/*** $Id: lundump.c,v 2.7.1.4 2008/04/04 19:51:41 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;#ifdef LUAC_TRUST_BINARIES#define IF(c,s)#define error(S,s)#else#define IF(c,s)		if (c) error(S,s)static void error(LoadState* S, const char* why){ luaO_pushfstring(S->L,"%s: %s in precompiled chunk",S->name,why); luaD_throw(S->L,LUA_ERRSYNTAX);}#endif#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)static void LoadBlock(LoadState* S, void* b, size_t size){ size_t r=luaZ_read(S->Z,b,size); IF (r!=0, "unexpected end");}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, "bad integer"); 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);  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 Proto* LoadFunction(LoadState* S, TString* p);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)!=0);	break;   case LUA_TNUMBER:	setnvalue(o,LoadNumber(S));	break;   case LUA_TSTRING:	setsvalue2n(S->L,o,LoadString(S));	break;   default:	error(S,"bad constant");	break;  } } 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]=LoadFunction(S,f->source);}static void LoadDebug(LoadState* S, Proto* f){ int i,n; 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); f->upvalues=luaM_newvector(S->L,n,TString*); f->sizeupvalues=n; for (i=0; i<n; i++) f->upvalues[i]=NULL; for (i=0; i<n; i++) f->upvalues[i]=LoadString(S);}static Proto* LoadFunction(LoadState* S, TString* p){ Proto* f; if (++S->L->nCcalls > LUAI_MAXCCALLS) error(S,"code too deep"); f=luaF_newproto(S->L); setptvalue2s(S->L,S->L->top,f); incr_top(S->L); f->source=LoadString(S); if (f->source==NULL) f->source=p; f->linedefined=LoadInt(S); f->lastlinedefined=LoadInt(S); f->nups=LoadByte(S); f->numparams=LoadByte(S); f->is_vararg=LoadByte(S); f->maxstacksize=LoadByte(S); LoadCode(S,f); LoadConstants(S,f); LoadDebug(S,f); IF (!luaG_checkcode(f), "bad code"); S->L->top--; S->L->nCcalls--; return f;}static void LoadHeader(LoadState* S){ char h[LUAC_HEADERSIZE]; char s[LUAC_HEADERSIZE]; luaU_header(h); LoadBlock(S,s,LUAC_HEADERSIZE); IF (memcmp(h,s,LUAC_HEADERSIZE)!=0, "bad header");}/*** load precompiled chunk*/Proto* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name){ LoadState S; 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); return LoadFunction(&S,luaS_newliteral(L,"=?"));}/** make header*/void luaU_header (char* h){ int x=1; memcpy(h,LUA_SIGNATURE,sizeof(LUA_SIGNATURE)-1); h+=sizeof(LUA_SIGNATURE)-1; *h++=(char)LUAC_VERSION; *h++=(char)LUAC_FORMAT; *h++=(char)*(char*)&x;				/* endianness */ *h++=(char)sizeof(int); *h++=(char)sizeof(size_t); *h++=(char)sizeof(Instruction); *h++=(char)sizeof(lua_Number); *h++=(char)(((lua_Number)0.5)==0);		/* is lua_Number integral? */}