marko10_000
/
wine-wine
forked from Mirrors/wine-wine
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
wine-wine/dlls/krnl386.exe16/atom.c

354 lines
9.4 KiB
C
Raw Permalink Blame History

/*
* Atom table functions - 16 bit variant
*
* Copyright 1993, 1994, 1995 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
/*
* Warning: The code assumes that LocalAlloc() returns a block aligned
* on a 4-bytes boundary (because of the shifting done in
* HANDLETOATOM). If this is not the case, the allocation code will
* have to be changed.
*/
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "windef.h"
#include "winbase.h"
#include "winerror.h"
#include "winternl.h"
#include "wine/winbase16.h"
#include "kernel16_private.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(atom);
#define DEFAULT_ATOMTABLE_SIZE 37
#define MAX_ATOM_LEN 255
#define ATOMTOHANDLE(atom) ((HANDLE16)(atom) << 2)
#define HANDLETOATOM(handle) ((ATOM)(0xc000 | ((handle) >> 2)))
typedef struct
{
HANDLE16 next;
WORD refCount;
BYTE length;
CHAR str[1];
} ATOMENTRY;
typedef struct
{
WORD size;
HANDLE16 entries[1];
} ATOMTABLE;
/***********************************************************************
* ATOM_GetTable
*
* Return a pointer to the atom table of a given segment, creating
* it if necessary.
*
* RETURNS
* Pointer to table: Success
* NULL: Failure
*/
static ATOMTABLE *ATOM_GetTable( BOOL create /* [in] Create */ )
{
INSTANCEDATA *ptr = MapSL( MAKESEGPTR( CURRENT_DS, 0 ) );
if (ptr->atomtable)
{
ATOMTABLE *table = (ATOMTABLE *)((char *)ptr + ptr->atomtable);
if (table->size) return table;
}
if (!create) return NULL;
if (!InitAtomTable16( 0 )) return NULL;
/* Reload ptr in case it moved in linear memory */
ptr = MapSL( MAKESEGPTR( CURRENT_DS, 0 ) );
return (ATOMTABLE *)((char *)ptr + ptr->atomtable);
}
/***********************************************************************
* ATOM_Hash
* RETURNS
* The hash value for the input string
*/
static WORD ATOM_Hash(
WORD entries, /* [in] Total number of entries */
LPCSTR str, /* [in] Pointer to string to hash */
WORD len /* [in] Length of string */
) {
WORD i, hash = 0;
TRACE("%x, %s, %x\n", entries, str, len);
for (i = 0; i < len; i++) hash ^= RtlUpperChar(str[i]) + i;
return hash % entries;
}
/***********************************************************************
* ATOM_IsIntAtomA
*/
static BOOL ATOM_IsIntAtomA(LPCSTR atomstr,WORD *atomid)
{
UINT atom = 0;
if (!HIWORD(atomstr)) atom = LOWORD(atomstr);
else
{
if (*atomstr++ != '#') return FALSE;
while (*atomstr >= '0' && *atomstr <= '9')
{
atom = atom * 10 + *atomstr - '0';
atomstr++;
}
if (*atomstr) return FALSE;
}
if (atom >= MAXINTATOM)
{
SetLastError( ERROR_INVALID_PARAMETER );
atom = 0;
}
*atomid = atom;
return TRUE;
}
/***********************************************************************
* ATOM_MakePtr
*
* Make an ATOMENTRY pointer from a handle (obtained from GetAtomHandle()).
*/
static inline ATOMENTRY *ATOM_MakePtr( HANDLE16 handle /* [in] Handle */ )
{
return MapSL( MAKESEGPTR( CURRENT_DS, handle ) );
}
/***********************************************************************
* InitAtomTable (KERNEL.68)
*/
WORD WINAPI InitAtomTable16( WORD entries )
{
int i;
HANDLE16 handle;
ATOMTABLE *table;
/* Allocate the table */
if (!entries) entries = DEFAULT_ATOMTABLE_SIZE; /* sanity check */
handle = LocalAlloc16( LMEM_FIXED, FIELD_OFFSET( ATOMTABLE, entries[entries] ));
if (!handle) return 0;
table = MapSL( MAKESEGPTR( CURRENT_DS, handle ) );
table->size = entries;
for (i = 0; i < entries; i++) table->entries[i] = 0;
/* Store a pointer to the table in the instance data */
((INSTANCEDATA *)MapSL( MAKESEGPTR( CURRENT_DS, 0 )))->atomtable = handle;
return handle;
}
/***********************************************************************
* GetAtomHandle (KERNEL.73)
*/
HANDLE16 WINAPI GetAtomHandle16( ATOM atom )
{
if (atom < MAXINTATOM) return 0;
return ATOMTOHANDLE( atom );
}
/***********************************************************************
* AddAtom (KERNEL.70)
*
* Windows DWORD aligns the atom entry size.
* The remaining unused string space created by the alignment
* gets padded with '\0's in a certain way to ensure
* that at least one trailing '\0' remains.
*
* RETURNS
* Atom: Success
* 0: Failure
*/
ATOM WINAPI AddAtom16( LPCSTR str )
{
char buffer[MAX_ATOM_LEN+1];
WORD hash;
HANDLE16 entry;
ATOMENTRY * entryPtr;
ATOMTABLE * table;
int len, ae_len;
WORD iatom;
if (ATOM_IsIntAtomA( str, &iatom )) return iatom;
TRACE("%s\n",debugstr_a(str));
if (!(table = ATOM_GetTable( TRUE ))) return 0;
/* Make a copy of the string to be sure it doesn't move in linear memory. */
lstrcpynA( buffer, str, sizeof(buffer) );
len = strlen( buffer );
hash = ATOM_Hash( table->size, buffer, len );
entry = table->entries[hash];
while (entry)
{
entryPtr = ATOM_MakePtr( entry );
if ((entryPtr->length == len) &&
(!_strnicmp( entryPtr->str, buffer, len )))
{
entryPtr->refCount++;
TRACE("-- existing 0x%x\n", entry);
return HANDLETOATOM( entry );
}
entry = entryPtr->next;
}
ae_len = (sizeof(ATOMENTRY)+len+3) & ~3;
entry = LocalAlloc16( LMEM_FIXED, ae_len );
if (!entry) return 0;
/* Reload the table ptr in case it moved in linear memory */
table = ATOM_GetTable( FALSE );
entryPtr = ATOM_MakePtr( entry );
entryPtr->next = table->entries[hash];
entryPtr->refCount = 1;
entryPtr->length = len;
memcpy( entryPtr->str, buffer, len);
/* Some applications _need_ the '\0' padding provided by memset */
/* Note that 1 byte of the str is accounted for in the ATOMENTRY struct */
memset( entryPtr->str+len, 0, ae_len - sizeof(ATOMENTRY) - (len - 1));
table->entries[hash] = entry;
TRACE("-- new 0x%x\n", entry);
return HANDLETOATOM( entry );
}
/***********************************************************************
* DeleteAtom (KERNEL.71)
*/
ATOM WINAPI DeleteAtom16( ATOM atom )
{
ATOMENTRY * entryPtr;
ATOMTABLE * table;
HANDLE16 entry, *prevEntry;
WORD hash;
if (atom < MAXINTATOM) return 0; /* Integer atom */
TRACE("0x%x\n",atom);
if (!(table = ATOM_GetTable( FALSE ))) return 0;
entry = ATOMTOHANDLE( atom );
entryPtr = ATOM_MakePtr( entry );
/* Find previous atom */
hash = ATOM_Hash( table->size, entryPtr->str, entryPtr->length );
prevEntry = &table->entries[hash];
while (*prevEntry && *prevEntry != entry)
{
ATOMENTRY * prevEntryPtr = ATOM_MakePtr( *prevEntry );
prevEntry = &prevEntryPtr->next;
}
if (!*prevEntry) return atom;
/* Delete atom */
if (--entryPtr->refCount == 0)
{
*prevEntry = entryPtr->next;
LocalFree16( entry );
}
return 0;
}
/***********************************************************************
* FindAtom (KERNEL.69)
*/
ATOM WINAPI FindAtom16( LPCSTR str )
{
ATOMTABLE * table;
WORD hash,iatom;
HANDLE16 entry;
int len;
TRACE("%s\n",debugstr_a(str));
if (ATOM_IsIntAtomA( str, &iatom )) return iatom;
if ((len = strlen( str )) > 255) len = 255;
if (!(table = ATOM_GetTable( FALSE ))) return 0;
hash = ATOM_Hash( table->size, str, len );
entry = table->entries[hash];
while (entry)
{
ATOMENTRY * entryPtr = ATOM_MakePtr( entry );
if ((entryPtr->length == len) &&
(!_strnicmp( entryPtr->str, str, len )))
{
TRACE("-- found %x\n", entry);
return HANDLETOATOM( entry );
}
entry = entryPtr->next;
}
TRACE("-- not found\n");
return 0;
}
/***********************************************************************
* GetAtomName (KERNEL.72)
*/
UINT16 WINAPI GetAtomName16( ATOM atom, LPSTR buffer, INT16 count )
{
ATOMENTRY * entryPtr;
HANDLE16 entry;
char * strPtr;
INT len;
char text[8];
TRACE("%x\n",atom);
if (!count) return 0;
if (atom < MAXINTATOM)
{
sprintf( text, "#%d", atom );
len = strlen(text);
strPtr = text;
}
else
{
if (!ATOM_GetTable( FALSE )) return 0;
entry = ATOMTOHANDLE( atom );
entryPtr = ATOM_MakePtr( entry );
len = entryPtr->length;
strPtr = entryPtr->str;
}
if (len >= count) len = count-1;
memcpy( buffer, strPtr, len );
buffer[len] = '\0';
return len;
}
Reference in New Issue View Git Blame Copy Permalink