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As we talked about, the ID3 v1.1 tag is actually not part of the MP3 data at all. Although not all MP3 files will have an ID3 tag, if one does, it is tacked onto the end of the MP3 file. This means that you do not have to actually parse binary data to read the tag. To read the data, you just have to seek to the end of the file and then back up 128 bytes. This is an elegant solution to the problem of providing metadata in a file without changing the file format in a fundamental way. The problem with this kind of tag, though, is that the data is structured within the tag in fixed-length fields, which makes it difficult to extend for future functionality. It does make it easier to process the structure of the tag, however, because you know exactly where the fields will be, how long they are, and what they contain.

Absolute positioning allows you to detach an element from the rest of the page and basically move it around the browser window by assigning x,y coordinates in the style. The coordinates start at 0,0, which is the top left corner of the browser s available page display area (see Figure 6-12).

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class LogsController < ApplicationController def upload flash[:notice] = "Uploaded new file... \n" count=0 if params[:upload_with_active_record_extensions] # If the user chose the Active Record extensions # button, we'll use that and measure the time # it took. real_time_elapsed = Benchmark.realtime do columns = [:user_agent, :path_info, :remote_addr, :http_referrer, :status, :visited_at] values = [] LogParser.new.parse_io_stream(params[:log][:file]) do |l| values << [ l['HTTP_USER_AGENT'], l['PATH_INFO'], l['REMOTE_ADDR'], l['HTTP_REFERER'], l['STATUS'], Date.parse(l['DATETIME']) ] count = count + 1 end Hit.import columns, values, :validate=>false if values.length>0 end else # If the user chose the "Upload with Active Record" button, # then use regular Active Record to upload the records and # measure the time it takes. real_time_elapsed = Benchmark.realtime do LogParser.new.parse_io_stream(params[:log][:file]) do |l| Hit.create( :user_agent => l['HTTP_USER_AGENT'], :path_info => l['PATH_INFO'], :remote_addr => l['REMOTE_ADDR'], :http_referrer => l['HTTP_REFERER'], :status => l['STATUS'], :visited_at => l['DATETIME'] )

The data is encoded in fixed-length fields, all contained within the 128-byte block at the end of any MP3 file that has ID3 data. The first three bytes of this block are just TAG. If you get to the point in an MP3 file 128 bytes before the end of the file, and the next three bytes are not TAG, there is no ID3 tag. In the v1 standard, the fields are as follows:

By increasing the left value, we move the element to the right. By increasing the element s top value, we would be shifting the element further down the page: <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title>CSS Positioning Demo Page</title> <style type="text/css"> .abs { position:absolute; left:200px; top:150px } </style> </head> <body> <form id="form1"> <h2>First Heading is Normal</h2> <h2 class="abs">Second Heading is 'Absolute'</h2> </form> </body> </html> We should expect to see that the second line of text has been located at the x,y (top and left) coordinates that we have specified in our style, as shown in Figure 6-13.

count = count + 1 end end end flash[:notice] << " #{count} uploaded, #{Hit.count} total\n" flash[:notice] << " #{'%0.2f' % real_time_elapsed} elapsed, " << real_time_elapsed)*60 } records per minute ." "#{'%0.2f' % (count.to_f /

30 30 30 4 30 1

Absolute positioning is quite powerful and will be the positioning of choice for various dynamic tools that you ll use, such as hover tips, pop-up menus, and other content that you need to place at will on the user s page.

redirect_to :controller=>:home, :action=>:index end def clear_all Hit.delete_all flash[:notice] = 'Logs cleared!' redirect_to :controller=>:home, :action=>:index end end

The field lengths add up to 125 bytes, with the TAG from the beginning adding the last 3 bytes for a total of 128. If the data in any of these tags (except the Genre field) doesn t require the whole length, it is padded with char 0 (\000). Some tagging software pads the fields with strings, however. The Genre tag is a special field that contains a single byte that represents a genre. There are 255 possible genres, but there were only 79 defined originally although that has risen to 149 (and possibly more). There are a few problems with this system, not the least of which is that there is no way to extend it. The fields are fixed length, so if you want to add a new type of information (a track number, for example), you can t. However, v1.1 of the ID3 tag addresses this in a novel fashion. Because the Comment field is really too small to include much information, a small part of it is carved out to encode the track number for a given file. The change is pretty simple and it takes only the last byte out of the Comment field to encode the information. Table 22-2. ID3 v1.1 Fields

Save this as app/controllers/logs_controller.rb. Now, define a controller that creates your reports, as shown in Listing 10-3.

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