[iso] work around ISOs that use broken symbolic links for UEFI bootloaders

* Per linuxmint/linuxmint#622 some ISOs may have a /EFI/boot/bootx64.efi that
  is a symbolic to a nonexisting file.
* This is originally due to a Debian bug that was fixed in:
  5bff71fea2
* Work around this by trying to extract a working bootx64.efi from the El-Torito image.
* Also improve DumpFatDir() to not replace already existing files.

src/iso.c

@@ -1,7 +1,7 @@
 /*
  * Rufus: The Reliable USB Formatting Utility
  * ISO file extraction
- * Copyright © 2011-2023 Pete Batard <pete@akeo.ie>
+ * Copyright © 2011-2024 Pete Batard <pete@akeo.ie>
  * Based on libcdio's iso & udf samples:
  * Copyright © 2003-2014 Rocky Bernstein <rocky@gnu.org>
  *
@@ -292,6 +292,16 @@ static BOOL check_iso_props(const char* psz_dirname, int64_t file_length, const
 					}
 				}
 			}
+			// Linux Mint Edge 21.2/Mint 21.3 have an invalid /EFI/boot/bootx64.efi
+			// because it's a symbolic link to a file that does not exist on the media.
+			// This is originally due to a Debian bug that was fixed in:
+			// https://salsa.debian.org/live-team/live-build/-/commit/5bff71fea2dd54adcd6c428d3f1981734079a2f7
+			// Because of this, if we detect a small bootx64.efi file, we assert that it's a
+			// broken link and try to extract a "good" version from the El-Torito image.
+			if ((safe_stricmp(psz_basename, efi_bootname[2]) == 0) && (file_length < 100)) {
+				img_report.has_efi |= 0x4000;
+				static_strcpy(img_report.efi_img_path, "[BOOT]/1-Boot-NoEmul.img");
+			}
 		}
 
 		if (psz_dirname != NULL) {
@@ -1277,8 +1287,16 @@ out:
 		SendMessage(hMainDialog, UM_PROGRESS_EXIT, 0, 0);
 	} else {
 		// Solus and other ISOs only provide EFI boot files in a FAT efi.img
-		if (img_report.has_efi == 0x8000)
+		// Also work around ISOs that have a borked symbolic link for bootx64.efi.
+		// See https://github.com/linuxmint/linuxmint/issues/622.
+		if (img_report.has_efi & 0xc000) {
+			if (img_report.has_efi & 0x4000) {
+				uprintf("Broken UEFI bootloader detected - Applying workaround:");
+				static_sprintf(path, "%s\\EFI\\boot\\bootx64.efi", dest_dir);
+				DeleteFileU(path);
+			}
 			DumpFatDir(dest_dir, 0);
+		}
 		if (HAS_SYSLINUX(img_report)) {
 			static_sprintf(path, "%s\\syslinux.cfg", dest_dir);
 			// Create a /syslinux.cfg (if none exists) that points to the existing isolinux cfg
@@ -1463,6 +1481,8 @@ try_iso:
 
 out:
 	safe_closehandle(file_handle);
+	if (r == 0)
+		DeleteFileU(dest_file);
 	iso9660_stat_free(p_statbuf);
 	udf_dirent_free(p_udf_root);
 	udf_dirent_free(p_udf_file);
@@ -1727,7 +1747,7 @@ BOOL DumpFatDir(const char* path, int32_t cluster)
 				}
 				if (!DumpFatDir(target, dirpos.cluster))
 					goto out;
-			} else {
+			} else if (!PathFileExistsU(target)) {
 				// Need to figure out if it's a .conf file (Damn you Solus!!)
 				EXTRACT_PROPS props = { 0 };
 				size_t len = strlen(name);

src/rufus.h

@@ -1,6 +1,6 @@
 /*
  * Rufus: The Reliable USB Formatting Utility
- * Copyright © 2011-2023 Pete Batard <pete@akeo.ie>
+ * Copyright © 2011-2024 Pete Batard <pete@akeo.ie>
  *
  * 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

src/rufus.rc

@@ -33,7 +33,7 @@ LANGUAGE LANG_NEUTRAL, SUBLANG_NEUTRAL
 IDD_DIALOG DIALOGEX 12, 12, 232, 326
 STYLE DS_SETFONT | DS_MODALFRAME | DS_CENTER | WS_MINIMIZEBOX | WS_POPUP | WS_CAPTION | WS_SYSMENU
 EXSTYLE WS_EX_ACCEPTFILES
-CAPTION "Rufus 4.4.2100"
+CAPTION "Rufus 4.4.2101"
 FONT 9, "Segoe UI Symbol", 400, 0, 0x0
 BEGIN
     LTEXT           "Drive Properties",IDS_DRIVE_PROPERTIES_TXT,8,6,53,12,NOT WS_GROUP
@@ -392,8 +392,8 @@ END
 //
 
 VS_VERSION_INFO VERSIONINFO
- FILEVERSION 4,4,2100,0
+ FILEVERSION 4,4,2101,0
- PRODUCTVERSION 4,4,2100,0
+ PRODUCTVERSION 4,4,2101,0
  FILEFLAGSMASK 0x3fL
 #ifdef _DEBUG
  FILEFLAGS 0x1L
@@ -411,13 +411,13 @@ BEGIN
             VALUE "Comments", "https://rufus.ie"
             VALUE "CompanyName", "Akeo Consulting"
             VALUE "FileDescription", "Rufus"
-            VALUE "FileVersion", "4.4.2100"
+            VALUE "FileVersion", "4.4.2101"
             VALUE "InternalName", "Rufus"
             VALUE "LegalCopyright", "© 2011-2024 Pete Batard (GPL v3)"
             VALUE "LegalTrademarks", "https://www.gnu.org/licenses/gpl-3.0.html"
             VALUE "OriginalFilename", "rufus-4.4.exe"
             VALUE "ProductName", "Rufus"
-            VALUE "ProductVersion", "4.4.2100"
+            VALUE "ProductVersion", "4.4.2101"
         END
     END
     BLOCK "VarFileInfo"