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gecko-dev/uriloader/exthandler/win/nsOSHelperAppService.cpp

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/* -*- Mode: C++; tab-width: 3; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim:set ts=2 sts=2 sw=2 et cin:
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Mozilla browser.
*
* The Initial Developer of the Original Code is
* Netscape Communications, Inc.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Scott MacGregor <mscott@netscape.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsOSHelperAppService.h"
#include "nsISupports.h"
#include "nsString.h"
#include "nsXPIDLString.h"
#include "nsIURL.h"
#include "nsIMIMEInfo.h"
#include "nsMIMEInfoWin.h"
#include "nsMimeTypes.h"
#include "nsILocalFileWin.h"
#include "nsIProcess.h"
#include "plstr.h"
#include "nsAutoPtr.h"
#include "nsNativeCharsetUtils.h"
// we need windows.h to read out registry information...
#include <windows.h>
// shellapi.h is needed to build with WIN32_LEAN_AND_MEAN
#include <shellapi.h>
#define LOG(args) PR_LOG(mLog, PR_LOG_DEBUG, args)
// helper methods: forward declarations...
static BYTE * GetValueBytes( HKEY hKey, const char *pValueName, DWORD *pLen=0);
static nsresult GetExtensionFrom4xRegistryInfo(const char * aMimeType, nsString& aFileExtension);
static nsresult GetExtensionFromWindowsMimeDatabase(const char * aMimeType, nsString& aFileExtension);
// static member
PRBool nsOSHelperAppService::mIsNT = PR_FALSE;
nsOSHelperAppService::nsOSHelperAppService() : nsExternalHelperAppService()
{
OSVERSIONINFO osversion;
::ZeroMemory(&osversion, sizeof(OSVERSIONINFO));
osversion.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
if (!GetVersionEx(&osversion)) {
// If the call failed, better be safe and assume *W functions don't work
mIsNT = PR_FALSE;
}
else {
mIsNT = (osversion.dwPlatformId == VER_PLATFORM_WIN32_NT);
}
}
nsOSHelperAppService::~nsOSHelperAppService()
{}
// The windows registry provides a mime database key which lists a set of mime types and corresponding "Extension" values.
// we can use this to look up our mime type to see if there is a preferred extension for the mime type.
static nsresult GetExtensionFromWindowsMimeDatabase(const char * aMimeType, nsString& aFileExtension)
{
#ifdef WINCE // WinCE doesn't support helper applications yet
return NS_ERROR_NOT_IMPLEMENTED;
#else
HKEY hKey;
nsCAutoString mimeDatabaseKey ("MIME\\Database\\Content Type\\");
mimeDatabaseKey += aMimeType;
LONG err = ::RegOpenKeyEx( HKEY_CLASSES_ROOT, mimeDatabaseKey.get(), 0, KEY_QUERY_VALUE, &hKey);
if (err == ERROR_SUCCESS)
{
nsOSHelperAppService::GetValueString(hKey,
NS_LITERAL_STRING("Extension").get(),
aFileExtension);
::RegCloseKey(hKey);
}
return NS_OK;
#endif
}
// We have a serious problem!! I have this content type and the windows registry only gives me
// helper apps based on extension. Right now, we really don't have a good place to go for
// trying to figure out the extension for a particular mime type....One short term hack is to look
// this information in 4.x (it's stored in the windows regsitry).
static nsresult GetExtensionFrom4xRegistryInfo(const char * aMimeType, nsString& aFileExtension)
{
#ifdef WINCE // WinCE doesn't support helper applications yet.
return NS_ERROR_FAILURE;
#else
nsCAutoString command ("Software\\Netscape\\Netscape Navigator\\Suffixes");
nsresult rv = NS_OK;
HKEY hKey;
LONG err = ::RegOpenKeyEx( HKEY_CURRENT_USER, command.get(), 0, KEY_QUERY_VALUE, &hKey);
if (err == ERROR_SUCCESS)
{
PRBool found = nsOSHelperAppService::GetValueString( hKey,
NS_ConvertASCIItoUTF16(aMimeType).get(), aFileExtension);
if (found) // only try to get the extension if we have a value!
{
aFileExtension.Insert(PRUnichar('.'), 0);
// this may be a comma separate list of extensions...just take the first one
// for now...
PRInt32 pos = aFileExtension.FindChar(PRUnichar(','));
if (pos > 0) // we have a comma separated list of languages...
aFileExtension.Truncate(pos); // truncate everything after the first comma (including the comma)
}
// close the key
::RegCloseKey(hKey);
}
else
rv = NS_ERROR_FAILURE; // no 4.x extension mapping found!
return rv;
#endif
}
static BYTE * GetValueBytes( HKEY hKey, const char *pValueName, DWORD *pLen)
{
#ifdef WINCE // WinCE doesn't support helper applications yet. This is only called by functions that support helper apps.
return nsnull;
#else
LONG err;
DWORD bufSz;
LPBYTE pBytes = NULL;
err = ::RegQueryValueEx( hKey, pValueName, NULL, NULL, NULL, &bufSz);
if (err == ERROR_SUCCESS) {
pBytes = new BYTE[bufSz];
err = ::RegQueryValueEx( hKey, pValueName, NULL, NULL, pBytes, &bufSz);
if (err != ERROR_SUCCESS) {
delete [] pBytes;
pBytes = NULL;
} else {
// Return length if caller wanted it.
if ( pLen ) {
*pLen = bufSz;
}
}
}
return( pBytes);
#endif
}
/* static */
PRBool nsOSHelperAppService::GetValueString(HKEY hKey, const PRUnichar* pValueName, nsAString& result)
{
if (!mIsNT) {
nsCAutoString cValueName;
if (pValueName)
NS_CopyUnicodeToNative(nsDependentString(pValueName), cValueName);
char* pBytes = (char*)GetValueBytes(hKey, cValueName.get());
if (pBytes) {
nsresult rv = NS_CopyNativeToUnicode(nsDependentCString(pBytes), result);
delete[] pBytes;
return NS_SUCCEEDED(rv);
}
return PR_FALSE;
}
DWORD bufSz;
LONG err = ::RegQueryValueExW( hKey, pValueName, NULL, NULL, NULL, &bufSz);
if (err == ERROR_SUCCESS) {
PRUnichar* pBytes = new PRUnichar[bufSz];
if (!pBytes)
return PR_FALSE;
err = ::RegQueryValueExW( hKey, pValueName, NULL, NULL, (BYTE*)pBytes, &bufSz);
if (err != ERROR_SUCCESS) {
delete [] pBytes;
return PR_FALSE;
} else {
result.Assign(pBytes);
delete [] pBytes;
return PR_TRUE;
}
}
return PR_FALSE;
}
NS_IMETHODIMP nsOSHelperAppService::ExternalProtocolHandlerExists(const char * aProtocolScheme, PRBool * aHandlerExists)
{
#ifdef WINCE // WinCE doesn't support helper applications yet.
return NS_ERROR_NOT_IMPLEMENTED;
#else
// look up the protocol scheme in the windows registry....if we find a match then we have a handler for it...
*aHandlerExists = PR_FALSE;
if (aProtocolScheme && *aProtocolScheme)
{
HKEY hKey;
LONG err = ::RegOpenKeyEx( HKEY_CLASSES_ROOT, aProtocolScheme, 0, KEY_QUERY_VALUE, &hKey);
if (err == ERROR_SUCCESS)
{
*aHandlerExists = PR_TRUE;
// close the key
::RegCloseKey(hKey);
}
}
return NS_OK;
#endif
}
// this implementation was pretty much copied verbatime from Tony Robinson's code in nsExternalProtocolWin.cpp
nsresult nsOSHelperAppService::LoadUriInternal(nsIURI * aURL)
{
#ifdef WINCE // WinCE doesn't support helper applications yet.
return NS_ERROR_NOT_IMPLEMENTED;
#else
nsresult rv = NS_OK;
// 1. Find the default app for this protocol
// 2. Set up the command line
// 3. Launch the app.
// For now, we'll just cheat essentially, check for the command line
// then just call ShellExecute()!
if (aURL)
{
// extract the url spec from the url
nsCAutoString urlSpec;
aURL->GetAsciiSpec(urlSpec);
// Some versions of windows (Win2k before SP3, Win XP before SP1)
// crash in ShellExecute on long URLs (bug 161357).
// IE 5 and 6 support URLS of 2083 chars in length, 2K is safe
const PRUint32 maxSafeURL(2048);
if (urlSpec.Length() > maxSafeURL)
return NS_ERROR_FAILURE;
LONG r = (LONG) ::ShellExecute( NULL, "open", urlSpec.get(), NULL, NULL, SW_SHOWNORMAL);
if (r < 32)
rv = NS_ERROR_FAILURE;
}
return rv;
#endif
}
NS_IMETHODIMP nsOSHelperAppService::GetApplicationDescription(const nsACString& aScheme, nsAString& _retval)
{
nsCAutoString cmdString(aScheme);
cmdString.AppendLiteral("\\shell\\open\\command");
HKEY cmd;
LONG rc = ::RegOpenKeyEx(HKEY_CLASSES_ROOT, cmdString.get(), 0, KEY_QUERY_VALUE, &cmd);
if (rc != ERROR_SUCCESS)
return NS_ERROR_NOT_AVAILABLE;
PRBool found = GetValueString(cmd, NULL, _retval);
::RegCloseKey(cmd);
return found ? NS_OK : NS_ERROR_NOT_AVAILABLE;
}
// GetMIMEInfoFromRegistry: This function obtains the values of some of the nsIMIMEInfo
// attributes for the mimeType/extension associated with the input registry key. The default
// entry for that key is the name of a registry key under HKEY_CLASSES_ROOT. The default
// value for *that* key is the descriptive name of the type. The EditFlags value is a binary
// value; the low order bit of the third byte of which indicates that the user does not need
// to be prompted.
//
// This function sets only the Description attribute of the input nsIMIMEInfo.
/* static */
nsresult nsOSHelperAppService::GetMIMEInfoFromRegistry( const nsAFlatString& fileType, nsIMIMEInfo *pInfo )
{
#ifdef WINCE // WinCE doesn't support helper applications yet.
return NS_ERROR_NOT_IMPLEMENTED;
#else
nsresult rv = NS_OK;
NS_ENSURE_ARG( pInfo );
// Get registry key for the pointed-to "file type."
HKEY fileTypeKey = 0;
LONG rc;
if (mIsNT) {
rc = ::RegOpenKeyExW( HKEY_CLASSES_ROOT, fileType.get(), 0, KEY_QUERY_VALUE, &fileTypeKey );
}
else {
nsCAutoString ansiKey;
rv = NS_CopyUnicodeToNative(fileType, ansiKey);
if (NS_FAILED(rv))
return rv;
rc = ::RegOpenKeyEx( HKEY_CLASSES_ROOT, ansiKey.get(), 0, KEY_QUERY_VALUE, &fileTypeKey );
}
if ( rc != ERROR_SUCCESS )
return NS_ERROR_FAILURE;
// OK, the default value here is the description of the type.
nsAutoString description;
PRBool found = GetValueString(fileTypeKey, NULL, description);
if (found)
pInfo->SetDescription(description);
::RegCloseKey(fileTypeKey);
return NS_OK;
#endif
}
/////////////////////////////////////////////////////////////////////////////////////////////////
// method overrides used to gather information from the windows registry for
// various mime types.
////////////////////////////////////////////////////////////////////////////////////////////////
/// Looks up the type for the extension aExt and compares it to aType
/* static */ PRBool
nsOSHelperAppService::typeFromExtEquals(const PRUnichar* aExt, const char *aType)
{
#ifdef WINCE // WinCE doesn't support helper applications yet.
return PR_FALSE;
#else
if (!aType)
return PR_FALSE;
nsAutoString fileExtToUse;
if (aExt[0] != PRUnichar('.'))
fileExtToUse = PRUnichar('.');
fileExtToUse.Append(aExt);
HKEY hKey;
PRBool eq = PR_FALSE;
LONG err;
if (mIsNT) {
err = ::RegOpenKeyExW(HKEY_CLASSES_ROOT, fileExtToUse.get(), 0, KEY_QUERY_VALUE, &hKey);
}
else {
nsCAutoString ansiKey;
nsresult rv = NS_CopyUnicodeToNative(fileExtToUse, ansiKey);
if (NS_FAILED(rv))
return eq;
err = ::RegOpenKeyEx( HKEY_CLASSES_ROOT, ansiKey.get(), 0, KEY_QUERY_VALUE, &hKey);
}
if (err == ERROR_SUCCESS)
{
LPBYTE pBytes = GetValueBytes(hKey, "Content Type");
if (pBytes)
{
eq = strcmp((const char *)pBytes, aType) == 0;
delete[] pBytes;
}
::RegCloseKey(hKey);
}
return eq;
#endif
}
static void RemoveParameters(nsString& aPath)
{
// Command Strings stored in the Windows registry with parameters look like
// this:
//
// 1) "C:\Program Files\Company Name\product.exe" -foo -bar (long version)
// -- OR --
// 2) C:\PROGRA~1\COMPAN~2\product.exe -foo -bar (short version)
//
// For 1), the path is the first "" quoted string. (quotes are used to
// prevent parameter parsers from choking)
// For 2), the path is the string up until the first space (spaces are
// illegal in short DOS-style paths)
//
if (aPath.First() == PRUnichar('"')) {
aPath = Substring(aPath, 1, aPath.Length() - 1);
PRInt32 nextQuote = aPath.FindChar(PRUnichar('"'));
if (nextQuote != kNotFound)
aPath.Truncate(nextQuote);
}
else {
PRInt32 firstSpace = aPath.FindChar(PRUnichar(' '));
if (firstSpace != kNotFound)
aPath.Truncate(firstSpace);
}
}
//
// The "real" name of a given helper app (as specified by the path to the
// executable file held in various registry keys) is stored n the VERSIONINFO
// block in the file's resources. We need to find the path to the executable
// and then retrieve the "FileDescription" field value from the file.
//
// For a given extension, we find the file handler like so:
//
// HKCR
// \.ext\ <type key> <-- default value
// \<type key>\
// \shell\open\command\ <path+params> <-- default value
//
// We need to do some parsing on the <path+params> to strip off params and
// deal with some Windows quirks (like the fact that many Shell "applications"
// are actually DLLs invoked via rundll32.exe)
//
nsresult
nsOSHelperAppService::GetDefaultAppInfo(nsAString& aTypeName, nsAString& aDefaultDescription,
nsIFile** aDefaultApplication)
{
// If all else fails, use the file type key name, which will be something like "pngfile" for
// .pngs, "WMVFile" for .wmvs, etc.
aDefaultDescription = aTypeName;
*aDefaultApplication = nsnull;
nsCAutoString handlerKeyName;
NS_CopyUnicodeToNative(aTypeName, handlerKeyName);
handlerKeyName += "\\shell\\open\\command";
HKEY handlerKey;
LONG err = ::RegOpenKeyEx(HKEY_CLASSES_ROOT, handlerKeyName.get(), 0, KEY_QUERY_VALUE, &handlerKey);
if (err == ERROR_SUCCESS) {
nsAutoString handlerCommand;
PRBool found = GetValueString(handlerKey, NULL, handlerCommand);
if (found) {
nsAutoString handlerFilePath;
// First look to see if we're invoking a Windows shell service, such as
// the Picture & Fax Viewer, which are invoked through rundll32.exe, and
// so we need to extract the DLL path because that's where the version
// info is held - not in rundll32.exe
//
// The format of rundll32.exe calls is:
//
// rundll32.exe c:\path\to.dll,Function %args
//
// What we want is the DLL - since that's where the real application name
// is stored, e.g. zipfldr.dll, shimgvw.dll, etc.
//
// Working from the end of the registry value, the path begins at the last
// comma in the string (stripping off Function and args) to the position
// just after the first space (the space after rundll32.exe).
//
NS_NAMED_LITERAL_STRING(rundllSegment, "rundll32.exe ");
if (StringBeginsWith(handlerCommand, rundllSegment)) {
PRInt32 lastCommaPos = handlerCommand.RFindChar(',');
PRUint32 rundllSegmentLength = rundllSegment.Length();
if (lastCommaPos != kNotFound)
handlerFilePath = Substring(handlerCommand, rundllSegmentLength,
lastCommaPos - rundllSegmentLength);
else
handlerFilePath = Substring(handlerCommand, rundllSegmentLength,
handlerCommand.Length() - rundllSegmentLength);
}
else
handlerFilePath = handlerCommand;
// Trim any command parameters so that we have a native path we can
// initialize a local file with...
RemoveParameters(handlerFilePath);
// Similarly replace embedded environment variables... (this must be done
// AFTER |RemoveParameters| since it may introduce spaces into the path string)
TCHAR* destination = nsnull;
nsCAutoString nativeHandlerFilePath;
NS_CopyUnicodeToNative(handlerFilePath, nativeHandlerFilePath);
DWORD required = ::ExpandEnvironmentStrings(nativeHandlerFilePath.get(), destination, 0);
destination = new TCHAR[required];
if (!destination) {
::RegCloseKey(handlerKey);
delete[] destination;
destination = nsnull;
return NS_ERROR_OUT_OF_MEMORY;
}
::ExpandEnvironmentStrings(nativeHandlerFilePath.get(), destination, required);
NS_CopyNativeToUnicode(nsDependentCString(destination), handlerFilePath);
delete[] destination;
destination = nsnull;
nsCOMPtr<nsILocalFile> lf;
NS_NewLocalFile(handlerFilePath, PR_TRUE, getter_AddRefs(lf));
if (!lf) {
::RegCloseKey(handlerKey);
delete[] destination;
destination = nsnull;
return NS_ERROR_OUT_OF_MEMORY;
}
nsILocalFileWin* lfw = nsnull;
nsresult rv = CallQueryInterface(lf, &lfw);
if (NS_SUCCEEDED(rv) && lfw) {
// The "FileDescription" field contains the actual name of the application.
lfw->GetVersionInfoField("FileDescription", aDefaultDescription);
// QI addref'ed for us.
*aDefaultApplication = lfw;
}
}
::RegCloseKey(handlerKey);
}
return NS_OK;
}
already_AddRefed<nsMIMEInfoWin> nsOSHelperAppService::GetByExtension(const nsAFlatString& aFileExt, const char *aTypeHint)
{
#ifdef WINCE // WinCE doesn't support helper applications yet
return nsnull;
#else
if (aFileExt.IsEmpty())
return nsnull;
// windows registry assumes your file extension is going to include the '.'.
// so make sure it's there...
nsAutoString fileExtToUse;
if (aFileExt.First() != PRUnichar('.'))
fileExtToUse = PRUnichar('.');
fileExtToUse.Append(aFileExt);
// o.t. try to get an entry from the windows registry.
HKEY hKey;
LONG err;
if (mIsNT) {
err = ::RegOpenKeyExW(HKEY_CLASSES_ROOT, fileExtToUse.get(), 0, KEY_QUERY_VALUE, &hKey);
}
else {
nsCAutoString ansiKey;
nsresult rv = NS_CopyUnicodeToNative(fileExtToUse, ansiKey);
if (NS_FAILED(rv))
return nsnull;
err = ::RegOpenKeyEx( HKEY_CLASSES_ROOT, ansiKey.get(), 0, KEY_QUERY_VALUE, &hKey);
}
if (err == ERROR_SUCCESS)
{
nsCAutoString typeToUse;
if (aTypeHint && *aTypeHint) {
typeToUse.Assign(aTypeHint);
}
else {
LPBYTE pBytes = GetValueBytes( hKey, "Content Type");
if (pBytes)
typeToUse.Assign((const char*)pBytes);
delete [] pBytes;
}
nsAutoString description;
PRBool found = GetValueString(hKey, NULL, description);
nsMIMEInfoWin* mimeInfo = new nsMIMEInfoWin(typeToUse);
if (mimeInfo)
{
NS_ADDREF(mimeInfo);
// don't append the '.'
mimeInfo->AppendExtension(NS_ConvertUTF16toUTF8(Substring(fileExtToUse, 1)));
mimeInfo->SetPreferredAction(nsIMIMEInfo::useSystemDefault);
nsAutoString defaultDescription;
nsCOMPtr<nsIFile> defaultApplication;
GetDefaultAppInfo(description, defaultDescription, getter_AddRefs(defaultApplication));
mimeInfo->SetDefaultDescription(defaultDescription);
mimeInfo->SetDefaultApplicationHandler(defaultApplication);
// Get other nsIMIMEInfo fields from registry, if possible.
if ( found )
{
GetMIMEInfoFromRegistry( description, mimeInfo );
}
}
else {
NS_IF_RELEASE(mimeInfo); // we failed to really find an entry in the registry
}
// close the key
::RegCloseKey(hKey);
return mimeInfo;
}
// we failed to find a mime type.
return nsnull;
#endif
}
already_AddRefed<nsIMIMEInfo> nsOSHelperAppService::GetMIMEInfoFromOS(const nsACString& aMIMEType, const nsACString& aFileExt, PRBool *aFound)
{
*aFound = PR_TRUE;
const nsCString& flatType = PromiseFlatCString(aMIMEType);
const nsCString& flatExt = PromiseFlatCString(aFileExt);
nsAutoString fileExtension;
/* XXX The Equals is a gross hack to wallpaper over the most common Win32
* extension issues caused by the fix for bug 116938. See bug
* 120327, comment 271 for why this is needed. Not even sure we
* want to remove this once we have fixed all this stuff to work
* right; any info we get from the OS on this type is pretty much
* useless....
* We'll do extension-based lookup for this type later in this function.
*/
if (!aMIMEType.LowerCaseEqualsLiteral(APPLICATION_OCTET_STREAM)) {
// (1) try to use the windows mime database to see if there is a mapping to a file extension
// (2) try to see if we have some left over 4.x registry info we can peek at...
GetExtensionFromWindowsMimeDatabase(flatType.get(), fileExtension);
LOG(("Windows mime database: extension '%s'\n", fileExtension.get()));
if (fileExtension.IsEmpty()) {
GetExtensionFrom4xRegistryInfo(flatType.get(), fileExtension);
LOG(("4.x Registry: extension '%s'\n", fileExtension.get()));
}
}
// If we found an extension for the type, do the lookup
nsMIMEInfoWin* mi = nsnull;
if (!fileExtension.IsEmpty())
mi = GetByExtension(fileExtension, flatType.get()).get();
LOG(("Extension lookup on '%s' found: 0x%p\n", fileExtension.get(), mi));
PRBool hasDefault = PR_FALSE;
if (mi) {
mi->GetHasDefaultHandler(&hasDefault);
// OK. We might have the case that |aFileExt| is a valid extension for the
// mimetype we were given. In that case, we do want to append aFileExt
// to the mimeinfo that we have. (E.g.: We are asked for video/mpeg and
// .mpg, but the primary extension for video/mpeg is .mpeg. But because
// .mpg is an extension for video/mpeg content, we want to append it)
if (!aFileExt.IsEmpty() && typeFromExtEquals(NS_ConvertUTF8toUTF16(flatExt).get(), flatType.get())) {
LOG(("Appending extension '%s' to mimeinfo, because its mimetype is '%s'\n",
flatExt.get(), flatType.get()));
PRBool extExist = PR_FALSE;
mi->ExtensionExists(aFileExt, &extExist);
if (!extExist)
mi->AppendExtension(aFileExt);
}
}
if (!mi || !hasDefault) {
nsRefPtr<nsMIMEInfoWin> miByExt =
GetByExtension(NS_ConvertUTF8toUTF16(aFileExt), flatType.get());
LOG(("Ext. lookup for '%s' found 0x%p\n", flatExt.get(), miByExt.get()));
if (!miByExt && mi)
return mi;
if (miByExt && !mi) {
miByExt.swap(mi);
return mi;
}
if (!miByExt && !mi) {
*aFound = PR_FALSE;
mi = new nsMIMEInfoWin(flatType);
if (mi) {
NS_ADDREF(mi);
if (!aFileExt.IsEmpty())
mi->AppendExtension(aFileExt);
}
return mi;
}
// if we get here, mi has no default app. copy from extension lookup.
nsCOMPtr<nsIFile> defaultApp;
nsAutoString desc;
miByExt->GetDefaultDescription(desc);
mi->SetDefaultDescription(desc);
}
return mi;
}
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