1 /*
2 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package jdk.incubator.http.internal.hpack;
24
25 import org.testng.annotations.Test;
26
27 import java.io.IOException;
28 import java.io.UncheckedIOException;
29 import java.nio.ByteBuffer;
30 import java.util.Stack;
31 import java.util.regex.Matcher;
32 import java.util.regex.Pattern;
33
34 import static java.lang.Integer.parseInt;
35 import static org.testng.Assert.*;
36
37 public final class HuffmanTest {
38
39 //
40 // https://tools.ietf.org/html/rfc7541#appendix-B
41 //
42 private static final String SPEC =
43 // @formatter:off
44 " code as bits as hex len\n" +
45 " sym aligned to MSB aligned in\n" +
46 " to LSB bits\n" +
47 " ( 0) |11111111|11000 1ff8 [13]\n" +
48 " ( 1) |11111111|11111111|1011000 7fffd8 [23]\n" +
49 " ( 2) |11111111|11111111|11111110|0010 fffffe2 [28]\n" +
50 " ( 3) |11111111|11111111|11111110|0011 fffffe3 [28]\n" +
51 " ( 4) |11111111|11111111|11111110|0100 fffffe4 [28]\n" +
52 " ( 5) |11111111|11111111|11111110|0101 fffffe5 [28]\n" +
53 " ( 6) |11111111|11111111|11111110|0110 fffffe6 [28]\n" +
54 " ( 7) |11111111|11111111|11111110|0111 fffffe7 [28]\n" +
55 " ( 8) |11111111|11111111|11111110|1000 fffffe8 [28]\n" +
56 " ( 9) |11111111|11111111|11101010 ffffea [24]\n" +
57 " ( 10) |11111111|11111111|11111111|111100 3ffffffc [30]\n" +
58 " ( 11) |11111111|11111111|11111110|1001 fffffe9 [28]\n" +
59 " ( 12) |11111111|11111111|11111110|1010 fffffea [28]\n" +
60 " ( 13) |11111111|11111111|11111111|111101 3ffffffd [30]\n" +
61 " ( 14) |11111111|11111111|11111110|1011 fffffeb [28]\n" +
62 " ( 15) |11111111|11111111|11111110|1100 fffffec [28]\n" +
63 " ( 16) |11111111|11111111|11111110|1101 fffffed [28]\n" +
64 " ( 17) |11111111|11111111|11111110|1110 fffffee [28]\n" +
65 " ( 18) |11111111|11111111|11111110|1111 fffffef [28]\n" +
66 " ( 19) |11111111|11111111|11111111|0000 ffffff0 [28]\n" +
67 " ( 20) |11111111|11111111|11111111|0001 ffffff1 [28]\n" +
68 " ( 21) |11111111|11111111|11111111|0010 ffffff2 [28]\n" +
69 " ( 22) |11111111|11111111|11111111|111110 3ffffffe [30]\n" +
70 " ( 23) |11111111|11111111|11111111|0011 ffffff3 [28]\n" +
71 " ( 24) |11111111|11111111|11111111|0100 ffffff4 [28]\n" +
72 " ( 25) |11111111|11111111|11111111|0101 ffffff5 [28]\n" +
73 " ( 26) |11111111|11111111|11111111|0110 ffffff6 [28]\n" +
74 " ( 27) |11111111|11111111|11111111|0111 ffffff7 [28]\n" +
75 " ( 28) |11111111|11111111|11111111|1000 ffffff8 [28]\n" +
76 " ( 29) |11111111|11111111|11111111|1001 ffffff9 [28]\n" +
77 " ( 30) |11111111|11111111|11111111|1010 ffffffa [28]\n" +
78 " ( 31) |11111111|11111111|11111111|1011 ffffffb [28]\n" +
79 " ' ' ( 32) |010100 14 [ 6]\n" +
80 " '!' ( 33) |11111110|00 3f8 [10]\n" +
81 " '\"' ( 34) |11111110|01 3f9 [10]\n" +
82 " '#' ( 35) |11111111|1010 ffa [12]\n" +
83 " '$' ( 36) |11111111|11001 1ff9 [13]\n" +
84 " '%' ( 37) |010101 15 [ 6]\n" +
85 " '&' ( 38) |11111000 f8 [ 8]\n" +
86 " ''' ( 39) |11111111|010 7fa [11]\n" +
87 " '(' ( 40) |11111110|10 3fa [10]\n" +
88 " ')' ( 41) |11111110|11 3fb [10]\n" +
89 " '*' ( 42) |11111001 f9 [ 8]\n" +
90 " '+' ( 43) |11111111|011 7fb [11]\n" +
91 " ',' ( 44) |11111010 fa [ 8]\n" +
92 " '-' ( 45) |010110 16 [ 6]\n" +
93 " '.' ( 46) |010111 17 [ 6]\n" +
94 " '/' ( 47) |011000 18 [ 6]\n" +
95 " '0' ( 48) |00000 0 [ 5]\n" +
96 " '1' ( 49) |00001 1 [ 5]\n" +
97 " '2' ( 50) |00010 2 [ 5]\n" +
98 " '3' ( 51) |011001 19 [ 6]\n" +
99 " '4' ( 52) |011010 1a [ 6]\n" +
100 " '5' ( 53) |011011 1b [ 6]\n" +
101 " '6' ( 54) |011100 1c [ 6]\n" +
102 " '7' ( 55) |011101 1d [ 6]\n" +
103 " '8' ( 56) |011110 1e [ 6]\n" +
104 " '9' ( 57) |011111 1f [ 6]\n" +
105 " ':' ( 58) |1011100 5c [ 7]\n" +
106 " ';' ( 59) |11111011 fb [ 8]\n" +
107 " '<' ( 60) |11111111|1111100 7ffc [15]\n" +
108 " '=' ( 61) |100000 20 [ 6]\n" +
109 " '>' ( 62) |11111111|1011 ffb [12]\n" +
110 " '?' ( 63) |11111111|00 3fc [10]\n" +
111 " '@' ( 64) |11111111|11010 1ffa [13]\n" +
112 " 'A' ( 65) |100001 21 [ 6]\n" +
113 " 'B' ( 66) |1011101 5d [ 7]\n" +
114 " 'C' ( 67) |1011110 5e [ 7]\n" +
115 " 'D' ( 68) |1011111 5f [ 7]\n" +
116 " 'E' ( 69) |1100000 60 [ 7]\n" +
117 " 'F' ( 70) |1100001 61 [ 7]\n" +
118 " 'G' ( 71) |1100010 62 [ 7]\n" +
119 " 'H' ( 72) |1100011 63 [ 7]\n" +
120 " 'I' ( 73) |1100100 64 [ 7]\n" +
121 " 'J' ( 74) |1100101 65 [ 7]\n" +
122 " 'K' ( 75) |1100110 66 [ 7]\n" +
123 " 'L' ( 76) |1100111 67 [ 7]\n" +
124 " 'M' ( 77) |1101000 68 [ 7]\n" +
125 " 'N' ( 78) |1101001 69 [ 7]\n" +
126 " 'O' ( 79) |1101010 6a [ 7]\n" +
127 " 'P' ( 80) |1101011 6b [ 7]\n" +
128 " 'Q' ( 81) |1101100 6c [ 7]\n" +
129 " 'R' ( 82) |1101101 6d [ 7]\n" +
130 " 'S' ( 83) |1101110 6e [ 7]\n" +
131 " 'T' ( 84) |1101111 6f [ 7]\n" +
132 " 'U' ( 85) |1110000 70 [ 7]\n" +
133 " 'V' ( 86) |1110001 71 [ 7]\n" +
134 " 'W' ( 87) |1110010 72 [ 7]\n" +
135 " 'X' ( 88) |11111100 fc [ 8]\n" +
136 " 'Y' ( 89) |1110011 73 [ 7]\n" +
137 " 'Z' ( 90) |11111101 fd [ 8]\n" +
138 " '[' ( 91) |11111111|11011 1ffb [13]\n" +
139 " '\\' ( 92) |11111111|11111110|000 7fff0 [19]\n" +
140 " ']' ( 93) |11111111|11100 1ffc [13]\n" +
141 " '^' ( 94) |11111111|111100 3ffc [14]\n" +
142 " '_' ( 95) |100010 22 [ 6]\n" +
143 " '`' ( 96) |11111111|1111101 7ffd [15]\n" +
144 " 'a' ( 97) |00011 3 [ 5]\n" +
145 " 'b' ( 98) |100011 23 [ 6]\n" +
146 " 'c' ( 99) |00100 4 [ 5]\n" +
147 " 'd' (100) |100100 24 [ 6]\n" +
148 " 'e' (101) |00101 5 [ 5]\n" +
149 " 'f' (102) |100101 25 [ 6]\n" +
150 " 'g' (103) |100110 26 [ 6]\n" +
151 " 'h' (104) |100111 27 [ 6]\n" +
152 " 'i' (105) |00110 6 [ 5]\n" +
153 " 'j' (106) |1110100 74 [ 7]\n" +
154 " 'k' (107) |1110101 75 [ 7]\n" +
155 " 'l' (108) |101000 28 [ 6]\n" +
156 " 'm' (109) |101001 29 [ 6]\n" +
157 " 'n' (110) |101010 2a [ 6]\n" +
158 " 'o' (111) |00111 7 [ 5]\n" +
159 " 'p' (112) |101011 2b [ 6]\n" +
160 " 'q' (113) |1110110 76 [ 7]\n" +
161 " 'r' (114) |101100 2c [ 6]\n" +
162 " 's' (115) |01000 8 [ 5]\n" +
163 " 't' (116) |01001 9 [ 5]\n" +
164 " 'u' (117) |101101 2d [ 6]\n" +
165 " 'v' (118) |1110111 77 [ 7]\n" +
166 " 'w' (119) |1111000 78 [ 7]\n" +
167 " 'x' (120) |1111001 79 [ 7]\n" +
168 " 'y' (121) |1111010 7a [ 7]\n" +
169 " 'z' (122) |1111011 7b [ 7]\n" +
170 " '{' (123) |11111111|1111110 7ffe [15]\n" +
171 " '|' (124) |11111111|100 7fc [11]\n" +
172 " '}' (125) |11111111|111101 3ffd [14]\n" +
173 " '~' (126) |11111111|11101 1ffd [13]\n" +
174 " (127) |11111111|11111111|11111111|1100 ffffffc [28]\n" +
175 " (128) |11111111|11111110|0110 fffe6 [20]\n" +
176 " (129) |11111111|11111111|010010 3fffd2 [22]\n" +
177 " (130) |11111111|11111110|0111 fffe7 [20]\n" +
178 " (131) |11111111|11111110|1000 fffe8 [20]\n" +
179 " (132) |11111111|11111111|010011 3fffd3 [22]\n" +
180 " (133) |11111111|11111111|010100 3fffd4 [22]\n" +
181 " (134) |11111111|11111111|010101 3fffd5 [22]\n" +
182 " (135) |11111111|11111111|1011001 7fffd9 [23]\n" +
183 " (136) |11111111|11111111|010110 3fffd6 [22]\n" +
184 " (137) |11111111|11111111|1011010 7fffda [23]\n" +
185 " (138) |11111111|11111111|1011011 7fffdb [23]\n" +
186 " (139) |11111111|11111111|1011100 7fffdc [23]\n" +
187 " (140) |11111111|11111111|1011101 7fffdd [23]\n" +
188 " (141) |11111111|11111111|1011110 7fffde [23]\n" +
189 " (142) |11111111|11111111|11101011 ffffeb [24]\n" +
190 " (143) |11111111|11111111|1011111 7fffdf [23]\n" +
191 " (144) |11111111|11111111|11101100 ffffec [24]\n" +
192 " (145) |11111111|11111111|11101101 ffffed [24]\n" +
193 " (146) |11111111|11111111|010111 3fffd7 [22]\n" +
194 " (147) |11111111|11111111|1100000 7fffe0 [23]\n" +
195 " (148) |11111111|11111111|11101110 ffffee [24]\n" +
196 " (149) |11111111|11111111|1100001 7fffe1 [23]\n" +
197 " (150) |11111111|11111111|1100010 7fffe2 [23]\n" +
198 " (151) |11111111|11111111|1100011 7fffe3 [23]\n" +
199 " (152) |11111111|11111111|1100100 7fffe4 [23]\n" +
200 " (153) |11111111|11111110|11100 1fffdc [21]\n" +
201 " (154) |11111111|11111111|011000 3fffd8 [22]\n" +
202 " (155) |11111111|11111111|1100101 7fffe5 [23]\n" +
203 " (156) |11111111|11111111|011001 3fffd9 [22]\n" +
204 " (157) |11111111|11111111|1100110 7fffe6 [23]\n" +
205 " (158) |11111111|11111111|1100111 7fffe7 [23]\n" +
206 " (159) |11111111|11111111|11101111 ffffef [24]\n" +
207 " (160) |11111111|11111111|011010 3fffda [22]\n" +
208 " (161) |11111111|11111110|11101 1fffdd [21]\n" +
209 " (162) |11111111|11111110|1001 fffe9 [20]\n" +
210 " (163) |11111111|11111111|011011 3fffdb [22]\n" +
211 " (164) |11111111|11111111|011100 3fffdc [22]\n" +
212 " (165) |11111111|11111111|1101000 7fffe8 [23]\n" +
213 " (166) |11111111|11111111|1101001 7fffe9 [23]\n" +
214 " (167) |11111111|11111110|11110 1fffde [21]\n" +
215 " (168) |11111111|11111111|1101010 7fffea [23]\n" +
216 " (169) |11111111|11111111|011101 3fffdd [22]\n" +
217 " (170) |11111111|11111111|011110 3fffde [22]\n" +
218 " (171) |11111111|11111111|11110000 fffff0 [24]\n" +
219 " (172) |11111111|11111110|11111 1fffdf [21]\n" +
220 " (173) |11111111|11111111|011111 3fffdf [22]\n" +
221 " (174) |11111111|11111111|1101011 7fffeb [23]\n" +
222 " (175) |11111111|11111111|1101100 7fffec [23]\n" +
223 " (176) |11111111|11111111|00000 1fffe0 [21]\n" +
224 " (177) |11111111|11111111|00001 1fffe1 [21]\n" +
225 " (178) |11111111|11111111|100000 3fffe0 [22]\n" +
226 " (179) |11111111|11111111|00010 1fffe2 [21]\n" +
227 " (180) |11111111|11111111|1101101 7fffed [23]\n" +
228 " (181) |11111111|11111111|100001 3fffe1 [22]\n" +
229 " (182) |11111111|11111111|1101110 7fffee [23]\n" +
230 " (183) |11111111|11111111|1101111 7fffef [23]\n" +
231 " (184) |11111111|11111110|1010 fffea [20]\n" +
232 " (185) |11111111|11111111|100010 3fffe2 [22]\n" +
233 " (186) |11111111|11111111|100011 3fffe3 [22]\n" +
234 " (187) |11111111|11111111|100100 3fffe4 [22]\n" +
235 " (188) |11111111|11111111|1110000 7ffff0 [23]\n" +
236 " (189) |11111111|11111111|100101 3fffe5 [22]\n" +
237 " (190) |11111111|11111111|100110 3fffe6 [22]\n" +
238 " (191) |11111111|11111111|1110001 7ffff1 [23]\n" +
239 " (192) |11111111|11111111|11111000|00 3ffffe0 [26]\n" +
240 " (193) |11111111|11111111|11111000|01 3ffffe1 [26]\n" +
241 " (194) |11111111|11111110|1011 fffeb [20]\n" +
242 " (195) |11111111|11111110|001 7fff1 [19]\n" +
243 " (196) |11111111|11111111|100111 3fffe7 [22]\n" +
244 " (197) |11111111|11111111|1110010 7ffff2 [23]\n" +
245 " (198) |11111111|11111111|101000 3fffe8 [22]\n" +
246 " (199) |11111111|11111111|11110110|0 1ffffec [25]\n" +
247 " (200) |11111111|11111111|11111000|10 3ffffe2 [26]\n" +
248 " (201) |11111111|11111111|11111000|11 3ffffe3 [26]\n" +
249 " (202) |11111111|11111111|11111001|00 3ffffe4 [26]\n" +
250 " (203) |11111111|11111111|11111011|110 7ffffde [27]\n" +
251 " (204) |11111111|11111111|11111011|111 7ffffdf [27]\n" +
252 " (205) |11111111|11111111|11111001|01 3ffffe5 [26]\n" +
253 " (206) |11111111|11111111|11110001 fffff1 [24]\n" +
254 " (207) |11111111|11111111|11110110|1 1ffffed [25]\n" +
255 " (208) |11111111|11111110|010 7fff2 [19]\n" +
256 " (209) |11111111|11111111|00011 1fffe3 [21]\n" +
257 " (210) |11111111|11111111|11111001|10 3ffffe6 [26]\n" +
258 " (211) |11111111|11111111|11111100|000 7ffffe0 [27]\n" +
259 " (212) |11111111|11111111|11111100|001 7ffffe1 [27]\n" +
260 " (213) |11111111|11111111|11111001|11 3ffffe7 [26]\n" +
261 " (214) |11111111|11111111|11111100|010 7ffffe2 [27]\n" +
262 " (215) |11111111|11111111|11110010 fffff2 [24]\n" +
263 " (216) |11111111|11111111|00100 1fffe4 [21]\n" +
264 " (217) |11111111|11111111|00101 1fffe5 [21]\n" +
265 " (218) |11111111|11111111|11111010|00 3ffffe8 [26]\n" +
266 " (219) |11111111|11111111|11111010|01 3ffffe9 [26]\n" +
267 " (220) |11111111|11111111|11111111|1101 ffffffd [28]\n" +
268 " (221) |11111111|11111111|11111100|011 7ffffe3 [27]\n" +
269 " (222) |11111111|11111111|11111100|100 7ffffe4 [27]\n" +
270 " (223) |11111111|11111111|11111100|101 7ffffe5 [27]\n" +
271 " (224) |11111111|11111110|1100 fffec [20]\n" +
272 " (225) |11111111|11111111|11110011 fffff3 [24]\n" +
273 " (226) |11111111|11111110|1101 fffed [20]\n" +
274 " (227) |11111111|11111111|00110 1fffe6 [21]\n" +
275 " (228) |11111111|11111111|101001 3fffe9 [22]\n" +
276 " (229) |11111111|11111111|00111 1fffe7 [21]\n" +
277 " (230) |11111111|11111111|01000 1fffe8 [21]\n" +
278 " (231) |11111111|11111111|1110011 7ffff3 [23]\n" +
279 " (232) |11111111|11111111|101010 3fffea [22]\n" +
280 " (233) |11111111|11111111|101011 3fffeb [22]\n" +
281 " (234) |11111111|11111111|11110111|0 1ffffee [25]\n" +
282 " (235) |11111111|11111111|11110111|1 1ffffef [25]\n" +
283 " (236) |11111111|11111111|11110100 fffff4 [24]\n" +
284 " (237) |11111111|11111111|11110101 fffff5 [24]\n" +
285 " (238) |11111111|11111111|11111010|10 3ffffea [26]\n" +
286 " (239) |11111111|11111111|1110100 7ffff4 [23]\n" +
287 " (240) |11111111|11111111|11111010|11 3ffffeb [26]\n" +
288 " (241) |11111111|11111111|11111100|110 7ffffe6 [27]\n" +
289 " (242) |11111111|11111111|11111011|00 3ffffec [26]\n" +
290 " (243) |11111111|11111111|11111011|01 3ffffed [26]\n" +
291 " (244) |11111111|11111111|11111100|111 7ffffe7 [27]\n" +
292 " (245) |11111111|11111111|11111101|000 7ffffe8 [27]\n" +
293 " (246) |11111111|11111111|11111101|001 7ffffe9 [27]\n" +
294 " (247) |11111111|11111111|11111101|010 7ffffea [27]\n" +
295 " (248) |11111111|11111111|11111101|011 7ffffeb [27]\n" +
296 " (249) |11111111|11111111|11111111|1110 ffffffe [28]\n" +
297 " (250) |11111111|11111111|11111101|100 7ffffec [27]\n" +
298 " (251) |11111111|11111111|11111101|101 7ffffed [27]\n" +
299 " (252) |11111111|11111111|11111101|110 7ffffee [27]\n" +
300 " (253) |11111111|11111111|11111101|111 7ffffef [27]\n" +
301 " (254) |11111111|11111111|11111110|000 7fffff0 [27]\n" +
302 " (255) |11111111|11111111|11111011|10 3ffffee [26]\n" +
303 " EOS (256) |11111111|11111111|11111111|111111 3fffffff [30]";
304 // @formatter:on
305
306 @Test
307 public void read_table() throws IOException {
308 Pattern line = Pattern.compile(
309 "\\(\\s*(?<ascii>\\d+)\\s*\\)\\s*(?<binary>(\\|(0|1)+)+)\\s*" +
310 "(?<hex>[0-9a-zA-Z]+)\\s*\\[\\s*(?<len>\\d+)\\s*\\]");
311 Matcher m = line.matcher(SPEC);
312 int i = 0;
313 while (m.find()) {
314 String ascii = m.group("ascii");
315 String binary = m.group("binary").replaceAll("\\|", "");
316 String hex = m.group("hex");
317 String len = m.group("len");
318
319 // Several sanity checks for the data read from the table, just to
320 // make sure what we read makes sense
321 assertEquals(parseInt(len), binary.length());
322 assertEquals(parseInt(binary, 2), parseInt(hex, 16));
323
324 int expected = parseInt(ascii);
325
326 // TODO: find actual eos, do not hardcode it!
327 byte[] bytes = intToBytes(0x3fffffff, 30,
328 parseInt(hex, 16), parseInt(len));
329
330 StringBuilder actual = new StringBuilder();
331 Huffman.Reader t = new Huffman.Reader();
332 t.read(ByteBuffer.wrap(bytes), actual, false, true);
333
334 // What has been read MUST represent a single symbol
335 assertEquals(actual.length(), 1, "ascii: " + ascii);
336
337 // It's a lot more visual to compare char as codes rather than
338 // characters (as some of them might not be visible)
339 assertEquals(actual.charAt(0), expected);
340 i++;
341 }
342 assertEquals(i, 257); // 256 + EOS
343 }
344
345 //
346 // https://tools.ietf.org/html/rfc7541#appendix-C.4.1
347 //
348 @Test
349 public void read_1() {
350 read("f1e3 c2e5 f23a 6ba0 ab90 f4ff", "www.example.com");
351 }
352
353 @Test
354 public void write_1() {
355 write("www.example.com", "f1e3 c2e5 f23a 6ba0 ab90 f4ff");
356 }
357
358 //
359 // https://tools.ietf.org/html/rfc7541#appendix-C.4.2
360 //
361 @Test
362 public void read_2() {
363 read("a8eb 1064 9cbf", "no-cache");
364 }
365
366 @Test
367 public void write_2() {
368 write("no-cache", "a8eb 1064 9cbf");
369 }
370
371 //
372 // https://tools.ietf.org/html/rfc7541#appendix-C.4.3
373 //
374 @Test
375 public void read_3() {
376 read("25a8 49e9 5ba9 7d7f", "custom-key");
377 }
378
379 @Test
380 public void write_3() {
381 write("custom-key", "25a8 49e9 5ba9 7d7f");
382 }
383
384 //
385 // https://tools.ietf.org/html/rfc7541#appendix-C.4.3
386 //
387 @Test
388 public void read_4() {
389 read("25a8 49e9 5bb8 e8b4 bf", "custom-value");
390 }
391
392 @Test
393 public void write_4() {
394 write("custom-value", "25a8 49e9 5bb8 e8b4 bf");
395 }
396
397 //
398 // https://tools.ietf.org/html/rfc7541#appendix-C.6.1
399 //
400 @Test
401 public void read_5() {
402 read("6402", "302");
403 }
404
405 @Test
406 public void write_5() {
407 write("302", "6402");
408 }
409
410 //
411 // https://tools.ietf.org/html/rfc7541#appendix-C.6.1
412 //
413 @Test
414 public void read_6() {
415 read("aec3 771a 4b", "private");
416 }
417
418 @Test
419 public void write_6() {
420 write("private", "aec3 771a 4b");
421 }
422
423 //
424 // https://tools.ietf.org/html/rfc7541#appendix-C.6.1
425 //
426 @Test
427 public void read_7() {
428 read("d07a be94 1054 d444 a820 0595 040b 8166 e082 a62d 1bff",
429 "Mon, 21 Oct 2013 20:13:21 GMT");
430 }
431
432 @Test
433 public void write_7() {
434 write("Mon, 21 Oct 2013 20:13:21 GMT",
435 "d07a be94 1054 d444 a820 0595 040b 8166 e082 a62d 1bff");
436 }
437
438 //
439 // https://tools.ietf.org/html/rfc7541#appendix-C.6.1
440 //
441 @Test
442 public void read_8() {
443 read("9d29 ad17 1863 c78f 0b97 c8e9 ae82 ae43 d3",
444 "https://www.example.com");
445 }
446
447 @Test
448 public void write_8() {
449 write("https://www.example.com",
450 "9d29 ad17 1863 c78f 0b97 c8e9 ae82 ae43 d3");
451 }
452
453 //
454 // https://tools.ietf.org/html/rfc7541#appendix-C.6.2
455 //
456 @Test
457 public void read_9() {
458 read("640e ff", "307");
459 }
460
461 @Test
462 public void write_9() {
463 write("307", "640e ff");
464 }
465
466 //
467 // https://tools.ietf.org/html/rfc7541#appendix-C.6.3
468 //
469 @Test
470 public void read_10() {
471 read("d07a be94 1054 d444 a820 0595 040b 8166 e084 a62d 1bff",
472 "Mon, 21 Oct 2013 20:13:22 GMT");
473 }
474
475 @Test
476 public void write_10() {
477 write("Mon, 21 Oct 2013 20:13:22 GMT",
478 "d07a be94 1054 d444 a820 0595 040b 8166 e084 a62d 1bff");
479 }
480
481 //
482 // https://tools.ietf.org/html/rfc7541#appendix-C.6.3
483 //
484 @Test
485 public void read_11() {
486 read("9bd9 ab", "gzip");
487 }
488
489 @Test
490 public void write_11() {
491 write("gzip", "9bd9 ab");
492 }
493
494 //
495 // https://tools.ietf.org/html/rfc7541#appendix-C.6.3
496 //
497 @Test
498 public void read_12() {
499 read("94e7 821d d7f2 e6c7 b335 dfdf cd5b 3960 " +
500 "d5af 2708 7f36 72c1 ab27 0fb5 291f 9587 " +
501 "3160 65c0 03ed 4ee5 b106 3d50 07",
502 "foo=ASDJKHQKBZXOQWEOPIUAXQWEOIU; max-age=3600; version=1");
503 }
504
505 @Test
506 public void test_trie_has_no_empty_nodes() {
507 Huffman.Node root = Huffman.INSTANCE.getRoot();
508 Stack<Huffman.Node> backlog = new Stack<>();
509 backlog.push(root);
510 while (!backlog.isEmpty()) {
511 Huffman.Node n = backlog.pop();
512 // The only type of nodes we couldn't possibly catch during
513 // construction is an empty node: no children and no char
514 if (n.left != null) {
515 backlog.push(n.left);
516 }
517 if (n.right != null) {
518 backlog.push(n.right);
519 }
520 assertFalse(!n.charIsSet && n.left == null && n.right == null,
521 "Empty node in the trie");
522 }
523 }
524
525 @Test
526 public void test_trie_has_257_nodes() {
527 int count = 0;
528 Huffman.Node root = Huffman.INSTANCE.getRoot();
529 Stack<Huffman.Node> backlog = new Stack<>();
530 backlog.push(root);
531 while (!backlog.isEmpty()) {
532 Huffman.Node n = backlog.pop();
533 if (n.left != null) {
534 backlog.push(n.left);
535 }
536 if (n.right != null) {
537 backlog.push(n.right);
538 }
539 if (n.isLeaf()) {
540 count++;
541 }
542 }
543 assertEquals(count, 257);
544 }
545
546 @Test
547 public void cant_encode_outside_byte() {
548 TestHelper.Block<Object> coding =
549 () -> new Huffman.Writer()
550 .from(((char) 256) + "", 0, 1)
551 .write(ByteBuffer.allocate(1));
552 RuntimeException e =
553 TestHelper.assertVoidThrows(RuntimeException.class, coding);
554 TestHelper.assertExceptionMessageContains(e, "char");
555 }
556
557 private static void read(String hexdump, String decoded) {
558 ByteBuffer source = SpecHelper.toBytes(hexdump);
559 Appendable actual = new StringBuilder();
560 try {
561 new Huffman.Reader().read(source, actual, true);
562 } catch (IOException e) {
563 throw new UncheckedIOException(e);
564 }
565 assertEquals(actual.toString(), decoded);
566 }
567
568 private static void write(String decoded, String hexdump) {
569 int n = Huffman.INSTANCE.lengthOf(decoded);
570 ByteBuffer destination = ByteBuffer.allocate(n); // Extra margin (1) to test having more bytes in the destination than needed is ok
571 Huffman.Writer writer = new Huffman.Writer();
572 BuffersTestingKit.forEachSplit(destination, byteBuffers -> {
573 writer.from(decoded, 0, decoded.length());
574 boolean written = false;
575 for (ByteBuffer b : byteBuffers) {
576 int pos = b.position();
577 written = writer.write(b);
578 b.position(pos);
579 }
580 assertTrue(written);
581 ByteBuffer concated = BuffersTestingKit.concat(byteBuffers);
582 String actual = SpecHelper.toHexdump(concated);
583 assertEquals(actual, hexdump);
584 writer.reset();
585 });
586 }
587
588 //
589 // It's not very pretty, yes I know that
590 //
591 // hex:
592 //
593 // |31|30|...|N-1|...|01|00|
594 // \ /
595 // codeLength
596 //
597 // hex <<= 32 - codeLength; (align to MSB):
598 //
599 // |31|30|...|32-N|...|01|00|
600 // \ /
601 // codeLength
602 //
603 // EOS:
604 //
605 // |31|30|...|M-1|...|01|00|
606 // \ /
607 // eosLength
608 //
609 // eos <<= 32 - eosLength; (align to MSB):
610 //
611 // pad with MSBs of EOS:
612 //
613 // |31|30|...|32-N|32-N-1|...|01|00|
614 // | 32|...|
615 //
616 // Finally, split into byte[]
617 //
618 private byte[] intToBytes(int eos, int eosLength, int hex, int codeLength) {
619 hex <<= 32 - codeLength;
620 eos >>= codeLength - (32 - eosLength);
621 hex |= eos;
622 int n = (int) Math.ceil(codeLength / 8.0);
623 byte[] result = new byte[n];
624 for (int i = 0; i < n; i++) {
625 result[i] = (byte) (hex >> (32 - 8 * (i + 1)));
626 }
627 return result;
628 }
629 }