318 lines
8.9 KiB
C
318 lines
8.9 KiB
C
/*
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* Copyright 2006 Juan Lang
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <assert.h>
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#include <stdarg.h>
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#include "windef.h"
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#include "winbase.h"
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#include "wincrypt.h"
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#include "wine/debug.h"
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#include "wine/list.h"
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#include "crypt32_private.h"
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WINE_DEFAULT_DEBUG_CHANNEL(crypt);
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typedef enum _ContextType {
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ContextTypeData,
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ContextTypeLink,
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} ContextType;
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typedef struct _BASE_CONTEXT
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{
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LONG ref;
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ContextType type;
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} BASE_CONTEXT, *PBASE_CONTEXT;
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typedef struct _DATA_CONTEXT
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{
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LONG ref;
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ContextType type; /* always ContextTypeData */
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PCONTEXT_PROPERTY_LIST properties;
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} DATA_CONTEXT, *PDATA_CONTEXT;
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typedef struct _LINK_CONTEXT
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{
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LONG ref;
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ContextType type; /* always ContextTypeLink */
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PBASE_CONTEXT linked;
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} LINK_CONTEXT, *PLINK_CONTEXT;
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#define CONTEXT_FROM_BASE_CONTEXT(p, s) ((LPBYTE)(p) - (s))
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#define BASE_CONTEXT_FROM_CONTEXT(p, s) (PBASE_CONTEXT)((LPBYTE)(p) + (s))
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void *Context_CreateDataContext(size_t contextSize)
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{
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void *ret = CryptMemAlloc(contextSize + sizeof(DATA_CONTEXT));
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if (ret)
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{
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PDATA_CONTEXT context = (PDATA_CONTEXT)((LPBYTE)ret + contextSize);
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context->ref = 1;
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context->type = ContextTypeData;
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context->properties = ContextPropertyList_Create();
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if (!context->properties)
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{
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CryptMemFree(ret);
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ret = NULL;
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}
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}
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TRACE("returning %p\n", ret);
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return ret;
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}
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void *Context_CreateLinkContext(unsigned int contextSize, void *linked, unsigned int extra,
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BOOL addRef)
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{
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void *context = CryptMemAlloc(contextSize + sizeof(LINK_CONTEXT) + extra);
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TRACE("(%d, %p, %d)\n", contextSize, linked, extra);
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if (context)
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{
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PLINK_CONTEXT linkContext = (PLINK_CONTEXT)BASE_CONTEXT_FROM_CONTEXT(
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context, contextSize);
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PBASE_CONTEXT linkedBase = BASE_CONTEXT_FROM_CONTEXT(linked,
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contextSize);
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memcpy(context, linked, contextSize);
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linkContext->ref = 1;
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linkContext->type = ContextTypeLink;
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linkContext->linked = linkedBase;
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if (addRef)
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InterlockedIncrement(&linkedBase->ref);
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TRACE("%p's ref count is %d\n", context, linkContext->ref);
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}
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TRACE("returning %p\n", context);
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return context;
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}
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void Context_AddRef(void *context, size_t contextSize)
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{
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PBASE_CONTEXT baseContext = BASE_CONTEXT_FROM_CONTEXT(context, contextSize);
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InterlockedIncrement(&baseContext->ref);
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}
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void *Context_GetExtra(const void *context, size_t contextSize)
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{
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PBASE_CONTEXT baseContext = BASE_CONTEXT_FROM_CONTEXT(context, contextSize);
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assert(baseContext->type == ContextTypeLink);
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return (LPBYTE)baseContext + sizeof(LINK_CONTEXT);
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}
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void *Context_GetLinkedContext(void *context, size_t contextSize)
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{
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PBASE_CONTEXT baseContext = BASE_CONTEXT_FROM_CONTEXT(context, contextSize);
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assert(baseContext->type == ContextTypeLink);
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return CONTEXT_FROM_BASE_CONTEXT(((PLINK_CONTEXT)baseContext)->linked,
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contextSize);
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}
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PCONTEXT_PROPERTY_LIST Context_GetProperties(const void *context, size_t contextSize)
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{
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PBASE_CONTEXT ptr = BASE_CONTEXT_FROM_CONTEXT(context, contextSize);
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while (ptr && ptr->type == ContextTypeLink)
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ptr = ((PLINK_CONTEXT)ptr)->linked;
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return (ptr && ptr->type == ContextTypeData) ?
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((PDATA_CONTEXT)ptr)->properties : NULL;
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}
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BOOL Context_Release(void *context, size_t contextSize,
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ContextFreeFunc dataContextFree)
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{
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PBASE_CONTEXT base = BASE_CONTEXT_FROM_CONTEXT(context, contextSize);
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BOOL ret = TRUE;
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if (base->ref <= 0)
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return FALSE;
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if (InterlockedDecrement(&base->ref) == 0)
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{
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TRACE("freeing %p\n", context);
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switch (base->type)
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{
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case ContextTypeData:
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ContextPropertyList_Free(((PDATA_CONTEXT)base)->properties);
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dataContextFree(context);
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break;
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case ContextTypeLink:
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/* The linked context is of the same type as this, so release
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* it as well, using the same offset and data free function.
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*/
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ret = Context_Release(CONTEXT_FROM_BASE_CONTEXT(
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((PLINK_CONTEXT)base)->linked, contextSize), contextSize,
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dataContextFree);
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break;
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default:
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assert(0);
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}
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CryptMemFree(context);
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}
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else
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TRACE("%p's ref count is %d\n", context, base->ref);
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return ret;
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}
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void Context_CopyProperties(const void *to, const void *from,
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size_t contextSize)
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{
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PCONTEXT_PROPERTY_LIST toProperties, fromProperties;
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toProperties = Context_GetProperties(to, contextSize);
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fromProperties = Context_GetProperties(from, contextSize);
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assert(toProperties && fromProperties);
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ContextPropertyList_Copy(toProperties, fromProperties);
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}
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struct ContextList
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{
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PCWINE_CONTEXT_INTERFACE contextInterface;
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size_t contextSize;
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CRITICAL_SECTION cs;
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struct list contexts;
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};
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struct ContextList *ContextList_Create(
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PCWINE_CONTEXT_INTERFACE contextInterface, size_t contextSize)
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{
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struct ContextList *list = CryptMemAlloc(sizeof(struct ContextList));
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if (list)
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{
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list->contextInterface = contextInterface;
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list->contextSize = contextSize;
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InitializeCriticalSection(&list->cs);
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list->cs.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": ContextList.cs");
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list_init(&list->contexts);
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}
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return list;
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}
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static inline struct list *ContextList_ContextToEntry(const struct ContextList *list,
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const void *context)
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{
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struct list *ret;
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if (context)
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ret = Context_GetExtra(context, list->contextSize);
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else
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ret = NULL;
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return ret;
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}
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static inline void *ContextList_EntryToContext(const struct ContextList *list,
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struct list *entry)
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{
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return (LPBYTE)entry - sizeof(LINK_CONTEXT) - list->contextSize;
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}
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void *ContextList_Add(struct ContextList *list, void *toLink, void *toReplace)
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{
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void *context;
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TRACE("(%p, %p, %p)\n", list, toLink, toReplace);
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context = Context_CreateLinkContext(list->contextSize, toLink,
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sizeof(struct list), TRUE);
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if (context)
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{
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struct list *entry = ContextList_ContextToEntry(list, context);
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TRACE("adding %p\n", context);
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EnterCriticalSection(&list->cs);
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if (toReplace)
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{
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struct list *existing = ContextList_ContextToEntry(list, toReplace);
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entry->prev = existing->prev;
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entry->next = existing->next;
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entry->prev->next = entry;
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entry->next->prev = entry;
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existing->prev = existing->next = existing;
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list->contextInterface->free(toReplace);
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}
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else
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list_add_head(&list->contexts, entry);
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LeaveCriticalSection(&list->cs);
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}
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return context;
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}
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void *ContextList_Enum(struct ContextList *list, void *pPrev)
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{
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struct list *listNext;
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void *ret;
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EnterCriticalSection(&list->cs);
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if (pPrev)
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{
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struct list *prevEntry = ContextList_ContextToEntry(list, pPrev);
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listNext = list_next(&list->contexts, prevEntry);
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list->contextInterface->free(pPrev);
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}
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else
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listNext = list_next(&list->contexts, &list->contexts);
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LeaveCriticalSection(&list->cs);
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if (listNext)
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{
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ret = ContextList_EntryToContext(list, listNext);
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list->contextInterface->duplicate(ret);
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}
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else
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ret = NULL;
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return ret;
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}
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void ContextList_Delete(struct ContextList *list, void *context)
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{
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struct list *entry = ContextList_ContextToEntry(list, context);
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EnterCriticalSection(&list->cs);
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list_remove(entry);
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LeaveCriticalSection(&list->cs);
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list->contextInterface->free(context);
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}
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static void ContextList_Empty(struct ContextList *list)
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{
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struct list *entry, *next;
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EnterCriticalSection(&list->cs);
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LIST_FOR_EACH_SAFE(entry, next, &list->contexts)
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{
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const void *context = ContextList_EntryToContext(list, entry);
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TRACE("removing %p\n", context);
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list_remove(entry);
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list->contextInterface->free(context);
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}
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LeaveCriticalSection(&list->cs);
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}
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void ContextList_Free(struct ContextList *list)
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{
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ContextList_Empty(list);
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list->cs.DebugInfo->Spare[0] = 0;
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DeleteCriticalSection(&list->cs);
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CryptMemFree(list);
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}
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