root/src/lua/src/lundump.c

Revision 22d1941d0ca5ba7027cdfa51ce34bd1d8fb1931e, 4.4 kB (checked in by Theo Schlossnagle <jesus@omniti.com>, 6 years ago)

take the version out... it is what it is

  • Property mode set to 100644
Line 
1 /*
2 ** $Id: lundump.c,v 2.7.1.2 2008/01/18 16:39:11 roberto Exp $
3 ** load precompiled Lua chunks
4 ** See Copyright Notice in lua.h
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  UNUSED(r);
52  IF (r!=0, "unexpected end");
53 }
54
55 static int LoadChar(LoadState* S)
56 {
57  char x;
58  LoadVar(S,x);
59  return x;
60 }
61
62 static int LoadInt(LoadState* S)
63 {
64  int x;
65  LoadVar(S,x);
66  IF (x<0, "bad integer");
67  return x;
68 }
69
70 static lua_Number LoadNumber(LoadState* S)
71 {
72  lua_Number x;
73  LoadVar(S,x);
74  return x;
75 }
76
77 static TString* LoadString(LoadState* S)
78 {
79  size_t size;
80  LoadVar(S,size);
81  if (size==0)
82   return NULL;
83  else
84  {
85   char* s=luaZ_openspace(S->L,S->b,size);
86   LoadBlock(S,s,size);
87   return luaS_newlstr(S->L,s,size-1);           /* remove trailing '\0' */
88  }
89 }
90
91 static void LoadCode(LoadState* S, Proto* f)
92 {
93  int n=LoadInt(S);
94  f->code=luaM_newvector(S->L,n,Instruction);
95  f->sizecode=n;
96  LoadVector(S,f->code,n,sizeof(Instruction));
97 }
98
99 static Proto* LoadFunction(LoadState* S, TString* p);
100
101 static void LoadConstants(LoadState* S, Proto* f)
102 {
103  int i,n;
104  n=LoadInt(S);
105  f->k=luaM_newvector(S->L,n,TValue);
106  f->sizek=n;
107  for (i=0; i<n; i++) setnilvalue(&f->k[i]);
108  for (i=0; i<n; i++)
109  {
110   TValue* o=&f->k[i];
111   int t=LoadChar(S);
112   switch (t)
113   {
114    case LUA_TNIL:
115         setnilvalue(o);
116         break;
117    case LUA_TBOOLEAN:
118         setbvalue(o,LoadChar(S));
119         break;
120    case LUA_TNUMBER:
121         setnvalue(o,LoadNumber(S));
122         break;
123    case LUA_TSTRING:
124         setsvalue2n(S->L,o,LoadString(S));
125         break;
126    default:
127         error(S,"bad constant");
128         break;
129   }
130  }
131  n=LoadInt(S);
132  f->p=luaM_newvector(S->L,n,Proto*);
133  f->sizep=n;
134  for (i=0; i<n; i++) f->p[i]=NULL;
135  for (i=0; i<n; i++) f->p[i]=LoadFunction(S,f->source);
136 }
137
138 static void LoadDebug(LoadState* S, Proto* f)
139 {
140  int i,n;
141  n=LoadInt(S);
142  f->lineinfo=luaM_newvector(S->L,n,int);
143  f->sizelineinfo=n;
144  LoadVector(S,f->lineinfo,n,sizeof(int));
145  n=LoadInt(S);
146  f->locvars=luaM_newvector(S->L,n,LocVar);
147  f->sizelocvars=n;
148  for (i=0; i<n; i++) f->locvars[i].varname=NULL;
149  for (i=0; i<n; i++)
150  {
151   f->locvars[i].varname=LoadString(S);
152   f->locvars[i].startpc=LoadInt(S);
153   f->locvars[i].endpc=LoadInt(S);
154  }
155  n=LoadInt(S);
156  f->upvalues=luaM_newvector(S->L,n,TString*);
157  f->sizeupvalues=n;
158  for (i=0; i<n; i++) f->upvalues[i]=NULL;
159  for (i=0; i<n; i++) f->upvalues[i]=LoadString(S);
160 }
161
162 static Proto* LoadFunction(LoadState* S, TString* p)
163 {
164  Proto* f=luaF_newproto(S->L);
165  setptvalue2s(S->L,S->L->top,f); incr_top(S->L);
166  f->source=LoadString(S); if (f->source==NULL) f->source=p;
167  f->linedefined=LoadInt(S);
168  f->lastlinedefined=LoadInt(S);
169  f->nups=LoadByte(S);
170  f->numparams=LoadByte(S);
171  f->is_vararg=LoadByte(S);
172  f->maxstacksize=LoadByte(S);
173  LoadCode(S,f);
174  LoadConstants(S,f);
175  LoadDebug(S,f);
176  IF (!luaG_checkcode(f), "bad code");
177  S->L->top--;
178  return f;
179 }
180
181 static void LoadHeader(LoadState* S)
182 {
183  char h[LUAC_HEADERSIZE];
184  char s[LUAC_HEADERSIZE];
185  luaU_header(h);
186  LoadBlock(S,s,LUAC_HEADERSIZE);
187  IF (memcmp(h,s,LUAC_HEADERSIZE)!=0, "bad header");
188 }
189
190 /*
191 ** load precompiled chunk
192 */
193 Proto* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name)
194 {
195  LoadState S;
196  if (*name=='@' || *name=='=')
197   S.name=name+1;
198  else if (*name==LUA_SIGNATURE[0])
199   S.name="binary string";
200  else
201   S.name=name;
202  S.L=L;
203  S.Z=Z;
204  S.b=buff;
205  LoadHeader(&S);
206  return LoadFunction(&S,luaS_newliteral(L,"=?"));
207 }
208
209 /*
210 * make header
211 */
212 void luaU_header (char* h)
213 {
214  int x=1;
215  memcpy(h,LUA_SIGNATURE,sizeof(LUA_SIGNATURE)-1);
216  h+=sizeof(LUA_SIGNATURE)-1;
217  *h++=(char)LUAC_VERSION;
218  *h++=(char)LUAC_FORMAT;
219  *h++=(char)*(char*)&x;                         /* endianness */
220  *h++=(char)sizeof(int);
221  *h++=(char)sizeof(size_t);
222  *h++=(char)sizeof(Instruction);
223  *h++=(char)sizeof(lua_Number);
224  *h++=(char)(((lua_Number)0.5)==0);             /* is lua_Number integral? */
225 }
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