/*** $Id: lundump.c,v 2.22 2012/05/08 13:53:33 roberto Exp $** load precompiled Lua chunks** See Copyright Notice in lua.h*/ #include <string.h> #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; i<n; i++) setnilvalue(&f->k[i]); for (i=0; i<n; i++) {  TValue* o=&f->k[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; i<n; i++) f->p[i]=NULL; for (i=0; i<n; i++) {  f->p[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; i<n; i++) f->upvalues[i].name=NULL; for (i=0; i<n; i++) {  f->upvalues[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; i<n; i++) f->locvars[i].varname=NULL; for (i=0; i<n; i++) {  f->locvars[i].varname=LoadString(S);  f->locvars[i].startpc=LoadInt(S);  f->locvars[i].endpc=LoadInt(S); } n=LoadInt(S); for (i=0; i<n; i++) f->upvalues[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));}