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1 /** ===========================================================================
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2 ** R-Package: rdyncall
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3 ** File: src/rpack.c
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4 ** Description: (un-)packing of C structure data
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5 ** TODO
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6 ** - support for bitfields
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7 **/
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8
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9 // #define USE_RINTERNALS
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10 #include <Rinternals.h>
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11 #include <string.h>
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12 #include <stddef.h>
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13 #include "rdyncall_signature.h"
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14 /** ---------------------------------------------------------------------------
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15 ** C-Function: r_dataptr
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16 ** Description: retrieve the 'data' pointer on an R expression.
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17 ** R-Calling Convention: .Call
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18 **
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19 **/
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20
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21 static char* r_dataptr(SEXP x, SEXP off, size_t element_size)
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22 {
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23 if ( LENGTH(off) == 0 ) error("missing offset");
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24 char* p = NULL;
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25 ptrdiff_t o = INTEGER(off)[0], s = 0;
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26
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27 switch(TYPEOF(x))
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28 {
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29 case CHARSXP: p = (char*) CHAR(x); s = LENGTH(x)*sizeof(char); break;
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30 case LGLSXP: p = (char*) LOGICAL(x); s = LENGTH(x)*sizeof(Rboolean); break;
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31 case INTSXP: p = (char*) INTEGER(x); s = LENGTH(x)*sizeof(int); break;
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32 case REALSXP: p = (char*) REAL(x); s = LENGTH(x)*sizeof(double); break;
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33 case CPLXSXP: p = (char*) COMPLEX(x); s = LENGTH(x)*sizeof(Rcomplex); break;
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34 case STRSXP: p = (char*) CHAR( STRING_ELT(x,0) ); s = strlen(p)*sizeof(char); break;
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35 case RAWSXP: p = (char*) RAW(x); s = LENGTH(x)*sizeof(char); break;
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36 case EXTPTRSXP: return (char*) R_ExternalPtrAddr(x) + o; break;
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37 default: error("invalid object type"); break;
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38 }
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39 if (p == NULL) error("NULL address pointer");
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40 if (o < 0 || o+element_size > s) error("offset %d is out-of-bounds of the R object (max size %d)", o, s);
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41 return p + o;
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42 }
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43
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44
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45
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46 /** ---------------------------------------------------------------------------
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47 ** C-Function: r_pack
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48 ** Description: pack R data type into a C data type
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49 ** R-Calling Convention: .Call
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50 **
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51 **/
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52 SEXP r_pack(SEXP ptr_x, SEXP offset, SEXP sig_x, SEXP value_x)
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53 {
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54 int type_of = TYPEOF(value_x);
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55 const char* sig = CHAR(STRING_ELT(sig_x,0) );
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56 switch(sig[0])
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57 {
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58 case DC_SIGCHAR_BOOL:
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59 {
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60 int* Bp = (int*) r_dataptr(ptr_x, offset, sizeof(Rboolean));
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61 switch(type_of)
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62 {
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63 case LGLSXP: *Bp = (int) LOGICAL(value_x)[0]; break;
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64 case INTSXP: *Bp = (int) ( INTEGER(value_x)[0] == 0) ? 0 : 1; break;
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65 case REALSXP: *Bp = (int) ( REAL(value_x)[0] == 0.0) ? 0 : 1; break;
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66 case RAWSXP: *Bp = (int) ( RAW(value_x)[0] == 0) ? 0 : 1; break;
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67 default: error("value mismatch with 'B' pack type");
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68 }
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69 }
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70 break;
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71 case DC_SIGCHAR_CHAR:
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72 {
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73 char* cp = (char*) r_dataptr(ptr_x, offset, sizeof(char));
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74 switch(type_of)
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75 {
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76 case LGLSXP: *cp = (char) LOGICAL(value_x)[0]; break;
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77 case INTSXP: *cp = (char) INTEGER(value_x)[0]; break;
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78 case REALSXP: *cp = (char) REAL(value_x)[0]; break;
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79 case RAWSXP: *cp = (char) RAW(value_x)[0]; break;
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80 default: error("value mismatch with 'c' pack type");
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81 }
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82 }
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83 break;
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84 case DC_SIGCHAR_UCHAR:
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85 {
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86 unsigned char* cp = (unsigned char*) r_dataptr(ptr_x,offset,sizeof(unsigned char));
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87 switch(type_of)
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88 {
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89 case LGLSXP: *cp = (unsigned char) LOGICAL(value_x)[0]; break;
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90 case INTSXP: *cp = (unsigned char) INTEGER(value_x)[0]; break;
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91 case REALSXP: *cp = (unsigned char) REAL(value_x)[0]; break;
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92 case RAWSXP: *cp = (unsigned char) RAW(value_x)[0]; break;
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93 default: error("value mismatch with 'C' pack type");
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94 }
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95 }
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96 break;
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97 case DC_SIGCHAR_SHORT:
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98 {
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99 short* sp = (short*) r_dataptr(ptr_x,offset,sizeof(short));
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100 switch(type_of)
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101 {
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102 case LGLSXP: *sp = (short) LOGICAL(value_x)[0]; break;
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103 case INTSXP: *sp = (short) INTEGER(value_x)[0]; break;
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104 case REALSXP: *sp = (short) REAL(value_x)[0]; break;
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105 case RAWSXP: *sp = (short) RAW(value_x)[0]; break;
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106 default: error("value mismatch with 's' pack type");
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107 }
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108 }
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109 break;
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110 case DC_SIGCHAR_USHORT:
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111 {
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112 unsigned short* sp = (unsigned short*) r_dataptr(ptr_x,offset,sizeof(unsigned short));
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113 switch(type_of)
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114 {
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115 case LGLSXP: *sp = (unsigned short) LOGICAL(value_x)[0]; break;
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116 case INTSXP: *sp = (unsigned short) INTEGER(value_x)[0]; break;
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117 case REALSXP: *sp = (unsigned short) REAL(value_x)[0]; break;
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118 case RAWSXP: *sp = (unsigned short) RAW(value_x)[0]; break;
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119 default: error("value mismatch with 'S' pack type");
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120 }
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121 }
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122 break;
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123 case DC_SIGCHAR_INT:
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124 {
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125 int* ip = (int*) r_dataptr(ptr_x,offset,sizeof(int));
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126 switch(type_of)
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127 {
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128 case LGLSXP: *ip = (int) LOGICAL(value_x)[0]; break;
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129 case INTSXP: *ip = (int) INTEGER(value_x)[0]; break;
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130 case REALSXP: *ip = (int) REAL(value_x)[0]; break;
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131 case RAWSXP: *ip = (int) RAW(value_x)[0]; break;
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132 default: error("value mismatch with 'i' pack type");
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133 }
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134 }
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135 break;
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136 case DC_SIGCHAR_UINT:
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137 {
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138 unsigned int* ip = (unsigned int*) r_dataptr(ptr_x,offset,sizeof(unsigned int));
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139 switch(type_of)
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140 {
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141 case LGLSXP: *ip = (unsigned int) LOGICAL(value_x)[0]; break;
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142 case INTSXP: *ip = (unsigned int) INTEGER(value_x)[0]; break;
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143 case REALSXP: *ip = (unsigned int) REAL(value_x)[0]; break;
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144 case RAWSXP: *ip = (unsigned int) RAW(value_x)[0]; break;
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145 default: error("value mismatch with 'I' pack type");
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146 }
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147 }
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148 break;
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149 case DC_SIGCHAR_LONG:
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150 {
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151 long* ip = (long*) r_dataptr(ptr_x,offset,sizeof(long));
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152 switch(type_of)
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153 {
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154 case LGLSXP: *ip = (long) LOGICAL(value_x)[0]; break;
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155 case INTSXP: *ip = (long) INTEGER(value_x)[0]; break;
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156 case REALSXP: *ip = (long) REAL(value_x)[0]; break;
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157 case RAWSXP: *ip = (long) RAW(value_x)[0]; break;
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158 default: error("value mismatch with 'j' pack type");
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159 }
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160 }
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161 break;
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162 case DC_SIGCHAR_ULONG:
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163 {
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164 unsigned long* ip = (unsigned long*) r_dataptr(ptr_x,offset,sizeof(unsigned long));
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165 switch(type_of)
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166 {
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167 case LGLSXP: *ip = (unsigned long) LOGICAL(value_x)[0]; break;
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168 case INTSXP: *ip = (unsigned long) INTEGER(value_x)[0]; break;
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169 case REALSXP: *ip = (unsigned long) REAL(value_x)[0]; break;
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170 case RAWSXP: *ip = (unsigned long) RAW(value_x)[0]; break;
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171 default: error("value mismatch with 'J' pack type");
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172 }
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173 }
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174 break;
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175 case DC_SIGCHAR_LONGLONG:
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176 {
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177 long long* Lp = (long long*) r_dataptr(ptr_x,offset,sizeof(long long));
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178 switch(type_of)
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179 {
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180 case LGLSXP: *Lp = (long long) LOGICAL(value_x)[0]; break;
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181 case INTSXP: *Lp = (long long) INTEGER(value_x)[0]; break;
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182 case REALSXP: *Lp = (long long) REAL(value_x)[0]; break;
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183 case RAWSXP: *Lp = (long long) RAW(value_x)[0]; break;
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184 default: error("value mismatch with 'l' pack type");
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185 }
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186 }
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187 break;
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188 case DC_SIGCHAR_ULONGLONG:
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189 {
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190 unsigned long long* Lp = (unsigned long long*) r_dataptr(ptr_x,offset,sizeof(unsigned long long));
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191 switch(type_of)
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192 {
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193 case LGLSXP: *Lp = (unsigned long long) LOGICAL(value_x)[0]; break;
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194 case INTSXP: *Lp = (unsigned long long) INTEGER(value_x)[0]; break;
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195 case REALSXP: *Lp = (unsigned long long) REAL(value_x)[0]; break;
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196 case RAWSXP: *Lp = (unsigned long long) RAW(value_x)[0]; break;
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197 default: error("value mismatch with 'L' pack type");
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198 }
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199 }
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200 break;
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201 case DC_SIGCHAR_FLOAT:
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202 {
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203 float* fp = (float*) r_dataptr(ptr_x,offset,sizeof(float));
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204 switch(type_of)
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205 {
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206 case LGLSXP: *fp = (float) LOGICAL(value_x)[0]; break;
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207 case INTSXP: *fp = (float) INTEGER(value_x)[0]; break;
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208 case REALSXP: *fp = (float) REAL(value_x)[0]; break;
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209 case RAWSXP: *fp = (float) RAW(value_x)[0]; break;
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210 default: error("value mismatch with 'f' pack type");
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211 }
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212 }
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213 break;
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214 case DC_SIGCHAR_DOUBLE:
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215 {
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216 double* dp = (double*) r_dataptr(ptr_x,offset,sizeof(double));
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217 switch(type_of)
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218 {
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219 case LGLSXP: *dp = (double) LOGICAL(value_x)[0]; break;
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220 case INTSXP: *dp = (double) INTEGER(value_x)[0]; break;
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221 case REALSXP: *dp = (double) REAL(value_x)[0]; break;
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222 case RAWSXP: *dp = (double) RAW(value_x)[0]; break;
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223 default: error("value mismatch with 'd' pack type");
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224 }
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225 }
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226 break;
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227 case DC_SIGCHAR_POINTER:
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228 case '*':
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229 {
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230 void** pp = (void**) r_dataptr(ptr_x,offset,sizeof(void*));
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231 switch(type_of)
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232 {
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233 case NILSXP: *pp = (void*) 0; break;
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234 case CHARSXP: *pp = (void*) CHAR(value_x); break;
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235 case LGLSXP: *pp = (void*) LOGICAL(value_x); break;
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236 case INTSXP: *pp = (void*) INTEGER(value_x); break;
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237 case REALSXP: *pp = (void*) REAL(value_x); break;
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238 case CPLXSXP: *pp = (void*) COMPLEX(value_x); break;
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239 case STRSXP: *pp = (void*) CHAR( STRING_ELT(value_x,0) ); break;
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240 case EXTPTRSXP:*pp = (void*) R_ExternalPtrAddr(value_x); break;
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241 case RAWSXP: *pp = (void*) RAW(value_x); break;
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242 default: error("value type mismatch with 'p' pack type");
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243 }
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244 }
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245 break;
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246 case DC_SIGCHAR_STRING:
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247 {
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248 char** Sp = (char**) r_dataptr(ptr_x,offset,sizeof(char*));
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249 switch(type_of)
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250 {
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251 case NILSXP: *Sp = (char*) NULL; break;
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252 case CHARSXP: *Sp = (char*) CHAR(value_x); break;
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253 case STRSXP: *Sp = (char*) CHAR( STRING_ELT(value_x,0) ); break;
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254 case EXTPTRSXP:*Sp = (char*) R_ExternalPtrAddr(value_x); break;
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255 default: error("value type mismatch with 'Z' pack type");
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256 }
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257 }
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258 break;
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259 case DC_SIGCHAR_SEXP:
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260 {
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261 SEXP* px = (SEXP*) r_dataptr(ptr_x,offset,sizeof(SEXP*));
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262 *px = value_x;
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263 }
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264 break;
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265 default: error("invalid signature");
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266 }
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267 return R_NilValue;
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268 }
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269
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270 /** ---------------------------------------------------------------------------
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271 ** C-Function: r_unpack
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272 ** Description: unpack elements from C-like structures to R values.
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273 ** R-Calling Convention: .Call
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274 **
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275 **/
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276 SEXP r_unpack(SEXP ptr_x, SEXP offset, SEXP sig_x)
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277 {
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278 char* ptr = NULL;
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279 const char* sig = CHAR(STRING_ELT(sig_x,0) );
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280 switch(sig[0])
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281 {
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282 case DC_SIGCHAR_BOOL:
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283 ptr = r_dataptr(ptr_x,offset,sizeof(Rboolean));
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284 return ScalarLogical( ((int*)ptr)[0] );
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285 case DC_SIGCHAR_CHAR:
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286 ptr = r_dataptr(ptr_x,offset,sizeof(char));
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287 return ScalarInteger( ( (char*)ptr)[0] );
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288 case DC_SIGCHAR_UCHAR:
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289 ptr = r_dataptr(ptr_x,offset,sizeof(unsigned char));
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290 return ScalarInteger( ( (unsigned char*)ptr)[0] );
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291 case DC_SIGCHAR_SHORT:
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292 ptr = r_dataptr(ptr_x,offset,sizeof(short));
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293 return ScalarInteger( ( (short*)ptr)[0] );
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294 case DC_SIGCHAR_USHORT:
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295 ptr = r_dataptr(ptr_x,offset,sizeof(unsigned short));
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296 return ScalarInteger( ( (unsigned short*)ptr)[0] );
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297 case DC_SIGCHAR_INT:
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298 ptr = r_dataptr(ptr_x,offset,sizeof(int));
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299 return ScalarInteger( ( (int*)ptr )[0] );
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300 case DC_SIGCHAR_UINT:
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301 ptr = r_dataptr(ptr_x,offset,sizeof(unsigned int));
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302 return ScalarReal( (double) ( (unsigned int*)ptr )[0] );
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303 case DC_SIGCHAR_LONG:
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304 ptr = r_dataptr(ptr_x,offset,sizeof(long));
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305 return ScalarReal( (double) ( (long*)ptr )[0] );
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306 case DC_SIGCHAR_ULONG:
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307 ptr = r_dataptr(ptr_x,offset,sizeof(unsigned long));
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308 return ScalarReal( (double) ( (unsigned long*) ptr )[0] );
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309 case DC_SIGCHAR_FLOAT:
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310 ptr = r_dataptr(ptr_x,offset,sizeof(float));
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311 return ScalarReal( (double) ( (float*) ptr )[0] );
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312 case DC_SIGCHAR_DOUBLE:
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313 ptr = r_dataptr(ptr_x,offset,sizeof(double));
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314 return ScalarReal( ((double*)ptr)[0] );
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315 case DC_SIGCHAR_LONGLONG:
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316 ptr = r_dataptr(ptr_x,offset,sizeof(long long));
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317 return ScalarReal( (double) ( ((long long*)ptr)[0] ) );
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318 case DC_SIGCHAR_ULONGLONG:
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319 ptr = r_dataptr(ptr_x,offset,sizeof(unsigned long long));
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320 return ScalarReal( (double) ( ((unsigned long long*)ptr)[0] ) );
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321 case '*':
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322 case DC_SIGCHAR_POINTER:
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323 ptr = r_dataptr(ptr_x,offset,sizeof(void*));
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324 return R_MakeExternalPtr( ((void**)ptr)[0] , R_NilValue, R_NilValue );
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325 case DC_SIGCHAR_STRING: {
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326 ptr = r_dataptr(ptr_x,offset,sizeof(char*));
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327 char* s = ( (char**) ptr )[0];
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328 if (s == NULL) return R_MakeExternalPtr( 0, R_NilValue, R_NilValue );
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329 return mkString(s);
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330 }
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331 case DC_SIGCHAR_SEXP:
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332 return (SEXP) ptr;
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333 default: error("invalid signature");
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334 }
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335 return R_NilValue;
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336 }
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