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Port RegGetValue() from WINE

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patch by Thomas Weidenmueller


svn path=/trunk/; revision=22491
This commit is contained in:
Ged Murphy 2006-06-21 21:19:47 +00:00
parent 6c16a39783
commit 2747b47c79
2 changed files with 254 additions and 0 deletions
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2
reactos/dll/win32/advapi32/advapi32.def
View file

@ -494,6 +494,8 @@ RegEnumValueA@32
RegEnumValueW@32
RegFlushKey@4
RegGetKeySecurity@16
RegGetValueA@28
RegGetValueW@28
RegLoadKeyA@12
RegLoadKeyW@12
RegLoadMUIStringA@24

252
reactos/dll/win32/advapi32/reg/reg.c
View file

@ -1680,6 +1680,258 @@ RegEnableReflectionKey(IN HKEY hBase)
return ERROR_CALL_NOT_IMPLEMENTED;
}
/******************************************************************************
* RegpApplyRestrictions [internal]
*
* Helper function for RegGetValueA/W.
*/
static VOID
RegpApplyRestrictions( DWORD dwFlags, DWORD dwType, DWORD cbData,
PLONG ret )
{
/* Check if the type is restricted by the passed flags */
if (*ret == ERROR_SUCCESS || *ret == ERROR_MORE_DATA)
{
DWORD dwMask = 0;
switch (dwType)
{
case REG_NONE: dwMask = RRF_RT_REG_NONE; break;
case REG_SZ: dwMask = RRF_RT_REG_SZ; break;
case REG_EXPAND_SZ: dwMask = RRF_RT_REG_EXPAND_SZ; break;
case REG_MULTI_SZ: dwMask = RRF_RT_REG_MULTI_SZ; break;
case REG_BINARY: dwMask = RRF_RT_REG_BINARY; break;
case REG_DWORD: dwMask = RRF_RT_REG_DWORD; break;
case REG_QWORD: dwMask = RRF_RT_REG_QWORD; break;
}
if (dwFlags & dwMask)
{
/* Type is not restricted, check for size mismatch */
if (dwType == REG_BINARY)
{
DWORD cbExpect = 0;
if ((dwFlags & RRF_RT_DWORD) == RRF_RT_DWORD)
cbExpect = 4;
else if ((dwFlags & RRF_RT_DWORD) == RRF_RT_QWORD)
cbExpect = 8;
if (cbExpect && cbData != cbExpect)
*ret = ERROR_DATATYPE_MISMATCH;
}
}
else *ret = ERROR_UNSUPPORTED_TYPE;
}
}
/******************************************************************************
* RegGetValueW [ADVAPI32.@]
*
* Retrieves the type and data for a value name associated with a key
* optionally expanding it's content and restricting it's type.
*
* PARAMS
* hKey [I] Handle to an open key.
* pszSubKey [I] Name of the subkey of hKey.
* pszValue [I] Name of value under hKey/szSubKey to query.
* dwFlags [I] Flags restricting the value type to retrieve.
* pdwType [O] Destination for the values type, may be NULL.
* pvData [O] Destination for the values content, may be NULL.
* pcbData [I/O] Size of pvData, updated with the size required to
* retrieve the whole content.
*
* RETURNS
* Success: ERROR_SUCCESS
* Failure: nonzero error code from Winerror.h
*
* NOTES
* - Unless RRF_NOEXPAND is specified REG_EXPAND_SZ is automatically expanded
* and REG_SZ is retrieved instead.
* - Restrictions are applied after expanding, using RRF_RT_REG_EXPAND_SZ
* without RRF_NOEXPAND is thus not allowed.
*/
LONG WINAPI
RegGetValueW( HKEY hKey, LPCWSTR pszSubKey, LPCWSTR pszValue,
DWORD dwFlags, LPDWORD pdwType, PVOID pvData,
LPDWORD pcbData )
{
DWORD dwType, cbData = pcbData ? *pcbData : 0;
PVOID pvBuf = NULL;
LONG ret;
TRACE("(%p,%s,%s,%ld,%p,%p,%p=%ld)\n",
hKey, debugstr_w(pszSubKey), debugstr_w(pszValue), dwFlags, pdwType,
pvData, pcbData, cbData);
if ((dwFlags & RRF_RT_REG_EXPAND_SZ) && !(dwFlags & RRF_NOEXPAND))
return ERROR_INVALID_PARAMETER;
if (pszSubKey && pszSubKey[0])
{
ret = RegOpenKeyExW(hKey, pszSubKey, 0, KEY_QUERY_VALUE, &hKey);
if (ret != ERROR_SUCCESS) return ret;
}
ret = RegQueryValueExW(hKey, pszValue, NULL, &dwType, pvData, &cbData);
/* If we are going to expand we need to read in the whole the value even
* if the passed buffer was too small as the expanded string might be
* smaller than the unexpanded one and could fit into cbData bytes. */
if ((ret == ERROR_SUCCESS || ret == ERROR_MORE_DATA) &&
(dwType == REG_EXPAND_SZ && !(dwFlags & RRF_NOEXPAND)))
{
do {
if (pvBuf) HeapFree(GetProcessHeap(), 0, pvBuf);
pvBuf = HeapAlloc(GetProcessHeap(), 0, cbData);
if (!pvBuf)
{
ret = ERROR_NOT_ENOUGH_MEMORY;
break;
}
if (ret == ERROR_MORE_DATA)
ret = RegQueryValueExW(hKey, pszValue, NULL,
&dwType, pvBuf, &cbData);
else
{
/* Even if cbData was large enough we have to copy the
* string since ExpandEnvironmentStrings can't handle
* overlapping buffers. */
CopyMemory(pvBuf, pvData, cbData);
}
/* Both the type or the value itself could have been modified in
* between so we have to keep retrying until the buffer is large
* enough or we no longer have to expand the value. */
} while (dwType == REG_EXPAND_SZ && ret == ERROR_MORE_DATA);
if (ret == ERROR_SUCCESS)
{
if (dwType == REG_EXPAND_SZ)
{
cbData = ExpandEnvironmentStringsW(pvBuf, pvData,
pcbData ? *pcbData : 0);
dwType = REG_SZ;
if(pcbData && cbData > *pcbData)
ret = ERROR_MORE_DATA;
}
else if (pcbData)
CopyMemory(pvData, pvBuf, *pcbData);
}
if (pvBuf) HeapFree(GetProcessHeap(), 0, pvBuf);
}
if (pszSubKey && pszSubKey[0])
RegCloseKey(hKey);
RegpApplyRestrictions(dwFlags, dwType, cbData, &ret);
if (pcbData && ret != ERROR_SUCCESS && (dwFlags & RRF_ZEROONFAILURE))
ZeroMemory(pvData, *pcbData);
if (pdwType) *pdwType = dwType;
if (pcbData) *pcbData = cbData;
return ret;
}
/******************************************************************************
* RegGetValueA [ADVAPI32.@]
*
* See RegGetValueW.
*/
LONG WINAPI
RegGetValueA( HKEY hKey, LPCSTR pszSubKey, LPCSTR pszValue,
DWORD dwFlags, LPDWORD pdwType, PVOID pvData,
LPDWORD pcbData )
{
DWORD dwType, cbData = pcbData ? *pcbData : 0;
PVOID pvBuf = NULL;
LONG ret;
TRACE("(%p,%s,%s,%ld,%p,%p,%p=%ld)\n",
hKey, pszSubKey, pszValue, dwFlags, pdwType, pvData, pcbData,
cbData);
if ((dwFlags & RRF_RT_REG_EXPAND_SZ) && !(dwFlags & RRF_NOEXPAND))
return ERROR_INVALID_PARAMETER;
if (pszSubKey && pszSubKey[0])
{
ret = RegOpenKeyExA(hKey, pszSubKey, 0, KEY_QUERY_VALUE, &hKey);
if (ret != ERROR_SUCCESS) return ret;
}
ret = RegQueryValueExA(hKey, pszValue, NULL, &dwType, pvData, &cbData);
/* If we are going to expand we need to read in the whole the value even
* if the passed buffer was too small as the expanded string might be
* smaller than the unexpanded one and could fit into cbData bytes. */
if ((ret == ERROR_SUCCESS || ret == ERROR_MORE_DATA) &&
(dwType == REG_EXPAND_SZ && !(dwFlags & RRF_NOEXPAND)))
{
do {
if (pvBuf) HeapFree(GetProcessHeap(), 0, pvBuf);
pvBuf = HeapAlloc(GetProcessHeap(), 0, cbData);
if (!pvBuf)
{
ret = ERROR_NOT_ENOUGH_MEMORY;
break;
}
if (ret == ERROR_MORE_DATA)
ret = RegQueryValueExA(hKey, pszValue, NULL,
&dwType, pvBuf, &cbData);
else
{
/* Even if cbData was large enough we have to copy the
* string since ExpandEnvironmentStrings can't handle
* overlapping buffers. */
CopyMemory(pvBuf, pvData, cbData);
}
/* Both the type or the value itself could have been modified in
* between so we have to keep retrying until the buffer is large
* enough or we no longer have to expand the value. */
} while (dwType == REG_EXPAND_SZ && ret == ERROR_MORE_DATA);
if (ret == ERROR_SUCCESS)
{
if (dwType == REG_EXPAND_SZ)
{
cbData = ExpandEnvironmentStringsA(pvBuf, pvData,
pcbData ? *pcbData : 0);
dwType = REG_SZ;
if(pcbData && cbData > *pcbData)
ret = ERROR_MORE_DATA;
}
else if (pcbData)
CopyMemory(pvData, pvBuf, *pcbData);
}
if (pvBuf) HeapFree(GetProcessHeap(), 0, pvBuf);
}
if (pszSubKey && pszSubKey[0])
RegCloseKey(hKey);
RegpApplyRestrictions(dwFlags, dwType, cbData, &ret);
if (pcbData && ret != ERROR_SUCCESS && (dwFlags & RRF_ZEROONFAILURE))
ZeroMemory(pvData, *pcbData);
if (pdwType) *pdwType = dwType;
if (pcbData) *pcbData = cbData;
return ret;
}
/************************************************************************
* RegSetKeyValueW