Class: Ip2region::XdbSearcher

Inherits:
Object
  • Object
show all
Includes:
Singleton
Defined in:
lib/ip2region/xdb_searcher.rb

Constant Summary collapse

HeaderInfoLength =

xdb默认参数

256
VectorIndexRows = 
256
VectorIndexCols = 
256
VectorIndexSize = 
8
SegmentIndexSize = 
14

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ XdbSearcher 



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# File 'lib/ip2region/xdb_searcher.rb', line 26

def initialize()
  init_database(@@xdb_path, nil, nil)
end

Instance Attribute Details

#content_buff ⇒ Object

Returns the value of attribute content_buff.



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# File 'lib/ip2region/xdb_searcher.rb', line 16

def content_buff
  @content_buff
end

#f ⇒ Object

Returns the value of attribute f.



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# File 'lib/ip2region/xdb_searcher.rb', line 16

def f
  @f
end

#vector_index ⇒ Object

Returns the value of attribute vector_index.



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# File 'lib/ip2region/xdb_searcher.rb', line 16

def vector_index
  @vector_index
end

Class Method Details

.xdb_path ⇒ Object 



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# File 'lib/ip2region/xdb_searcher.rb', line 22

def self.xdb_path
  @@xdb_path
end

.xdb_path=(path) ⇒ Object 



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# File 'lib/ip2region/xdb_searcher.rb', line 18

def self.xdb_path= (path)
  @@xdb_path = path
end

Instance Method Details

#get_int2(b, offset) ⇒ Object 



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# File 'lib/ip2region/xdb_searcher.rb', line 66

def get_int2(b, offset)
  (b[offset].ord & 0x000000FF) | (b[offset + 1].ord & 0x0000FF00)
end

#get_long(b, offset) ⇒ Object 



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# File 'lib/ip2region/xdb_searcher.rb', line 60

def get_long(b, offset)
  return 0 if b[offset, 4].length != 4

  b[offset, 4].unpack("I")[0]
end

#init_database(dbfile, vi, cb) ⇒ Object 



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# File 'lib/ip2region/xdb_searcher.rb', line 30

def init_database(dbfile, vi, cb)
  begin
    if cb
      @f = nil
      @vector_index = nil
      @content_buff= cb
    else
      @f = File.open(dbfile, "rb")
      @vector_index = vi
    end
  rescue IOError => e
    puts "[Error]: #{e}"
    exit
  end
end

#ip_to_long(ip) ⇒ Object 



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# File 'lib/ip2region/xdb_searcher.rb', line 56

def ip_to_long(ip)
  IPAddr.new(ip).to_i
end

#read_buffer(offset, length) ⇒ Object 



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# File 'lib/ip2region/xdb_searcher.rb', line 70

def read_buffer(offset, length)
  buffer = nil
  if self.content_buff != nil
    buffer = self.content_buff[offset, length]
  else
    f.seek(offset)
    buffer = f.read(length)
  end
end

#search(ip) ⇒ Object 



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# File 'lib/ip2region/xdb_searcher.rb', line 46

def search(ip)
  if ip.is_a?(String)

    ip = ip_to_long(ip).to_i unless ip =~ /\A\d+\z/
    return search_by_ip_long(ip)
  else
    return search_by_ip_long(ip)
  end
end

#search_by_ip_long(ip) ⇒ Object 



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# File 'lib/ip2region/xdb_searcher.rb', line 80

def search_by_ip_long(ip)
  #locate the segment index block based on the vector index
  s_ptr = e_ptr = 0
  il0 = (ip >> 24) & 0xFF
  il1 = (ip >> 16) & 0xFF
  idx = il0 * VectorIndexCols * VectorIndexSize + il1 * VectorIndexSize


  if self.vector_index != nil
    s_ptr = self.get_long(self.vector_index, idx)
    e_ptr = self.get_long(self.vector_index, idx + 4)
  elsif self.content_buff != nil
    s_ptr = self.get_long(self.content_buff,HeaderInfoLength +  idx)
    e_ptr = self.get_long(self.content_buff, HeaderInfoLength + idx + 4)
  else
    f.seek(HeaderInfoLength + idx)
    buffer_ptr = f.read(8)
    s_ptr = self.get_long(buffer_ptr, 0)
    e_ptr = self.get_long(buffer_ptr, 4)
  end

  data_len = data_ptr = -1

  l = 0
  h = (e_ptr - s_ptr) / SegmentIndexSize

  while l <= h
    m = (l + h) >> 1
    p = s_ptr + m * SegmentIndexSize

    # read the segment index
    buffer_sip = self.read_buffer(p, SegmentIndexSize)
    sip = self.get_long(buffer_sip, 0)
    if ip < sip
      h = m-1
    else
      eip = self.get_long(buffer_sip, 4)
      if ip > eip
        l = m + 1
      else
        data_len = self.get_int2(buffer_sip, 8)
        data_ptr = self.get_long(buffer_sip, 10)
        break
      end
    end
  end

  if data_ptr == -1
    return nil
  end

  buffer_string = self.read_buffer(data_ptr, data_len)
  # to utf8
  buffer_string.force_encoding("UTF-8")

end