1 files changed, 77 insertions, 0 deletions
diff --git a/comm/mail/components/about-support/AboutSupportWin32.jsm b/comm/mail/components/about-support/AboutSupportWin32.jsm
new file mode 100644
index 0000000000..4c5e36c5bd
--- /dev/null
+++ b/comm/mail/components/about-support/AboutSupportWin32.jsm
@@ -0,0 +1,77 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+var EXPORTED_SYMBOLS = ["AboutSupportPlatform"];
+
+// JS ctypes are needed to get at the data we need
+var { ctypes } = ChromeUtils.importESModule(
+  "resource://gre/modules/ctypes.sys.mjs"
+);
+
+var BOOL = ctypes.int32_t;
+var DRIVE_UNKNOWN = 0;
+var DRIVE_NETWORK = 4;
+
+var AboutSupportPlatform = {
+  /**
+   * Given an nsIFile, gets the file system type. The type is returned as a
+   * string. Possible values are "network", "local", "unknown" and null.
+   */
+  getFileSystemType(aFile) {
+    let kernel32 = ctypes.open("kernel32.dll");
+
+    try {
+      // Returns the path of the volume a file is on.
+      let GetVolumePathName = kernel32.declare(
+        "GetVolumePathNameW",
+        ctypes.winapi_abi,
+        BOOL, // return type: 1 indicates success, 0 failure
+        ctypes.char16_t.ptr, // in: lpszFileName
+        ctypes.char16_t.ptr, // out: lpszVolumePathName
+        ctypes.uint32_t // in: cchBufferLength
+      );
+
+      // Returns the last error.
+      let GetLastError = kernel32.declare(
+        "GetLastError",
+        ctypes.winapi_abi,
+        ctypes.uint32_t // return type: the last error
+      );
+
+      let filePath = aFile.path;
+      // The volume path should be at most 1 greater than than the length of the
+      // path -- add 1 for a trailing backslash if necessary, and 1 for the
+      // terminating null character. Note that the parentheses around the type are
+      // necessary for new to apply correctly.
+      let volumePath = new (ctypes.char16_t.array(filePath.length + 2))();
+
+      if (!GetVolumePathName(filePath, volumePath, volumePath.length)) {
+        throw new Error(
+          "Unable to get volume path for " +
+            filePath +
+            ", error " +
+            GetLastError()
+        );
+      }
+
+      // Returns the type of the drive.
+      let GetDriveType = kernel32.declare(
+        "GetDriveTypeW",
+        ctypes.winapi_abi,
+        ctypes.uint32_t, // return type: the drive type
+        ctypes.char16_t.ptr // in: lpRootPathName
+      );
+      let type = GetDriveType(volumePath);
+      // http://msdn.microsoft.com/en-us/library/aa364939
+      if (type == DRIVE_UNKNOWN) {
+        return "unknown";
+      } else if (type == DRIVE_NETWORK) {
+        return "network";
+      }
+      return "local";
+    } finally {
+      kernel32.close();
+    }
+  },
+};