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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_FRAME_URLMON_MONIKER_BASE_H_
#define CHROME_FRAME_URLMON_MONIKER_BASE_H_
#include <atlbase.h>
#include <atlcom.h>
// An implementation of IStream (minus IUnknown) that delegates to
// another source. Most of the methods contain a NOTREACHED() as the
// class is used by the ReadStreamCache class where we don't expect those
// calls under normal circumstances.
class DelegatingReadStream : public IStream {
public:
DelegatingReadStream() {
}
~DelegatingReadStream() {
}
void SetDelegate(IStream* delegate) {
delegate_ = delegate;
}
// ISequentialStream.
STDMETHOD(Read)(void* pv, ULONG cb, ULONG* read) {
return delegate_->Read(pv, cb, read);
}
STDMETHOD(Write)(const void* pv, ULONG cb, ULONG* written) {
NOTREACHED();
return delegate_->Write(pv, cb, written);
}
// IStream.
STDMETHOD(Seek)(LARGE_INTEGER move, DWORD origin, ULARGE_INTEGER* new_pos) {
NOTREACHED();
return delegate_->Seek(move, origin, new_pos);
}
STDMETHOD(SetSize)(ULARGE_INTEGER new_size) {
NOTREACHED();
return delegate_->SetSize(new_size);
}
STDMETHOD(CopyTo)(IStream* stream, ULARGE_INTEGER cb, ULARGE_INTEGER* read,
ULARGE_INTEGER* written) {
NOTREACHED();
return delegate_->CopyTo(stream, cb, read, written);
}
STDMETHOD(Commit)(DWORD commit_flags) {
NOTREACHED();
return delegate_->Commit(commit_flags);
}
STDMETHOD(Revert)() {
NOTREACHED();
return delegate_->Revert();
}
STDMETHOD(LockRegion)(ULARGE_INTEGER offset, ULARGE_INTEGER cb,
DWORD lock_type) {
NOTREACHED();
return delegate_->LockRegion(offset, cb, lock_type);
}
STDMETHOD(UnlockRegion)(ULARGE_INTEGER offset, ULARGE_INTEGER cb,
DWORD lock_type) {
NOTREACHED();
return delegate_->UnlockRegion(offset, cb, lock_type);
}
STDMETHOD(Stat)(STATSTG* stat_stg, DWORD stat_flag) {
DCHECK(delegate_);
return delegate_->Stat(stat_stg, stat_flag);
}
STDMETHOD(Clone)(IStream** stream) {
NOTREACHED();
return delegate_->Clone(stream);
}
protected:
ScopedComPtr<IStream> delegate_;
};
// A very basic implementation of IBinding that forwards all calls
// to a delegate.
class DelegatingBinding : public IBinding {
public:
DelegatingBinding() {
}
~DelegatingBinding() {
}
IBinding* delegate() const {
return delegate_;
}
void SetDelegate(IBinding* delegate) {
delegate_ = delegate;
}
STDMETHOD(Abort)() {
DCHECK(delegate_);
if (!delegate_)
return S_OK;
return delegate_->Abort();
}
STDMETHOD(Suspend)() {
DCHECK(delegate_);
if (!delegate_)
return E_FAIL;
return delegate_->Suspend();
}
STDMETHOD(Resume)() {
DCHECK(delegate_);
if (!delegate_)
return E_FAIL;
return delegate_->Resume();
}
STDMETHOD(SetPriority)(LONG priority) {
DCHECK(delegate_);
if (!delegate_)
return E_FAIL;
return delegate_->SetPriority(priority);
}
STDMETHOD(GetPriority)(LONG* priority) {
DCHECK(delegate_);
if (!delegate_)
return E_FAIL;
return delegate_->GetPriority(priority);
}
STDMETHOD(GetBindResult)(CLSID* protocol, DWORD* result_code,
LPOLESTR* result, DWORD* reserved) {
DCHECK(delegate_);
if (!delegate_)
return E_FAIL;
return delegate_->GetBindResult(protocol, result_code, result, reserved);
}
protected:
ScopedComPtr<IBinding> delegate_;
};
#endif // CHROME_FRAME_URLMON_MONIKER_BASE_H_
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