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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>
ca363c23 38#include <stdint.h>
f057bddb 39#include "pm3_binlib.h"
40
41
42static 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
49static 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
59static 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
105static 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 }
ca363c23 161
162 UNPACKSTRING(OP_BSTRING, uint8_t)
163 UNPACKSTRING(OP_WSTRING, uint16_t)
164 UNPACKSTRING(OP_SSTRING, uint32_t)
f057bddb 165 UNPACKNUMBER(OP_NUMBER, lua_Number)
166 UNPACKNUMBER(OP_DOUBLE, double)
167 UNPACKNUMBER(OP_FLOAT, float)
ca363c23 168 UNPACKNUMBER(OP_CHAR, int8_t)
169 UNPACKNUMBER(OP_BYTE, uint8_t)
170 UNPACKNUMBER(OP_SHORT, int16_t)
171 UNPACKNUMBER(OP_USHORT, uint16_t)
172 UNPACKNUMBER(OP_INT, int32_t)
173 UNPACKNUMBER(OP_UINT, uint32_t)
174 UNPACKNUMBER(OP_LONG, int64_t)
175 UNPACKNUMBER(OP_ULONG, uint64_t)
f057bddb 176 case OP_HEX:
177 {
178 luaL_Buffer buf;
179 char hdigit = '0';
180 int val = 0;
181 luaL_buffinit(L,&buf);
182 N++;
183 if (i+N > len) {done = 1; break;}
184 for (unsigned int ii = i; ii < i+N; ii++) {
185 val = s[ii] & 0xF0;
186 val = val >> 4;
187 hdigit = HEXDIGITS(val);
188 luaL_addlstring(&buf, &hdigit, 1);
189
190 val = s[ii] & 0x0F;
191 hdigit = HEXDIGITS(val);
192 luaL_addlstring(&buf, &hdigit, 1);
193 }
194 luaL_pushresult(&buf);
195 n++;
196 i += N;
197 N = 0;
198 break;
199 }
200
201 case ' ': case ',':
202 break;
203 default:
204 badcode(L,c);
205 break;
206 }
207 }
208 lua_pushnumber(L,i+1);
209 lua_replace(L,-n-2);
210 return n+1;
211}
212
213#define PACKNUMBER(OP,T) \
214 case OP: \
215 { \
216 T a=(T)luaL_checknumber(L,i++); \
217 doswap(swap,&a,sizeof(a)); \
218 luaL_addlstring(&b,(char*)&a,sizeof(a)); \
219 break; \
220 }
221
222#define PACKSTRING(OP,T) \
223 case OP: \
224 { \
225 size_t l; \
226 const char *a=luaL_checklstring(L,i++,&l); \
227 T ll=(T)l; \
228 doswap(swap,&ll,sizeof(ll)); \
229 luaL_addlstring(&b,(char*)&ll,sizeof(ll)); \
230 luaL_addlstring(&b,a,l); \
231 break; \
232 }
233
234static int l_pack(lua_State *L) /** pack(f,...) */
235{
236 int i=2;
237 const char *f=luaL_checkstring(L,1);
238 int swap=0;
239 luaL_Buffer b;
240 luaL_buffinit(L,&b);
241 while (*f)
242 {
243 int c=*f++;
244 int N=1;
245 if (isdigit((int) (unsigned char) *f))
246 {
247 N=0;
248 while (isdigit((int) (unsigned char) *f)) N=10*N+(*f++)-'0';
249 }
250 while (N--) switch (c)
251 {
252 case OP_LITTLEENDIAN:
253 case OP_BIGENDIAN:
254 case OP_NATIVE:
255 {
256 swap=doendian(c);
257 N=0;
258 break;
259 }
260 case OP_STRING:
261 case OP_ZSTRING:
262 {
263 size_t l;
264 const char *a=luaL_checklstring(L,i++,&l);
265 luaL_addlstring(&b,a,l+(c==OP_ZSTRING));
266 break;
267 }
ca363c23 268 PACKSTRING(OP_BSTRING, uint8_t)
269 PACKSTRING(OP_WSTRING, uint16_t)
270 PACKSTRING(OP_SSTRING, uint32_t)
f057bddb 271 PACKNUMBER(OP_NUMBER, lua_Number)
272 PACKNUMBER(OP_DOUBLE, double)
273 PACKNUMBER(OP_FLOAT, float)
ca363c23 274 PACKNUMBER(OP_CHAR, int8_t)
275 PACKNUMBER(OP_BYTE, uint8_t)
276 PACKNUMBER(OP_SHORT, int16_t)
277 PACKNUMBER(OP_USHORT, uint16_t)
278 PACKNUMBER(OP_INT, int32_t)
279 PACKNUMBER(OP_UINT, uint32_t)
280 PACKNUMBER(OP_LONG, int64_t)
281 PACKNUMBER(OP_ULONG, uint64_t)
f057bddb 282 case OP_HEX:
283 { // doing digit parsing the lpack way
284 unsigned char sbyte = 0;
285 size_t l;
286 unsigned int ii = 0;
287 int odd = 0;
288 const char *a = luaL_checklstring(L, i++, &l);
289 for (ii = 0; ii < l; ii++) {
290 if (isxdigit((int) (unsigned char) a[ii])) {
291 if (isdigit((int) (unsigned char) a[ii])) {
292 sbyte += a[ii] - '0';
293 odd++;
294 } else if (a[ii] >= 'A' && a[ii] <= 'F') {
295 sbyte += a[ii] - 'A' + 10;
296 odd++;
297 } else if (a[ii] >= 'a' && a[ii] <= 'f') {
298 sbyte += a[ii] - 'a' + 10;
299 odd++;
300 }
301 if (odd == 1) {
302 sbyte = sbyte << 4;
303 } else if (odd == 2) {
304 luaL_addlstring(&b, (char *) &sbyte, 1);
305 sbyte = 0;
306 odd = 0;
307 }
308 } else if (isspace(a[ii])) {
309 /* ignore */
310 } else {
311 /* err ... ignore too*/
312 }
313 }
314 if (odd == 1) {
315 luaL_addlstring(&b, (char *) &sbyte, 1);
316 }
317 break;
318 }
319 case ' ': case ',':
320 break;
321 default:
322 badcode(L,c);
323 break;
324 }
325 }
326 luaL_pushresult(&b);
327 return 1;
328}
329
330static const luaL_Reg binlib[] =
331{
332 {"pack", l_pack},
333 {"unpack", l_unpack},
334 {NULL, NULL}
335};
336
337LUALIB_API int luaopen_binlib (lua_State *L) {
338 luaL_newlib(L, binlib);
339 return 1;
340}
341/*
342** Open bin library
343*/
344int set_bin_library (lua_State *L) {
345
346 luaL_requiref(L, "bin", luaopen_binlib, 1);
347 lua_pop(L, 1);
348 return 1;
349}
350
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