Mercurial > forge
annotate main/database/src/converters.h @ 11712:f4c52c68f744 octave-forge
Added converters for types uuid and xml.
author | i7tiol |
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date | Sun, 19 May 2013 18:47:32 +0000 |
parents | 4f5471a9bce6 |
children | ee2b22964070 |
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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 |
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28 #include <vector> |
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29 #include <string> |
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30 |
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31 #include <libpq-fe.h> |
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32 |
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33 #include "wrap_endian.h" |
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34 |
11712 | 35 #define OCT_PQ_NUM_CONVERTERS 34 |
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36 |
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37 typedef std::vector<char> oct_pq_dynvec_t; |
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38 |
11657 | 39 class octave_pq_connection; |
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40 |
11657 | 41 typedef int (*oct_pq_to_octave_fp_t) (const octave_pq_connection &, |
42 const char *, octave_value &, int); | |
43 | |
44 typedef int (*oct_pq_from_octave_fp_t) (const octave_pq_connection &, | |
45 const octave_value &, | |
46 oct_pq_dynvec_t &); | |
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47 |
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48 typedef std::vector<Oid> oct_pq_el_oids_t; |
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49 |
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50 struct oct_pq_conv_t_; |
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51 |
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52 typedef std::vector<struct oct_pq_conv_t_ *> oct_pq_conv_cache_t; |
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53 |
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54 // some objects will be constants, some will be allocated |
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55 typedef struct oct_pq_conv_t_ |
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56 { |
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57 Oid oid; // read from server |
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58 Oid aoid; // array oid // read from server |
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59 oct_pq_el_oids_t el_oids; // element oids, empty for non-composite types |
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60 oct_pq_conv_cache_t conv_cache; // element converter structures for |
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61 //composite types |
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62 bool is_composite; // false for constant objects |
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63 bool is_enum; // false for constant objects |
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64 bool is_not_constant; // false for constant objects |
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65 // const char *name; not all constants, use std::string |
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66 std::string name; |
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67 oct_pq_to_octave_fp_t to_octave_str; |
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68 oct_pq_to_octave_fp_t to_octave_bin; |
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69 oct_pq_from_octave_fp_t from_octave_str; |
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70 oct_pq_from_octave_fp_t from_octave_bin; |
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71 } |
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72 oct_pq_conv_t; |
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73 |
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74 std::string &pq_basetype_prefix (void); |
11429 | 75 |
76 // a wrapper class for array of pointers to converters which qualifies | |
77 // base type names in initialization | |
78 class oct_pq_conv_ptrs_t | |
79 { | |
80 public: | |
81 | |
82 oct_pq_conv_ptrs_t (int n, oct_pq_conv_t **ptrs) : converters (ptrs) | |
83 { | |
84 for (int i = 0; i < n; i++) | |
85 { | |
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86 std::string prefix = pq_basetype_prefix (); |
11429 | 87 |
88 converters[i]->name = prefix.append (converters[i]->name); | |
89 } | |
90 } | |
91 | |
92 oct_pq_conv_t *operator[] (int i) { return converters[i]; } | |
93 | |
94 private: | |
95 | |
96 oct_pq_conv_t **converters; | |
97 }; | |
98 | |
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99 // a wrapper class around oct_pq_conv_t* to provide a default |
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100 // constructor which nullifies it, for efficient use of maps, where |
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101 // checking for the presence of a key while inserting it can rely on a |
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102 // newly generated key mapping to a value of NULL |
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103 class oct_pq_conv_wrapper_t |
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104 { |
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105 public: |
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106 |
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107 oct_pq_conv_wrapper_t (void) : conv (NULL) {} |
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108 |
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109 oct_pq_conv_wrapper_t (oct_pq_conv_t *c) : conv (c) {} |
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110 |
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111 operator oct_pq_conv_t *&(void) { return conv; } |
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112 |
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113 oct_pq_conv_t *&operator->(void) { return conv; } |
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114 |
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115 private: |
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116 |
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117 oct_pq_conv_t *conv; |
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118 }; |
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119 |
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120 // helper function for debugging |
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121 void print_conv (oct_pq_conv_t *); |
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122 |
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124 |
11410 | 125 // these prototypes are needed because pointers to these functions are |
126 // stored in the converter structures of each found enum type | |
11657 | 127 int to_octave_str_text (const octave_pq_connection &conn, |
128 const char *c, octave_value &ov, int nb); | |
129 int to_octave_bin_text (const octave_pq_connection &conn, | |
130 const char *c, octave_value &ov, int nb); | |
131 int from_octave_str_text (const octave_pq_connection &conn, | |
132 const octave_value &ov, oct_pq_dynvec_t &val); | |
133 int from_octave_bin_text (const octave_pq_connection &conn, | |
134 const octave_value &ov, oct_pq_dynvec_t &val); | |
11410 | 135 |
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136 // append bytes of value 'val' of type 'type' to dynamic char vector 'dv' |
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137 #define OCT_PQ_PUT(dv, type, val) \ |
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138 dv.resize (dv.size () + sizeof (type)); \ |
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139 *((type *) &(dv.end ()[-sizeof (type)])) = val; |
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140 |
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141 // increase size of dynamic char vector 'dv' by size of uint32 and |
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142 // store the new size in a variable named 'var' of octave_idx_type; |
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143 // after further increasing 'dv', OCT_PQ_FILL_UINT32_PLACEHOLDER |
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144 // should be used with equal arguments |
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145 #define OCT_PQ_SET_UINT32_PLACEHOLDER(dv, var) \ |
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146 octave_idx_type var = dv.size () + sizeof (uint32_t); \ |
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147 dv.resize (var); |
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148 // to be used after OCT_PQ_SET_UINT32_PLACEHOLDER with equal |
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149 // arguments; calculate difference between current size of dynamic |
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150 // char vector 'dv' and a previous size stored in a variable named |
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151 // 'var', and write this difference, converted to uint32_t in network |
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152 // byte order, to the placeholder within 'dv' just before the position |
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153 // stored in 'var' |
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154 #define OCT_PQ_FILL_UINT32_PLACEHOLDER(dv, var) \ |
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155 *((uint32_t *) &(dv[var - sizeof (uint32_t)])) = htobe32 (dv.size () - var); |
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156 |
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157 #define OCT_PQ_DECL_GET_INT32(retvar, pointer, type) \ |
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158 type retvar = be32toh (*((type *) pointer)); \ |
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159 pointer += 4; |
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160 |
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161 #define OCT_PQ_GET_INT32(retvar, pointer, type) \ |
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162 retvar = be32toh (*((type *) pointer)); \ |
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163 pointer += 4; |
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164 |
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165 #endif // __OCT_PQ_CONVERTERS__ |