Class: Innodb::Page::Blob

Inherits:
Innodb::Page show all
Defined in:
lib/innodb/page/blob.rb

Constant Summary

Constants inherited from Innodb::Page

PAGE_TYPE, PAGE_TYPE_BY_VALUE, SPECIALIZED_CLASSES

Instance Attribute Summary

Attributes inherited from Innodb::Page

#space

Instance Method Summary collapse

Methods inherited from Innodb::Page

#calculate_checksum, #checksum, #corrupt?, #cursor, #fil_header, handle, #initialize, #inspect, #lsn, maybe_undefined, #name, #next, #offset, parse, #pos_fil_header, #pos_fil_trailer, #pos_page_body, #prev, #size, #size_fil_header, #size_fil_trailer, #type

Constructor Details

This class inherits a constructor from Innodb::Page

Instance Method Details

#blob_data ⇒ Object 



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# File 'lib/innodb/page/blob.rb', line 25

def blob_data
  cursor(pos_blob_data).name("blob_data") do |c|
    c.get_bytes(blob_header[:length])
  end
end

#blob_header ⇒ Object 



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# File 'lib/innodb/page/blob.rb', line 16

def blob_header
  cursor(pos_blob_header).name("blob_header") do |c|
    {
      :length => c.name("length") { c.get_uint32 },
      :next   => c.name("next") { Innodb::Page.maybe_undefined(c.get_uint32) },
    }
  end
end

#dump ⇒ Object

Dump the contents of a page for debugging purposes.



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# File 'lib/innodb/page/blob.rb', line 71

def dump
  super

  puts "blob header:"
  pp blob_header
  puts

  puts "blob data:"
  dump_hex(blob_data)
  puts

  puts
end

#dump_hex(string) ⇒ Object 



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# File 'lib/innodb/page/blob.rb', line 31

def dump_hex(string)
  slice_size = 16
  bytes = string.split("").map { |s| s.ord }
  string.split("").each_slice(slice_size).each_with_index do |slice_bytes, slice_count|
    puts "%08i  %-23s  %-23s  |%-16s|" % [
      (slice_count * slice_size),
      slice_bytes[0..8].map { |n| "%02x" % n.ord }.join(" "),
      slice_bytes[8..16].map { |n| "%02x" % n.ord }.join(" "),
      slice_bytes.join(""),
    ]
  end
end

#each_region {|{ :offset => pos_blob_header, :length => size_blob_header, :name => :blob_header, :info => "Blob Header", }| ... } ⇒ Object

Yields:



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# File 'lib/innodb/page/blob.rb', line 44

def each_region
  unless block_given?
    return enum_for(:each_region)
  end

  super do |region|
    yield region
  end

  yield({
    :offset => pos_blob_header,
    :length => size_blob_header,
    :name => :blob_header,
    :info => "Blob Header",
  })

  yield({
    :offset => pos_blob_data,
    :length => blob_header[:length],
    :name => :blob_data,
    :info => "Blob Data",
  })

  nil
end

#pos_blob_data ⇒ Object 



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# File 'lib/innodb/page/blob.rb', line 12

def pos_blob_data
  pos_blob_header + size_blob_header
end

#pos_blob_header ⇒ Object 



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# File 'lib/innodb/page/blob.rb', line 4

def pos_blob_header
  pos_page_body
end

#size_blob_header ⇒ Object 



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# File 'lib/innodb/page/blob.rb', line 8

def size_blob_header
  4 + 4
end