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/*
** $Id: lundump.c,v 1.4 1998/01/13 20:05:24 lhf Exp $
** load bytecodes from files
** See Copyright Notice in lua.h
*/
#include <stdio.h>
#include "lauxlib.h"
#include "lfunc.h"
#include "lmem.h"
#include "lstring.h"
#include "lundump.h"
typedef struct {
ZIO* Z;
int SwapNumber;
int LoadFloat;
} Sundump;
static void unexpectedEOZ(ZIO* Z)
{
luaL_verror("unexpected end of binary file %s",Z->name);
}
static int ezgetc(ZIO* Z)
{
int c=zgetc(Z);
if (c==EOZ) unexpectedEOZ(Z);
return c;
}
static int ezread(ZIO* Z, void* b, int n)
{
int r=zread(Z,b,n);
if (r!=0) unexpectedEOZ(Z);
return r;
}
static int LoadWord(ZIO* Z)
{
int hi=ezgetc(Z);
int lo=ezgetc(Z);
return (hi<<8)|lo;
}
static void* LoadBlock(int size, ZIO* Z)
{
void* b=luaM_malloc(size);
ezread(Z,b,size);
return b;
}
static int LoadSize(ZIO* Z)
{
int hi=LoadWord(Z);
int lo=LoadWord(Z);
int s=(hi<<16)|lo;
if (hi!=0 && s==lo)
luaL_verror("code too long (%ld bytes)",(hi<<16)|(long)lo);
return s;
}
static char* LoadString(ZIO* Z)
{
int size=LoadWord(Z);
if (size==0)
return NULL;
else
{
char* b=luaL_openspace(size);
ezread(Z,b,size);
return b;
}
}
static TaggedString* LoadTString(ZIO* Z)
{
char* s=LoadString(Z);
return (s==NULL) ? NULL : luaS_new(s);
}
static void SwapFloat(float* f)
{
Byte* p=(Byte*)f;
Byte* q=p+sizeof(float)-1;
Byte t;
t=*p; *p++=*q; *q--=t;
t=*p; *p++=*q; *q--=t;
}
static void SwapDouble(double* f)
{
Byte* p=(Byte*)f;
Byte* q=p+sizeof(double)-1;
Byte t;
t=*p; *p++=*q; *q--=t;
t=*p; *p++=*q; *q--=t;
t=*p; *p++=*q; *q--=t;
t=*p; *p++=*q; *q--=t;
}
static real LoadNumber(Sundump* S)
{
if (S->LoadFloat)
{
float f;
ezread(S->Z,&f,sizeof(f));
if (S->SwapNumber) SwapFloat(&f);
return f;
}
else
{
double f;
ezread(S->Z,&f,sizeof(f));
if (S->SwapNumber) SwapDouble(&f);
return f;
}
}
static void LoadLocals(TProtoFunc* tf, ZIO* Z)
{
int i,n=LoadWord(Z);
if (n==0) return;
tf->locvars=luaM_newvector(n+1,LocVar);
for (i=0; i<n; i++)
{
tf->locvars[i].line=LoadWord(Z);
tf->locvars[i].varname=LoadTString(Z);
}
tf->locvars[i].line=-1; /* flag end of vector */
tf->locvars[i].varname=NULL;
}
static void LoadConstants(TProtoFunc* tf, Sundump* S)
{
int i,n=LoadWord(S->Z);
tf->nconsts=n;
if (n==0) return;
tf->consts=luaM_newvector(n,TObject);
for (i=0; i<n; i++)
{
TObject* o=tf->consts+i;
int c=ezgetc(S->Z);
switch (c)
{
case ID_NUM:
ttype(o)=LUA_T_NUMBER;
nvalue(o)=LoadNumber(S);
break;
case ID_STR:
ttype(o)=LUA_T_STRING;
tsvalue(o)=LoadTString(S->Z);
break;
case ID_FUN:
ttype(o)=LUA_T_PROTO;
tfvalue(o)=NULL;
break;
#ifdef DEBUG
default: /* cannot happen */
luaL_verror("internal error in LoadConstants: "
"bad constant #%d type=%d ('%c')\n",i,c,c);
break;
#endif
}
}
}
static TProtoFunc* LoadFunction(Sundump* S);
static void LoadFunctions(TProtoFunc* tf, Sundump* S)
{
while (zgetc(S->Z)==ID_FUNCTION)
{
int i=LoadWord(S->Z);
TProtoFunc* t=LoadFunction(S);
TObject* o=tf->consts+i;
tfvalue(o)=t;
}
}
static TProtoFunc* LoadFunction(Sundump* S)
{
ZIO* Z=S->Z;
TProtoFunc* tf=luaF_newproto();
tf->lineDefined=LoadWord(Z);
tf->fileName=LoadTString(Z);
tf->code=LoadBlock(LoadSize(Z),Z);
LoadConstants(tf,S);
LoadLocals(tf,Z);
LoadFunctions(tf,S);
return tf;
}
static void LoadSignature(ZIO* Z)
{
char* s=SIGNATURE;
while (*s!=0 && ezgetc(Z)==*s)
++s;
if (*s!=0) luaL_verror("bad signature in binary file %s",Z->name);
}
static void LoadHeader(Sundump* S)
{
ZIO* Z=S->Z;
int version,sizeofR;
LoadSignature(Z);
version=ezgetc(Z);
if (version>VERSION)
luaL_verror(
"binary file %s too new: version=0x%02x; expected at most 0x%02x",
Z->name,version,VERSION);
if (version<0x31) /* major change in 3.1 */
luaL_verror(
"binary file %s too old: version=0x%02x; expected at least 0x%02x",
Z->name,version,0x31);
sizeofR=ezgetc(Z); /* test float representation */
if (sizeofR==sizeof(float))
{
float f,tf=TEST_FLOAT;
ezread(Z,&f,sizeof(f));
if (f!=tf)
{
SwapFloat(&f);
if (f!=tf)
luaL_verror("unknown float representation in binary file %s",Z->name);
S->SwapNumber=1;
}
S->LoadFloat=1;
}
else if (sizeofR==sizeof(double))
{
double f,tf=TEST_FLOAT;
ezread(Z,&f,sizeof(f));
if (f!=tf)
{
SwapDouble(&f);
if (f!=tf)
luaL_verror("unknown float representation in binary file %s",Z->name);
S->SwapNumber=1;
}
S->LoadFloat=0;
}
else
luaL_verror(
"floats in binary file %s have %d bytes; "
"expected %d (float) or %d (double)",
Z->name,sizeofR,sizeof(float),sizeof(double));
}
static TProtoFunc* LoadChunk(Sundump* S)
{
LoadHeader(S);
return LoadFunction(S);
}
/*
** load one chunk from a file or buffer
** return main if ok and NULL at EOF
*/
TProtoFunc* luaU_undump1(ZIO* Z)
{
int c=zgetc(Z);
Sundump S;
S.Z=Z;
S.SwapNumber=0;
S.LoadFloat=1;
if (c==ID_CHUNK)
return LoadChunk(&S);
else if (c!=EOZ)
luaL_verror("%s is not a lua binary file",Z->name);
return NULL;
}
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