/* ** $Id: lundump.c,v 2.22.1.1 2013/04/12 18:48:47 roberto Exp $ ** load precompiled Lua chunks ** See Copyright Notice in lua.h */ #include #define lundump_c #define LUA_CORE #include "lua.h" #include "ldebug.h" #include "ldo.h" #include "lfunc.h" #include "lmem.h" #include "lobject.h" #include "lstring.h" #include "lundump.h" #include "lzio.h" typedef struct { lua_State* L; ZIO* Z; Mbuffer* b; const char* name; } LoadState; static l_noret error(LoadState* S, const char* why) { luaO_pushfstring(S->L,"%s: %s precompiled chunk",S->name,why); luaD_throw(S->L,LUA_ERRSYNTAX); } #define LoadMem(S,b,n,size) LoadBlock(S,b,(n)*(size)) #define LoadByte(S) (lu_byte)LoadChar(S) #define LoadVar(S,x) LoadMem(S,&x,1,sizeof(x)) #define LoadVector(S,b,n,size) LoadMem(S,b,n,size) #if !defined(luai_verifycode) #define luai_verifycode(L,b,f) /* empty */ #endif static void LoadBlock(LoadState* S, void* b, size_t size) { if (luaZ_read(S->Z,b,size)!=0) error(S,"truncated"); } static int LoadChar(LoadState* S) { char x; LoadVar(S,x); return x; } static int LoadInt(LoadState* S) { int x; LoadVar(S,x); if (x<0) error(S,"corrupted"); return x; } static lua_Number LoadNumber(LoadState* S) { lua_Number x; LoadVar(S,x); return x; } static TString* LoadString(LoadState* S) { size_t size; LoadVar(S,size); if (size==0) return NULL; else { char* s=luaZ_openspace(S->L,S->b,size); LoadBlock(S,s,size*sizeof(char)); return luaS_newlstr(S->L,s,size-1); /* remove trailing '\0' */ } } static void LoadCode(LoadState* S, Proto* f) { int n=LoadInt(S); f->code=luaM_newvector(S->L,n,Instruction); f->sizecode=n; LoadVector(S,f->code,n,sizeof(Instruction)); } static void LoadFunction(LoadState* S, Proto* f); static void LoadConstants(LoadState* S, Proto* f) { int i,n; n=LoadInt(S); f->k=luaM_newvector(S->L,n,TValue); f->sizek=n; for (i=0; ik[i]); for (i=0; ik[i]; int t=LoadChar(S); switch (t) { case LUA_TNIL: setnilvalue(o); break; case LUA_TBOOLEAN: setbvalue(o,LoadChar(S)); break; case LUA_TNUMBER: setnvalue(o,LoadNumber(S)); break; case LUA_TSTRING: setsvalue2n(S->L,o,LoadString(S)); break; default: lua_assert(0); } } n=LoadInt(S); f->p=luaM_newvector(S->L,n,Proto*); f->sizep=n; for (i=0; ip[i]=NULL; for (i=0; ip[i]=luaF_newproto(S->L); LoadFunction(S,f->p[i]); } } static void LoadUpvalues(LoadState* S, Proto* f) { int i,n; n=LoadInt(S); f->upvalues=luaM_newvector(S->L,n,Upvaldesc); f->sizeupvalues=n; for (i=0; iupvalues[i].name=NULL; for (i=0; iupvalues[i].instack=LoadByte(S); f->upvalues[i].idx=LoadByte(S); } } static void LoadDebug(LoadState* S, Proto* f) { int i,n; f->source=LoadString(S); n=LoadInt(S); f->lineinfo=luaM_newvector(S->L,n,int); f->sizelineinfo=n; LoadVector(S,f->lineinfo,n,sizeof(int)); n=LoadInt(S); f->locvars=luaM_newvector(S->L,n,LocVar); f->sizelocvars=n; for (i=0; ilocvars[i].varname=NULL; for (i=0; ilocvars[i].varname=LoadString(S); f->locvars[i].startpc=LoadInt(S); f->locvars[i].endpc=LoadInt(S); } n=LoadInt(S); for (i=0; iupvalues[i].name=LoadString(S); } static void LoadFunction(LoadState* S, Proto* f) { f->linedefined=LoadInt(S); f->lastlinedefined=LoadInt(S); f->numparams=LoadByte(S); f->is_vararg=LoadByte(S); f->maxstacksize=LoadByte(S); LoadCode(S,f); LoadConstants(S,f); LoadUpvalues(S,f); LoadDebug(S,f); } /* the code below must be consistent with the code in luaU_header */ #define N0 LUAC_HEADERSIZE #define N1 (sizeof(LUA_SIGNATURE)-sizeof(char)) #define N2 N1+2 #define N3 N2+6 static void LoadHeader(LoadState* S) { lu_byte h[LUAC_HEADERSIZE]; lu_byte s[LUAC_HEADERSIZE]; luaU_header(h); memcpy(s,h,sizeof(char)); /* first char already read */ LoadBlock(S,s+sizeof(char),LUAC_HEADERSIZE-sizeof(char)); if (memcmp(h,s,N0)==0) return; if (memcmp(h,s,N1)!=0) error(S,"not a"); if (memcmp(h,s,N2)!=0) error(S,"version mismatch in"); if (memcmp(h,s,N3)!=0) error(S,"incompatible"); else error(S,"corrupted"); } /* ** load precompiled chunk */ Closure* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name) { LoadState S; Closure* cl; if (*name=='@' || *name=='=') S.name=name+1; else if (*name==LUA_SIGNATURE[0]) S.name="binary string"; else S.name=name; S.L=L; S.Z=Z; S.b=buff; LoadHeader(&S); cl=luaF_newLclosure(L,1); setclLvalue(L,L->top,cl); incr_top(L); cl->l.p=luaF_newproto(L); LoadFunction(&S,cl->l.p); if (cl->l.p->sizeupvalues != 1) { Proto* p=cl->l.p; cl=luaF_newLclosure(L,cl->l.p->sizeupvalues); cl->l.p=p; setclLvalue(L,L->top-1,cl); } luai_verifycode(L,buff,cl->l.p); return cl; } #define MYINT(s) (s[0]-'0') #define VERSION MYINT(LUA_VERSION_MAJOR)*16+MYINT(LUA_VERSION_MINOR) #define FORMAT 0 /* this is the official format */ /* * make header for precompiled chunks * if you change the code below be sure to update LoadHeader and FORMAT above * and LUAC_HEADERSIZE in lundump.h */ void luaU_header (lu_byte* h) { int x=1; memcpy(h,LUA_SIGNATURE,sizeof(LUA_SIGNATURE)-sizeof(char)); h+=sizeof(LUA_SIGNATURE)-sizeof(char); *h++=cast_byte(VERSION); *h++=cast_byte(FORMAT); *h++=cast_byte(*(char*)&x); /* endianness */ *h++=cast_byte(sizeof(int)); *h++=cast_byte(sizeof(size_t)); *h++=cast_byte(sizeof(Instruction)); *h++=cast_byte(sizeof(lua_Number)); *h++=cast_byte(((lua_Number)0.5)==0); /* is lua_Number integral? */ memcpy(h,LUAC_TAIL,sizeof(LUAC_TAIL)-sizeof(char)); }