Mercurial > forge
annotate main/database/src/converters.h @ 11460:9ef769abf53d octave-forge
Fix segfault reported by Richard <richard@mail.sheugh.com>, due to undefined order of initialization.
author | i7tiol |
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date | Mon, 18 Feb 2013 20:48:19 +0000 |
parents | 61ea672a060a |
children | 4fd39d36eff5 |
rev | line source |
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1 /* |
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2 |
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3 Copyright (C) 2012, 2013 Olaf Till <i7tiol@t-online.de> |
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4 |
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5 This program is free software; you can redistribute it and/or modify |
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6 it under the terms of the GNU General Public License as published by |
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7 the Free Software Foundation; either version 3 of the License, or |
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8 (at your option) any later version. |
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9 |
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10 This program is distributed in the hope that it will be useful, |
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 GNU General Public License for more details. |
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14 |
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15 You should have received a copy of the GNU General Public License |
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16 along with this program; If not, see <http://www.gnu.org/licenses/>. |
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17 |
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18 */ |
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19 |
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20 #ifndef __OCT_PQ_CONVERTERS__ |
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21 |
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22 #define __OCT_PQ_CONVERTERS__ |
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23 |
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24 #include <octave/oct.h> |
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25 |
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26 #include <stdint.h> |
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27 #include <endian.h> |
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28 |
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29 #include <vector> |
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30 #include <string> |
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31 |
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32 #include <postgresql/libpq-fe.h> |
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33 |
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34 #define OCT_PQ_NUM_CONVERTERS 13 |
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35 |
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36 typedef std::vector<char> oct_pq_dynvec_t; |
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37 |
11409 | 38 typedef int (*oct_pq_to_octave_fp_t) (const char *, octave_value &, int); |
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39 |
11407 | 40 typedef int (*oct_pq_from_octave_fp_t) (const octave_value &, oct_pq_dynvec_t &); |
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41 |
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42 // some objects will be constants, some will be allocated |
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43 typedef struct |
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44 { |
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45 Oid oid; // read from server |
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46 Oid aoid; // array oid // read from server |
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47 Oid relid; // pg_attribute.attrelid, zero for non-composite types |
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48 bool is_composite; // false for constant objects |
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49 bool is_enum; // false for constant objects |
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50 bool is_not_constant; // false for constant objects |
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51 // const char *name; not all constants, use std::string |
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52 std::string name; |
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53 oct_pq_to_octave_fp_t to_octave_str; |
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54 oct_pq_to_octave_fp_t to_octave_bin; |
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55 oct_pq_from_octave_fp_t from_octave_str; |
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56 oct_pq_from_octave_fp_t from_octave_bin; |
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57 } |
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58 oct_pq_conv_t; |
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59 |
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60 std::string &pq_basetype_prefix (void); |
11429 | 61 |
62 // a wrapper class for array of pointers to converters which qualifies | |
63 // base type names in initialization | |
64 class oct_pq_conv_ptrs_t | |
65 { | |
66 public: | |
67 | |
68 oct_pq_conv_ptrs_t (int n, oct_pq_conv_t **ptrs) : converters (ptrs) | |
69 { | |
70 for (int i = 0; i < n; i++) | |
71 { | |
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72 std::string prefix = pq_basetype_prefix (); |
11429 | 73 |
74 converters[i]->name = prefix.append (converters[i]->name); | |
75 } | |
76 } | |
77 | |
78 oct_pq_conv_t *operator[] (int i) { return converters[i]; } | |
79 | |
80 private: | |
81 | |
82 oct_pq_conv_t **converters; | |
83 }; | |
84 | |
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85 // a wrapper class around oct_pq_conv_t* to provide a default |
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86 // constructor which nullifies it, for efficient use of maps, where |
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87 // checking for the presence of a key while inserting it can rely on a |
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88 // newly generated key mapping to a value of NULL |
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89 class oct_pq_conv_wrapper_t |
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90 { |
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91 public: |
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92 |
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93 oct_pq_conv_wrapper_t (void) : conv (NULL) {} |
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94 |
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95 oct_pq_conv_wrapper_t (oct_pq_conv_t *c) : conv (c) {} |
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96 |
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97 operator oct_pq_conv_t *&(void) { return conv; } |
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98 |
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99 oct_pq_conv_t *&operator->(void) { return conv; } |
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100 |
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101 private: |
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102 |
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103 oct_pq_conv_t *conv; |
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104 }; |
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105 |
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106 // helper function for debugging |
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107 void print_conv (oct_pq_conv_t *); |
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108 |
11429 | 109 extern oct_pq_conv_ptrs_t conv_ptrs; |
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110 |
11410 | 111 // these prototypes are needed because pointers to these functions are |
112 // stored in the converter structures of each found enum type | |
113 int to_octave_str_text (const char *c, octave_value &ov, int nb); | |
114 int to_octave_bin_text (const char *c, octave_value &ov, int nb); | |
115 int from_octave_str_text (const octave_value &ov, oct_pq_dynvec_t &val); | |
116 int from_octave_bin_text (const octave_value &ov, oct_pq_dynvec_t &val); | |
117 | |
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118 // append bytes of value 'val' of type 'type' to dynamic char vector 'dv' |
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119 #define OCT_PQ_PUT(dv, type, val) \ |
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120 dv.resize (dv.size () + sizeof (type)); \ |
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121 *((type *) &(dv.end ()[-sizeof (type)])) = val; |
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122 |
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123 // increase size of dynamic char vector 'dv' by size of uint32 and |
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124 // store the new size in a variable named 'var' of octave_idx_type; |
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125 // after further increasing 'dv', OCT_PQ_FILL_UINT32_PLACEHOLDER |
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126 // should be used with equal arguments |
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127 #define OCT_PQ_SET_UINT32_PLACEHOLDER(dv, var) \ |
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128 octave_idx_type var = dv.size () + sizeof (uint32_t); \ |
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129 dv.resize (var); |
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130 // to be used after OCT_PQ_SET_UINT32_PLACEHOLDER with equal |
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131 // arguments; calculate difference between current size of dynamic |
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132 // char vector 'dv' and a previous size stored in a variable named |
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133 // 'var', and write this difference, converted to uint32_t in network |
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134 // byte order, to the placeholder within 'dv' just before the position |
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135 // stored in 'var' |
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136 #define OCT_PQ_FILL_UINT32_PLACEHOLDER(dv, var) \ |
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137 *((uint32_t *) &(dv[var - sizeof (uint32_t)])) = htobe32 (dv.size () - var); |
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138 |
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139 #define OCT_PQ_DECL_GET_INT32(retvar, pointer, type) \ |
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140 type retvar = be32toh (*((type *) pointer)); \ |
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141 pointer += 4; |
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142 |
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143 #define OCT_PQ_GET_INT32(retvar, pointer, type) \ |
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144 retvar = be32toh (*((type *) pointer)); \ |
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145 pointer += 4; |
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146 |
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147 #endif // __OCT_PQ_CONVERTERS__ |