]> cvs.zerfleddert.de Git - proxmark3-svn/blob - client/pm3_binlib.c
implementation of command library in lua
[proxmark3-svn] / client / pm3_binlib.c
1 /*
2 * lpack.c
3 * a Lua library for packing and unpacking binary data
4 * Luiz Henrique de Figueiredo <lhf@tecgraf.puc-rio.br>
5 * 29 Jun 2007 19:27:20
6 * This code is hereby placed in the public domain.
7 * with contributions from Ignacio Castao <castanyo@yahoo.es> and
8 * Roberto Ierusalimschy <roberto@inf.puc-rio.br>.
9 */
10
11 #define OP_ZSTRING 'z' /* zero-terminated string */
12 #define OP_BSTRING 'p' /* string preceded by length byte */
13 #define OP_WSTRING 'P' /* string preceded by length word */
14 #define OP_SSTRING 'a' /* string preceded by length size_t */
15 #define OP_STRING 'A' /* string */
16 #define OP_FLOAT 'f' /* float */
17 #define OP_DOUBLE 'd' /* double */
18 #define OP_NUMBER 'n' /* Lua number */
19 #define OP_CHAR 'c' /* char (1-byte int) */
20 #define OP_BYTE 'C' /* byte = unsigned char (1-byte unsigned int) */
21 #define OP_SHORT 's' /* short (2-byte int) */
22 #define OP_USHORT 'S' /* unsigned short (2-byte unsigned int) */
23 #define OP_INT 'i' /* int (4-byte int) */
24 #define OP_UINT 'I' /* unsigned int (4-byte unsigned int) */
25 #define OP_LONG 'l' /* long (8-byte int) */
26 #define OP_ULONG 'L' /* unsigned long (8-byte unsigned int) */
27 #define OP_LITTLEENDIAN '<' /* little endian */
28 #define OP_BIGENDIAN '>' /* big endian */
29 #define OP_NATIVE '=' /* native endian */
30
31 #define OP_HEX 'H'
32
33 #include <ctype.h>
34 #include <string.h>
35 #include <lua.h>
36 #include <lualib.h>
37 #include <lauxlib.h>
38
39 #include "pm3_binlib.h"
40
41
42 static void badcode(lua_State *L, int c)
43 {
44 char s[]="bad code `?'";
45 s[sizeof(s)-3]=c;
46 luaL_argerror(L,1,s);
47 }
48
49 static int doendian(int c)
50 {
51 int x=1;
52 int e=*(char*)&x;
53 if (c==OP_LITTLEENDIAN) return !e;
54 if (c==OP_BIGENDIAN) return e;
55 if (c==OP_NATIVE) return 0;
56 return 0;
57 }
58
59 static void doswap(int swap, void *p, size_t n)
60 {
61 if (swap)
62 {
63 char *a=(char*)p;
64 int i,j;
65 for (i=0, j=n-1, n=n/2; n--; i++, j--)
66 {
67 char t=a[i]; a[i]=a[j]; a[j]=t;
68 }
69 }
70 }
71
72 #define UNPACKNUMBER(OP,T) \
73 case OP: \
74 { \
75 T a; \
76 int m=sizeof(a); \
77 if (i+m>len) { done = 1; break;} \
78 memcpy(&a,s+i,m); \
79 i+=m; \
80 doswap(swap,&a,m); \
81 lua_pushnumber(L,(lua_Number)a); \
82 ++n; \
83 break; \
84 }
85
86 #define UNPACKSTRING(OP,T) \
87 case OP: \
88 { \
89 T l; \
90 int m=sizeof(l); \
91 if (i+m>len) { done = 1; break; } \
92 memcpy(&l,s+i,m); \
93 doswap(swap,&l,m); \
94 if (i+m+l>len) { done = 1; break;} \
95 i+=m; \
96 lua_pushlstring(L,s+i,l); \
97 i+=l; \
98 ++n; \
99 break; \
100 }
101
102 #define HEXDIGITS(DIG) \
103 "0123456789ABCDEF"[DIG]
104
105 static int l_unpack(lua_State *L) /** unpack(f,s, [init]) */
106 {
107 size_t len;
108 const char *s=luaL_checklstring(L,2,&len); /* switched s and f */
109 const char *f=luaL_checkstring(L,1);
110 int i_read = luaL_optint(L,3,1)-1;
111 unsigned int i;
112 if (i_read >= 0) {
113 i = i_read;
114 } else {
115 i = 0;
116 }
117 int n=0;
118 int swap=0;
119 int done=0;
120 lua_pushnil(L);
121 while (*f && done == 0)
122 {
123 int c=*f++;
124 int N=1;
125 if (isdigit((int) (unsigned char) *f))
126 {
127 N=0;
128 while (isdigit((int) (unsigned char) *f)) N=10*N+(*f++)-'0';
129 if (N==0 && c==OP_STRING) { lua_pushliteral(L,""); ++n; }
130 }
131 while (N-- && done == 0) switch (c)
132 {
133 case OP_LITTLEENDIAN:
134 case OP_BIGENDIAN:
135 case OP_NATIVE:
136 {
137 swap=doendian(c);
138 N=0;
139 break;
140 }
141 case OP_STRING:
142 {
143 ++N;
144 if (i+N>len) {done = 1; break; }
145 lua_pushlstring(L,s+i,N);
146 i+=N;
147 ++n;
148 N=0;
149 break;
150 }
151 case OP_ZSTRING:
152 {
153 size_t l;
154 if (i>=len) {done = 1; break; }
155 l=strlen(s+i);
156 lua_pushlstring(L,s+i,l);
157 i+=l+1;
158 ++n;
159 break;
160 }
161 UNPACKSTRING(OP_BSTRING, unsigned char)
162 UNPACKSTRING(OP_WSTRING, unsigned short)
163 UNPACKSTRING(OP_SSTRING, size_t)
164 UNPACKNUMBER(OP_NUMBER, lua_Number)
165 UNPACKNUMBER(OP_DOUBLE, double)
166 UNPACKNUMBER(OP_FLOAT, float)
167 UNPACKNUMBER(OP_CHAR, char)
168 UNPACKNUMBER(OP_BYTE, unsigned char)
169 UNPACKNUMBER(OP_SHORT, short)
170 UNPACKNUMBER(OP_USHORT, unsigned short)
171 UNPACKNUMBER(OP_INT, int)
172 UNPACKNUMBER(OP_UINT, unsigned int)
173 UNPACKNUMBER(OP_LONG, long)
174 UNPACKNUMBER(OP_ULONG, unsigned long)
175 case OP_HEX:
176 {
177 luaL_Buffer buf;
178 char hdigit = '0';
179 int val = 0;
180 luaL_buffinit(L,&buf);
181 N++;
182 if (i+N > len) {done = 1; break;}
183 for (unsigned int ii = i; ii < i+N; ii++) {
184 val = s[ii] & 0xF0;
185 val = val >> 4;
186 hdigit = HEXDIGITS(val);
187 luaL_addlstring(&buf, &hdigit, 1);
188
189 val = s[ii] & 0x0F;
190 hdigit = HEXDIGITS(val);
191 luaL_addlstring(&buf, &hdigit, 1);
192 }
193 luaL_pushresult(&buf);
194 n++;
195 i += N;
196 N = 0;
197 break;
198 }
199
200 case ' ': case ',':
201 break;
202 default:
203 badcode(L,c);
204 break;
205 }
206 }
207 lua_pushnumber(L,i+1);
208 lua_replace(L,-n-2);
209 return n+1;
210 }
211
212 #define PACKNUMBER(OP,T) \
213 case OP: \
214 { \
215 T a=(T)luaL_checknumber(L,i++); \
216 doswap(swap,&a,sizeof(a)); \
217 luaL_addlstring(&b,(char*)&a,sizeof(a)); \
218 break; \
219 }
220
221 #define PACKSTRING(OP,T) \
222 case OP: \
223 { \
224 size_t l; \
225 const char *a=luaL_checklstring(L,i++,&l); \
226 T ll=(T)l; \
227 doswap(swap,&ll,sizeof(ll)); \
228 luaL_addlstring(&b,(char*)&ll,sizeof(ll)); \
229 luaL_addlstring(&b,a,l); \
230 break; \
231 }
232
233 static int l_pack(lua_State *L) /** pack(f,...) */
234 {
235 int i=2;
236 const char *f=luaL_checkstring(L,1);
237 int swap=0;
238 luaL_Buffer b;
239 luaL_buffinit(L,&b);
240 while (*f)
241 {
242 int c=*f++;
243 int N=1;
244 if (isdigit((int) (unsigned char) *f))
245 {
246 N=0;
247 while (isdigit((int) (unsigned char) *f)) N=10*N+(*f++)-'0';
248 }
249 while (N--) switch (c)
250 {
251 case OP_LITTLEENDIAN:
252 case OP_BIGENDIAN:
253 case OP_NATIVE:
254 {
255 swap=doendian(c);
256 N=0;
257 break;
258 }
259 case OP_STRING:
260 case OP_ZSTRING:
261 {
262 size_t l;
263 const char *a=luaL_checklstring(L,i++,&l);
264 luaL_addlstring(&b,a,l+(c==OP_ZSTRING));
265 break;
266 }
267 PACKSTRING(OP_BSTRING, unsigned char)
268 PACKSTRING(OP_WSTRING, unsigned short)
269 PACKSTRING(OP_SSTRING, size_t)
270 PACKNUMBER(OP_NUMBER, lua_Number)
271 PACKNUMBER(OP_DOUBLE, double)
272 PACKNUMBER(OP_FLOAT, float)
273 PACKNUMBER(OP_CHAR, char)
274 PACKNUMBER(OP_BYTE, unsigned char)
275 PACKNUMBER(OP_SHORT, short)
276 PACKNUMBER(OP_USHORT, unsigned short)
277 PACKNUMBER(OP_INT, int)
278 PACKNUMBER(OP_UINT, unsigned int)
279 PACKNUMBER(OP_LONG, long)
280 PACKNUMBER(OP_ULONG, unsigned long)
281 case OP_HEX:
282 { // doing digit parsing the lpack way
283 unsigned char sbyte = 0;
284 size_t l;
285 unsigned int ii = 0;
286 int odd = 0;
287 const char *a = luaL_checklstring(L, i++, &l);
288 for (ii = 0; ii < l; ii++) {
289 if (isxdigit((int) (unsigned char) a[ii])) {
290 if (isdigit((int) (unsigned char) a[ii])) {
291 sbyte += a[ii] - '0';
292 odd++;
293 } else if (a[ii] >= 'A' && a[ii] <= 'F') {
294 sbyte += a[ii] - 'A' + 10;
295 odd++;
296 } else if (a[ii] >= 'a' && a[ii] <= 'f') {
297 sbyte += a[ii] - 'a' + 10;
298 odd++;
299 }
300 if (odd == 1) {
301 sbyte = sbyte << 4;
302 } else if (odd == 2) {
303 luaL_addlstring(&b, (char *) &sbyte, 1);
304 sbyte = 0;
305 odd = 0;
306 }
307 } else if (isspace(a[ii])) {
308 /* ignore */
309 } else {
310 /* err ... ignore too*/
311 }
312 }
313 if (odd == 1) {
314 luaL_addlstring(&b, (char *) &sbyte, 1);
315 }
316 break;
317 }
318 case ' ': case ',':
319 break;
320 default:
321 badcode(L,c);
322 break;
323 }
324 }
325 luaL_pushresult(&b);
326 return 1;
327 }
328
329 static const luaL_Reg binlib[] =
330 {
331 {"pack", l_pack},
332 {"unpack", l_unpack},
333 {NULL, NULL}
334 };
335
336 LUALIB_API int luaopen_binlib (lua_State *L) {
337 luaL_newlib(L, binlib);
338 return 1;
339 }
340 /*
341 ** Open bin library
342 */
343 int set_bin_library (lua_State *L) {
344
345 luaL_requiref(L, "bin", luaopen_binlib, 1);
346 lua_pop(L, 1);
347 return 1;
348 }
349
Impressum, Datenschutz