[proxmark3-svn] / client / pm3_binlib.c

/*
* lpack.c
* a Lua library for packing and unpacking binary data
* Luiz Henrique de Figueiredo <lhf@tecgraf.puc-rio.br>
* 29 Jun 2007 19:27:20
* This code is hereby placed in the public domain.
* with contributions from Ignacio Castao <castanyo@yahoo.es> and
* Roberto Ierusalimschy <roberto@inf.puc-rio.br>.
*/

#define	OP_ZSTRING	'z'		/* zero-terminated string */
#define	OP_BSTRING	'p'		/* string preceded by length byte */
#define	OP_WSTRING	'P'		/* string preceded by length word */
#define	OP_SSTRING	'a'		/* string preceded by length size_t */
#define	OP_STRING	'A'		/* string */
#define	OP_FLOAT	'f'		/* float */
#define	OP_DOUBLE	'd'		/* double */
#define	OP_NUMBER	'n'		/* Lua number */
#define	OP_CHAR		'c'		/* char (1-byte int) */
#define	OP_BYTE		'C'		/* byte = unsigned char (1-byte unsigned int) */
#define	OP_SHORT	's'		/* short (2-byte int) */
#define	OP_USHORT	'S'		/* unsigned short (2-byte unsigned int) */
#define	OP_INT		'i'		/* int (4-byte int) */
#define	OP_UINT		'I'		/* unsigned int (4-byte unsigned int) */
#define	OP_LONG		'l'		/* long (8-byte int) */
#define	OP_ULONG	'L'		/* unsigned long (8-byte unsigned int) */
#define	OP_LITTLEENDIAN	'<'		/* little endian */
#define	OP_BIGENDIAN	'>'		/* big endian */
#define	OP_NATIVE	'='		/* native endian */

#define OP_HEX 'H'

#include <ctype.h>
#include <string.h>
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>

#include "pm3_binlib.h"


static void badcode(lua_State *L, int c)
{
 char s[]="bad code `?'";
 s[sizeof(s)-3]=c;
 luaL_argerror(L,1,s);
}

static int doendian(int c)
{
 int x=1;
 int e=*(char*)&x;
 if (c==OP_LITTLEENDIAN) return !e;
 if (c==OP_BIGENDIAN) return e;
 if (c==OP_NATIVE) return 0;
 return 0;
}

static void doswap(int swap, void *p, size_t n)
{
 if (swap)
 {
  char *a=(char*)p;
  int i,j;
  for (i=0, j=n-1, n=n/2; n--; i++, j--)
  {
   char t=a[i]; a[i]=a[j]; a[j]=t;
  }
 }
}

#define UNPACKNUMBER(OP,T)		\
   case OP:				\
   {					\
    T a;				\
    int m=sizeof(a);			\
    if (i+m>len) { done = 1;	break;}	\
    memcpy(&a,s+i,m);			\
    i+=m;				\
    doswap(swap,&a,m);			\
    lua_pushnumber(L,(lua_Number)a);	\
    ++n;				\
    break;				\
   }

#define UNPACKSTRING(OP,T)		\
   case OP:				\
   {					\
    T l;				\
    int m=sizeof(l);			\
    if (i+m>len) { done = 1;	break; }	\
    memcpy(&l,s+i,m);			\
    doswap(swap,&l,m);			\
    if (i+m+l>len) { done = 1; break;}		\
    i+=m;				\
    lua_pushlstring(L,s+i,l);		\
    i+=l;				\
    ++n;				\
    break;				\
   }

#define HEXDIGITS(DIG) \
 "0123456789ABCDEF"[DIG]

static int l_unpack(lua_State *L) 		/** unpack(f,s, [init]) */
{
 size_t len;
 const char *s=luaL_checklstring(L,2,&len); /* switched s and f */
 const char *f=luaL_checkstring(L,1);
 int i_read = luaL_optint(L,3,1)-1;
 unsigned int i;
 if (i_read >= 0) {
   i = i_read;
 } else {
   i = 0;
 }
 int n=0;
 int swap=0;
 int done=0;
 lua_pushnil(L);
 while (*f && done == 0)
 {
  int c=*f++;
  int N=1;
  if (isdigit((int) (unsigned char) *f))
  {
   N=0;
   while (isdigit((int) (unsigned char) *f)) N=10*N+(*f++)-'0';
   if (N==0 && c==OP_STRING) { lua_pushliteral(L,""); ++n; }
  }
  while (N-- && done == 0) switch (c)
  {
   case OP_LITTLEENDIAN:
   case OP_BIGENDIAN:
   case OP_NATIVE:
   {
    swap=doendian(c);
    N=0;
    break;
   }
   case OP_STRING:
   {
    ++N;
    if (i+N>len) {done = 1; break; }
    lua_pushlstring(L,s+i,N);
    i+=N;
    ++n;
    N=0;
    break;
   }
   case OP_ZSTRING:
   {
    size_t l;
    if (i>=len) {done = 1; break; }
    l=strlen(s+i);
    lua_pushlstring(L,s+i,l);
    i+=l+1;
    ++n;
    break;
   }
   UNPACKSTRING(OP_BSTRING, unsigned char)
   UNPACKSTRING(OP_WSTRING, unsigned short)
   UNPACKSTRING(OP_SSTRING, size_t)
   UNPACKNUMBER(OP_NUMBER, lua_Number)
   UNPACKNUMBER(OP_DOUBLE, double)
   UNPACKNUMBER(OP_FLOAT, float)
   UNPACKNUMBER(OP_CHAR, char)
   UNPACKNUMBER(OP_BYTE, unsigned char)
   UNPACKNUMBER(OP_SHORT, short)
   UNPACKNUMBER(OP_USHORT, unsigned short)
   UNPACKNUMBER(OP_INT, int)
   UNPACKNUMBER(OP_UINT, unsigned int)
   UNPACKNUMBER(OP_LONG, long)
   UNPACKNUMBER(OP_ULONG, unsigned long)
  case OP_HEX:
    {
      luaL_Buffer buf;
      char hdigit = '0';
      int val = 0;
      luaL_buffinit(L,&buf);
      N++;
      if (i+N > len) {done = 1; break;}
      for (unsigned int ii = i; ii < i+N; ii++) {
    val = s[ii] & 0xF0;
    val = val >> 4;
    hdigit = HEXDIGITS(val);
    luaL_addlstring(&buf, &hdigit, 1);

    val = s[ii] & 0x0F;
    hdigit = HEXDIGITS(val);
    luaL_addlstring(&buf, &hdigit, 1);
      }
      luaL_pushresult(&buf);
      n++;
      i += N;
      N = 0;
      break;
    }

   case ' ': case ',':
    break;
   default:
    badcode(L,c);
    break;
  }
 }
 lua_pushnumber(L,i+1);
 lua_replace(L,-n-2);
 return n+1;
}

#define PACKNUMBER(OP,T)			\
   case OP:					\
   {						\
    T a=(T)luaL_checknumber(L,i++);		\
    doswap(swap,&a,sizeof(a));			\
    luaL_addlstring(&b,(char*)&a,sizeof(a));	\
    break;					\
   }

#define PACKSTRING(OP,T)			\
   case OP:					\
   {						\
    size_t l;					\
    const char *a=luaL_checklstring(L,i++,&l);	\
    T ll=(T)l;					\
    doswap(swap,&ll,sizeof(ll));		\
    luaL_addlstring(&b,(char*)&ll,sizeof(ll));	\
    luaL_addlstring(&b,a,l);			\
    break;					\
   }

static int l_pack(lua_State *L) 		/** pack(f,...) */
{
 int i=2;
 const char *f=luaL_checkstring(L,1);
 int swap=0;
 luaL_Buffer b;
 luaL_buffinit(L,&b);
 while (*f)
 {
  int c=*f++;
  int N=1;
  if (isdigit((int) (unsigned char) *f))
  {
   N=0;
   while (isdigit((int) (unsigned char) *f)) N=10*N+(*f++)-'0';
  }
  while (N--) switch (c)
  {
   case OP_LITTLEENDIAN:
   case OP_BIGENDIAN:
   case OP_NATIVE:
   {
    swap=doendian(c);
    N=0;
    break;
   }
   case OP_STRING:
   case OP_ZSTRING:
   {
    size_t l;
    const char *a=luaL_checklstring(L,i++,&l);
    luaL_addlstring(&b,a,l+(c==OP_ZSTRING));
    break;
   }
   PACKSTRING(OP_BSTRING, unsigned char)
   PACKSTRING(OP_WSTRING, unsigned short)
   PACKSTRING(OP_SSTRING, size_t)
   PACKNUMBER(OP_NUMBER, lua_Number)
   PACKNUMBER(OP_DOUBLE, double)
   PACKNUMBER(OP_FLOAT, float)
   PACKNUMBER(OP_CHAR, char)
   PACKNUMBER(OP_BYTE, unsigned char)
   PACKNUMBER(OP_SHORT, short)
   PACKNUMBER(OP_USHORT, unsigned short)
   PACKNUMBER(OP_INT, int)
   PACKNUMBER(OP_UINT, unsigned int)
   PACKNUMBER(OP_LONG, long)
   PACKNUMBER(OP_ULONG, unsigned long)
  case OP_HEX:
    { // doing digit parsing the lpack way
      unsigned char sbyte = 0;
      size_t l;
      unsigned int ii = 0;
      int odd = 0;
      const char *a = luaL_checklstring(L, i++, &l);
      for (ii = 0; ii < l; ii++) {
    if (isxdigit((int) (unsigned char) a[ii])) {
      if (isdigit((int) (unsigned char) a[ii])) {
        sbyte += a[ii] - '0';
        odd++;
      } else if (a[ii] >= 'A' && a[ii] <= 'F') {
        sbyte += a[ii] - 'A' + 10;
        odd++;
      } else if (a[ii] >= 'a' && a[ii] <= 'f') {
        sbyte += a[ii] - 'a' + 10;
        odd++;
      }
      if (odd == 1) {
        sbyte = sbyte << 4;
      } else if (odd == 2) {
        luaL_addlstring(&b, (char *) &sbyte, 1);
        sbyte = 0;
        odd = 0;
      }
    } else if (isspace(a[ii])) {
      /* ignore */
    } else {
      /* err ... ignore too*/
    }
      }
      if (odd == 1) {
    luaL_addlstring(&b, (char *) &sbyte, 1);
      }
      break;
    }
   case ' ': case ',':
    break;
   default:
    badcode(L,c);
    break;
  }
 }
 luaL_pushresult(&b);
 return 1;
}

static const luaL_Reg binlib[] =
{
	{"pack",	l_pack},
	{"unpack",	l_unpack},
	{NULL,	NULL}
};

LUALIB_API int luaopen_binlib (lua_State *L) {
  luaL_newlib(L, binlib);
  return 1;
}
/*
** Open bin library
*/
int set_bin_library (lua_State *L) {

   luaL_requiref(L, "bin", luaopen_binlib, 1);
   lua_pop(L, 1);
  return 1;
}
Commit	Line	Data
f057bddb	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=10N+(*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=10N+(*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