misc/liblua/lundump.c
author dag10
Mon, 21 Jan 2013 00:30:18 -0500
changeset 8415 02acf6b92f52
parent 2812 0a24853de796
child 10017 de822cd3df3a
permissions -rw-r--r--
Moved room name edit box from footer to top of page. Also shows room name when in slave mode. Temporarily increased HWForm's min height from 580 to 610.
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/*
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** $Id: lundump.c,v 2.7.1.4 2008/04/04 19:51:41 roberto Exp $
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** load precompiled Lua chunks
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** See Copyright Notice in lua.h
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*/
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#include <string.h>
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#define lundump_c
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#define LUA_CORE
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#include "lua.h"
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#include "ldebug.h"
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#include "ldo.h"
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#include "lfunc.h"
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#include "lmem.h"
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#include "lobject.h"
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#include "lstring.h"
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#include "lundump.h"
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#include "lzio.h"
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typedef struct {
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 lua_State* L;
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 ZIO* Z;
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 Mbuffer* b;
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 const char* name;
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} LoadState;
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#ifdef LUAC_TRUST_BINARIES
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#define IF(c,s)
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#define error(S,s)
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#else
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#define IF(c,s)		if (c) error(S,s)
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static void error(LoadState* S, const char* why)
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{
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 luaO_pushfstring(S->L,"%s: %s in precompiled chunk",S->name,why);
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 luaD_throw(S->L,LUA_ERRSYNTAX);
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}
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#endif
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#define LoadMem(S,b,n,size)	LoadBlock(S,b,(n)*(size))
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#define	LoadByte(S)		(lu_byte)LoadChar(S)
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#define LoadVar(S,x)		LoadMem(S,&x,1,sizeof(x))
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#define LoadVector(S,b,n,size)	LoadMem(S,b,n,size)
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static void LoadBlock(LoadState* S, void* b, size_t size)
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{
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 size_t r=luaZ_read(S->Z,b,size);
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 IF (r!=0, "unexpected end");
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}
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static int LoadChar(LoadState* S)
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{
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 char x;
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 LoadVar(S,x);
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 return x;
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}
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static int LoadInt(LoadState* S)
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{
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 int x;
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 LoadVar(S,x);
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 IF (x<0, "bad integer");
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 return x;
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}
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static lua_Number LoadNumber(LoadState* S)
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{
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 lua_Number x;
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 LoadVar(S,x);
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 return x;
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}
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static TString* LoadString(LoadState* S)
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{
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 size_t size;
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 LoadVar(S,size);
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 if (size==0)
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  return NULL;
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 else
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 {
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  char* s=luaZ_openspace(S->L,S->b,size);
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  LoadBlock(S,s,size);
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  return luaS_newlstr(S->L,s,size-1);		/* remove trailing '\0' */
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 }
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}
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static void LoadCode(LoadState* S, Proto* f)
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{
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 int n=LoadInt(S);
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 f->code=luaM_newvector(S->L,n,Instruction);
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 f->sizecode=n;
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 LoadVector(S,f->code,n,sizeof(Instruction));
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}
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static Proto* LoadFunction(LoadState* S, TString* p);
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static void LoadConstants(LoadState* S, Proto* f)
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{
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 int i,n;
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 n=LoadInt(S);
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 f->k=luaM_newvector(S->L,n,TValue);
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 f->sizek=n;
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 for (i=0; i<n; i++) setnilvalue(&f->k[i]);
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 for (i=0; i<n; i++)
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 {
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  TValue* o=&f->k[i];
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  int t=LoadChar(S);
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  switch (t)
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  {
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   case LUA_TNIL:
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   	setnilvalue(o);
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	break;
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   case LUA_TBOOLEAN:
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   	setbvalue(o,LoadChar(S)!=0);
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	break;
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   case LUA_TNUMBER:
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	setnvalue(o,LoadNumber(S));
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	break;
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   case LUA_TSTRING:
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	setsvalue2n(S->L,o,LoadString(S));
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	break;
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   default:
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	error(S,"bad constant");
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	break;
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  }
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 }
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 n=LoadInt(S);
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 f->p=luaM_newvector(S->L,n,Proto*);
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 f->sizep=n;
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 for (i=0; i<n; i++) f->p[i]=NULL;
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 for (i=0; i<n; i++) f->p[i]=LoadFunction(S,f->source);
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}
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static void LoadDebug(LoadState* S, Proto* f)
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{
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 int i,n;
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 n=LoadInt(S);
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 f->lineinfo=luaM_newvector(S->L,n,int);
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 f->sizelineinfo=n;
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 LoadVector(S,f->lineinfo,n,sizeof(int));
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 n=LoadInt(S);
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 f->locvars=luaM_newvector(S->L,n,LocVar);
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 f->sizelocvars=n;
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 for (i=0; i<n; i++) f->locvars[i].varname=NULL;
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 {
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  f->locvars[i].varname=LoadString(S);
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  f->locvars[i].startpc=LoadInt(S);
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  f->locvars[i].endpc=LoadInt(S);
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 }
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 n=LoadInt(S);
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 f->upvalues=luaM_newvector(S->L,n,TString*);
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 f->sizeupvalues=n;
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 for (i=0; i<n; i++) f->upvalues[i]=NULL;
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 for (i=0; i<n; i++) f->upvalues[i]=LoadString(S);
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}
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static Proto* LoadFunction(LoadState* S, TString* p)
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{
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 Proto* f;
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 if (++S->L->nCcalls > LUAI_MAXCCALLS) error(S,"code too deep");
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 f=luaF_newproto(S->L);
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 setptvalue2s(S->L,S->L->top,f); incr_top(S->L);
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 f->source=LoadString(S); if (f->source==NULL) f->source=p;
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 f->linedefined=LoadInt(S);
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 f->lastlinedefined=LoadInt(S);
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 f->nups=LoadByte(S);
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 f->numparams=LoadByte(S);
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 f->is_vararg=LoadByte(S);
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 f->maxstacksize=LoadByte(S);
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 LoadCode(S,f);
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 LoadConstants(S,f);
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 LoadDebug(S,f);
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 IF (!luaG_checkcode(f), "bad code");
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 S->L->top--;
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 S->L->nCcalls--;
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 return f;
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}
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static void LoadHeader(LoadState* S)
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{
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 char h[LUAC_HEADERSIZE];
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 char s[LUAC_HEADERSIZE];
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 luaU_header(h);
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 LoadBlock(S,s,LUAC_HEADERSIZE);
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 IF (memcmp(h,s,LUAC_HEADERSIZE)!=0, "bad header");
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}
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/*
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** load precompiled chunk
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*/
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Proto* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name)
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{
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 LoadState S;
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 if (*name=='@' || *name=='=')
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  S.name=name+1;
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 else if (*name==LUA_SIGNATURE[0])
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  S.name="binary string";
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 else
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  S.name=name;
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 S.L=L;
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 S.Z=Z;
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 S.b=buff;
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 LoadHeader(&S);
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 return LoadFunction(&S,luaS_newliteral(L,"=?"));
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}
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/*
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* make header
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*/
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void luaU_header (char* h)
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{
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 int x=1;
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 memcpy(h,LUA_SIGNATURE,sizeof(LUA_SIGNATURE)-1);
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 h+=sizeof(LUA_SIGNATURE)-1;
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 *h++=(char)LUAC_VERSION;
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 *h++=(char)LUAC_FORMAT;
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 *h++=(char)*(char*)&x;				/* endianness */
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 *h++=(char)sizeof(int);
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 *h++=(char)sizeof(size_t);
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 *h++=(char)sizeof(Instruction);
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 *h++=(char)sizeof(lua_Number);
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 *h++=(char)(((lua_Number)0.5)==0);		/* is lua_Number integral? */
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}