1 | ###########################################################################
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2 | #
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3 | # Code by Xin Gao based on the Ogg::Vorbis::Header::PurePerl module by
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4 | # Andrew Molloy (GNU General Public Licensed)
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5 | #
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6 | # A component of the Greenstone digital library software
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7 | # from the New Zealand Digital Library Project at the
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8 | # University of Waikato, New Zealand.
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9 | #
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10 | # Copyright (C) 2005 New Zealand Digital Library Project
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11 | #
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12 | # This program is free software; you can redistribute it and/or modify
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13 | # it under the terms of the GNU General Public License as published by
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14 | # the Free Software Foundation; either version 2 of the License, or
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15 | # (at your option) any later version.
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16 | #
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17 | # This program is distributed in the hope that it will be useful,
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18 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 | # GNU General Public License for more details.
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21 | #
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22 | # You should have received a copy of the GNU General Public License
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23 | # along with this program; if not, write to the Free Software
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24 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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25 | #
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26 | ###########################################################################
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27 |
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28 | package rm::Header::PurePerl;
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29 |
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30 | use 5.005;
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31 | use strict;
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32 | use warnings;
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33 |
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34 | use Fcntl qw/SEEK_END/;
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35 |
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36 | our $VERSION = '0.07';
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37 |
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38 | sub new
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39 | {
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40 | my $class = shift;
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41 | my $file = shift;
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42 |
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43 | return load($class, $file);
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44 | }
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45 |
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46 | sub load
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47 | {
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48 | my $class = shift;
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49 | my $file = shift;
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50 | my $from_new = shift;
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51 | my %data;
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52 | my $self;
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53 |
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54 | # there must be a better way...
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55 | if ($class eq 'rm::Header::PurePerl')
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56 | {
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57 | $self = bless \%data, $class;
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58 | }
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59 | else
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60 | {
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61 | $self = $class;
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62 | }
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63 |
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64 | if ($self->{'FILE_LOADED'})
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65 | {
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66 | return $self;
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67 | }
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68 |
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69 | $self->{'FILE_LOADED'} = 1;
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70 |
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71 | # check that the file exists and is readable
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72 | unless ( -e $file && -r _ )
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73 | {
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74 | warn "File does not exist or cannot be read.";
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75 | # file does not exist, can't do anything
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76 | return undef;
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77 | }
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78 | # open up the file
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79 | open FILE, $file;
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80 | # make sure dos-type systems can handle it...
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81 | binmode FILE;
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82 |
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83 | $data{'filename'} = $file;
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84 | $data{'fileHandle'} = \*FILE;
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85 |
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86 | _loadInfo(\%data);
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87 |
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88 | close FILE;
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89 |
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90 | return $self;
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91 | }
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92 |
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93 | sub info
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94 | {
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95 | my $self = shift;
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96 | my $key = shift;
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97 |
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98 | # if the user did not supply a key, return the entire hash
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99 | unless ($key)
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100 | {
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101 | return $self->{'INFO'};
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102 | }
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103 |
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104 | # otherwise, return the value for the given key
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105 | return $self->{'INFO'}{lc $key};
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106 | }
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107 |
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108 | sub _loadInfo
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109 | {
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110 | my $data = shift;
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111 | my $start = 0;
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112 | my $fh = $data->{'fileHandle'};
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113 | my $buffer;
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114 | my $byteCount = $start;
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115 | my %info;
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116 |
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117 | # check that the first four bytes are '.RMF'
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118 | read($fh, $buffer, 4);
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119 | if ($buffer ne '.RMF')
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120 | {
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121 | warn "No RMF header?";
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122 | return undef;
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123 | }
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124 |
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125 | $buffer='';
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126 | my $char;
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127 |
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128 | #find the header
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129 | my $bytes = "DATA";
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130 | my @byteList = split //, $bytes;
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131 | my $numBytes = @byteList;
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132 | my $i;
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133 |
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134 | LINE: while (1){
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135 | INNER: for ($i = 0; $i < $numBytes; $i ++)
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136 | {
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137 | unless ( read($fh, $char, 1) ) {last LINE ;}
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138 | # Find out all of char
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139 | $buffer= $buffer.$char;
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140 |
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141 | if (ord($char) != ord($byteList[$i]) )
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142 | {last INNER ;}
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143 | }
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144 | if ($i == $numBytes) {last LINE ;} #jump out the while loop
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145 | }
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146 |
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147 | #find the tail
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148 | $bytes = "INDX";
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149 | @byteList = split //, $bytes;
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150 | $numBytes = @byteList;
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151 |
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152 | my $isrecord=0;
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153 | LINE: while (read($fh, $char, 1)){
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154 | if ($isrecord) {
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155 | # Find out all of char
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156 | $buffer= $buffer.$char;
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157 | }else
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158 | {
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159 | INNER: for ($i = 0; $i < $numBytes; $i ++)
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160 | {
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161 | if (ord($char) != ord($byteList[$i]) ) {last INNER ;}
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162 | unless ( read($fh, $char, 1) ) {last LINE ;}
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163 | }
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164 | if ($i == $numBytes) {$isrecord = 1;} #start record
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165 | }
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166 | }
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167 |
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168 | my @cliptype = (
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169 |
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170 | #add clip type here
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171 | "Comments",
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172 | "Keywords",
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173 | "Category",
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174 | "MimeType",# title
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175 | "Lyrics",
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176 | "Artist",
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177 | "CD Track #",
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178 | "Album",
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179 | "Extension",
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180 | "Genre",
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181 | "Statistics",
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182 | "PROP",
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183 | "MDPR",
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184 | "Target Audiences",
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185 | "Audio Format",
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186 | "Creation Date",
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187 | "Modification Date",
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188 | "Generated By",
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189 | "Abstract",
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190 | "Content Rating",
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191 | "File ID",
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192 | "CONT",
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193 | "Audio Stream",
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194 | "Video Stream",
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195 | "Title"
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196 | );
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197 |
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198 | for my $j ( 1 .. scalar(@cliptype) ) {
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199 | $info{$cliptype[$j - 1]} = _loadInfor($buffer,$cliptype[$j - 1]);
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200 | }
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201 |
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202 | $data->{'INFO'} = \%info;
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203 | }
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204 |
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205 | #search for the element name and value
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206 | sub _loadInfor
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207 | {my $data = shift;
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208 | my $item = shift;
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209 |
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210 | my @byteList = split //, $data;
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211 | my $startbyte = 0;
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212 |
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213 |
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214 | my $isrecord;
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215 | my $data2 = "";
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216 | my $char;
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217 | my $item2 = "";
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218 | if ( $item eq "Title") {$item2 = $item; $item = "MimeType";}
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219 |
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220 |
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221 | OUT: while(index($data, $item, $startbyte) != -1){
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222 | $startbyte = index($data, $item, $startbyte);
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223 | $isrecord=0;
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224 |
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225 | $startbyte += length($item);
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226 |
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227 | if(ord($byteList[$startbyte]) == 0 or ord($byteList[$startbyte]) == 0x14){
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228 | if ( $item eq "Album" or $item eq "Artist" or $item2 eq "Title"){
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229 | if ( index($data,"Name",$startbyte) != -1) {
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230 | $startbyte = index($data,"Name",$startbyte);
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231 | $startbyte += length("Name");
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232 | }else {next OUT;}
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233 | }
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234 |
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235 | if ($data2 ne "") {$data2 = $data2."; ";}
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236 |
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237 | LINE: while (1){
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238 | $char = $byteList[++$startbyte];
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239 |
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240 | if (ord($char) >= 32 and ord($char) <= 126)
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241 | {
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242 | $isrecord=1; #record the string started
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243 | $data2 = $data2.$char;
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244 | }else{
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245 | if ( $isrecord == 1 ) {last LINE ;}# stop at the end of string
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246 | }
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247 | }# end LINE: while
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248 |
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249 | }# end if
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250 | }# end while
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251 |
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252 | return $data2;
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253 | }
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254 |
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255 | 1;
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