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/*
** undump.c
** load bytecodes from files
*/
char *rcs_undump="$Id$";
#include <stdio.h>
#include <string.h>
#include "luac.h"
static void warn(char *s)
{
fprintf(stderr,"luac: %s\n",s);
}
static void panic(char *s)
{
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 char* LoadBlock(int size, FILE *D)
{
char *b=luaI_malloc(size);
fread(b,size,1,D);
return b;
}
static int LoadWord(FILE *D)
{
Word w;
fread(&w,sizeof(w),1,D);
return w;
}
static char* LoadString(FILE *D)
{
return LoadBlock(LoadWord(D),D);
}
static char* LoadCode(int size, FILE *D)
{
return LoadBlock(size,D);
}
static TFunc* LoadFunction(FILE *D)
{
TFunc *tf=new(TFunc);
tf->size=LoadWord(D);
tf->marked=LoadWord(D);
tf->lineDefined=LoadWord(D);
tf->fileName=LoadString(D);
tf->code=LoadCode(tf->size,D);
while (1)
{
int c=getc(D);
if (c=='V')
{
int i=LoadWord(D);
char *s=LoadString(D);
int v=luaI_findsymbolbyname(s);
Unthread(tf->code,i,v);
}
else if (c=='S')
{
int i=LoadWord(D);
char *s=LoadString(D);
int v=luaI_findconstantbyname(s);
Unthread(tf->code,i,v);
}
else
{
PrintFunction(tf);
ungetc(c,D);
return tf;
}
}
}
static void LoadHeader(FILE *D)
{
char *s=LoadString(D);
Word w,tw=TEST_WORD;
float f,tf=TEST_FLOAT;
if (strcmp(s,SIGNATURE)!=0) panic("bad signature");
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); return; }
}
}
void 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[])
{
Undump(stdin);
return 0;
}
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