lundump.c
上传用户:yisoukefu
上传日期:2020-08-09
资源大小:39506k
文件大小:4k
- /*
- ** $Id: lundump.c,v 1.60 2006/02/16 15:53:49 lhf Exp $
- ** load precompiled Lua chunks
- ** See Copyright Notice in lua.h
- */
- #include <string.h>
- #define lundump_c
- #define LUA_CORE
- #include "lua.h"
- #include "ldebug.h"
- #include "ldo.h"
- #include "lfunc.h"
- #include "lmem.h"
- #include "lobject.h"
- #include "lstring.h"
- #include "lundump.h"
- #include "lzio.h"
- typedef struct {
- lua_State* L;
- ZIO* Z;
- Mbuffer* b;
- const char* name;
- } LoadState;
- #ifdef LUAC_TRUST_BINARIES
- #define IF(c,s)
- #else
- #define IF(c,s) if (c) error(S,s)
- static void error(LoadState* S, const char* why)
- {
- luaO_pushfstring(S->L,"%s: %s in precompiled chunk",S->name,why);
- luaD_throw(S->L,LUA_ERRSYNTAX);
- }
- #endif
- #define LoadMem(S,b,n,size) LoadBlock(S,b,(n)*(size))
- #define LoadByte(S) (lu_byte)LoadChar(S)
- #define LoadVar(S,x) LoadMem(S,&x,1,sizeof(x))
- #define LoadVector(S,b,n,size) LoadMem(S,b,n,size)
- static void LoadBlock(LoadState* S, void* b, size_t size)
- {
- size_t r=luaZ_read(S->Z,b,size);
- IF (r!=0, "unexpected end");
- }
- static int LoadChar(LoadState* S)
- {
- char x;
- LoadVar(S,x);
- return x;
- }
- static int LoadInt(LoadState* S)
- {
- int x;
- LoadVar(S,x);
- IF (x<0, "bad integer");
- return x;
- }
- static lua_Number LoadNumber(LoadState* S)
- {
- lua_Number x;
- LoadVar(S,x);
- return x;
- }
- static TString* LoadString(LoadState* S)
- {
- size_t size;
- LoadVar(S,size);
- if (size==0)
- return NULL;
- else
- {
- char* s=luaZ_openspace(S->L,S->b,size);
- LoadBlock(S,s,size);
- return luaS_newlstr(S->L,s,size-1); /* remove trailing ' ' */
- }
- }
- static void LoadCode(LoadState* S, Proto* f)
- {
- int n=LoadInt(S);
- f->code=luaM_newvector(S->L,n,Instruction);
- f->sizecode=n;
- LoadVector(S,f->code,n,sizeof(Instruction));
- }
- static Proto* LoadFunction(LoadState* S, TString* p);
- static void LoadConstants(LoadState* S, Proto* f)
- {
- int i,n;
- n=LoadInt(S);
- f->k=luaM_newvector(S->L,n,TValue);
- f->sizek=n;
- for (i=0; i<n; i++) setnilvalue(&f->k[i]);
- for (i=0; i<n; i++)
- {
- TValue* o=&f->k[i];
- int t=LoadChar(S);
- switch (t)
- {
- case LUA_TNIL:
- setnilvalue(o);
- break;
- case LUA_TBOOLEAN:
- setbvalue(o,LoadChar(S));
- break;
- case LUA_TNUMBER:
- setnvalue(o,LoadNumber(S));
- break;
- case LUA_TSTRING:
- setsvalue2n(S->L,o,LoadString(S));
- break;
- default:
- IF (1, "bad constant");
- break;
- }
- }
- n=LoadInt(S);
- f->p=luaM_newvector(S->L,n,Proto*);
- f->sizep=n;
- for (i=0; i<n; i++) f->p[i]=NULL;
- for (i=0; i<n; i++) f->p[i]=LoadFunction(S,f->source);
- }
- static void LoadDebug(LoadState* S, Proto* f)
- {
- int i,n;
- n=LoadInt(S);
- f->lineinfo=luaM_newvector(S->L,n,int);
- f->sizelineinfo=n;
- LoadVector(S,f->lineinfo,n,sizeof(int));
- n=LoadInt(S);
- f->locvars=luaM_newvector(S->L,n,LocVar);
- f->sizelocvars=n;
- for (i=0; i<n; i++) f->locvars[i].varname=NULL;
- for (i=0; i<n; i++)
- {
- f->locvars[i].varname=LoadString(S);
- f->locvars[i].startpc=LoadInt(S);
- f->locvars[i].endpc=LoadInt(S);
- }
- n=LoadInt(S);
- f->upvalues=luaM_newvector(S->L,n,TString*);
- f->sizeupvalues=n;
- for (i=0; i<n; i++) f->upvalues[i]=NULL;
- for (i=0; i<n; i++) f->upvalues[i]=LoadString(S);
- }
- static Proto* LoadFunction(LoadState* S, TString* p)
- {
- Proto* f=luaF_newproto(S->L);
- setptvalue2s(S->L,S->L->top,f); incr_top(S->L);
- f->source=LoadString(S); if (f->source==NULL) f->source=p;
- f->linedefined=LoadInt(S);
- f->lastlinedefined=LoadInt(S);
- f->nups=LoadByte(S);
- f->numparams=LoadByte(S);
- f->is_vararg=LoadByte(S);
- f->maxstacksize=LoadByte(S);
- LoadCode(S,f);
- LoadConstants(S,f);
- LoadDebug(S,f);
- IF (!luaG_checkcode(f), "bad code");
- S->L->top--;
- return f;
- }
- static void LoadHeader(LoadState* S)
- {
- char h[LUAC_HEADERSIZE];
- char s[LUAC_HEADERSIZE];
- luaU_header(h);
- LoadBlock(S,s,LUAC_HEADERSIZE);
- IF (memcmp(h,s,LUAC_HEADERSIZE)!=0, "bad header");
- }
- /*
- ** load precompiled chunk
- */
- Proto* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name)
- {
- LoadState S;
- if (*name=='@' || *name=='=')
- S.name=name+1;
- else if (*name==LUA_SIGNATURE[0])
- S.name="binary string";
- else
- S.name=name;
- S.L=L;
- S.Z=Z;
- S.b=buff;
- LoadHeader(&S);
- return LoadFunction(&S,luaS_newliteral(L,"=?"));
- }
- /*
- * make header
- */
- void luaU_header (char* h)
- {
- int x=1;
- memcpy(h,LUA_SIGNATURE,sizeof(LUA_SIGNATURE)-1);
- h+=sizeof(LUA_SIGNATURE)-1;
- *h++=(char)LUAC_VERSION;
- *h++=(char)LUAC_FORMAT;
- *h++=(char)*(char*)&x; /* endianness */
- *h++=(char)sizeof(int);
- *h++=(char)sizeof(size_t);
- *h++=(char)sizeof(Instruction);
- *h++=(char)sizeof(lua_Number);
- *h++=(char)(((lua_Number)0.5)==0); /* is lua_Number integral? */
- }