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windows-nt/Source/XPSP1/NT/base/screg/winreg/client/regeval.c

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/*++
Copyright (c) 1992 Microsoft Corporation
Module Name:
Regeval.c
Abstract:
This module contains the client side wrappers for the Win32 Registry
enumerate value APIs. That is:
- RegEnumValueExA
- RegEnumValueExW
Author:
David J. Gilman (davegi) 18-Mar-1992
Notes:
See the notes in server\regeval.c.
--*/
#include <rpc.h>
#include "regrpc.h"
#include "client.h"
LONG
RegEnumValueA (
HKEY hKey,
DWORD dwIndex,
LPSTR lpValueName,
LPDWORD lpcbValueName,
LPDWORD lpReserved,
LPDWORD lpType,
LPBYTE lpData,
LPDWORD lpcbData
)
/*++
Routine Description:
Win32 ANSI RPC wrapper for enumerating values.
--*/
{
UNICODE_STRING Name;
ANSI_STRING AnsiString;
NTSTATUS Status;
LONG Error = ERROR_SUCCESS;
DWORD ValueType;
DWORD ValueLength;
DWORD InputLength;
PWSTR UnicodeValueBuffer;
ULONG UnicodeValueLength;
PSTR AnsiValueBuffer;
ULONG AnsiValueLength;
ULONG Index;
BOOLEAN Win95Server = FALSE;
ULONG cbAnsi = 0;
HKEY TempHandle = NULL;
#if DBG
if ( BreakPointOnEntry ) {
DbgBreakPoint();
}
#endif
//
// Validate dependency between lpData and lpcbData parameters.
//
if( ARGUMENT_PRESENT( lpReserved ) ||
(ARGUMENT_PRESENT( lpData ) && ( ! ARGUMENT_PRESENT( lpcbData ))) ||
(!ARGUMENT_PRESENT(lpcbValueName)) || (!ARGUMENT_PRESENT(lpValueName)) ) {
return ERROR_INVALID_PARAMETER;
}
hKey = MapPredefinedHandle( hKey, &TempHandle );
if( hKey == NULL ) {
Error = ERROR_INVALID_HANDLE;
goto ExitCleanup;
}
//
// Allocate temporary buffer for the Name
//
Name.Length = 0;
Name.MaximumLength = (USHORT)((*lpcbValueName + 1) * sizeof( WCHAR ));
Name.Buffer = RtlAllocateHeap( RtlProcessHeap(), 0, Name.MaximumLength );
if( Name.Buffer == NULL ) {
Error = ERROR_NOT_ENOUGH_MEMORY;
goto ExitCleanup;
}
//
// Call the Base API passing it a pointer to the counted Unicode
// strings for the value name. Note that zero bytes are transmitted (i.e.
// InputLength = 0) for the data.
//
if (ARGUMENT_PRESENT( lpcbData )) {
ValueLength = *lpcbData;
}
else {
ValueLength = 0;
}
InputLength = 0;
if( IsLocalHandle( hKey )) {
Error = (LONG)LocalBaseRegEnumValue (
hKey,
dwIndex,
&Name,
&ValueType,
lpData,
&ValueLength,
&InputLength
);
ASSERT( Name.Buffer );
} else {
DWORD dwVersion;
//
// Check for a downlevel Win95 server, which requires
// us to work around their BaseRegEnumValue bugs.
// The returned ValueLength is one WCHAR too large AND
// they trash two bytes beyond the end of the buffer
// for REG_SZ, REG_MULTI_SZ, and REG_EXPAND_SZ
//
Win95Server = IsWin95Server(DereferenceRemoteHandle(hKey),dwVersion);
if (Win95Server) {
LPBYTE lpWin95Data;
//
// This is a Win95 server.
// Allocate a new buffer that is two bytes larger than
// the old one so they can trash the last two bytes.
//
lpWin95Data = RtlAllocateHeap(RtlProcessHeap(),
0,
ValueLength+sizeof(WCHAR));
if (lpWin95Data == NULL) {
Error = ERROR_NOT_ENOUGH_MEMORY;
} else {
Error = (LONG)BaseRegEnumValue (DereferenceRemoteHandle( hKey ),
dwIndex,
&Name,
&ValueType,
lpWin95Data,
&ValueLength,
&InputLength);
if (Error == ERROR_SUCCESS) {
if ((ValueType == REG_SZ) ||
(ValueType == REG_MULTI_SZ) ||
(ValueType == REG_EXPAND_SZ)) {
//
// The returned length is one WCHAR too large
// and the last two bytes of the buffer are trashed.
//
ValueLength -= sizeof(WCHAR);
}
CopyMemory(lpData, lpWin95Data, ValueLength);
}
RtlFreeHeap(RtlProcessHeap(),0,lpWin95Data);
}
} else {
Error = (LONG)BaseRegEnumValue (DereferenceRemoteHandle( hKey ),
dwIndex,
&Name,
&ValueType,
lpData,
&ValueLength,
&InputLength);
}
}
//
// If no error or callers buffer too small, and type is one of the null
// terminated string types, then do the UNICODE to ANSI translation.
// We handle the buffer too small case, because the callers buffer may
// be big enough for the ANSI representation, but not the UNICODE one.
// In this case, we need to allocate a buffer big enough, do the query
// again and then the translation into the callers buffer.
//
if ((Error == ERROR_SUCCESS || Error == ERROR_MORE_DATA) &&
ARGUMENT_PRESENT( lpcbData ) &&
(ValueType == REG_SZ ||
ValueType == REG_EXPAND_SZ ||
ValueType == REG_MULTI_SZ)
) {
UnicodeValueLength = ValueLength;
AnsiValueBuffer = lpData;
AnsiValueLength = ARGUMENT_PRESENT( lpcbData )? *lpcbData : 0;
//
// Allocate a buffer for the UNICODE value and reissue the query.
//
UnicodeValueBuffer = RtlAllocateHeap( RtlProcessHeap(), 0,
UnicodeValueLength
);
if (UnicodeValueBuffer == NULL) {
Error = ERROR_NOT_ENOUGH_MEMORY;
} else {
InputLength = 0;
if( IsLocalHandle( hKey )) {
Error = (LONG)LocalBaseRegEnumValue (
hKey,
dwIndex,
&Name,
&ValueType,
(LPBYTE)UnicodeValueBuffer,
&ValueLength,
&InputLength
);
//
// Make sure that the local side didn't destroy the
// Buffer in the Name
//
ASSERT(Name.Buffer);
} else {
if (Win95Server) {
LPBYTE lpWin95Data;
//
// This is a Win95 server.
// Allocate a new buffer that is two bytes larger than
// the old one so they can trash the last two bytes.
//
lpWin95Data = RtlAllocateHeap(RtlProcessHeap(),
0,
ValueLength+sizeof(WCHAR));
if (lpWin95Data == NULL) {
Error = ERROR_NOT_ENOUGH_MEMORY;
} else {
Error = (LONG)BaseRegEnumValue (DereferenceRemoteHandle( hKey ),
dwIndex,
&Name,
&ValueType,
lpWin95Data,
&ValueLength,
&InputLength);
if (Error == ERROR_SUCCESS) {
if ((ValueType == REG_SZ) ||
(ValueType == REG_MULTI_SZ) ||
(ValueType == REG_EXPAND_SZ)) {
//
// The returned length is one WCHAR too large
// and the last two bytes of the buffer are trashed.
//
ValueLength -= sizeof(WCHAR);
}
CopyMemory(UnicodeValueBuffer, lpWin95Data, ValueLength);
}
RtlFreeHeap(RtlProcessHeap(),0,lpWin95Data);
}
} else {
Error = (LONG)BaseRegEnumValue (DereferenceRemoteHandle( hKey ),
dwIndex,
&Name,
&ValueType,
(LPBYTE)UnicodeValueBuffer,
&ValueLength,
&InputLength);
}
}
// Compute needed buffer size , cbAnsi will keeps the byte
// counts to keep MBCS string after following step.
RtlUnicodeToMultiByteSize( &cbAnsi ,
UnicodeValueBuffer ,
ValueLength );
// If we could not store all MBCS string to buffer that
// Apps gives me. We set ERROR_MORE_DATA to Error
if( ARGUMENT_PRESENT( lpcbData ) ) {
if( cbAnsi > *lpcbData && lpData != NULL ) {
Error = ERROR_MORE_DATA;
}
}
}
if ((Error == ERROR_SUCCESS) && (AnsiValueBuffer != NULL)) {
//
// We have a UNICODE value, so translate it to ANSI in the callers
// buffer. In the case where the caller's buffer was big enough
// for the UNICODE version, we do the conversion in place, which
// works since the ANSI version is smaller than the UNICODE version.
//
Index = 0;
Status = RtlUnicodeToMultiByteN( AnsiValueBuffer,
AnsiValueLength,
&Index,
UnicodeValueBuffer,
UnicodeValueLength
);
if (!NT_SUCCESS( Status )) {
Error = RtlNtStatusToDosError( Status );
}
cbAnsi = Index;
}
//
// Free the unicode buffer if it was successfully allocated
//
if (UnicodeValueBuffer != NULL) {
RtlFreeHeap( RtlProcessHeap(), 0, UnicodeValueBuffer );
}
//
// Return the length of the ANSI version to the caller.
//
ValueLength = cbAnsi;
//
// Special hack to help out all the peopl who
// believe the length of a NULL terminated string is
// strlen(foo) instead of strlen(foo) + 1.
// If the last character of the buffer is not a NULL
// and there is enough space left in the caller's buffer,
// slap a NULL in there to prevent him from going nuts
// trying to do a strlen().
//
if (ARGUMENT_PRESENT( lpData ) &&
(*lpcbData > ValueLength) &&
(ValueLength > 0) &&
(lpData[ValueLength-1] != '\0')) {
lpData[ValueLength] = '\0';
}
}
//
// Return the value type and data length if requested and we have it.
//
if (Error == ERROR_SUCCESS || Error == ERROR_MORE_DATA) {
if (lpcbData != NULL) {
*lpcbData = ValueLength;
}
if (lpType != NULL) {
*lpType = ValueType;
}
}
//
// If the information was not succesfully queried return the error.
//
if( Error != ERROR_SUCCESS ) {
// free allocated buffer
RtlFreeHeap( RtlProcessHeap(), 0, Name.Buffer );
goto ExitCleanup;
}
//
// Subtract the NULL from the Length. This was added by the server
// so that RPC would transmit it.
//
if ( Name.Length > 0 ) {
Name.Length -= sizeof( UNICODE_NULL );
}
//
// Convert the name to ANSI.
//
AnsiString.MaximumLength = ( USHORT ) *lpcbValueName;
AnsiString.Buffer = lpValueName;
Status = RtlUnicodeStringToAnsiString(
&AnsiString,
&Name,
FALSE
);
// free allocated buffer
RtlFreeHeap( RtlProcessHeap(), 0, Name.Buffer );
//
// If the name conversion failed, map and return the error.
//
if( ! NT_SUCCESS( Status )) {
Error = RtlNtStatusToDosError( Status );
goto ExitCleanup;
}
//
// Update the name length return parameter.
//
*lpcbValueName = AnsiString.Length;
ExitCleanup:
CLOSE_LOCAL_HANDLE(TempHandle);
return Error;
}
LONG
RegEnumValueW (
HKEY hKey,
DWORD dwIndex,
LPWSTR lpValueName,
LPDWORD lpcbValueName,
LPDWORD lpReserved,
LPDWORD lpType,
LPBYTE lpData,
LPDWORD lpcbData
)
/*++
Routine Description:
Win32 Unicode RPC wrapper for enumerating values.
--*/
{
UNICODE_STRING Name;
LONG Error;
DWORD InputLength;
DWORD ValueLength;
DWORD ValueType;
HKEY TempHandle = NULL;
#if DBG
if ( BreakPointOnEntry ) {
DbgBreakPoint();
}
#endif
//
// Validate dependency between lpData and lpcbData parameters.
//
if( ARGUMENT_PRESENT( lpReserved ) ||
(ARGUMENT_PRESENT( lpData ) && ( ! ARGUMENT_PRESENT( lpcbData ))) ||
(!ARGUMENT_PRESENT(lpcbValueName)) || (!ARGUMENT_PRESENT(lpValueName)) ) {
return ERROR_INVALID_PARAMETER;
}
hKey = MapPredefinedHandle( hKey, &TempHandle );
if( hKey == NULL ) {
Error = ERROR_INVALID_HANDLE;
goto ExitCleanup;
}
Name.Length = 0;
Name.MaximumLength = ( USHORT )( *lpcbValueName << 1 );
Name.Buffer = lpValueName;
//
// Call the Base API passing it a pointer to the counted Unicode
// string for the name and return the results. Note that zero bytes
// are transmitted (i.e.InputLength = 0) for the data.
//
InputLength = 0;
ValueLength = ( ARGUMENT_PRESENT( lpcbData ) )? *lpcbData : 0;
if( IsLocalHandle( hKey )) {
Error = (LONG)LocalBaseRegEnumValue (
hKey,
dwIndex,
&Name,
&ValueType,
lpData,
&ValueLength,
&InputLength
);
} else {
DWORD dwVersion;
if (IsWin95Server(DereferenceRemoteHandle(hKey),dwVersion)) {
LPBYTE lpWin95Data;
//
// This is a Win95 server.
// Allocate a new buffer that is two bytes larger than
// the old one so they can trash the last two bytes.
//
lpWin95Data = RtlAllocateHeap(RtlProcessHeap(),
0,
ValueLength+sizeof(WCHAR));
if (lpWin95Data == NULL) {
Error = ERROR_NOT_ENOUGH_MEMORY;
goto ExitCleanup;
} else {
Error = (LONG)BaseRegEnumValue (DereferenceRemoteHandle( hKey ),
dwIndex,
&Name,
&ValueType,
lpWin95Data,
&ValueLength,
&InputLength);
if (Error == ERROR_SUCCESS) {
if ((ValueType == REG_SZ) ||
(ValueType == REG_MULTI_SZ) ||
(ValueType == REG_EXPAND_SZ)) {
//
// The returned length is one WCHAR too large
// and the last two bytes of the buffer are trashed.
//
ValueLength -= sizeof(WCHAR);
}
CopyMemory(lpData, lpWin95Data, ValueLength);
}
RtlFreeHeap(RtlProcessHeap(),0,lpWin95Data);
}
} else {
Error = (LONG)BaseRegEnumValue (DereferenceRemoteHandle( hKey ),
dwIndex,
&Name,
&ValueType,
lpData,
&ValueLength,
&InputLength);
}
}
//
// Special hack to help out all the people who
// believe the length of a NULL terminated string is
// strlen(foo) instead of strlen(foo) + 1.
// If the last character of the buffer is not a NULL
// and there is enough space left in the caller's buffer,
// slap a NULL in there to prevent him from going nuts
// trying to do a strlen().
//
if ( (Error == ERROR_SUCCESS) &&
ARGUMENT_PRESENT( lpData ) &&
( (ValueType == REG_SZ) ||
(ValueType == REG_EXPAND_SZ) ||
(ValueType == REG_MULTI_SZ)) &&
( ValueLength > sizeof(WCHAR))) {
UNALIGNED WCHAR *String = (UNALIGNED WCHAR *)lpData;
DWORD Length = ValueLength/sizeof(WCHAR);
if ((String[Length-1] != UNICODE_NULL) &&
(ValueLength+sizeof(WCHAR) <= *lpcbData)) {
String[Length] = UNICODE_NULL;
}
}
//
// Don't count the NUL.
//
if( Name.Length != 0 ) {
*lpcbValueName = ( Name.Length >> 1 ) - 1;
}
if( ARGUMENT_PRESENT( lpcbData ) ) {
*lpcbData = ValueLength;
}
if ( ARGUMENT_PRESENT( lpType )) {
*lpType = ValueType;
}
ExitCleanup:
CLOSE_LOCAL_HANDLE(TempHandle);
return Error;
}
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