Implement fs.calculate_file_hashsum

platformio/downloader.py

@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import hashlib
 import io
 import math
 import sys
@@ -23,7 +22,7 @@ from time import mktime
 import click
 import requests
 
-from platformio import app, util
+from platformio import app, fs, util
 from platformio.exception import (
     FDSHASumMismatch,
     FDSizeMismatch,
@@ -103,17 +102,9 @@ class FileDownloader(object):
             raise FDSizeMismatch(_dlsize, self._fname, self.get_size())
         if not sha1:
             return None
-
-        checksum = hashlib.sha1()
-        with io.open(self._destination, "rb", buffering=0) as fp:
-            while True:
-                chunk = fp.read(io.DEFAULT_BUFFER_SIZE)
-                if not chunk:
-                    break
-                checksum.update(chunk)
-
-        if sha1.lower() != checksum.hexdigest().lower():
-            raise FDSHASumMismatch(checksum.hexdigest(), self._fname, sha1)
+        checksum = fs.calculate_file_hashsum("sha1", self._destination)
+        if sha1.lower() != checksum.lower():
+            raise FDSHASumMismatch(checksum, self._fname, sha1)
         return True
 
     def _preserve_filemtime(self, lmdate):

platformio/fs.py

@@ -12,6 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import hashlib
+import io
 import json
 import os
 import re
@@ -72,6 +74,17 @@ def format_filesize(filesize):
     return "%d%sB" % ((base * filesize / unit), suffix)
 
 
+def calculate_file_hashsum(algorithm, path):
+    h = hashlib.new(algorithm)
+    with io.open(path, "rb", buffering=0) as fp:
+        while True:
+            chunk = fp.read(io.DEFAULT_BUFFER_SIZE)
+            if not chunk:
+                break
+            h.update(chunk)
+    return h.hexdigest()
+
+
 def ensure_udev_rules():
     from platformio.util import get_systype  # pylint: disable=import-outside-toplevel