sqstdblob.cpp

00001 /* see copyright notice in squirrel.h */
00002 #include <new>
00003 #include <squirrel.h>
00004 #include <sqstdio.h>
00005 #include <string.h>
00006 #include <sqstdblob.h>
00007 #include "sqstdstream.h"
00008 #include "sqstdblobimpl.h"
00009 
00010 #define SQSTD_BLOB_TYPE_TAG (SQSTD_STREAM_TYPE_TAG | 0x00000002)
00011 
00012 //Blob
00013 
00014 
00015 #define SETUP_BLOB(v) \
00016   SQBlob *self = NULL; \
00017   { if(SQ_FAILED(sq_getinstanceup(v,1,(SQUserPointer*)&self,(SQUserPointer)SQSTD_BLOB_TYPE_TAG))) \
00018     return SQ_ERROR; }
00019 
00020 
00021 static SQInteger _blob_resize(HSQUIRRELVM v)
00022 {
00023   SETUP_BLOB(v);
00024   SQInteger size;
00025   sq_getinteger(v,2,&size);
00026   if(!self->Resize(size))
00027     return sq_throwerror(v,_SC("resize failed"));
00028   return 0;
00029 }
00030 
00031 static void __swap_dword(unsigned int *n)
00032 {
00033   *n=(unsigned int)(((*n&0xFF000000)>>24)  |
00034       ((*n&0x00FF0000)>>8)  |
00035       ((*n&0x0000FF00)<<8)  |
00036       ((*n&0x000000FF)<<24));
00037 }
00038 
00039 static void __swap_word(unsigned short *n)
00040 {
00041   *n=(unsigned short)((*n>>8)&0x00FF)| ((*n<<8)&0xFF00);
00042 }
00043 
00044 static SQInteger _blob_swap4(HSQUIRRELVM v)
00045 {
00046   SETUP_BLOB(v);
00047   SQInteger num=(self->Len()-(self->Len()%4))>>2;
00048   unsigned int *t=(unsigned int *)self->GetBuf();
00049   for(SQInteger i = 0; i < num; i++) {
00050     __swap_dword(&t[i]);
00051   }
00052   return 0;
00053 }
00054 
00055 static SQInteger _blob_swap2(HSQUIRRELVM v)
00056 {
00057   SETUP_BLOB(v);
00058   SQInteger num=(self->Len()-(self->Len()%2))>>1;
00059   unsigned short *t = (unsigned short *)self->GetBuf();
00060   for(SQInteger i = 0; i < num; i++) {
00061     __swap_word(&t[i]);
00062   }
00063   return 0;
00064 }
00065 
00066 static SQInteger _blob__set(HSQUIRRELVM v)
00067 {
00068   SETUP_BLOB(v);
00069   SQInteger idx,val;
00070   sq_getinteger(v,2,&idx);
00071   sq_getinteger(v,3,&val);
00072   if(idx < 0 || idx >= self->Len())
00073     return sq_throwerror(v,_SC("index out of range"));
00074   ((unsigned char *)self->GetBuf())[idx] = (unsigned char) val;
00075   sq_push(v,3);
00076   return 1;
00077 }
00078 
00079 static SQInteger _blob__get(HSQUIRRELVM v)
00080 {
00081   SETUP_BLOB(v);
00082   SQInteger idx;
00083   sq_getinteger(v,2,&idx);
00084   if(idx < 0 || idx >= self->Len())
00085     return sq_throwerror(v,_SC("index out of range"));
00086   sq_pushinteger(v,((unsigned char *)self->GetBuf())[idx]);
00087   return 1;
00088 }
00089 
00090 static SQInteger _blob__nexti(HSQUIRRELVM v)
00091 {
00092   SETUP_BLOB(v);
00093   if(sq_gettype(v,2) == OT_NULL) {
00094     sq_pushinteger(v, 0);
00095     return 1;
00096   }
00097   SQInteger idx;
00098   if(SQ_SUCCEEDED(sq_getinteger(v, 2, &idx))) {
00099     if(idx+1 < self->Len()) {
00100       sq_pushinteger(v, idx+1);
00101       return 1;
00102     }
00103     sq_pushnull(v);
00104     return 1;
00105   }
00106   return sq_throwerror(v,_SC("internal error (_nexti) wrong argument type"));
00107 }
00108 
00109 static SQInteger _blob__typeof(HSQUIRRELVM v)
00110 {
00111   sq_pushstring(v,_SC("blob"),-1);
00112   return 1;
00113 }
00114 
00115 static SQInteger _blob_releasehook(SQUserPointer p, SQInteger size)
00116 {
00117   SQBlob *self = (SQBlob*)p;
00118   delete self;
00119   return 1;
00120 }
00121 
00122 static SQInteger _blob_constructor(HSQUIRRELVM v)
00123 {
00124   SQInteger nparam = sq_gettop(v);
00125   SQInteger size = 0;
00126   if(nparam == 2) {
00127     sq_getinteger(v, 2, &size);
00128   }
00129   if(size < 0) return sq_throwerror(v, _SC("cannot create blob with negative size"));
00130   SQBlob *b = new SQBlob(size);
00131   if(SQ_FAILED(sq_setinstanceup(v,1,b))) {
00132     delete b;
00133     return sq_throwerror(v, _SC("cannot create blob with negative size"));
00134   }
00135   sq_setreleasehook(v,1,_blob_releasehook);
00136   return 0;
00137 }
00138 
00139 #define _DECL_BLOB_FUNC(name,nparams,typecheck) {_SC(#name),_blob_##name,nparams,typecheck}
00140 static SQRegFunction _blob_methods[] = {
00141   _DECL_BLOB_FUNC(constructor,-1,_SC("xn")),
00142   _DECL_BLOB_FUNC(resize,2,_SC("xn")),
00143   _DECL_BLOB_FUNC(swap2,1,_SC("x")),
00144   _DECL_BLOB_FUNC(swap4,1,_SC("x")),
00145   _DECL_BLOB_FUNC(_set,3,_SC("xnn")),
00146   _DECL_BLOB_FUNC(_get,2,_SC("xn")),
00147   _DECL_BLOB_FUNC(_typeof,1,_SC("x")),
00148   _DECL_BLOB_FUNC(_nexti,2,_SC("x")),
00149   {0,0,0,0}
00150 };
00151 
00152 
00153 
00154 //GLOBAL FUNCTIONS
00155 
00156 static SQInteger _g_blob_casti2f(HSQUIRRELVM v)
00157 {
00158   SQInteger i;
00159   sq_getinteger(v,2,&i);
00160   sq_pushfloat(v,*((SQFloat *)&i));
00161   return 1;
00162 }
00163 
00164 static SQInteger _g_blob_castf2i(HSQUIRRELVM v)
00165 {
00166   SQFloat f;
00167   sq_getfloat(v,2,&f);
00168   sq_pushinteger(v,*((SQInteger *)&f));
00169   return 1;
00170 }
00171 
00172 static SQInteger _g_blob_swap2(HSQUIRRELVM v)
00173 {
00174   SQInteger i;
00175   sq_getinteger(v,2,&i);
00176   short s=(short)i;
00177   sq_pushinteger(v,(s<<8)|((s>>8)&0x00FF));
00178   return 1;
00179 }
00180 
00181 static SQInteger _g_blob_swap4(HSQUIRRELVM v)
00182 {
00183   SQInteger i;
00184   sq_getinteger(v,2,&i);
00185   unsigned int t4 = (unsigned int)i;
00186   __swap_dword(&t4);
00187   sq_pushinteger(v,(SQInteger)t4);
00188   return 1;
00189 }
00190 
00191 static SQInteger _g_blob_swapfloat(HSQUIRRELVM v)
00192 {
00193   SQFloat f;
00194   sq_getfloat(v,2,&f);
00195   __swap_dword((unsigned int *)&f);
00196   sq_pushfloat(v,f);
00197   return 1;
00198 }
00199 
00200 #define _DECL_GLOBALBLOB_FUNC(name,nparams,typecheck) {_SC(#name),_g_blob_##name,nparams,typecheck}
00201 static SQRegFunction bloblib_funcs[]={
00202   _DECL_GLOBALBLOB_FUNC(casti2f,2,_SC(".n")),
00203   _DECL_GLOBALBLOB_FUNC(castf2i,2,_SC(".n")),
00204   _DECL_GLOBALBLOB_FUNC(swap2,2,_SC(".n")),
00205   _DECL_GLOBALBLOB_FUNC(swap4,2,_SC(".n")),
00206   _DECL_GLOBALBLOB_FUNC(swapfloat,2,_SC(".n")),
00207   {0,0,0,0}
00208 };
00209 
00210 SQRESULT sqstd_getblob(HSQUIRRELVM v,SQInteger idx,SQUserPointer *ptr)
00211 {
00212   SQBlob *blob;
00213   if(SQ_FAILED(sq_getinstanceup(v,idx,(SQUserPointer *)&blob,(SQUserPointer)SQSTD_BLOB_TYPE_TAG)))
00214     return -1;
00215   *ptr = blob->GetBuf();
00216   return SQ_OK;
00217 }
00218 
00219 SQInteger sqstd_getblobsize(HSQUIRRELVM v,SQInteger idx)
00220 {
00221   SQBlob *blob;
00222   if(SQ_FAILED(sq_getinstanceup(v,idx,(SQUserPointer *)&blob,(SQUserPointer)SQSTD_BLOB_TYPE_TAG)))
00223     return -1;
00224   return blob->Len();
00225 }
00226 
00227 SQUserPointer sqstd_createblob(HSQUIRRELVM v, SQInteger size)
00228 {
00229   SQInteger top = sq_gettop(v);
00230   sq_pushregistrytable(v);
00231   sq_pushstring(v,_SC("std_blob"),-1);
00232   if(SQ_SUCCEEDED(sq_get(v,-2))) {
00233     sq_remove(v,-2); //removes the registry
00234     sq_push(v,1); // push the this
00235     sq_pushinteger(v,size); //size
00236     SQBlob *blob = NULL;
00237     if(SQ_SUCCEEDED(sq_call(v,2,SQTrue,SQFalse))
00238       && SQ_SUCCEEDED(sq_getinstanceup(v,-1,(SQUserPointer *)&blob,(SQUserPointer)SQSTD_BLOB_TYPE_TAG))) {
00239       sq_remove(v,-2);
00240       return blob->GetBuf();
00241     }
00242   }
00243   sq_settop(v,top);
00244   return NULL;
00245 }
00246 
00247 SQRESULT sqstd_register_bloblib(HSQUIRRELVM v)
00248 {
00249   return declare_stream(v,_SC("blob"),(SQUserPointer)SQSTD_BLOB_TYPE_TAG,_SC("std_blob"),_blob_methods,bloblib_funcs);
00250 }
00251 

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