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combase: Add padding and string reference pointer to hstring_header. 

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 16:09:22 +01:00 committed by Alexandre Julliard
parent f7609ac2e6
commit 369e4e3609
2 changed files with 18 additions and 15 deletions
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32
dlls/combase/string.c
View File

@ -32,6 +32,9 @@ struct hstring_header
{
UINT32 flags;
UINT32 length;
UINT32 padding1;
UINT32 padding2;
const WCHAR *str;
};
struct hstring_private
@ -70,6 +73,7 @@ static BOOL alloc_string(UINT32 len, HSTRING *out)
priv->header.flags = 0;
priv->buffer = (LPWSTR)(priv + 1);
priv->header.length = len;
priv->header.str = priv->buffer;
priv->refcount = 1;
priv->buffer[len] = '\0';
@ -125,7 +129,7 @@ HRESULT WINAPI WindowsCreateStringReference(LPCWSTR ptr, UINT32 len,
if (ptr == NULL)
return E_POINTER;
priv->buffer = (LPWSTR)ptr;
priv->header.str = ptr;
priv->header.length = len;
priv->header.flags = HSTRING_REFERENCE_FLAG;
@ -168,7 +172,7 @@ HRESULT WINAPI WindowsDuplicateString(HSTRING str, HSTRING *out)
return S_OK;
}
if (priv->header.flags & HSTRING_REFERENCE_FLAG)
return WindowsCreateString(priv->buffer, priv->header.length, out);
return WindowsCreateString(priv->header.str, priv->header.length, out);
InterlockedIncrement(&priv->refcount);
*out = str;
return S_OK;
@ -270,7 +274,7 @@ LPCWSTR WINAPI WindowsGetStringRawBuffer(HSTRING str, UINT32 *len)
}
if (len)
*len = priv->header.length;
return priv->buffer;
return priv->header.str;
}
/***********************************************************************
@ -292,7 +296,7 @@ HRESULT WINAPI WindowsStringHasEmbeddedNull(HSTRING str, BOOL *out)
}
for (i = 0; i < priv->header.length; i++)
{
if (priv->buffer[i] == '\0')
if (priv->header.str[i] == '\0')
{
*out = TRUE;
return S_OK;
@ -321,7 +325,7 @@ HRESULT WINAPI WindowsSubstring(HSTRING str, UINT32 start, HSTRING *out)
*out = NULL;
return S_OK;
}
return WindowsCreateString(&priv->buffer[start], len - start, out);
return WindowsCreateString(&priv->header.str[start], len - start, out);
}
/***********************************************************************
@ -343,7 +347,7 @@ HRESULT WINAPI WindowsSubstringWithSpecifiedLength(HSTRING str, UINT32 start, UI
*out = NULL;
return S_OK;
}
return WindowsCreateString(&priv->buffer[start], len, out);
return WindowsCreateString(&priv->header.str[start], len, out);
}
/***********************************************************************
@ -371,8 +375,8 @@ HRESULT WINAPI WindowsConcatString(HSTRING str1, HSTRING str2, HSTRING *out)
if (!alloc_string(priv1->header.length + priv2->header.length, out))
return E_OUTOFMEMORY;
priv = impl_from_HSTRING(*out);
memcpy(priv->buffer, priv1->buffer, priv1->header.length * sizeof(*priv1->buffer));
memcpy(priv->buffer + priv1->header.length, priv2->buffer, priv2->header.length * sizeof(*priv2->buffer));
memcpy(priv->buffer, priv1->header.str, priv1->header.length * sizeof(*priv1->buffer));
memcpy(priv->buffer + priv1->header.length, priv2->header.str, priv2->header.length * sizeof(*priv2->buffer));
return S_OK;
}
@ -411,12 +415,12 @@ HRESULT WINAPI WindowsCompareStringOrdinal(HSTRING str1, HSTRING str2, INT32 *re
}
if (str1)
{
buf1 = priv1->buffer;
buf1 = priv1->header.str;
len1 = priv1->header.length;
}
if (str2)
{
buf2 = priv2->buffer;
buf2 = priv2->header.str;
len2 = priv2->header.length;
}
*res = CompareStringOrdinal(buf1, len1, buf2, len2, FALSE) - CSTR_EQUAL;
@ -443,10 +447,10 @@ HRESULT WINAPI WindowsTrimStringStart(HSTRING str1, HSTRING str2, HSTRING *out)
}
for (start = 0; start < priv1->header.length; start++)
{
if (!wmemchr(priv2->buffer, priv1->buffer[start], priv2->header.length))
if (!wmemchr(priv2->header.str, priv1->header.str[start], priv2->header.length))
break;
}
return start ? WindowsCreateString(&priv1->buffer[start], priv1->header.length - start, out) :
return start ? WindowsCreateString(&priv1->header.str[start], priv1->header.length - start, out) :
WindowsDuplicateString(str1, out);
}
@ -470,9 +474,9 @@ HRESULT WINAPI WindowsTrimStringEnd(HSTRING str1, HSTRING str2, HSTRING *out)
}
for (len = priv1->header.length; len > 0; len--)
{
if (!wmemchr(priv2->buffer, priv1->buffer[len - 1], priv2->header.length))
if (!wmemchr(priv2->header.str, priv1->header.str[len - 1], priv2->header.length))
break;
}
return (len < priv1->header.length) ? WindowsCreateString(priv1->buffer, len, out) :
return (len < priv1->header.length) ? WindowsCreateString(priv1->header.str, len, out) :
WindowsDuplicateString(str1, out);
}

1
dlls/combase/tests/string.c
View File

@ -548,7 +548,6 @@ static void test_hstring_struct(void)
ok(prv == prv2, "Pointers not identical.\n");
ok(prv2->header.flags == 1, "Expected HSTRING_REFERENCE_FLAG to be set, got %#x.\n", prv2->header.flags);
ok(prv2->header.length == 6, "Expected 6 in length field, got %u.\n", prv2->header.length);
todo_wine
ok(prv2->header.str == input_string, "Expected str to point at input_string, instead pointing at %p.\n", prv2->header.str);
ok(WindowsDeleteString(str) == S_OK, "Failed to delete string ref.\n");