Class: RubyAMF::IO::AMFSerializer

Inherits:
Object
  • Object
show all
Includes:
Configuration, BinaryWriter, Constants, VoHelper
Defined in:
lib/revent/amf3/io/amf_serializer.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ AMFSerializer

Returns a new instance of AMFSerializer.



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# File 'lib/revent/amf3/io/amf_serializer.rb', line 15

def initialize
  reset
end

Instance Attribute Details

#stream ⇒ Object

Returns the value of attribute stream.



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# File 'lib/revent/amf3/io/amf_serializer.rb', line 13

def stream
  @stream
end

Instance Method Details

#reset ⇒ Object 



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# File 'lib/revent/amf3/io/amf_serializer.rb', line 19

def reset
  @stream = ''
  reset_referencables
end

#reset_referencables ⇒ Object 



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# File 'lib/revent/amf3/io/amf_serializer.rb', line 24

def reset_referencables
  @stored_strings = {} # hash is way faster than array
  @stored_strings[""] = true # add this in automatically
  @floats_cache = {} # for write_double at read_write.rb
  @write_amf3_integer_results = {} # cache the integers
  @current_strings_index = 0
end

#write_amf3(value) ⇒ Object 



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# File 'lib/revent/amf3/io/amf_serializer.rb', line 32

def write_amf3(value)
  if !value
    @stream << "\001" # represents an amf3 null

  elsif (value.is_a?(TrueClass) || value.is_a?(FalseClass))
    value ? (@stream << "\003")  : (@stream << "\002")   # represents an amf3 true  and  false

  elsif value.is_a?(Numeric)
    if value.is_a?(Integer) # Aryk: This was also incorrect before because you has Bignum check AFTER the Integer check, which means the Bignum's were getting picked up by Integers
      if value.is_a?(Bignum)
        @stream << "\005" # represents an amf3 complex number
        write_double(value)
      else
        write_amf3_number(value)
      end
    elsif value.is_a?(Float)
      @stream << "\005" # represents an amf3 complex number
      write_double(value)
    elsif value.is_a?(BigDecimal) # Aryk: BigDecimal does not relate to Float, so keep it as a seperate check.
      # TODO: Aryk: Not quite sure why you do value.to_s.to_f? can't you just do value.to_f?
      value = value.to_s('F').to_f #this is turning a string into a Ruby Float, but because there are no further operations on it it is safe          
      @stream << "\005" # represents an amf3 complex number
      write_double(value)
    end

  elsif value.is_a?(String)
    @stream << "\006" # represents an amf3 string
    write_amf3_string(value)

  elsif value.is_a?(Array)
    write_amf3_array(value)

  elsif value.is_a?(ByteArray)
    write_amf3_byte_array(value)

  elsif value.is_a?(Hash)
    write_amf3_object(value)

  elsif value.is_a?(Time) || value.is_a?(Date)
    @stream << "\b" # represents an amf3 date
    write_amf3_date(value)

    # I know we can combine this with the last condition, but don't  ; the Rexml and Beautiful Soup test is expensive, and for large record sets with many AR its better to be able to skip the next step
  elsif value.is_a?(ActiveRecord::Base) # Aryk: this way, we can bypass the "['REXML::Document', 'BeautifulSoup'].include?(value.class.to_s) " operation
    write_amf3_object(VoUtil.get_vo_hash_for_outgoing(value))

  elsif ['REXML::Document', 'BeautifulSoup'].include?(value.class.to_s) 
    write_byte(AMF3_XML)
    write_amf3_xml(value)

  elsif value.is_a?(Object)
    write_amf3_object(VoUtil.get_vo_hash_for_outgoing(value) )
  end
end

#write_amf3_array(array) ⇒ Object 



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# File 'lib/revent/amf3/io/amf_serializer.rb', line 152

def write_amf3_array(array)
  num_objects = array.length * 2 + 1
  if ClassMappings.use_array_collection
    @stream << "\n\a" # AMF3_OBJECT and AMF3_XML
    write_amf3_string("flex.messaging.io.ArrayCollection")
  end
  @stream << "\t" # represents an amf3 array
  write_amf3_integer(num_objects)
  @stream << "\001" # represents an amf3 empty string #write empty for string keyed elements here, as it's never allowed from ruby
  array.each{|v| write_amf3(v) }
end

#write_amf3_byte_array(byte_array) ⇒ Object 



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# File 'lib/revent/amf3/io/amf_serializer.rb', line 177

def write_amf3_byte_array(byte_array)
  write_word8(AMF3_BYTE_ARRAY)
  bytes = byte_array.bytes
  length = bytes.length << 1
  length = length | 0x1
  write_amf3_integer(length)
  @stream << bytes
end

#write_amf3_date(datetime) ⇒ Object

Aryk: Dates will almost never be the same, so turn off the storing_objects



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# File 'lib/revent/amf3/io/amf_serializer.rb', line 164

def write_amf3_date(datetime) # Aryk: Dates will almost never be the same, so turn off the storing_objects
  write_amf3_integer(1)
  seconds = if datetime.is_a?(Time)
    datetime.utc unless datetime.utc?
    datetime.to_f
  elsif datetime.is_a?(Date) # this also handles the case for DateTime
    datetime.strftime("%s").to_i
    # datetime = Time.gm( datetime.year, datetime.month, datetime.day )
    # datetime = Time.gm( datetime.year, datetime.month, datetime.day, datetime.hour, datetime.min, datetime.sec )      
  end
  write_double((seconds*1000).to_i) # used to be total_milliseconds = datetime.to_i * 1000 + ( datetime.usec/1000 )
end

#write_amf3_integer(int) ⇒ Object 



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# File 'lib/revent/amf3/io/amf_serializer.rb', line 87

def write_amf3_integer(int)
  @stream << (@write_amf3_integer_results[int] ||= (
      int = int & 0x1fffffff
      if int < 0x80
        [int].pack('c')
      elsif int < 0x4000
        [int >> 7 & 0x7f | 0x80].pack('c') +
          [int & 0x7f].pack('c')
      elsif int < 0x200000
        [int >> 14 & 0x7f | 0x80].pack('c') +
          [int >> 7 & 0x7f | 0x80].pack('c') +
          [int & 0x7f].pack('c')
      else
        [int >> 22 & 0x7f | 0x80].pack('c') +
          [int >> 15 & 0x7f | 0x80].pack('c') +
          [int >> 8 & 0x7f | 0x80].pack('c') +
          [int & 0xff].pack('c')
      end
    ))
end

#write_amf3_number(number) ⇒ Object 



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# File 'lib/revent/amf3/io/amf_serializer.rb', line 108

def write_amf3_number(number)
  if(number >= AMF3_INTEGER_MIN && number <= AMF3_INTEGER_MAX) #check valid range for 29bits
    @stream << "\004" # represents an amf3 integer
    write_amf3_integer(number)
  else #overflow condition otherwise
    @stream << "\005" # represents an amf3 complex number
    write_double(number)
  end
end

#write_amf3_object(hash) ⇒ Object 



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# File 'lib/revent/amf3/io/amf_serializer.rb', line 137

def write_amf3_object(hash)   
  not_vo_hash = !hash.is_a?(VoHash) # is this not a vohash - then doesnt have an _explicitType parameter
  @stream << "\n\v" # represents an amf3 object and dynamic object  
  not_vo_hash || !hash._explicitType ? (@stream << "\001") : write_amf3_string(hash._explicitType)
  hash.each do |attr, value| # Aryk: no need to remove any "_explicitType" or "rmember" key since they werent added as keys
    if not_vo_hash # then that means that the attr might not be symbols and it hasn't gone through camelizing if thats needed
      attr = attr.to_s.dup # need this just in case its frozen
      attr.to_camel! if ClassMappings.translate_case 
    end
    write_amf3_string(attr) 
    value ? write_amf3(value) : (@stream << "\001") # represents an amf3 null
  end        
  @stream << "\001" # represents an amf3 empty string #close open object
end

#write_amf3_string(string) ⇒ Object 



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# File 'lib/revent/amf3/io/amf_serializer.rb', line 118

def write_amf3_string(string)
  if index = @stored_strings[string]
    if string == "" # store this initially so it gets caught by the stored_strings check
      @stream << "\001" # represents an amf3 empty string
    else
      reference = index << 1
      write_amf3_integer(reference)
    end
  else
    @stored_strings[string] = @current_strings_index
    @current_strings_index += 1 # increment the index
    reference = string.length
    reference = reference << 1
    reference = reference | 1
    write_amf3_integer(reference)
    writen(string)
  end
end

#write_amf3_xml(value) ⇒ Object 



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# File 'lib/revent/amf3/io/amf_serializer.rb', line 186

def write_amf3_xml(value)
  xml = value.to_s
  a = xml.strip
  if(a != nil)
    b = a.gsub!(/\>(\n|\r|\r\n| |\t)*\</,'><') #clean whitespace
  else
    b = xml.gsub!(/\>(\n|\r|\r\n| |\t)*\</,'><') #clean whitespace
  end
  write_amf3_string(b)
end