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00007 #include <string.h>
00008
00009 #define lundump_c
00010 #define LUA_CORE
00011
00012 #include "lua.h"
00013
00014 #include "ldebug.h"
00015 #include "ldo.h"
00016 #include "lfunc.h"
00017 #include "lmem.h"
00018 #include "lobject.h"
00019 #include "lstring.h"
00020 #include "lundump.h"
00021 #include "lzio.h"
00022
00023 typedef struct {
00024 lua_State* L;
00025 ZIO* Z;
00026 Mbuffer* b;
00027 const char* name;
00028 } LoadState;
00029
00030 #ifdef LUAC_TRUST_BINARIES
00031 #define IF(c,s)
00032 #else
00033 #define IF(c,s) if (c) error(S,s)
00034
00035 static void error(LoadState* S, const char* why)
00036 {
00037 luaO_pushfstring(S->L,"%s: %s in precompiled chunk",S->name,why);
00038 luaD_throw(S->L,LUA_ERRSYNTAX);
00039 }
00040 #endif
00041
00042 #define LoadMem(S,b,n,size) LoadBlock(S,b,(n)*(size))
00043 #define LoadByte(S) (lu_byte)LoadChar(S)
00044 #define LoadVar(S,x) LoadMem(S,&x,1,sizeof(x))
00045 #define LoadVector(S,b,n,size) LoadMem(S,b,n,size)
00046
00047 static void LoadBlock(LoadState* S, void* b, size_t size)
00048 {
00049 size_t r=luaZ_read(S->Z,b,size);
00050 IF (r!=0, "unexpected end");
00051 }
00052
00053 static int LoadChar(LoadState* S)
00054 {
00055 char x;
00056 LoadVar(S,x);
00057 return x;
00058 }
00059
00060 static int LoadInt(LoadState* S)
00061 {
00062 int x;
00063 LoadVar(S,x);
00064 IF (x<0, "bad integer");
00065 return x;
00066 }
00067
00068 static lua_Number LoadNumber(LoadState* S)
00069 {
00070 lua_Number x;
00071 LoadVar(S,x);
00072 return x;
00073 }
00074
00075 static TString* LoadString(LoadState* S)
00076 {
00077 size_t size;
00078 LoadVar(S,size);
00079 if (size==0)
00080 return NULL;
00081 else
00082 {
00083 char* s=luaZ_openspace(S->L,S->b,size);
00084 LoadBlock(S,s,size);
00085 return luaS_newlstr(S->L,s,size-1);
00086 }
00087 }
00088
00089 static void LoadCode(LoadState* S, Proto* f)
00090 {
00091 int n=LoadInt(S);
00092 f->code=luaM_newvector(S->L,n,Instruction);
00093 f->sizecode=n;
00094 LoadVector(S,f->code,n,sizeof(Instruction));
00095 }
00096
00097 static Proto* LoadFunction(LoadState* S, TString* p);
00098
00099 static void LoadConstants(LoadState* S, Proto* f)
00100 {
00101 int i,n;
00102 n=LoadInt(S);
00103 f->k=luaM_newvector(S->L,n,TValue);
00104 f->sizek=n;
00105 for (i=0; i<n; i++) setnilvalue(&f->k[i]);
00106 for (i=0; i<n; i++)
00107 {
00108 TValue* o=&f->k[i];
00109 int t=LoadChar(S);
00110 switch (t)
00111 {
00112 case LUA_TNIL:
00113 setnilvalue(o);
00114 break;
00115 case LUA_TBOOLEAN:
00116 setbvalue(o,LoadChar(S));
00117 break;
00118 case LUA_TNUMBER:
00119 setnvalue(o,LoadNumber(S));
00120 break;
00121 case LUA_TSTRING:
00122 setsvalue2n(S->L,o,LoadString(S));
00123 break;
00124 default:
00125 IF (1, "bad constant");
00126 break;
00127 }
00128 }
00129 n=LoadInt(S);
00130 f->p=luaM_newvector(S->L,n,Proto*);
00131 f->sizep=n;
00132 for (i=0; i<n; i++) f->p[i]=NULL;
00133 for (i=0; i<n; i++) f->p[i]=LoadFunction(S,f->source);
00134 }
00135
00136 static void LoadDebug(LoadState* S, Proto* f)
00137 {
00138 int i,n;
00139 n=LoadInt(S);
00140 f->lineinfo=luaM_newvector(S->L,n,int);
00141 f->sizelineinfo=n;
00142 LoadVector(S,f->lineinfo,n,sizeof(int));
00143 n=LoadInt(S);
00144 f->locvars=luaM_newvector(S->L,n,LocVar);
00145 f->sizelocvars=n;
00146 for (i=0; i<n; i++) f->locvars[i].varname=NULL;
00147 for (i=0; i<n; i++)
00148 {
00149 f->locvars[i].varname=LoadString(S);
00150 f->locvars[i].startpc=LoadInt(S);
00151 f->locvars[i].endpc=LoadInt(S);
00152 }
00153 n=LoadInt(S);
00154 f->upvalues=luaM_newvector(S->L,n,TString*);
00155 f->sizeupvalues=n;
00156 for (i=0; i<n; i++) f->upvalues[i]=NULL;
00157 for (i=0; i<n; i++) f->upvalues[i]=LoadString(S);
00158 }
00159
00160 static Proto* LoadFunction(LoadState* S, TString* p)
00161 {
00162 Proto* f=luaF_newproto(S->L);
00163 setptvalue2s(S->L,S->L->top,f); incr_top(S->L);
00164 f->source=LoadString(S); if (f->source==NULL) f->source=p;
00165 f->linedefined=LoadInt(S);
00166 f->lastlinedefined=LoadInt(S);
00167 f->nups=LoadByte(S);
00168 f->numparams=LoadByte(S);
00169 f->is_vararg=LoadByte(S);
00170 f->maxstacksize=LoadByte(S);
00171 LoadCode(S,f);
00172 LoadConstants(S,f);
00173 LoadDebug(S,f);
00174 IF (!luaG_checkcode(f), "bad code");
00175 S->L->top--;
00176 return f;
00177 }
00178
00179 static void LoadHeader(LoadState* S)
00180 {
00181 char h[LUAC_HEADERSIZE];
00182 char s[LUAC_HEADERSIZE];
00183 luaU_header(h);
00184 LoadBlock(S,s,LUAC_HEADERSIZE);
00185 IF (memcmp(h,s,LUAC_HEADERSIZE)!=0, "bad header");
00186 }
00187
00188
00189
00190
00191 Proto* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name)
00192 {
00193 LoadState S;
00194 if (*name=='@' || *name=='=')
00195 S.name=name+1;
00196 else if (*name==LUA_SIGNATURE[0])
00197 S.name="binary string";
00198 else
00199 S.name=name;
00200 S.L=L;
00201 S.Z=Z;
00202 S.b=buff;
00203 LoadHeader(&S);
00204 return LoadFunction(&S,luaS_newliteral(L,"=?"));
00205 }
00206
00207
00208
00209
00210 void luaU_header (char* h)
00211 {
00212 int x=1;
00213 memcpy(h,LUA_SIGNATURE,sizeof(LUA_SIGNATURE)-1);
00214 h+=sizeof(LUA_SIGNATURE)-1;
00215 *h++=(char)LUAC_VERSION;
00216 *h++=(char)LUAC_FORMAT;
00217 *h++=(char)*(char*)&x;
00218 *h++=(char)sizeof(int);
00219 *h++=(char)sizeof(size_t);
00220 *h++=(char)sizeof(Instruction);
00221 *h++=(char)sizeof(lua_Number);
00222 *h++=(char)(((lua_Number)0.5)==0);
00223 }