rlm@1: /*
rlm@1: ** $Id: lundump.c,v 2.7.1.4 2008/04/04 19:51:41 roberto Exp $
rlm@1: ** load precompiled Lua chunks
rlm@1: ** See Copyright Notice in lua.h
rlm@1: */
rlm@1: 
rlm@1: #include <string.h>
rlm@1: 
rlm@1: #define lundump_c
rlm@1: #define LUA_CORE
rlm@1: 
rlm@1: #include "lua.h"
rlm@1: 
rlm@1: #include "ldebug.h"
rlm@1: #include "ldo.h"
rlm@1: #include "lfunc.h"
rlm@1: #include "lmem.h"
rlm@1: #include "lobject.h"
rlm@1: #include "lstring.h"
rlm@1: #include "lundump.h"
rlm@1: #include "lzio.h"
rlm@1: 
rlm@1: typedef struct {
rlm@1:  lua_State* L;
rlm@1:  ZIO* Z;
rlm@1:  Mbuffer* b;
rlm@1:  const char* name;
rlm@1: } LoadState;
rlm@1: 
rlm@1: #ifdef LUAC_TRUST_BINARIES
rlm@1: #define IF(c,s)
rlm@1: #define error(S,s)
rlm@1: #else
rlm@1: #define IF(c,s)		if (c) error(S,s)
rlm@1: 
rlm@1: static void error(LoadState* S, const char* why)
rlm@1: {
rlm@1:  luaO_pushfstring(S->L,"%s: %s in precompiled chunk",S->name,why);
rlm@1:  luaD_throw(S->L,LUA_ERRSYNTAX);
rlm@1: }
rlm@1: #endif
rlm@1: 
rlm@1: #define LoadMem(S,b,n,size)	LoadBlock(S,b,(n)*(size))
rlm@1: #define	LoadByte(S)		(lu_byte)LoadChar(S)
rlm@1: #define LoadVar(S,x)		LoadMem(S,&x,1,sizeof(x))
rlm@1: #define LoadVector(S,b,n,size)	LoadMem(S,b,n,size)
rlm@1: 
rlm@1: static void LoadBlock(LoadState* S, void* b, size_t size)
rlm@1: {
rlm@1:  size_t r=luaZ_read(S->Z,b,size);
rlm@1:  IF (r!=0, "unexpected end");
rlm@1: }
rlm@1: 
rlm@1: static int LoadChar(LoadState* S)
rlm@1: {
rlm@1:  char x;
rlm@1:  LoadVar(S,x);
rlm@1:  return x;
rlm@1: }
rlm@1: 
rlm@1: static int LoadInt(LoadState* S)
rlm@1: {
rlm@1:  int x;
rlm@1:  LoadVar(S,x);
rlm@1:  IF (x<0, "bad integer");
rlm@1:  return x;
rlm@1: }
rlm@1: 
rlm@1: static lua_Number LoadNumber(LoadState* S)
rlm@1: {
rlm@1:  lua_Number x;
rlm@1:  LoadVar(S,x);
rlm@1:  return x;
rlm@1: }
rlm@1: 
rlm@1: static TString* LoadString(LoadState* S)
rlm@1: {
rlm@1:  size_t size;
rlm@1:  LoadVar(S,size);
rlm@1:  if (size==0)
rlm@1:   return NULL;
rlm@1:  else
rlm@1:  {
rlm@1:   char* s=luaZ_openspace(S->L,S->b,size);
rlm@1:   LoadBlock(S,s,size);
rlm@1:   return luaS_newlstr(S->L,s,size-1);		/* remove trailing '\0' */
rlm@1:  }
rlm@1: }
rlm@1: 
rlm@1: static void LoadCode(LoadState* S, Proto* f)
rlm@1: {
rlm@1:  int n=LoadInt(S);
rlm@1:  f->code=luaM_newvector(S->L,n,Instruction);
rlm@1:  f->sizecode=n;
rlm@1:  LoadVector(S,f->code,n,sizeof(Instruction));
rlm@1: }
rlm@1: 
rlm@1: static Proto* LoadFunction(LoadState* S, TString* p);
rlm@1: 
rlm@1: static void LoadConstants(LoadState* S, Proto* f)
rlm@1: {
rlm@1:  int i,n;
rlm@1:  n=LoadInt(S);
rlm@1:  f->k=luaM_newvector(S->L,n,TValue);
rlm@1:  f->sizek=n;
rlm@1:  for (i=0; i<n; i++) setnilvalue(&f->k[i]);
rlm@1:  for (i=0; i<n; i++)
rlm@1:  {
rlm@1:   TValue* o=&f->k[i];
rlm@1:   int t=LoadChar(S);
rlm@1:   switch (t)
rlm@1:   {
rlm@1:    case LUA_TNIL:
rlm@1:    	setnilvalue(o);
rlm@1: 	break;
rlm@1:    case LUA_TBOOLEAN:
rlm@1:    	setbvalue(o,LoadChar(S)!=0);
rlm@1: 	break;
rlm@1:    case LUA_TNUMBER:
rlm@1: 	setnvalue(o,LoadNumber(S));
rlm@1: 	break;
rlm@1:    case LUA_TSTRING:
rlm@1: 	setsvalue2n(S->L,o,LoadString(S));
rlm@1: 	break;
rlm@1:    default:
rlm@1: 	error(S,"bad constant");
rlm@1: 	break;
rlm@1:   }
rlm@1:  }
rlm@1:  n=LoadInt(S);
rlm@1:  f->p=luaM_newvector(S->L,n,Proto*);
rlm@1:  f->sizep=n;
rlm@1:  for (i=0; i<n; i++) f->p[i]=NULL;
rlm@1:  for (i=0; i<n; i++) f->p[i]=LoadFunction(S,f->source);
rlm@1: }
rlm@1: 
rlm@1: static void LoadDebug(LoadState* S, Proto* f)
rlm@1: {
rlm@1:  int i,n;
rlm@1:  n=LoadInt(S);
rlm@1:  f->lineinfo=luaM_newvector(S->L,n,int);
rlm@1:  f->sizelineinfo=n;
rlm@1:  LoadVector(S,f->lineinfo,n,sizeof(int));
rlm@1:  n=LoadInt(S);
rlm@1:  f->locvars=luaM_newvector(S->L,n,LocVar);
rlm@1:  f->sizelocvars=n;
rlm@1:  for (i=0; i<n; i++) f->locvars[i].varname=NULL;
rlm@1:  for (i=0; i<n; i++)
rlm@1:  {
rlm@1:   f->locvars[i].varname=LoadString(S);
rlm@1:   f->locvars[i].startpc=LoadInt(S);
rlm@1:   f->locvars[i].endpc=LoadInt(S);
rlm@1:  }
rlm@1:  n=LoadInt(S);
rlm@1:  f->upvalues=luaM_newvector(S->L,n,TString*);
rlm@1:  f->sizeupvalues=n;
rlm@1:  for (i=0; i<n; i++) f->upvalues[i]=NULL;
rlm@1:  for (i=0; i<n; i++) f->upvalues[i]=LoadString(S);
rlm@1: }
rlm@1: 
rlm@1: static Proto* LoadFunction(LoadState* S, TString* p)
rlm@1: {
rlm@1:  Proto* f;
rlm@1:  if (++S->L->nCcalls > LUAI_MAXCCALLS) error(S,"code too deep");
rlm@1:  f=luaF_newproto(S->L);
rlm@1:  setptvalue2s(S->L,S->L->top,f); incr_top(S->L);
rlm@1:  f->source=LoadString(S); if (f->source==NULL) f->source=p;
rlm@1:  f->linedefined=LoadInt(S);
rlm@1:  f->lastlinedefined=LoadInt(S);
rlm@1:  f->nups=LoadByte(S);
rlm@1:  f->numparams=LoadByte(S);
rlm@1:  f->is_vararg=LoadByte(S);
rlm@1:  f->maxstacksize=LoadByte(S);
rlm@1:  LoadCode(S,f);
rlm@1:  LoadConstants(S,f);
rlm@1:  LoadDebug(S,f);
rlm@1:  IF (!luaG_checkcode(f), "bad code");
rlm@1:  S->L->top--;
rlm@1:  S->L->nCcalls--;
rlm@1:  return f;
rlm@1: }
rlm@1: 
rlm@1: static void LoadHeader(LoadState* S)
rlm@1: {
rlm@1:  char h[LUAC_HEADERSIZE];
rlm@1:  char s[LUAC_HEADERSIZE];
rlm@1:  luaU_header(h);
rlm@1:  LoadBlock(S,s,LUAC_HEADERSIZE);
rlm@1:  IF (memcmp(h,s,LUAC_HEADERSIZE)!=0, "bad header");
rlm@1: }
rlm@1: 
rlm@1: /*
rlm@1: ** load precompiled chunk
rlm@1: */
rlm@1: Proto* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name)
rlm@1: {
rlm@1:  LoadState S;
rlm@1:  if (*name=='@' || *name=='=')
rlm@1:   S.name=name+1;
rlm@1:  else if (*name==LUA_SIGNATURE[0])
rlm@1:   S.name="binary string";
rlm@1:  else
rlm@1:   S.name=name;
rlm@1:  S.L=L;
rlm@1:  S.Z=Z;
rlm@1:  S.b=buff;
rlm@1:  LoadHeader(&S);
rlm@1:  return LoadFunction(&S,luaS_newliteral(L,"=?"));
rlm@1: }
rlm@1: 
rlm@1: /*
rlm@1: * make header
rlm@1: */
rlm@1: void luaU_header (char* h)
rlm@1: {
rlm@1:  int x=1;
rlm@1:  memcpy(h,LUA_SIGNATURE,sizeof(LUA_SIGNATURE)-1);
rlm@1:  h+=sizeof(LUA_SIGNATURE)-1;
rlm@1:  *h++=(char)LUAC_VERSION;
rlm@1:  *h++=(char)LUAC_FORMAT;
rlm@1:  *h++=(char)*(char*)&x;				/* endianness */
rlm@1:  *h++=(char)sizeof(int);
rlm@1:  *h++=(char)sizeof(size_t);
rlm@1:  *h++=(char)sizeof(Instruction);
rlm@1:  *h++=(char)sizeof(lua_Number);
rlm@1:  *h++=(char)(((lua_Number)0.5)==0);		/* is lua_Number integral? */
rlm@1: }