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combase: Introduce a hstring_header struct to hstring_private.

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Also move the reference flag to the hstring_header struct.

Signed-off-by: Bernhard Kölbl <besentv@gmail.com>
Signed-off-by: Huw Davies <huw@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Bernhard Kölbl 2022-01-24 16:09:20 +01:00 committed by Alexandre Julliard
parent d372fdfd7d
commit 059795be42
2 changed files with 30 additions and 16 deletions
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44
dlls/combase/string.c
View file

@ -26,31 +26,38 @@
WINE_DEFAULT_DEBUG_CHANNEL(winstring);
#define HSTRING_REFERENCE_FLAG 1
struct hstring_header
{
UINT32 flags;
};
struct hstring_private
{
struct hstring_header header;
LPWSTR buffer;
UINT32 length;
BOOL reference;
LONG refcount;
};
static const WCHAR empty[1];
C_ASSERT(sizeof(struct hstring_private) <= sizeof(HSTRING_HEADER));
C_ASSERT(sizeof(struct hstring_header) <= sizeof(HSTRING_HEADER));
static inline struct hstring_private *impl_from_HSTRING(HSTRING string)
{
return (struct hstring_private *)string;
return (struct hstring_private *)string;
}
static inline struct hstring_private *impl_from_HSTRING_HEADER(HSTRING_HEADER *header)
{
return (struct hstring_private *)header;
return CONTAINING_RECORD(header, struct hstring_private, header);
}
static inline struct hstring_private *impl_from_HSTRING_BUFFER(HSTRING_BUFFER buffer)
{
return (struct hstring_private *)buffer;
return CONTAINING_RECORD(buffer, struct hstring_private, buffer);
}
static BOOL alloc_string(UINT32 len, HSTRING *out)
@ -59,11 +66,13 @@ static BOOL alloc_string(UINT32 len, HSTRING *out)
priv = HeapAlloc(GetProcessHeap(), 0, sizeof(*priv) + (len + 1) * sizeof(*priv->buffer));
if (!priv)
return FALSE;
priv->header.flags = 0;
priv->buffer = (LPWSTR)(priv + 1);
priv->length = len;
priv->reference = FALSE;
priv->refcount = 1;
priv->buffer[len] = '\0';
*out = (HSTRING)priv;
return TRUE;
}
@ -115,10 +124,12 @@ HRESULT WINAPI WindowsCreateStringReference(LPCWSTR ptr, UINT32 len,
}
if (ptr == NULL)
return E_POINTER;
priv->buffer = (LPWSTR)ptr;
priv->length = len;
priv->reference = TRUE;
*out = (HSTRING)header;
priv->header.flags = HSTRING_REFERENCE_FLAG;
*out = (HSTRING)priv;
return S_OK;
}
@ -133,7 +144,7 @@ HRESULT WINAPI WindowsDeleteString(HSTRING str)
if (str == NULL)
return S_OK;
if (priv->reference)
if (priv->header.flags & HSTRING_REFERENCE_FLAG)
return S_OK;
if (InterlockedDecrement(&priv->refcount) == 0)
HeapFree(GetProcessHeap(), 0, priv);
@ -156,7 +167,7 @@ HRESULT WINAPI WindowsDuplicateString(HSTRING str, HSTRING *out)
*out = NULL;
return S_OK;
}
if (priv->reference)
if (priv->header.flags & HSTRING_REFERENCE_FLAG)
return WindowsCreateString(priv->buffer, priv->length, out);
InterlockedIncrement(&priv->refcount);
*out = str;
@ -187,7 +198,7 @@ HRESULT WINAPI WindowsPreallocateStringBuffer(UINT32 len, WCHAR **outptr,
return E_OUTOFMEMORY;
priv = impl_from_HSTRING(str);
*outptr = priv->buffer;
*out = (HSTRING_BUFFER)str;
*out = (HSTRING_BUFFER)&priv->buffer;
return S_OK;
}
@ -196,9 +207,14 @@ HRESULT WINAPI WindowsPreallocateStringBuffer(UINT32 len, WCHAR **outptr,
*/
HRESULT WINAPI WindowsDeleteStringBuffer(HSTRING_BUFFER buf)
{
struct hstring_private *priv = NULL;
TRACE("(%p)\n", buf);
return WindowsDeleteString((HSTRING)buf);
if(buf)
priv = impl_from_HSTRING_BUFFER(buf);
return WindowsDeleteString((HSTRING)priv);
}
/***********************************************************************
@ -217,9 +233,9 @@ HRESULT WINAPI WindowsPromoteStringBuffer(HSTRING_BUFFER buf, HSTRING *out)
*out = NULL;
return S_OK;
}
if (priv->buffer[priv->length] != 0 || priv->reference || priv->refcount != 1)
if (priv->buffer[priv->length] != 0 || priv->header.flags & HSTRING_REFERENCE_FLAG || priv->refcount != 1)
return E_INVALIDARG;
*out = (HSTRING)buf;
*out = (HSTRING)priv;
return S_OK;
}

2
dlls/combase/tests/string.c
View file

@ -511,7 +511,6 @@ static void test_hstring_struct(void)
prv = CONTAINING_RECORD(str, struct hstring_private, header);
todo_wine
ok(prv->header.flags == 0, "Expected 0 in flags field, got %#x.\n", prv->header.flags);
todo_wine
ok(prv->header.str == prv->buffer, "Expected str to point at buffer, instead pointing at %p.\n", prv->header.str);
@ -546,7 +545,6 @@ static void test_hstring_struct(void)
prv2 = CONTAINING_RECORD(str, struct hstring_private, header);
ok(prv == prv2, "Pointers not identical.\n");
todo_wine
ok(prv2->header.flags == 1, "Expected HSTRING_REFERENCE_FLAG to be set, got %#x.\n", prv2->header.flags);
todo_wine
ok(prv2->header.str == input_string, "Expected str to point at input_string, instead pointing at %p.\n", prv2->header.str);