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now swaps bytes (but need to make it more robust)

This commit is contained in:
Luiz Henrique de Figueiredo 1996-03-05 22:41:18 -03:00
parent ef94999647
commit 852b919465
1 changed files with 24 additions and 5 deletions
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29
undump.c
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@ -3,12 +3,15 @@
** load bytecodes from files
*/
char *rcs_undump="$Id: undump.c,v 1.6 1996/02/28 23:10:46 lhf Exp lhf $";
char *rcs_undump="$Id: undump.c,v 1.7 1996/03/01 03:43:50 lhf Exp lhf $";
#include <stdio.h>
#include <string.h>
#include "luac.h"
static int swapword=0;
static int swapfloat=0;
static void warn(char *s) /* TODO: remove */
{
fprintf(stderr,"undump: %s\n",s);
@ -38,6 +41,12 @@ static int LoadWord(FILE *D)
{
Word w;
fread(&w,sizeof(w),1,D);
if (swapword)
{
Byte *p=&w;
Byte t;
t=p[0]; p[0]=p[1]; p[1]=t;
}
return w;
}
@ -82,6 +91,7 @@ static void LoadFunction(FILE *D)
tf->marked=0; /* TODO: is this ok? */
#endif
tf->code=LoadBlock(tf->size,D);
if (swapword || swapfloat) FixCode(tf->code,tf->code+tf->size);
while (1) /* unthread */
{
int c=getc(D);
@ -135,9 +145,17 @@ static void LoadHeader(FILE *D) /* TODO: error handling */
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");
if (w!=tw)
{
swapword=1;
warn("different byte order");
}
fread(&f,sizeof(f),1,D); /* a float for testing byte ordering */
if (f!=tf) warn("different float representation");
if (f!=tf)
{
swapfloat=1;
if (f!=tf) warn("different float representation");
}
}
static void LoadChunk(FILE *D)
@ -173,11 +191,12 @@ void luaI_undump(FILE *D)
int main(int argc, char* argv[])
{
FILE *f=freopen("luac.out","rb",stdin);
char* fn=(argc>1)? argv[1] : "luac.out";
FILE *f=freopen(fn,"rb",stdin);
if (f==NULL)
{
fprintf(stderr,"undump: cannot open ");
perror("luac.out");
perror(fn);
exit(1);
}
luaI_undump(stdin);