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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
#include <ole2.h>
#include "SkIStream.h"
#include "SkStream.h"
/**
* SkBaseIStream
*/
SkBaseIStream::SkBaseIStream() : _refcount(1) { }
SkBaseIStream::~SkBaseIStream() { }
HRESULT STDMETHODCALLTYPE SkBaseIStream::QueryInterface(REFIID iid
, void ** ppvObject)
{
if (NULL == ppvObject) {
return E_INVALIDARG;
}
if (iid == __uuidof(IUnknown)
|| iid == __uuidof(IStream)
|| iid == __uuidof(ISequentialStream))
{
*ppvObject = static_cast<IStream*>(this);
AddRef();
return S_OK;
} else {
*ppvObject = NULL;
return E_NOINTERFACE;
}
}
ULONG STDMETHODCALLTYPE SkBaseIStream::AddRef(void) {
return (ULONG)InterlockedIncrement(&_refcount);
}
ULONG STDMETHODCALLTYPE SkBaseIStream::Release(void) {
ULONG res = (ULONG) InterlockedDecrement(&_refcount);
if (0 == res) {
delete this;
}
return res;
}
// ISequentialStream Interface
HRESULT STDMETHODCALLTYPE SkBaseIStream::Read(void* pv
, ULONG cb
, ULONG* pcbRead)
{ return E_NOTIMPL; }
HRESULT STDMETHODCALLTYPE SkBaseIStream::Write(void const* pv
, ULONG cb
, ULONG* pcbWritten)
{ return E_NOTIMPL; }
// IStream Interface
HRESULT STDMETHODCALLTYPE SkBaseIStream::SetSize(ULARGE_INTEGER)
{ return E_NOTIMPL; }
HRESULT STDMETHODCALLTYPE SkBaseIStream::CopyTo(IStream*
, ULARGE_INTEGER
, ULARGE_INTEGER*
, ULARGE_INTEGER*)
{ return E_NOTIMPL; }
HRESULT STDMETHODCALLTYPE SkBaseIStream::Commit(DWORD)
{ return E_NOTIMPL; }
HRESULT STDMETHODCALLTYPE SkBaseIStream::Revert(void)
{ return E_NOTIMPL; }
HRESULT STDMETHODCALLTYPE SkBaseIStream::LockRegion(ULARGE_INTEGER
, ULARGE_INTEGER
, DWORD)
{ return E_NOTIMPL; }
HRESULT STDMETHODCALLTYPE SkBaseIStream::UnlockRegion(ULARGE_INTEGER
, ULARGE_INTEGER
, DWORD)
{ return E_NOTIMPL; }
HRESULT STDMETHODCALLTYPE SkBaseIStream::Clone(IStream **)
{ return E_NOTIMPL; }
HRESULT STDMETHODCALLTYPE SkBaseIStream::Seek(LARGE_INTEGER liDistanceToMove
, DWORD dwOrigin
, ULARGE_INTEGER* lpNewFilePointer)
{ return E_NOTIMPL; }
HRESULT STDMETHODCALLTYPE SkBaseIStream::Stat(STATSTG* pStatstg
, DWORD grfStatFlag)
{ return E_NOTIMPL; }
/**
* SkIStream
*/
SkIStream::SkIStream(SkStream* stream, bool unrefOnRelease)
: SkBaseIStream()
, fSkStream(stream)
, fUnrefOnRelease(unrefOnRelease)
, fLocation()
{
this->fSkStream->rewind();
}
SkIStream::~SkIStream() {
if (NULL != this->fSkStream && fUnrefOnRelease) {
this->fSkStream->unref();
}
}
HRESULT SkIStream::CreateFromSkStream(SkStream* stream
, bool unrefOnRelease
, IStream ** ppStream)
{
*ppStream = new SkIStream(stream, unrefOnRelease);
return S_OK;
}
// ISequentialStream Interface
HRESULT STDMETHODCALLTYPE SkIStream::Read(void* pv, ULONG cb, ULONG* pcbRead) {
*pcbRead = this->fSkStream->read(pv, cb);
this->fLocation.QuadPart += *pcbRead;
return (*pcbRead == cb) ? S_OK : S_FALSE;
}
HRESULT STDMETHODCALLTYPE SkIStream::Write(void const* pv
, ULONG cb
, ULONG* pcbWritten)
{
return STG_E_CANTSAVE;
}
// IStream Interface
HRESULT STDMETHODCALLTYPE SkIStream::Seek(LARGE_INTEGER liDistanceToMove
, DWORD dwOrigin
, ULARGE_INTEGER* lpNewFilePointer)
{
HRESULT hr = S_OK;
switch(dwOrigin) {
case STREAM_SEEK_SET: {
if (!this->fSkStream->rewind()) {
hr = E_FAIL;
} else {
size_t skipped = this->fSkStream->skip(
static_cast<size_t>(liDistanceToMove.QuadPart)
);
this->fLocation.QuadPart = skipped;
if (skipped != liDistanceToMove.QuadPart) {
hr = E_FAIL;
}
}
break;
}
case STREAM_SEEK_CUR: {
size_t skipped = this->fSkStream->skip(
static_cast<size_t>(liDistanceToMove.QuadPart)
);
this->fLocation.QuadPart += skipped;
if (skipped != liDistanceToMove.QuadPart) {
hr = E_FAIL;
}
break;
}
case STREAM_SEEK_END: {
if (!this->fSkStream->rewind()) {
hr = E_FAIL;
} else {
LONGLONG skip = this->fSkStream->getLength()
+ liDistanceToMove.QuadPart;
size_t skipped = this->fSkStream->skip(static_cast<size_t>(skip));
this->fLocation.QuadPart = skipped;
if (skipped != skip) {
hr = E_FAIL;
}
}
break;
}
default:
hr = STG_E_INVALIDFUNCTION;
break;
}
if (NULL != lpNewFilePointer) {
lpNewFilePointer->QuadPart = this->fLocation.QuadPart;
}
return hr;
}
HRESULT STDMETHODCALLTYPE SkIStream::Stat(STATSTG* pStatstg
, DWORD grfStatFlag)
{
if (0 == (grfStatFlag & STATFLAG_NONAME)) {
return STG_E_INVALIDFLAG;
}
pStatstg->pwcsName = NULL;
pStatstg->cbSize.QuadPart = this->fSkStream->getLength();
pStatstg->clsid = CLSID_NULL;
pStatstg->type = STGTY_STREAM;
pStatstg->grfMode = STGM_READ;
return S_OK;
}
/**
* SkIWStream
*/
SkWIStream::SkWIStream(SkWStream* stream)
: SkBaseIStream()
, fSkWStream(stream)
{ }
SkWIStream::~SkWIStream() {
if (NULL != this->fSkWStream) {
this->fSkWStream->flush();
}
}
HRESULT SkWIStream::CreateFromSkWStream(SkWStream* stream
, IStream ** ppStream)
{
*ppStream = new SkWIStream(stream);
return S_OK;
}
// ISequentialStream Interface
HRESULT STDMETHODCALLTYPE SkWIStream::Write(void const* pv
, ULONG cb
, ULONG* pcbWritten)
{
HRESULT hr = S_OK;
bool wrote = this->fSkWStream->write(pv, cb);
if (wrote) {
*pcbWritten = cb;
} else {
*pcbWritten = 0;
hr = S_FALSE;
}
return hr;
}
// IStream Interface
HRESULT STDMETHODCALLTYPE SkWIStream::Commit(DWORD) {
this->fSkWStream->flush();
return S_OK;
}
HRESULT STDMETHODCALLTYPE SkWIStream::Stat(STATSTG* pStatstg
, DWORD grfStatFlag)
{
if (0 == (grfStatFlag & STATFLAG_NONAME)) {
return STG_E_INVALIDFLAG;
}
pStatstg->pwcsName = NULL;
pStatstg->cbSize.QuadPart = 0;
pStatstg->clsid = CLSID_NULL;
pStatstg->type = STGTY_STREAM;
pStatstg->grfMode = STGM_WRITE;
return S_OK;
}
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