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/*
** $Id: lundump.c,v 1.18 2000/03/03 14:58:26 roberto Exp roberto $
** load bytecodes from files
** See Copyright Notice in lua.h
*/
#include <stdio.h>
#include <string.h>
#define LUA_REENTRANT
#include "lauxlib.h"
#include "lfunc.h"
#include "lmem.h"
#include "lopcodes.h"
#include "lstring.h"
#include "lundump.h"
#define LoadBlock(L,b,size,Z) ezread(L,Z,b,size)
static void unexpectedEOZ (lua_State* L, ZIO* Z)
{
luaL_verror(L,"unexpected end of file in %.255s",zname(Z));
}
static int ezgetc (lua_State* L, ZIO* Z)
{
int c=zgetc(Z);
if (c==EOZ) unexpectedEOZ(L,Z);
return c;
}
static void ezread (lua_State* L, ZIO* Z, void* b, int n)
{
int r=zread(Z,b,n);
if (r!=0) unexpectedEOZ(L,Z);
}
static unsigned int LoadWord (lua_State* L, ZIO* Z)
{
unsigned int hi=ezgetc(L,Z);
unsigned int lo=ezgetc(L,Z);
return (hi<<8)|lo;
}
static unsigned long LoadLong (lua_State* L, ZIO* Z)
{
unsigned long hi=LoadWord(L,Z);
unsigned long lo=LoadWord(L,Z);
return (hi<<16)|lo;
}
static Number LoadNumber (lua_State* L, ZIO* Z)
{
char b[256];
int size=ezgetc(L,Z);
LoadBlock(L,b,size,Z);
b[size]=0;
return luaU_str2d(L,b,zname(Z));
}
static int LoadInt (lua_State* L, ZIO* Z, const char* message)
{
unsigned long l=LoadLong(L,Z);
unsigned int i=l;
if (i!=l) luaL_verror(L,message,l,zname(Z));
return i;
}
static void LoadCode (lua_State* L, Proto* tf, ZIO* Z)
{
int size=LoadInt(L,Z,"code too long (%lu bytes) in %.255s");
tf->code=luaM_newvector(L,size,Instruction);
LoadBlock(L,tf->code,size*sizeof(tf->code[0]),Z);
if (tf->code[size-1]!=OP_END) luaL_verror(L,"bad code in %.255s",zname(Z));
}
static TString* LoadString (lua_State* L, ZIO* Z)
{
long size=LoadLong(L,Z);
if (size==0)
return NULL;
else
{
char* s=luaL_openspace(L,size);
LoadBlock(L,s,size,Z);
return luaS_newlstr(L,s,size-1); /* remove trailing '\0' */
}
}
static void LoadLocals (lua_State* L, Proto* tf, ZIO* Z)
{
int i,n=LoadInt(L,Z,"too many locals (%lu) in %.255s");
if (n==0) return;
tf->locvars=luaM_newvector(L,n+1,LocVar);
for (i=0; i<n; i++)
{
tf->locvars[i].line=LoadInt(L,Z,"too many lines (%lu) in %.255s");
tf->locvars[i].varname=LoadString(L,Z);
}
tf->locvars[i].line=-1; /* flag end of vector */
tf->locvars[i].varname=NULL;
}
static Proto* LoadFunction (lua_State* L, ZIO* Z, int native);
static void LoadConstants (lua_State* L, Proto* tf, ZIO* Z, int native)
{
int i,n;
tf->nkstr=n=LoadInt(L,Z,"too many strings (%lu) in %.255s");
if (n>0)
{
tf->kstr=luaM_newvector(L,n,TString*);
for (i=0; i<n; i++) tf->kstr[i]=LoadString(L,Z);
}
tf->nknum=n=LoadInt(L,Z,"too many numbers (%lu) in %.255s");
if (n>0)
{
tf->knum=luaM_newvector(L,n,Number);
if (native)
LoadBlock(L,tf->knum,n*sizeof(tf->knum[0]),Z);
else
for (i=0; i<n; i++) tf->knum[i]=LoadNumber(L,Z);
}
tf->nkproto=n=LoadInt(L,Z,"too many functions (%lu) in %.255s");
if (n>0)
{
tf->kproto=luaM_newvector(L,n,Proto*);
for (i=0; i<n; i++) tf->kproto[i]=LoadFunction(L,Z,native);
}
}
static Proto* LoadFunction (lua_State* L, ZIO* Z, int native)
{
Proto* tf=luaF_newproto(L);
tf->lineDefined=LoadInt(L,Z,"lineDefined too large (%lu) in %.255s");
tf->source=LoadString(L,Z);
if (tf->source==NULL) tf->source=luaS_new(L,zname(Z));
tf->numparams=LoadInt(L,Z,"numparams too large (%lu) in %.255s");
tf->is_vararg=LoadInt(L,Z,"is_vararg too large (%lu) in %.255s");
tf->maxstacksize=LoadInt(L,Z,"maxstacksize too large (%lu) in %.255s");
LoadCode(L,tf,Z);
LoadLocals(L,tf,Z);
LoadConstants(L,tf,Z,native);
return tf;
}
static void LoadSignature (lua_State* L, ZIO* Z)
{
const char* s=SIGNATURE;
while (*s!=0 && ezgetc(L,Z)==*s)
++s;
if (*s!=0) luaL_verror(L,"bad signature in %.255s",zname(Z));
}
#define V(v) v/16,v%16
static int LoadHeader (lua_State* L, ZIO* Z)
{
int version,sizeofR,native;
LoadSignature(L,Z);
version=ezgetc(L,Z);
if (version>VERSION)
luaL_verror(L,
"%.255s too new: its version is %d.%d; expected at most %d.%d",
zname(Z),V(version),V(VERSION));
if (version<VERSION0) /* check last major change */
luaL_verror(L,
"%.255s too old: its version is %d.%d; expected at least %d.%d",
zname(Z),V(version),V(VERSION));
sizeofR=ezgetc(L,Z);
native=(sizeofR!=0);
if (native) /* test number representation */
{
if (sizeofR!=sizeof(Number))
luaL_verror(L,"unknown number size in %.255s: read %d; expected %d",
zname(Z),sizeofR,(int)sizeof(Number));
else
{
Number f=0,tf=TEST_NUMBER;
LoadBlock(L,&f,sizeof(f),Z);
if ((long)f!=(long)tf) /* disregard errors in last bit of fraction */
luaL_verror(L,"unknown number format in %.255s: "
"read " NUMBER_FMT "; expected " NUMBER_FMT,
zname(Z),f,tf);
}
}
return native;
}
static Proto* LoadChunk (lua_State* L, ZIO* Z)
{
return LoadFunction(L,Z,LoadHeader(L,Z));
}
/*
** load one chunk from a file or buffer
** return main if ok and NULL at EOF
*/
Proto* luaU_undump1 (lua_State* L, ZIO* Z)
{
int c=zgetc(Z);
if (c==ID_CHUNK)
return LoadChunk(L,Z);
else if (c!=EOZ)
luaL_verror(L,"%.255s is not a Lua binary file",zname(Z));
return NULL;
}
/*
* convert number from text
*/
double luaU_str2d (lua_State* L, const char* b, const char* where)
{
double x;
if (!luaO_str2d(b,&x))
luaL_verror(L,"cannot convert number '%.255s' in %.255s",b,where);
return x;
}
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