1%% Copyright (c) 2015-2018, Loïc Hoguin <essen@ninenines.eu> 2%% 3%% Permission to use, copy, modify, and/or distribute this software for any 4%% purpose with or without fee is hereby granted, provided that the above 5%% copyright notice and this permission notice appear in all copies. 6%% 7%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 8%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 9%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 10%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 11%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 12%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 13%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 14 15%% The current implementation is not suitable for use in 16%% intermediaries as the information about headers that 17%% should never be indexed is currently lost. 18 19-module(cow_hpack). 20-dialyzer(no_improper_lists). 21 22-export([init/0]). 23-export([init/1]). 24-export([set_max_size/2]). 25 26-export([decode/1]). 27-export([decode/2]). 28 29-export([encode/1]). 30-export([encode/2]). 31-export([encode/3]). 32 33-record(state, { 34 size = 0 :: non_neg_integer(), 35 max_size = 4096 :: non_neg_integer(), 36 configured_max_size = 4096 :: non_neg_integer(), 37 dyn_table = [] :: [{pos_integer(), {binary(), binary()}}] 38}). 39 40-opaque state() :: #state{}. 41-export_type([state/0]). 42 43-type opts() :: map(). 44-export_type([opts/0]). 45 46-ifdef(TEST). 47-include_lib("proper/include/proper.hrl"). 48-endif. 49 50%% State initialization. 51 52-spec init() -> state(). 53init() -> 54 #state{}. 55 56-spec init(non_neg_integer()) -> state(). 57init(MaxSize) -> 58 #state{max_size=MaxSize, configured_max_size=MaxSize}. 59 60%% Update the configured max size. 61%% 62%% When decoding, the local endpoint also needs to send a SETTINGS 63%% frame with this value and it is then up to the remote endpoint 64%% to decide what actual limit it will use. The actual limit is 65%% signaled via dynamic table size updates in the encoded data. 66%% 67%% When encoding, the local endpoint will call this function after 68%% receiving a SETTINGS frame with this value. The encoder will 69%% then use this value as the new max after signaling via a dynamic 70%% table size update. The value given as argument may be lower 71%% than the one received in the SETTINGS. 72 73-spec set_max_size(non_neg_integer(), State) -> State when State::state(). 74set_max_size(MaxSize, State) -> 75 State#state{configured_max_size=MaxSize}. 76 77%% Decoding. 78 79-spec decode(binary()) -> {cow_http:headers(), state()}. 80decode(Data) -> 81 decode(Data, init()). 82 83-spec decode(binary(), State) -> {cow_http:headers(), State} when State::state(). 84%% Dynamic table size update is only allowed at the beginning of a HEADERS block. 85decode(<< 0:2, 1:1, Rest/bits >>, State=#state{configured_max_size=ConfigMaxSize}) -> 86 {MaxSize, Rest2} = dec_int5(Rest), 87 if 88 MaxSize =< ConfigMaxSize -> 89 State2 = table_update_size(MaxSize, State), 90 decode(Rest2, State2) 91 end; 92decode(Data, State) -> 93 decode(Data, State, []). 94 95decode(<<>>, State, Acc) -> 96 {lists:reverse(Acc), State}; 97%% Indexed header field representation. 98decode(<< 1:1, Rest/bits >>, State, Acc) -> 99 dec_indexed(Rest, State, Acc); 100%% Literal header field with incremental indexing: new name. 101decode(<< 0:1, 1:1, 0:6, Rest/bits >>, State, Acc) -> 102 dec_lit_index_new_name(Rest, State, Acc); 103%% Literal header field with incremental indexing: indexed name. 104decode(<< 0:1, 1:1, Rest/bits >>, State, Acc) -> 105 dec_lit_index_indexed_name(Rest, State, Acc); 106%% Literal header field without indexing: new name. 107decode(<< 0:8, Rest/bits >>, State, Acc) -> 108 dec_lit_no_index_new_name(Rest, State, Acc); 109%% Literal header field without indexing: indexed name. 110decode(<< 0:4, Rest/bits >>, State, Acc) -> 111 dec_lit_no_index_indexed_name(Rest, State, Acc); 112%% Literal header field never indexed: new name. 113%% @todo Keep track of "never indexed" headers. 114decode(<< 0:3, 1:1, 0:4, Rest/bits >>, State, Acc) -> 115 dec_lit_no_index_new_name(Rest, State, Acc); 116%% Literal header field never indexed: indexed name. 117%% @todo Keep track of "never indexed" headers. 118decode(<< 0:3, 1:1, Rest/bits >>, State, Acc) -> 119 dec_lit_no_index_indexed_name(Rest, State, Acc). 120 121%% Indexed header field representation. 122 123%% We do the integer decoding inline where appropriate, falling 124%% back to dec_big_int for larger values. 125dec_indexed(<<2#1111111:7, 0:1, Int:7, Rest/bits>>, State, Acc) -> 126 {Name, Value} = table_get(127 + Int, State), 127 decode(Rest, State, [{Name, Value}|Acc]); 128dec_indexed(<<2#1111111:7, Rest0/bits>>, State, Acc) -> 129 {Index, Rest} = dec_big_int(Rest0, 127, 0), 130 {Name, Value} = table_get(Index, State), 131 decode(Rest, State, [{Name, Value}|Acc]); 132dec_indexed(<<Index:7, Rest/bits>>, State, Acc) -> 133 {Name, Value} = table_get(Index, State), 134 decode(Rest, State, [{Name, Value}|Acc]). 135 136%% Literal header field with incremental indexing. 137 138dec_lit_index_new_name(Rest, State, Acc) -> 139 {Name, Rest2} = dec_str(Rest), 140 dec_lit_index(Rest2, State, Acc, Name). 141 142%% We do the integer decoding inline where appropriate, falling 143%% back to dec_big_int for larger values. 144dec_lit_index_indexed_name(<<2#111111:6, 0:1, Int:7, Rest/bits>>, State, Acc) -> 145 Name = table_get_name(63 + Int, State), 146 dec_lit_index(Rest, State, Acc, Name); 147dec_lit_index_indexed_name(<<2#111111:6, Rest0/bits>>, State, Acc) -> 148 {Index, Rest} = dec_big_int(Rest0, 63, 0), 149 Name = table_get_name(Index, State), 150 dec_lit_index(Rest, State, Acc, Name); 151dec_lit_index_indexed_name(<<Index:6, Rest/bits>>, State, Acc) -> 152 Name = table_get_name(Index, State), 153 dec_lit_index(Rest, State, Acc, Name). 154 155dec_lit_index(Rest, State, Acc, Name) -> 156 {Value, Rest2} = dec_str(Rest), 157 State2 = table_insert({Name, Value}, State), 158 decode(Rest2, State2, [{Name, Value}|Acc]). 159 160%% Literal header field without indexing. 161 162dec_lit_no_index_new_name(Rest, State, Acc) -> 163 {Name, Rest2} = dec_str(Rest), 164 dec_lit_no_index(Rest2, State, Acc, Name). 165 166%% We do the integer decoding inline where appropriate, falling 167%% back to dec_big_int for larger values. 168dec_lit_no_index_indexed_name(<<2#1111:4, 0:1, Int:7, Rest/bits>>, State, Acc) -> 169 Name = table_get_name(15 + Int, State), 170 dec_lit_no_index(Rest, State, Acc, Name); 171dec_lit_no_index_indexed_name(<<2#1111:4, Rest0/bits>>, State, Acc) -> 172 {Index, Rest} = dec_big_int(Rest0, 15, 0), 173 Name = table_get_name(Index, State), 174 dec_lit_no_index(Rest, State, Acc, Name); 175dec_lit_no_index_indexed_name(<<Index:4, Rest/bits>>, State, Acc) -> 176 Name = table_get_name(Index, State), 177 dec_lit_no_index(Rest, State, Acc, Name). 178 179dec_lit_no_index(Rest, State, Acc, Name) -> 180 {Value, Rest2} = dec_str(Rest), 181 decode(Rest2, State, [{Name, Value}|Acc]). 182 183%% @todo Literal header field never indexed. 184 185%% Decode an integer. 186 187%% The HPACK format has 4 different integer prefixes length (from 4 to 7) 188%% and each can be used to create an indefinite length integer if all bits 189%% of the prefix are set to 1. 190 191dec_int5(<< 2#11111:5, Rest/bits >>) -> 192 dec_big_int(Rest, 31, 0); 193dec_int5(<< Int:5, Rest/bits >>) -> 194 {Int, Rest}. 195 196dec_big_int(<< 0:1, Value:7, Rest/bits >>, Int, M) -> 197 {Int + (Value bsl M), Rest}; 198dec_big_int(<< 1:1, Value:7, Rest/bits >>, Int, M) -> 199 dec_big_int(Rest, Int + (Value bsl M), M + 7). 200 201%% Decode a string. 202 203dec_str(<<0:1, 2#1111111:7, Rest0/bits>>) -> 204 {Length, Rest1} = dec_big_int(Rest0, 127, 0), 205 <<Str:Length/binary, Rest/bits>> = Rest1, 206 {Str, Rest}; 207dec_str(<<0:1, Length:7, Rest0/bits>>) -> 208 <<Str:Length/binary, Rest/bits>> = Rest0, 209 {Str, Rest}; 210dec_str(<<1:1, 2#1111111:7, Rest0/bits>>) -> 211 {Length, Rest} = dec_big_int(Rest0, 127, 0), 212 dec_huffman(Rest, Length, 0, <<>>); 213dec_str(<<1:1, Length:7, Rest/bits>>) -> 214 dec_huffman(Rest, Length, 0, <<>>). 215 216%% We use a lookup table that allows us to benefit from 217%% the binary match context optimization. A more naive 218%% implementation using bit pattern matching cannot reuse 219%% a match context because it wouldn't always match on 220%% byte boundaries. 221%% 222%% See cow_hpack_dec_huffman_lookup.hrl for more details. 223 224dec_huffman(<<A:4, B:4, R/bits>>, Len, Huff0, Acc) when Len > 1 -> 225 {_, CharA, Huff1} = dec_huffman_lookup(Huff0, A), 226 {_, CharB, Huff} = dec_huffman_lookup(Huff1, B), 227 case {CharA, CharB} of 228 {undefined, undefined} -> dec_huffman(R, Len - 1, Huff, Acc); 229 {CharA, undefined} -> dec_huffman(R, Len - 1, Huff, <<Acc/binary, CharA>>); 230 {undefined, CharB} -> dec_huffman(R, Len - 1, Huff, <<Acc/binary, CharB>>); 231 {CharA, CharB} -> dec_huffman(R, Len - 1, Huff, <<Acc/binary, CharA, CharB>>) 232 end; 233dec_huffman(<<A:4, B:4, Rest/bits>>, 1, Huff0, Acc) -> 234 {_, CharA, Huff} = dec_huffman_lookup(Huff0, A), 235 {ok, CharB, _} = dec_huffman_lookup(Huff, B), 236 case {CharA, CharB} of 237 %% {undefined, undefined} (> 7-bit final padding) is rejected with a crash. 238 {CharA, undefined} -> 239 {<<Acc/binary, CharA>>, Rest}; 240 {undefined, CharB} -> 241 {<<Acc/binary, CharB>>, Rest}; 242 _ -> 243 {<<Acc/binary, CharA, CharB>>, Rest} 244 end; 245%% Can only be reached when the string length to decode is 0. 246dec_huffman(Rest, 0, _, <<>>) -> 247 {<<>>, Rest}. 248 249-include("cow_hpack_dec_huffman_lookup.hrl"). 250 251-ifdef(TEST). 252%% Test case extracted from h2spec. 253decode_reject_eos_test() -> 254 {'EXIT', _} = (catch decode(<<16#0085f2b24a84ff874951fffffffa7f:120>>)), 255 ok. 256 257req_decode_test() -> 258 %% First request (raw then huffman). 259 {Headers1, State1} = decode(<< 16#828684410f7777772e6578616d706c652e636f6d:160 >>), 260 {Headers1, State1} = decode(<< 16#828684418cf1e3c2e5f23a6ba0ab90f4ff:136 >>), 261 Headers1 = [ 262 {<<":method">>, <<"GET">>}, 263 {<<":scheme">>, <<"http">>}, 264 {<<":path">>, <<"/">>}, 265 {<<":authority">>, <<"www.example.com">>} 266 ], 267 #state{size=57, dyn_table=[{57,{<<":authority">>, <<"www.example.com">>}}]} = State1, 268 %% Second request (raw then huffman). 269 {Headers2, State2} = decode(<< 16#828684be58086e6f2d6361636865:112 >>, State1), 270 {Headers2, State2} = decode(<< 16#828684be5886a8eb10649cbf:96 >>, State1), 271 Headers2 = [ 272 {<<":method">>, <<"GET">>}, 273 {<<":scheme">>, <<"http">>}, 274 {<<":path">>, <<"/">>}, 275 {<<":authority">>, <<"www.example.com">>}, 276 {<<"cache-control">>, <<"no-cache">>} 277 ], 278 #state{size=110, dyn_table=[ 279 {53,{<<"cache-control">>, <<"no-cache">>}}, 280 {57,{<<":authority">>, <<"www.example.com">>}}]} = State2, 281 %% Third request (raw then huffman). 282 {Headers3, State3} = decode(<< 16#828785bf400a637573746f6d2d6b65790c637573746f6d2d76616c7565:232 >>, State2), 283 {Headers3, State3} = decode(<< 16#828785bf408825a849e95ba97d7f8925a849e95bb8e8b4bf:192 >>, State2), 284 Headers3 = [ 285 {<<":method">>, <<"GET">>}, 286 {<<":scheme">>, <<"https">>}, 287 {<<":path">>, <<"/index.html">>}, 288 {<<":authority">>, <<"www.example.com">>}, 289 {<<"custom-key">>, <<"custom-value">>} 290 ], 291 #state{size=164, dyn_table=[ 292 {54,{<<"custom-key">>, <<"custom-value">>}}, 293 {53,{<<"cache-control">>, <<"no-cache">>}}, 294 {57,{<<":authority">>, <<"www.example.com">>}}]} = State3, 295 ok. 296 297resp_decode_test() -> 298 %% Use a max_size of 256 to trigger header evictions. 299 State0 = init(256), 300 %% First response (raw then huffman). 301 {Headers1, State1} = decode(<< 16#4803333032580770726976617465611d4d6f6e2c203231204f637420323031332032303a31333a323120474d546e1768747470733a2f2f7777772e6578616d706c652e636f6d:560 >>, State0), 302 {Headers1, State1} = decode(<< 16#488264025885aec3771a4b6196d07abe941054d444a8200595040b8166e082a62d1bff6e919d29ad171863c78f0b97c8e9ae82ae43d3:432 >>, State0), 303 Headers1 = [ 304 {<<":status">>, <<"302">>}, 305 {<<"cache-control">>, <<"private">>}, 306 {<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}, 307 {<<"location">>, <<"https://www.example.com">>} 308 ], 309 #state{size=222, dyn_table=[ 310 {63,{<<"location">>, <<"https://www.example.com">>}}, 311 {65,{<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}}, 312 {52,{<<"cache-control">>, <<"private">>}}, 313 {42,{<<":status">>, <<"302">>}}]} = State1, 314 %% Second response (raw then huffman). 315 {Headers2, State2} = decode(<< 16#4803333037c1c0bf:64 >>, State1), 316 {Headers2, State2} = decode(<< 16#4883640effc1c0bf:64 >>, State1), 317 Headers2 = [ 318 {<<":status">>, <<"307">>}, 319 {<<"cache-control">>, <<"private">>}, 320 {<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}, 321 {<<"location">>, <<"https://www.example.com">>} 322 ], 323 #state{size=222, dyn_table=[ 324 {42,{<<":status">>, <<"307">>}}, 325 {63,{<<"location">>, <<"https://www.example.com">>}}, 326 {65,{<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}}, 327 {52,{<<"cache-control">>, <<"private">>}}]} = State2, 328 %% Third response (raw then huffman). 329 {Headers3, State3} = decode(<< 16#88c1611d4d6f6e2c203231204f637420323031332032303a31333a323220474d54c05a04677a69707738666f6f3d4153444a4b48514b425a584f5157454f50495541585157454f49553b206d61782d6167653d333630303b2076657273696f6e3d31:784 >>, State2), 330 {Headers3, State3} = decode(<< 16#88c16196d07abe941054d444a8200595040b8166e084a62d1bffc05a839bd9ab77ad94e7821dd7f2e6c7b335dfdfcd5b3960d5af27087f3672c1ab270fb5291f9587316065c003ed4ee5b1063d5007:632 >>, State2), 331 Headers3 = [ 332 {<<":status">>, <<"200">>}, 333 {<<"cache-control">>, <<"private">>}, 334 {<<"date">>, <<"Mon, 21 Oct 2013 20:13:22 GMT">>}, 335 {<<"location">>, <<"https://www.example.com">>}, 336 {<<"content-encoding">>, <<"gzip">>}, 337 {<<"set-cookie">>, <<"foo=ASDJKHQKBZXOQWEOPIUAXQWEOIU; max-age=3600; version=1">>} 338 ], 339 #state{size=215, dyn_table=[ 340 {98,{<<"set-cookie">>, <<"foo=ASDJKHQKBZXOQWEOPIUAXQWEOIU; max-age=3600; version=1">>}}, 341 {52,{<<"content-encoding">>, <<"gzip">>}}, 342 {65,{<<"date">>, <<"Mon, 21 Oct 2013 20:13:22 GMT">>}}]} = State3, 343 ok. 344 345table_update_decode_test() -> 346 %% Use a max_size of 256 to trigger header evictions 347 %% when the code is not updating the max size. 348 State0 = init(256), 349 %% First response (raw then huffman). 350 {Headers1, State1} = decode(<< 16#4803333032580770726976617465611d4d6f6e2c203231204f637420323031332032303a31333a323120474d546e1768747470733a2f2f7777772e6578616d706c652e636f6d:560 >>, State0), 351 {Headers1, State1} = decode(<< 16#488264025885aec3771a4b6196d07abe941054d444a8200595040b8166e082a62d1bff6e919d29ad171863c78f0b97c8e9ae82ae43d3:432 >>, State0), 352 Headers1 = [ 353 {<<":status">>, <<"302">>}, 354 {<<"cache-control">>, <<"private">>}, 355 {<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}, 356 {<<"location">>, <<"https://www.example.com">>} 357 ], 358 #state{size=222, configured_max_size=256, dyn_table=[ 359 {63,{<<"location">>, <<"https://www.example.com">>}}, 360 {65,{<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}}, 361 {52,{<<"cache-control">>, <<"private">>}}, 362 {42,{<<":status">>, <<"302">>}}]} = State1, 363 %% Set a new configured max_size to avoid header evictions. 364 State2 = set_max_size(512, State1), 365 %% Second response with the table size update (raw then huffman). 366 MaxSize = enc_big_int(512 - 31, <<>>), 367 {Headers2, State3} = decode( 368 iolist_to_binary([<< 2#00111111>>, MaxSize, <<16#4803333037c1c0bf:64>>]), 369 State2), 370 {Headers2, State3} = decode( 371 iolist_to_binary([<< 2#00111111>>, MaxSize, <<16#4883640effc1c0bf:64>>]), 372 State2), 373 Headers2 = [ 374 {<<":status">>, <<"307">>}, 375 {<<"cache-control">>, <<"private">>}, 376 {<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}, 377 {<<"location">>, <<"https://www.example.com">>} 378 ], 379 #state{size=264, configured_max_size=512, dyn_table=[ 380 {42,{<<":status">>, <<"307">>}}, 381 {63,{<<"location">>, <<"https://www.example.com">>}}, 382 {65,{<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}}, 383 {52,{<<"cache-control">>, <<"private">>}}, 384 {42,{<<":status">>, <<"302">>}}]} = State3, 385 ok. 386 387table_update_decode_smaller_test() -> 388 %% Use a max_size of 256 to trigger header evictions 389 %% when the code is not updating the max size. 390 State0 = init(256), 391 %% First response (raw then huffman). 392 {Headers1, State1} = decode(<< 16#4803333032580770726976617465611d4d6f6e2c203231204f637420323031332032303a31333a323120474d546e1768747470733a2f2f7777772e6578616d706c652e636f6d:560 >>, State0), 393 {Headers1, State1} = decode(<< 16#488264025885aec3771a4b6196d07abe941054d444a8200595040b8166e082a62d1bff6e919d29ad171863c78f0b97c8e9ae82ae43d3:432 >>, State0), 394 Headers1 = [ 395 {<<":status">>, <<"302">>}, 396 {<<"cache-control">>, <<"private">>}, 397 {<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}, 398 {<<"location">>, <<"https://www.example.com">>} 399 ], 400 #state{size=222, configured_max_size=256, dyn_table=[ 401 {63,{<<"location">>, <<"https://www.example.com">>}}, 402 {65,{<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}}, 403 {52,{<<"cache-control">>, <<"private">>}}, 404 {42,{<<":status">>, <<"302">>}}]} = State1, 405 %% Set a new configured max_size to avoid header evictions. 406 State2 = set_max_size(512, State1), 407 %% Second response with the table size update smaller than the limit (raw then huffman). 408 MaxSize = enc_big_int(400 - 31, <<>>), 409 {Headers2, State3} = decode( 410 iolist_to_binary([<< 2#00111111>>, MaxSize, <<16#4803333037c1c0bf:64>>]), 411 State2), 412 {Headers2, State3} = decode( 413 iolist_to_binary([<< 2#00111111>>, MaxSize, <<16#4883640effc1c0bf:64>>]), 414 State2), 415 Headers2 = [ 416 {<<":status">>, <<"307">>}, 417 {<<"cache-control">>, <<"private">>}, 418 {<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}, 419 {<<"location">>, <<"https://www.example.com">>} 420 ], 421 #state{size=264, configured_max_size=512, dyn_table=[ 422 {42,{<<":status">>, <<"307">>}}, 423 {63,{<<"location">>, <<"https://www.example.com">>}}, 424 {65,{<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}}, 425 {52,{<<"cache-control">>, <<"private">>}}, 426 {42,{<<":status">>, <<"302">>}}]} = State3, 427 ok. 428 429table_update_decode_too_large_test() -> 430 %% Use a max_size of 256 to trigger header evictions 431 %% when the code is not updating the max size. 432 State0 = init(256), 433 %% First response (raw then huffman). 434 {Headers1, State1} = decode(<< 16#4803333032580770726976617465611d4d6f6e2c203231204f637420323031332032303a31333a323120474d546e1768747470733a2f2f7777772e6578616d706c652e636f6d:560 >>, State0), 435 {Headers1, State1} = decode(<< 16#488264025885aec3771a4b6196d07abe941054d444a8200595040b8166e082a62d1bff6e919d29ad171863c78f0b97c8e9ae82ae43d3:432 >>, State0), 436 Headers1 = [ 437 {<<":status">>, <<"302">>}, 438 {<<"cache-control">>, <<"private">>}, 439 {<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}, 440 {<<"location">>, <<"https://www.example.com">>} 441 ], 442 #state{size=222, configured_max_size=256, dyn_table=[ 443 {63,{<<"location">>, <<"https://www.example.com">>}}, 444 {65,{<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}}, 445 {52,{<<"cache-control">>, <<"private">>}}, 446 {42,{<<":status">>, <<"302">>}}]} = State1, 447 %% Set a new configured max_size to avoid header evictions. 448 State2 = set_max_size(512, State1), 449 %% Second response with the table size update (raw then huffman). 450 MaxSize = enc_big_int(1024 - 31, <<>>), 451 {'EXIT', _} = (catch decode( 452 iolist_to_binary([<< 2#00111111>>, MaxSize, <<16#4803333037c1c0bf:64>>]), 453 State2)), 454 {'EXIT', _} = (catch decode( 455 iolist_to_binary([<< 2#00111111>>, MaxSize, <<16#4883640effc1c0bf:64>>]), 456 State2)), 457 ok. 458 459table_update_decode_zero_test() -> 460 State0 = init(256), 461 %% First response (raw then huffman). 462 {Headers1, State1} = decode(<< 16#4803333032580770726976617465611d4d6f6e2c203231204f637420323031332032303a31333a323120474d546e1768747470733a2f2f7777772e6578616d706c652e636f6d:560 >>, State0), 463 {Headers1, State1} = decode(<< 16#488264025885aec3771a4b6196d07abe941054d444a8200595040b8166e082a62d1bff6e919d29ad171863c78f0b97c8e9ae82ae43d3:432 >>, State0), 464 Headers1 = [ 465 {<<":status">>, <<"302">>}, 466 {<<"cache-control">>, <<"private">>}, 467 {<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}, 468 {<<"location">>, <<"https://www.example.com">>} 469 ], 470 #state{size=222, configured_max_size=256, dyn_table=[ 471 {63,{<<"location">>, <<"https://www.example.com">>}}, 472 {65,{<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}}, 473 {52,{<<"cache-control">>, <<"private">>}}, 474 {42,{<<":status">>, <<"302">>}}]} = State1, 475 %% Set a new configured max_size to avoid header evictions. 476 State2 = set_max_size(512, State1), 477 %% Second response with the table size update (raw then huffman). 478 %% We set the table size to 0 to evict all values before setting 479 %% it to 512 so we only get the second request indexed. 480 MaxSize = enc_big_int(512 - 31, <<>>), 481 {Headers1, State3} = decode(iolist_to_binary([ 482 <<2#00100000, 2#00111111>>, MaxSize, 483 <<16#4803333032580770726976617465611d4d6f6e2c203231204f637420323031332032303a31333a323120474d546e1768747470733a2f2f7777772e6578616d706c652e636f6d:560>>]), 484 State2), 485 {Headers1, State3} = decode(iolist_to_binary([ 486 <<2#00100000, 2#00111111>>, MaxSize, 487 <<16#488264025885aec3771a4b6196d07abe941054d444a8200595040b8166e082a62d1bff6e919d29ad171863c78f0b97c8e9ae82ae43d3:432>>]), 488 State2), 489 #state{size=222, configured_max_size=512, dyn_table=[ 490 {63,{<<"location">>, <<"https://www.example.com">>}}, 491 {65,{<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}}, 492 {52,{<<"cache-control">>, <<"private">>}}, 493 {42,{<<":status">>, <<"302">>}}]} = State3, 494 ok. 495 496horse_decode_raw() -> 497 horse:repeat(20000, 498 do_horse_decode_raw() 499 ). 500 501do_horse_decode_raw() -> 502 {_, State1} = decode(<<16#828684410f7777772e6578616d706c652e636f6d:160>>), 503 {_, State2} = decode(<<16#828684be58086e6f2d6361636865:112>>, State1), 504 {_, _} = decode(<<16#828785bf400a637573746f6d2d6b65790c637573746f6d2d76616c7565:232>>, State2), 505 ok. 506 507horse_decode_huffman() -> 508 horse:repeat(20000, 509 do_horse_decode_huffman() 510 ). 511 512do_horse_decode_huffman() -> 513 {_, State1} = decode(<<16#828684418cf1e3c2e5f23a6ba0ab90f4ff:136>>), 514 {_, State2} = decode(<<16#828684be5886a8eb10649cbf:96>>, State1), 515 {_, _} = decode(<<16#828785bf408825a849e95ba97d7f8925a849e95bb8e8b4bf:192>>, State2), 516 ok. 517-endif. 518 519%% Encoding. 520 521-spec encode(cow_http:headers()) -> {iodata(), state()}. 522encode(Headers) -> 523 encode(Headers, init(), huffman, []). 524 525-spec encode(cow_http:headers(), State) -> {iodata(), State} when State::state(). 526encode(Headers, State=#state{max_size=MaxSize, configured_max_size=MaxSize}) -> 527 encode(Headers, State, huffman, []); 528encode(Headers, State0=#state{configured_max_size=MaxSize}) -> 529 {Data, State} = encode(Headers, State0#state{max_size=MaxSize}, huffman, []), 530 {[enc_int5(MaxSize, 2#001)|Data], State}. 531 532-spec encode(cow_http:headers(), State, opts()) -> {iodata(), State} when State::state(). 533encode(Headers, State=#state{max_size=MaxSize, configured_max_size=MaxSize}, Opts) -> 534 encode(Headers, State, huffman_opt(Opts), []); 535encode(Headers, State0=#state{configured_max_size=MaxSize}, Opts) -> 536 {Data, State} = encode(Headers, State0#state{max_size=MaxSize}, huffman_opt(Opts), []), 537 {[enc_int5(MaxSize, 2#001)|Data], State}. 538 539huffman_opt(#{huffman := false}) -> no_huffman; 540huffman_opt(_) -> huffman. 541 542%% @todo Handle cases where no/never indexing is expected. 543encode([], State, _, Acc) -> 544 {lists:reverse(Acc), State}; 545encode([{Name, Value0}|Tail], State, HuffmanOpt, Acc) -> 546 %% We conditionally call iolist_to_binary/1 because a small 547 %% but noticeable speed improvement happens when we do this. 548 Value = if 549 is_binary(Value0) -> Value0; 550 true -> iolist_to_binary(Value0) 551 end, 552 Header = {Name, Value}, 553 case table_find(Header, State) of 554 %% Indexed header field representation. 555 {field, Index} -> 556 encode(Tail, State, HuffmanOpt, 557 [enc_int7(Index, 2#1)|Acc]); 558 %% Literal header field representation: indexed name. 559 {name, Index} -> 560 State2 = table_insert(Header, State), 561 encode(Tail, State2, HuffmanOpt, 562 [[enc_int6(Index, 2#01)|enc_str(Value, HuffmanOpt)]|Acc]); 563 %% Literal header field representation: new name. 564 not_found -> 565 State2 = table_insert(Header, State), 566 encode(Tail, State2, HuffmanOpt, 567 [[<< 0:1, 1:1, 0:6 >>|[enc_str(Name, HuffmanOpt)|enc_str(Value, HuffmanOpt)]]|Acc]) 568 end. 569 570%% Encode an integer. 571 572enc_int5(Int, Prefix) when Int < 31 -> 573 << Prefix:3, Int:5 >>; 574enc_int5(Int, Prefix) -> 575 enc_big_int(Int - 31, << Prefix:3, 2#11111:5 >>). 576 577enc_int6(Int, Prefix) when Int < 63 -> 578 << Prefix:2, Int:6 >>; 579enc_int6(Int, Prefix) -> 580 enc_big_int(Int - 63, << Prefix:2, 2#111111:6 >>). 581 582enc_int7(Int, Prefix) when Int < 127 -> 583 << Prefix:1, Int:7 >>; 584enc_int7(Int, Prefix) -> 585 enc_big_int(Int - 127, << Prefix:1, 2#1111111:7 >>). 586 587enc_big_int(Int, Acc) when Int < 128 -> 588 <<Acc/binary, Int:8>>; 589enc_big_int(Int, Acc) -> 590 enc_big_int(Int bsr 7, <<Acc/binary, 1:1, Int:7>>). 591 592%% Encode a string. 593 594enc_str(Str, huffman) -> 595 Str2 = enc_huffman(Str, <<>>), 596 [enc_int7(byte_size(Str2), 2#1)|Str2]; 597enc_str(Str, no_huffman) -> 598 [enc_int7(byte_size(Str), 2#0)|Str]. 599 600enc_huffman(<<>>, Acc) -> 601 case bit_size(Acc) rem 8 of 602 1 -> << Acc/bits, 2#1111111:7 >>; 603 2 -> << Acc/bits, 2#111111:6 >>; 604 3 -> << Acc/bits, 2#11111:5 >>; 605 4 -> << Acc/bits, 2#1111:4 >>; 606 5 -> << Acc/bits, 2#111:3 >>; 607 6 -> << Acc/bits, 2#11:2 >>; 608 7 -> << Acc/bits, 2#1:1 >>; 609 0 -> Acc 610 end; 611enc_huffman(<< 0, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111000:13 >>); 612enc_huffman(<< 1, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111011000:23 >>); 613enc_huffman(<< 2, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111100010:28 >>); 614enc_huffman(<< 3, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111100011:28 >>); 615enc_huffman(<< 4, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111100100:28 >>); 616enc_huffman(<< 5, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111100101:28 >>); 617enc_huffman(<< 6, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111100110:28 >>); 618enc_huffman(<< 7, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111100111:28 >>); 619enc_huffman(<< 8, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111101000:28 >>); 620enc_huffman(<< 9, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111101010:24 >>); 621enc_huffman(<< 10, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111111111111100:30 >>); 622enc_huffman(<< 11, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111101001:28 >>); 623enc_huffman(<< 12, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111101010:28 >>); 624enc_huffman(<< 13, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111111111111101:30 >>); 625enc_huffman(<< 14, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111101011:28 >>); 626enc_huffman(<< 15, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111101100:28 >>); 627enc_huffman(<< 16, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111101101:28 >>); 628enc_huffman(<< 17, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111101110:28 >>); 629enc_huffman(<< 18, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111101111:28 >>); 630enc_huffman(<< 19, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111110000:28 >>); 631enc_huffman(<< 20, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111110001:28 >>); 632enc_huffman(<< 21, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111110010:28 >>); 633enc_huffman(<< 22, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111111111111110:30 >>); 634enc_huffman(<< 23, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111110011:28 >>); 635enc_huffman(<< 24, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111110100:28 >>); 636enc_huffman(<< 25, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111110101:28 >>); 637enc_huffman(<< 26, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111110110:28 >>); 638enc_huffman(<< 27, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111110111:28 >>); 639enc_huffman(<< 28, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111111000:28 >>); 640enc_huffman(<< 29, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111111001:28 >>); 641enc_huffman(<< 30, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111111010:28 >>); 642enc_huffman(<< 31, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111111011:28 >>); 643enc_huffman(<< 32, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#010100:6 >>); 644enc_huffman(<< 33, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111000:10 >>); 645enc_huffman(<< 34, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111001:10 >>); 646enc_huffman(<< 35, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111010:12 >>); 647enc_huffman(<< 36, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111001:13 >>); 648enc_huffman(<< 37, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#010101:6 >>); 649enc_huffman(<< 38, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111000:8 >>); 650enc_huffman(<< 39, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111010:11 >>); 651enc_huffman(<< 40, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111010:10 >>); 652enc_huffman(<< 41, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111011:10 >>); 653enc_huffman(<< 42, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111001:8 >>); 654enc_huffman(<< 43, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111011:11 >>); 655enc_huffman(<< 44, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111010:8 >>); 656enc_huffman(<< 45, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#010110:6 >>); 657enc_huffman(<< 46, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#010111:6 >>); 658enc_huffman(<< 47, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#011000:6 >>); 659enc_huffman(<< 48, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#00000:5 >>); 660enc_huffman(<< 49, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#00001:5 >>); 661enc_huffman(<< 50, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#00010:5 >>); 662enc_huffman(<< 51, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#011001:6 >>); 663enc_huffman(<< 52, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#011010:6 >>); 664enc_huffman(<< 53, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#011011:6 >>); 665enc_huffman(<< 54, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#011100:6 >>); 666enc_huffman(<< 55, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#011101:6 >>); 667enc_huffman(<< 56, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#011110:6 >>); 668enc_huffman(<< 57, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#011111:6 >>); 669enc_huffman(<< 58, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1011100:7 >>); 670enc_huffman(<< 59, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111011:8 >>); 671enc_huffman(<< 60, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111100:15 >>); 672enc_huffman(<< 61, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#100000:6 >>); 673enc_huffman(<< 62, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111011:12 >>); 674enc_huffman(<< 63, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111100:10 >>); 675enc_huffman(<< 64, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111010:13 >>); 676enc_huffman(<< 65, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#100001:6 >>); 677enc_huffman(<< 66, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1011101:7 >>); 678enc_huffman(<< 67, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1011110:7 >>); 679enc_huffman(<< 68, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1011111:7 >>); 680enc_huffman(<< 69, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1100000:7 >>); 681enc_huffman(<< 70, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1100001:7 >>); 682enc_huffman(<< 71, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1100010:7 >>); 683enc_huffman(<< 72, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1100011:7 >>); 684enc_huffman(<< 73, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1100100:7 >>); 685enc_huffman(<< 74, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1100101:7 >>); 686enc_huffman(<< 75, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1100110:7 >>); 687enc_huffman(<< 76, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1100111:7 >>); 688enc_huffman(<< 77, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1101000:7 >>); 689enc_huffman(<< 78, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1101001:7 >>); 690enc_huffman(<< 79, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1101010:7 >>); 691enc_huffman(<< 80, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1101011:7 >>); 692enc_huffman(<< 81, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1101100:7 >>); 693enc_huffman(<< 82, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1101101:7 >>); 694enc_huffman(<< 83, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1101110:7 >>); 695enc_huffman(<< 84, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1101111:7 >>); 696enc_huffman(<< 85, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1110000:7 >>); 697enc_huffman(<< 86, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1110001:7 >>); 698enc_huffman(<< 87, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1110010:7 >>); 699enc_huffman(<< 88, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111100:8 >>); 700enc_huffman(<< 89, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1110011:7 >>); 701enc_huffman(<< 90, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111101:8 >>); 702enc_huffman(<< 91, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111011:13 >>); 703enc_huffman(<< 92, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111110000:19 >>); 704enc_huffman(<< 93, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111100:13 >>); 705enc_huffman(<< 94, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111100:14 >>); 706enc_huffman(<< 95, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#100010:6 >>); 707enc_huffman(<< 96, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111101:15 >>); 708enc_huffman(<< 97, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#00011:5 >>); 709enc_huffman(<< 98, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#100011:6 >>); 710enc_huffman(<< 99, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#00100:5 >>); 711enc_huffman(<< 100, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#100100:6 >>); 712enc_huffman(<< 101, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#00101:5 >>); 713enc_huffman(<< 102, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#100101:6 >>); 714enc_huffman(<< 103, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#100110:6 >>); 715enc_huffman(<< 104, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#100111:6 >>); 716enc_huffman(<< 105, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#00110:5 >>); 717enc_huffman(<< 106, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1110100:7 >>); 718enc_huffman(<< 107, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1110101:7 >>); 719enc_huffman(<< 108, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#101000:6 >>); 720enc_huffman(<< 109, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#101001:6 >>); 721enc_huffman(<< 110, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#101010:6 >>); 722enc_huffman(<< 111, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#00111:5 >>); 723enc_huffman(<< 112, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#101011:6 >>); 724enc_huffman(<< 113, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1110110:7 >>); 725enc_huffman(<< 114, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#101100:6 >>); 726enc_huffman(<< 115, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#01000:5 >>); 727enc_huffman(<< 116, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#01001:5 >>); 728enc_huffman(<< 117, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#101101:6 >>); 729enc_huffman(<< 118, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1110111:7 >>); 730enc_huffman(<< 119, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111000:7 >>); 731enc_huffman(<< 120, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111001:7 >>); 732enc_huffman(<< 121, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111010:7 >>); 733enc_huffman(<< 122, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111011:7 >>); 734enc_huffman(<< 123, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111110:15 >>); 735enc_huffman(<< 124, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111100:11 >>); 736enc_huffman(<< 125, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111101:14 >>); 737enc_huffman(<< 126, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111101:13 >>); 738enc_huffman(<< 127, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111111100:28 >>); 739enc_huffman(<< 128, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111100110:20 >>); 740enc_huffman(<< 129, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111010010:22 >>); 741enc_huffman(<< 130, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111100111:20 >>); 742enc_huffman(<< 131, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111101000:20 >>); 743enc_huffman(<< 132, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111010011:22 >>); 744enc_huffman(<< 133, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111010100:22 >>); 745enc_huffman(<< 134, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111010101:22 >>); 746enc_huffman(<< 135, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111011001:23 >>); 747enc_huffman(<< 136, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111010110:22 >>); 748enc_huffman(<< 137, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111011010:23 >>); 749enc_huffman(<< 138, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111011011:23 >>); 750enc_huffman(<< 139, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111011100:23 >>); 751enc_huffman(<< 140, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111011101:23 >>); 752enc_huffman(<< 141, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111011110:23 >>); 753enc_huffman(<< 142, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111101011:24 >>); 754enc_huffman(<< 143, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111011111:23 >>); 755enc_huffman(<< 144, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111101100:24 >>); 756enc_huffman(<< 145, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111101101:24 >>); 757enc_huffman(<< 146, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111010111:22 >>); 758enc_huffman(<< 147, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111100000:23 >>); 759enc_huffman(<< 148, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111101110:24 >>); 760enc_huffman(<< 149, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111100001:23 >>); 761enc_huffman(<< 150, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111100010:23 >>); 762enc_huffman(<< 151, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111100011:23 >>); 763enc_huffman(<< 152, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111100100:23 >>); 764enc_huffman(<< 153, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111011100:21 >>); 765enc_huffman(<< 154, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111011000:22 >>); 766enc_huffman(<< 155, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111100101:23 >>); 767enc_huffman(<< 156, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111011001:22 >>); 768enc_huffman(<< 157, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111100110:23 >>); 769enc_huffman(<< 158, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111100111:23 >>); 770enc_huffman(<< 159, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111101111:24 >>); 771enc_huffman(<< 160, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111011010:22 >>); 772enc_huffman(<< 161, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111011101:21 >>); 773enc_huffman(<< 162, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111101001:20 >>); 774enc_huffman(<< 163, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111011011:22 >>); 775enc_huffman(<< 164, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111011100:22 >>); 776enc_huffman(<< 165, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111101000:23 >>); 777enc_huffman(<< 166, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111101001:23 >>); 778enc_huffman(<< 167, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111011110:21 >>); 779enc_huffman(<< 168, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111101010:23 >>); 780enc_huffman(<< 169, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111011101:22 >>); 781enc_huffman(<< 170, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111011110:22 >>); 782enc_huffman(<< 171, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111110000:24 >>); 783enc_huffman(<< 172, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111011111:21 >>); 784enc_huffman(<< 173, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111011111:22 >>); 785enc_huffman(<< 174, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111101011:23 >>); 786enc_huffman(<< 175, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111101100:23 >>); 787enc_huffman(<< 176, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111100000:21 >>); 788enc_huffman(<< 177, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111100001:21 >>); 789enc_huffman(<< 178, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111100000:22 >>); 790enc_huffman(<< 179, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111100010:21 >>); 791enc_huffman(<< 180, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111101101:23 >>); 792enc_huffman(<< 181, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111100001:22 >>); 793enc_huffman(<< 182, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111101110:23 >>); 794enc_huffman(<< 183, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111101111:23 >>); 795enc_huffman(<< 184, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111101010:20 >>); 796enc_huffman(<< 185, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111100010:22 >>); 797enc_huffman(<< 186, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111100011:22 >>); 798enc_huffman(<< 187, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111100100:22 >>); 799enc_huffman(<< 188, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111110000:23 >>); 800enc_huffman(<< 189, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111100101:22 >>); 801enc_huffman(<< 190, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111100110:22 >>); 802enc_huffman(<< 191, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111110001:23 >>); 803enc_huffman(<< 192, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111111100000:26 >>); 804enc_huffman(<< 193, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111111100001:26 >>); 805enc_huffman(<< 194, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111101011:20 >>); 806enc_huffman(<< 195, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111110001:19 >>); 807enc_huffman(<< 196, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111100111:22 >>); 808enc_huffman(<< 197, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111110010:23 >>); 809enc_huffman(<< 198, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111101000:22 >>); 810enc_huffman(<< 199, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111101100:25 >>); 811enc_huffman(<< 200, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111111100010:26 >>); 812enc_huffman(<< 201, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111111100011:26 >>); 813enc_huffman(<< 202, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111111100100:26 >>); 814enc_huffman(<< 203, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111111011110:27 >>); 815enc_huffman(<< 204, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111111011111:27 >>); 816enc_huffman(<< 205, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111111100101:26 >>); 817enc_huffman(<< 206, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111110001:24 >>); 818enc_huffman(<< 207, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111101101:25 >>); 819enc_huffman(<< 208, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111110010:19 >>); 820enc_huffman(<< 209, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111100011:21 >>); 821enc_huffman(<< 210, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111111100110:26 >>); 822enc_huffman(<< 211, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111111100000:27 >>); 823enc_huffman(<< 212, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111111100001:27 >>); 824enc_huffman(<< 213, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111111100111:26 >>); 825enc_huffman(<< 214, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111111100010:27 >>); 826enc_huffman(<< 215, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111110010:24 >>); 827enc_huffman(<< 216, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111100100:21 >>); 828enc_huffman(<< 217, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111100101:21 >>); 829enc_huffman(<< 218, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111111101000:26 >>); 830enc_huffman(<< 219, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111111101001:26 >>); 831enc_huffman(<< 220, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111111101:28 >>); 832enc_huffman(<< 221, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111111100011:27 >>); 833enc_huffman(<< 222, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111111100100:27 >>); 834enc_huffman(<< 223, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111111100101:27 >>); 835enc_huffman(<< 224, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111101100:20 >>); 836enc_huffman(<< 225, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111110011:24 >>); 837enc_huffman(<< 226, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111101101:20 >>); 838enc_huffman(<< 227, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111100110:21 >>); 839enc_huffman(<< 228, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111101001:22 >>); 840enc_huffman(<< 229, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111100111:21 >>); 841enc_huffman(<< 230, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111101000:21 >>); 842enc_huffman(<< 231, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111110011:23 >>); 843enc_huffman(<< 232, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111101010:22 >>); 844enc_huffman(<< 233, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111101011:22 >>); 845enc_huffman(<< 234, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111101110:25 >>); 846enc_huffman(<< 235, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111101111:25 >>); 847enc_huffman(<< 236, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111110100:24 >>); 848enc_huffman(<< 237, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111110101:24 >>); 849enc_huffman(<< 238, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111111101010:26 >>); 850enc_huffman(<< 239, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111110100:23 >>); 851enc_huffman(<< 240, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111111101011:26 >>); 852enc_huffman(<< 241, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111111100110:27 >>); 853enc_huffman(<< 242, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111111101100:26 >>); 854enc_huffman(<< 243, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111111101101:26 >>); 855enc_huffman(<< 244, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111111100111:27 >>); 856enc_huffman(<< 245, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111111101000:27 >>); 857enc_huffman(<< 246, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111111101001:27 >>); 858enc_huffman(<< 247, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111111101010:27 >>); 859enc_huffman(<< 248, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111111101011:27 >>); 860enc_huffman(<< 249, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#1111111111111111111111111110:28 >>); 861enc_huffman(<< 250, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111111101100:27 >>); 862enc_huffman(<< 251, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111111101101:27 >>); 863enc_huffman(<< 252, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111111101110:27 >>); 864enc_huffman(<< 253, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111111101111:27 >>); 865enc_huffman(<< 254, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#111111111111111111111110000:27 >>); 866enc_huffman(<< 255, R/bits >>, A) -> enc_huffman(R, << A/bits, 2#11111111111111111111101110:26 >>). 867 868-ifdef(TEST). 869req_encode_test() -> 870 %% First request (raw then huffman). 871 Headers1 = [ 872 {<<":method">>, <<"GET">>}, 873 {<<":scheme">>, <<"http">>}, 874 {<<":path">>, <<"/">>}, 875 {<<":authority">>, <<"www.example.com">>} 876 ], 877 {Raw1, State1} = encode(Headers1, init(), #{huffman => false}), 878 << 16#828684410f7777772e6578616d706c652e636f6d:160 >> = iolist_to_binary(Raw1), 879 {Huff1, State1} = encode(Headers1), 880 << 16#828684418cf1e3c2e5f23a6ba0ab90f4ff:136 >> = iolist_to_binary(Huff1), 881 #state{size=57, dyn_table=[{57,{<<":authority">>, <<"www.example.com">>}}]} = State1, 882 %% Second request (raw then huffman). 883 Headers2 = [ 884 {<<":method">>, <<"GET">>}, 885 {<<":scheme">>, <<"http">>}, 886 {<<":path">>, <<"/">>}, 887 {<<":authority">>, <<"www.example.com">>}, 888 {<<"cache-control">>, <<"no-cache">>} 889 ], 890 {Raw2, State2} = encode(Headers2, State1, #{huffman => false}), 891 << 16#828684be58086e6f2d6361636865:112 >> = iolist_to_binary(Raw2), 892 {Huff2, State2} = encode(Headers2, State1), 893 << 16#828684be5886a8eb10649cbf:96 >> = iolist_to_binary(Huff2), 894 #state{size=110, dyn_table=[ 895 {53,{<<"cache-control">>, <<"no-cache">>}}, 896 {57,{<<":authority">>, <<"www.example.com">>}}]} = State2, 897 %% Third request (raw then huffman). 898 Headers3 = [ 899 {<<":method">>, <<"GET">>}, 900 {<<":scheme">>, <<"https">>}, 901 {<<":path">>, <<"/index.html">>}, 902 {<<":authority">>, <<"www.example.com">>}, 903 {<<"custom-key">>, <<"custom-value">>} 904 ], 905 {Raw3, State3} = encode(Headers3, State2, #{huffman => false}), 906 << 16#828785bf400a637573746f6d2d6b65790c637573746f6d2d76616c7565:232 >> = iolist_to_binary(Raw3), 907 {Huff3, State3} = encode(Headers3, State2), 908 << 16#828785bf408825a849e95ba97d7f8925a849e95bb8e8b4bf:192 >> = iolist_to_binary(Huff3), 909 #state{size=164, dyn_table=[ 910 {54,{<<"custom-key">>, <<"custom-value">>}}, 911 {53,{<<"cache-control">>, <<"no-cache">>}}, 912 {57,{<<":authority">>, <<"www.example.com">>}}]} = State3, 913 ok. 914 915resp_encode_test() -> 916 %% Use a max_size of 256 to trigger header evictions. 917 State0 = init(256), 918 %% First response (raw then huffman). 919 Headers1 = [ 920 {<<":status">>, <<"302">>}, 921 {<<"cache-control">>, <<"private">>}, 922 {<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}, 923 {<<"location">>, <<"https://www.example.com">>} 924 ], 925 {Raw1, State1} = encode(Headers1, State0, #{huffman => false}), 926 << 16#4803333032580770726976617465611d4d6f6e2c203231204f637420323031332032303a31333a323120474d546e1768747470733a2f2f7777772e6578616d706c652e636f6d:560 >> = iolist_to_binary(Raw1), 927 {Huff1, State1} = encode(Headers1, State0), 928 << 16#488264025885aec3771a4b6196d07abe941054d444a8200595040b8166e082a62d1bff6e919d29ad171863c78f0b97c8e9ae82ae43d3:432 >> = iolist_to_binary(Huff1), 929 #state{size=222, dyn_table=[ 930 {63,{<<"location">>, <<"https://www.example.com">>}}, 931 {65,{<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}}, 932 {52,{<<"cache-control">>, <<"private">>}}, 933 {42,{<<":status">>, <<"302">>}}]} = State1, 934 %% Second response (raw then huffman). 935 Headers2 = [ 936 {<<":status">>, <<"307">>}, 937 {<<"cache-control">>, <<"private">>}, 938 {<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}, 939 {<<"location">>, <<"https://www.example.com">>} 940 ], 941 {Raw2, State2} = encode(Headers2, State1, #{huffman => false}), 942 << 16#4803333037c1c0bf:64 >> = iolist_to_binary(Raw2), 943 {Huff2, State2} = encode(Headers2, State1), 944 << 16#4883640effc1c0bf:64 >> = iolist_to_binary(Huff2), 945 #state{size=222, dyn_table=[ 946 {42,{<<":status">>, <<"307">>}}, 947 {63,{<<"location">>, <<"https://www.example.com">>}}, 948 {65,{<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}}, 949 {52,{<<"cache-control">>, <<"private">>}}]} = State2, 950 %% Third response (raw then huffman). 951 Headers3 = [ 952 {<<":status">>, <<"200">>}, 953 {<<"cache-control">>, <<"private">>}, 954 {<<"date">>, <<"Mon, 21 Oct 2013 20:13:22 GMT">>}, 955 {<<"location">>, <<"https://www.example.com">>}, 956 {<<"content-encoding">>, <<"gzip">>}, 957 {<<"set-cookie">>, <<"foo=ASDJKHQKBZXOQWEOPIUAXQWEOIU; max-age=3600; version=1">>} 958 ], 959 {Raw3, State3} = encode(Headers3, State2, #{huffman => false}), 960 << 16#88c1611d4d6f6e2c203231204f637420323031332032303a31333a323220474d54c05a04677a69707738666f6f3d4153444a4b48514b425a584f5157454f50495541585157454f49553b206d61782d6167653d333630303b2076657273696f6e3d31:784 >> = iolist_to_binary(Raw3), 961 {Huff3, State3} = encode(Headers3, State2), 962 << 16#88c16196d07abe941054d444a8200595040b8166e084a62d1bffc05a839bd9ab77ad94e7821dd7f2e6c7b335dfdfcd5b3960d5af27087f3672c1ab270fb5291f9587316065c003ed4ee5b1063d5007:632 >> = iolist_to_binary(Huff3), 963 #state{size=215, dyn_table=[ 964 {98,{<<"set-cookie">>, <<"foo=ASDJKHQKBZXOQWEOPIUAXQWEOIU; max-age=3600; version=1">>}}, 965 {52,{<<"content-encoding">>, <<"gzip">>}}, 966 {65,{<<"date">>, <<"Mon, 21 Oct 2013 20:13:22 GMT">>}}]} = State3, 967 ok. 968 969%% This test assumes that table updates work correctly when decoding. 970table_update_encode_test() -> 971 %% Use a max_size of 256 to trigger header evictions 972 %% when the code is not updating the max size. 973 DecState0 = EncState0 = init(256), 974 %% First response. 975 Headers1 = [ 976 {<<":status">>, <<"302">>}, 977 {<<"cache-control">>, <<"private">>}, 978 {<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}, 979 {<<"location">>, <<"https://www.example.com">>} 980 ], 981 {Encoded1, EncState1} = encode(Headers1, EncState0), 982 {Headers1, DecState1} = decode(iolist_to_binary(Encoded1), DecState0), 983 #state{size=222, configured_max_size=256, dyn_table=[ 984 {63,{<<"location">>, <<"https://www.example.com">>}}, 985 {65,{<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}}, 986 {52,{<<"cache-control">>, <<"private">>}}, 987 {42,{<<":status">>, <<"302">>}}]} = DecState1, 988 #state{size=222, configured_max_size=256, dyn_table=[ 989 {63,{<<"location">>, <<"https://www.example.com">>}}, 990 {65,{<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}}, 991 {52,{<<"cache-control">>, <<"private">>}}, 992 {42,{<<":status">>, <<"302">>}}]} = EncState1, 993 %% Set a new configured max_size to avoid header evictions. 994 DecState2 = set_max_size(512, DecState1), 995 EncState2 = set_max_size(512, EncState1), 996 %% Second response. 997 Headers2 = [ 998 {<<":status">>, <<"307">>}, 999 {<<"cache-control">>, <<"private">>}, 1000 {<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}, 1001 {<<"location">>, <<"https://www.example.com">>} 1002 ], 1003 {Encoded2, EncState3} = encode(Headers2, EncState2), 1004 {Headers2, DecState3} = decode(iolist_to_binary(Encoded2), DecState2), 1005 #state{size=264, max_size=512, dyn_table=[ 1006 {42,{<<":status">>, <<"307">>}}, 1007 {63,{<<"location">>, <<"https://www.example.com">>}}, 1008 {65,{<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}}, 1009 {52,{<<"cache-control">>, <<"private">>}}, 1010 {42,{<<":status">>, <<"302">>}}]} = DecState3, 1011 #state{size=264, max_size=512, dyn_table=[ 1012 {42,{<<":status">>, <<"307">>}}, 1013 {63,{<<"location">>, <<"https://www.example.com">>}}, 1014 {65,{<<"date">>, <<"Mon, 21 Oct 2013 20:13:21 GMT">>}}, 1015 {52,{<<"cache-control">>, <<"private">>}}, 1016 {42,{<<":status">>, <<"302">>}}]} = EncState3, 1017 ok. 1018 1019encode_iolist_test() -> 1020 Headers = [ 1021 {<<":method">>, <<"GET">>}, 1022 {<<":scheme">>, <<"http">>}, 1023 {<<":path">>, <<"/">>}, 1024 {<<":authority">>, <<"www.example.com">>}, 1025 {<<"content-type">>, [<<"image">>,<<"/">>,<<"png">>,<<>>]} 1026 ], 1027 {_, _} = encode(Headers), 1028 ok. 1029 1030horse_encode_raw() -> 1031 horse:repeat(20000, 1032 do_horse_encode_raw() 1033 ). 1034 1035do_horse_encode_raw() -> 1036 Headers1 = [ 1037 {<<":method">>, <<"GET">>}, 1038 {<<":scheme">>, <<"http">>}, 1039 {<<":path">>, <<"/">>}, 1040 {<<":authority">>, <<"www.example.com">>} 1041 ], 1042 {_, State1} = encode(Headers1, init(), #{huffman => false}), 1043 Headers2 = [ 1044 {<<":method">>, <<"GET">>}, 1045 {<<":scheme">>, <<"http">>}, 1046 {<<":path">>, <<"/">>}, 1047 {<<":authority">>, <<"www.example.com">>}, 1048 {<<"cache-control">>, <<"no-cache">>} 1049 ], 1050 {_, State2} = encode(Headers2, State1, #{huffman => false}), 1051 Headers3 = [ 1052 {<<":method">>, <<"GET">>}, 1053 {<<":scheme">>, <<"https">>}, 1054 {<<":path">>, <<"/index.html">>}, 1055 {<<":authority">>, <<"www.example.com">>}, 1056 {<<"custom-key">>, <<"custom-value">>} 1057 ], 1058 {_, _} = encode(Headers3, State2, #{huffman => false}), 1059 ok. 1060 1061horse_encode_huffman() -> 1062 horse:repeat(20000, 1063 do_horse_encode_huffman() 1064 ). 1065 1066do_horse_encode_huffman() -> 1067 Headers1 = [ 1068 {<<":method">>, <<"GET">>}, 1069 {<<":scheme">>, <<"http">>}, 1070 {<<":path">>, <<"/">>}, 1071 {<<":authority">>, <<"www.example.com">>} 1072 ], 1073 {_, State1} = encode(Headers1), 1074 Headers2 = [ 1075 {<<":method">>, <<"GET">>}, 1076 {<<":scheme">>, <<"http">>}, 1077 {<<":path">>, <<"/">>}, 1078 {<<":authority">>, <<"www.example.com">>}, 1079 {<<"cache-control">>, <<"no-cache">>} 1080 ], 1081 {_, State2} = encode(Headers2, State1), 1082 Headers3 = [ 1083 {<<":method">>, <<"GET">>}, 1084 {<<":scheme">>, <<"https">>}, 1085 {<<":path">>, <<"/index.html">>}, 1086 {<<":authority">>, <<"www.example.com">>}, 1087 {<<"custom-key">>, <<"custom-value">>} 1088 ], 1089 {_, _} = encode(Headers3, State2), 1090 ok. 1091-endif. 1092 1093%% Static and dynamic tables. 1094 1095%% @todo There must be a more efficient way. 1096table_find(Header = {Name, _}, State) -> 1097 case table_find_field(Header, State) of 1098 not_found -> 1099 case table_find_name(Name, State) of 1100 NotFound = not_found -> 1101 NotFound; 1102 Found -> 1103 {name, Found} 1104 end; 1105 Found -> 1106 {field, Found} 1107 end. 1108 1109table_find_field({<<":authority">>, <<>>}, _) -> 1; 1110table_find_field({<<":method">>, <<"GET">>}, _) -> 2; 1111table_find_field({<<":method">>, <<"POST">>}, _) -> 3; 1112table_find_field({<<":path">>, <<"/">>}, _) -> 4; 1113table_find_field({<<":path">>, <<"/index.html">>}, _) -> 5; 1114table_find_field({<<":scheme">>, <<"http">>}, _) -> 6; 1115table_find_field({<<":scheme">>, <<"https">>}, _) -> 7; 1116table_find_field({<<":status">>, <<"200">>}, _) -> 8; 1117table_find_field({<<":status">>, <<"204">>}, _) -> 9; 1118table_find_field({<<":status">>, <<"206">>}, _) -> 10; 1119table_find_field({<<":status">>, <<"304">>}, _) -> 11; 1120table_find_field({<<":status">>, <<"400">>}, _) -> 12; 1121table_find_field({<<":status">>, <<"404">>}, _) -> 13; 1122table_find_field({<<":status">>, <<"500">>}, _) -> 14; 1123table_find_field({<<"accept-charset">>, <<>>}, _) -> 15; 1124table_find_field({<<"accept-encoding">>, <<"gzip, deflate">>}, _) -> 16; 1125table_find_field({<<"accept-language">>, <<>>}, _) -> 17; 1126table_find_field({<<"accept-ranges">>, <<>>}, _) -> 18; 1127table_find_field({<<"accept">>, <<>>}, _) -> 19; 1128table_find_field({<<"access-control-allow-origin">>, <<>>}, _) -> 20; 1129table_find_field({<<"age">>, <<>>}, _) -> 21; 1130table_find_field({<<"allow">>, <<>>}, _) -> 22; 1131table_find_field({<<"authorization">>, <<>>}, _) -> 23; 1132table_find_field({<<"cache-control">>, <<>>}, _) -> 24; 1133table_find_field({<<"content-disposition">>, <<>>}, _) -> 25; 1134table_find_field({<<"content-encoding">>, <<>>}, _) -> 26; 1135table_find_field({<<"content-language">>, <<>>}, _) -> 27; 1136table_find_field({<<"content-length">>, <<>>}, _) -> 28; 1137table_find_field({<<"content-location">>, <<>>}, _) -> 29; 1138table_find_field({<<"content-range">>, <<>>}, _) -> 30; 1139table_find_field({<<"content-type">>, <<>>}, _) -> 31; 1140table_find_field({<<"cookie">>, <<>>}, _) -> 32; 1141table_find_field({<<"date">>, <<>>}, _) -> 33; 1142table_find_field({<<"etag">>, <<>>}, _) -> 34; 1143table_find_field({<<"expect">>, <<>>}, _) -> 35; 1144table_find_field({<<"expires">>, <<>>}, _) -> 36; 1145table_find_field({<<"from">>, <<>>}, _) -> 37; 1146table_find_field({<<"host">>, <<>>}, _) -> 38; 1147table_find_field({<<"if-match">>, <<>>}, _) -> 39; 1148table_find_field({<<"if-modified-since">>, <<>>}, _) -> 40; 1149table_find_field({<<"if-none-match">>, <<>>}, _) -> 41; 1150table_find_field({<<"if-range">>, <<>>}, _) -> 42; 1151table_find_field({<<"if-unmodified-since">>, <<>>}, _) -> 43; 1152table_find_field({<<"last-modified">>, <<>>}, _) -> 44; 1153table_find_field({<<"link">>, <<>>}, _) -> 45; 1154table_find_field({<<"location">>, <<>>}, _) -> 46; 1155table_find_field({<<"max-forwards">>, <<>>}, _) -> 47; 1156table_find_field({<<"proxy-authenticate">>, <<>>}, _) -> 48; 1157table_find_field({<<"proxy-authorization">>, <<>>}, _) -> 49; 1158table_find_field({<<"range">>, <<>>}, _) -> 50; 1159table_find_field({<<"referer">>, <<>>}, _) -> 51; 1160table_find_field({<<"refresh">>, <<>>}, _) -> 52; 1161table_find_field({<<"retry-after">>, <<>>}, _) -> 53; 1162table_find_field({<<"server">>, <<>>}, _) -> 54; 1163table_find_field({<<"set-cookie">>, <<>>}, _) -> 55; 1164table_find_field({<<"strict-transport-security">>, <<>>}, _) -> 56; 1165table_find_field({<<"transfer-encoding">>, <<>>}, _) -> 57; 1166table_find_field({<<"user-agent">>, <<>>}, _) -> 58; 1167table_find_field({<<"vary">>, <<>>}, _) -> 59; 1168table_find_field({<<"via">>, <<>>}, _) -> 60; 1169table_find_field({<<"www-authenticate">>, <<>>}, _) -> 61; 1170table_find_field(Header, #state{dyn_table=DynamicTable}) -> 1171 table_find_field_dyn(Header, DynamicTable, 62). 1172 1173table_find_field_dyn(_, [], _) -> not_found; 1174table_find_field_dyn(Header, [{_, Header}|_], Index) -> Index; 1175table_find_field_dyn(Header, [_|Tail], Index) -> table_find_field_dyn(Header, Tail, Index + 1). 1176 1177table_find_name(<<":authority">>, _) -> 1; 1178table_find_name(<<":method">>, _) -> 2; 1179table_find_name(<<":path">>, _) -> 4; 1180table_find_name(<<":scheme">>, _) -> 6; 1181table_find_name(<<":status">>, _) -> 8; 1182table_find_name(<<"accept-charset">>, _) -> 15; 1183table_find_name(<<"accept-encoding">>, _) -> 16; 1184table_find_name(<<"accept-language">>, _) -> 17; 1185table_find_name(<<"accept-ranges">>, _) -> 18; 1186table_find_name(<<"accept">>, _) -> 19; 1187table_find_name(<<"access-control-allow-origin">>, _) -> 20; 1188table_find_name(<<"age">>, _) -> 21; 1189table_find_name(<<"allow">>, _) -> 22; 1190table_find_name(<<"authorization">>, _) -> 23; 1191table_find_name(<<"cache-control">>, _) -> 24; 1192table_find_name(<<"content-disposition">>, _) -> 25; 1193table_find_name(<<"content-encoding">>, _) -> 26; 1194table_find_name(<<"content-language">>, _) -> 27; 1195table_find_name(<<"content-length">>, _) -> 28; 1196table_find_name(<<"content-location">>, _) -> 29; 1197table_find_name(<<"content-range">>, _) -> 30; 1198table_find_name(<<"content-type">>, _) -> 31; 1199table_find_name(<<"cookie">>, _) -> 32; 1200table_find_name(<<"date">>, _) -> 33; 1201table_find_name(<<"etag">>, _) -> 34; 1202table_find_name(<<"expect">>, _) -> 35; 1203table_find_name(<<"expires">>, _) -> 36; 1204table_find_name(<<"from">>, _) -> 37; 1205table_find_name(<<"host">>, _) -> 38; 1206table_find_name(<<"if-match">>, _) -> 39; 1207table_find_name(<<"if-modified-since">>, _) -> 40; 1208table_find_name(<<"if-none-match">>, _) -> 41; 1209table_find_name(<<"if-range">>, _) -> 42; 1210table_find_name(<<"if-unmodified-since">>, _) -> 43; 1211table_find_name(<<"last-modified">>, _) -> 44; 1212table_find_name(<<"link">>, _) -> 45; 1213table_find_name(<<"location">>, _) -> 46; 1214table_find_name(<<"max-forwards">>, _) -> 47; 1215table_find_name(<<"proxy-authenticate">>, _) -> 48; 1216table_find_name(<<"proxy-authorization">>, _) -> 49; 1217table_find_name(<<"range">>, _) -> 50; 1218table_find_name(<<"referer">>, _) -> 51; 1219table_find_name(<<"refresh">>, _) -> 52; 1220table_find_name(<<"retry-after">>, _) -> 53; 1221table_find_name(<<"server">>, _) -> 54; 1222table_find_name(<<"set-cookie">>, _) -> 55; 1223table_find_name(<<"strict-transport-security">>, _) -> 56; 1224table_find_name(<<"transfer-encoding">>, _) -> 57; 1225table_find_name(<<"user-agent">>, _) -> 58; 1226table_find_name(<<"vary">>, _) -> 59; 1227table_find_name(<<"via">>, _) -> 60; 1228table_find_name(<<"www-authenticate">>, _) -> 61; 1229table_find_name(Name, #state{dyn_table=DynamicTable}) -> 1230 table_find_name_dyn(Name, DynamicTable, 62). 1231 1232table_find_name_dyn(_, [], _) -> not_found; 1233table_find_name_dyn(Name, [{Name, _}|_], Index) -> Index; 1234table_find_name_dyn(Name, [_|Tail], Index) -> table_find_name_dyn(Name, Tail, Index + 1). 1235 1236table_get(1, _) -> {<<":authority">>, <<>>}; 1237table_get(2, _) -> {<<":method">>, <<"GET">>}; 1238table_get(3, _) -> {<<":method">>, <<"POST">>}; 1239table_get(4, _) -> {<<":path">>, <<"/">>}; 1240table_get(5, _) -> {<<":path">>, <<"/index.html">>}; 1241table_get(6, _) -> {<<":scheme">>, <<"http">>}; 1242table_get(7, _) -> {<<":scheme">>, <<"https">>}; 1243table_get(8, _) -> {<<":status">>, <<"200">>}; 1244table_get(9, _) -> {<<":status">>, <<"204">>}; 1245table_get(10, _) -> {<<":status">>, <<"206">>}; 1246table_get(11, _) -> {<<":status">>, <<"304">>}; 1247table_get(12, _) -> {<<":status">>, <<"400">>}; 1248table_get(13, _) -> {<<":status">>, <<"404">>}; 1249table_get(14, _) -> {<<":status">>, <<"500">>}; 1250table_get(15, _) -> {<<"accept-charset">>, <<>>}; 1251table_get(16, _) -> {<<"accept-encoding">>, <<"gzip, deflate">>}; 1252table_get(17, _) -> {<<"accept-language">>, <<>>}; 1253table_get(18, _) -> {<<"accept-ranges">>, <<>>}; 1254table_get(19, _) -> {<<"accept">>, <<>>}; 1255table_get(20, _) -> {<<"access-control-allow-origin">>, <<>>}; 1256table_get(21, _) -> {<<"age">>, <<>>}; 1257table_get(22, _) -> {<<"allow">>, <<>>}; 1258table_get(23, _) -> {<<"authorization">>, <<>>}; 1259table_get(24, _) -> {<<"cache-control">>, <<>>}; 1260table_get(25, _) -> {<<"content-disposition">>, <<>>}; 1261table_get(26, _) -> {<<"content-encoding">>, <<>>}; 1262table_get(27, _) -> {<<"content-language">>, <<>>}; 1263table_get(28, _) -> {<<"content-length">>, <<>>}; 1264table_get(29, _) -> {<<"content-location">>, <<>>}; 1265table_get(30, _) -> {<<"content-range">>, <<>>}; 1266table_get(31, _) -> {<<"content-type">>, <<>>}; 1267table_get(32, _) -> {<<"cookie">>, <<>>}; 1268table_get(33, _) -> {<<"date">>, <<>>}; 1269table_get(34, _) -> {<<"etag">>, <<>>}; 1270table_get(35, _) -> {<<"expect">>, <<>>}; 1271table_get(36, _) -> {<<"expires">>, <<>>}; 1272table_get(37, _) -> {<<"from">>, <<>>}; 1273table_get(38, _) -> {<<"host">>, <<>>}; 1274table_get(39, _) -> {<<"if-match">>, <<>>}; 1275table_get(40, _) -> {<<"if-modified-since">>, <<>>}; 1276table_get(41, _) -> {<<"if-none-match">>, <<>>}; 1277table_get(42, _) -> {<<"if-range">>, <<>>}; 1278table_get(43, _) -> {<<"if-unmodified-since">>, <<>>}; 1279table_get(44, _) -> {<<"last-modified">>, <<>>}; 1280table_get(45, _) -> {<<"link">>, <<>>}; 1281table_get(46, _) -> {<<"location">>, <<>>}; 1282table_get(47, _) -> {<<"max-forwards">>, <<>>}; 1283table_get(48, _) -> {<<"proxy-authenticate">>, <<>>}; 1284table_get(49, _) -> {<<"proxy-authorization">>, <<>>}; 1285table_get(50, _) -> {<<"range">>, <<>>}; 1286table_get(51, _) -> {<<"referer">>, <<>>}; 1287table_get(52, _) -> {<<"refresh">>, <<>>}; 1288table_get(53, _) -> {<<"retry-after">>, <<>>}; 1289table_get(54, _) -> {<<"server">>, <<>>}; 1290table_get(55, _) -> {<<"set-cookie">>, <<>>}; 1291table_get(56, _) -> {<<"strict-transport-security">>, <<>>}; 1292table_get(57, _) -> {<<"transfer-encoding">>, <<>>}; 1293table_get(58, _) -> {<<"user-agent">>, <<>>}; 1294table_get(59, _) -> {<<"vary">>, <<>>}; 1295table_get(60, _) -> {<<"via">>, <<>>}; 1296table_get(61, _) -> {<<"www-authenticate">>, <<>>}; 1297table_get(Index, #state{dyn_table=DynamicTable}) -> 1298 {_, Header} = lists:nth(Index - 61, DynamicTable), 1299 Header. 1300 1301table_get_name(1, _) -> <<":authority">>; 1302table_get_name(2, _) -> <<":method">>; 1303table_get_name(3, _) -> <<":method">>; 1304table_get_name(4, _) -> <<":path">>; 1305table_get_name(5, _) -> <<":path">>; 1306table_get_name(6, _) -> <<":scheme">>; 1307table_get_name(7, _) -> <<":scheme">>; 1308table_get_name(8, _) -> <<":status">>; 1309table_get_name(9, _) -> <<":status">>; 1310table_get_name(10, _) -> <<":status">>; 1311table_get_name(11, _) -> <<":status">>; 1312table_get_name(12, _) -> <<":status">>; 1313table_get_name(13, _) -> <<":status">>; 1314table_get_name(14, _) -> <<":status">>; 1315table_get_name(15, _) -> <<"accept-charset">>; 1316table_get_name(16, _) -> <<"accept-encoding">>; 1317table_get_name(17, _) -> <<"accept-language">>; 1318table_get_name(18, _) -> <<"accept-ranges">>; 1319table_get_name(19, _) -> <<"accept">>; 1320table_get_name(20, _) -> <<"access-control-allow-origin">>; 1321table_get_name(21, _) -> <<"age">>; 1322table_get_name(22, _) -> <<"allow">>; 1323table_get_name(23, _) -> <<"authorization">>; 1324table_get_name(24, _) -> <<"cache-control">>; 1325table_get_name(25, _) -> <<"content-disposition">>; 1326table_get_name(26, _) -> <<"content-encoding">>; 1327table_get_name(27, _) -> <<"content-language">>; 1328table_get_name(28, _) -> <<"content-length">>; 1329table_get_name(29, _) -> <<"content-location">>; 1330table_get_name(30, _) -> <<"content-range">>; 1331table_get_name(31, _) -> <<"content-type">>; 1332table_get_name(32, _) -> <<"cookie">>; 1333table_get_name(33, _) -> <<"date">>; 1334table_get_name(34, _) -> <<"etag">>; 1335table_get_name(35, _) -> <<"expect">>; 1336table_get_name(36, _) -> <<"expires">>; 1337table_get_name(37, _) -> <<"from">>; 1338table_get_name(38, _) -> <<"host">>; 1339table_get_name(39, _) -> <<"if-match">>; 1340table_get_name(40, _) -> <<"if-modified-since">>; 1341table_get_name(41, _) -> <<"if-none-match">>; 1342table_get_name(42, _) -> <<"if-range">>; 1343table_get_name(43, _) -> <<"if-unmodified-since">>; 1344table_get_name(44, _) -> <<"last-modified">>; 1345table_get_name(45, _) -> <<"link">>; 1346table_get_name(46, _) -> <<"location">>; 1347table_get_name(47, _) -> <<"max-forwards">>; 1348table_get_name(48, _) -> <<"proxy-authenticate">>; 1349table_get_name(49, _) -> <<"proxy-authorization">>; 1350table_get_name(50, _) -> <<"range">>; 1351table_get_name(51, _) -> <<"referer">>; 1352table_get_name(52, _) -> <<"refresh">>; 1353table_get_name(53, _) -> <<"retry-after">>; 1354table_get_name(54, _) -> <<"server">>; 1355table_get_name(55, _) -> <<"set-cookie">>; 1356table_get_name(56, _) -> <<"strict-transport-security">>; 1357table_get_name(57, _) -> <<"transfer-encoding">>; 1358table_get_name(58, _) -> <<"user-agent">>; 1359table_get_name(59, _) -> <<"vary">>; 1360table_get_name(60, _) -> <<"via">>; 1361table_get_name(61, _) -> <<"www-authenticate">>; 1362table_get_name(Index, #state{dyn_table=DynamicTable}) -> 1363 {_, {Name, _}} = lists:nth(Index - 61, DynamicTable), 1364 Name. 1365 1366table_insert(Entry = {Name, Value}, State=#state{size=Size, max_size=MaxSize, dyn_table=DynamicTable}) -> 1367 EntrySize = byte_size(Name) + byte_size(Value) + 32, 1368 {DynamicTable2, Size2} = if 1369 Size + EntrySize > MaxSize -> 1370 table_resize(DynamicTable, MaxSize - EntrySize, 0, []); 1371 true -> 1372 {DynamicTable, Size} 1373 end, 1374 State#state{size=Size2 + EntrySize, dyn_table=[{EntrySize, Entry}|DynamicTable2]}. 1375 1376table_resize([], _, Size, Acc) -> 1377 {lists:reverse(Acc), Size}; 1378table_resize([{EntrySize, _}|_], MaxSize, Size, Acc) when Size + EntrySize > MaxSize -> 1379 {lists:reverse(Acc), Size}; 1380table_resize([Entry = {EntrySize, _}|Tail], MaxSize, Size, Acc) -> 1381 table_resize(Tail, MaxSize, Size + EntrySize, [Entry|Acc]). 1382 1383table_update_size(0, State) -> 1384 State#state{size=0, max_size=0, dyn_table=[]}; 1385table_update_size(MaxSize, State=#state{max_size=CurrentMaxSize}) 1386 when CurrentMaxSize =< MaxSize -> 1387 State#state{max_size=MaxSize}; 1388table_update_size(MaxSize, State=#state{dyn_table=DynTable}) -> 1389 {DynTable2, Size} = table_resize(DynTable, MaxSize, 0, []), 1390 State#state{size=Size, max_size=MaxSize, dyn_table=DynTable2}. 1391 1392-ifdef(TEST). 1393prop_str_raw() -> 1394 ?FORALL(Str, binary(), begin 1395 {Str, <<>>} =:= dec_str(iolist_to_binary(enc_str(Str, no_huffman))) 1396 end). 1397 1398prop_str_huffman() -> 1399 ?FORALL(Str, binary(), begin 1400 {Str, <<>>} =:= dec_str(iolist_to_binary(enc_str(Str, huffman))) 1401 end). 1402-endif. 1403