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# frozen_string_literal: true
# Copyright, 2018, by Samuel G. D. Williams. <http://www.codeotaku.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
require_relative 'wrapper'
require 'zlib'
module Protocol
module HTTP
module Body
class ZStream < Wrapper
DEFAULT_LEVEL = 7
DEFLATE = -Zlib::MAX_WBITS
GZIP = Zlib::MAX_WBITS | 16
ENCODINGS = {
'deflate' => DEFLATE,
'gzip' => GZIP,
}
def self.encoding_name(window_size)
if window_size <= -8
return 'deflate'
elsif window_size >= 16
return 'gzip'
else
return 'compress'
end
end
def initialize(body, stream)
super(body)
@stream = stream
@input_length = 0
@output_length = 0
end
def close(error = nil)
@stream.close unless @stream.closed?
super
end
def length
# We don't know the length of the output until after it's been compressed.
nil
end
attr :input_length
attr :output_length
def ratio
if @input_length != 0
@output_length.to_f / @input_length.to_f
else
1.0
end
end
def inspect
"#{super} | \#<#{self.class} #{(ratio*100).round(2)}%>"
end
end
class Deflate < ZStream
def self.for(body, window_size = GZIP, level = DEFAULT_LEVEL)
self.new(body, Zlib::Deflate.new(level, window_size))
end
def stream?
# We might want to revisit this design choice.
# We could wrap the streaming body in a Deflate stream, but that would require an extra stream wrapper which we don't have right now. See also `Digestable#stream?`.
false
end
def read
return if @stream.finished?
# The stream might have been closed while waiting for the chunk to come in.
if chunk = super
@input_length += chunk.bytesize
chunk = @stream.deflate(chunk, Zlib::SYNC_FLUSH)
@output_length += chunk.bytesize
return chunk
elsif !@stream.closed?
chunk = @stream.finish
@output_length += chunk.bytesize
return chunk.empty? ? nil : chunk
end
end
end
end
end
end
|
