scott Wheeler) The above comment was nice in theory, but it wasn't
72 // first checking (before my hacks) to see if there already was v2 data.
73
74 ID3D_NOTICE("id3::v1::parse: read bytes: " << reader.getCur() - beg);
75 String title = io::readTrailingSpaces(reader, ID3_V1_LEN_TITLE);
76 field = id3::v2::getTitle(tag);
77 if (title.size() > 0 && (field.size() == 0 || field == ""))
78 {
79 id3::v2::setTitle(tag, title);
80 }
81 ID3D_NOTICE( "id3::v1::parse: title = \"" << title << "\"" );
82
83 ID3D_NOTICE("id3::v1::parse: read bytes: " << reader.getCur() - beg);
84 String artist = io::readTrailingSpaces(reader, ID3_V1_LEN_ARTIST);
85 field = id3::v2::getArtist(tag);
86 if (artist.size() > 0 && (field.size() == 0 || field == ""))
87 {
88 id3::v2::setArtist(tag, artist);
89 }
90 ID3D_NOTICE( "id3::v1::parse: artist = \"" << artist << "\"" );
91
92 ID3D_NOTICE("id3::v1::parse: read bytes: " << reader.getCur() - beg);
93 String album = io::readTrailingSpaces(reader, ID3_V1_LEN_ALBUM);
94 field = id3::v2::getAlbum(tag);
95 if (album.size() > 0 && (field.size() == 0 || field == ""))
96 {
97 id3::v2::setAlbum(tag, album);
98 }
99 ID3D_NOTICE( "id3::v1::parse: album = \"" << title << "\"" );
100
101 ID3D_NOTICE("id3::v1::parse: read bytes: " << reader.getCur() - beg);
102 String year = io::readTrailingSpaces(reader, ID3_V1_LEN_YEAR);
103 field = id3::v2::getYear(tag);
104 if (year.size() > 0 && (field.size() == 0 || field == ""))
105 {
106 id3::v2::setYear(tag, year);
107 }
108 ID3D_NOTICE( "id3::v1::parse: year = \"" << year << "\"" );
109
110 ID3D_NOTICE("id3::v1::parse: read bytes: " << reader.getCur() - beg);
111 String comment = io::readTrailingSpaces(reader, ID3_V1_LEN_COMMENT-2);
112 // fixes bug for when tracknumber is 0x20
113 BString trackno = io::readBinary(reader, ID3_V1_LEN_COMMENT-28);
114 if (trackno[0] == '\0')
115 {
116 if (trackno[1] != '\0')
117 { //we've got a tracknumber
118 size_t track = trackno[1];
119 field = id3::v2::getTrack(tag);
120 if (field.size() == 0 || field == "00")
121 {
122 id3::v2::setTrack(tag, track, 0);
123 }
124 ID3D_NOTICE( "id3::v1::parse: track = \"" << track << "\"" );
125 ID3D_NOTICE( "id3::v1::parse: comment length = \"" << comment.length() << "\"" );
126 }
127 }
128 else
129 {
130 // trackno[0] != '\0'
131 const int paddingsize = (ID3_V1_LEN_COMMENT-2) - comment.size();
132 const char * padding = " "; //28 spaces
133
134 if (trackno[1] == '\0' || trackno[1] == 0x20 && trackno[0] != 0x20)
135 {
136 // if there used to be spaces they are gone now, we need to rebuild them
137 comment.append(padding, paddingsize);
138 comment.append((const char *)trackno.data(), 1);
139 }
140 else if (trackno[1] != '\0' && trackno[1] != 0x20 && trackno[0] != 0x20)
141 {
142 // if there used to be spaces they are gone now, we need to rebuild them
143 comment.append(padding, paddingsize);
144 comment.append((const char *)trackno.data(), 2);
145 }
146 }
147 ID3D_NOTICE( "id3::v1::parse: comment = \"" << comment << "\"" );
148 if (comment.size() > 0)
149 {
150 id3::v2::setComment(tag, comment, STR_V1_COMMENT_DESC, "XXX");
151 }
152
153 ID3D_NOTICE("id3::v1::parse: read bytes: " << reader.getCur() - beg);
154 // the GENRE field/frame
155 uchar genre = reader.readChar();
156 field = id3::v2::getGenre(tag);
157 if (genre != 0xFF && (field.size() == 0 || field == ""))
158 {
159 id3::v2::setGenre(tag, genre);
160 }
161 ID3D_NOTICE( "id3::v1::parse: genre = \"" << (int) genre << "\"" );
162
163 ID3D_NOTICE("id3::v1::parse: read bytes: " << reader.getCur() - beg);
164 return true;
165}
166
167
virtual pos_type setCur(pos_type pos)=0
Set the value of the current position for reading.
virtual pos_type getCur()=0
Return the current position in the reader.
virtual int_type readChar()
Read a single character and advance the internal position.
Definition reader.h:65
uint32 pos_type
Definition reader.h:38
virtual pos_type getBeg()
Return the beginning position in the reader.
Definition reader.h:48
#define STR_V1_COMMENT_DESC
String used for the description field of a comment tag converted from an id3v1 tag to an id3v2 tag.
Definition globals.h:111
unsigned char uchar
Definition globals.h:114
@ ID3_V1_LEN_YEAR
Definition globals.h:336
@ ID3_V1_LEN_ARTIST
Definition globals.h:334
@ ID3_V1_LEN_ALBUM
Definition globals.h:335
@ ID3_V1_LEN
Definition globals.h:331
@ ID3_V1_LEN_ID
Definition globals.h:332
@ ID3_V1_LEN_TITLE
Definition globals.h:333
@ ID3_V1_LEN_COMMENT
Definition globals.h:337
bool parse(ID3_TagImpl &, ID3_Reader &)

Generated for id3lib by doxygen 1.10.0