From cec1ffb80b6d482c4d66ce2b56fe5d8c862253b0 Mon Sep 17 00:00:00 2001
From: Luiz Henrique de Figueiredo <lhf@tecgraf.puc-rio.br>
Date: Fri, 1 Mar 1996 00:43:50 -0300
Subject: [PATCH] uses ID_* constants simplified signature checking loads local
 vars

---
 undump.c | 55 ++++++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 40 insertions(+), 15 deletions(-)

diff --git a/undump.c b/undump.c
index d3bde390..d83875a7 100644
--- a/undump.c
+++ b/undump.c
@@ -3,7 +3,7 @@
 ** load bytecodes from files
 */
 
-char *rcs_undump="$Id: undump.c,v 1.5 1996/02/26 19:44:17 lhf Exp lhf $";
+char *rcs_undump="$Id: undump.c,v 1.6 1996/02/28 23:10:46 lhf Exp lhf $";
 
 #include <stdio.h>
 #include <string.h>
@@ -11,7 +11,7 @@ char *rcs_undump="$Id: undump.c,v 1.5 1996/02/26 19:44:17 lhf Exp lhf $";
 
 static void warn(char *s)			/* TODO: remove */
 {
- fprintf(stderr,"luac: %s\n",s);
+ fprintf(stderr,"undump: %s\n",s);
 }
 
 static void panic(char *s)			/* TODO: remove */
@@ -73,45 +73,67 @@ static void LoadFunction(FILE *D)
   Byte *p;
   tf->marked=LoadWord(D);
   tf->fileName=Main->fileName;
-  p=Main->code+tf->marked;			/* TODO: tf->marked=? */
+  p=Main->code+tf->marked;
   c.tf=tf;
   *p++=c.m.c1; *p++=c.m.c2; *p++=c.m.c3; *p++=c.m.c4;
-  lastF->next=tf; lastF=tf;
+  lastF=lastF->next=tf;
  }
+#if 0
+ tf->marked=0;					/* TODO: is this ok? */
+#endif
  tf->code=LoadBlock(tf->size,D);
  while (1)					/* unthread */
  {
   int c=getc(D);
-  if (c=='V')
+  if (c==ID_VAR)				/* global var */
   {
    int i=LoadWord(D);
    char *s=LoadString(D);
    int v=luaI_findsymbolbyname(s);		/* TODO: free s? */
    Unthread(tf->code,i,v);
   }
-  else if (c=='S')
+  else if (c==ID_STR)				/* constant string */
   {
    int i=LoadWord(D);
    char *s=LoadString(D);
    int v=luaI_findconstantbyname(s);		/* TODO: free s? */
    Unthread(tf->code,i,v);
   }
+  else if (c==ID_LOC)				/* local vars */
+  {
+   int n=LoadWord(D);
+   LocVar *v;
+   if (n==0) continue;
+   tf->locvars=v=newvector(n,LocVar);
+   while (n--)
+   {
+    LocLoc(v)=LoadWord(D);
+    LoadString(D);				/* TODO: how to save it? */
+    ++v;
+   }
+  }
   else
   {
    ungetc(c,D);
-   return;
+   break;
   }
  }
 }
 
+static void LoadSignature(FILE *D)
+{
+ char *s=SIGNATURE;
+ while (*s!=0 && getc(D)==*s)
+  ++s;
+ if (*s!=0) panic("bad signature");
+}
+
 static void LoadHeader(FILE *D)			/* TODO: error handling */
 {
- char *s=LoadString(D);
  Word w,tw=TEST_WORD;
  float f,tf=TEST_FLOAT;
- if (strcmp(s,SIGNATURE)!=0) panic("bad signature");
- luaI_free(s);
- getc(D);				/* skip version */
+ LoadSignature(D);
+ getc(D);					/* skip version */
  fread(&w,sizeof(w),1,D);		/* a word for testing byte ordering */
  if (w!=tw) warn("different byte order");
  fread(&f,sizeof(f),1,D);		/* a float for testing byte ordering */
@@ -124,7 +146,7 @@ static void LoadChunk(FILE *D)
  while (1)
  {
   int c=getc(D);
-  if (c=='F') LoadFunction(D); else { ungetc(c,D); break; }
+  if (c==ID_FUN) LoadFunction(D); else { ungetc(c,D); break; }
  }
 #if 1
  {						/* TODO: run Main? */
@@ -140,9 +162,12 @@ void luaI_undump(FILE *D)
  while (1)
  {
   int c=getc(D);
-  if (c==ESC) LoadChunk(D);	else
-  if (c==EOF) return;		else
-  panic("not a lua binary file");
+  if (c==ID_CHUNK)
+   LoadChunk(D);
+  else if (c==EOF)
+   break;
+  else
+   panic("not a lua binary file");
  }
 }