756 lines
17 KiB
C
756 lines
17 KiB
C
/*++
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Copyright (c) 1997 Microsoft Corporation
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Module Name:
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cache.c
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Abstract:
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Implements a cache mechanism to speed up OpenRegKeyStr.
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Author:
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Jim Schmidt (jimschm) 11-Sep-2000
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Revisions:
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<alias> <date> <comments>
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--*/
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#include "pch.h"
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#include "regp.h"
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#define DBG_REG "Reg"
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typedef struct {
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HKEY Key;
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BOOL Unicode;
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UINT RefCount;
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UINT ClosesNeeded;
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REGSAM Sam;
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UINT KeyStringBytes;
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BYTE KeyString[];
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} REGKEYCACHE, *PREGKEYCACHE;
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typedef struct {
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HKEY Key;
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BOOL Unicode;
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UINT RefCount;
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UINT ClosesNeeded;
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REGSAM Sam;
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UINT KeyStringBytes;
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CHAR KeyString[MAX_REGISTRY_KEY];
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} WORKITEMA, *PWORKITEMA;
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typedef struct {
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HKEY Key;
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BOOL Unicode;
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UINT RefCount;
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UINT ClosesNeeded;
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REGSAM Sam;
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UINT KeyStringBytes;
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WCHAR KeyString[MAX_REGISTRY_KEY];
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} WORKITEMW, *PWORKITEMW;
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GROWLIST g_KeyCache = INIT_GROWLIST;
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UINT g_MaxCacheCount = 0;
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UINT g_CacheAddPos;
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CHAR g_LastParent[MAX_REGISTRY_KEY];
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UINT g_LastParentBytes;
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UINT g_LastParentUse;
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WCHAR g_LastParentW[MAX_REGISTRY_KEY];
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UINT g_LastParentBytesW;
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UINT g_LastParentUseW;
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BOOL
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pRemoveItemFromCache (
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IN UINT Item
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);
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//
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// Implementation
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//
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VOID
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RegInitializeCache (
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IN UINT InitialCacheSize
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)
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{
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if (InitialCacheSize > 64) {
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InitialCacheSize = 64;
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}
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g_MaxCacheCount = InitialCacheSize;
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g_CacheAddPos = 0;
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g_LastParentUse = 0;
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g_LastParentUseW = 0;
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}
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VOID
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RegTerminateCache (
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VOID
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)
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{
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UINT u;
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UINT count;
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count = GlGetSize (&g_KeyCache);
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for (u = 0 ; u < count ; u++) {
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pRemoveItemFromCache (u);
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}
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GlFree (&g_KeyCache);
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g_MaxCacheCount = 0;
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g_LastParentUse = 0;
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g_LastParentUseW = 0;
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}
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BOOL
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pRemoveItemFromCache (
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IN UINT Item
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)
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{
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PREGKEYCACHE cacheItem;
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cacheItem = (PREGKEYCACHE) GlGetItem (&g_KeyCache, Item);
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if (!cacheItem) {
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return TRUE;
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}
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if (cacheItem->RefCount == 0) {
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while (cacheItem->ClosesNeeded) {
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CloseRegKeyWorker (cacheItem->Key);
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cacheItem->ClosesNeeded--;
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}
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return TRUE;
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} else {
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return FALSE;
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}
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}
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VOID
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RegRecordParentInCacheA (
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IN PCSTR KeyString,
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IN PCSTR StringEnd
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)
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{
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HKEY key;
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UINT byteCount;
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CHAR lowerStr[MAX_REGISTRY_KEY];
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HKEY rootKey;
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UINT end;
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if (!g_MaxCacheCount) {
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return;
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}
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if (StringEnd <= KeyString) {
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return;
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}
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byteCount = (UINT) (HALF_PTR) ((PBYTE) StringEnd - (PBYTE) KeyString);
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if (byteCount >= (MAX_REGISTRY_KEY * sizeof (CHAR))) {
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return;
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}
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if (g_LastParentUse && g_LastParentUse < 3 && g_LastParentBytes == byteCount) {
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StringCopyABA (lowerStr, KeyString, StringEnd);
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CharLowerA (lowerStr);
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if (StringMatchA (g_LastParent, lowerStr)) {
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g_LastParentUse++;
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if (g_LastParentUse == 3) {
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//
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// Stimulate the cache
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//
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rootKey = ConvertRootStringToKeyA (lowerStr, &end);
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if (rootKey) {
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if (lowerStr[end]) {
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#ifdef DEBUG
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key = OpenRegKeyWorkerA (rootKey, &lowerStr[end], __FILE__, __LINE__);
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#else
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key = OpenRegKeyWorkerA (rootKey, &lowerStr[end]);
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#endif
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if (key) {
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RegAddKeyToCacheA (lowerStr, key, g_OpenSam);
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CloseRegKey (key);
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}
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}
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}
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}
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return;
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}
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}
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StringCopyABA (g_LastParent, KeyString, StringEnd);
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CharLowerA (g_LastParent);
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g_LastParentBytes = byteCount;
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g_LastParentUse = 1;
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}
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HKEY
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RegGetKeyFromCacheA (
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IN PCSTR KeyString,
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IN PCSTR KeyEnd, OPTIONAL
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IN REGSAM Sam,
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IN BOOL IncRefCount
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)
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{
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UINT stringBytes;
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PCSTR end;
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CHAR lowerStr[MAX_REGISTRY_KEY];
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UINT u;
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UINT count;
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PREGKEYCACHE cacheItem;
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count = GlGetSize (&g_KeyCache);
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if (!count) {
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return NULL;
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}
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if (!KeyEnd) {
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end = StackStringCopyA (lowerStr, KeyString);
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} else {
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if (KeyEnd > KeyString + MAX_REGISTRY_KEY) {
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KeyEnd = KeyString + MAX_REGISTRY_KEY;
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}
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end = StringCopyABA (lowerStr, KeyString, KeyEnd);
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}
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CharLowerA (lowerStr);
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stringBytes = (UINT) (HALF_PTR) ((PBYTE) end - (PBYTE) lowerStr);
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//
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// Scan the cache sequentially (it should be small), and return a match
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// if one is found. Stored strings are always in lower case.
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//
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u = g_CacheAddPos;
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do {
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cacheItem = (PREGKEYCACHE) GlGetItem (&g_KeyCache, u);
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if (!cacheItem) {
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return NULL;
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}
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if ((cacheItem->KeyStringBytes == stringBytes) &&
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(!cacheItem->Unicode) &&
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((cacheItem->Sam & Sam) == Sam) &&
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(StringMatchA ((PCSTR) cacheItem->KeyString, lowerStr))
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) {
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if (IncRefCount) {
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cacheItem->RefCount++;
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}
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return cacheItem->Key;
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}
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u++;
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if (u >= count) {
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u = 0;
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}
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} while (u != g_CacheAddPos);
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return NULL;
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}
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VOID
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RegAddKeyToCacheA (
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IN PCSTR KeyString,
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IN HKEY Key,
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IN REGSAM Sam
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)
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{
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PREGKEYCACHE cacheItem;
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PREGKEYCACHE lastAddItem;
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WORKITEMA workItem;
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PCSTR end;
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UINT minStructSize;
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UINT pos;
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UINT count;
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UINT u;
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if (!g_MaxCacheCount || !Key) {
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return;
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}
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//
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// Scan the cache for the existing Key
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//
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count = GlGetSize (&g_KeyCache);
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for (u = 0 ; u < count ; u++) {
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cacheItem = (PREGKEYCACHE) GlGetItem (&g_KeyCache, u);
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if (cacheItem->Key == Key) {
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cacheItem->RefCount++;
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g_CacheAddPos = u;
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cacheItem->Sam |= Sam;
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if (cacheItem->KeyStringBytes == 0 && *KeyString && !cacheItem->Unicode) {
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//
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// This key was added before we knew the name. Update the name
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// now.
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//
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DEBUGMSG ((DBG_REG, "Updating empty-named key %s", KeyString));
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minStructSize = sizeof (workItem) - sizeof (workItem.KeyString);
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CopyMemory (&workItem, cacheItem, minStructSize);
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end = StackStringCopyA (workItem.KeyString, KeyString);
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CharLowerA (workItem.KeyString);
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workItem.KeyStringBytes = (UINT) (HALF_PTR) ((PBYTE) end - (PBYTE) workItem.KeyString);
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workItem.ClosesNeeded++;
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minStructSize += workItem.KeyStringBytes + sizeof (CHAR);
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GlSetItem (&g_KeyCache, u, (PBYTE) &workItem, minStructSize);
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} else if (*KeyString == 0) {
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cacheItem->ClosesNeeded++;
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}
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return;
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}
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}
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//
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// Create the new cache item
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//
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workItem.Key = Key;
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workItem.Unicode = FALSE;
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workItem.RefCount = 1;
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workItem.ClosesNeeded = 1;
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workItem.Sam = Sam;
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end = StackStringCopyA (workItem.KeyString, KeyString);
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CharLowerA (workItem.KeyString);
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workItem.KeyStringBytes = (UINT) (HALF_PTR) ((PBYTE) end - (PBYTE) workItem.KeyString);
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minStructSize = sizeof (workItem) - sizeof (workItem.KeyString) + workItem.KeyStringBytes + sizeof (CHAR);
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//
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// Put work item into grow list
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//
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if (count < g_MaxCacheCount) {
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g_CacheAddPos = count;
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GlAppend (&g_KeyCache, (PBYTE) &workItem, minStructSize);
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} else {
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//
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// Look for a closed key to discard. If cache is too full, then
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// increase the cache size. If the cache size hits 64, then don't
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// cache this add.
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//
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lastAddItem = (PREGKEYCACHE) GlGetItem (&g_KeyCache, g_CacheAddPos);
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if (lastAddItem) {
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for (pos = 0 ; pos < count ; pos++) {
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if (pos == g_CacheAddPos) {
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continue;
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}
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cacheItem = (PREGKEYCACHE) GlGetItem (&g_KeyCache, pos);
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if (cacheItem->KeyStringBytes >= lastAddItem->KeyStringBytes) {
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break;
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}
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if (cacheItem->Unicode) {
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continue;
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}
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if (cacheItem->RefCount) {
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continue;
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}
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if (!StringPrefixA ((PCSTR) lastAddItem->KeyString, (PCSTR) cacheItem->KeyString)) {
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break;
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}
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}
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if (pos == count) {
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if (g_MaxCacheCount == 64) {
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DEBUGMSG ((DBG_REG, "Cache is full of open keys"));
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return;
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}
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g_MaxCacheCount++;
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GlAppend (&g_KeyCache, (PBYTE) &workItem, minStructSize);
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} else {
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pRemoveItemFromCache (pos);
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GlSetItem (&g_KeyCache, pos, (PBYTE) &workItem, minStructSize);
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}
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g_CacheAddPos = pos;
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}
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}
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}
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BOOL
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RegDecrementRefCount (
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IN HKEY Key
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)
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{
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UINT u;
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UINT count;
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PREGKEYCACHE cacheItem;
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if (!g_MaxCacheCount) {
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return FALSE;
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}
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count = GlGetSize (&g_KeyCache);
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for (u = 0 ; u < count ; u++) {
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cacheItem = (PREGKEYCACHE) GlGetItem (&g_KeyCache, u);
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if (cacheItem->Key == Key) {
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if (cacheItem->RefCount == 0) {
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//
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// The caller is tried to close the key more times than what
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// it was opened.
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//
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if (cacheItem->Unicode) {
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DEBUGMSGW ((
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DBG_WHOOPS,
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"Reg key %s ref count == 0; trying to close it too many times",
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cacheItem->KeyString
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));
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} else {
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DEBUGMSGA ((
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DBG_WHOOPS,
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"Reg key %s ref count == 0; trying to close it too many times",
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cacheItem->KeyString
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));
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}
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} else {
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cacheItem->RefCount--;
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}
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//
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// Return TRUE to postpone the close
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//
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return TRUE;
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}
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}
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return FALSE;
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}
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VOID
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RegRecordParentInCacheW (
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IN PCWSTR KeyString,
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IN PCWSTR StringEnd
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)
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{
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HKEY key;
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UINT byteCount;
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WCHAR lowerStr[MAX_REGISTRY_KEY];
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HKEY rootKey;
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UINT end;
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if (!g_MaxCacheCount) {
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return;
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}
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if (StringEnd <= KeyString) {
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return;
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}
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byteCount = (UINT) (HALF_PTR) ((PBYTE) StringEnd - (PBYTE) KeyString);
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if (byteCount >= (MAX_REGISTRY_KEY * sizeof (WCHAR))) {
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return;
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}
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if (g_LastParentUseW && g_LastParentUseW < 3 && g_LastParentBytesW == byteCount) {
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StringCopyABW (lowerStr, KeyString, StringEnd);
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CharLowerW (lowerStr);
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if (StringMatchW (g_LastParentW, lowerStr)) {
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g_LastParentUseW++;
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if (g_LastParentUseW == 3) {
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//
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// Stimulate the cache
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//
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rootKey = ConvertRootStringToKeyW (lowerStr, &end);
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if (rootKey) {
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if (lowerStr[end]) {
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#ifdef DEBUG
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key = OpenRegKeyWorkerW (rootKey, &lowerStr[end], __FILE__, __LINE__);
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#else
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key = OpenRegKeyWorkerW (rootKey, &lowerStr[end]);
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#endif
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if (key) {
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RegAddKeyToCacheW (lowerStr, key, g_OpenSam);
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CloseRegKey (key);
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}
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}
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}
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}
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return;
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}
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}
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StringCopyABW (g_LastParentW, KeyString, StringEnd);
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CharLowerW (g_LastParentW);
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g_LastParentBytesW = byteCount;
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g_LastParentUseW = 1;
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}
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HKEY
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RegGetKeyFromCacheW (
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IN PCWSTR KeyString,
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IN PCWSTR KeyEnd, OPTIONAL
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IN REGSAM Sam,
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IN BOOL IncRefCount
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)
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{
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UINT stringBytes;
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PCWSTR end;
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WCHAR lowerStr[MAX_REGISTRY_KEY];
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UINT u;
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UINT count;
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PREGKEYCACHE cacheItem;
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count = GlGetSize (&g_KeyCache);
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if (!count) {
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return NULL;
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}
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if (!KeyEnd) {
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end = StackStringCopyW (lowerStr, KeyString);
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} else {
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if (KeyEnd > KeyString + MAX_REGISTRY_KEY) {
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KeyEnd = KeyString + MAX_REGISTRY_KEY;
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}
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end = StringCopyABW (lowerStr, KeyString, KeyEnd);
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}
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CharLowerW (lowerStr);
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stringBytes = (UINT) (HALF_PTR) ((PBYTE) end - (PBYTE) lowerStr);
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//
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// Scan the cache sequentially (it should be small), and return a match
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// if one is found. Stored strings are always in lower case.
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//
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u = g_CacheAddPos;
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do {
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cacheItem = (PREGKEYCACHE) GlGetItem (&g_KeyCache, u);
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if (!cacheItem) {
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return NULL;
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}
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if ((cacheItem->KeyStringBytes == stringBytes) &&
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(cacheItem->Unicode) &&
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((cacheItem->Sam & Sam) == Sam) &&
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(StringMatchW ((PCWSTR) cacheItem->KeyString, lowerStr))
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) {
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if (IncRefCount) {
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cacheItem->RefCount++;
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}
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return cacheItem->Key;
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}
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u++;
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if (u >= count) {
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u = 0;
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}
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} while (u != g_CacheAddPos);
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return NULL;
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}
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VOID
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RegAddKeyToCacheW (
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IN PCWSTR KeyString,
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IN HKEY Key,
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IN REGSAM Sam
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)
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{
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PREGKEYCACHE cacheItem;
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PREGKEYCACHE lastAddItem;
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WORKITEMW workItem;
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PCWSTR end;
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UINT minStructSize;
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UINT pos;
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UINT count;
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UINT u;
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if (!g_MaxCacheCount || !Key) {
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return;
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}
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//
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// Scan the cache for the existing Key
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//
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count = GlGetSize (&g_KeyCache);
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for (u = 0 ; u < count ; u++) {
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|
cacheItem = (PREGKEYCACHE) GlGetItem (&g_KeyCache, u);
|
|
|
|
if (cacheItem->Key == Key) {
|
|
cacheItem->RefCount++;
|
|
|
|
g_CacheAddPos = u;
|
|
cacheItem->Sam |= Sam;
|
|
|
|
if (cacheItem->KeyStringBytes == 0 && *KeyString && cacheItem->Unicode) {
|
|
|
|
//
|
|
// This key was added before we knew the name. Update the name
|
|
// now.
|
|
//
|
|
|
|
minStructSize = sizeof (workItem) - sizeof (workItem.KeyString);
|
|
CopyMemory (&workItem, cacheItem, minStructSize);
|
|
|
|
end = StackStringCopyW (workItem.KeyString, KeyString);
|
|
CharLowerW (workItem.KeyString);
|
|
workItem.KeyStringBytes = (UINT) (HALF_PTR) ((PBYTE) end - (PBYTE) workItem.KeyString);
|
|
workItem.ClosesNeeded++;
|
|
|
|
minStructSize += workItem.KeyStringBytes + sizeof (WCHAR);
|
|
GlSetItem (&g_KeyCache, u, (PBYTE) &workItem, minStructSize);
|
|
|
|
} else if (*KeyString == 0) {
|
|
cacheItem->ClosesNeeded++;
|
|
}
|
|
|
|
return;
|
|
}
|
|
}
|
|
|
|
//
|
|
// Create the new cache item
|
|
//
|
|
|
|
workItem.Key = Key;
|
|
workItem.Unicode = TRUE;
|
|
workItem.RefCount = 1;
|
|
workItem.ClosesNeeded = 1;
|
|
workItem.Sam = Sam;
|
|
end = StackStringCopyW (workItem.KeyString, KeyString);
|
|
CharLowerW (workItem.KeyString);
|
|
workItem.KeyStringBytes = (UINT) (HALF_PTR) ((PBYTE) end - (PBYTE) workItem.KeyString);
|
|
|
|
minStructSize = sizeof (workItem) - sizeof (workItem.KeyString) + workItem.KeyStringBytes + sizeof (WCHAR);
|
|
|
|
//
|
|
// Put work item into grow list
|
|
//
|
|
|
|
if (count < g_MaxCacheCount) {
|
|
g_CacheAddPos = count;
|
|
GlAppend (&g_KeyCache, (PBYTE) &workItem, minStructSize);
|
|
} else {
|
|
|
|
//
|
|
// Look for a closed key to discard. If cache is too full, then
|
|
// increase the cache size. If the cache size hits 64, then don't
|
|
// cache this add.
|
|
//
|
|
|
|
lastAddItem = (PREGKEYCACHE) GlGetItem (&g_KeyCache, g_CacheAddPos);
|
|
|
|
if (lastAddItem) {
|
|
|
|
for (pos = 0 ; pos < count ; pos++) {
|
|
if (pos == g_CacheAddPos) {
|
|
continue;
|
|
}
|
|
|
|
cacheItem = (PREGKEYCACHE) GlGetItem (&g_KeyCache, pos);
|
|
if (cacheItem->KeyStringBytes >= lastAddItem->KeyStringBytes) {
|
|
break;
|
|
}
|
|
|
|
if (!cacheItem->Unicode) {
|
|
continue;
|
|
}
|
|
|
|
if (cacheItem->RefCount) {
|
|
continue;
|
|
}
|
|
|
|
if (!StringPrefixW ((PCWSTR) lastAddItem->KeyString, (PCWSTR) cacheItem->KeyString)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (pos == count) {
|
|
if (g_MaxCacheCount == 64) {
|
|
DEBUGMSG ((DBG_REG, "Cache is full of open keys"));
|
|
return;
|
|
}
|
|
|
|
g_MaxCacheCount++;
|
|
GlAppend (&g_KeyCache, (PBYTE) &workItem, minStructSize);
|
|
|
|
} else {
|
|
pRemoveItemFromCache (pos);
|
|
GlSetItem (&g_KeyCache, pos, (PBYTE) &workItem, minStructSize);
|
|
}
|
|
|
|
g_CacheAddPos = pos;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|