/**
Delivers the request to the end of plugin thread's queue.
In certain circumstances, where the request requires priority handling
it adds it to the front of the queue.
@param aRequest: The request to be delivered
@return KErrNone
*/
EXPORT_C TInt CFsPlugin::Deliver(TFsPluginRequest& aRequest)
{
__ASSERT_ALWAYS(iThreadP != NULL, User::Panic(_L("CFsPlugin::Dispatch"),999));
TInt function = aRequest.Function();
if(function == EFsPluginOpen)
{
// Don't dispatch open requests to the plugin thread
return KPluginMessageForward;
}
if(function == EFsPluginDoRequest ||
function == EFsPluginDoControl ||
function == EFsPluginDoCancel)
{
iThreadP->DeliverFront(aRequest.Request());
}
else
{
iThreadP->DeliverBack(aRequest.Request());
}
return KErrNone;
}
/**
@prototype
@deprecated
@see RFilePlugin::Read
*/
EXPORT_C TInt CFsPlugin::FileRead(TFsPluginRequest& aRequest, TDes8& aDes, TInt64 aPos)
{
CFileShare* share;
CFileCB* file;
GetFileFromScratch((CFsMessageRequest*) aRequest.Request(), share, file);
TInt64 fileSize = file->CachedSize64();
if (aPos > fileSize)
aPos = fileSize;
TInt len = aDes.Length();
if (aPos >= fileSize)
len = 0;
if (aPos + len > fileSize)
// filesize - pos shall of TInt size
// Hence to suppress warning
len = (TInt)(fileSize - aPos);
aDes.SetLength(len);
return DispatchOperation(aRequest, aDes, aPos, EFsFileRead);
}
/** @prototype */
EXPORT_C TInt CFsPlugin::ClientRead(TFsPluginRequest& aRequest, TDes8& aDes, TInt aOffset)
{
CFsMessageRequest& msgRequest = * (CFsMessageRequest*) aRequest.Request();
TMsgOperation& currentOperation = msgRequest.CurrentOperation();
TInt r = KErrNone;
if (currentOperation.iClientRequest)
{
r = msgRequest.Read(0, aDes, aOffset);
}
else
{
TInt len = aDes.Length();
if (len > (currentOperation.iReadWriteArgs.iTotalLength - aOffset))
return KErrArgument;
aDes.Copy ( (TUint8*) currentOperation.iReadWriteArgs.iData + aOffset, len );
currentOperation.iReadWriteArgs.iOffset = aOffset + len;
}
return r;
}
/**
@internalTechnology
@prototype
@deprecated
Pushes a msgop, dispatches it and waits for it to complete
*/
TInt CFsPlugin::DispatchOperation(TFsPluginRequest& aRequest, TDes8& aDes, TInt64 aPos, TInt aFunction)
{
if (aRequest.Function() != EFsFileRead && aRequest.Function() != EFsFileWrite)
return KErrNotSupported;
if (aFunction != EFsFileRead && aFunction != EFsFileWrite)
return KErrNotSupported;
CFsMessageRequest& msgRequest = * (CFsMessageRequest*) aRequest.Request();
TInt len = aDes.Length();
if (len <= 0)
return CFsRequest::EReqActionComplete;
TUint8* ptr = (TUint8*) aDes.Ptr();
TInt r = msgRequest.PushOperation(
aPos, len, ptr,
0, // aOffset
Complete, // callback
0, // next state
aFunction);
if (r != KErrNone)
return r;
CFsPlugin* plugin = this;
FsPluginManager::ReadLockChain();
FsPluginManager::NextPlugin(plugin, &msgRequest);
msgRequest.iCurrentPlugin = plugin;
msgRequest.Dispatch();
FsPluginManager::UnlockChain();
iThreadP->OperationLockWait();
aDes.SetLength(len);
return msgRequest.LastError(); // KErrNone;
}