format.c

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/*
 * Copyright 2005 Jacek Caban
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
#include "urlmon_main.h"
#include "wine/debug.h"
 
WINE_DEFAULT_DEBUG_CHANNEL(urlmon);
 
static WCHAR wszEnumFORMATETC[] = {'_','E','n','u','m','F','O','R','M','A','T','E','T','C','_',0};
 
typedef struct {
    IEnumFORMATETC IEnumFORMATETC_iface;
 
    FORMATETC *fetc;
    UINT fetc_cnt;
    UINT it;
 
    LONG ref;
} EnumFORMATETC;
 
static inline EnumFORMATETC *impl_from_IEnumFORMATETC(IEnumFORMATETC *iface)
{
    return CONTAINING_RECORD(iface, EnumFORMATETC, IEnumFORMATETC_iface);
}
 
static IEnumFORMATETC *EnumFORMATETC_Create(UINT cfmtetc, const FORMATETC *rgfmtetc, UINT it);
 
static HRESULT WINAPI EnumFORMATETC_QueryInterface(IEnumFORMATETC *iface, REFIID riid, void **ppv)
{
    EnumFORMATETC *This = impl_from_IEnumFORMATETC(iface);
 
    TRACE("(%p)->(%s %p)\n", This, debugstr_guid(riid), ppv);
 
    *ppv = NULL;
 
    if(IsEqualGUID(&IID_IUnknown, riid) || IsEqualGUID(&IID_IEnumFORMATETC, riid)) {
        IEnumFORMATETC_AddRef(iface);
        *ppv = iface;
        return S_OK;
    }
 
    WARN("not supported interface %s\n", debugstr_guid(riid));
    return E_NOINTERFACE;
}
 
static ULONG WINAPI EnumFORMATETC_AddRef(IEnumFORMATETC *iface)
{
    EnumFORMATETC *This = impl_from_IEnumFORMATETC(iface);
    LONG ref = InterlockedIncrement(&This->ref);
    TRACE("(%p) ref=%d\n", This, ref);
    return ref;
}
 
static ULONG WINAPI EnumFORMATETC_Release(IEnumFORMATETC *iface)
{
    EnumFORMATETC *This = impl_from_IEnumFORMATETC(iface);
    LONG ref = InterlockedDecrement(&This->ref);
 
    TRACE("(%p) ref=%d\n", This, ref);
 
    if(!ref) {
        heap_free(This->fetc);
        heap_free(This);
 
        URLMON_UnlockModule();
    }
 
    return ref;
}
 
static HRESULT WINAPI EnumFORMATETC_Next(IEnumFORMATETC *iface, ULONG celt,
        FORMATETC *rgelt, ULONG *pceltFetched)
{
    EnumFORMATETC *This = impl_from_IEnumFORMATETC(iface);
    ULONG cnt;
 
    TRACE("(%p)->(%d %p %p)\n", This, celt, rgelt, pceltFetched);
 
    if(!rgelt)
        return E_INVALIDARG;
 
    if(This->it >= This->fetc_cnt || !celt) {
        if(pceltFetched)
            *pceltFetched = 0;
        return celt ? S_FALSE : S_OK;
    }
 
    cnt = This->fetc_cnt-This->it > celt ? celt : This->fetc_cnt-This->it;
 
    memcpy(rgelt, This->fetc+This->it, cnt*sizeof(FORMATETC));
    This->it += cnt;
 
    if(pceltFetched)
        *pceltFetched = cnt;
 
    return cnt == celt ? S_OK : S_FALSE;
}
 
static HRESULT WINAPI EnumFORMATETC_Skip(IEnumFORMATETC *iface, ULONG celt)
{
    EnumFORMATETC *This = impl_from_IEnumFORMATETC(iface);
 
    TRACE("(%p)->(%d)\n", This, celt);
 
    This->it += celt;
    return This->it > This->fetc_cnt ? S_FALSE : S_OK;
}
 
static HRESULT WINAPI EnumFORMATETC_Reset(IEnumFORMATETC *iface)
{
    EnumFORMATETC *This = impl_from_IEnumFORMATETC(iface);
 
    TRACE("(%p)\n", This);
 
    This->it = 0;
    return S_OK;
}
 
static HRESULT WINAPI EnumFORMATETC_Clone(IEnumFORMATETC *iface, IEnumFORMATETC **ppenum)
{
    EnumFORMATETC *This = impl_from_IEnumFORMATETC(iface);
 
    TRACE("(%p)->(%p)\n", This, ppenum);
 
    if(!ppenum)
        return E_INVALIDARG;
 
    *ppenum = EnumFORMATETC_Create(This->fetc_cnt, This->fetc, This->it);
    return S_OK;
}
 
static const IEnumFORMATETCVtbl EnumFORMATETCVtbl = {
    EnumFORMATETC_QueryInterface,
    EnumFORMATETC_AddRef,
    EnumFORMATETC_Release,
    EnumFORMATETC_Next,
    EnumFORMATETC_Skip,
    EnumFORMATETC_Reset,
    EnumFORMATETC_Clone
};
 
static IEnumFORMATETC *EnumFORMATETC_Create(UINT cfmtetc, const FORMATETC *rgfmtetc, UINT it)
{
    EnumFORMATETC *ret = heap_alloc(sizeof(EnumFORMATETC));
 
    URLMON_LockModule();
 
    ret->IEnumFORMATETC_iface.lpVtbl = &EnumFORMATETCVtbl;
    ret->ref = 1;
    ret->it = it;
    ret->fetc_cnt = cfmtetc;
 
    ret->fetc = heap_alloc(cfmtetc*sizeof(FORMATETC));
    memcpy(ret->fetc, rgfmtetc, cfmtetc*sizeof(FORMATETC));
 
    return &ret->IEnumFORMATETC_iface;
}
 
/**********************************************************
 *      CreateFormatEnumerator (urlmon.@)
 */
HRESULT WINAPI CreateFormatEnumerator(UINT cfmtetc, FORMATETC *rgfmtetc,
        IEnumFORMATETC** ppenumfmtetc)
{
    TRACE("(%d %p %p)\n", cfmtetc, rgfmtetc, ppenumfmtetc);
 
    if(!ppenumfmtetc)
        return E_INVALIDARG;
    if(!cfmtetc)
        return E_FAIL;
 
    *ppenumfmtetc = EnumFORMATETC_Create(cfmtetc, rgfmtetc, 0);
    return S_OK;
}
 
/**********************************************************
 *      RegisterFormatEnumerator (urlmon.@)
 */
HRESULT WINAPI RegisterFormatEnumerator(LPBC pBC, IEnumFORMATETC *pEFetc, DWORD reserved)
{
    TRACE("(%p %p %d)\n", pBC, pEFetc, reserved);
 
    if(reserved)
        WARN("reserved != 0\n");
 
    if(!pBC || !pEFetc)
        return E_INVALIDARG;
 
    return IBindCtx_RegisterObjectParam(pBC, wszEnumFORMATETC, (IUnknown*)pEFetc);
}
 
/**********************************************************
 *      RevokeFormatEnumerator (urlmon.@)
 */
HRESULT WINAPI RevokeFormatEnumerator(LPBC pbc, IEnumFORMATETC *pEFetc)
{
    TRACE("(%p %p)\n", pbc, pEFetc);
 
    if(!pbc)
        return E_INVALIDARG;
 
    return IBindCtx_RevokeObjectParam(pbc, wszEnumFORMATETC);
}