prosody
e282c92ded0e
util-src/struct.c

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util-src/struct.c @ 12906:e282c92ded0e

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author Kim Alvefur <zash@zash.se>
date Thu, 23 Feb 2023 16:25:31 +0100
parent 12853:e1a71e83d430
child 12976:a187600ec7d6
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rev   line source
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1 /*
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2 ** {======================================================
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3 ** Library for packing/unpacking structures.
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4 ** $Id: struct.c,v 1.8 2018/05/16 11:00:23 roberto Exp $
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5 ** See Copyright Notice at the end of this file
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6 ** =======================================================
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7 */
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8 /*
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9 ** Valid formats:
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10 ** > - big endian
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11 ** < - little endian
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12 ** ![num] - alignment
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13 ** x - padding
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14 ** b/B - signed/unsigned byte
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15 ** h/H - signed/unsigned short
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16 ** l/L - signed/unsigned long
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17 ** T - size_t
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18 ** i/In - signed/unsigned integer with size 'n' (default is size of int)
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19 ** cn - sequence of 'n' chars (from/to a string); when packing, n==0 means
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20 the whole string; when unpacking, n==0 means use the previous
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21 read number as the string length
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22 ** s - zero-terminated string
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23 ** f - float
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24 ** d - double
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25 ** ' ' - ignored
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26 */
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27
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28
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29 #include <ctype.h>
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30 #include <limits.h>
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31 #include <stddef.h>
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32 #include <string.h>
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33
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34
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35 #include "lua.h"
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36 #include "lauxlib.h"
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37
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39
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40 /* basic integer type */
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41 #if !defined(STRUCT_INT)
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42 #define STRUCT_INT long
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43 #endif
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44
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45 typedef STRUCT_INT Inttype;
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46
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47 /* corresponding unsigned version */
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48 typedef unsigned STRUCT_INT Uinttype;
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49
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50
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51 /* maximum size (in bytes) for integral types */
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52 #define MAXINTSIZE 32
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53
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54 /* is 'x' a power of 2? */
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55 #define isp2(x) ((x) > 0 && ((x) & ((x) - 1)) == 0)
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56
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57 /* dummy structure to get alignment requirements */
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58 struct cD {
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59 char c;
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60 double d;
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61 };
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62
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63
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64 #define PADDING (sizeof(struct cD) - sizeof(double))
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65 #define MAXALIGN (PADDING > sizeof(int) ? PADDING : sizeof(int))
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66
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67
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68 /* endian options */
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69 #define BIG 0
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70 #define LITTLE 1
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71
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72
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73 static union {
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74 int dummy;
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75 char endian;
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76 } const native = {1};
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77
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78
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79 typedef struct Header {
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80 int endian;
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81 int align;
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82 } Header;
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83
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84
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85 static int getnum (const char **fmt, int df) {
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86 if (!isdigit(**fmt)) /* no number? */
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87 return df; /* return default value */
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88 else {
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89 int a = 0;
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90 do {
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91 a = a*10 + *((*fmt)++) - '0';
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92 } while (isdigit(**fmt));
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93 return a;
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94 }
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95 }
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96
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97
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98 #define defaultoptions(h) ((h)->endian = native.endian, (h)->align = 1)
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99
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100
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101
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102 static size_t optsize (lua_State *L, char opt, const char **fmt) {
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103 switch (opt) {
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104 case 'B': case 'b': return sizeof(char);
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105 case 'H': case 'h': return sizeof(short);
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106 case 'L': case 'l': return sizeof(long);
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107 case 'T': return sizeof(size_t);
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108 case 'f': return sizeof(float);
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109 case 'd': return sizeof(double);
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110 case 'x': return 1;
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111 case 'c': return getnum(fmt, 1);
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112 case 'i': case 'I': {
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113 int sz = getnum(fmt, sizeof(int));
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114 if (sz > MAXINTSIZE)
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115 luaL_error(L, "integral size %d is larger than limit of %d",
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116 sz, MAXINTSIZE);
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117 return sz;
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118 }
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119 default: return 0; /* other cases do not need alignment */
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120 }
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121 }
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122
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123
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124 /*
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125 ** return number of bytes needed to align an element of size 'size'
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126 ** at current position 'len'
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127 */
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128 static int gettoalign (size_t len, Header *h, int opt, size_t size) {
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129 if (size == 0 || opt == 'c') return 0;
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130 if (size > (size_t)h->align)
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131 size = h->align; /* respect max. alignment */
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132 return (size - (len & (size - 1))) & (size - 1);
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133 }
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134
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135
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136 /*
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137 ** options to control endianness and alignment
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138 */
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139 static void controloptions (lua_State *L, int opt, const char **fmt,
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140 Header *h) {
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141 switch (opt) {
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142 case ' ': return; /* ignore white spaces */
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143 case '>': h->endian = BIG; return;
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144 case '<': h->endian = LITTLE; return;
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145 case '!': {
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146 int a = getnum(fmt, MAXALIGN);
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147 if (!isp2(a))
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148 luaL_error(L, "alignment %d is not a power of 2", a);
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parents:
diff changeset
149 h->align = a;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
150 return;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
151 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
152 default: {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
153 const char *msg = lua_pushfstring(L, "invalid format option '%c'", opt);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
154 luaL_argerror(L, 1, msg);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
155 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
156 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
157 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
158
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
159
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
160 static void putinteger (lua_State *L, luaL_Buffer *b, int arg, int endian,
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
161 int size) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
162 lua_Number n = luaL_checknumber(L, arg);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
163 Uinttype value;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
164 char buff[MAXINTSIZE];
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
165 if (n < 0)
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
166 value = (Uinttype)(Inttype)n;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
167 else
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
168 value = (Uinttype)n;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
169 if (endian == LITTLE) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
170 int i;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
171 for (i = 0; i < size; i++) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
172 buff[i] = (value & 0xff);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
173 value >>= 8;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
174 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
175 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
176 else {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
177 int i;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
178 for (i = size - 1; i >= 0; i--) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
179 buff[i] = (value & 0xff);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
180 value >>= 8;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
181 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
182 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
183 luaL_addlstring(b, buff, size);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
184 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
185
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
186
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
187 static void correctbytes (char *b, int size, int endian) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
188 if (endian != native.endian) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
189 int i = 0;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
190 while (i < --size) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
191 char temp = b[i];
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
192 b[i++] = b[size];
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
193 b[size] = temp;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
194 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
195 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
196 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
197
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
198
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
199 static int b_pack (lua_State *L) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
200 luaL_Buffer b;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
201 const char *fmt = luaL_checkstring(L, 1);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
202 Header h;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
203 int arg = 2;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
204 size_t totalsize = 0;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
205 defaultoptions(&h);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
206 lua_pushnil(L); /* mark to separate arguments from string buffer */
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
207 luaL_buffinit(L, &b);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
208 while (*fmt != '\0') {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
209 int opt = *fmt++;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
210 size_t size = optsize(L, opt, &fmt);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
211 int toalign = gettoalign(totalsize, &h, opt, size);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
212 totalsize += toalign;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
213 while (toalign-- > 0) luaL_addchar(&b, '\0');
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
214 switch (opt) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
215 case 'b': case 'B': case 'h': case 'H':
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
216 case 'l': case 'L': case 'T': case 'i': case 'I': { /* integer types */
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
217 putinteger(L, &b, arg++, h.endian, size);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
218 break;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
219 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
220 case 'x': {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
221 luaL_addchar(&b, '\0');
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
222 break;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
223 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
224 case 'f': {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
225 float f = (float)luaL_checknumber(L, arg++);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
226 correctbytes((char *)&f, size, h.endian);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
227 luaL_addlstring(&b, (char *)&f, size);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
228 break;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
229 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
230 case 'd': {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
231 double d = luaL_checknumber(L, arg++);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
232 correctbytes((char *)&d, size, h.endian);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
233 luaL_addlstring(&b, (char *)&d, size);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
234 break;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
235 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
236 case 'c': case 's': {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
237 size_t l;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
238 const char *s = luaL_checklstring(L, arg++, &l);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
239 if (size == 0) size = l;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
240 luaL_argcheck(L, l >= (size_t)size, arg, "string too short");
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
241 luaL_addlstring(&b, s, size);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
242 if (opt == 's') {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
243 luaL_addchar(&b, '\0'); /* add zero at the end */
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
244 size++;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
245 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
246 break;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
247 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
248 default: controloptions(L, opt, &fmt, &h);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
249 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
250 totalsize += size;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
251 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
252 luaL_pushresult(&b);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
253 return 1;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
254 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
255
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
256
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
257 static lua_Number getinteger (const char *buff, int endian,
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
258 int issigned, int size) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
259 Uinttype l = 0;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
260 int i;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
261 if (endian == BIG) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
262 for (i = 0; i < size; i++) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
263 l <<= 8;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
264 l |= (Uinttype)(unsigned char)buff[i];
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
265 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
266 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
267 else {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
268 for (i = size - 1; i >= 0; i--) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
269 l <<= 8;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
270 l |= (Uinttype)(unsigned char)buff[i];
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
271 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
272 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
273 if (!issigned)
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
274 return (lua_Number)l;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
275 else { /* signed format */
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
276 Uinttype mask = (Uinttype)(~((Uinttype)0)) << (size*8 - 1);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
277 if (l & mask) /* negative value? */
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
278 l |= mask; /* signal extension */
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
279 return (lua_Number)(Inttype)l;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
280 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
281 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
282
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
283
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
284 static int b_unpack (lua_State *L) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
285 Header h;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
286 const char *fmt = luaL_checkstring(L, 1);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
287 size_t ld;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
288 const char *data = luaL_checklstring(L, 2, &ld);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
289 size_t pos = (size_t)luaL_optinteger(L, 3, 1) - 1;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
290 int n = 0; /* number of results */
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
291 luaL_argcheck(L, pos <= ld, 3, "initial position out of string");
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
292 defaultoptions(&h);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
293 while (*fmt) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
294 int opt = *fmt++;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
295 size_t size = optsize(L, opt, &fmt);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
296 pos += gettoalign(pos, &h, opt, size);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
297 luaL_argcheck(L, size <= ld - pos, 2, "data string too short");
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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298 /* stack space for item + next position */
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diff changeset
299 luaL_checkstack(L, 2, "too many results");
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diff changeset
300 switch (opt) {
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301 case 'b': case 'B': case 'h': case 'H':
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302 case 'l': case 'L': case 'T': case 'i': case 'I': { /* integer types */
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303 int issigned = islower(opt);
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304 lua_Number res = getinteger(data+pos, h.endian, issigned, size);
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305 lua_pushnumber(L, res); n++;
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306 break;
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307 }
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308 case 'x': {
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309 break;
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310 }
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311 case 'f': {
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312 float f;
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313 memcpy(&f, data+pos, size);
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314 correctbytes((char *)&f, sizeof(f), h.endian);
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315 lua_pushnumber(L, f); n++;
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316 break;
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317 }
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318 case 'd': {
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319 double d;
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320 memcpy(&d, data+pos, size);
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321 correctbytes((char *)&d, sizeof(d), h.endian);
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322 lua_pushnumber(L, d); n++;
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323 break;
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324 }
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325 case 'c': {
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326 if (size == 0) {
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327 if (n == 0 || !lua_isnumber(L, -1))
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328 luaL_error(L, "format 'c0' needs a previous size");
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329 size = lua_tonumber(L, -1);
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330 lua_pop(L, 1); n--;
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331 luaL_argcheck(L, size <= ld - pos, 2, "data string too short");
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332 }
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333 lua_pushlstring(L, data+pos, size); n++;
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334 break;
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335 }
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336 case 's': {
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337 const char *e = (const char *)memchr(data+pos, '\0', ld - pos);
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338 if (e == NULL)
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339 luaL_error(L, "unfinished string in data");
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340 size = (e - (data+pos)) + 1;
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341 lua_pushlstring(L, data+pos, size - 1); n++;
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342 break;
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343 }
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344 default: controloptions(L, opt, &fmt, &h);
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345 }
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346 pos += size;
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347 }
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348 lua_pushinteger(L, pos + 1); /* next position */
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349 return n + 1;
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350 }
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351
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352
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353 static int b_size (lua_State *L) {
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diff changeset
354 Header h;
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355 const char *fmt = luaL_checkstring(L, 1);
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356 size_t pos = 0;
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diff changeset
357 defaultoptions(&h);
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diff changeset
358 while (*fmt) {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
359 int opt = *fmt++;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
360 size_t size = optsize(L, opt, &fmt);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
361 pos += gettoalign(pos, &h, opt, size);
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diff changeset
362 if (opt == 's')
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
363 luaL_argerror(L, 1, "option 's' has no fixed size");
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parents:
diff changeset
364 else if (opt == 'c' && size == 0)
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
365 luaL_argerror(L, 1, "option 'c0' has no fixed size");
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parents:
diff changeset
366 if (!isalnum(opt))
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
367 controloptions(L, opt, &fmt, &h);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
368 pos += size;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
369 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
370 lua_pushinteger(L, pos);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
371 return 1;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
372 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
373
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
374 /* }====================================================== */
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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diff changeset
375
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
376
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
377
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
378 static const struct luaL_Reg thislib[] = {
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
379 {"pack", b_pack},
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
380 {"unpack", b_unpack},
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
381 {"size", b_size},
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
382 {NULL, NULL}
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
383 };
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
384
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
385
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
386 LUALIB_API int luaopen_util_struct (lua_State *L);
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
387
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
388 LUALIB_API int luaopen_util_struct (lua_State *L) {
12575
1f6f05a98fcd util-src: Remove Lua 5.1 compat macros
Kim Alvefur <zash@zash.se>
parents: 12387
diff changeset
389 luaL_newlib(L, thislib);
12354
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
390 return 1;
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
391 }
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
392
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
393
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
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parents:
diff changeset
394 /******************************************************************************
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
395 * Copyright (C) 2010-2018 Lua.org, PUC-Rio. All rights reserved.
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
396 *
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
397 * Permission is hereby granted, free of charge, to any person obtaining
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
398 * a copy of this software and associated documentation files (the
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
399 * "Software"), to deal in the Software without restriction, including
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
400 * without limitation the rights to use, copy, modify, merge, publish,
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
401 * distribute, sublicense, and/or sell copies of the Software, and to
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
402 * permit persons to whom the Software is furnished to do so, subject to
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
403 * the following conditions:
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
404 *
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
405 * The above copyright notice and this permission notice shall be
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
406 * included in all copies or substantial portions of the Software.
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
407 *
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
408 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
409 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
410 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
411 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
412 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
413 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
414 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
415 ******************************************************************************/
3ce3633527af util.struct: Import Roberto 'struct' library v0.3
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
416