Class: Baykit::BayServer::Docker::Http::H2::HeaderBlock

Inherits:
Object
  • Object
show all
Defined in:
lib/baykit/bayserver/docker/http/h2/header_block.rb

Constant Summary collapse

INDEX = 
1
OVERLOAD_KNOWN_HEADER = 
2
NEW_HEADER = 
3
KNOWN_HEADER = 
4
UNKNOWN_HEADER = 
5
UPDATE_DYNAMIC_TABLE_SIZE = 
6

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#index ⇒ Object

Returns the value of attribute index.



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# File 'lib/baykit/bayserver/docker/http/h2/header_block.rb', line 16

def index
  @index
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/baykit/bayserver/docker/http/h2/header_block.rb', line 17

def name
  @name
end

#op ⇒ Object

Returns the value of attribute op.



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# File 'lib/baykit/bayserver/docker/http/h2/header_block.rb', line 15

def op
  @op
end

#size ⇒ Object

Returns the value of attribute size.



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# File 'lib/baykit/bayserver/docker/http/h2/header_block.rb', line 19

def size
  @size
end

#value ⇒ Object

Returns the value of attribute value.



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# File 'lib/baykit/bayserver/docker/http/h2/header_block.rb', line 18

def value
  @value
end

Class Method Details

.pack(blk, acc) ⇒ Object 



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# File 'lib/baykit/bayserver/docker/http/h2/header_block.rb', line 21

def self.pack(blk, acc)
  case blk.op
  when INDEX
    acc.put_hpack_int(blk.index, 7, 1)

  when OVERLOAD_KNOWN_HEADER
    raise RuntimeError.new("IllegalState")

  when NEW_HEADER
    raise RuntimeError.new("Illegal State")

  when KNOWN_HEADER
    acc.put_hpack_int(blk.index, 4, 0)
    acc.put_hpack_string(blk.value, false)

  when UNKNOWN_HEADER
    acc.put_byte(0)
    acc.put_hpack_string(blk.name, false)
    acc.put_hpack_string(blk.value, false)

  when UPDATE_DYNAMIC_TABLE_SIZE
    raise RuntimeError.new("Illegal state")
  end
end

.unpack(acc) ⇒ Object 



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# File 'lib/baykit/bayserver/docker/http/h2/header_block.rb', line 47

def self.unpack(acc)
  blk = HeaderBlock.new
  index = acc.get_byte
  is_index_header_field = (index & 0x80) != 0
  if is_index_header_field
    # index header field
    #   0   1   2   3   4   5   6   7
    # +---+---+---+---+---+---+---+---+
    # | 1 |        Index (7+)         |
    # +---+---------------------------+
    blk.op = INDEX
    blk.index = index & 0x7F
  else
    # literal header field
    update_index = (index & 0x40) != 0
    if update_index
      index = index & 0x3F
      overload_index = (index != 0)
      if overload_index
        if index == 0x3F
          index = index + acc.get_hpack_int_rest
        end
        blk.op = OVERLOAD_KNOWN_HEADER
        blk.index = index
        #   0   1   2   3   4   5   6   7
        # +---+---+---+---+---+---+---+---+
        # | 0 | 1 |      Index (6+)       |
        # +---+---+-----------------------+
        # | H |     Value Length (7+)     |
        # +---+---------------------------+
        # | Value String (Length octets)  |
        # +-------------------------------+
        blk.value = acc.get_hpack_string
      else
        # new header name
        #   0   1   2   3   4   5   6   7
        # +---+---+---+---+---+---+---+---+
        # | 0 | 1 |           0           |
        # +---+---+-----------------------+
        # | H |     Name Length (7+)      |
        # +---+---------------------------+
        # |  Name String (Length octets)  |
        # +---+---------------------------+
        # | H |     Value Length (7+)     |
        # +---+---------------------------+
        # | Value String (Length octets)  |
        # +-------------------------------+
        blk.op = NEW_HEADER
        blk.name = acc.get_hpack_string
        blk.value = acc.get_hpack_string
      end
    else
      update_dynamic_table_size = (index & 0x20) != 0
      if update_dynamic_table_size
        #   0   1   2   3   4   5   6   7
        # +---+---+---+---+---+---+---+---+
        # | 0 | 0 | 1 |   Max size (5+)   |
        # +---+---------------------------+
        size = index & 0x1F
        if size == 0x1F
          size = size + acc.get_hpack_int_rest
        end
        blk.op = UPDATE_DYNAMIC_TABLE_SIZE
        blk.size = size
      else
        # not update index
        index = (index & 0xF)
        if index != 0
          #   0   1   2   3   4   5   6   7
          # +---+---+---+---+---+---+---+---+
          # | 0 | 0 | 0 | 0 |  Index (4+)   |
          # +---+---+-----------------------+
          # | H |     Value Length (7+)     |
          # +---+---------------------------+
          # | Value String (Length octets)  |
          # +-------------------------------+
          #
          # OR
          #
          #   0   1   2   3   4   5   6   7
          # +---+---+---+---+---+---+---+---+
          # | 0 | 0 | 0 | 1 |  Index (4+)   |
          # +---+---+-----------------------+
          # | H |     Value Length (7+)     |
          # +---+---------------------------+
          # | Value String (Length octets)  |
          # +-------------------------------+
          if index == 0xF
            index = index + acc.get_hpack_int_rest
          end
          blk.op = KNOWN_HEADER
          blk.index = index
          blk.value = acc.get_hpack_string
        else
          # literal header field
          #   0   1   2   3   4   5   6   7
          # +---+---+---+---+---+---+---+---+
          # | 0 | 0 | 0 | 0 |       0       |
          # +---+---+-----------------------+
          # | H |     Name Length (7+)      |
          # +---+---------------------------+
          # |  Name String (Length octets)  |
          # +---+---------------------------+
          # | H |     Value Length (7+)     |
          # +---+---------------------------+
          # | Value String (Length octets)  |
          # +-------------------------------+
          #
          # OR
          #
          #   0   1   2   3   4   5   6   7
          # +---+---+---+---+---+---+---+---+
          # | 0 | 0 | 0 | 1 |       0       |
          # +---+---+-----------------------+
          # | H |     Name Length (7+)      |
          # +---+---------------------------+
          # |  Name String (Length octets)  |
          # +---+---------------------------+
          # | H |     Value Length (7+)     |
          # +---+---------------------------+
          # | Value String (Length octets)  |
          # +-------------------------------+
          #
          blk.op = UNKNOWN_HEADER
          blk.name = acc.get_hpack_string
          blk.value = acc.get_hpack_string
        end
      end
    end
  end

  blk
end

Instance Method Details

#to_s ⇒ Object 



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# File 'lib/baykit/bayserver/docker/http/h2/header_block.rb', line 181

def to_s
  "#{op} index=#{index} name=#{name} value=#{value}"
end