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/*
** undump.c
** load bytecodes from files
*/
char *rcs_undump="$Id: undump.c,v 1.4 1996/02/24 16:44:28 lhf Exp lhf $";
#include <stdio.h>
#include <string.h>
#include "luac.h"
static void warn(char *s) /* TODO: remove */
{
fprintf(stderr,"luac: %s\n",s);
}
static void panic(char *s) /* TODO: remove */
{
warn(s);
exit(1);
}
static void Unthread(Byte *p, int i, int v)
{
while (i!=0)
{
CodeWord c;
Byte *q=p+i;
get_word(c,q);
q=p+i;
i=c.w;
c.w=v;
q[0]=c.m.c1;
q[1]=c.m.c2;
}
}
static int LoadWord(FILE *D)
{
Word w;
fread(&w,sizeof(w),1,D);
return w;
}
static char* LoadBlock(int size, FILE *D)
{
char *b=luaI_malloc(size);
fread(b,size,1,D);
return b;
}
static char* LoadString(FILE *D)
{
return LoadBlock(LoadWord(D),D);
}
static TFunc *Main=NULL;
static TFunc *lastF=NULL;
static void LoadFunction(FILE *D)
{
TFunc *tf=new(TFunc);
tf->size=LoadWord(D); /* TODO: Long? */
tf->marked=LoadWord(D);
tf->lineDefined=LoadWord(D);
tf->fileName=LoadString(D); /* TODO: not needed if not main */
tf->code=LoadBlock(tf->size,D);
tf->next=NULL;
if (tf->lineDefined==0) /* new main */
Main=lastF=tf;
else /* fix PUSHFUNCTION */
{
CodeCode c;
Byte *p=Main->code+tf->marked; /* TODO: 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;
}
while (1) /* unthread */
{
int c=getc(D);
if (c=='V')
{
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')
{
int i=LoadWord(D);
char *s=LoadString(D);
int v=luaI_findconstantbyname(s); /* TODO: free s? */
Unthread(tf->code,i,v);
}
else
{
ungetc(c,D);
return;
}
}
}
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 */
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 */
if (f!=tf) warn("different float representation");
}
static void LoadChunk(FILE *D)
{
LoadHeader(D);
while (1)
{
int c=getc(D);
if (c=='F') LoadFunction(D); else { ungetc(c,D); break; }
}
#if 1
{ /* TODO: run Main? */
TFunc *tf;
for (tf=Main; tf!=NULL; tf=tf->next)
PrintFunction(tf);
}
#endif
}
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");
}
}
int main(int argc, char* argv[])
{
FILE *f=freopen("luac.out","rb",stdin);
if (f==NULL)
{
fprintf(stderr,"undump: cannot open ");
perror("luac.out");
exit(1);
}
luaI_undump(stdin);
return 0;
}
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