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/*

** $Id: lundump.c,v 1.71 2011/12/07 10:39:12 lhf 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 void 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)	(f)

#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 Proto* LoadFunction(LoadState* S);

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; 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;

  }

 }

 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]=LoadFunction(S);

}

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; 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; ilocvars[i].varname=NULL;

 for (i=0; 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; iupvalues[i].name=LoadString(S);

}

static Proto* LoadFunction(LoadState* S)

{

 Proto* f=luaF_newproto(S->L);

 setptvalue2s(S->L,S->L->top,f); incr_top(S->L);

 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);

 S->L->top--;

 return 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

*/

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 luai_verifycode(L,buff,LoadFunction(&S));

}

#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));

}