Class: HTTP2::Header::Decompressor
- Inherits:
-
Object
- Object
- HTTP2::Header::Decompressor
- Defined in:
- lib/http/2/compressor.rb
Overview
Responsible for decoding received headers and maintaining compression context of the opposing peer. Decompressor must be initialized with appropriate starting context based on local role: client or server.
Instance Method Summary collapse
-
#decode(buf) ⇒ Array
Decodes and processes header commands within provided buffer.
-
#header(buf) ⇒ Hash
Decodes header command from provided buffer.
-
#initialize(**options) ⇒ Decompressor
constructor
A new instance of Decompressor.
-
#integer(buf, n) ⇒ Integer
Decodes integer value from provided buffer.
-
#string(buf) ⇒ String
Decodes string value from provided buffer.
-
#table_size=(size) ⇒ Object
Set dynamic table size in EncodingContext.
Constructor Details
#initialize(**options) ⇒ Decompressor
Returns a new instance of Decompressor.
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# File 'lib/http/2/compressor.rb', line 472 def initialize(**) @cc = EncodingContext.new(**) end |
Instance Method Details
#decode(buf) ⇒ Array
Decodes and processes header commands within provided buffer.
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# File 'lib/http/2/compressor.rb', line 555 def decode(buf) list = [] decoding_pseudo_headers = true until buf.empty? next_header = @cc.process(header(buf)) next if next_header.nil? is_pseudo_header = next_header.first.start_with? ':' if !decoding_pseudo_headers && is_pseudo_header fail ProtocolError, 'one or more pseudo headers encountered after regular headers' end decoding_pseudo_headers = is_pseudo_header list << next_header end list end |
#header(buf) ⇒ Hash
Decodes header command from provided buffer.
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# File 'lib/http/2/compressor.rb', line 520 def header(buf) peek = buf.readbyte(0) header = {} header[:type], type = HEADREP.find do |_t, desc| mask = (peek >> desc[:prefix]) << desc[:prefix] mask == desc[:pattern] end fail CompressionError unless header[:type] header[:name] = integer(buf, type[:prefix]) case header[:type] when :indexed fail CompressionError if (header[:name]).zero? header[:name] -= 1 when :changetablesize header[:value] = header[:name] else if (header[:name]).zero? header[:name] = string(buf) else header[:name] -= 1 end header[:value] = string(buf) end header end |
#integer(buf, n) ⇒ Integer
Decodes integer value from provided buffer.
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# File 'lib/http/2/compressor.rb', line 487 def integer(buf, n) limit = 2**n - 1 i = !n.zero? ? (buf.getbyte & limit) : 0 m = 0 while (byte = buf.getbyte) i += ((byte & 127) << m) m += 7 break if (byte & 128).zero? end if (i == limit) i end |
#string(buf) ⇒ String
Decodes string value from provided buffer.
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# File 'lib/http/2/compressor.rb', line 507 def string(buf) huffman = (buf.readbyte(0) & 0x80) == 0x80 len = integer(buf, 7) str = buf.read(len) fail CompressionError, 'string too short' unless str.bytesize == len str = Huffman.new.decode(Buffer.new(str)) if huffman str.force_encoding(Encoding::UTF_8) end |
#table_size=(size) ⇒ Object
Set dynamic table size in EncodingContext
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# File 'lib/http/2/compressor.rb', line 478 def table_size=(size) @cc.table_size = size end |