|
1 | | -const ECLevel = require('./error-correction-level') |
2 | | - |
3 | | -const EC_BLOCKS_TABLE = [ |
4 | | -// L M Q H |
5 | | - 1, 1, 1, 1, |
6 | | - 1, 1, 1, 1, |
7 | | - 1, 1, 2, 2, |
8 | | - 1, 2, 2, 4, |
9 | | - 1, 2, 4, 4, |
10 | | - 2, 4, 4, 4, |
11 | | - 2, 4, 6, 5, |
12 | | - 2, 4, 6, 6, |
13 | | - 2, 5, 8, 8, |
14 | | - 4, 5, 8, 8, |
15 | | - 4, 5, 8, 11, |
16 | | - 4, 8, 10, 11, |
17 | | - 4, 9, 12, 16, |
18 | | - 4, 9, 16, 16, |
19 | | - 6, 10, 12, 18, |
20 | | - 6, 10, 17, 16, |
21 | | - 6, 11, 16, 19, |
22 | | - 6, 13, 18, 21, |
23 | | - 7, 14, 21, 25, |
24 | | - 8, 16, 20, 25, |
25 | | - 8, 17, 23, 25, |
26 | | - 9, 17, 23, 34, |
27 | | - 9, 18, 25, 30, |
28 | | - 10, 20, 27, 32, |
29 | | - 12, 21, 29, 35, |
30 | | - 12, 23, 34, 37, |
31 | | - 12, 25, 34, 40, |
32 | | - 13, 26, 35, 42, |
33 | | - 14, 28, 38, 45, |
34 | | - 15, 29, 40, 48, |
35 | | - 16, 31, 43, 51, |
36 | | - 17, 33, 45, 54, |
37 | | - 18, 35, 48, 57, |
38 | | - 19, 37, 51, 60, |
39 | | - 19, 38, 53, 63, |
40 | | - 20, 40, 56, 66, |
41 | | - 21, 43, 59, 70, |
42 | | - 22, 45, 62, 74, |
43 | | - 24, 47, 65, 77, |
44 | | - 25, 49, 68, 81 |
45 | | -] |
46 | | - |
47 | | -const EC_CODEWORDS_TABLE = [ |
48 | | -// L M Q H |
49 | | - 7, 10, 13, 17, |
50 | | - 10, 16, 22, 28, |
51 | | - 15, 26, 36, 44, |
52 | | - 20, 36, 52, 64, |
53 | | - 26, 48, 72, 88, |
54 | | - 36, 64, 96, 112, |
55 | | - 40, 72, 108, 130, |
56 | | - 48, 88, 132, 156, |
57 | | - 60, 110, 160, 192, |
58 | | - 72, 130, 192, 224, |
59 | | - 80, 150, 224, 264, |
60 | | - 96, 176, 260, 308, |
61 | | - 104, 198, 288, 352, |
62 | | - 120, 216, 320, 384, |
63 | | - 132, 240, 360, 432, |
64 | | - 144, 280, 408, 480, |
65 | | - 168, 308, 448, 532, |
66 | | - 180, 338, 504, 588, |
67 | | - 196, 364, 546, 650, |
68 | | - 224, 416, 600, 700, |
69 | | - 224, 442, 644, 750, |
70 | | - 252, 476, 690, 816, |
71 | | - 270, 504, 750, 900, |
72 | | - 300, 560, 810, 960, |
73 | | - 312, 588, 870, 1050, |
74 | | - 336, 644, 952, 1110, |
75 | | - 360, 700, 1020, 1200, |
76 | | - 390, 728, 1050, 1260, |
77 | | - 420, 784, 1140, 1350, |
78 | | - 450, 812, 1200, 1440, |
79 | | - 480, 868, 1290, 1530, |
80 | | - 510, 924, 1350, 1620, |
81 | | - 540, 980, 1440, 1710, |
82 | | - 570, 1036, 1530, 1800, |
83 | | - 570, 1064, 1590, 1890, |
84 | | - 600, 1120, 1680, 1980, |
85 | | - 630, 1204, 1770, 2100, |
86 | | - 660, 1260, 1860, 2220, |
87 | | - 720, 1316, 1950, 2310, |
88 | | - 750, 1372, 2040, 2430 |
89 | | -] |
90 | | - |
91 | | -/** |
92 | | - * Returns the number of error correction block that the QR Code should contain |
93 | | - * for the specified version and error correction level. |
94 | | - * |
95 | | - * @param {Number} version QR Code version |
96 | | - * @param {Number} errorCorrectionLevel Error correction level |
97 | | - * @return {Number} Number of error correction blocks |
98 | | - */ |
99 | | -exports.getBlocksCount = function getBlocksCount (version, errorCorrectionLevel) { |
100 | | - switch (errorCorrectionLevel) { |
101 | | - case ECLevel.L: |
102 | | - return EC_BLOCKS_TABLE[(version - 1) * 4 + 0] |
103 | | - case ECLevel.M: |
104 | | - return EC_BLOCKS_TABLE[(version - 1) * 4 + 1] |
105 | | - case ECLevel.Q: |
106 | | - return EC_BLOCKS_TABLE[(version - 1) * 4 + 2] |
107 | | - case ECLevel.H: |
108 | | - return EC_BLOCKS_TABLE[(version - 1) * 4 + 3] |
109 | | - default: |
110 | | - return undefined |
111 | | - } |
112 | | -} |
113 | | - |
114 | | -/** |
115 | | - * Returns the number of error correction codewords to use for the specified |
116 | | - * version and error correction level. |
117 | | - * |
118 | | - * @param {Number} version QR Code version |
119 | | - * @param {Number} errorCorrectionLevel Error correction level |
120 | | - * @return {Number} Number of error correction codewords |
121 | | - */ |
122 | | -exports.getTotalCodewordsCount = function getTotalCodewordsCount (version, errorCorrectionLevel) { |
123 | | - switch (errorCorrectionLevel) { |
124 | | - case ECLevel.L: |
125 | | - return EC_CODEWORDS_TABLE[(version - 1) * 4 + 0] |
126 | | - case ECLevel.M: |
127 | | - return EC_CODEWORDS_TABLE[(version - 1) * 4 + 1] |
128 | | - case ECLevel.Q: |
129 | | - return EC_CODEWORDS_TABLE[(version - 1) * 4 + 2] |
130 | | - case ECLevel.H: |
131 | | - return EC_CODEWORDS_TABLE[(version - 1) * 4 + 3] |
132 | | - default: |
133 | | - return undefined |
134 | | - } |
135 | | -} |
| 1 | +const ECLevel = require('./error-correction-level') |
| 2 | + |
| 3 | +const EC_BLOCKS_TABLE = [ |
| 4 | +// L M Q H |
| 5 | + 1, 1, 1, 1, |
| 6 | + 1, 1, 1, 1, |
| 7 | + 1, 1, 2, 2, |
| 8 | + 1, 2, 2, 4, |
| 9 | + 1, 2, 4, 4, |
| 10 | + 2, 4, 4, 4, |
| 11 | + 2, 4, 6, 5, |
| 12 | + 2, 4, 6, 6, |
| 13 | + 2, 5, 8, 8, |
| 14 | + 4, 5, 8, 8, |
| 15 | + 4, 5, 8, 11, |
| 16 | + 4, 8, 10, 11, |
| 17 | + 4, 9, 12, 16, |
| 18 | + 4, 9, 16, 16, |
| 19 | + 6, 10, 12, 18, |
| 20 | + 6, 10, 17, 16, |
| 21 | + 6, 11, 16, 19, |
| 22 | + 6, 13, 18, 21, |
| 23 | + 7, 14, 21, 25, |
| 24 | + 8, 16, 20, 25, |
| 25 | + 8, 17, 23, 25, |
| 26 | + 9, 17, 23, 34, |
| 27 | + 9, 18, 25, 30, |
| 28 | + 10, 20, 27, 32, |
| 29 | + 12, 21, 29, 35, |
| 30 | + 12, 23, 34, 37, |
| 31 | + 12, 25, 34, 40, |
| 32 | + 13, 26, 35, 42, |
| 33 | + 14, 28, 38, 45, |
| 34 | + 15, 29, 40, 48, |
| 35 | + 16, 31, 43, 51, |
| 36 | + 17, 33, 45, 54, |
| 37 | + 18, 35, 48, 57, |
| 38 | + 19, 37, 51, 60, |
| 39 | + 19, 38, 53, 63, |
| 40 | + 20, 40, 56, 66, |
| 41 | + 21, 43, 59, 70, |
| 42 | + 22, 45, 62, 74, |
| 43 | + 24, 47, 65, 77, |
| 44 | + 25, 49, 68, 81 |
| 45 | +] |
| 46 | + |
| 47 | +const EC_CODEWORDS_TABLE = [ |
| 48 | +// L M Q H |
| 49 | + 7, 10, 13, 17, |
| 50 | + 10, 16, 22, 28, |
| 51 | + 15, 26, 36, 44, |
| 52 | + 20, 36, 52, 64, |
| 53 | + 26, 48, 72, 88, |
| 54 | + 36, 64, 96, 112, |
| 55 | + 40, 72, 108, 130, |
| 56 | + 48, 88, 132, 156, |
| 57 | + 60, 110, 160, 192, |
| 58 | + 72, 130, 192, 224, |
| 59 | + 80, 150, 224, 264, |
| 60 | + 96, 176, 260, 308, |
| 61 | + 104, 198, 288, 352, |
| 62 | + 120, 216, 320, 384, |
| 63 | + 132, 240, 360, 432, |
| 64 | + 144, 280, 408, 480, |
| 65 | + 168, 308, 448, 532, |
| 66 | + 180, 338, 504, 588, |
| 67 | + 196, 364, 546, 650, |
| 68 | + 224, 416, 600, 700, |
| 69 | + 224, 442, 644, 750, |
| 70 | + 252, 476, 690, 816, |
| 71 | + 270, 504, 750, 900, |
| 72 | + 300, 560, 810, 960, |
| 73 | + 312, 588, 870, 1050, |
| 74 | + 336, 644, 952, 1110, |
| 75 | + 360, 700, 1020, 1200, |
| 76 | + 390, 728, 1050, 1260, |
| 77 | + 420, 784, 1140, 1350, |
| 78 | + 450, 812, 1200, 1440, |
| 79 | + 480, 868, 1290, 1530, |
| 80 | + 510, 924, 1350, 1620, |
| 81 | + 540, 980, 1440, 1710, |
| 82 | + 570, 1036, 1530, 1800, |
| 83 | + 570, 1064, 1590, 1890, |
| 84 | + 600, 1120, 1680, 1980, |
| 85 | + 630, 1204, 1770, 2100, |
| 86 | + 660, 1260, 1860, 2220, |
| 87 | + 720, 1316, 1950, 2310, |
| 88 | + 750, 1372, 2040, 2430 |
| 89 | +] |
| 90 | + |
| 91 | +/** |
| 92 | + * Returns the number of error correction block that the QR Code should contain |
| 93 | + * for the specified version and error correction level. |
| 94 | + * |
| 95 | + * @param {Number} version QR Code version |
| 96 | + * @param {Number} errorCorrectionLevel Error correction level |
| 97 | + * @return {Number} Number of error correction blocks |
| 98 | + */ |
| 99 | +exports.getBlocksCount = function getBlocksCount (version, errorCorrectionLevel) { |
| 100 | + switch (errorCorrectionLevel) { |
| 101 | + case ECLevel.L: |
| 102 | + return EC_BLOCKS_TABLE[(version - 1) * 4 + 0] |
| 103 | + case ECLevel.M: |
| 104 | + return EC_BLOCKS_TABLE[(version - 1) * 4 + 1] |
| 105 | + case ECLevel.Q: |
| 106 | + return EC_BLOCKS_TABLE[(version - 1) * 4 + 2] |
| 107 | + case ECLevel.H: |
| 108 | + return EC_BLOCKS_TABLE[(version - 1) * 4 + 3] |
| 109 | + default: |
| 110 | + return undefined |
| 111 | + } |
| 112 | +} |
| 113 | + |
| 114 | +/** |
| 115 | + * Returns the number of error correction codewords to use for the specified |
| 116 | + * version and error correction level. |
| 117 | + * |
| 118 | + * @param {Number} version QR Code version |
| 119 | + * @param {Number} errorCorrectionLevel Error correction level |
| 120 | + * @return {Number} Number of error correction codewords |
| 121 | + */ |
| 122 | +exports.getTotalCodewordsCount = function getTotalCodewordsCount (version, errorCorrectionLevel) { |
| 123 | + switch (errorCorrectionLevel) { |
| 124 | + case ECLevel.L: |
| 125 | + return EC_CODEWORDS_TABLE[(version - 1) * 4 + 0] |
| 126 | + case ECLevel.M: |
| 127 | + return EC_CODEWORDS_TABLE[(version - 1) * 4 + 1] |
| 128 | + case ECLevel.Q: |
| 129 | + return EC_CODEWORDS_TABLE[(version - 1) * 4 + 2] |
| 130 | + case ECLevel.H: |
| 131 | + return EC_CODEWORDS_TABLE[(version - 1) * 4 + 3] |
| 132 | + default: |
| 133 | + return undefined |
| 134 | + } |
| 135 | +} |
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