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56
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_http.h>
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10
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11
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12 ngx_int_t
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13 ngx_http_script_compile_lite(ngx_conf_t *cf, ngx_array_t *sources,
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14 ngx_array_t **lengths, ngx_array_t **values,
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15 ngx_http_script_compile_lite_start_pt start,
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16 ngx_http_script_compile_lite_end_pt end)
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17 {
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18 uintptr_t *code;
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19 ngx_uint_t i;
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20 ngx_table_elt_t *src;
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21 ngx_http_variable_t *var;
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22 ngx_http_script_var_code_t *var_code;
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23
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24 if (sources->nelts == 0) {
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25 return NGX_OK;
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26 }
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27
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28 if (*lengths == NULL) {
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29 *lengths = ngx_array_create(cf->pool, 64, 1);
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30 if (*lengths == NULL) {
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31 return NGX_ERROR;
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32 }
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33 }
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34
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35 if (*values == NULL) {
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36 *values = ngx_array_create(cf->pool, 256, 1);
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37 if (*values == NULL) {
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38 return NGX_ERROR;
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39 }
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40 }
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41
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42 src = sources->elts;
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43 for (i = 0; i < sources->nelts; i++) {
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44
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45 if (src[i].value.data[0] == '$') {
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46 if (start(&src[i], *lengths, *values, 0) != NGX_OK) {
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47 return NGX_ERROR;
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48 }
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49
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50 src[i].value.len--;
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51 src[i].value.data++;
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52
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53 var = ngx_http_add_variable(cf, &src[i].value, 0);
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54
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55 if (var == NULL) {
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56 return NGX_ERROR;
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57 }
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58
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59 var_code = ngx_array_push_n(*lengths,
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60 sizeof(ngx_http_script_var_code_t));
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61 if (var_code == NULL) {
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62 return NGX_ERROR;
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63 }
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64
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65 var_code->code = (ngx_http_script_code_pt)
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66 ngx_http_script_copy_var_len;
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67 var_code->index = var->index;
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68
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69
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70 var_code = ngx_array_push_n(*values,
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71 sizeof(ngx_http_script_var_code_t));
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72 if (var_code == NULL) {
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73 return NGX_ERROR;
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74 }
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75
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76 var_code->code = ngx_http_script_copy_var;
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77 var_code->index = var->index;
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78
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79
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80 if (end(*lengths, *values) != NGX_OK) {
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81 return NGX_ERROR;
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82 }
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83
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84 continue;
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85 }
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86
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87 if (start(&src[i], *lengths, *values, 1) != NGX_OK) {
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88 return NGX_ERROR;
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89 }
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90 }
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91
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92 code = ngx_array_push_n(*lengths, sizeof(uintptr_t));
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93 if (code == NULL) {
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94 return NGX_ERROR;
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95 }
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96
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97 *code = (uintptr_t) NULL;
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98
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99 code = ngx_array_push_n(*values, sizeof(uintptr_t));
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100 if (code == NULL) {
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101 return NGX_ERROR;
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102 }
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103
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104 *code = (uintptr_t) NULL;
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105
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106 return NGX_OK;
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107 }
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108
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109
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110 #if 0
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111
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112 static void *
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113 ngx_http_script_start_code(ngx_pool_t *pool, ngx_array_t **codes, size_t size)
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114 {
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115 if (*codes == NULL) {
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116 *codes = ngx_array_create(pool, 256, 1);
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117 if (*codes == NULL) {
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118 return NULL;
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119 }
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120 }
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121
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122 return ngx_array_push_n(*codes, size);
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123 }
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124
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125 #endif
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126
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127
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128 size_t
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129 ngx_http_script_copy_len(ngx_http_script_engine_t *e)
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130 {
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131 ngx_http_script_copy_code_t *code;
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132
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133 code = (ngx_http_script_copy_code_t *) e->lite.ip;
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134
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135 e->lite.ip += sizeof(ngx_http_script_copy_code_t);
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136
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137 return code->len;
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138 }
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139
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140
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141 void
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142 ngx_http_script_copy(ngx_http_script_engine_t *e)
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143 {
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144 ngx_http_script_copy_code_t *code;
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145
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146 code = (ngx_http_script_copy_code_t *) e->lite.ip;
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147
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148 e->lite.pos = ngx_cpymem(e->lite.pos,
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149 e->lite.ip + sizeof(ngx_http_script_copy_code_t),
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150 code->len);
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151
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152 e->lite.ip += sizeof(ngx_http_script_copy_code_t)
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153 + ((code->len + sizeof(uintptr_t) - 1) & ~(sizeof(uintptr_t) - 1));
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154 }
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155
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156
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157 size_t
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158 ngx_http_script_copy_var_len(ngx_http_script_engine_t *e)
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159 {
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160 ngx_http_variable_value_t *value;
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161 ngx_http_script_var_code_t *code;
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162
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163 code = (ngx_http_script_var_code_t *) e->lite.ip;
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164
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165 e->lite.ip += sizeof(ngx_http_script_var_code_t);
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166
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167 value = ngx_http_get_indexed_variable(e->lite.request, code->index);
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168
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169 if (value == NULL || value == NGX_HTTP_VARIABLE_NOT_FOUND) {
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170 return 0;
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171 }
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172
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173 return value->text.len;
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174 }
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175
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176
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177 void
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178 ngx_http_script_copy_var(ngx_http_script_engine_t *e)
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179 {
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180 ngx_http_variable_value_t *value;
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181 ngx_http_script_var_code_t *code;
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182
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183 code = (ngx_http_script_var_code_t *) e->lite.ip;
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184
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185 e->lite.ip += sizeof(ngx_http_script_var_code_t);
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186
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187 value = ngx_http_get_indexed_variable(e->lite.request, code->index);
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188
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189 if (value == NULL || value == NGX_HTTP_VARIABLE_NOT_FOUND) {
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190 return;
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191 }
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192
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193 e->lite.pos = ngx_cpymem(e->lite.pos, value->text.data, value->text.len);
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194 }
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