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# frozen-string-literal: true
module Plum
module HPACK
module Context
attr_reader :dynamic_table, :limit, :size
def limit=(value)
@limit = value
evict
end
private
def initialize(dynamic_table_limit)
@limit = dynamic_table_limit
@dynamic_table = []
@size = 0
end
def store(name, value)
value = value.to_s
@dynamic_table.unshift([name.freeze, value.freeze])
@size += name.bytesize + value.bytesize + 32
evict
end
def fetch(index)
if index == 0
raise HPACKError.new("index can't be 0")
elsif index <= STATIC_TABLE_SIZE
STATIC_TABLE[index - 1]
elsif index <= STATIC_TABLE.size + @dynamic_table.size
@dynamic_table[index - STATIC_TABLE_SIZE - 1]
else
raise HPACKError.new("invalid index: #{index}")
end
end
def search(name, value)
si = STATIC_TABLE.index { |n, v| n == name && v == value }
return si + 1 if si
di = @dynamic_table.index { |n, v| n == name && v == value }
return di + STATIC_TABLE_SIZE + 1 if di
end
def search_half(name)
si = STATIC_TABLE.index { |n, v| n == name }
return si + 1 if si
di = @dynamic_table.index { |n, v| n == name }
return di + STATIC_TABLE_SIZE + 1 if di
end
def evict
while @size > @limit
name, value = @dynamic_table.pop
@size -= name.bytesize + value.bytesize + 32
end
end
end
end
end
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