[rvthtool] extract: Allow the bank number to be omitted for standalone disc images.

README.md

@@ -76,10 +76,9 @@ extract bank 1.
   * If the game is retail-encrypted, it will be converted to debug encryption
     and signed using the debug keys.
 * Convert an RVT-R disc image to retail fakesigned:
-  * `$ ./rvthtool extract --recrypt=retail RVT-R.gcm 1 RetailFakesigned.gcm`
-  * NOTE: Currently, disc images are treated as if they're single-bank RVT-H
-    HDD images. This is why a bank number is required, even though it will
-    always be 1.
+  * `$ ./rvthtool extract --recrypt=retail RVT-R.gcm RetailFakesigned.gcm`
+  * The bank number may be omitted if the source file is a standalone disc
+    image instead of an RVT-H HDD image or RVT-H Reader device.
 * Query available RVT-H Readers:
 ```
 $ ./rvthtool query

src/rvthtool/extract.c

@@ -74,7 +74,7 @@ static bool progress_callback(const RvtH_Progress_State *state)
 /**
  * 'extract' command.
  * @param rvth_filename	[in] RVT-H device or disk image filename.
- * @param s_bank	[in] Bank number (as a string).
+ * @param s_bank	[in] Bank number (as a string). (If NULL, assumes bank 1.)
  * @param gcm_filename	[in] Filename for the extracted GCM image.
  * @param recrypt_key	[in] Key for recryption. (-1 for default)
  * @return 0 on success; non-zero on error.
@@ -95,14 +95,27 @@ int extract(const TCHAR *rvth_filename, const TCHAR *s_bank, const TCHAR *gcm_fi
 		return ret;
 	}
 
-	// Validate the bank number.
-	bank = (unsigned int)_tcstoul(s_bank, &endptr, 10) - 1;
-	if (*endptr != 0 || bank > rvth_get_BankCount(rvth)) {
-		fputs("*** ERROR: Invalid bank number '", stderr);
-		_fputts(s_bank, stderr);
-		fputs("'.\n", stderr);
-		rvth_close(rvth);
-		return -EINVAL;
+	if (s_bank) {
+		// Validate the bank number.
+		bank = (unsigned int)_tcstoul(s_bank, &endptr, 10) - 1;
+		if (*endptr != 0 || bank > rvth_get_BankCount(rvth)) {
+			fputs("*** ERROR: Invalid bank number '", stderr);
+			_fputts(s_bank, stderr);
+			fputs("'.\n", stderr);
+			rvth_close(rvth);
+			return -EINVAL;
+		}
+	} else {
+		// No bank number specified.
+		// Assume 1 bank if this is a standalone disc image.
+		// For HDD images or RVT-H Readers, this is an error.
+		if (rvth_get_BankCount(rvth) != 1) {
+			fprintf(stderr, "*** ERROR: Must specify a bank number for this RVT-H Reader%s.\n",
+				rvth_is_hdd(rvth) ? "" : " disk image");
+			rvth_close(rvth);
+			return -EINVAL;
+		}
+		bank = 0;
 	}
 
 	// Print the bank information.

src/rvthtool/extract.h

@@ -30,7 +30,7 @@ extern "C" {
 /**
  * 'extract' command.
  * @param rvth_filename	RVT-H device or disk image filename.
- * @param s_bank	Bank number (as a string).
+ * @param s_bank	Bank number (as a string). (If NULL, assumes bank 1.)
  * @param gcm_filename	Filename for the extracted GCM image.
  * @param recrypt_key	[in] Key for recryption. (-1 for default)
  * @return 0 on success; non-zero on error.

src/rvthtool/main.c

@@ -222,11 +222,19 @@ int RVTH_CDECL _tmain(int argc, TCHAR *argv[])
 		ret = list_banks(argv[optind+1]);
 	} else if (!_tcscmp(argv[optind], _T("extract"))) {
 		// Extract a bank.
-		if (argc < optind+4) {
+		if (argc < optind+3) {
 			print_error(argv[0], _T("missing parameters for 'extract'"));
 			return EXIT_FAILURE;
+		} else if (argc == optind+3) {
+			// Two parameters specified.
+			// Pass NULL as the bank number, which will be
+			// interpreted as bank 1 for single-disc images
+			// and an error for HDD images.
+			ret = extract(argv[optind+1], NULL, argv[optind+2], recrypt_key);
+		} else {
+			// Three or more parameters specified.
+			ret = extract(argv[optind+1], argv[optind+2], argv[optind+3], recrypt_key);
 		}
-		ret = extract(argv[optind+1], argv[optind+2], argv[optind+3], recrypt_key);
 	} else if (!_tcscmp(argv[optind], _T("import"))) {
 		// Import a bank.
 		if (argc < optind+4) {