1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/lua/lundump.c	Sat Mar 03 11:07:39 2012 -0600
     1.3 @@ -0,0 +1,227 @@
     1.4 +/*
     1.5 +** $Id: lundump.c,v 2.7.1.4 2008/04/04 19:51:41 roberto Exp $
     1.6 +** load precompiled Lua chunks
     1.7 +** See Copyright Notice in lua.h
     1.8 +*/
     1.9 +
    1.10 +#include <string.h>
    1.11 +
    1.12 +#define lundump_c
    1.13 +#define LUA_CORE
    1.14 +
    1.15 +#include "lua.h"
    1.16 +
    1.17 +#include "ldebug.h"
    1.18 +#include "ldo.h"
    1.19 +#include "lfunc.h"
    1.20 +#include "lmem.h"
    1.21 +#include "lobject.h"
    1.22 +#include "lstring.h"
    1.23 +#include "lundump.h"
    1.24 +#include "lzio.h"
    1.25 +
    1.26 +typedef struct {
    1.27 + lua_State* L;
    1.28 + ZIO* Z;
    1.29 + Mbuffer* b;
    1.30 + const char* name;
    1.31 +} LoadState;
    1.32 +
    1.33 +#ifdef LUAC_TRUST_BINARIES
    1.34 +#define IF(c,s)
    1.35 +#define error(S,s)
    1.36 +#else
    1.37 +#define IF(c,s)		if (c) error(S,s)
    1.38 +
    1.39 +static void error(LoadState* S, const char* why)
    1.40 +{
    1.41 + luaO_pushfstring(S->L,"%s: %s in precompiled chunk",S->name,why);
    1.42 + luaD_throw(S->L,LUA_ERRSYNTAX);
    1.43 +}
    1.44 +#endif
    1.45 +
    1.46 +#define LoadMem(S,b,n,size)	LoadBlock(S,b,(n)*(size))
    1.47 +#define	LoadByte(S)		(lu_byte)LoadChar(S)
    1.48 +#define LoadVar(S,x)		LoadMem(S,&x,1,sizeof(x))
    1.49 +#define LoadVector(S,b,n,size)	LoadMem(S,b,n,size)
    1.50 +
    1.51 +static void LoadBlock(LoadState* S, void* b, size_t size)
    1.52 +{
    1.53 + size_t r=luaZ_read(S->Z,b,size);
    1.54 + IF (r!=0, "unexpected end");
    1.55 +}
    1.56 +
    1.57 +static int LoadChar(LoadState* S)
    1.58 +{
    1.59 + char x;
    1.60 + LoadVar(S,x);
    1.61 + return x;
    1.62 +}
    1.63 +
    1.64 +static int LoadInt(LoadState* S)
    1.65 +{
    1.66 + int x;
    1.67 + LoadVar(S,x);
    1.68 + IF (x<0, "bad integer");
    1.69 + return x;
    1.70 +}
    1.71 +
    1.72 +static lua_Number LoadNumber(LoadState* S)
    1.73 +{
    1.74 + lua_Number x;
    1.75 + LoadVar(S,x);
    1.76 + return x;
    1.77 +}
    1.78 +
    1.79 +static TString* LoadString(LoadState* S)
    1.80 +{
    1.81 + size_t size;
    1.82 + LoadVar(S,size);
    1.83 + if (size==0)
    1.84 +  return NULL;
    1.85 + else
    1.86 + {
    1.87 +  char* s=luaZ_openspace(S->L,S->b,size);
    1.88 +  LoadBlock(S,s,size);
    1.89 +  return luaS_newlstr(S->L,s,size-1);		/* remove trailing '\0' */
    1.90 + }
    1.91 +}
    1.92 +
    1.93 +static void LoadCode(LoadState* S, Proto* f)
    1.94 +{
    1.95 + int n=LoadInt(S);
    1.96 + f->code=luaM_newvector(S->L,n,Instruction);
    1.97 + f->sizecode=n;
    1.98 + LoadVector(S,f->code,n,sizeof(Instruction));
    1.99 +}
   1.100 +
   1.101 +static Proto* LoadFunction(LoadState* S, TString* p);
   1.102 +
   1.103 +static void LoadConstants(LoadState* S, Proto* f)
   1.104 +{
   1.105 + int i,n;
   1.106 + n=LoadInt(S);
   1.107 + f->k=luaM_newvector(S->L,n,TValue);
   1.108 + f->sizek=n;
   1.109 + for (i=0; i<n; i++) setnilvalue(&f->k[i]);
   1.110 + for (i=0; i<n; i++)
   1.111 + {
   1.112 +  TValue* o=&f->k[i];
   1.113 +  int t=LoadChar(S);
   1.114 +  switch (t)
   1.115 +  {
   1.116 +   case LUA_TNIL:
   1.117 +   	setnilvalue(o);
   1.118 +	break;
   1.119 +   case LUA_TBOOLEAN:
   1.120 +   	setbvalue(o,LoadChar(S)!=0);
   1.121 +	break;
   1.122 +   case LUA_TNUMBER:
   1.123 +	setnvalue(o,LoadNumber(S));
   1.124 +	break;
   1.125 +   case LUA_TSTRING:
   1.126 +	setsvalue2n(S->L,o,LoadString(S));
   1.127 +	break;
   1.128 +   default:
   1.129 +	error(S,"bad constant");
   1.130 +	break;
   1.131 +  }
   1.132 + }
   1.133 + n=LoadInt(S);
   1.134 + f->p=luaM_newvector(S->L,n,Proto*);
   1.135 + f->sizep=n;
   1.136 + for (i=0; i<n; i++) f->p[i]=NULL;
   1.137 + for (i=0; i<n; i++) f->p[i]=LoadFunction(S,f->source);
   1.138 +}
   1.139 +
   1.140 +static void LoadDebug(LoadState* S, Proto* f)
   1.141 +{
   1.142 + int i,n;
   1.143 + n=LoadInt(S);
   1.144 + f->lineinfo=luaM_newvector(S->L,n,int);
   1.145 + f->sizelineinfo=n;
   1.146 + LoadVector(S,f->lineinfo,n,sizeof(int));
   1.147 + n=LoadInt(S);
   1.148 + f->locvars=luaM_newvector(S->L,n,LocVar);
   1.149 + f->sizelocvars=n;
   1.150 + for (i=0; i<n; i++) f->locvars[i].varname=NULL;
   1.151 + for (i=0; i<n; i++)
   1.152 + {
   1.153 +  f->locvars[i].varname=LoadString(S);
   1.154 +  f->locvars[i].startpc=LoadInt(S);
   1.155 +  f->locvars[i].endpc=LoadInt(S);
   1.156 + }
   1.157 + n=LoadInt(S);
   1.158 + f->upvalues=luaM_newvector(S->L,n,TString*);
   1.159 + f->sizeupvalues=n;
   1.160 + for (i=0; i<n; i++) f->upvalues[i]=NULL;
   1.161 + for (i=0; i<n; i++) f->upvalues[i]=LoadString(S);
   1.162 +}
   1.163 +
   1.164 +static Proto* LoadFunction(LoadState* S, TString* p)
   1.165 +{
   1.166 + Proto* f;
   1.167 + if (++S->L->nCcalls > LUAI_MAXCCALLS) error(S,"code too deep");
   1.168 + f=luaF_newproto(S->L);
   1.169 + setptvalue2s(S->L,S->L->top,f); incr_top(S->L);
   1.170 + f->source=LoadString(S); if (f->source==NULL) f->source=p;
   1.171 + f->linedefined=LoadInt(S);
   1.172 + f->lastlinedefined=LoadInt(S);
   1.173 + f->nups=LoadByte(S);
   1.174 + f->numparams=LoadByte(S);
   1.175 + f->is_vararg=LoadByte(S);
   1.176 + f->maxstacksize=LoadByte(S);
   1.177 + LoadCode(S,f);
   1.178 + LoadConstants(S,f);
   1.179 + LoadDebug(S,f);
   1.180 + IF (!luaG_checkcode(f), "bad code");
   1.181 + S->L->top--;
   1.182 + S->L->nCcalls--;
   1.183 + return f;
   1.184 +}
   1.185 +
   1.186 +static void LoadHeader(LoadState* S)
   1.187 +{
   1.188 + char h[LUAC_HEADERSIZE];
   1.189 + char s[LUAC_HEADERSIZE];
   1.190 + luaU_header(h);
   1.191 + LoadBlock(S,s,LUAC_HEADERSIZE);
   1.192 + IF (memcmp(h,s,LUAC_HEADERSIZE)!=0, "bad header");
   1.193 +}
   1.194 +
   1.195 +/*
   1.196 +** load precompiled chunk
   1.197 +*/
   1.198 +Proto* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name)
   1.199 +{
   1.200 + LoadState S;
   1.201 + if (*name=='@' || *name=='=')
   1.202 +  S.name=name+1;
   1.203 + else if (*name==LUA_SIGNATURE[0])
   1.204 +  S.name="binary string";
   1.205 + else
   1.206 +  S.name=name;
   1.207 + S.L=L;
   1.208 + S.Z=Z;
   1.209 + S.b=buff;
   1.210 + LoadHeader(&S);
   1.211 + return LoadFunction(&S,luaS_newliteral(L,"=?"));
   1.212 +}
   1.213 +
   1.214 +/*
   1.215 +* make header
   1.216 +*/
   1.217 +void luaU_header (char* h)
   1.218 +{
   1.219 + int x=1;
   1.220 + memcpy(h,LUA_SIGNATURE,sizeof(LUA_SIGNATURE)-1);
   1.221 + h+=sizeof(LUA_SIGNATURE)-1;
   1.222 + *h++=(char)LUAC_VERSION;
   1.223 + *h++=(char)LUAC_FORMAT;
   1.224 + *h++=(char)*(char*)&x;				/* endianness */
   1.225 + *h++=(char)sizeof(int);
   1.226 + *h++=(char)sizeof(size_t);
   1.227 + *h++=(char)sizeof(Instruction);
   1.228 + *h++=(char)sizeof(lua_Number);
   1.229 + *h++=(char)(((lua_Number)0.5)==0);		/* is lua_Number integral? */
   1.230 +}