bpo-44439: _ZipWriteFile.write() handle buffer protocol correctly (GH-29468)

Co-authored-by: Marco Ribeiro <marcoffee@users.noreply.github.com>

2 files changed, 17 insertions, 1 deletions

diff --git a/Lib/test/test_zipfile.py b/Lib/test/test_zipfile.py
index de2dd33..759a4ab 100644
--- a/Lib/test/test_zipfile.py
+++ b/Lib/test/test_zipfile.py
@@ -1,3 +1,4 @@
+import array
 import contextlib
 import importlib.util
 import io
@@ -1121,6 +1122,14 @@ class AbstractWriterTests:
             self.assertRaises(ValueError, w.write, b'')
             self.assertEqual(zipf.read('test'), data)
 
+    def test_issue44439(self):
+        q = array.array('Q', [1, 2, 3, 4, 5])
+        LENGTH = len(q) * q.itemsize
+        with zipfile.ZipFile(io.BytesIO(), 'w', self.compression) as zip:
+            with zip.open('data', 'w') as data:
+                self.assertEqual(data.write(q), LENGTH)
+            self.assertEqual(zip.getinfo('data').file_size, LENGTH)
+
 class StoredWriterTests(AbstractWriterTests, unittest.TestCase):
     compression = zipfile.ZIP_STORED
 
diff --git a/Lib/zipfile.py b/Lib/zipfile.py
index 8e9325b..41bf49a 100644
--- a/Lib/zipfile.py
+++ b/Lib/zipfile.py
@@ -1147,8 +1147,15 @@ class _ZipWriteFile(io.BufferedIOBase):
     def write(self, data):
         if self.closed:
             raise ValueError('I/O operation on closed file.')
-        nbytes = len(data)
+
+        # Accept any data that supports the buffer protocol
+        if isinstance(data, (bytes, bytearray)):
+            nbytes = len(data)
+        else:
+            data = memoryview(data)
+            nbytes = data.nbytes
         self._file_size += nbytes
+
         self._crc = crc32(data, self._crc)
         if self._compressor:
             data = self._compressor.compress(data)