1 files changed, 258 insertions, 0 deletions

diff --git a/lundump.c b/lundump.c
new file mode 100644
index 00000000..54de011a
--- /dev/null
+++ b/lundump.c
@@ -0,0 +1,258 @@
+/*
+** $Id: lundump.c,v 2.22 2012/05/08 13:53:33 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;
+
+static l_noret 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)  /* empty */
+#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 void LoadFunction(LoadState* S, Proto* f);
+
+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));
+        break;
+   case LUA_TNUMBER:
+        setnvalue(o,LoadNumber(S));
+        break;
+   case LUA_TSTRING:
+        setsvalue2n(S->L,o,LoadString(S));
+        break;
+    default: lua_assert(0);
+  }
+ }
+ 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]=luaF_newproto(S->L);
+  LoadFunction(S,f->p[i]);
+ }
+}
+
+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; i<n; i++) f->upvalues[i].name=NULL;
+ for (i=0; i<n; 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; 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);
+ for (i=0; i<n; i++) f->upvalues[i].name=LoadString(S);
+}
+
+static void LoadFunction(LoadState* S, Proto* f)
+{
+ 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);
+}
+
+/* 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
+*/
+Closure* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name)
+{
+ LoadState S;
+ Closure* cl;
+ 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);
+ cl=luaF_newLclosure(L,1);
+ setclLvalue(L,L->top,cl); incr_top(L);
+ cl->l.p=luaF_newproto(L);
+ LoadFunction(&S,cl->l.p);
+ if (cl->l.p->sizeupvalues != 1)
+ {
+  Proto* p=cl->l.p;
+  cl=luaF_newLclosure(L,cl->l.p->sizeupvalues);
+  cl->l.p=p;
+  setclLvalue(L,L->top-1,cl);
+ }
+ luai_verifycode(L,buff,cl->l.p);
+ return cl;
+}
+
+#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));
+}