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reactos/sdk/lib/cmlib/cmindex.c
Serge Gautherie fb48381cb4
[CMLIB] Simplify an ASSERTMSG() as an ASSERT().
2018-08-08 21:45:46 +02:00

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/*
* PROJECT: ReactOS Registry Library
* LICENSE: GPL - See COPYING in the top level directory
* FILE: lib/cmlib/cmindex.c
* PURPOSE: Configuration Manager - Cell Indexes
* PROGRAMMERS: Alex Ionescu (alex.ionescu@reactos.org)
*/
/* INCLUDES ******************************************************************/
#include "cmlib.h"
#define NDEBUG
#include <debug.h>
/* GLOBALS *******************************************************************/
#define INVALID_INDEX 0x80000000
#define CmpMaxFastIndexPerHblock \
((HBLOCK_SIZE - (sizeof(HBIN) + sizeof(HCELL) + \
FIELD_OFFSET(CM_KEY_FAST_INDEX, List))) / sizeof(CM_INDEX))
#define CmpMaxIndexPerHblock \
((HBLOCK_SIZE - (sizeof(HBIN) + sizeof(HCELL) + \
FIELD_OFFSET(CM_KEY_INDEX, List))) / sizeof(HCELL_INDEX) - 1)
/* FUNCTIONS *****************************************************************/
LONG
NTAPI
CmpDoCompareKeyName(IN PHHIVE Hive,
IN PCUNICODE_STRING SearchName,
IN HCELL_INDEX Cell)
{
PCM_KEY_NODE Node;
UNICODE_STRING KeyName;
LONG Result;
/* Get the node */
Node = (PCM_KEY_NODE)HvGetCell(Hive, Cell);
if (!Node) return 2;
/* Check if it's compressed */
if (Node->Flags & KEY_COMP_NAME)
{
/* Compare compressed names */
Result = CmpCompareCompressedName(SearchName,
Node->Name,
Node->NameLength);
}
else
{
/* Compare the Unicode name directly */
KeyName.Buffer = Node->Name;
KeyName.Length = Node->NameLength;
KeyName.MaximumLength = KeyName.Length;
Result = RtlCompareUnicodeString(SearchName, &KeyName, TRUE);
}
/* Release the cell and return the normalized result */
HvReleaseCell(Hive, Cell);
return (Result == 0) ? Result : ((Result > 0) ? 1 : -1);
}
LONG
NTAPI
CmpCompareInIndex(IN PHHIVE Hive,
IN PCUNICODE_STRING SearchName,
IN ULONG Count,
IN PCM_KEY_INDEX Index,
IN PHCELL_INDEX SubKey)
{
PCM_KEY_FAST_INDEX FastIndex;
PCM_INDEX FastEntry;
LONG Result;
ULONG i;
ULONG ActualNameLength = 4, CompareLength, NameLength;
WCHAR p, pp;
/* Assume failure */
*SubKey = HCELL_NIL;
/* Check if we are a fast or hashed leaf */
if ((Index->Signature == CM_KEY_FAST_LEAF) ||
(Index->Signature == CM_KEY_HASH_LEAF))
{
/* Get the Fast/Hash Index */
FastIndex = (PCM_KEY_FAST_INDEX)Index;
FastEntry = &FastIndex->List[Count];
/* Check if we are a hash leaf, in which case we skip all this */
if (Index->Signature == CM_KEY_FAST_LEAF)
{
/* Find out just how much of the name is there */
for (i = 0; i < 4; i++)
{
/* Check if this entry is empty */
if (!FastEntry->NameHint[i])
{
/* Only this much! */
ActualNameLength = i;
break;
}
}
/* How large is the name and how many characters to compare */
NameLength = SearchName->Length / sizeof(WCHAR);
CompareLength = min(NameLength, ActualNameLength);
/* Loop all the chars we'll test */
for (i = 0; i < CompareLength; i++)
{
/* Get one char from each buffer */
p = SearchName->Buffer[i];
pp = FastEntry->NameHint[i];
/* See if they match and return result if they don't */
Result = (LONG)RtlUpcaseUnicodeChar(p) -
(LONG)RtlUpcaseUnicodeChar(pp);
if (Result) return (Result > 0) ? 1 : -1;
}
}
/* If we got here then we have to do a full compare */
Result = CmpDoCompareKeyName(Hive, SearchName, FastEntry->Cell);
if (Result == 2) return Result;
if (!Result) *SubKey = FastEntry->Cell;
}
else
{
/* We aren't, so do a name compare and return the subkey found */
Result = CmpDoCompareKeyName(Hive, SearchName, Index->List[Count]);
if (Result == 2) return Result;
if (!Result) *SubKey = Index->List[Count];
}
/* Return the comparison result */
return Result;
}
ULONG
NTAPI
CmpFindSubKeyInRoot(IN PHHIVE Hive,
IN PCM_KEY_INDEX Index,
IN PCUNICODE_STRING SearchName,
IN PHCELL_INDEX SubKey)
{
ULONG High, Low = 0, i = 0, ReturnIndex;
HCELL_INDEX LeafCell;
PCM_KEY_INDEX Leaf;
LONG Result;
/* Verify Index for validity */
ASSERT(Index->Count != 0);
ASSERT(Index->Signature == CM_KEY_INDEX_ROOT);
/* Set high limit and loop */
High = Index->Count - 1;
while (TRUE)
{
/* Choose next entry */
i = ((High - Low) / 2) + Low;
/* Get the leaf cell and then the leaf itself */
LeafCell = Index->List[i];
Leaf = (PCM_KEY_INDEX)HvGetCell(Hive, LeafCell);
if (Leaf)
{
/* Make sure the leaf is valid */
ASSERT((Leaf->Signature == CM_KEY_INDEX_LEAF) ||
(Leaf->Signature == CM_KEY_FAST_LEAF) ||
(Leaf->Signature == CM_KEY_HASH_LEAF));
ASSERT(Leaf->Count != 0);
/* Do the compare */
Result = CmpCompareInIndex(Hive,
SearchName,
Leaf->Count - 1,
Leaf,
SubKey);
if (Result == 2) goto Big;
/* Check if we found the leaf */
if (!Result)
{
/* We found the leaf */
*SubKey = LeafCell;
ReturnIndex = i;
goto Return;
}
/* Check for negative result */
if (Result < 0)
{
/* If we got here, we should be at -1 */
ASSERT(Result == -1);
/* Do another lookup, since we might still be in the right leaf */
Result = CmpCompareInIndex(Hive,
SearchName,
0,
Leaf,
SubKey);
if (Result == 2) goto Big;
/* Check if it's not below */
if (Result >= 0)
{
/*
* If the name was first below, and now it is above,
* then this means that it is somewhere in this leaf.
* Make sure we didn't get some weird result
*/
ASSERT((Result == 1) || (Result == 0));
/* Return it */
*SubKey = LeafCell;
ReturnIndex = i;
goto Return;
}
/* Update the limit to this index, since we know it's not higher. */
High = i;
}
else
{
/* Update the base to this index, since we know it's not lower. */
Low = i;
}
}
else
{
Big:
/* This was some sort of special key */
ReturnIndex = INVALID_INDEX;
goto ReturnFailure;
}
/* Check if there is only one entry left */
if ((High - Low) <= 1) break;
/* Release the leaf cell */
HvReleaseCell(Hive, LeafCell);
}
/* Make sure we got here for the right reasons */
ASSERT((High - Low == 1) || (High == Low));
/* Get the leaf cell and the leaf */
LeafCell = Index->List[Low];
Leaf = (PCM_KEY_INDEX)HvGetCell(Hive, LeafCell);
if (!Leaf) goto Big;
/* Do the compare */
Result = CmpCompareInIndex(Hive,
SearchName,
Leaf->Count-1,
Leaf,
SubKey);
if (Result == 2) goto Big;
/* Check if we found it */
if (!Result)
{
/* We got lucky... return it */
*SubKey = LeafCell;
ReturnIndex = Low;
goto Return;
}
/* It's below, so could still be in this leaf */
if (Result < 0)
{
/* Make sure we're -1 */
ASSERT(Result == -1);
/* Do a search from the bottom */
Result = CmpCompareInIndex(Hive, SearchName, 0, Leaf, SubKey);
if (Result == 2) goto Big;
/*
* Check if it's above, which means that it's within the ranges of our
* leaf (since we were below before).
*/
if (Result >= 0)
{
/* Sanity check */
ASSERT((Result == 1) || (Result == 0));
/* Yep, so we're in the right leaf; return it. */
*SubKey = LeafCell;
ReturnIndex = Low;
goto Return;
}
/* It's still below us, so fail */
ReturnIndex = Low;
goto ReturnFailure;
}
/* Release the leaf cell */
HvReleaseCell(Hive, LeafCell);
/* Well the low didn't work too well, so try the high. */
LeafCell = Index->List[High];
Leaf = (PCM_KEY_INDEX)HvGetCell(Hive, LeafCell);
if (!Leaf) goto Big;
/* Do the compare */
Result = CmpCompareInIndex(Hive,
SearchName,
Leaf->Count - 1,
Leaf,
SubKey);
if (Result == 2) goto Big;
/* Check if we found it */
if (Result == 0)
{
/* We got lucky... return it */
*SubKey = LeafCell;
ReturnIndex = High;
goto Return;
}
/* Check if we are too high */
if (Result < 0)
{
/* Make sure we're -1 */
ASSERT(Result == -1);
/*
* Once again... since we were first too low and now too high, then
* this means we are within the range of this leaf... return it.
*/
*SubKey = LeafCell;
ReturnIndex = High;
goto Return;
}
/* If we got here, then we are too low, again. */
ReturnIndex = High;
/* Failure path */
ReturnFailure:
*SubKey = HCELL_NIL;
/* Return path...check if we have a leaf to free */
Return:
if (Leaf) HvReleaseCell(Hive, LeafCell);
/* Return the index */
return ReturnIndex;
}
ULONG
NTAPI
CmpFindSubKeyInLeaf(IN PHHIVE Hive,
IN PCM_KEY_INDEX Index,
IN PCUNICODE_STRING SearchName,
IN PHCELL_INDEX SubKey)
{
ULONG High, Low = 0, i;
LONG Result;
/* Verify Index for validity */
ASSERT((Index->Signature == CM_KEY_INDEX_LEAF) ||
(Index->Signature == CM_KEY_FAST_LEAF) ||
(Index->Signature == CM_KEY_HASH_LEAF));
/* Get the upper bound and middle entry */
High = Index->Count - 1;
i = High / 2;
/* Check if we don't actually have any entries */
if (!Index->Count)
{
/* Return failure */
*SubKey = HCELL_NIL;
return 0;
}
/* Start compare loop */
while (TRUE)
{
/* Do the actual comparison and check the result */
Result = CmpCompareInIndex(Hive, SearchName, i, Index, SubKey);
if (Result == 2)
{
/* Fail with special value */
*SubKey = HCELL_NIL;
return INVALID_INDEX;
}
/* Check if we got lucky and found it */
if (!Result) return i;
/* Check if the result is below us */
if (Result < 0)
{
/* Set the new bound; it can't be higher then where we are now. */
ASSERT(Result == -1);
High = i;
}
else
{
/* Set the new bound... it can't be lower then where we are now. */
ASSERT(Result == 1);
Low = i;
}
/* Check if this is the last entry, if so, break out and handle it */
if ((High - Low) <= 1) break;
/* Set the new index */
i = ((High - Low) / 2) + Low;
}
/*
* If we get here, High - Low = 1 or High == Low
* Simply look first at Low, then at High
*/
Result = CmpCompareInIndex(Hive, SearchName, Low, Index, SubKey);
if (Result == 2)
{
/* Fail with special value */
*SubKey = HCELL_NIL;
return INVALID_INDEX;
}
/* Check if we got lucky and found it */
if (!Result) return Low;
/* Check if the result is below us */
if (Result < 0)
{
/* Return the low entry */
ASSERT(Result == -1);
return Low;
}
/*
* If we got here, then just check the high and return it no matter what
* the result is (since we're a leaf, it has to be near there anyway).
*/
Result = CmpCompareInIndex(Hive, SearchName, High, Index, SubKey);
if (Result == 2)
{
/* Fail with special value */
*SubKey = HCELL_NIL;
return INVALID_INDEX;
}
/* Return the high */
return High;
}
ULONG
NTAPI
CmpComputeHashKey(IN ULONG Hash,
IN PCUNICODE_STRING Name,
IN BOOLEAN AllowSeparators)
{
LPWSTR Cp;
ULONG Value, i;
/* Make some sanity checks on our parameters */
ASSERT((Name->Length == 0) ||
(AllowSeparators) ||
(Name->Buffer[0] != OBJ_NAME_PATH_SEPARATOR));
/* If the name is empty, there is nothing to hash! */
if (!Name->Length) return Hash;
/* Set the buffer and loop every character */
Cp = Name->Buffer;
for (i = 0; i < Name->Length; i += sizeof(WCHAR), Cp++)
{
/* Make sure we don't have a separator when we shouldn't */
ASSERT(AllowSeparators || (*Cp != OBJ_NAME_PATH_SEPARATOR));
/* Check what kind of char we have */
if (*Cp >= L'a')
{
/* In the lower case region... is it truly lower case? */
if (*Cp < L'z')
{
/* Yes! Calculate it ourselves! */
Value = *Cp - L'a' + L'A';
}
else
{
/* No, use the API */
Value = RtlUpcaseUnicodeChar(*Cp);
}
}
else
{
/* Reuse the char, it's already upcased */
Value = *Cp;
}
/* Multiply by a prime and add our value */
Hash *= 37;
Hash += Value;
}
/* Return the hash */
return Hash;
}
HCELL_INDEX
NTAPI
CmpDoFindSubKeyByNumber(IN PHHIVE Hive,
IN PCM_KEY_INDEX Index,
IN ULONG Number)
{
ULONG i;
HCELL_INDEX LeafCell = 0;
PCM_KEY_INDEX Leaf = NULL;
PCM_KEY_FAST_INDEX FastIndex;
HCELL_INDEX Result;
/* Check if this is a root */
if (Index->Signature == CM_KEY_INDEX_ROOT)
{
/* Loop the index */
for (i = 0; i < Index->Count; i++)
{
/* Check if this isn't the first iteration */
if (i)
{
/* Make sure we had something valid, and release it */
ASSERT(Leaf != NULL );
ASSERT(LeafCell == Index->List[i - 1]);
HvReleaseCell(Hive, LeafCell);
}
/* Get the leaf cell and the leaf for this index */
LeafCell = Index->List[i];
Leaf = (PCM_KEY_INDEX)HvGetCell(Hive, LeafCell);
if (!Leaf) return HCELL_NIL;
/* Check if the index may be inside it */
if (Number < Leaf->Count)
{
/* Check if this is a fast or hash leaf */
if ((Leaf->Signature == CM_KEY_FAST_LEAF) ||
(Leaf->Signature == CM_KEY_HASH_LEAF))
{
/* Get the fast index */
FastIndex = (PCM_KEY_FAST_INDEX)Leaf;
/* Look inside the list to get our actual cell */
Result = FastIndex->List[Number].Cell;
HvReleaseCell(Hive, LeafCell);
return Result;
}
else
{
/* Regular leaf, so just use the index directly */
Result = Leaf->List[Number];
/* Release and return it */
HvReleaseCell(Hive,LeafCell);
return Result;
}
}
else
{
/* Otherwise, skip this leaf */
Number = Number - Leaf->Count;
}
}
/* Should never get here */
ASSERT(FALSE);
}
/* If we got here, then the cell is in this index */
ASSERT(Number < Index->Count);
/* Check if we're a fast or hash leaf */
if ((Index->Signature == CM_KEY_FAST_LEAF) ||
(Index->Signature == CM_KEY_HASH_LEAF))
{
/* We are, get the fast index and get the cell from the list */
FastIndex = (PCM_KEY_FAST_INDEX)Index;
return FastIndex->List[Number].Cell;
}
else
{
/* We aren't, so use the index directly to grab the cell */
return Index->List[Number];
}
}
HCELL_INDEX
NTAPI
CmpFindSubKeyByNumber(IN PHHIVE Hive,
IN PCM_KEY_NODE Node,
IN ULONG Number)
{
PCM_KEY_INDEX Index;
HCELL_INDEX Result = HCELL_NIL;
/* Check if it's in the stable list */
if (Number < Node->SubKeyCounts[Stable])
{
/* Get the actual key index */
Index = (PCM_KEY_INDEX)HvGetCell(Hive, Node->SubKeyLists[Stable]);
if (!Index) return HCELL_NIL;
/* Do a search inside it */
Result = CmpDoFindSubKeyByNumber(Hive, Index, Number);
/* Release the cell and return the result */
HvReleaseCell(Hive, Node->SubKeyLists[Stable]);
return Result;
}
else if (Hive->StorageTypeCount > Volatile)
{
/* It's in the volatile list */
Number = Number - Node->SubKeyCounts[Stable];
if (Number < Node->SubKeyCounts[Volatile])
{
/* Get the actual key index */
Index = (PCM_KEY_INDEX)HvGetCell(Hive, Node->SubKeyLists[Volatile]);
if (!Index) return HCELL_NIL;
/* Do a search inside it */
Result = CmpDoFindSubKeyByNumber(Hive, Index, Number);
/* Release the cell and return the result */
HvReleaseCell(Hive, Node->SubKeyLists[Volatile]);
return Result;
}
}
/* Nothing was found */
return HCELL_NIL;
}
static HCELL_INDEX
NTAPI
CmpFindSubKeyByHash(IN PHHIVE Hive,
IN PCM_KEY_FAST_INDEX FastIndex,
IN PCUNICODE_STRING SearchName)
{
ULONG HashKey, i;
PCM_INDEX FastEntry;
/* Make sure it's really a hash */
ASSERT(FastIndex->Signature == CM_KEY_HASH_LEAF);
/* Compute the hash key for the name */
HashKey = CmpComputeHashKey(0, SearchName, FALSE);
/* Loop all the entries */
for (i = 0; i < FastIndex->Count; i++)
{
/* Get the entry */
FastEntry = &FastIndex->List[i];
/* Compare the hash first */
if (FastEntry->HashKey == HashKey)
{
/* Go ahead for a full compare */
if (!(CmpDoCompareKeyName(Hive, SearchName, FastEntry->Cell)))
{
/* It matched, return the cell */
return FastEntry->Cell;
}
}
}
/* If we got here then we failed */
return HCELL_NIL;
}
HCELL_INDEX
NTAPI
CmpFindSubKeyByName(IN PHHIVE Hive,
IN PCM_KEY_NODE Parent,
IN PCUNICODE_STRING SearchName)
{
ULONG i;
PCM_KEY_INDEX IndexRoot;
HCELL_INDEX SubKey, CellToRelease;
ULONG Found;
/* Loop each storage type */
for (i = 0; i < Hive->StorageTypeCount; i++)
{
/* Make sure the parent node has subkeys */
if (Parent->SubKeyCounts[i])
{
/* Get the Index */
IndexRoot = (PCM_KEY_INDEX)HvGetCell(Hive, Parent->SubKeyLists[i]);
if (!IndexRoot) return HCELL_NIL;
/* Get the cell we'll need to release */
CellToRelease = Parent->SubKeyLists[i];
/* Check if this is another index root */
if (IndexRoot->Signature == CM_KEY_INDEX_ROOT)
{
/* Lookup the name in the root */
Found = CmpFindSubKeyInRoot(Hive,
IndexRoot,
SearchName,
&SubKey);
/* Release the previous cell */
ASSERT(CellToRelease != HCELL_NIL);
HvReleaseCell(Hive, CellToRelease);
/* Make sure we found something valid */
if (Found & INVALID_INDEX) break;
/* Get the new Index Root and set the new cell to be released */
if (SubKey == HCELL_NIL) continue;
CellToRelease = SubKey;
IndexRoot = (PCM_KEY_INDEX)HvGetCell(Hive, SubKey);
}
/* Make sure the signature is what we expect it to be */
ASSERT((IndexRoot->Signature == CM_KEY_INDEX_LEAF) ||
(IndexRoot->Signature == CM_KEY_FAST_LEAF) ||
(IndexRoot->Signature == CM_KEY_HASH_LEAF));
/* Check if this isn't a hashed leaf */
if (IndexRoot->Signature != CM_KEY_HASH_LEAF)
{
/* Find the subkey in the leaf */
Found = CmpFindSubKeyInLeaf(Hive,
IndexRoot,
SearchName,
&SubKey);
/* Release the previous cell */
ASSERT(CellToRelease != HCELL_NIL);
HvReleaseCell(Hive, CellToRelease);
/* Make sure we found a valid index */
if (Found & INVALID_INDEX) break;
}
else
{
/* Find the subkey in the hash */
SubKey = CmpFindSubKeyByHash(Hive,
(PCM_KEY_FAST_INDEX)IndexRoot,
SearchName);
/* Release the previous cell */
ASSERT(CellToRelease != HCELL_NIL);
HvReleaseCell(Hive, CellToRelease);
}
/* Make sure we got a valid subkey and return it */
if (SubKey != HCELL_NIL) return SubKey;
}
}
/* If we got here, then we failed */
return HCELL_NIL;
}
BOOLEAN
NTAPI
CmpMarkIndexDirty(IN PHHIVE Hive,
IN HCELL_INDEX ParentKey,
IN HCELL_INDEX TargetKey)
{
PCM_KEY_NODE Node;
UNICODE_STRING SearchName;
BOOLEAN IsCompressed;
ULONG i, Result;
PCM_KEY_INDEX Index;
HCELL_INDEX IndexCell, Child = HCELL_NIL, CellToRelease = HCELL_NIL;
/* Get the target key node */
Node = (PCM_KEY_NODE)HvGetCell(Hive, TargetKey);
if (!Node) return FALSE;
/* Check if it's compressed */
if (Node->Flags & KEY_COMP_NAME)
{
/* Remember this for later */
IsCompressed = TRUE;
/* Build the search name */
SearchName.Length = CmpCompressedNameSize(Node->Name,
Node->NameLength);
SearchName.MaximumLength = SearchName.Length;
SearchName.Buffer = CmpAllocate(SearchName.Length,
TRUE,
TAG_CM);
if (!SearchName.Buffer)
{
/* Fail */
HvReleaseCell(Hive, TargetKey);
return FALSE;
}
/* Copy it */
CmpCopyCompressedName(SearchName.Buffer,
SearchName.MaximumLength,
Node->Name,
Node->NameLength);
}
else
{
/* Name isn't compressed, build it directly from the node */
IsCompressed = FALSE;
SearchName.Length = Node->NameLength;
SearchName.MaximumLength = Node->NameLength;
SearchName.Buffer = Node->Name;
}
/* We can release the target key now */
HvReleaseCell(Hive, TargetKey);
/* Now get the parent key node */
Node = (PCM_KEY_NODE)HvGetCell(Hive, ParentKey);
if (!Node) goto Quickie;
/* Loop all hive storage */
for (i = 0; i < Hive->StorageTypeCount; i++)
{
/* Check if any subkeys are in this index */
if (Node->SubKeyCounts[i])
{
/* Get the cell index */
//ASSERT(HvIsCellAllocated(Hive, Node->SubKeyLists[i]));
IndexCell = Node->SubKeyLists[i];
/* Check if we had anything to release from before */
if (CellToRelease != HCELL_NIL)
{
/* Release it now */
HvReleaseCell(Hive, CellToRelease);
CellToRelease = HCELL_NIL;
}
/* Get the key index for the cell */
Index = (PCM_KEY_INDEX)HvGetCell(Hive, IndexCell);
if (!Index) goto Quickie;
/* Release it at the next iteration or below */
CellToRelease = IndexCell;
/* Check if this is a root */
if (Index->Signature == CM_KEY_INDEX_ROOT)
{
/* Get the child inside the root */
Result = CmpFindSubKeyInRoot(Hive, Index, &SearchName, &Child);
if (Result & INVALID_INDEX) goto Quickie;
if (Child == HCELL_NIL) continue;
/* We found it, mark the cell dirty */
HvMarkCellDirty(Hive, IndexCell, FALSE);
/* Check if we had anything to release from before */
if (CellToRelease != HCELL_NIL)
{
/* Release it now */
HvReleaseCell(Hive, CellToRelease);
CellToRelease = HCELL_NIL;
}
/* Now this child is the index, get the actual key index */
IndexCell = Child;
Index = (PCM_KEY_INDEX)HvGetCell(Hive, Child);
if (!Index) goto Quickie;
/* Release it later */
CellToRelease = Child;
}
/* Make sure this is a valid index */
ASSERT((Index->Signature == CM_KEY_INDEX_LEAF) ||
(Index->Signature == CM_KEY_FAST_LEAF) ||
(Index->Signature == CM_KEY_HASH_LEAF));
/* Find the child in the leaf */
Result = CmpFindSubKeyInLeaf(Hive, Index, &SearchName, &Child);
if (Result & INVALID_INDEX) goto Quickie;
if (Child != HCELL_NIL)
{
/* We found it, free the name now */
if (IsCompressed) CmpFree(SearchName.Buffer, 0);
/* Release the parent key */
HvReleaseCell(Hive, ParentKey);
/* Check if we had a left over cell to release */
if (CellToRelease != HCELL_NIL)
{
/* Release it */
HvReleaseCell(Hive, CellToRelease);
}
/* And mark the index cell dirty */
HvMarkCellDirty(Hive, IndexCell, FALSE);
return TRUE;
}
}
}
Quickie:
/* Release any cells that we still hold */
if (Node) HvReleaseCell(Hive, ParentKey);
if (CellToRelease != HCELL_NIL) HvReleaseCell(Hive, CellToRelease);
/* Free the search name and return failure */
if (IsCompressed) CmpFree(SearchName.Buffer, 0);
return FALSE;
}
HCELL_INDEX
NTAPI
CmpAddToLeaf(IN PHHIVE Hive,
IN HCELL_INDEX LeafCell,
IN HCELL_INDEX NewKey,
IN PUNICODE_STRING Name)
{
PCM_KEY_INDEX Leaf;
PCM_KEY_FAST_INDEX FastLeaf;
ULONG Size, OldSize, EntrySize, i, j;
HCELL_INDEX NewCell, Child;
LONG Result;
/* Mark the leaf dirty */
HvMarkCellDirty(Hive, LeafCell, FALSE);
/* Get the leaf cell */
Leaf = (PCM_KEY_INDEX)HvGetCell(Hive, LeafCell);
if (!Leaf)
{
/* Shouldn't happen */
ASSERT(FALSE);
return HCELL_NIL;
}
/* Release it */
HvReleaseCell(Hive, LeafCell);
/* Check if this is an index leaf */
if (Leaf->Signature == CM_KEY_INDEX_LEAF)
{
/* This is an old-style leaf */
FastLeaf = NULL;
EntrySize = sizeof(HCELL_INDEX);
}
else
{
/* Sanity check */
ASSERT((Leaf->Signature == CM_KEY_FAST_LEAF) ||
(Leaf->Signature == CM_KEY_HASH_LEAF));
/* This is a new-style optimized fast (or hash) leaf */
FastLeaf = (PCM_KEY_FAST_INDEX)Leaf;
EntrySize = sizeof(CM_INDEX);
}
/* Get the current size of the leaf */
OldSize = HvGetCellSize(Hive, Leaf);
/* Calculate the size of the free entries */
Size = OldSize;
Size -= EntrySize * Leaf->Count + FIELD_OFFSET(CM_KEY_INDEX, List);
/* Assume we'll re-use the same leaf */
NewCell = LeafCell;
/* Check if we're out of space */
if ((Size / EntrySize) < 1)
{
/* Grow the leaf by 1.5x, making sure we can at least fit this entry */
Size = OldSize + OldSize / 2;
if (Size < (OldSize + EntrySize)) Size = OldSize + EntrySize;
/* Re-allocate the leaf */
NewCell = HvReallocateCell(Hive, LeafCell, Size);
if (NewCell == HCELL_NIL) return HCELL_NIL;
/* Get the leaf cell */
Leaf = (PCM_KEY_INDEX)HvGetCell(Hive, NewCell);
if (!Leaf)
{
/* This shouldn't happen */
ASSERT(FALSE);
return HCELL_NIL;
}
/* Release the cell */
HvReleaseCell(Hive, NewCell);
/* Update the fast leaf pointer if we had one */
if (FastLeaf) FastLeaf = (PCM_KEY_FAST_INDEX)Leaf;
}
/* Find the insertion point for our entry */
i = CmpFindSubKeyInLeaf(Hive, Leaf, Name, &Child);
if (i & INVALID_INDEX) return HCELL_NIL;
ASSERT(Child == HCELL_NIL);
/* Check if we're not last */
if (i != Leaf->Count)
{
/* Find out where we should go */
Result = CmpCompareInIndex(Hive,
Name,
i,
Leaf,
&Child);
if (Result == 2) return HCELL_NIL;
ASSERT(Result != 0);
/* Check if we come after */
if (Result > 0)
{
/* We do, insert us after the key */
ASSERT(Result == 1);
i++;
}
/* Check if we're still not last */
if (i != Leaf->Count)
{
/* Check if we had a fast leaf or not */
if (FastLeaf)
{
/* Copy the fast indexes */
RtlMoveMemory(&FastLeaf->List[i + 1],
&FastLeaf->List[i],
(FastLeaf->Count - i) * sizeof(CM_INDEX));
}
else
{
/* Copy the indexes themselves */
RtlMoveMemory(&Leaf->List[i + 1],
&Leaf->List[i],
(Leaf->Count - i) * sizeof(HCELL_INDEX));
}
}
}
/* Check if this is a new-style leaf */
if (FastLeaf)
{
/* Set our cell */
FastLeaf->List[i].Cell = NewKey;
/* Check if this is a hash leaf */
if( FastLeaf->Signature == CM_KEY_HASH_LEAF )
{
/* Set our hash key */
FastLeaf->List[i].HashKey = CmpComputeHashKey(0, Name, FALSE);
}
else
{
/* First, clear the name */
FastLeaf->List[i].NameHint[0] = 0;
FastLeaf->List[i].NameHint[1] = 0;
FastLeaf->List[i].NameHint[2] = 0;
FastLeaf->List[i].NameHint[3] = 0;
/* Now, figure out if we can fit */
if (Name->Length / sizeof(WCHAR) < 4)
{
/* We can fit, use our length */
j = Name->Length / sizeof(WCHAR);
}
else
{
/* We can't, use a maximum of 4 */
j = 4;
}
/* Now fill out the name hint */
do
{
/* Look for invalid characters and break out if we found one */
if ((USHORT)Name->Buffer[j - 1] > (UCHAR)-1) break;
/* Otherwise, copy the a character */
FastLeaf->List[i].NameHint[j - 1] = (UCHAR)Name->Buffer[j - 1];
} while (--j > 0);
}
}
else
{
/* This is an old-style leaf, just set our index directly */
Leaf->List[i] = NewKey;
}
/* Update the leaf count and return the new cell */
Leaf->Count += 1;
return NewCell;
}
HCELL_INDEX
NTAPI
CmpSplitLeaf(IN PHHIVE Hive,
IN HCELL_INDEX RootCell,
IN ULONG RootSelect,
IN HSTORAGE_TYPE Type)
{
PCM_KEY_INDEX IndexKey, LeafKey, NewKey;
PCM_KEY_FAST_INDEX FastLeaf;
HCELL_INDEX LeafCell, NewCell;
USHORT FirstHalf, LastHalf;
ULONG EntrySize, TotalSize;
/* Get the cell */
IndexKey = (PCM_KEY_INDEX)HvGetCell(Hive, RootCell);
/* Check if we've got valid IndexKey */
if (!IndexKey) return HCELL_NIL;
/* Get the leaf cell and key */
LeafCell = IndexKey->List[RootSelect];
LeafKey = (PCM_KEY_INDEX)HvGetCell(Hive, LeafCell);
/* Check if we've got valid LeafKey */
if (!LeafKey) return HCELL_NIL;
/* We are going to divide this leaf into two halves */
FirstHalf = (LeafKey->Count / 2);
LastHalf = LeafKey->Count - FirstHalf;
/* Now check what kind of hive we're dealing with,
* and compute entry size
*/
if (Hive->Version >= 5)
{
/* XP Hive: Use hash leaf */
ASSERT(LeafKey->Signature == CM_KEY_HASH_LEAF);
EntrySize = sizeof(CM_INDEX);
}
else
{
/* Use index leaf */
ASSERT(LeafKey->Signature == CM_KEY_INDEX_LEAF);
EntrySize = sizeof(HCELL_INDEX);
}
/* Compute the total size */
TotalSize = (EntrySize * LastHalf) + FIELD_OFFSET(CM_KEY_INDEX, List) + 1;
/* Mark the leaf cell dirty */
HvMarkCellDirty(Hive, LeafCell, FALSE);
/* Make sure its type is the same */
ASSERT(HvGetCellType(LeafCell) == Type);
/* Allocate the cell, fail in case of error */
NewCell = HvAllocateCell(Hive, TotalSize, Type, LeafCell);
if (NewCell == HCELL_NIL) return NewCell;
/* Get the key */
NewKey = (PCM_KEY_INDEX)HvGetCell(Hive, NewCell);
if (!NewKey)
{
/* Free the cell and exit - should not happen! */
ASSERT(FALSE);
HvFreeCell(Hive, NewCell);
return HCELL_NIL;
}
/* Release the newly created cell */
HvReleaseCell(Hive, NewCell);
/* Set its signature according to the version of the hive */
if (Hive->Version >= 5)
{
/* XP Hive: Use hash leaf signature */
NewKey->Signature = CM_KEY_HASH_LEAF;
}
else
{
/* Use index leaf signature */
NewKey->Signature = CM_KEY_INDEX_LEAF;
}
/* Calculate the size of the free entries in the root key */
TotalSize = HvGetCellSize(Hive, IndexKey) -
(IndexKey->Count * sizeof(HCELL_INDEX)) -
FIELD_OFFSET(CM_KEY_INDEX, List);
/* Check if we're out of space */
if (TotalSize / sizeof(HCELL_INDEX) < 1)
{
/* Grow the leaf by one more entry */
TotalSize = HvGetCellSize(Hive, IndexKey) + sizeof(HCELL_INDEX);
/* Re-allocate the root */
RootCell = HvReallocateCell(Hive, RootCell, TotalSize);
if (RootCell == HCELL_NIL)
{
/* Free the cell and exit */
HvFreeCell(Hive, NewCell);
return HCELL_NIL;
}
/* Get the leaf cell */
IndexKey = (PCM_KEY_INDEX)HvGetCell(Hive, RootCell);
if (!IndexKey)
{
/* This shouldn't happen */
ASSERT(FALSE);
return HCELL_NIL;
}
}
/* Splitting is done, now we need to copy the contents,
* according to the hive version
*/
if (Hive->Version >= 5)
{
/* Copy the fast indexes */
FastLeaf = (PCM_KEY_FAST_INDEX)LeafKey;
RtlMoveMemory(&NewKey->List[0],
&FastLeaf->List[FirstHalf],
LastHalf * EntrySize);
}
else
{
/* Copy the indexes themselves */
RtlMoveMemory(&NewKey->List[0],
&LeafKey->List[FirstHalf],
LastHalf * EntrySize);
}
/* Shift the data inside the root key */
if ((RootSelect + 1) < IndexKey->Count)
{
RtlMoveMemory(&IndexKey->List[RootSelect + 2],
&IndexKey->List[RootSelect + 1],
(IndexKey->Count -
(RootSelect + 1)) * sizeof(HCELL_INDEX));
}
/* Make sure both old and new computed counts are valid */
ASSERT(FirstHalf != 0);
ASSERT(LastHalf != 0);
/* Update the count value of old and new keys */
LeafKey->Count = FirstHalf;
NewKey->Count = LastHalf;
/* Increase the count value of the root key */
IndexKey->Count++;
/* Set the new cell in root's list */
IndexKey->List[RootSelect + 1] = NewCell;
/* Return the root cell */
return RootCell;
}
HCELL_INDEX
NTAPI
CmpSelectLeaf(IN PHHIVE Hive,
IN PCM_KEY_NODE KeyNode,
IN PUNICODE_STRING Name,
IN HSTORAGE_TYPE Type,
IN PHCELL_INDEX *RootCell)
{
PCM_KEY_INDEX IndexKey, LeafKey;
PCM_KEY_FAST_INDEX FastLeaf;
HCELL_INDEX LeafCell, CurrentCell;
ULONG SubKeyIndex;
LONG Result;
/* Mark it as dirty */
HvMarkCellDirty(Hive, KeyNode->SubKeyLists[Type], FALSE);
/* Get the cell */
IndexKey = (PCM_KEY_INDEX)HvGetCell(Hive, KeyNode->SubKeyLists[Type]);
/* Check if we've got a valid key */
if (!IndexKey)
{
/* Should not happen! */
ASSERT(IndexKey != NULL);
return HCELL_NIL;
}
/* Sanity check */
ASSERT(IndexKey->Signature == CM_KEY_INDEX_ROOT);
while (TRUE)
{
/* Find subkey */
SubKeyIndex = CmpFindSubKeyInRoot(Hive, IndexKey, Name, &LeafCell);
/* Make sure we found something valid */
if (SubKeyIndex & INVALID_INDEX) return HCELL_NIL;
/* Try to fit it into the LeafCell, if it was found */
if (LeafCell != HCELL_NIL)
{
/* Get the leaf key */
LeafKey = (PCM_KEY_INDEX)HvGetCell(Hive, LeafCell);
/* Check for failure */
if (!LeafKey) return HCELL_NIL;
/* Check if it fits into this leaf and break */
if (LeafKey->Count < CmpMaxIndexPerHblock)
{
/* Fill in the result and return it */
*RootCell = &IndexKey->List[SubKeyIndex];
return LeafCell;
}
/* It didn't fit, so proceed to splitting */
}
else
{
/* Get the leaf cell at the very end */
LeafCell = IndexKey->List[SubKeyIndex];
LeafKey = (PCM_KEY_INDEX)HvGetCell(Hive, LeafCell);
/* Return an error in case of problems */
if (!LeafKey) return HCELL_NIL;
/* Choose the cell to search from depending on the key type */
if ((LeafKey->Signature == CM_KEY_FAST_LEAF) ||
(LeafKey->Signature == CM_KEY_HASH_LEAF))
{
FastLeaf = (PCM_KEY_FAST_INDEX)LeafKey;
CurrentCell = FastLeaf->List[0].Cell;
}
else
{
/* Make sure it's an index leaf */
ASSERT(LeafKey->Signature == CM_KEY_INDEX_LEAF);
CurrentCell = LeafKey->List[0];
}
/* Do a name compare */
Result = CmpDoCompareKeyName(Hive, Name, CurrentCell);
/* Check for failure */
if (Result == 2) return HCELL_NIL;
/* Names can't be equal, ensure that */
ASSERT(Result != 0);
/* Check if it's above */
if (Result >= 0)
{
/* Get the cell in the index */
LeafCell = IndexKey->List[SubKeyIndex];
LeafKey = (PCM_KEY_INDEX)HvGetCell(Hive, LeafCell);
/* Return an error in case of problems */
if (!LeafKey) return HCELL_NIL;
/* Check if it fits into this leaf */
if (LeafKey->Count < CmpMaxIndexPerHblock)
{
/* Fill in the result and return the cell */
*RootCell = &IndexKey->List[SubKeyIndex];
return LeafCell;
}
/* No, it doesn't fit, check the next adjacent leaf */
if ((SubKeyIndex + 1) < IndexKey->Count)
{
/* Yes, there is space */
LeafCell = IndexKey->List[SubKeyIndex + 1];
LeafKey = (PCM_KEY_INDEX)HvGetCell(Hive, LeafCell);
/* Return an error in case of problems */
if (!LeafKey) return HCELL_NIL;
/* Check if it fits and break */
if (LeafKey->Count < CmpMaxIndexPerHblock)
{
/* Fill in the result and return the cell */
*RootCell = &IndexKey->List[SubKeyIndex + 1];
return LeafCell;
}
}
/* It didn't fit, so proceed to splitting */
}
else
{
/* No, it's below, check the subkey index */
if (SubKeyIndex > 0)
{
/* There should be space at the leaf one before that */
LeafCell = IndexKey->List[SubKeyIndex - 1];
LeafKey = (PCM_KEY_INDEX)HvGetCell(Hive, LeafCell);
/* Return an error in case of problems */
if (!LeafKey) return HCELL_NIL;
/* Check if it fits and break */
if (LeafKey->Count < CmpMaxIndexPerHblock)
{
/* Fill in the result and return the cell */
*RootCell = &IndexKey->List[SubKeyIndex - 1];
return LeafCell;
}
}
else
{
/* Use the first leaf, if possible */
LeafCell = IndexKey->List[0];
LeafKey = (PCM_KEY_INDEX)HvGetCell(Hive, LeafCell);
/* Return an error in case of problems */
if (!LeafKey) return HCELL_NIL;
/* Check if it fits and break */
if (LeafKey->Count < CmpMaxIndexPerHblock)
{
/* Fill in the result and return the cell */
*RootCell = &IndexKey->List[0];
return LeafCell;
}
}
/* It didn't fit into either, so proceed to splitting */
}
}
/* We need to split */
CurrentCell = CmpSplitLeaf(Hive,
KeyNode->SubKeyLists[Type],
SubKeyIndex,
Type);
/* Return failure in case splitting failed */
if (CurrentCell == HCELL_NIL) return CurrentCell;
/* Set the SubKeyLists value with the new key */
KeyNode->SubKeyLists[Type] = CurrentCell;
/* Get the new cell */
IndexKey = (PCM_KEY_INDEX)HvGetCell(Hive, KeyNode->SubKeyLists[Type]);
/* Return in case of failure */
if (!IndexKey) return HCELL_NIL;
/* Make sure the new key became index root */
ASSERT(IndexKey->Signature == CM_KEY_INDEX_ROOT);
/* Now loop over with the new IndexKey value, which definately
* has the space now
*/
}
/* Shouldn't come here */
return HCELL_NIL;
}
BOOLEAN
NTAPI
CmpAddSubKey(IN PHHIVE Hive,
IN HCELL_INDEX Parent,
IN HCELL_INDEX Child)
{
PCM_KEY_NODE KeyNode;
PCM_KEY_INDEX Index;
PCM_KEY_FAST_INDEX OldIndex;
UNICODE_STRING Name;
HCELL_INDEX IndexCell = HCELL_NIL, CellToRelease = HCELL_NIL, LeafCell;
PHCELL_INDEX RootPointer = NULL;
ULONG Type, i;
BOOLEAN IsCompressed;
PAGED_CODE();
/* Get the key node */
KeyNode = (PCM_KEY_NODE)HvGetCell(Hive, Child);
if (!KeyNode)
{
/* Shouldn't happen */
ASSERT(FALSE);
return FALSE;
}
/* Check if the name is compressed */
if (KeyNode->Flags & KEY_COMP_NAME)
{
/* Remember for later */
IsCompressed = TRUE;
/* Create the compressed name and allocate it */
Name.Length = CmpCompressedNameSize(KeyNode->Name, KeyNode->NameLength);
Name.MaximumLength = Name.Length;
Name.Buffer = Hive->Allocate(Name.Length, TRUE, TAG_CM);
if (!Name.Buffer)
{
/* Release the cell and fail */
HvReleaseCell(Hive, Child);
ASSERT(FALSE);
return FALSE;
}
/* Copy the compressed name */
CmpCopyCompressedName(Name.Buffer,
Name.MaximumLength,
KeyNode->Name,
KeyNode->NameLength);
}
else
{
/* Remember for later */
IsCompressed = FALSE;
/* Build the unicode string */
Name.Length = KeyNode->NameLength;
Name.MaximumLength = KeyNode->NameLength;
Name.Buffer = &KeyNode->Name[0];
}
/* Release the cell */
HvReleaseCell(Hive, Child);
/* Get the parent node */
KeyNode = (PCM_KEY_NODE)HvGetCell(Hive, Parent);
if (!KeyNode)
{
/* Not handled */
ASSERT(FALSE);
}
/* Find out the type of the cell, and check if this is the first subkey */
Type = HvGetCellType(Child);
if (!KeyNode->SubKeyCounts[Type])
{
/* Allocate a fast leaf */
IndexCell = HvAllocateCell(Hive, sizeof(CM_KEY_FAST_INDEX), Type, HCELL_NIL);
if (IndexCell == HCELL_NIL)
{
/* Not handled */
ASSERT(FALSE);
}
/* Get the leaf cell */
Index = (PCM_KEY_INDEX)HvGetCell(Hive, IndexCell);
if (!Index)
{
/* Shouldn't happen */
ASSERT(FALSE);
}
/* Now check what kind of hive we're dealing with */
if (Hive->Version >= 5)
{
/* XP Hive: Use hash leaf */
Index->Signature = CM_KEY_HASH_LEAF;
}
else if (Hive->Version >= 3)
{
/* Windows 2000 and ReactOS: Use fast leaf */
Index->Signature = CM_KEY_FAST_LEAF;
}
else
{
/* NT 4: Use index leaf */
Index->Signature = CM_KEY_INDEX_LEAF;
}
/* Setup the index list */
Index->Count = 0;
KeyNode->SubKeyLists[Type] = IndexCell;
}
else
{
/* We already have an index, get it */
Index = (PCM_KEY_INDEX)HvGetCell(Hive, KeyNode->SubKeyLists[Type]);
if (!Index)
{
/* Not handled */
ASSERT(FALSE);
}
/* Remember to release the cell later */
CellToRelease = KeyNode->SubKeyLists[Type];
/* Check if this is a fast leaf that's gotten too full */
if ((Index->Signature == CM_KEY_FAST_LEAF) &&
(Index->Count >= CmpMaxFastIndexPerHblock))
{
DPRINT("Doing Fast->Slow Leaf conversion\n");
/* Mark this cell as dirty */
HvMarkCellDirty(Hive, CellToRelease, FALSE);
/* Convert */
OldIndex = (PCM_KEY_FAST_INDEX)Index;
for (i = 0; i < OldIndex->Count; i++)
{
Index->List[i] = OldIndex->List[i].Cell;
}
/* Set the new type value */
Index->Signature = CM_KEY_INDEX_LEAF;
}
else if (((Index->Signature == CM_KEY_INDEX_LEAF) ||
(Index->Signature == CM_KEY_HASH_LEAF)) &&
(Index->Count >= CmpMaxIndexPerHblock))
{
/* This is an old/hashed leaf that's gotten too large, root it */
IndexCell = HvAllocateCell(Hive,
sizeof(CM_KEY_INDEX) +
sizeof(HCELL_INDEX),
Type,
HCELL_NIL);
if (IndexCell == HCELL_NIL)
{
/* Not handled */
ASSERT(FALSE);
}
/* Get the index cell */
Index = (PCM_KEY_INDEX)HvGetCell(Hive, IndexCell);
if (!Index)
{
/* Shouldn't happen */
ASSERT(FALSE);
}
/* Mark the index as a root, and set the index cell */
Index->Signature = CM_KEY_INDEX_ROOT;
Index->Count = 1;
Index->List[0] = KeyNode->SubKeyLists[Type];
KeyNode->SubKeyLists[Type] = IndexCell;
}
}
/* Now we can choose the leaf cell */
LeafCell = KeyNode->SubKeyLists[Type];
/* Check if we turned the index into a root */
if (Index->Signature == CM_KEY_INDEX_ROOT)
{
DPRINT("Leaf->Root Index Conversion\n");
/* Get the leaf where to add the new entry (the routine will do
* the splitting if necessary)
*/
LeafCell = CmpSelectLeaf(Hive, KeyNode, &Name, Type, &RootPointer);
if (LeafCell == HCELL_NIL)
{
/* Not handled */
ASSERT(FALSE);
}
}
/* Add our leaf cell */
LeafCell = CmpAddToLeaf(Hive, LeafCell, Child, &Name);
if (LeafCell == HCELL_NIL)
{
/* Not handled */
ASSERT(FALSE);
}
/* Update the key counts */
KeyNode->SubKeyCounts[Type]++;
/* Check if caller wants us to return the leaf */
if (RootPointer)
{
/* Return it */
*RootPointer = LeafCell;
}
else
{
/* Otherwise, mark it as the list index for the cell */
KeyNode->SubKeyLists[Type] = LeafCell;
}
/* If the name was compressed, free our copy */
if (IsCompressed) Hive->Free(Name.Buffer, 0);
/* Release all our cells */
if (IndexCell != HCELL_NIL) HvReleaseCell(Hive, IndexCell);
if (CellToRelease != HCELL_NIL) HvReleaseCell(Hive, CellToRelease);
HvReleaseCell(Hive, Parent);
return TRUE;
}
BOOLEAN
NTAPI
CmpRemoveSubKey(IN PHHIVE Hive,
IN HCELL_INDEX ParentKey,
IN HCELL_INDEX TargetKey)
{
PCM_KEY_NODE Node;
UNICODE_STRING SearchName;
BOOLEAN IsCompressed;
WCHAR Buffer[50];
HCELL_INDEX RootCell = HCELL_NIL, LeafCell, ChildCell;
PCM_KEY_INDEX Root = NULL, Leaf;
PCM_KEY_FAST_INDEX Child;
ULONG Storage, RootIndex = INVALID_INDEX, LeafIndex;
BOOLEAN Result = FALSE;
HCELL_INDEX CellToRelease1 = HCELL_NIL, CellToRelease2 = HCELL_NIL;
/* Get the target key node */
Node = (PCM_KEY_NODE)HvGetCell(Hive, TargetKey);
if (!Node) return FALSE;
/* Make sure it's dirty, then release it */
ASSERT(HvIsCellDirty(Hive, TargetKey));
HvReleaseCell(Hive, TargetKey);
/* Check if the name is compressed */
if (Node->Flags & KEY_COMP_NAME)
{
/* Remember for later */
IsCompressed = TRUE;
/* Build the search name */
SearchName.Length = CmpCompressedNameSize(Node->Name,
Node->NameLength);
SearchName.MaximumLength = SearchName.Length;
/* Do we need an extra bufer? */
if (SearchName.MaximumLength > sizeof(Buffer))
{
/* Allocate one */
SearchName.Buffer = CmpAllocate(SearchName.Length,
TRUE,
TAG_CM);
if (!SearchName.Buffer) return FALSE;
}
else
{
/* Otherwise, use our local stack buffer */
SearchName.Buffer = Buffer;
}
/* Copy the compressed name */
CmpCopyCompressedName(SearchName.Buffer,
SearchName.MaximumLength,
Node->Name,
Node->NameLength);
}
else
{
/* It's not compressed, build the name directly from the node */
IsCompressed = FALSE;
SearchName.Length = Node->NameLength;
SearchName.MaximumLength = Node->NameLength;
SearchName.Buffer = Node->Name;
}
/* Now get the parent node */
Node = (PCM_KEY_NODE)HvGetCell(Hive, ParentKey);
if (!Node) goto Exit;
/* Make sure it's dirty, then release it */
ASSERT(HvIsCellDirty(Hive, ParentKey));
HvReleaseCell(Hive, ParentKey);
/* Get the storage type and make sure it's not empty */
Storage = HvGetCellType(TargetKey);
ASSERT(Node->SubKeyCounts[Storage] != 0);
//ASSERT(HvIsCellAllocated(Hive, Node->SubKeyLists[Storage]));
/* Get the leaf cell now */
LeafCell = Node->SubKeyLists[Storage];
Leaf = (PCM_KEY_INDEX)HvGetCell(Hive, LeafCell);
if (!Leaf) goto Exit;
/* Remember to release it later */
CellToRelease1 = LeafCell;
/* Check if the leaf is a root */
if (Leaf->Signature == CM_KEY_INDEX_ROOT)
{
/* Find the child inside the root */
RootIndex = CmpFindSubKeyInRoot(Hive, Leaf, &SearchName, &ChildCell);
if (RootIndex & INVALID_INDEX) goto Exit;
ASSERT(ChildCell != FALSE);
/* The root cell is now this leaf */
Root = Leaf;
RootCell = LeafCell;
/* And the new leaf is now this child */
LeafCell = ChildCell;
Leaf = (PCM_KEY_INDEX)HvGetCell(Hive, LeafCell);
if (!Leaf) goto Exit;
/* Remember to release it later */
CellToRelease2 = LeafCell;
}
/* Make sure the leaf is valid */
ASSERT((Leaf->Signature == CM_KEY_INDEX_LEAF) ||
(Leaf->Signature == CM_KEY_FAST_LEAF) ||
(Leaf->Signature == CM_KEY_HASH_LEAF));
/* Now get the child in the leaf */
LeafIndex = CmpFindSubKeyInLeaf(Hive, Leaf, &SearchName, &ChildCell);
if (LeafIndex & INVALID_INDEX) goto Exit;
ASSERT(ChildCell != HCELL_NIL);
/* Decrement key counts and check if this was the last leaf entry */
Node->SubKeyCounts[Storage]--;
if (!(--Leaf->Count))
{
/* Free the leaf */
HvFreeCell(Hive, LeafCell);
/* Check if we were inside a root */
if (Root)
{
/* Decrease the root count too, since the leaf is going away */
if (!(--Root->Count))
{
/* The root is gone too,n ow */
HvFreeCell(Hive, RootCell);
Node->SubKeyLists[Storage] = HCELL_NIL;
}
else if (RootIndex < Root->Count)
{
/* Bring everything up by one */
RtlMoveMemory(&Root->List[RootIndex],
&Root->List[RootIndex + 1],
(Root->Count - RootIndex) * sizeof(HCELL_INDEX));
}
}
else
{
/* Otherwise, just clear the cell */
Node->SubKeyLists[Storage] = HCELL_NIL;
}
}
else if (LeafIndex < Leaf->Count)
{
/* Was the leaf a normal index? */
if (Leaf->Signature == CM_KEY_INDEX_LEAF)
{
/* Bring everything up by one */
RtlMoveMemory(&Leaf->List[LeafIndex],
&Leaf->List[LeafIndex + 1],
(Leaf->Count - LeafIndex) * sizeof(HCELL_INDEX));
}
else
{
/* This is a fast index, bring everything up by one */
Child = (PCM_KEY_FAST_INDEX)Leaf;
RtlMoveMemory(&Child->List[LeafIndex],
&Child->List[LeafIndex+1],
(Child->Count - LeafIndex) * sizeof(CM_INDEX));
}
}
/* If we got here, now we're done */
Result = TRUE;
Exit:
/* Release any cells we may have been holding */
if (CellToRelease1 != HCELL_NIL) HvReleaseCell(Hive, CellToRelease1);
if (CellToRelease2 != HCELL_NIL) HvReleaseCell(Hive, CellToRelease2);
/* Check if the name was compressed and not inside our local buffer */
if ((IsCompressed) && (SearchName.MaximumLength > sizeof(Buffer)))
{
/* Free the buffer we allocated */
CmpFree(SearchName.Buffer, 0);
}
/* Return the result */
return Result;
}
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