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https://codeberg.org/forgejo/forgejo.git
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2177 lines
13 KiB
Go
2177 lines
13 KiB
Go
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package brotli
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/* Lookup table to map the previous two bytes to a context id.
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There are four different context modeling modes defined here:
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contextLSB6: context id is the least significant 6 bits of the last byte,
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contextMSB6: context id is the most significant 6 bits of the last byte,
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contextUTF8: second-order context model tuned for UTF8-encoded text,
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contextSigned: second-order context model tuned for signed integers.
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If |p1| and |p2| are the previous two bytes, and |mode| is current context
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mode, we calculate the context as:
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context = ContextLut(mode)[p1] | ContextLut(mode)[p2 + 256].
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For contextUTF8 mode, if the previous two bytes are ASCII characters
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(i.e. < 128), this will be equivalent to
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context = 4 * context1(p1) + context2(p2),
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where context1 is based on the previous byte in the following way:
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0 : non-ASCII control
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1 : \t, \n, \r
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2 : space
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3 : other punctuation
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4 : " '
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5 : %
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6 : ( < [ {
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7 : ) > ] }
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8 : , ; :
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9 : .
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10 : =
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11 : number
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12 : upper-case vowel
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13 : upper-case consonant
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14 : lower-case vowel
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15 : lower-case consonant
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and context2 is based on the second last byte:
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0 : control, space
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1 : punctuation
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2 : upper-case letter, number
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3 : lower-case letter
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If the last byte is ASCII, and the second last byte is not (in a valid UTF8
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stream it will be a continuation byte, value between 128 and 191), the
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context is the same as if the second last byte was an ASCII control or space.
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If the last byte is a UTF8 lead byte (value >= 192), then the next byte will
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be a continuation byte and the context id is 2 or 3 depending on the LSB of
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the last byte and to a lesser extent on the second last byte if it is ASCII.
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If the last byte is a UTF8 continuation byte, the second last byte can be:
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- continuation byte: the next byte is probably ASCII or lead byte (assuming
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4-byte UTF8 characters are rare) and the context id is 0 or 1.
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- lead byte (192 - 207): next byte is ASCII or lead byte, context is 0 or 1
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- lead byte (208 - 255): next byte is continuation byte, context is 2 or 3
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The possible value combinations of the previous two bytes, the range of
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context ids and the type of the next byte is summarized in the table below:
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|--------\-----------------------------------------------------------------|
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| \ Last byte |
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| Second \---------------------------------------------------------------|
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| last byte \ ASCII | cont. byte | lead byte |
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| \ (0-127) | (128-191) | (192-) |
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|=============|===================|=====================|==================|
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| ASCII | next: ASCII/lead | not valid | next: cont. |
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| (0-127) | context: 4 - 63 | | context: 2 - 3 |
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|-------------|-------------------|---------------------|------------------|
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| cont. byte | next: ASCII/lead | next: ASCII/lead | next: cont. |
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| (128-191) | context: 4 - 63 | context: 0 - 1 | context: 2 - 3 |
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|-------------|-------------------|---------------------|------------------|
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| lead byte | not valid | next: ASCII/lead | not valid |
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| (192-207) | | context: 0 - 1 | |
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|-------------|-------------------|---------------------|------------------|
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| lead byte | not valid | next: cont. | not valid |
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| (208-) | | context: 2 - 3 | |
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|-------------|-------------------|---------------------|------------------|
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*/
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const (
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contextLSB6 = 0
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contextMSB6 = 1
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contextUTF8 = 2
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contextSigned = 3
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)
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/* Common context lookup table for all context modes. */
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var kContextLookup = [2048]byte{
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/* CONTEXT_LSB6, last byte. */
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/* CONTEXT_LSB6, second last byte, */
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0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
|
||
|
/* CONTEXT_MSB6, last byte. */
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
6,
|
||
|
6,
|
||
|
6,
|
||
|
6,
|
||
|
7,
|
||
|
7,
|
||
|
7,
|
||
|
7,
|
||
|
8,
|
||
|
8,
|
||
|
8,
|
||
|
8,
|
||
|
9,
|
||
|
9,
|
||
|
9,
|
||
|
9,
|
||
|
10,
|
||
|
10,
|
||
|
10,
|
||
|
10,
|
||
|
11,
|
||
|
11,
|
||
|
11,
|
||
|
11,
|
||
|
12,
|
||
|
12,
|
||
|
12,
|
||
|
12,
|
||
|
13,
|
||
|
13,
|
||
|
13,
|
||
|
13,
|
||
|
14,
|
||
|
14,
|
||
|
14,
|
||
|
14,
|
||
|
15,
|
||
|
15,
|
||
|
15,
|
||
|
15,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
17,
|
||
|
17,
|
||
|
17,
|
||
|
17,
|
||
|
18,
|
||
|
18,
|
||
|
18,
|
||
|
18,
|
||
|
19,
|
||
|
19,
|
||
|
19,
|
||
|
19,
|
||
|
20,
|
||
|
20,
|
||
|
20,
|
||
|
20,
|
||
|
21,
|
||
|
21,
|
||
|
21,
|
||
|
21,
|
||
|
22,
|
||
|
22,
|
||
|
22,
|
||
|
22,
|
||
|
23,
|
||
|
23,
|
||
|
23,
|
||
|
23,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
25,
|
||
|
25,
|
||
|
25,
|
||
|
25,
|
||
|
26,
|
||
|
26,
|
||
|
26,
|
||
|
26,
|
||
|
27,
|
||
|
27,
|
||
|
27,
|
||
|
27,
|
||
|
28,
|
||
|
28,
|
||
|
28,
|
||
|
28,
|
||
|
29,
|
||
|
29,
|
||
|
29,
|
||
|
29,
|
||
|
30,
|
||
|
30,
|
||
|
30,
|
||
|
30,
|
||
|
31,
|
||
|
31,
|
||
|
31,
|
||
|
31,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
33,
|
||
|
33,
|
||
|
33,
|
||
|
33,
|
||
|
34,
|
||
|
34,
|
||
|
34,
|
||
|
34,
|
||
|
35,
|
||
|
35,
|
||
|
35,
|
||
|
35,
|
||
|
36,
|
||
|
36,
|
||
|
36,
|
||
|
36,
|
||
|
37,
|
||
|
37,
|
||
|
37,
|
||
|
37,
|
||
|
38,
|
||
|
38,
|
||
|
38,
|
||
|
38,
|
||
|
39,
|
||
|
39,
|
||
|
39,
|
||
|
39,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
41,
|
||
|
41,
|
||
|
41,
|
||
|
41,
|
||
|
42,
|
||
|
42,
|
||
|
42,
|
||
|
42,
|
||
|
43,
|
||
|
43,
|
||
|
43,
|
||
|
43,
|
||
|
44,
|
||
|
44,
|
||
|
44,
|
||
|
44,
|
||
|
45,
|
||
|
45,
|
||
|
45,
|
||
|
45,
|
||
|
46,
|
||
|
46,
|
||
|
46,
|
||
|
46,
|
||
|
47,
|
||
|
47,
|
||
|
47,
|
||
|
47,
|
||
|
48,
|
||
|
48,
|
||
|
48,
|
||
|
48,
|
||
|
49,
|
||
|
49,
|
||
|
49,
|
||
|
49,
|
||
|
50,
|
||
|
50,
|
||
|
50,
|
||
|
50,
|
||
|
51,
|
||
|
51,
|
||
|
51,
|
||
|
51,
|
||
|
52,
|
||
|
52,
|
||
|
52,
|
||
|
52,
|
||
|
53,
|
||
|
53,
|
||
|
53,
|
||
|
53,
|
||
|
54,
|
||
|
54,
|
||
|
54,
|
||
|
54,
|
||
|
55,
|
||
|
55,
|
||
|
55,
|
||
|
55,
|
||
|
56,
|
||
|
56,
|
||
|
56,
|
||
|
56,
|
||
|
57,
|
||
|
57,
|
||
|
57,
|
||
|
57,
|
||
|
58,
|
||
|
58,
|
||
|
58,
|
||
|
58,
|
||
|
59,
|
||
|
59,
|
||
|
59,
|
||
|
59,
|
||
|
60,
|
||
|
60,
|
||
|
60,
|
||
|
60,
|
||
|
61,
|
||
|
61,
|
||
|
61,
|
||
|
61,
|
||
|
62,
|
||
|
62,
|
||
|
62,
|
||
|
62,
|
||
|
63,
|
||
|
63,
|
||
|
63,
|
||
|
63,
|
||
|
|
||
|
/* CONTEXT_MSB6, second last byte, */
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
|
||
|
/* CONTEXT_UTF8, last byte. */
|
||
|
/* ASCII range. */
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
4,
|
||
|
4,
|
||
|
0,
|
||
|
0,
|
||
|
4,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
8,
|
||
|
12,
|
||
|
16,
|
||
|
12,
|
||
|
12,
|
||
|
20,
|
||
|
12,
|
||
|
16,
|
||
|
24,
|
||
|
28,
|
||
|
12,
|
||
|
12,
|
||
|
32,
|
||
|
12,
|
||
|
36,
|
||
|
12,
|
||
|
44,
|
||
|
44,
|
||
|
44,
|
||
|
44,
|
||
|
44,
|
||
|
44,
|
||
|
44,
|
||
|
44,
|
||
|
44,
|
||
|
44,
|
||
|
32,
|
||
|
32,
|
||
|
24,
|
||
|
40,
|
||
|
28,
|
||
|
12,
|
||
|
12,
|
||
|
48,
|
||
|
52,
|
||
|
52,
|
||
|
52,
|
||
|
48,
|
||
|
52,
|
||
|
52,
|
||
|
52,
|
||
|
48,
|
||
|
52,
|
||
|
52,
|
||
|
52,
|
||
|
52,
|
||
|
52,
|
||
|
48,
|
||
|
52,
|
||
|
52,
|
||
|
52,
|
||
|
52,
|
||
|
52,
|
||
|
48,
|
||
|
52,
|
||
|
52,
|
||
|
52,
|
||
|
52,
|
||
|
52,
|
||
|
24,
|
||
|
12,
|
||
|
28,
|
||
|
12,
|
||
|
12,
|
||
|
12,
|
||
|
56,
|
||
|
60,
|
||
|
60,
|
||
|
60,
|
||
|
56,
|
||
|
60,
|
||
|
60,
|
||
|
60,
|
||
|
56,
|
||
|
60,
|
||
|
60,
|
||
|
60,
|
||
|
60,
|
||
|
60,
|
||
|
56,
|
||
|
60,
|
||
|
60,
|
||
|
60,
|
||
|
60,
|
||
|
60,
|
||
|
56,
|
||
|
60,
|
||
|
60,
|
||
|
60,
|
||
|
60,
|
||
|
60,
|
||
|
24,
|
||
|
12,
|
||
|
28,
|
||
|
12,
|
||
|
0,
|
||
|
|
||
|
/* UTF8 continuation byte range. */
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
0,
|
||
|
1,
|
||
|
|
||
|
/* UTF8 lead byte range. */
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
2,
|
||
|
3,
|
||
|
|
||
|
/* CONTEXT_UTF8 second last byte. */
|
||
|
/* ASCII range. */
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
0,
|
||
|
|
||
|
/* UTF8 continuation byte range. */
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
|
||
|
/* UTF8 lead byte range. */
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
0,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
|
||
|
/* CONTEXT_SIGNED, last byte, same as the above values shifted by 3 bits. */
|
||
|
0,
|
||
|
8,
|
||
|
8,
|
||
|
8,
|
||
|
8,
|
||
|
8,
|
||
|
8,
|
||
|
8,
|
||
|
8,
|
||
|
8,
|
||
|
8,
|
||
|
8,
|
||
|
8,
|
||
|
8,
|
||
|
8,
|
||
|
8,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
16,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
24,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
32,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
40,
|
||
|
48,
|
||
|
48,
|
||
|
48,
|
||
|
48,
|
||
|
48,
|
||
|
48,
|
||
|
48,
|
||
|
48,
|
||
|
48,
|
||
|
48,
|
||
|
48,
|
||
|
48,
|
||
|
48,
|
||
|
48,
|
||
|
48,
|
||
|
56,
|
||
|
|
||
|
/* CONTEXT_SIGNED, second last byte. */
|
||
|
0,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
1,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
2,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
3,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
4,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
5,
|
||
|
6,
|
||
|
6,
|
||
|
6,
|
||
|
6,
|
||
|
6,
|
||
|
6,
|
||
|
6,
|
||
|
6,
|
||
|
6,
|
||
|
6,
|
||
|
6,
|
||
|
6,
|
||
|
6,
|
||
|
6,
|
||
|
6,
|
||
|
7,
|
||
|
}
|
||
|
|
||
|
type contextLUT []byte
|
||
|
|
||
|
func getContextLUT(mode int) contextLUT {
|
||
|
return kContextLookup[mode<<9:]
|
||
|
}
|
||
|
|
||
|
func getContext(p1 byte, p2 byte, lut contextLUT) byte {
|
||
|
return lut[p1] | lut[256+int(p2)]
|
||
|
}
|