Mercurial > dovecot > core-2.2
annotate src/lib/base32.c @ 22955:812e5c961328
fts: Indexing virtual mailbox didn't always index the last mails
author | Timo Sirainen <timo.sirainen@dovecot.fi> |
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date | Thu, 03 May 2018 18:33:00 +0300 |
parents | cb108f786fb4 |
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rev | line source |
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cb108f786fb4
Updated copyright notices to include the year 2018.
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1 /* Copyright (c) 2007-2018 Dovecot authors, see the included COPYING file */ |
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2 |
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3 #include "lib.h" |
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4 #include "base32.h" |
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5 #include "buffer.h" |
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6 |
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7 static const char b32enc[] = |
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8 "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567"; |
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9 |
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10 static const char b32hexenc[] = |
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11 "0123456789ABCDEFGHIJKLMNOPQRSTUV"; |
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12 |
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13 static const unsigned char b32dec[256] = { |
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14 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0-7 */ |
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15 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 8-15 */ |
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16 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 16-23 */ |
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17 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 24-31 */ |
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18 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 32-39 */ |
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19 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 40-47 */ |
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20 0xff, 0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 48-55 */ |
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21 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 56-63 */ |
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22 0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, /* 64-71 */ |
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23 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, /* 72-79 */ |
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24 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, /* 80-87 */ |
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25 0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff, /* 88-95 */ |
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26 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 96-103 */ |
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27 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 104-111 */ |
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28 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 112-119 */ |
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29 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 120-127 */ |
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30 |
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31 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 128-255 */ |
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32 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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33 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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34 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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35 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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36 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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37 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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38 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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39 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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40 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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41 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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42 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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43 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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44 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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45 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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46 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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47 }; |
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48 |
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49 static const unsigned char b32hexdec[256] = { |
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50 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0-7 */ |
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51 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 8-15 */ |
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52 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 16-23 */ |
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53 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 24-31 */ |
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54 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 32-39 */ |
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55 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 40-47 */ |
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56 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 48-55 */ |
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57 0x08, 0x09, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 56-63 */ |
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58 0xff, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, /* 64-71 */ |
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59 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, /* 72-79 */ |
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60 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0xff, /* 80-87 */ |
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61 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 88-95 */ |
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62 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 96-103 */ |
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63 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 104-111 */ |
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64 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 112-119 */ |
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65 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 120-127 */ |
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66 |
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67 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 128-255 */ |
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68 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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69 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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70 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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71 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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72 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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73 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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74 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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75 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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76 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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77 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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78 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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79 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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80 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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81 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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82 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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83 }; |
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84 |
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85 static void |
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86 base32_encode_with_alphabet(const char *alph, |
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87 bool pad, const void *src, size_t src_size, buffer_t *dest) |
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88 { |
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89 const unsigned char *src_c = src; |
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90 unsigned char tmp[8], endb; |
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91 size_t src_pos; |
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92 |
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93 /* [5 3][2 5 1][4 4][1 5 2][3 5] |
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94 (5)(3 2)(5)(1 4)(4 1)(5)(2 3)(5) |
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95 */ |
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96 |
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97 /* encode main part */ |
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98 for (src_pos = 0; src_pos + 4 < src_size; src_pos += 5) { |
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99 tmp[0] = alph[src_c[src_pos] >> 3]; |
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100 tmp[1] = alph[((src_c[src_pos] & 0x07) << 2) | |
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101 ((src_c[src_pos+1] >> 6) & 0x03)]; |
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102 tmp[2] = alph[((src_c[src_pos+1] >> 1) & 0x1f)]; |
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103 tmp[3] = alph[((src_c[src_pos+1] & 0x01) << 4) | |
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104 (src_c[src_pos+2] >> 4)]; |
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105 tmp[4] = alph[((src_c[src_pos+2] & 0x0f) << 1) | |
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106 (src_c[src_pos+3] >> 7)]; |
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107 tmp[5] = alph[((src_c[src_pos+3] >> 2) & 0x1f)]; |
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108 tmp[6] = alph[((src_c[src_pos+3] & 0x03) << 3) | |
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109 (src_c[src_pos+4] >> 5)]; |
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110 tmp[7] = alph[src_c[src_pos+4] & 0x1f]; |
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111 buffer_append(dest, tmp, 8); |
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112 } |
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113 |
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114 /* encode last < 5 bytes if any */ |
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115 if (src_pos < src_size) { |
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116 tmp[0] = alph[src_c[src_pos] >> 3]; |
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117 switch (src_size - src_pos) { |
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118 case 1: |
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119 tmp[1] = alph[((src_c[src_pos] & 0x07) << 2)]; |
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120 endb = 2; |
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121 break; |
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122 case 2: |
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123 tmp[1] = alph[((src_c[src_pos] & 0x07) << 2) | |
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124 ((src_c[src_pos+1] >> 6) & 0x03)]; |
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125 tmp[2] = alph[((src_c[src_pos+1] >> 1) & 0x1f)]; |
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126 tmp[3] = alph[((src_c[src_pos+1] & 0x01) << 4)]; |
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127 endb = 4; |
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128 break; |
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129 case 3: |
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130 tmp[1] = alph[((src_c[src_pos] & 0x07) << 2) | |
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131 ((src_c[src_pos+1] >> 6) & 0x03)]; |
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132 tmp[2] = alph[((src_c[src_pos+1] >> 1) & 0x1f)]; |
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133 tmp[3] = alph[((src_c[src_pos+1] & 0x01) << 4) | |
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134 (src_c[src_pos+2] >> 4)]; |
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135 tmp[4] = alph[((src_c[src_pos+2] & 0x0f) << 1)]; |
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136 endb = 5; |
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137 break; |
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138 case 4: |
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139 tmp[1] = alph[((src_c[src_pos] & 0x07) << 2) | |
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140 ((src_c[src_pos+1] >> 6) & 0x03)]; |
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141 tmp[2] = alph[((src_c[src_pos+1] >> 1) & 0x1f)]; |
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142 tmp[3] = alph[((src_c[src_pos+1] & 0x01) << 4) | |
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143 (src_c[src_pos+2] >> 4)]; |
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144 tmp[4] = alph[((src_c[src_pos+2] & 0x0f) << 1) | |
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145 (src_c[src_pos+3] >> 7)]; |
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146 tmp[5] = alph[((src_c[src_pos+3] >> 2) & 0x1f)]; |
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147 tmp[6] = alph[((src_c[src_pos+3] & 0x03) << 3)]; |
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148 endb = 7; |
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149 break; |
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150 default: |
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151 i_unreached(); |
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152 } |
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153 |
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154 /* add padding if required */ |
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155 if (pad) { |
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156 memset(&tmp[endb], '=', sizeof(tmp)-endb); |
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157 buffer_append(dest, tmp, 8); |
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158 } else { |
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159 buffer_append(dest, tmp, endb); |
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160 } |
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161 } |
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162 } |
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163 |
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164 void base32_encode(bool pad, const void *src, size_t src_size, |
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165 buffer_t *dest) |
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166 { |
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167 base32_encode_with_alphabet(b32enc, pad, src, src_size, dest); |
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168 } |
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169 |
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170 void base32hex_encode(bool pad, const void *src, size_t src_size, |
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171 buffer_t *dest) |
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172 { |
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173 base32_encode_with_alphabet(b32hexenc, pad, src, src_size, dest); |
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174 } |
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175 |
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176 #define IS_EMPTY(c) \ |
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177 ((c) == '\n' || (c) == '\r' || (c) == ' ' || (c) == '\t') |
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178 |
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179 static int |
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180 base32_decode_with_alphabet(const unsigned char *alph, |
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181 const void *src, size_t src_size, size_t *src_pos_r, |
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182 buffer_t *dest) |
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183 { |
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184 const unsigned char *src_c = src; |
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185 size_t block_pos, src_pos; |
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186 unsigned char output[5], ipos, opos; |
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187 int ret = 1; |
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188 |
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189 /* (5)(3 2)(5)(1 4)(4 1)(5)(2 3)(5) |
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190 [5 3][2 5 1][4 4][1 5 2][3 5] |
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191 */ |
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192 ipos = opos = 0; |
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|
193 block_pos = 0; |
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194 for (src_pos = 0; src_pos < src_size; src_pos++) { |
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195 unsigned char input = alph[src_c[src_pos]]; |
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196 |
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197 if (input == 0xff) { |
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198 if (unlikely(!IS_EMPTY(src_c[src_pos]))) |
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|
199 break; |
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|
200 continue; |
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|
201 } |
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|
202 |
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|
203 ipos++; |
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|
204 switch (ipos) { |
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|
205 case 1: |
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206 output[0] = input << 3; |
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207 opos = 0; |
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208 break; |
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|
209 case 2: |
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|
210 output[0] |= input >> 2; |
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211 output[1] = (input & 0x03) << 6; |
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212 opos = 1; |
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|
213 break; |
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|
214 case 3: |
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|
215 output[1] |= input << 1; |
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216 opos = 1; |
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217 break; |
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218 case 4: |
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219 output[1] |= input >> 4; |
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220 output[2] = (input & 0x0f) << 4; |
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221 opos = 2; |
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|
222 break; |
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|
223 case 5: |
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|
224 output[2] |= input >> 1; |
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225 output[3] = (input & 0x01) << 7; |
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226 opos = 3; |
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|
227 break; |
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228 case 6: |
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229 output[3] |= input << 2; |
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230 opos = 3; |
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231 break; |
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232 case 7: |
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233 output[3] |= input >> 3; |
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234 output[4] = ((input & 0x07) << 5); |
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235 opos = 4; |
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236 break; |
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237 case 8: |
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238 output[4] |= input; |
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239 buffer_append(dest, output, 5); |
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240 ipos = 0; |
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241 opos = 0; |
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242 block_pos = src_pos; |
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243 break; |
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244 default: |
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245 i_unreached(); |
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246 } |
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247 } |
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248 |
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249 if (ipos > 0) { |
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250 for (; src_pos < src_size; src_pos++) { |
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251 if (src_c[src_pos] != '=') { |
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252 if (unlikely(!IS_EMPTY(src_c[src_pos]))) { |
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253 ret = -1; |
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254 break; |
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255 } |
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256 continue; |
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257 } |
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258 if (++ipos >= 8) { |
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259 buffer_append(dest, output, opos); |
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260 ipos = 0; |
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261 ret = 0; |
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262 src_pos++; |
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263 break; |
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264 } |
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265 } |
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266 } |
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267 |
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268 if (src_pos_r != NULL) { |
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269 if (ipos == 0) { |
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270 for (; src_pos < src_size; src_pos++) { |
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271 if (!IS_EMPTY(src_c[src_pos])) |
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272 break; |
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273 } |
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274 |
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275 *src_pos_r = src_pos; |
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276 } else { |
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277 *src_pos_r = block_pos; |
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278 } |
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279 } |
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280 return ret; |
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281 } |
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282 |
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283 int base32_decode(const void *src, size_t src_size, |
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284 size_t *src_pos_r, buffer_t *dest) |
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285 { |
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286 return base32_decode_with_alphabet |
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287 (b32dec, src, src_size, src_pos_r, dest); |
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288 } |
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289 int base32hex_decode(const void *src, size_t src_size, |
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290 size_t *src_pos_r, buffer_t *dest) |
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291 { |
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292 return base32_decode_with_alphabet |
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293 (b32hexdec, src, src_size, src_pos_r, dest); |
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294 } |
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295 |
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296 buffer_t *t_base32_decode_str(const char *str) |
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297 { |
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298 buffer_t *buf; |
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299 size_t len = strlen(str); |
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300 |
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301 buf = buffer_create_dynamic(pool_datastack_create(), |
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302 MAX_BASE32_DECODED_SIZE(len)); |
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303 (void)base32_decode(str, len, NULL, buf); |
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304 return buf; |
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305 } |
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306 |
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307 buffer_t *t_base32hex_decode_str(const char *str) |
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308 { |
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309 buffer_t *buf; |
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310 size_t len = strlen(str); |
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311 |
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312 buf = buffer_create_dynamic(pool_datastack_create(), |
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313 MAX_BASE32_DECODED_SIZE(len)); |
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314 (void)base32hex_decode(str, len, NULL, buf); |
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315 return buf; |
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316 } |
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317 |
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318 bool base32_is_valid_char(char c) |
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319 { |
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320 return b32dec[(uint8_t)c] != 0xff; |
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321 } |
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322 |
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323 bool base32hex_is_valid_char(char c) |
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324 { |
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325 return b32hexdec[(uint8_t)c] != 0xff; |
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326 } |