WebSVN – filter_foundry – Diff – /trunk/make.c

 /*
     This file is part of "Filter Foundry", a filter plugin for Adobe Photoshop
     Copyright (C) 2003-5 Toby Thain, toby@telegraphics.com.au
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 2 of the License, or
     (at your option) any later version.
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software
     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
 #include <stddef.h>
 long event_id;
 /*
 Find a printable 4-character key, remembering (see PS API guide):
 All IDÕs starting with an uppercase letter are reserved by Adobe.
 All IDÕs that are all uppercase are reserved by Apple.
 All IDÕs that are all lowercase are reserved by Apple.
 This leaves all IDÕs that begin with a lowercase letter and have at least
 one uppercase letter for you and other plug-in developers.
 */
         p = (char*)pipl + origsize;
         prop = (PIProperty*)p;
         /* add Title/Name property key */
         prop->vendorID = kPhotoshopSignature;
         prop->propertyKey = PINameProperty;
         prop->propertyID = 0;
         prop->propertyLength = title[0]+1;
         PLstrcpy((StringPtr)prop->propertyData,title);
         // skip past new property record, and any padding
         p += (offsetof(PIProperty,propertyData) + prop->propertyLength + 3) & -4;
         prop = (PIProperty*)p;
         /* add Category property key */
         prop->vendorID = kPhotoshopSignature;
         prop->propertyKey = PICategoryProperty;
         prop->propertyID = 0;
         prop->propertyLength = gdata->parm.category[0]+1;
         PLstrcpy((StringPtr)prop->propertyData,gdata->parm.category);
         p += (offsetof(PIProperty,propertyData) + prop->propertyLength + 3) & -4;
         prop = (PIProperty*)p;
         /* add HasTerminology property key */
         /* construct scope string by concatenating Category and Title - hopefully unique! */
         hstm = (struct hstm_data*)prop->propertyData;
         scopelen = sprintf(hstm->scope,"%s %s",
                                            INPLACEP2CSTR(gdata->parm.category),
         prop->propertyLength = offsetof(struct hstm_data,scope) + scopelen + 1;
         hstm->version = 0;
         hstm->class_id = plugInClassID;
         hstm->event_id = event_id;
         hstm->aete_resid = AETE_ID;
         p += (16+prop->propertyLength+3) & -4;
         return p - (char*)pipl;  // figure how many bytes were added
+}
 #define SKIP_PSTR(j) (j += 1+aete[j])
 long fixaete(unsigned char *aete,long origsize,StringPtr title){
         int offset,oldlen,newlen,desclen,oldpad,newpad;
         Str255 desc;
         offset = 8; /* point at suite name */
         SKIP_PSTR(offset); /* skip suite name (vendor) [maybe this should become author??] */
         SKIP_PSTR(offset); /* skip suite description [set this from dialog field??] */
         ALIGNWORD(offset);
         newpad = (newlen + desclen) & 1;
 #else
         oldpad = newpad = 0;
 #endif
         /* shift latter part of aete data, taking into account new string lengths */
         memcpy(aete+offset+1+newlen+newpad,
                    aete+offset+1+oldlen+oldpad,
                    origsize-offset-1-oldlen-oldpad); /* phew! */
         /* copy in new title string */
         PLstrcpy((StringPtr)(aete+offset),title);
         /* copy description string into right place... [this could be new description from dialog field??] */
         PLstrcpy((StringPtr)(aete+offset+1+newlen),desc);
         SKIP_PSTR(offset); /* skip (new) event name */
         SKIP_PSTR(offset); /* skip event description */
         ALIGNWORD(offset);
         /* set event ID */
         *(unsigned long*)(aete+offset+4) = event_id; /* FIXME: this might be unaligned access on some platforms?? */
         return origsize-oldlen-oldpad+newlen+newpad;
+}
 void obfusc(unsigned char *pparm,size_t size){
         int i;
         unsigned char *p;
+        /* Do a small self-test to test if the stdlib implementation works as expected, i.e. that it only
+         * depends on the seed set by srand() and on nothing else.
+         */
+        srand(0xdc43df3c);
+        int selftest1 = rand();
+        int selftest2 = rand();
+        int selftest3 = rand();
+        srand(0xdc43df3c);
+        if ((rand() != selftest1) || (rand() != selftest2) || (rand() != selftest3)) {
+                // This should never happen
+                simplealert("Stdcall rand() implementation does not work as expected. Obfuscation operation will be cancelled.");
+                return; // apply no obfuscation
+        }
         /* Very simplistic. meant to hide from casual observation/loading only.
          * Results are platform dependent, but this should not matter. */
         srand(0xdc43df3c);
         for(i = size, p = pparm; i--;)
                 *p++ ^= rand();

Subversion Repositories filter_foundry

filter_foundry/trunk/make.c – Rev 85 → 106