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- Finish implementing RtlFindUnicodePrefix. The Windows NPFS driver should load now (unless it needs other APIs..)

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svn path=/trunk/; revision=19051
This commit is contained in:
Alex Ionescu 2005-11-08 00:19:01 +00:00
parent e2fb011447
commit d2a199261e
1 changed files with 88 additions and 2 deletions
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90
reactos/lib/rtl/unicodeprefix.c
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@ -135,7 +135,7 @@ CompareUnicodeStrings(IN PUNICODE_STRING String,
}
/*
* @unimplemented
* @implemented
*/
PUNICODE_PREFIX_TABLE_ENTRY
NTAPI
@ -144,8 +144,9 @@ RtlFindUnicodePrefix(PUNICODE_PREFIX_TABLE PrefixTable,
ULONG CaseInsensitiveIndex)
{
ULONG NameCount;
PUNICODE_PREFIX_TABLE_ENTRY CurrentEntry, PreviousEntry;
PUNICODE_PREFIX_TABLE_ENTRY CurrentEntry, PreviousEntry, Entry, NextEntry;
PRTL_SPLAY_LINKS SplayLinks;
RTL_GENERIC_COMPARE_RESULTS Result;
/* Find out how many names there are */
NameCount = ComputeUnicodeNameLength(FullName);
@ -178,6 +179,91 @@ RtlFindUnicodePrefix(PUNICODE_PREFIX_TABLE PrefixTable,
* for casesensitive, loop the circular case match list and
* keep comparing for each entry
*/
Entry = CONTAINING_RECORD(SplayLinks,
UNICODE_PREFIX_TABLE_ENTRY,
Links);
/* Do the comparison */
Result = CompareUnicodeStrings(Entry->Prefix, FullName, 0);
if (Result == GenericGreaterThan)
{
/* Prefix is greater, so restart on the left child */
SplayLinks = RtlLeftChild(SplayLinks);
continue;
}
else if (Result == GenericLessThan)
{
/* Prefix is smaller, so restart on the right child */
SplayLinks = RtlRightChild(SplayLinks);
continue;
}
/*
* We have a match, check if this was a case-sensitive search
* NOTE: An index of 0 means case-insensitive(ie, we'll be case
* insensitive since index 0, ie, all the time)
*/
if (!CaseInsensitiveIndex)
{
/*
* Check if this entry was a child. We need to return the root,
* so if this entry was a child, we'll splay the tree and get
* the root, and set the current entry as a child.
*/
if (Entry->NodeTypeCode == PFX_NTC_CHILD)
{
/* Get the next entry */
NextEntry = CurrentEntry->NextPrefixTree;
/* Make the current entry become a child */
CurrentEntry->NodeTypeCode = PFX_NTC_CHILD;
CurrentEntry->NextPrefixTree = NULL;
/* Splay the tree */
SplayLinks = RtlSplay(&Entry->Links);
/* Get the new root entry */
Entry = CONTAINING_RECORD(SplayLinks,
UNICODE_PREFIX_TABLE_ENTRY,
Links);
/* Set it as a root entry */
Entry->NodeTypeCode = PFX_NTC_ROOT;
/* Add it to the root entries list */
PreviousEntry->NextPrefixTree = Entry;
Entry->NextPrefixTree = NextEntry;
}
/* Return the entry */
return Entry;
}
/* We'll do a case-sensitive search if we've reached this point */
NextEntry = Entry;
do
{
/* Do the case-sensitive search */
Result = CompareUnicodeStrings(NextEntry->Prefix,
FullName,
CaseInsensitiveIndex);
if ((Result != GenericLessThan) &&
(Result != GenericGreaterThan))
{
/* This is a positive match, return it */
return NextEntry;
}
/* No match yet, continue looping the circular list */
NextEntry = NextEntry->CaseMatch;
} while (NextEntry != Entry);
/*
* If we got here, then we found a non-case-sensitive match, but
* we need to find a case-sensitive match, so we'll just keep
* searching the next tree (NOTE: we need to break out for this).
*/
break;
}
/* Splay links exausted, move to next entry */