Refactor batch script

zcutil/fetch-params.bat

@@ -4,26 +4,16 @@ cd %THIS_DIR%
 IF NOT EXIST "%APPDATA%"\ZcashParams (
 MKDIR "%APPDATA%"\ZcashParams
 )
-IF NOT EXIST "%APPDATA%"\ZcashParams\sprout-proving.key (
-    ECHO Downloading Zcash trusted setup sprout-proving.key, this may take a while ...
-    .\wget64.exe --progress=dot:giga --continue --retry-connrefused --waitretry=3 --timeout=30 https://z.cash/downloads/sprout-proving.key -O "%APPDATA%"\ZcashParams\sprout-proving.key
-)
-IF NOT EXIST "%APPDATA%"\ZcashParams\sprout-verifying.key (
-    ECHO Downloading Zcash trusted setup sprout-verifying.key, this may take a while ...
-    .\wget64.exe --progress=dot:giga --continue --retry-connrefused --waitretry=3 --timeout=30 https://z.cash/downloads/sprout-verifying.key -O "%APPDATA%"\ZcashParams\sprout-verifying.key
-)
-IF NOT EXIST "%APPDATA%"\ZcashParams\sapling-spend.params (
-    ECHO Downloading Zcash trusted setup sprout-proving.key, this may take a while ...
-    .\wget64.exe --progress=dot:giga --continue --retry-connrefused --waitretry=3 --timeout=30 https://z.cash/downloads/sapling-spend.params -O "%APPDATA%"\ZcashParams\sapling-spend.params
-)
-IF NOT EXIST "%APPDATA%"\ZcashParams\sapling-output.params (
-    ECHO Downloading Zcash trusted setup sprout-verifying.key, this may take a while ...
-    .\wget64.exe --progress=dot:giga --continue --retry-connrefused --waitretry=3 --timeout=30 https://z.cash/downloads/sapling-output.params -O "%APPDATA%"\ZcashParams\sapling-output.params
-)
-IF NOT EXIST "%APPDATA%"\ZcashParams\sprout-groth16.params (
-    ECHO Downloading Zcash trusted setup sprout-verifying.key, this may take a while ...
-    .\wget64.exe --progress=dot:giga --continue --retry-connrefused --waitretry=3 --timeout=30 https://z.cash/downloads/sprout-groth16.params -O "%APPDATA%"\ZcashParams\sprout-groth16.params
+
+FOR %%F IN (sprout-proving.key, sprout-verifying.key, sapling-spend.params, sapling-output.params, sprout-groth16.params) DO (
+    IF NOT EXIST "%APPDATA%"\ZcashParams\%%F  (
+        ECHO Downloading Zcash trusted setup sprout-verifying.key, this may take a while ...
+	        curl --output "%APPDATA%"\ZcashParams \
+            -# -L -C - \
+            https://z.cash/downloads/%%F
+    )
 )
+
 goto :EOF
 :GET_CURRENT_DIR
 pushd %~dp0