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/*
** $Id: lundump.c,v 1.10 1998/06/25 15:50:09 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"
#define LoadBlock(b,size,Z) ezread(Z,b,size)
#define LoadNative(t,Z) LoadBlock(&t,sizeof(t),Z)
#if ID_NUMBER==ID_NATIVE
#define doLoadNumber(f,Z) LoadNative(f,Z)
#else
#define doLoadNumber(f,Z) f=LoadNumber(Z)
#endif
static void unexpectedEOZ(ZIO* Z)
{
luaL_verror("unexpected end of file in %s",zname(Z));
}
static int ezgetc(ZIO* Z)
{
int c=zgetc(Z);
if (c==EOZ) unexpectedEOZ(Z);
return c;
}
static void ezread(ZIO* Z, void* b, int n)
{
int r=zread(Z,b,n);
if (r!=0) unexpectedEOZ(Z);
}
static unsigned int LoadWord(ZIO* Z)
{
unsigned int hi=ezgetc(Z);
unsigned int lo=ezgetc(Z);
return (hi<<8)|lo;
}
static unsigned long LoadLong(ZIO* Z)
{
unsigned long hi=LoadWord(Z);
unsigned long lo=LoadWord(Z);
return (hi<<16)|lo;
}
#if ID_NUMBER==ID_REAL4
/* LUA_NUMBER */
/* assumes sizeof(long)==4 and sizeof(float)==4 (IEEE) */
static float LoadFloat(ZIO* Z)
{
unsigned long l=LoadLong(Z);
float f=*(float*)&l;
return f;
}
#endif
#if ID_NUMBER==ID_REAL8
/* LUA_NUMBER */
/* assumes sizeof(long)==4 and sizeof(double)==8 (IEEE) */
static double LoadDouble(ZIO* Z)
{
unsigned long l[2];
double f;
int x=1;
if (*(char*)&x==1) /* little-endian */
{
l[1]=LoadLong(Z);
l[0]=LoadLong(Z);
}
else /* big-endian */
{
l[0]=LoadLong(Z);
l[1]=LoadLong(Z);
}
f=*(double*)l;
return f;
}
#endif
static Byte* LoadCode(ZIO* Z)
{
unsigned long size=LoadLong(Z);
unsigned int s=size;
void* b;
if (s!=size) luaL_verror("code too long (%ld bytes) in %s",size,zname(Z));
b=luaM_malloc(size);
LoadBlock(b,size,Z);
return b;
}
static TaggedString* LoadTString(ZIO* Z)
{
int size=LoadWord(Z);
if (size==0)
return NULL;
else
{
char* s=luaL_openspace(size);
LoadBlock(s,size,Z);
return luaS_newlstr(s,size-1);
}
}
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 TProtoFunc* LoadFunction(ZIO* Z);
static void LoadConstants(TProtoFunc* tf, ZIO* Z)
{
int i,n=LoadWord(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(Z);
switch (c)
{
case ID_NUM:
ttype(o)=LUA_T_NUMBER;
doLoadNumber(nvalue(o),Z);
break;
case ID_STR:
ttype(o)=LUA_T_STRING;
tsvalue(o)=LoadTString(Z);
break;
case ID_FUN:
ttype(o)=LUA_T_PROTO;
tfvalue(o)=LoadFunction(Z);
break;
default:
luaL_verror("bad constant #%d in %s: type=%d ('%c')",i,zname(Z),c,c);
break;
}
}
}
static TProtoFunc* LoadFunction(ZIO* Z)
{
TProtoFunc* tf=luaF_newproto();
tf->lineDefined=LoadWord(Z);
tf->fileName=LoadTString(Z);
tf->code=LoadCode(Z);
LoadLocals(tf,Z);
LoadConstants(tf,Z);
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 %s",zname(Z));
}
static void LoadHeader(ZIO* Z)
{
int version,id,sizeofR;
real f=-TEST_NUMBER,tf=TEST_NUMBER;
LoadSignature(Z);
version=ezgetc(Z);
if (version>VERSION)
luaL_verror(
"%s too new: version=0x%02x; expected at most 0x%02x",
zname(Z),version,VERSION);
if (version<VERSION0) /* check last major change */
luaL_verror(
"%s too old: version=0x%02x; expected at least 0x%02x",
zname(Z),version,VERSION0);
id=ezgetc(Z); /* test number representation */
sizeofR=ezgetc(Z);
if (id!=ID_NUMBER || sizeofR!=sizeof(real))
{
luaL_verror("unknown number signature in %s: "
"read 0x%02x%02x; expected 0x%02x%02x",
zname(Z),id,sizeofR,ID_NUMBER,sizeof(real));
}
doLoadNumber(f,Z);
if (f!=tf)
luaL_verror("unknown number representation in %s: "
"read " NUMBER_FMT "; expected " NUMBER_FMT "", /* LUA_NUMBER */
zname(Z),(double)f,(double)tf);
}
static TProtoFunc* LoadChunk(ZIO* Z)
{
LoadHeader(Z);
return LoadFunction(Z);
}
/*
** 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);
if (c==ID_CHUNK)
return LoadChunk(Z);
else if (c!=EOZ)
luaL_verror("%s is not a Lua binary file",zname(Z));
return NULL;
}
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