1 files changed, 16 insertions, 10 deletions

diff --git a/src/common/windows/http_upload.cc b/src/common/windows/http_upload.cc
index aabb9a46..838185b7 100644
--- a/src/common/windows/http_upload.cc
+++ b/src/common/windows/http_upload.cc
@@ -30,7 +30,7 @@
 #include <assert.h>
 
 // Disable exception handler warnings.
-#pragma warning( disable : 4530 )
+#pragma warning(disable:4530)
 
 #include <fstream>
 
@@ -163,7 +163,7 @@ bool HTTPUpload::SendRequest(const wstring &url,
       fwprintf(stderr, L"Could not unset receive timeout, continuing...\n");
     }
   }
-  
+
   if (!HttpSendRequest(request.get(), NULL, 0,
                        const_cast<char *>(request_body.data()),
                        static_cast<DWORD>(request_body.size()))) {
@@ -215,8 +215,7 @@ bool HTTPUpload::ReadResponse(HINTERNET request, wstring *response) {
   BOOL return_code;
 
   while (((return_code = InternetQueryDataAvailable(request, &bytes_available,
-	  0, 0)) != 0) && bytes_available > 0) {
-
+      0, 0)) != 0) && bytes_available > 0) {
     vector<char> response_buffer(bytes_available);
     DWORD size_read;
 
@@ -323,6 +322,7 @@ bool HTTPUpload::GenerateRequestBody(const map<wstring, wstring> &parameters,
 // static
 bool HTTPUpload::GetFileContents(const wstring &filename,
                                  vector<char> *contents) {
+  bool rv = false;
   // The "open" method on pre-MSVC8 ifstream implementations doesn't accept a
   // wchar_t* filename, so use _wfopen directly in that case.  For VC8 and
   // later, _wfopen has been deprecated in favor of _wfopen_s, which does
@@ -336,15 +336,21 @@ bool HTTPUpload::GetFileContents(const wstring &filename,
   if (file.is_open()) {
     file.seekg(0, ios::end);
     std::streamoff length = file.tellg();
-    contents->resize(length);
-    if (length != 0) {
-      file.seekg(0, ios::beg);
-      file.read(&((*contents)[0]), length);
+    // Check for loss of data when converting lenght from std::streamoff into
+    // std::vector<char>::size_type
+    std::vector<char>::size_type vector_size =
+        static_cast<std::vector<char>::size_type>(length);
+    if (static_cast<std::streamoff>(vector_size) == length) {
+      contents->resize(vector_size);
+      if (length != 0) {
+        file.seekg(0, ios::beg);
+        file.read(&((*contents)[0]), length);
+      }
+      rv = true;
     }
     file.close();
-    return true;
   }
-  return false;
+  return rv;
 }
 
 // static