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/*
** undump.c
** load bytecodes from files
*/
char* rcs_undump="$Id: undump.c,v 1.8 1996/03/06 01:41:18 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);
}
static void panic(char* s) /* TODO: remove */
{
warn(s);
exit(1);
}
static void Unthread(Byte* code, int i, int v)
{
while (i!=0)
{
CodeWord c;
Byte* p=code+i;
get_word(c,p);
i=c.w;
c.w=v;
p[-2]=c.m.c1;
p[-1]=c.m.c2;
}
}
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;
}
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->next=NULL;
tf->locvars=NULL;
tf->size=LoadWord(D); /* TODO: Long? */
tf->lineDefined=LoadWord(D);
if (IsMain(tf)) /* new main */
{
tf->fileName=LoadString(D);
Main=lastF=tf;
}
else /* fix PUSHFUNCTION */
{
CodeCode c;
Byte* p;
tf->marked=LoadWord(D);
tf->fileName=Main->fileName;
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=lastF->next=tf;
}
#if 0
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);
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==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
{
ungetc(c,D);
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 */
{
Word w,tw=TEST_WORD;
float f,tf=TEST_FLOAT;
LoadSignature(D);
getc(D); /* skip version */
fread(&w,sizeof(w),1,D); /* a word for testing byte ordering */
if (w!=tw)
{
swapword=1;
warn("different byte order");
}
fread(&f,sizeof(f),1,D); /* a float for testing byte ordering */
if (f!=tf)
{
swapfloat=1;
if (f!=tf) warn("different float representation");
}
}
static void LoadChunk(FILE* D)
{
LoadHeader(D);
while (1)
{
int c=getc(D);
if (c==ID_FUN) 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==ID_CHUNK)
LoadChunk(D);
else if (c==EOF)
break;
else
panic("not a lua binary file");
}
}
int main(int argc, char* argv[])
{
char* fn=(argc>1)? argv[1] : "luac.out";
FILE* f=freopen(fn,"rb",stdin);
if (f==NULL)
{
fprintf(stderr,"undump: cannot open ");
perror(fn);
exit(1);
}
luaI_undump(stdin);
return 0;
}
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