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  1. /*
  2.         This file is part of "Filter Foundry", a filter plugin for Adobe Photoshop
  3.         Copyright (C) 2003-2009 Toby Thain, toby@telegraphics.com.au
  4.         Copyright (C) 2018-2021 Daniel Marschall, ViaThinkSoft
  5.  
  6.         This program is free software; you can redistribute it and/or modify
  7.         it under the terms of the GNU General Public License as published by
  8.         the Free Software Foundation; either version 2 of the License, or
  9.         (at your option) any later version.
  10.  
  11.         This program is distributed in the hope that it will be useful,
  12.         but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14.         GNU General Public License for more details.
  15.  
  16.         You should have received a copy of the GNU General Public License
  17.         along with this program; if not, write to the Free Software
  18.         Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19. */
  20.  
  21. #include "ff.h"
  22.  
  23. #include "file_compat.h"
  24.  
  25. #include <string.h>
  26.  
  27. static UINT16 parm_id;
  28.  
  29. static BOOL CALLBACK enumnames(HMODULE hModule, LPCTSTR lpszType,
  30.         LPTSTR lpszName, LONG_PTR lParam)
  31. {
  32.         if (IS_INTRESOURCE(lpszName)) {
  33.                 parm_id = (UINT16)((intptr_t)lpszName & 0xFFFF);
  34.                 return false; // we only want the first one
  35.         }
  36.         else return true;
  37. }
  38.  
  39. Boolean readPARMresource(HMODULE hm, char** reason, int readobfusc) {
  40.         HRSRC resinfo;
  41.         HANDLE h;
  42.         Ptr pparm;
  43.  
  44.         parm_id = 1;
  45.         EnumResourceNames(hm, PARM_TYPE, enumnames, 0); // callback function enumnames() will find the actual found parm_id
  46.  
  47.         // load first PARM resource
  48.         if ((resinfo = FindResource(hm, MAKEINTRESOURCE(parm_id), PARM_TYPE))) {
  49.                 if ((h = LoadResource(hm, resinfo)) && (pparm = (Ptr)LockResource(h))) {
  50.                         int res = readPARM(&gdata->parm, pparm);
  51.                         gdata->obfusc = false;
  52.                         return res;
  53.                 }
  54.         }
  55.         else if (readobfusc &&
  56.                 ((resinfo = FindResource(hm, OBFUSCDATA_ID_NEW, OBFUSCDATA_TYPE_NEW)) ||
  57.                         (resinfo = FindResource(hm, OBFUSCDATA_ID_OLD, OBFUSCDATA_TYPE_OLD)))) {
  58.                 if ((h = LoadResource(hm, resinfo)) && (pparm = (Ptr)LockResource(h))) {
  59.                         // Fix by DM, 18 Dec 2018:
  60.                         // We need to copy the information, because the resource data is read-only
  61.                         DWORD resSize = SizeofResource(hm, resinfo);
  62.                         if (resSize == sizeof(PARM_T)) {
  63.                                 int res;
  64.                                 PARM_T* copy = (PARM_T*)malloc(resSize);
  65.                                 if (!copy) return false;
  66.                                 memcpy(copy, pparm, resSize);
  67.                                 deobfusc(copy);
  68.                                 res = readPARM(&gdata->parm, (Ptr)copy);
  69.                                 if (!res) {
  70.                                         *reason = _strdup("Incompatible obfuscation.");
  71.                                 }
  72.                                 free(copy);
  73.                                 gdata->obfusc = true;
  74.                                 return res;
  75.                         }
  76.                         else {
  77.                                 // Obfuscationed PARM has wrong size. It is probably a file with different RCDATA
  78.                                 gdata->obfusc = false;
  79.                                 return false;
  80.                         }
  81.                 }
  82.         }
  83.         return false;
  84. }
  85.  
  86. Boolean loadfile(StandardFileReply* sfr, char** reason) {
  87.         HMODULE hm;
  88.  
  89.         // The different read-functions will return true if the resource was successfully loaded,
  90.         // or false otherwise. If *reason is set, then the answer is clearly "No". If the result
  91.         // is just false, it means that the program should continue with the next read-function.
  92.         *reason = NULL;
  93.  
  94.         // First, try to read the file as AFS/PFF/TXT file
  95.         if (*reason == NULL) {
  96.                 if (readfile_afs_pff(sfr, reason)) {
  97.                         gdata->obfusc = false;
  98.                         gdata->parmloaded = false;
  99.                         return true;
  100.                 }
  101.         }
  102.  
  103.         // If that didn't work, try to load as Windows image file (Resource API for 8BF/PRM files)
  104.         if (*reason == NULL) {
  105.                 char name[MAX_PATH + 1];
  106.                 if (hm = LoadLibraryEx(myp2cstrcpy(name, sfr->sfFile.name), NULL, LOAD_LIBRARY_AS_DATAFILE)) {
  107.                         if (readPARMresource(hm, reason, READ_OBFUSC)) {
  108.                                 if (gdata->parm.iProtected) {
  109.                                         *reason = _strdup("The filter is protected.");
  110.                                         //gdata->parmloaded = false;
  111.                                 }
  112.                                 else {
  113.                                         gdata->parmloaded = true;
  114.                                         FreeLibrary(hm);
  115.                                         return true;
  116.                                 }
  117.                         }
  118.                         FreeLibrary(hm);
  119.                 }
  120.         }
  121.  
  122.         // Is it a "Filters Unlimited" filter? (Only partially compatible with Filter Factory!!!)
  123.         if (*reason == NULL) {
  124.                 if (readfile_ffx(sfr, reason)) {
  125.                         gdata->parmloaded = true;
  126.                         return true;
  127.                 }
  128.         }
  129.  
  130.         // Is it a "Filters Unlimited" filter? (Only partially compatible with Filter Factory!!!)
  131.         if (*reason == NULL) {
  132.                 if (readfile_picotxt(sfr, reason)) {
  133.                         gdata->parmloaded = true;
  134.                         return true;
  135.                 }
  136.         }
  137.  
  138.         // If nothing worked, we will try to find a PARM resource (MacOS plugin, or 64 bit 8BF on Win32 OS)
  139.         // Note that we cannot detect obfuscated filters here!
  140.         if (*reason == NULL) {
  141.                 if (readfile_8bf(sfr, reason)) {
  142.                         if (gdata->parm.iProtected) {
  143.                                 // This is for purely protected filters before the time when obfuscation and protection was merged
  144.                                 *reason = _strdup("The filter is protected.");
  145.                         }
  146.                         else {
  147.                                 gdata->parmloaded = true;
  148.                                 return true;
  149.                         }
  150.                 }
  151.         }
  152.  
  153.         // We didn't had success. If we have a clear reason, return false and the reason.
  154.         // If we don't have a clear reason, set a generic reason and return false.
  155.         if (*reason == NULL) {
  156.                 *reason = _strdup("It is not a text parameter file, nor a standalone Mac/PC filter created by Filter Factory/Filter Foundry.");
  157.         }
  158.         return false;
  159. }