This CL makes Chrome on par with Firefox in terms of 'GetSuggestedFilename' for file download via context-menu.

For a download initiated with a click on a link in a web page, a webkit-side change is necessary, which will be done later.

Add a field (referrer_charset) to URLRequestContext and DownloadCreateInfo. It's set to the character encoding of a document where the download request originates from when it's known (download initiated via "save as" in the context menu). 

If it's not known (a download initiated by clicking on a download link or typing a url directly to the omnibox), it's initialized to the default character encoding in the user's preference. I guess this is marginally better than leaving it empty (in that case, step 2b below will be skipped and step 2c will be taken) because a user has a better control over how raw 8bit characters in C-D are interpreted (especially on Windows where a reboot is required to change the OS default codepage). 

This is later passed to GetSuggestedFilename and used as one of fallback encodings (1. UTF-8, 2. origin_charset, 3. default OS codepage). With this change, we support the following:

1. RFC 2047
2. Raw-8bit-characters : a. UTF-8, b. origin_charset, c. default os codepage. 
3. %-escaped UTF-8. 

In this CL, for #3, I didn't add a fallback similar to one used for #2. If necessary, it can be added easily. New entries are added to 3 existing tests. What's previously not covered (raw 8bit Content-Disposition header) is now covered in all 3 tests. 

BUG=1148
TEST=net unit test: NetUtilTest.GetFileNameFromCD                    
                    NetUtilTest.GetSuggestedFilename         
     unittest : DownloadManagerTest.TestDownloadFilename

Review URL: http://codereview.chromium.org/83002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@15113 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 3 insertions, 0 deletions

diff --git a/chrome/browser/download/download_manager.cc b/chrome/browser/download/download_manager.cc
index 5a5649c..0fc444f 100644
--- a/chrome/browser/download/download_manager.cc
+++ b/chrome/browser/download/download_manager.cc
@@ -1085,8 +1085,10 @@ int DownloadManager::RemoveAllDownloads() {
 // download.
 void DownloadManager::DownloadUrl(const GURL& url,
                                   const GURL& referrer,
+                                  const std::string& referrer_charset,
                                   WebContents* web_contents) {
   DCHECK(web_contents);
+  request_context_->set_referrer_charset(referrer_charset);
   file_manager_->DownloadUrl(url,
                              referrer,
                              web_contents->process()->pid(),
@@ -1179,6 +1181,7 @@ void DownloadManager::GenerateFilename(DownloadCreateInfo* info,
   *generated_name = FilePath::FromWStringHack(
       net::GetSuggestedFilename(GURL(info->url),
                                 info->content_disposition,
+                                info->referrer_charset,
                                 L"download"));
   DCHECK(!generated_name->empty());