cmCurl: Adopt helper to fix file:// URLs

Migrate and generalize the helper added by commit e63dcb1378 (Encoding:
Use encoding libcurl expects with file: urls., 2014-11-05,
v3.2.0-rc1~420^2).

1 files changed, 35 insertions, 0 deletions

diff --git a/Source/cmCurl.cxx b/Source/cmCurl.cxx
index 233790e..7a6568e 100644
--- a/Source/cmCurl.cxx
+++ b/Source/cmCurl.cxx
@@ -9,6 +9,14 @@
 #endif
 #include "cmStringAlgorithms.h"
 
+#if defined(_WIN32)
+#  include <vector>
+
+#  include <windows.h>
+
+#  include "cmsys/Encoding.hxx"
+#endif
+
 // curl versions before 7.21.5 did not provide this error code
 #if defined(LIBCURL_VERSION_NUM) && LIBCURL_VERSION_NUM < 0x071505
 #  define CURLE_NOT_BUILT_IN 4
@@ -95,3 +103,30 @@ std::string cmCurlSetNETRCOption(::CURL* curl, const std::string& netrc_level,
   }
   return e;
 }
+
+std::string cmCurlFixFileURL(std::string url)
+{
+  if (!cmHasLiteralPrefix(url, "file://")) {
+    return url;
+  }
+
+#if defined(_WIN32)
+  // libcurl doesn't support file:// urls for unicode filenames on Windows.
+  // Convert string from UTF-8 to ACP if this is a file:// URL.
+  std::wstring wurl = cmsys::Encoding::ToWide(url);
+  if (!wurl.empty()) {
+    int mblen =
+      WideCharToMultiByte(CP_ACP, 0, wurl.c_str(), -1, NULL, 0, NULL, NULL);
+    if (mblen > 0) {
+      std::vector<char> chars(mblen);
+      mblen = WideCharToMultiByte(CP_ACP, 0, wurl.c_str(), -1, &chars[0],
+                                  mblen, NULL, NULL);
+      if (mblen > 0) {
+        url = &chars[0];
+      }
+    }
+  }
+#endif
+
+  return url;
+}