final version (by lhf)

lundump.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lundump.c,v 1.29 2000/06/28 14:12:55 lhf Exp lhf $
+** $Id: lundump.c,v 1.31 2000/09/19 18:18:38 lhf Exp $
 ** load bytecodes from files
 ** See Copyright Notice in lua.h
 */
@@ -13,11 +13,9 @@
 #include "lstring.h"
 #include "lundump.h"
 
-#define	LoadVector(L,b,n,s,Z)	LoadBlock(L,b,(n)*(s),Z)
-#define	LoadBlock(L,b,size,Z)	ezread(L,Z,b,size)
 #define	LoadByte		ezgetc
 
-static const char* ZNAME(ZIO* Z)
+static const char* ZNAME (ZIO* Z)
 {
  const char* s=zname(Z);
  return (*s=='@') ? s+1 : s;
@@ -41,40 +39,53 @@ static void ezread (lua_State* L, ZIO* Z, void* b, int n)
  if (r!=0) unexpectedEOZ(L,Z);
 }
 
-static void LoadReverse (lua_State* L, void* b, size_t size, ZIO* Z)
+static void LoadBlock (lua_State* L, void* b, size_t size, ZIO* Z, int swap)
 {
- char *p=(char *) b+size;
+ if (swap)
+ {
+  char *p=(char *) b+size-1;
   int n=size;
- while (n--) *p--=ezgetc(L,Z);
+  while (n--) *p--=(char)ezgetc(L,Z);
+ }
+ else
+  ezread(L,Z,b,size);
+}
+
+static void LoadVector (lua_State* L, void* b, int m, size_t size, ZIO* Z, int swap)
+{
+ if (swap)
+ {
+  char *q=(char *) b;
+  while (m--)
+  {
+   char *p=q+size-1;
+   int n=size;
+   while (n--) *p--=(char)ezgetc(L,Z);
+   q+=size;
+  }
+ }
+ else
+  ezread(L,Z,b,m*size);
 }
 
 static int LoadInt (lua_State* L, ZIO* Z, int swap)
 {
  int x;
- if (swap)
+ LoadBlock(L,&x,sizeof(x),Z,swap);
-  LoadReverse(L,&x,sizeof(x),Z);
- else
-  LoadBlock(L,&x,sizeof(x),Z);
  return x;
 }
 
 static size_t LoadSize (lua_State* L, ZIO* Z, int swap)
 {
  size_t x;
- if (swap)
+ LoadBlock(L,&x,sizeof(x),Z,swap);
-  LoadReverse(L,&x,sizeof(x),Z);
- else
-  LoadBlock(L,&x,sizeof(x),Z);
  return x;
 }
 
 static Number LoadNumber (lua_State* L, ZIO* Z, int swap)
 {
  Number x;
- if (swap)
+ LoadBlock(L,&x,sizeof(x),Z,swap);
-  LoadReverse(L,&x,sizeof(x),Z);
- else
-  LoadBlock(L,&x,sizeof(x),Z);
  return x;
 }
 
@@ -86,7 +97,7 @@ static TString* LoadString (lua_State* L, ZIO* Z, int swap)
  else
  {
   char* s=luaO_openspace(L,size);
-  LoadBlock(L,s,size,Z);
+  LoadBlock(L,s,size,Z,0);
   return luaS_newlstr(L,s,size-1);	/* remove trailing '\0' */
  }
 }
@@ -95,10 +106,7 @@ static void LoadCode (lua_State* L, Proto* tf, ZIO* Z, int swap)
 {
  int size=LoadInt(L,Z,swap);
  tf->code=luaM_newvector(L,size,Instruction);
- LoadVector(L,tf->code,size,sizeof(*tf->code),Z);
+ LoadVector(L,tf->code,size,sizeof(*tf->code),Z,swap);
-#if 0
- if (swap) SwapBytes(tf->code,sizeof(*tf->code),size);
-#endif
  if (tf->code[size-1]!=OP_END) luaO_verror(L,"bad code in `%.255s'",ZNAME(Z));
 }
 
@@ -120,10 +128,7 @@ static void LoadLines (lua_State* L, Proto* tf, ZIO* Z, int swap)
  int n=LoadInt(L,Z,swap);
  if (n==0) return;
  tf->lineinfo=luaM_newvector(L,n,int);
- LoadVector(L,tf->lineinfo,n,sizeof(*tf->lineinfo),Z);
+ LoadVector(L,tf->lineinfo,n,sizeof(*tf->lineinfo),Z,swap);
-#if 0
- if (swap) SwapBytes(tf->lineinfo,sizeof(*tf->lineinfo),n);
-#endif
 }
 
 static Proto* LoadFunction (lua_State* L, ZIO* Z, int swap);
@@ -137,9 +142,7 @@ static void LoadConstants (lua_State* L, Proto* tf, ZIO* Z, int swap)
   tf->kstr[i]=LoadString(L,Z,swap);
  tf->nknum=n=LoadInt(L,Z,swap);
  tf->knum=luaM_newvector(L,n,Number);
- LoadVector(L,tf->knum,n,sizeof(*tf->knum),Z);
+ LoadVector(L,tf->knum,n,sizeof(*tf->knum),Z,swap);
- if (swap)
-  for (i=0; i<n; i++) tf->knum[i]=LoadNumber(L,Z,swap); /* TODO */
  tf->nkproto=n=LoadInt(L,Z,swap);
  tf->kproto=luaM_newvector(L,n,Proto*);
  for (i=0; i<n; i++)
@@ -195,6 +198,7 @@ static int LoadHeader (lua_State* L, ZIO* Z)
 	"  read version %d.%d; expected at least %d.%d",
 	ZNAME(Z),V(version),V(VERSION));
  swap=(luaU_endianess()!=ezgetc(L,Z));	/* need to swap bytes? */
+if (swap) puts("swap!");
  TESTSIZE(sizeof(int));
  TESTSIZE(sizeof(size_t));
  TESTSIZE(sizeof(Instruction));