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386 lines
12 KiB
C
386 lines
12 KiB
C
/*
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* Atom table functions
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*
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* Copyright 1993, 1994, 1995, 2021 Alexandre Julliard
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* Copyright 2004,2005 Eric Pouech
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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 <stdlib.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include "ntstatus.h"
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#define WIN32_NO_STATUS
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#include "windef.h"
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#include "ntdll_misc.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(atom);
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#define MAX_ATOM_LEN 255
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#define MAX_ATOMS 0x4000
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#define IS_INTATOM(x) (((ULONG_PTR)(x) >> 16) == 0)
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#define TABLE_SIGNATURE 0x6d6f7441 /* 'Atom' */
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#define HASH_SIZE 37
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#define MIN_HASH_SIZE 4
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#define MAX_HASH_SIZE 0x200
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struct atom_handle
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{
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RTL_HANDLE hdr;
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RTL_ATOM_TABLE_ENTRY *entry;
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};
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static NTSTATUS lock_atom_table( RTL_ATOM_TABLE table )
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{
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if (!table) return STATUS_INVALID_PARAMETER;
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if (table->Signature != TABLE_SIGNATURE) return STATUS_INVALID_PARAMETER;
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RtlEnterCriticalSection( &table->CriticalSection );
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return STATUS_SUCCESS;
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}
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static void unlock_atom_table( RTL_ATOM_TABLE table )
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{
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RtlLeaveCriticalSection( &table->CriticalSection );
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}
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static ULONG hash_str( RTL_ATOM_TABLE table, const WCHAR *name, ULONG len )
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{
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UNICODE_STRING str = { len * sizeof(WCHAR), len * sizeof(WCHAR), (WCHAR *)name };
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ULONG hash;
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RtlHashUnicodeString( &str, TRUE, HASH_STRING_ALGORITHM_X65599, &hash );
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return hash % table->NumberOfBuckets;
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}
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static RTL_ATOM_TABLE_ENTRY *find_entry( RTL_ATOM_TABLE table, const WCHAR *name, ULONG len, ULONG hash )
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{
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RTL_ATOM_TABLE_ENTRY *entry = table->Buckets[hash];
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while (entry)
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{
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if (!RtlCompareUnicodeStrings( entry->Name, entry->NameLength, name, len, TRUE )) break;
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entry = entry->HashLink;
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}
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return entry;
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}
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static NTSTATUS add_atom( RTL_ATOM_TABLE table, const WCHAR *name, ULONG len, RTL_ATOM *atom )
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{
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RTL_ATOM_TABLE_ENTRY *entry;
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struct atom_handle *handle;
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ULONG index, hash = hash_str( table, name, len );
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if ((entry = find_entry( table, name, len, hash ))) /* exists already */
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{
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entry->ReferenceCount++;
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*atom = entry->Atom;
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return STATUS_SUCCESS;
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}
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if (!(handle = (struct atom_handle *)RtlAllocateHandle( &table->HandleTable, &index )))
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return STATUS_NO_MEMORY;
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if (!(entry = RtlAllocateHeap( GetProcessHeap(), 0, offsetof( RTL_ATOM_TABLE_ENTRY, Name[len] ) )))
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{
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RtlFreeHandle( &table->HandleTable, &handle->hdr );
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return STATUS_NO_MEMORY;
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}
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entry->HandleIndex = index;
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entry->Atom = MAXINTATOM + index;
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entry->ReferenceCount = 1;
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entry->Flags = 0;
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entry->NameLength = len;
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entry->HashLink = table->Buckets[hash];
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memcpy( entry->Name, name, len * sizeof(WCHAR) );
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handle->hdr.Next = (RTL_HANDLE *)1;
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table->Buckets[hash] = entry;
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handle->entry = entry;
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*atom = entry->Atom;
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return STATUS_SUCCESS;
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}
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/******************************************************************
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* is_integral_atom
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* Returns STATUS_SUCCESS if integral atom and 'pAtom' is filled
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* STATUS_INVALID_PARAMETER if 'atomstr' is too long
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* STATUS_MORE_ENTRIES otherwise
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*/
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static NTSTATUS is_integral_atom( LPCWSTR atomstr, size_t len, RTL_ATOM* pAtom )
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{
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RTL_ATOM atom;
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if (!IS_INTATOM( atomstr ))
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{
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const WCHAR* ptr = atomstr;
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if (!len) return STATUS_OBJECT_NAME_INVALID;
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if (*ptr++ == '#')
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{
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atom = 0;
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while (ptr < atomstr + len && *ptr >= '0' && *ptr <= '9')
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{
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atom = atom * 10 + *ptr++ - '0';
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}
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if (ptr > atomstr + 1 && ptr == atomstr + len) goto done;
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}
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if (len > MAX_ATOM_LEN) return STATUS_INVALID_PARAMETER;
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return STATUS_MORE_ENTRIES;
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}
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else atom = LOWORD( atomstr );
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done:
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if (!atom || atom >= MAXINTATOM) return STATUS_INVALID_PARAMETER;
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*pAtom = atom;
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return STATUS_SUCCESS;
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}
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/******************************************************************
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* RtlDeleteAtomFromAtomTable (NTDLL.@)
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*/
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NTSTATUS WINAPI RtlDeleteAtomFromAtomTable( RTL_ATOM_TABLE table, RTL_ATOM atom )
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{
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NTSTATUS status;
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struct atom_handle *handle;
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if ((status = lock_atom_table( table ))) return status;
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if (atom >= MAXINTATOM && RtlIsValidIndexHandle( &table->HandleTable, atom - MAXINTATOM,
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(RTL_HANDLE **)&handle ))
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{
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if (handle->entry->Flags) status = STATUS_WAS_LOCKED;
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else if (!--handle->entry->ReferenceCount)
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{
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ULONG hash = hash_str( table, handle->entry->Name, handle->entry->NameLength );
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RTL_ATOM_TABLE_ENTRY **ptr = &table->Buckets[hash];
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while (*ptr != handle->entry) ptr = &(*ptr)->HashLink;
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*ptr = (*ptr)->HashLink;
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RtlFreeHeap( GetProcessHeap(), 0, handle->entry );
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RtlFreeHandle( &table->HandleTable, &handle->hdr );
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}
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}
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else status = STATUS_INVALID_HANDLE;
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unlock_atom_table( table );
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TRACE( "%p %x\n", table, atom );
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return status;
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}
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/******************************************************************
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* integral_atom_name (internal)
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*
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* Helper for fetching integral (local/global) atoms names.
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*/
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static ULONG integral_atom_name(WCHAR* buffer, ULONG len, RTL_ATOM atom)
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{
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WCHAR tmp[16];
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int ret;
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ret = swprintf( tmp, ARRAY_SIZE(tmp), L"#%u", atom );
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if (!len) return ret * sizeof(WCHAR);
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if (len <= ret) ret = len - 1;
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memcpy( buffer, tmp, ret * sizeof(WCHAR) );
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buffer[ret] = 0;
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return ret * sizeof(WCHAR);
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}
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/******************************************************************
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* RtlQueryAtomInAtomTable (NTDLL.@)
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*/
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NTSTATUS WINAPI RtlQueryAtomInAtomTable( RTL_ATOM_TABLE table, RTL_ATOM atom, ULONG* ref,
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ULONG* pin, WCHAR* name, ULONG* len )
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{
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NTSTATUS status;
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struct atom_handle *handle;
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ULONG wlen = 0;
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if (!atom) return STATUS_INVALID_PARAMETER;
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if ((status = lock_atom_table( table ))) return status;
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if (atom < MAXINTATOM)
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{
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if (len) wlen = integral_atom_name( name, *len, atom);
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if (ref) *ref = 1;
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if (pin) *pin = 1;
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}
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else if (RtlIsValidIndexHandle( &table->HandleTable, atom - MAXINTATOM, (RTL_HANDLE **)&handle ))
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{
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wlen = handle->entry->NameLength * sizeof(WCHAR);
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if (ref) *ref = handle->entry->ReferenceCount;
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if (pin) *pin = handle->entry->Flags;
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if (len && *len)
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{
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wlen = min( *len - sizeof(WCHAR), wlen );
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if (name)
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{
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memcpy( name, handle->entry->Name, wlen );
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name[wlen / sizeof(WCHAR)] = 0;
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}
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}
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}
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else status = STATUS_INVALID_HANDLE;
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unlock_atom_table( table );
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if (status == STATUS_SUCCESS && len)
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{
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if (!*len) status = STATUS_BUFFER_TOO_SMALL;
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*len = wlen;
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}
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TRACE( "%p %x -> %s (%x)\n",
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table, atom, len ? debugstr_wn(name, wlen / sizeof(WCHAR)) : "(null)", status );
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return status;
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}
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/******************************************************************
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* RtlCreateAtomTable (NTDLL.@)
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*/
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NTSTATUS WINAPI RtlCreateAtomTable( ULONG size, RTL_ATOM_TABLE *ret_table )
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{
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RTL_ATOM_TABLE table;
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if (*ret_table) return size ? STATUS_INVALID_PARAMETER : STATUS_SUCCESS;
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if ((size < MIN_HASH_SIZE) || (size > MAX_HASH_SIZE)) size = HASH_SIZE;
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if (!(table = RtlAllocateHeap( GetProcessHeap(), HEAP_ZERO_MEMORY,
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offsetof( struct _RTL_ATOM_TABLE, Buckets[size] ))))
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return STATUS_NO_MEMORY;
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table->Signature = TABLE_SIGNATURE;
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table->NumberOfBuckets = size;
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RtlInitializeCriticalSection( &table->CriticalSection );
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RtlInitializeHandleTable( MAX_ATOMS, sizeof(struct atom_handle), &table->HandleTable );
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*ret_table = table;
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return STATUS_SUCCESS;
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}
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/******************************************************************
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* RtlDestroyAtomTable (NTDLL.@)
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*/
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NTSTATUS WINAPI RtlDestroyAtomTable( RTL_ATOM_TABLE table )
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{
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if (!table || table->Signature != TABLE_SIGNATURE) return STATUS_INVALID_PARAMETER;
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RtlDestroyHandleTable( &table->HandleTable );
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RtlDeleteCriticalSection( &table->CriticalSection );
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table->Signature = 0;
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RtlFreeHeap( GetProcessHeap(), 0, table );
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return STATUS_SUCCESS;
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}
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/******************************************************************
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* RtlAddAtomToAtomTable (NTDLL.@)
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*/
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NTSTATUS WINAPI RtlAddAtomToAtomTable( RTL_ATOM_TABLE table, const WCHAR* name, RTL_ATOM* atom )
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{
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NTSTATUS status;
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size_t len;
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if ((status = lock_atom_table( table ))) return status;
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len = IS_INTATOM( name ) ? 0 : wcslen( name );
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status = is_integral_atom( name, len, atom );
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if (status == STATUS_MORE_ENTRIES) status = add_atom( table, name, len, atom );
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unlock_atom_table( table );
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TRACE( "%p %s -> %x\n", table, debugstr_w(name), status == STATUS_SUCCESS ? *atom : 0 );
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return status;
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}
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/******************************************************************
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* RtlLookupAtomInAtomTable (NTDLL.@)
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*/
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NTSTATUS WINAPI RtlLookupAtomInAtomTable( RTL_ATOM_TABLE table, const WCHAR* name, RTL_ATOM* atom )
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{
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RTL_ATOM_TABLE_ENTRY *entry;
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NTSTATUS status;
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ULONG len;
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if ((status = lock_atom_table( table ))) return status;
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len = IS_INTATOM(name) ? 0 : wcslen(name);
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status = is_integral_atom( name, len, atom );
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if (status == STATUS_MORE_ENTRIES)
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{
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if ((entry = find_entry( table, name, len, hash_str( table, name, len ))))
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{
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*atom = entry->Atom;
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status = STATUS_SUCCESS;
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}
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else status = STATUS_OBJECT_NAME_NOT_FOUND;
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}
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unlock_atom_table( table );
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TRACE( "%p %s -> %x\n",
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table, debugstr_w(name), status == STATUS_SUCCESS ? *atom : 0 );
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return status;
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}
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/******************************************************************
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* RtlEmptyAtomTable (NTDLL.@)
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*/
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NTSTATUS WINAPI RtlEmptyAtomTable( RTL_ATOM_TABLE table, BOOLEAN delete_pinned )
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{
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struct atom_handle *handle;
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NTSTATUS status;
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ULONG i;
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if ((status = lock_atom_table( table ))) return status;
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for (i = 0; i < table->NumberOfBuckets; i++)
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{
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RTL_ATOM_TABLE_ENTRY **ptr = &table->Buckets[i];
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while (*ptr)
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{
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if (!delete_pinned && (*ptr)->Flags) ptr = &(*ptr)->HashLink;
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else
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{
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RTL_ATOM_TABLE_ENTRY *entry = *ptr;
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*ptr = entry->HashLink;
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if (RtlIsValidIndexHandle( &table->HandleTable, entry->HandleIndex,
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(RTL_HANDLE **)&handle ))
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RtlFreeHandle( &table->HandleTable, &handle->hdr );
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RtlFreeHeap( GetProcessHeap(), 0, entry );
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}
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}
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}
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unlock_atom_table( table );
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return STATUS_SUCCESS;
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}
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/******************************************************************
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* RtlPinAtomInAtomTable (NTDLL.@)
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*/
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NTSTATUS WINAPI RtlPinAtomInAtomTable( RTL_ATOM_TABLE table, RTL_ATOM atom )
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{
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struct atom_handle *handle;
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NTSTATUS status;
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if ((status = lock_atom_table( table ))) return status;
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if (atom >= MAXINTATOM && RtlIsValidIndexHandle( &table->HandleTable, atom - MAXINTATOM,
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(RTL_HANDLE **)&handle ))
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{
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handle->entry->Flags = 1;
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}
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unlock_atom_table( table );
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return STATUS_SUCCESS;
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}
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