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- Start implementing RtlFindUnicodePrefix

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- Add case-insensitive compare to CompareUnicodeStrings

svn path=/trunk/; revision=19050
This commit is contained in:
Alex Ionescu 2005-11-07 23:52:26 +00:00
parent c7e90a00b9
commit e2fb011447
1 changed files with 68 additions and 3 deletions
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71
reactos/lib/rtl/unicodeprefix.c
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@ -57,6 +57,7 @@ CompareUnicodeStrings(IN PUNICODE_STRING String,
ULONG ScanLength = min(StringLength, PrefixLength);
ULONG i;
WCHAR FoundPrefix, FoundString;
PWCHAR p, p1;
/* Validate the Case Check Character Position */
if (CaseCheckChar > ScanLength) CaseCheckChar = ScanLength;
@ -75,7 +76,29 @@ CompareUnicodeStrings(IN PUNICODE_STRING String,
/* Check if we exausted the search above */
if (i == CaseCheckChar)
{
/* FIXME: Do a case-insensitive search */
/* Do a case-insensitive search */
p = &Prefix->Buffer[i];
p1 = &String->Buffer[i];
do
{
/* Move to the next character */
FoundPrefix = *p++;
FoundString = *p1++;
/* Compare it */
if (FoundPrefix != FoundString)
{
/* Upcase the characters */
FoundPrefix = RtlUpcaseUnicodeChar(FoundPrefix);
FoundString = RtlUpcaseUnicodeChar(FoundString);
/* Compare them again */
if (FoundPrefix != FoundString) break;
}
/* Move to the next char */
i++;
} while (i < ScanLength);
}
/* Check if we weren't able to find a match in the loops */
@ -120,8 +143,50 @@ RtlFindUnicodePrefix(PUNICODE_PREFIX_TABLE PrefixTable,
PUNICODE_STRING FullName,
ULONG CaseInsensitiveIndex)
{
UNIMPLEMENTED;
return 0;
ULONG NameCount;
PUNICODE_PREFIX_TABLE_ENTRY CurrentEntry, PreviousEntry;
PRTL_SPLAY_LINKS SplayLinks;
/* Find out how many names there are */
NameCount = ComputeUnicodeNameLength(FullName);
/* Find the right spot where to start looking for this entry */
PreviousEntry = (PUNICODE_PREFIX_TABLE_ENTRY)PrefixTable;
CurrentEntry = PreviousEntry->NextPrefixTree;
while (CurrentEntry->NameLength > NameCount)
{
/* Not a match, move to the next entry */
PreviousEntry = CurrentEntry;
CurrentEntry = CurrentEntry->NextPrefixTree;
}
/* Loop every entry which has valid entries */
while (CurrentEntry->NameLength)
{
/* Get the splay links and loop */
while ((SplayLinks = &CurrentEntry->Links))
{
/*
* Implementation notes:
* - get the entry
* - compare the entry's prefix with the fullname:
* if greater: restart on the left child
* if lesser: restart on the right child
* - else if equal:
* for caseinsensitive, just return the entry and
* splay it and set it as root if it's a child
* for casesensitive, loop the circular case match list and
* keep comparing for each entry
*/
}
/* Splay links exausted, move to next entry */
PreviousEntry = CurrentEntry;
CurrentEntry = CurrentEntry->NextPrefixTree;
}
/* If we got here, nothing was found */
return NULL;
}
/*