Adding upstream version 115.7.0esr.upstream/115.7.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1428 insertions, 0 deletions

diff --git a/testing/xpcshell/node-http2/lib/protocol/compressor.js b/testing/xpcshell/node-http2/lib/protocol/compressor.js
new file mode 100644
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+++ b/testing/xpcshell/node-http2/lib/protocol/compressor.js
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+// The implementation of the [HTTP/2 Header Compression][http2-compression] spec is separated from
+// the 'integration' part which handles HEADERS and PUSH_PROMISE frames. The compression itself is
+// implemented in the first part of the file, and consists of three classes: `HeaderTable`,
+// `HeaderSetDecompressor` and `HeaderSetCompressor`. The two latter classes are
+// [Transform Stream][node-transform] subclasses that operate in [object mode][node-objectmode].
+// These transform chunks of binary data into `[name, value]` pairs and vice versa, and store their
+// state in `HeaderTable` instances.
+//
+// The 'integration' part is also implemented by two [Transform Stream][node-transform] subclasses
+// that operate in [object mode][node-objectmode]: the `Compressor` and the `Decompressor`. These
+// provide a layer between the [framer](framer.html) and the
+// [connection handling component](connection.html).
+//
+// [node-transform]: https://nodejs.org/api/stream.html#stream_class_stream_transform
+// [node-objectmode]: https://nodejs.org/api/stream.html#stream_new_stream_readable_options
+// [http2-compression]: https://tools.ietf.org/html/rfc7541
+
+exports.HeaderTable = HeaderTable;
+exports.HuffmanTable = HuffmanTable;
+exports.HeaderSetCompressor = HeaderSetCompressor;
+exports.HeaderSetDecompressor = HeaderSetDecompressor;
+exports.Compressor = Compressor;
+exports.Decompressor = Decompressor;
+
+var TransformStream = require('stream').Transform;
+var assert = require('assert');
+var util = require('util');
+
+// Header compression
+// ==================
+
+// The HeaderTable class
+// ---------------------
+
+// The [Header Table] is a component used to associate headers to index values. It is basically an
+// ordered list of `[name, value]` pairs, so it's implemented as a subclass of `Array`.
+// In this implementation, the Header Table and the [Static Table] are handled as a single table.
+// [Header Table]: https://tools.ietf.org/html/rfc7541#section-2.3.2
+// [Static Table]: https://tools.ietf.org/html/rfc7541#section-2.3.1
+function HeaderTable(log, limit) {
+  var self = HeaderTable.staticTable.map(entryFromPair);
+  self._log = log;
+  self._limit = limit || DEFAULT_HEADER_TABLE_LIMIT;
+  self._staticLength = self.length;
+  self._size = 0;
+  self._enforceLimit = HeaderTable.prototype._enforceLimit;
+  self.add = HeaderTable.prototype.add;
+  self.setSizeLimit = HeaderTable.prototype.setSizeLimit;
+  return self;
+}
+
+function entryFromPair(pair) {
+  var entry = pair.slice();
+  entry._size = size(entry);
+  return entry;
+}
+
+// The encoder decides how to update the header table and as such can control how much memory is
+// used by the header table.  To limit the memory requirements on the decoder side, the header table
+// size is bounded.
+//
+// * The default header table size limit is 4096 bytes.
+// * The size of an entry is defined as follows: the size of an entry is the sum of its name's
+//   length in bytes, of its value's length in bytes and of 32 bytes.
+// * The size of a header table is the sum of the size of its entries.
+var DEFAULT_HEADER_TABLE_LIMIT = 4096;
+
+function size(entry) {
+  return (Buffer.from(entry[0] + entry[1], 'utf8')).length + 32;
+}
+
+// The `add(index, entry)` can be used to [manage the header table][tablemgmt]:
+// [tablemgmt]: https://tools.ietf.org/html/rfc7541#section-4
+//
+// * it pushes the new `entry` at the beggining of the table
+// * before doing such a modification, it has to be ensured that the header table size will stay
+//   lower than or equal to the header table size limit. To achieve this, entries are evicted from
+//   the end of the header table until the size of the header table is less than or equal to
+//   `(this._limit - entry.size)`, or until the table is empty.
+//
+//              <----------  Index Address Space ---------->
+//              <-- Static  Table -->  <-- Header  Table -->
+//              +---+-----------+---+  +---+-----------+---+
+//              | 0 |    ...    | k |  |k+1|    ...    | n |
+//              +---+-----------+---+  +---+-----------+---+
+//                                     ^                   |
+//                                     |                   V
+//                              Insertion Point       Drop Point
+
+HeaderTable.prototype._enforceLimit = function _enforceLimit(limit) {
+  var droppedEntries = [];
+  while ((this._size > 0) && (this._size > limit)) {
+    var dropped = this.pop();
+    this._size -= dropped._size;
+    droppedEntries.unshift(dropped);
+  }
+  return droppedEntries;
+};
+
+HeaderTable.prototype.add = function(entry) {
+  var limit = this._limit - entry._size;
+  var droppedEntries = this._enforceLimit(limit);
+
+  if (this._size <= limit) {
+    this.splice(this._staticLength, 0, entry);
+    this._size += entry._size;
+  }
+
+  return droppedEntries;
+};
+
+// The table size limit can be changed externally. In this case, the same eviction algorithm is used
+HeaderTable.prototype.setSizeLimit = function setSizeLimit(limit) {
+  this._limit = limit;
+  this._enforceLimit(this._limit);
+};
+
+// [The Static Table](https://tools.ietf.org/html/rfc7541#section-2.3.1)
+// ------------------
+
+// The table is generated with feeding the table from the spec to the following sed command:
+//
+//     sed -re "s/\s*\| [0-9]+\s*\| ([^ ]*)/  [ '\1'/g" -e "s/\|\s([^ ]*)/, '\1'/g" -e 's/ \|/],/g'
+
+HeaderTable.staticTable  = [
+  [ ':authority'                  , ''            ],
+  [ ':method'                     , 'GET'         ],
+  [ ':method'                     , 'POST'        ],
+  [ ':path'                       , '/'           ],
+  [ ':path'                       , '/index.html' ],
+  [ ':scheme'                     , 'http'        ],
+  [ ':scheme'                     , 'https'       ],
+  [ ':status'                     , '200'         ],
+  [ ':status'                     , '204'         ],
+  [ ':status'                     , '206'         ],
+  [ ':status'                     , '304'         ],
+  [ ':status'                     , '400'         ],
+  [ ':status'                     , '404'         ],
+  [ ':status'                     , '500'         ],
+  [ 'accept-charset'              , ''            ],
+  [ 'accept-encoding'             , 'gzip, deflate'],
+  [ 'accept-language'             , ''            ],
+  [ 'accept-ranges'               , ''            ],
+  [ 'accept'                      , ''            ],
+  [ 'access-control-allow-origin' , ''            ],
+  [ 'age'                         , ''            ],
+  [ 'allow'                       , ''            ],
+  [ 'authorization'               , ''            ],
+  [ 'cache-control'               , ''            ],
+  [ 'content-disposition'         , ''            ],
+  [ 'content-encoding'            , ''            ],
+  [ 'content-language'            , ''            ],
+  [ 'content-length'              , ''            ],
+  [ 'content-location'            , ''            ],
+  [ 'content-range'               , ''            ],
+  [ 'content-type'                , ''            ],
+  [ 'cookie'                      , ''            ],
+  [ 'date'                        , ''            ],
+  [ 'etag'                        , ''            ],
+  [ 'expect'                      , ''            ],
+  [ 'expires'                     , ''            ],
+  [ 'from'                        , ''            ],
+  [ 'host'                        , ''            ],
+  [ 'if-match'                    , ''            ],
+  [ 'if-modified-since'           , ''            ],
+  [ 'if-none-match'               , ''            ],
+  [ 'if-range'                    , ''            ],
+  [ 'if-unmodified-since'         , ''            ],
+  [ 'last-modified'               , ''            ],
+  [ 'link'                        , ''            ],
+  [ 'location'                    , ''            ],
+  [ 'max-forwards'                , ''            ],
+  [ 'proxy-authenticate'          , ''            ],
+  [ 'proxy-authorization'         , ''            ],
+  [ 'range'                       , ''            ],
+  [ 'referer'                     , ''            ],
+  [ 'refresh'                     , ''            ],
+  [ 'retry-after'                 , ''            ],
+  [ 'server'                      , ''            ],
+  [ 'set-cookie'                  , ''            ],
+  [ 'strict-transport-security'   , ''            ],
+  [ 'transfer-encoding'           , ''            ],
+  [ 'user-agent'                  , ''            ],
+  [ 'vary'                        , ''            ],
+  [ 'via'                         , ''            ],
+  [ 'www-authenticate'            , ''            ]
+];
+
+// The HeaderSetDecompressor class
+// -------------------------------
+
+// A `HeaderSetDecompressor` instance is a transform stream that can be used to *decompress a
+// single header set*. Its input is a stream of binary data chunks and its output is a stream of
+// `[name, value]` pairs.
+//
+// Currently, it is not a proper streaming decompressor implementation, since it buffer its input
+// until the end os the stream, and then processes the whole header block at once.
+
+util.inherits(HeaderSetDecompressor, TransformStream);
+function HeaderSetDecompressor(log, table) {
+  TransformStream.call(this, { objectMode: true });
+
+  this._log = log.child({ component: 'compressor' });
+  this._table = table;
+  this._chunks = [];
+}
+
+// `_transform` is the implementation of the [corresponding virtual function][_transform] of the
+// TransformStream class. It collects the data chunks for later processing.
+// [_transform]: https://nodejs.org/api/stream.html#stream_transform_transform_chunk_encoding_callback
+HeaderSetDecompressor.prototype._transform = function _transform(chunk, encoding, callback) {
+  this._chunks.push(chunk);
+  callback();
+};
+
+// `execute(rep)` executes the given [header representation][representation].
+// [representation]: https://tools.ietf.org/html/rfc7541#section-6
+
+// The *JavaScript object representation* of a header representation:
+//
+//     {
+//       name: String || Integer,  // string literal or index
+//       value: String || Integer, // string literal or index
+//       index: Boolean            // with or without indexing
+//     }
+//
+// *Important:* to ease the indexing of the header table, indexes start at 0 instead of 1.
+//
+// Examples:
+//
+//     Indexed:
+//     { name: 2  , value: 2  , index: false }
+//     Literal:
+//     { name: 2  , value: 'X', index: false } // without indexing
+//     { name: 2  , value: 'Y', index: true  } // with indexing
+//     { name: 'A', value: 'Z', index: true  } // with indexing, literal name
+HeaderSetDecompressor.prototype._execute = function _execute(rep) {
+  this._log.trace({ key: rep.name, value: rep.value, index: rep.index },
+                  'Executing header representation');
+
+  var entry, pair;
+
+  if (rep.contextUpdate) {
+    this._table.setSizeLimit(rep.newMaxSize);
+  }
+
+  // * An _indexed representation_ entails the following actions:
+  //   * The header field corresponding to the referenced entry is emitted
+  else if (typeof rep.value === 'number') {
+    var index = rep.value;
+    entry = this._table[index];
+
+    pair = entry.slice();
+    this.push(pair);
+  }
+
+  // * A _literal representation_ that is _not added_ to the header table entails the following
+  //   action:
+  //   * The header is emitted.
+  // * A _literal representation_ that is _added_ to the header table entails the following further
+  //   actions:
+  //   * The header is added to the header table.
+  //   * The header is emitted.
+  else {
+    if (typeof rep.name === 'number') {
+      pair = [this._table[rep.name][0], rep.value];
+    } else {
+      pair = [rep.name, rep.value];
+    }
+
+    if (rep.index) {
+      entry = entryFromPair(pair);
+      this._table.add(entry);
+    }
+
+    this.push(pair);
+  }
+};
+
+// `_flush` is the implementation of the [corresponding virtual function][_flush] of the
+// TransformStream class. The whole decompressing process is done in `_flush`. It gets called when
+// the input stream is over.
+// [_flush]: https://nodejs.org/api/stream.html#stream_transform_flush_callback
+HeaderSetDecompressor.prototype._flush = function _flush(callback) {
+  var buffer = concat(this._chunks);
+
+  // * processes the header representations
+  buffer.cursor = 0;
+  while (buffer.cursor < buffer.length) {
+    this._execute(HeaderSetDecompressor.header(buffer));
+  }
+
+  callback();
+};
+
+// The HeaderSetCompressor class
+// -----------------------------
+
+// A `HeaderSetCompressor` instance is a transform stream that can be used to *compress a single
+// header set*. Its input is a stream of `[name, value]` pairs and its output is a stream of
+// binary data chunks.
+//
+// It is a real streaming compressor, since it does not wait until the header set is complete.
+//
+// The compression algorithm is (intentionally) not specified by the spec. Therefore, the current
+// compression algorithm can probably be improved in the future.
+
+util.inherits(HeaderSetCompressor, TransformStream);
+function HeaderSetCompressor(log, table) {
+  TransformStream.call(this, { objectMode: true });
+
+  this._log = log.child({ component: 'compressor' });
+  this._table = table;
+  this.push = TransformStream.prototype.push.bind(this);
+}
+
+HeaderSetCompressor.prototype.send = function send(rep) {
+  this._log.trace({ key: rep.name, value: rep.value, index: rep.index },
+                  'Emitting header representation');
+
+  if (!rep.chunks) {
+    rep.chunks = HeaderSetCompressor.header(rep);
+  }
+  rep.chunks.forEach(this.push);
+};
+
+// `_transform` is the implementation of the [corresponding virtual function][_transform] of the
+// TransformStream class. It processes the input headers one by one:
+// [_transform]: https://nodejs.org/api/stream.html#stream_transform_transform_chunk_encoding_callback
+HeaderSetCompressor.prototype._transform = function _transform(pair, encoding, callback) {
+  var name = pair[0].toLowerCase();
+  var value = pair[1];
+  var entry, rep;
+
+  // * tries to find full (name, value) or name match in the header table
+  var nameMatch = -1, fullMatch = -1;
+  for (var droppedIndex = 0; droppedIndex < this._table.length; droppedIndex++) {
+    entry = this._table[droppedIndex];
+    if (entry[0] === name) {
+      if (entry[1] === value) {
+        fullMatch = droppedIndex;
+        break;
+      } else if (nameMatch === -1) {
+        nameMatch = droppedIndex;
+      }
+    }
+  }
+
+  var mustNeverIndex = ((name === 'cookie' && value.length < 20) ||
+                        (name === 'set-cookie' && value.length < 20) ||
+                        name === 'authorization');
+
+  if (fullMatch !== -1 && !mustNeverIndex) {
+    this.send({ name: fullMatch, value: fullMatch, index: false });
+  }
+
+  // * otherwise, it will be a literal representation (with a name index if there's a name match)
+  else {
+    entry = entryFromPair(pair);
+
+    var indexing = (entry._size < this._table._limit / 2) && !mustNeverIndex;
+
+    if (indexing) {
+      this._table.add(entry);
+    }
+
+    this.send({ name: (nameMatch !== -1) ? nameMatch : name, value: value, index: indexing, mustNeverIndex: mustNeverIndex, contextUpdate: false });
+  }
+
+  callback();
+};
+
+// `_flush` is the implementation of the [corresponding virtual function][_flush] of the
+// TransformStream class. It gets called when there's no more header to compress. The final step:
+// [_flush]: https://nodejs.org/api/stream.html#stream_transform_flush_callback
+HeaderSetCompressor.prototype._flush = function _flush(callback) {
+  callback();
+};
+
+// [Detailed Format](https://tools.ietf.org/html/rfc7541#section-5)
+// -----------------
+
+// ### Integer representation ###
+//
+// The algorithm to represent an integer I is as follows:
+//
+// 1. If I < 2^N - 1, encode I on N bits
+// 2. Else, encode 2^N - 1 on N bits and do the following steps:
+//    1. Set I to (I - (2^N - 1)) and Q to 1
+//    2. While Q > 0
+//       1. Compute Q and R, quotient and remainder of I divided by 2^7
+//       2. If Q is strictly greater than 0, write one 1 bit; otherwise, write one 0 bit
+//       3. Encode R on the next 7 bits
+//       4. I = Q
+
+HeaderSetCompressor.integer = function writeInteger(I, N) {
+  var limit = Math.pow(2,N) - 1;
+  if (I < limit) {
+    return [Buffer.from([I])];
+  }
+
+  var bytes = [];
+  if (N !== 0) {
+    bytes.push(limit);
+  }
+  I -= limit;
+
+  var Q = 1, R;
+  while (Q > 0) {
+    Q = Math.floor(I / 128);
+    R = I % 128;
+
+    if (Q > 0) {
+      R += 128;
+    }
+    bytes.push(R);
+
+    I = Q;
+  }
+
+  return [Buffer.from(bytes)];
+};
+
+// The inverse algorithm:
+//
+// 1. Set I to the number coded on the lower N bits of the first byte
+// 2. If I is smaller than 2^N - 1 then return I
+// 2. Else the number is encoded on more than one byte, so do the following steps:
+//    1. Set M to 0
+//    2. While returning with I
+//       1. Let B be the next byte (the first byte if N is 0)
+//       2. Read out the lower 7 bits of B and multiply it with 2^M
+//       3. Increase I with this number
+//       4. Increase M by 7
+//       5. Return I if the most significant bit of B is 0
+
+HeaderSetDecompressor.integer = function readInteger(buffer, N) {
+  var limit = Math.pow(2,N) - 1;
+
+  var I = buffer[buffer.cursor] & limit;
+  if (N !== 0) {
+    buffer.cursor += 1;
+  }
+
+  if (I === limit) {
+    var M = 0;
+    do {
+      I += (buffer[buffer.cursor] & 127) << M;
+      M += 7;
+      buffer.cursor += 1;
+    } while (buffer[buffer.cursor - 1] & 128);
+  }
+
+  return I;
+};
+
+// ### Huffman Encoding ###
+
+function HuffmanTable(table) {
+  function createTree(codes, position) {
+    if (codes.length === 1) {
+      return [table.indexOf(codes[0])];
+    }
+
+    else {
+      position = position || 0;
+      var zero = [];
+      var one = [];
+      for (var i = 0; i < codes.length; i++) {
+        var string = codes[i];
+        if (string[position] === '0') {
+          zero.push(string);
+        } else {
+          one.push(string);
+        }
+      }
+      return [createTree(zero, position + 1), createTree(one, position + 1)];
+    }
+  }
+
+  this.tree = createTree(table);
+
+  this.codes = table.map(function(bits) {
+    return parseInt(bits, 2);
+  });
+  this.lengths = table.map(function(bits) {
+    return bits.length;
+  });
+}
+
+HuffmanTable.prototype.encode = function encode(buffer) {
+  var result = [];
+  var space = 8;
+
+  function add(data) {
+    if (space === 8) {
+      result.push(data);
+    } else {
+      result[result.length - 1] |= data;
+    }
+  }
+
+  for (var i = 0; i < buffer.length; i++) {
+    var byte = buffer[i];
+    var code = this.codes[byte];
+    var length = this.lengths[byte];
+
+    while (length !== 0) {
+      if (space >= length) {
+        add(code << (space - length));
+        code = 0;
+        space -= length;
+        length = 0;
+      } else {
+        var shift = length - space;
+        var msb = code >> shift;
+        add(msb);
+        code -= msb << shift;
+        length -= space;
+        space = 0;
+      }
+
+      if (space === 0) {
+        space = 8;
+      }
+    }
+  }
+
+  if (space !== 8) {
+    add(this.codes[256] >> (this.lengths[256] - space));
+  }
+
+  return Buffer.from(result);
+};
+
+HuffmanTable.prototype.decode = function decode(buffer) {
+  var result = [];
+  var subtree = this.tree;
+
+  for (var i = 0; i < buffer.length; i++) {
+    var byte = buffer[i];
+
+    for (var j = 0; j < 8; j++) {
+      var bit = (byte & 128) ? 1 : 0;
+      byte = byte << 1;
+
+      subtree = subtree[bit];
+      if (subtree.length === 1) {
+        result.push(subtree[0]);
+        subtree = this.tree;
+      }
+    }
+  }
+
+  return Buffer.from(result);
+};
+
+// The initializer arrays for the Huffman tables are generated with feeding the tables from the
+// spec to this sed command:
+//
+//     sed -e "s/^.* [|]//g" -e "s/|//g" -e "s/ .*//g" -e "s/^/  '/g" -e "s/$/',/g"
+
+HuffmanTable.huffmanTable = new HuffmanTable([
+  '1111111111000',
+  '11111111111111111011000',
+  '1111111111111111111111100010',
+  '1111111111111111111111100011',
+  '1111111111111111111111100100',
+  '1111111111111111111111100101',
+  '1111111111111111111111100110',
+  '1111111111111111111111100111',
+  '1111111111111111111111101000',
+  '111111111111111111101010',
+  '111111111111111111111111111100',
+  '1111111111111111111111101001',
+  '1111111111111111111111101010',
+  '111111111111111111111111111101',
+  '1111111111111111111111101011',
+  '1111111111111111111111101100',
+  '1111111111111111111111101101',
+  '1111111111111111111111101110',
+  '1111111111111111111111101111',
+  '1111111111111111111111110000',
+  '1111111111111111111111110001',
+  '1111111111111111111111110010',
+  '111111111111111111111111111110',
+  '1111111111111111111111110011',
+  '1111111111111111111111110100',
+  '1111111111111111111111110101',
+  '1111111111111111111111110110',
+  '1111111111111111111111110111',
+  '1111111111111111111111111000',
+  '1111111111111111111111111001',
+  '1111111111111111111111111010',
+  '1111111111111111111111111011',
+  '010100',
+  '1111111000',
+  '1111111001',
+  '111111111010',
+  '1111111111001',
+  '010101',
+  '11111000',
+  '11111111010',
+  '1111111010',
+  '1111111011',
+  '11111001',
+  '11111111011',
+  '11111010',
+  '010110',
+  '010111',
+  '011000',
+  '00000',
+  '00001',
+  '00010',
+  '011001',
+  '011010',
+  '011011',
+  '011100',
+  '011101',
+  '011110',
+  '011111',
+  '1011100',
+  '11111011',
+  '111111111111100',
+  '100000',
+  '111111111011',
+  '1111111100',
+  '1111111111010',
+  '100001',
+  '1011101',
+  '1011110',
+  '1011111',
+  '1100000',
+  '1100001',
+  '1100010',
+  '1100011',
+  '1100100',
+  '1100101',
+  '1100110',
+  '1100111',
+  '1101000',
+  '1101001',
+  '1101010',
+  '1101011',
+  '1101100',
+  '1101101',
+  '1101110',
+  '1101111',
+  '1110000',
+  '1110001',
+  '1110010',
+  '11111100',
+  '1110011',
+  '11111101',
+  '1111111111011',
+  '1111111111111110000',
+  '1111111111100',
+  '11111111111100',
+  '100010',
+  '111111111111101',
+  '00011',
+  '100011',
+  '00100',
+  '100100',
+  '00101',
+  '100101',
+  '100110',
+  '100111',
+  '00110',
+  '1110100',
+  '1110101',
+  '101000',
+  '101001',
+  '101010',
+  '00111',
+  '101011',
+  '1110110',
+  '101100',
+  '01000',
+  '01001',
+  '101101',
+  '1110111',
+  '1111000',
+  '1111001',
+  '1111010',
+  '1111011',
+  '111111111111110',
+  '11111111100',
+  '11111111111101',
+  '1111111111101',
+  '1111111111111111111111111100',
+  '11111111111111100110',
+  '1111111111111111010010',
+  '11111111111111100111',
+  '11111111111111101000',
+  '1111111111111111010011',
+  '1111111111111111010100',
+  '1111111111111111010101',
+  '11111111111111111011001',
+  '1111111111111111010110',
+  '11111111111111111011010',
+  '11111111111111111011011',
+  '11111111111111111011100',
+  '11111111111111111011101',
+  '11111111111111111011110',
+  '111111111111111111101011',
+  '11111111111111111011111',
+  '111111111111111111101100',
+  '111111111111111111101101',
+  '1111111111111111010111',
+  '11111111111111111100000',
+  '111111111111111111101110',
+  '11111111111111111100001',
+  '11111111111111111100010',
+  '11111111111111111100011',
+  '11111111111111111100100',
+  '111111111111111011100',
+  '1111111111111111011000',
+  '11111111111111111100101',
+  '1111111111111111011001',
+  '11111111111111111100110',
+  '11111111111111111100111',
+  '111111111111111111101111',
+  '1111111111111111011010',
+  '111111111111111011101',
+  '11111111111111101001',
+  '1111111111111111011011',
+  '1111111111111111011100',
+  '11111111111111111101000',
+  '11111111111111111101001',
+  '111111111111111011110',
+  '11111111111111111101010',
+  '1111111111111111011101',
+  '1111111111111111011110',
+  '111111111111111111110000',
+  '111111111111111011111',
+  '1111111111111111011111',
+  '11111111111111111101011',
+  '11111111111111111101100',
+  '111111111111111100000',
+  '111111111111111100001',
+  '1111111111111111100000',
+  '111111111111111100010',
+  '11111111111111111101101',
+  '1111111111111111100001',
+  '11111111111111111101110',
+  '11111111111111111101111',
+  '11111111111111101010',
+  '1111111111111111100010',
+  '1111111111111111100011',
+  '1111111111111111100100',
+  '11111111111111111110000',
+  '1111111111111111100101',
+  '1111111111111111100110',
+  '11111111111111111110001',
+  '11111111111111111111100000',
+  '11111111111111111111100001',
+  '11111111111111101011',
+  '1111111111111110001',
+  '1111111111111111100111',
+  '11111111111111111110010',
+  '1111111111111111101000',
+  '1111111111111111111101100',
+  '11111111111111111111100010',
+  '11111111111111111111100011',
+  '11111111111111111111100100',
+  '111111111111111111111011110',
+  '111111111111111111111011111',
+  '11111111111111111111100101',
+  '111111111111111111110001',
+  '1111111111111111111101101',
+  '1111111111111110010',
+  '111111111111111100011',
+  '11111111111111111111100110',
+  '111111111111111111111100000',
+  '111111111111111111111100001',
+  '11111111111111111111100111',
+  '111111111111111111111100010',
+  '111111111111111111110010',
+  '111111111111111100100',
+  '111111111111111100101',
+  '11111111111111111111101000',
+  '11111111111111111111101001',
+  '1111111111111111111111111101',
+  '111111111111111111111100011',
+  '111111111111111111111100100',
+  '111111111111111111111100101',
+  '11111111111111101100',
+  '111111111111111111110011',
+  '11111111111111101101',
+  '111111111111111100110',
+  '1111111111111111101001',
+  '111111111111111100111',
+  '111111111111111101000',
+  '11111111111111111110011',
+  '1111111111111111101010',
+  '1111111111111111101011',
+  '1111111111111111111101110',
+  '1111111111111111111101111',
+  '111111111111111111110100',
+  '111111111111111111110101',
+  '11111111111111111111101010',
+  '11111111111111111110100',
+  '11111111111111111111101011',
+  '111111111111111111111100110',
+  '11111111111111111111101100',
+  '11111111111111111111101101',
+  '111111111111111111111100111',
+  '111111111111111111111101000',
+  '111111111111111111111101001',
+  '111111111111111111111101010',
+  '111111111111111111111101011',
+  '1111111111111111111111111110',
+  '111111111111111111111101100',
+  '111111111111111111111101101',
+  '111111111111111111111101110',
+  '111111111111111111111101111',
+  '111111111111111111111110000',
+  '11111111111111111111101110',
+  '111111111111111111111111111111'
+]);
+
+// ### String literal representation ###
+//
+// Literal **strings** can represent header names or header values. There's two variant of the
+// string encoding:
+//
+// String literal with Huffman encoding:
+//
+//       0   1   2   3   4   5   6   7
+//     +---+---+---+---+---+---+---+---+
+//     | 1 |  Value Length Prefix (7)  |
+//     +---+---+---+---+---+---+---+---+
+//     |   Value Length (0-N bytes)    |
+//     +---+---+---+---+---+---+---+---+
+//     ...
+//     +---+---+---+---+---+---+---+---+
+//     | Huffman Encoded Data  |Padding|
+//     +---+---+---+---+---+---+---+---+
+//
+// String literal without Huffman encoding:
+//
+//       0   1   2   3   4   5   6   7
+//     +---+---+---+---+---+---+---+---+
+//     | 0 |  Value Length Prefix (7)  |
+//     +---+---+---+---+---+---+---+---+
+//     |   Value Length (0-N bytes)    |
+//     +---+---+---+---+---+---+---+---+
+//     ...
+//     +---+---+---+---+---+---+---+---+
+//     |  Field Bytes Without Encoding |
+//     +---+---+---+---+---+---+---+---+
+
+HeaderSetCompressor.string = function writeString(str) {
+  str = Buffer.from(str, 'utf8');
+
+  var huffman = HuffmanTable.huffmanTable.encode(str);
+  if (huffman.length < str.length) {
+    var length = HeaderSetCompressor.integer(huffman.length, 7);
+    length[0][0] |= 128;
+    return length.concat(huffman);
+  }
+
+  else {
+    length = HeaderSetCompressor.integer(str.length, 7);
+    return length.concat(str);
+  }
+};
+
+HeaderSetDecompressor.string = function readString(buffer) {
+  var huffman = buffer[buffer.cursor] & 128;
+  var length = HeaderSetDecompressor.integer(buffer, 7);
+  var encoded = buffer.slice(buffer.cursor, buffer.cursor + length);
+  buffer.cursor += length;
+  return (huffman ? HuffmanTable.huffmanTable.decode(encoded) : encoded).toString('utf8');
+};
+
+// ### Header represenations ###
+
+// The JavaScript object representation is described near the
+// `HeaderSetDecompressor.prototype._execute()` method definition.
+//
+// **All binary header representations** start with a prefix signaling the representation type and
+// an index represented using prefix coded integers:
+//
+//       0   1   2   3   4   5   6   7
+//     +---+---+---+---+---+---+---+---+
+//     | 1 |        Index (7+)         |  Indexed Representation
+//     +---+---------------------------+
+//
+//       0   1   2   3   4   5   6   7
+//     +---+---+---+---+---+---+---+---+
+//     | 0 | 1 |      Index (6+)       |
+//     +---+---+---+-------------------+  Literal w/ Indexing
+//     |       Value Length (8+)       |
+//     +-------------------------------+  w/ Indexed Name
+//     | Value String (Length octets)  |
+//     +-------------------------------+
+//
+//       0   1   2   3   4   5   6   7
+//     +---+---+---+---+---+---+---+---+
+//     | 0 | 1 |           0           |
+//     +---+---+---+-------------------+
+//     |       Name Length (8+)        |
+//     +-------------------------------+  Literal w/ Indexing
+//     |  Name String (Length octets)  |
+//     +-------------------------------+  w/ New Name
+//     |       Value Length (8+)       |
+//     +-------------------------------+
+//     | Value String (Length octets)  |
+//     +-------------------------------+
+//
+//       0   1   2   3   4   5   6   7
+//     +---+---+---+---+---+---+---+---+
+//     | 0 | 0 | 0 | 0 |  Index (4+)   |
+//     +---+---+---+-------------------+  Literal w/o Incremental Indexing
+//     |       Value Length (8+)       |
+//     +-------------------------------+  w/ Indexed Name
+//     | Value String (Length octets)  |
+//     +-------------------------------+
+//
+//       0   1   2   3   4   5   6   7
+//     +---+---+---+---+---+---+---+---+
+//     | 0 | 0 | 0 | 0 |       0       |
+//     +---+---+---+-------------------+
+//     |       Name Length (8+)        |
+//     +-------------------------------+  Literal w/o Incremental Indexing
+//     |  Name String (Length octets)  |
+//     +-------------------------------+  w/ New Name
+//     |       Value Length (8+)       |
+//     +-------------------------------+
+//     | Value String (Length octets)  |
+//     +-------------------------------+
+//
+//       0   1   2   3   4   5   6   7
+//     +---+---+---+---+---+---+---+---+
+//     | 0 | 0 | 0 | 1 |  Index (4+)   |
+//     +---+---+---+-------------------+  Literal never indexed
+//     |       Value Length (8+)       |
+//     +-------------------------------+  w/ Indexed Name
+//     | Value String (Length octets)  |
+//     +-------------------------------+
+//
+//       0   1   2   3   4   5   6   7
+//     +---+---+---+---+---+---+---+---+
+//     | 0 | 0 | 0 | 1 |       0       |
+//     +---+---+---+-------------------+
+//     |       Name Length (8+)        |
+//     +-------------------------------+  Literal never indexed
+//     |  Name String (Length octets)  |
+//     +-------------------------------+  w/ New Name
+//     |       Value Length (8+)       |
+//     +-------------------------------+
+//     | Value String (Length octets)  |
+//     +-------------------------------+
+//
+// The **Indexed Representation** consists of the 1-bit prefix and the Index that is represented as
+// a 7-bit prefix coded integer and nothing else.
+//
+// After the first bits, **all literal representations** specify the header name, either as a
+// pointer to the Header Table (Index) or a string literal. When the string literal representation
+// is used, the Index is set to 0 and the string literal starts at the second byte.
+//
+// For **all literal representations**, the specification of the header value comes next. It is
+// always represented as a string.
+
+var representations = {
+  indexed             : { prefix: 7, pattern: 0x80 },
+  literalIncremental  : { prefix: 6, pattern: 0x40 },
+  contextUpdate       : { prefix: 0, pattern: 0x20 },
+  literalNeverIndexed : { prefix: 4, pattern: 0x10 },
+  literal             : { prefix: 4, pattern: 0x00 }
+};
+
+HeaderSetCompressor.header = function writeHeader(header) {
+  var representation, buffers = [];
+
+  if (header.contextUpdate) {
+    representation = representations.contextUpdate;
+  } else if (typeof header.value === 'number') {
+    representation = representations.indexed;
+  } else if (header.index) {
+    representation = representations.literalIncremental;
+  } else if (header.mustNeverIndex) {
+    representation = representations.literalNeverIndexed;
+  } else {
+    representation = representations.literal;
+  }
+
+  if (representation === representations.contextUpdate) {
+    buffers.push(HeaderSetCompressor.integer(header.newMaxSize, 5));
+  }
+
+  else if (representation === representations.indexed) {
+    buffers.push(HeaderSetCompressor.integer(header.value + 1, representation.prefix));
+  }
+
+  else {
+    if (typeof header.name === 'number') {
+      buffers.push(HeaderSetCompressor.integer(header.name + 1, representation.prefix));
+    } else {
+      buffers.push(HeaderSetCompressor.integer(0, representation.prefix));
+      buffers.push(HeaderSetCompressor.string(header.name));
+    }
+    buffers.push(HeaderSetCompressor.string(header.value));
+  }
+
+  buffers[0][0][0] |= representation.pattern;
+
+  return Array.prototype.concat.apply([], buffers); // array of arrays of buffers -> array of buffers
+};
+
+HeaderSetDecompressor.header = function readHeader(buffer) {
+  var representation, header = {};
+
+  var firstByte = buffer[buffer.cursor];
+  if (firstByte & 0x80) {
+    representation = representations.indexed;
+  } else if (firstByte & 0x40) {
+    representation = representations.literalIncremental;
+  } else if (firstByte & 0x20) {
+    representation = representations.contextUpdate;
+  } else if (firstByte & 0x10) {
+    representation = representations.literalNeverIndexed;
+  } else {
+    representation = representations.literal;
+  }
+
+  header.value = header.name = -1;
+  header.index = false;
+  header.contextUpdate = false;
+  header.newMaxSize = 0;
+  header.mustNeverIndex = false;
+
+  if (representation === representations.contextUpdate) {
+    header.contextUpdate = true;
+    header.newMaxSize = HeaderSetDecompressor.integer(buffer, 5);
+  }
+
+  else if (representation === representations.indexed) {
+    header.value = header.name = HeaderSetDecompressor.integer(buffer, representation.prefix) - 1;
+  }
+
+  else {
+    header.name = HeaderSetDecompressor.integer(buffer, representation.prefix) - 1;
+    if (header.name === -1) {
+      header.name = HeaderSetDecompressor.string(buffer);
+    }
+    header.value = HeaderSetDecompressor.string(buffer);
+    header.index = (representation === representations.literalIncremental);
+    header.mustNeverIndex = (representation === representations.literalNeverIndexed);
+  }
+
+  return header;
+};
+
+// Integration with HTTP/2
+// =======================
+
+// This section describes the interaction between the compressor/decompressor and the rest of the
+// HTTP/2 implementation. The `Compressor` and the `Decompressor` makes up a layer between the
+// [framer](framer.html) and the [connection handling component](connection.html). They let most
+// frames pass through, except HEADERS and PUSH_PROMISE frames. They convert the frames between
+// these two representations:
+//
+//     {                                   {
+//      type: 'HEADERS',                    type: 'HEADERS',
+//      flags: {},                          flags: {},
+//      stream: 1,               <===>      stream: 1,
+//      headers: {                          data: Buffer
+//       N1: 'V1',                         }
+//       N2: ['V1', 'V2', ...],
+//       // ...
+//      }
+//     }
+//
+// There are possibly several binary frame that belong to a single non-binary frame.
+
+var MAX_HTTP_PAYLOAD_SIZE = 16384;
+
+// The Compressor class
+// --------------------
+
+// The Compressor transform stream is basically stateless.
+util.inherits(Compressor, TransformStream);
+function Compressor(log, type) {
+  TransformStream.call(this, { objectMode: true });
+
+  this._log = log.child({ component: 'compressor' });
+
+  assert((type === 'REQUEST') || (type === 'RESPONSE'));
+  this._table = new HeaderTable(this._log);
+
+  this.tableSizeChangePending = false;
+  this.lowestTableSizePending = 0;
+  this.tableSizeSetting = DEFAULT_HEADER_TABLE_LIMIT;
+}
+
+// Changing the header table size
+Compressor.prototype.setTableSizeLimit = function setTableSizeLimit(size) {
+  this._table.setSizeLimit(size);
+  if (!this.tableSizeChangePending || size < this.lowestTableSizePending) {
+    this.lowestTableSizePending = size;
+  }
+  this.tableSizeSetting = size;
+  this.tableSizeChangePending = true;
+};
+
+// `compress` takes a header set, and compresses it using a new `HeaderSetCompressor` stream
+// instance. This means that from now on, the advantages of streaming header encoding are lost,
+// but the API becomes simpler.
+Compressor.prototype.compress = function compress(headers) {
+  var compressor = new HeaderSetCompressor(this._log, this._table);
+
+  if (this.tableSizeChangePending) {
+    if (this.lowestTableSizePending < this.tableSizeSetting) {
+      compressor.send({contextUpdate: true, newMaxSize: this.lowestTableSizePending,
+                       name: "", value: "", index: 0});
+    }
+    compressor.send({contextUpdate: true, newMaxSize: this.tableSizeSetting,
+                     name: "", value: "", index: 0});
+    this.tableSizeChangePending = false;
+  }
+  var colonHeaders = [];
+  var nonColonHeaders = [];
+
+  // To ensure we send colon headers first
+  for (var name in headers) {
+    if (name.trim()[0] === ':') {
+      colonHeaders.push(name);
+    } else {
+      nonColonHeaders.push(name);
+    }
+  }
+
+  function compressHeader(name) {
+    var value = headers[name];
+    name = String(name).toLowerCase();
+
+    // * To allow for better compression efficiency, the Cookie header field MAY be split into
+    //   separate header fields, each with one or more cookie-pairs.
+    if (name == 'cookie') {
+      if (!(value instanceof Array)) {
+        value = [value];
+      }
+      value = Array.prototype.concat.apply([], value.map(function(cookie) {
+        return String(cookie).split(';').map(trim);
+      }));
+    }
+
+    if (value instanceof Array) {
+      for (var i = 0; i < value.length; i++) {
+        compressor.write([name, String(value[i])]);
+      }
+    } else {
+      compressor.write([name, String(value)]);
+    }
+  }
+
+  colonHeaders.forEach(compressHeader);
+  nonColonHeaders.forEach(compressHeader);
+
+  compressor.end();
+
+  var chunk, chunks = [];
+  while (chunk = compressor.read()) {
+    chunks.push(chunk);
+  }
+
+  function insertSoftIllegalHpack(originalCompressed) {
+    var illegalLiteral = Buffer.from([
+      0x00, // Literal, no index
+      0x08, // Name: not huffman encoded, 8 bytes long
+      0x3a,
+      0x69,
+      0x6c,
+      0x6c,
+      0x65,
+      0x67,
+      0x61,
+      0x6c, // :illegal
+      0x10, // Value: not huffman encoded, 16 bytes long
+      // REALLY NOT LEGAL
+      0x52,
+      0x45,
+      0x41,
+      0x4c,
+      0x4c,
+      0x59,
+      0x20,
+      0x4e,
+      0x4f,
+      0x54,
+      0x20,
+      0x4c,
+      0x45,
+      0x47,
+      0x41,
+      0x4c,
+    ]);
+    var newBufferLength = originalCompressed.length + illegalLiteral.length;
+    var concatenated = Buffer.alloc(newBufferLength);
+    originalCompressed.copy(concatenated, 0);
+    illegalLiteral.copy(concatenated, originalCompressed.length);
+    return concatenated;
+  }
+
+  function insertHardIllegalHpack(originalCompressed) {
+    // Now we have to add an invalid header
+    var illegalIndexed = HeaderSetCompressor.integer(5000, 7);
+    // The above returns an array of buffers, but there's only one buffer, so
+    // get rid of the array.
+    illegalIndexed = illegalIndexed[0];
+    // Set the first bit to 1 to signal this is an indexed representation
+    illegalIndexed[0] |= 0x80;
+    var newBufferLength = originalCompressed.length + illegalIndexed.length;
+    var concatenated = Buffer.alloc(newBufferLength);
+    originalCompressed.copy(concatenated, 0);
+    illegalIndexed.copy(concatenated, originalCompressed.length);
+    return concatenated;
+  }
+
+  if ("x-softillegalhpack" in headers) {
+    return insertSoftIllegalHpack(concat(chunks));
+  }
+
+  if ("x-hardillegalhpack" in headers) {
+    return insertHardIllegalHpack(concat(chunks));
+  }
+
+  return concat(chunks);
+};
+
+// When a `frame` arrives
+Compressor.prototype._transform = function _transform(frame, encoding, done) {
+  // * and it is a HEADERS or PUSH_PROMISE frame
+  //   * it generates a header block using the compress method
+  //   * cuts the header block into `chunks` that are not larger than `MAX_HTTP_PAYLOAD_SIZE`
+  //   * for each chunk, it pushes out a chunk frame that is identical to the original, except
+  //     the `data` property which holds the given chunk, the type of the frame which is always
+  //     CONTINUATION except for the first frame, and the END_HEADERS/END_PUSH_STREAM flag that
+  //     marks the last frame and the END_STREAM flag which is always false before the end
+  if (frame.type === 'HEADERS' || frame.type === 'PUSH_PROMISE') {
+    var buffer = this.compress(frame.headers);
+
+    // This will result in CONTINUATIONs from a PUSH_PROMISE being 4 bytes shorter than they could
+    // be, but that's not the end of the world, and it prevents us from going over MAX_HTTP_PAYLOAD_SIZE
+    // on the initial PUSH_PROMISE frame.
+    var adjustment = frame.type === 'PUSH_PROMISE' ? 4 : 0;
+    var chunks = cut(buffer, MAX_HTTP_PAYLOAD_SIZE - adjustment);
+
+    for (var i = 0; i < chunks.length; i++) {
+      var chunkFrame;
+      var first = (i === 0);
+      var last = (i === chunks.length - 1);
+
+      if (first) {
+        chunkFrame = util._extend({}, frame);
+        chunkFrame.flags = util._extend({}, frame.flags);
+        chunkFrame.flags['END_' + frame.type] = last;
+      } else {
+        chunkFrame = {
+          type: 'CONTINUATION',
+          flags: { END_HEADERS: last },
+          stream: frame.stream
+        };
+      }
+      chunkFrame.data = chunks[i];
+
+      this.push(chunkFrame);
+    }
+  }
+
+  // * otherwise, the frame is forwarded without taking any action
+  else {
+    this.push(frame);
+  }
+
+  done();
+};
+
+// The Decompressor class
+// ----------------------
+
+// The Decompressor is a stateful transform stream, since it has to collect multiple frames first,
+// and the decoding comes after unifying the payload of those frames.
+//
+// If there's a frame in progress, `this._inProgress` is `true`. The frames are collected in
+// `this._frames`, and the type of the frame and the stream identifier is stored in `this._type`
+// and `this._stream` respectively.
+util.inherits(Decompressor, TransformStream);
+function Decompressor(log, type) {
+  TransformStream.call(this, { objectMode: true });
+
+  this._log = log.child({ component: 'compressor' });
+
+  assert((type === 'REQUEST') || (type === 'RESPONSE'));
+  this._table = new HeaderTable(this._log);
+
+  this._inProgress = false;
+  this._base = undefined;
+}
+
+// Changing the header table size
+Decompressor.prototype.setTableSizeLimit = function setTableSizeLimit(size) {
+  this._table.setSizeLimit(size);
+};
+
+// `decompress` takes a full header block, and decompresses it using a new `HeaderSetDecompressor`
+// stream instance. This means that from now on, the advantages of streaming header decoding are
+// lost, but the API becomes simpler.
+Decompressor.prototype.decompress = function decompress(block) {
+  var decompressor = new HeaderSetDecompressor(this._log, this._table);
+  decompressor.end(block);
+
+  var seenNonColonHeader = false;
+  var headers = {};
+  var pair;
+  while (pair = decompressor.read()) {
+    var name = pair[0];
+    var value = pair[1];
+    var isColonHeader = (name.trim()[0] === ':');
+    if (seenNonColonHeader && isColonHeader) {
+        this.emit('error', 'PROTOCOL_ERROR');
+        return headers;
+    }
+    seenNonColonHeader = !isColonHeader;
+    if (name in headers) {
+      if (headers[name] instanceof Array) {
+        headers[name].push(value);
+      } else {
+        headers[name] = [headers[name], value];
+      }
+    } else {
+      headers[name] = value;
+    }
+  }
+
+  // * If there are multiple Cookie header fields after decompression, these MUST be concatenated
+  //   into a single octet string using the two octet delimiter of 0x3B, 0x20 (the ASCII
+  //   string "; ").
+  if (('cookie' in headers) && (headers['cookie'] instanceof Array)) {
+    headers['cookie'] = headers['cookie'].join('; ');
+  }
+
+  return headers;
+};
+
+// When a `frame` arrives
+Decompressor.prototype._transform = function _transform(frame, encoding, done) {
+  // * and the collection process is already `_inProgress`, the frame is simply stored, except if
+  //   it's an illegal frame
+  if (this._inProgress) {
+    if ((frame.type !== 'CONTINUATION') || (frame.stream !== this._base.stream)) {
+      this._log.error('A series of HEADER frames were not continuous');
+      this.emit('error', 'PROTOCOL_ERROR');
+      return;
+    }
+    this._frames.push(frame);
+  }
+
+  // * and the collection process is not `_inProgress`, but the new frame's type is HEADERS or
+  //   PUSH_PROMISE, a new collection process begins
+  else if ((frame.type === 'HEADERS') || (frame.type === 'PUSH_PROMISE')) {
+    this._inProgress = true;
+    this._base = util._extend({}, frame);
+    this._frames = [frame];
+  }
+
+  // * otherwise, the frame is forwarded without taking any action
+  else {
+    this.push(frame);
+  }
+
+  // * When the frame signals that it's the last in the series, the header block chunks are
+  //   concatenated, the headers are decompressed, and a new frame gets pushed out with the
+  //   decompressed headers.
+  if (this._inProgress && (frame.flags.END_HEADERS || frame.flags.END_PUSH_PROMISE)) {
+    var buffer = concat(this._frames.map(function(frame) {
+      return frame.data;
+    }));
+    try {
+      var headers = this.decompress(buffer);
+    } catch(error) {
+      this._log.error({ err: error }, 'Header decompression error');
+      this.emit('error', 'COMPRESSION_ERROR');
+      return;
+    }
+    this.push(util._extend(this._base, { headers: headers }));
+    this._inProgress = false;
+  }
+
+  done();
+};
+
+// Helper functions
+// ================
+
+// Concatenate an array of buffers into a new buffer
+function concat(buffers) {
+  var size = 0;
+  for (var i = 0; i < buffers.length; i++) {
+    size += buffers[i].length;
+  }
+
+  var concatenated = Buffer.alloc(size);
+  for (var cursor = 0, j = 0; j < buffers.length; cursor += buffers[j].length, j++) {
+    buffers[j].copy(concatenated, cursor);
+  }
+
+  return concatenated;
+}
+
+// Cut `buffer` into chunks not larger than `size`
+function cut(buffer, size) {
+  var chunks = [];
+  var cursor = 0;
+  do {
+    var chunkSize = Math.min(size, buffer.length - cursor);
+    chunks.push(buffer.slice(cursor, cursor + chunkSize));
+    cursor += chunkSize;
+  } while(cursor < buffer.length);
+  return chunks;
+}
+
+function trim(string) {
+  return string.trim();
+}