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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.net
  4.         Copyright (C) 2018-2022 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 BOOL CALLBACK enum_find_resname(HMODULE hModule, LPCTSTR lpszType,
  28.         LPTSTR lpszName, LONG_PTR lParam)
  29. {
  30.         UNREFERENCED_PARAMETER(hModule);
  31.         UNREFERENCED_PARAMETER(lpszType);
  32.  
  33.         if (IS_INTRESOURCE(lpszName)) {
  34.                 UINT16* pparm_id = (UINT16*)lParam;
  35.                 *pparm_id = (UINT16)((intptr_t)lpszName & 0xFFFF);
  36.                 return false; // we only want the first one
  37.         }
  38.         else return true;
  39. }
  40.  
  41. Boolean readPARMresource(HMODULE hm, TCHAR** reason) {
  42.         HRSRC resinfo;
  43.         HANDLE h;
  44.         Ptr pparm;
  45.  
  46.         UINT16 parm_id = 1;
  47.         EnumResourceNames(hm, PARM_TYPE, enum_find_resname, (LONG_PTR)&parm_id); // callback function enum_find_resname() will find the actual found parm_id
  48.  
  49.         // load first PARM resource
  50.         if ((resinfo = FindResource(hm, MAKEINTRESOURCE(parm_id), PARM_TYPE))) {
  51.                 if ((h = LoadResource(hm, resinfo)) && (pparm = (Ptr)LockResource(h))) {
  52.                         Boolean res = readPARM(&gdata->parm, pparm);
  53.                         gdata->obfusc = false;
  54.                         return res;
  55.                 }
  56.         }
  57.         else if (
  58.                 ((resinfo = FindResource(hm, OBFUSCDATA_ID_NEW, OBFUSCDATA_TYPE_NEW)) ||
  59.                         (resinfo = FindResource(hm, OBFUSCDATA_ID_OLD, OBFUSCDATA_TYPE_OLD)))) {
  60.                 if ((h = LoadResource(hm, resinfo)) && (pparm = (Ptr)LockResource(h))) {
  61.                         // Fix by DM, 18 Dec 2018:
  62.                         // We need to copy the information, because the resource data is read-only
  63.                         DWORD resSize = SizeofResource(hm, resinfo);
  64.                         if (resSize == sizeof(PARM_T)) {
  65.                                 Boolean res;
  66.                                 PARM_T* copy = (PARM_T*)malloc(resSize);
  67.                                 if (!copy) return false;
  68.                                 memcpy(copy, pparm, resSize);
  69.                                 deobfusc(copy);
  70.                                 res = readPARM(&gdata->parm, (Ptr)copy);
  71.                                 if (!res) {
  72.                                         if (reason) *reason = FF_GetMsg_Cpy(MSG_INCOMPATIBLE_OBFUSCATION_ID);
  73.                                 }
  74.                                 free(copy);
  75.                                 gdata->obfusc = true;
  76.                                 return res;
  77.                         }
  78.                         else {
  79.                                 // Obfuscationed PARM has wrong size. It is probably a file with different RCDATA
  80.                                 gdata->obfusc = false;
  81.                                 return false;
  82.                         }
  83.                 }
  84.         }
  85.         return false;
  86. }
  87.  
  88. Boolean loadfile(StandardFileReply* sfr, TCHAR** reason) {
  89.         HMODULE hm;
  90.         TCHAR* reasonstr;
  91.  
  92.         // The different read-functions will return true if the resource was successfully loaded,
  93.         // or false otherwise. If *reason is set, then the answer is clearly "No". If the result
  94.         // is just false, it means that the program should continue with the next read-function.
  95.         reasonstr = NULL;
  96.  
  97.         // First, try to read the file as AFS/PFF/TXT file
  98.         if (reasonstr == NULL) {
  99.                 if (readfile_afs_pff(sfr, &reasonstr)) {
  100.                         gdata->obfusc = false;
  101.                         gdata->parmloaded = false;
  102.                         return true;
  103.                 }
  104.         }
  105.  
  106.         // Try to read the file as FFL file
  107.         if (reasonstr == NULL) {
  108.                 if (readfile_ffl(sfr, &reasonstr)) {
  109.                         gdata->obfusc = false;
  110.                         gdata->parmloaded = false;
  111.                         return true;
  112.                 }
  113.         }
  114.  
  115.         // If that didn't work, try to load as Windows image file (Resource API for 8BF/PRM files)
  116.         if (reasonstr == NULL) {
  117.                 if (hm = LoadLibraryEx(sfr->sfFile.szName, NULL, LOAD_LIBRARY_AS_DATAFILE)) {
  118.                         if (readPARMresource(hm, &reasonstr)) {
  119.                                 if (gdata->parm.iProtected) {
  120.                                         reasonstr = FF_GetMsg_Cpy(MSG_FILTER_PROTECTED_ID);
  121.                                         //gdata->parmloaded = false;
  122.                                 }
  123.                                 else {
  124.                                         gdata->parmloaded = true;
  125.                                         FreeLibrary(hm);
  126.                                         return true;
  127.                                 }
  128.                         }
  129.                         FreeLibrary(hm);
  130.                 }
  131.         }
  132.  
  133.         // Is it a "Filters Unlimited" FFX filter? (Only partially compatible with Filter Factory!!!)
  134.         if (reasonstr == NULL) {
  135.                 if (readfile_ffx(sfr, &reasonstr)) {
  136.                         gdata->parmloaded = true;
  137.                         return true;
  138.                 }
  139.         }
  140.  
  141.         // Is it a "Filters Unlimited" TXT filter? (Only partially compatible with Filter Factory!!!)
  142.         if (reasonstr == NULL) {
  143.                 if (readfile_picotxt_or_ffdecomp(sfr, &reasonstr)) {
  144.                         gdata->parmloaded = true;
  145.                         return true;
  146.                 }
  147.         }
  148.  
  149.         // Is it a "GIMP UserFilter (GUF)" file? (Only partially compatible with Filter Factory!!!)
  150.         if (reasonstr == NULL) {
  151.                 if (readfile_guf(sfr, &reasonstr)) {
  152.                         gdata->parmloaded = true;
  153.                         return true;
  154.                 }
  155.         }
  156.  
  157.         // If nothing worked, we will try to find a PARM resource (MacOS plugin, or 64 bit 8BF on Win32 OS)
  158.         // Note that we cannot detect obfuscated filters here!
  159.         if (reasonstr == NULL) {
  160.                 if (readfile_8bf(sfr, &reasonstr)) {
  161.                         if (gdata->parm.iProtected) {
  162.                                 // This is for purely protected filters before the time when obfuscation and protection was merged
  163.                                 reasonstr = FF_GetMsg_Cpy(MSG_FILTER_PROTECTED_ID);
  164.                         }
  165.                         else {
  166.                                 gdata->parmloaded = true;
  167.                                 return true;
  168.                         }
  169.                 }
  170.         }
  171.  
  172.         // We didn't had success. If we have a clear reason, return false and the reason.
  173.         // If we don't have a clear reason, set a generic reason and return false.
  174.         if (reasonstr == NULL) {
  175.                 reasonstr = FF_GetMsg_Cpy(MSG_LOADFILE_UNKNOWN_FORMAT_ID);
  176.         }
  177.  
  178.         if (reason) *reason = reasonstr;
  179.  
  180.         return false;
  181. }
  182.