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1 // Copyright 2014 PDFium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com | |
6 // Original code is licensed as follows: | |
7 /* | |
8 * Copyright 2012 ZXing authors | |
9 * | |
10 * Licensed under the Apache License, Version 2.0 (the "License"); | |
11 * you may not use this file except in compliance with the License. | |
12 * You may obtain a copy of the License at | |
13 * | |
14 * http://www.apache.org/licenses/LICENSE-2.0 | |
15 * | |
16 * Unless required by applicable law or agreed to in writing, software | |
17 * distributed under the License is distributed on an "AS IS" BASIS, | |
18 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
19 * See the License for the specific language governing permissions and | |
20 * limitations under the License. | |
21 */ | |
22 | |
23 #include "barcode.h" | |
24 #include "include/BC_PDF417Common.h" | |
25 #include "include/BC_PDF417ECModulusPoly.h" | |
26 #include "include/BC_PDF417ECModulusGF.h" | |
27 CBC_PDF417ECModulusGF* CBC_PDF417ECModulusGF::PDF417_GF = NULL; | |
28 void CBC_PDF417ECModulusGF::Initialize(FX_INT32 &e) | |
29 { | |
30 PDF417_GF = FX_NEW CBC_PDF417ECModulusGF(CBC_PDF417Common::NUMBER_OF_CODEWOR
DS, 3, e); | |
31 } | |
32 void CBC_PDF417ECModulusGF::Finalize() | |
33 { | |
34 delete PDF417_GF; | |
35 } | |
36 CBC_PDF417ECModulusGF::CBC_PDF417ECModulusGF(FX_INT32 modulus, FX_INT32 generato
r, FX_INT32 &e) | |
37 { | |
38 m_modulus = modulus; | |
39 m_expTable.SetSize(modulus); | |
40 m_logTable.SetSize(modulus); | |
41 FX_INT32 x = 1; | |
42 for (FX_INT32 i = 0; i < modulus; i++) { | |
43 m_expTable[i] = x; | |
44 x = (x * generator) % modulus; | |
45 } | |
46 for (FX_INT32 j = 0; j < modulus - 1; j++) { | |
47 m_logTable[m_expTable[j]] = j; | |
48 } | |
49 CFX_Int32Array zero; | |
50 zero.Add(0); | |
51 m_zero = FX_NEW CBC_PDF417ECModulusPoly(this, zero, e); | |
52 CFX_Int32Array one; | |
53 one.Add(1); | |
54 m_one = FX_NEW CBC_PDF417ECModulusPoly(this, one, e); | |
55 } | |
56 CBC_PDF417ECModulusGF::~CBC_PDF417ECModulusGF() | |
57 { | |
58 delete m_zero; | |
59 delete m_one; | |
60 } | |
61 CBC_PDF417ECModulusPoly* CBC_PDF417ECModulusGF::getZero() | |
62 { | |
63 return m_zero; | |
64 } | |
65 CBC_PDF417ECModulusPoly* CBC_PDF417ECModulusGF::getOne() | |
66 { | |
67 return m_one; | |
68 } | |
69 CBC_PDF417ECModulusPoly* CBC_PDF417ECModulusGF::buildMonomial(FX_INT32 degree, F
X_INT32 coefficient, FX_INT32 &e) | |
70 { | |
71 if (degree < 0) { | |
72 e = BCExceptionIllegalArgument; | |
73 return NULL; | |
74 } | |
75 CBC_PDF417ECModulusPoly* modulusPoly = NULL; | |
76 if (coefficient == 0) { | |
77 modulusPoly = FX_NEW CBC_PDF417ECModulusPoly(m_zero->getField(), m_zero-
>getCoefficients(), e); | |
78 BC_EXCEPTION_CHECK_ReturnValue(e, NULL); | |
79 return modulusPoly; | |
80 } | |
81 CFX_Int32Array coefficients; | |
82 coefficients.SetSize(degree + 1); | |
83 coefficients[0] = coefficient; | |
84 modulusPoly = FX_NEW CBC_PDF417ECModulusPoly(this, coefficients, e); | |
85 BC_EXCEPTION_CHECK_ReturnValue(e, NULL); | |
86 return modulusPoly; | |
87 } | |
88 FX_INT32 CBC_PDF417ECModulusGF::add(FX_INT32 a, FX_INT32 b) | |
89 { | |
90 return (a + b) % m_modulus; | |
91 } | |
92 FX_INT32 CBC_PDF417ECModulusGF::subtract(FX_INT32 a, FX_INT32 b) | |
93 { | |
94 return (m_modulus + a - b) % m_modulus; | |
95 } | |
96 FX_INT32 CBC_PDF417ECModulusGF::exp(FX_INT32 a) | |
97 { | |
98 return m_expTable[a]; | |
99 } | |
100 FX_INT32 CBC_PDF417ECModulusGF::log(FX_INT32 a, FX_INT32 &e) | |
101 { | |
102 if (a == 0) { | |
103 e = BCExceptionIllegalArgument; | |
104 return -1; | |
105 } | |
106 return m_logTable[a]; | |
107 } | |
108 FX_INT32 CBC_PDF417ECModulusGF::inverse(FX_INT32 a, FX_INT32 &e) | |
109 { | |
110 if (a == 0) { | |
111 e = BCExceptionIllegalArgument; | |
112 return -1; | |
113 } | |
114 return m_expTable[m_modulus - m_logTable[a] - 1]; | |
115 } | |
116 FX_INT32 CBC_PDF417ECModulusGF::multiply(FX_INT32 a, FX_INT32 b) | |
117 { | |
118 if (a == 0 || b == 0) { | |
119 return 0; | |
120 } | |
121 return m_expTable[(m_logTable[a] + m_logTable[b]) % (m_modulus - 1)]; | |
122 } | |
123 FX_INT32 CBC_PDF417ECModulusGF::getSize() | |
124 { | |
125 return m_modulus; | |
126 } | |
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