This source file includes following definitions.
- error
- LoadBlock
- LoadChar
- LoadInt
- LoadNumber
- LoadString
- LoadCode
- LoadConstants
- LoadDebug
- LoadFunction
- LoadHeader
- luaU_undump
- luaU_header
1
2
3
4
5
6
7 #include <string.h>
8
9 #define lundump_c
10 #define LUA_CORE
11
12 #include "lua.h"
13
14 #include "ldebug.h"
15 #include "ldo.h"
16 #include "lfunc.h"
17 #include "lmem.h"
18 #include "lobject.h"
19 #include "lstring.h"
20 #include "lundump.h"
21 #include "lzio.h"
22
23 typedef struct {
24 lua_State* L;
25 ZIO* Z;
26 Mbuffer* b;
27 const char* name;
28 } LoadState;
29
30 #ifdef LUAC_TRUST_BINARIES
31 #define IF(c,s)
32 #define error(S,s)
33 #else
34 #define IF(c,s) if (c) error(S,s)
35
36 static void error(LoadState* S, const char* why)
37 {
38 luaO_pushfstring(S->L,"%s: %s in precompiled chunk",S->name,why);
39 luaD_throw(S->L,LUA_ERRSYNTAX);
40 }
41 #endif
42
43 #define LoadMem(S,b,n,size) LoadBlock(S,b,(n)*(size))
44 #define LoadByte(S) (lu_byte)LoadChar(S)
45 #define LoadVar(S,x) LoadMem(S,&x,1,sizeof(x))
46 #define LoadVector(S,b,n,size) LoadMem(S,b,n,size)
47
48 static void LoadBlock(LoadState* S, void* b, size_t size)
49 {
50 size_t r=luaZ_read(S->Z,b,size);
51 IF (r!=0, "unexpected end");
52 }
53
54 static int LoadChar(LoadState* S)
55 {
56 char x;
57 LoadVar(S,x);
58 return x;
59 }
60
61 static int LoadInt(LoadState* S)
62 {
63 int x;
64 LoadVar(S,x);
65 IF (x<0, "bad integer");
66 return x;
67 }
68
69 static lua_Number LoadNumber(LoadState* S)
70 {
71 lua_Number x;
72 LoadVar(S,x);
73 return x;
74 }
75
76 static TString* LoadString(LoadState* S)
77 {
78 size_t size;
79 LoadVar(S,size);
80 if (size==0)
81 return NULL;
82 else
83 {
84 char* s=luaZ_openspace(S->L,S->b,size);
85 LoadBlock(S,s,size);
86 return luaS_newlstr(S->L,s,size-1);
87 }
88 }
89
90 static void LoadCode(LoadState* S, Proto* f)
91 {
92 int n=LoadInt(S);
93 f->code=luaM_newvector(S->L,n,Instruction);
94 f->sizecode=n;
95 LoadVector(S,f->code,n,sizeof(Instruction));
96 }
97
98 static Proto* LoadFunction(LoadState* S, TString* p);
99
100 static void LoadConstants(LoadState* S, Proto* f)
101 {
102 int i,n;
103 n=LoadInt(S);
104 f->k=luaM_newvector(S->L,n,TValue);
105 f->sizek=n;
106 for (i=0; i<n; i++) setnilvalue(&f->k[i]);
107 for (i=0; i<n; i++)
108 {
109 TValue* o=&f->k[i];
110 int t=LoadChar(S);
111 switch (t)
112 {
113 case LUA_TNIL:
114 setnilvalue(o);
115 break;
116 case LUA_TBOOLEAN:
117 setbvalue(o,LoadChar(S)!=0);
118 break;
119 case LUA_TNUMBER:
120 setnvalue(o,LoadNumber(S));
121 break;
122 case LUA_TSTRING:
123 setsvalue2n(S->L,o,LoadString(S));
124 break;
125 default:
126 error(S,"bad constant");
127 break;
128 }
129 }
130 n=LoadInt(S);
131 f->p=luaM_newvector(S->L,n,Proto*);
132 f->sizep=n;
133 for (i=0; i<n; i++) f->p[i]=NULL;
134 for (i=0; i<n; i++) f->p[i]=LoadFunction(S,f->source);
135 }
136
137 static void LoadDebug(LoadState* S, Proto* f)
138 {
139 int i,n;
140 n=LoadInt(S);
141 f->lineinfo=luaM_newvector(S->L,n,int);
142 f->sizelineinfo=n;
143 LoadVector(S,f->lineinfo,n,sizeof(int));
144 n=LoadInt(S);
145 f->locvars=luaM_newvector(S->L,n,LocVar);
146 f->sizelocvars=n;
147 for (i=0; i<n; i++) f->locvars[i].varname=NULL;
148 for (i=0; i<n; i++)
149 {
150 f->locvars[i].varname=LoadString(S);
151 f->locvars[i].startpc=LoadInt(S);
152 f->locvars[i].endpc=LoadInt(S);
153 }
154 n=LoadInt(S);
155 f->upvalues=luaM_newvector(S->L,n,TString*);
156 f->sizeupvalues=n;
157 for (i=0; i<n; i++) f->upvalues[i]=NULL;
158 for (i=0; i<n; i++) f->upvalues[i]=LoadString(S);
159 }
160
161 static Proto* LoadFunction(LoadState* S, TString* p)
162 {
163 Proto* f;
164 if (++S->L->nCcalls > LUAI_MAXCCALLS) error(S,"code too deep");
165 f=luaF_newproto(S->L);
166 setptvalue2s(S->L,S->L->top,f); incr_top(S->L);
167 f->source=LoadString(S); if (f->source==NULL) f->source=p;
168 f->linedefined=LoadInt(S);
169 f->lastlinedefined=LoadInt(S);
170 f->nups=LoadByte(S);
171 f->numparams=LoadByte(S);
172 f->is_vararg=LoadByte(S);
173 f->maxstacksize=LoadByte(S);
174 LoadCode(S,f);
175 LoadConstants(S,f);
176 LoadDebug(S,f);
177 IF (!luaG_checkcode(f), "bad code");
178 S->L->top--;
179 S->L->nCcalls--;
180 return f;
181 }
182
183 static void LoadHeader(LoadState* S)
184 {
185 char h[LUAC_HEADERSIZE];
186 char s[LUAC_HEADERSIZE];
187 luaU_header(h);
188 LoadBlock(S,s,LUAC_HEADERSIZE);
189 IF (memcmp(h,s,LUAC_HEADERSIZE)!=0, "bad header");
190 }
191
192
193
194
195 LUAI_FUNC Proto* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name)
196 {
197 LoadState S;
198 if (*name=='@' || *name=='=')
199 S.name=name+1;
200 else if (*name==LUA_SIGNATURE[0])
201 S.name="binary string";
202 else
203 S.name=name;
204 S.L=L;
205 S.Z=Z;
206 S.b=buff;
207 LoadHeader(&S);
208 return LoadFunction(&S,luaS_newliteral(L,"=?"));
209 }
210
211
212
213
214 LUAI_FUNC void luaU_header (char* h)
215 {
216 int x=1;
217 memcpy(h,LUA_SIGNATURE,sizeof(LUA_SIGNATURE)-1);
218 h+=sizeof(LUA_SIGNATURE)-1;
219 *h++=(char)LUAC_VERSION;
220 *h++=(char)LUAC_FORMAT;
221 *h++=(char)*(char*)&x;
222 *h++=(char)sizeof(int);
223 *h++=(char)sizeof(size_t);
224 *h++=(char)sizeof(Instruction);
225 *h++=(char)sizeof(lua_Number);
226 *h++=(char)(((lua_Number)0.5)==0);
227 }