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3dd618791e
wine/memory/atom.c
Patrik Stridvall 3dd618791e Documentation fixes.
2001-07-18 21:02:05 +00:00

806 lines
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/*
* Atom table functions
*
* Copyright 1993, 1994, 1995 Alexandre Julliard
*/
/*
* 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 <stdio.h>
#include <string.h>
#include <ctype.h>
#include "windef.h"
#include "winnls.h"
#include "wine/winbase16.h"
#include "wine/unicode.h"
#include "winerror.h"
#include "instance.h"
#include "stackframe.h"
#include "debugtools.h"
#include "server.h"
DEFAULT_DEBUG_CHANNEL(atom);
#define DEFAULT_ATOMTABLE_SIZE 37
#define MIN_STR_ATOM 0xc000
#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;
BYTE str[1];
} ATOMENTRY;
typedef struct
{
WORD size;
HANDLE16 entries[1];
} ATOMTABLE;
static WORD ATOM_UserDS = 0; /* USER data segment */
/***********************************************************************
* ATOM_Init
*
* Global table initialisation.
*/
BOOL ATOM_Init( WORD globalTableSel )
{
ATOM_UserDS = globalTableSel;
return TRUE;
}
/***********************************************************************
* 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 ^= toupper(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 || (atom >= MIN_STR_ATOM))
{
SetLastError( ERROR_INVALID_PARAMETER );
atom = 0;
}
*atomid = atom;
return TRUE;
}
/***********************************************************************
* ATOM_IsIntAtomW
*/
static BOOL ATOM_IsIntAtomW(LPCWSTR 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 || (atom >= MIN_STR_ATOM))
{
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;
/* We consider the first table to be initialized as the global table.
* This works, as USER (both built-in and native) is the first one to
* register ...
*/
if (!ATOM_UserDS)
{
ATOM_UserDS = CURRENT_DS;
/* return dummy local handle */
return LocalAlloc16( LMEM_FIXED, 1 );
}
/* Allocate the table */
if (!entries) entries = DEFAULT_ATOMTABLE_SIZE; /* sanity check */
handle = LocalAlloc16( LMEM_FIXED, sizeof(ATOMTABLE) + (entries-1) * sizeof(HANDLE16) );
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 < MIN_STR_ATOM) 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(buffer));
/* Make a copy of the string to be sure it doesn't move in linear memory. */
lstrcpynA( buffer, str, sizeof(buffer) );
len = strlen( buffer );
if (!(table = ATOM_GetTable( TRUE ))) return 0;
if (CURRENT_DS == ATOM_UserDS) return GlobalAddAtomA( str );
hash = ATOM_Hash( table->size, buffer, len );
entry = table->entries[hash];
while (entry)
{
entryPtr = ATOM_MakePtr( entry );
if ((entryPtr->length == len) &&
(!strncasecmp( 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;
/* Some applications _need_ the '\0' padding provided by this strncpy */
strncpy( entryPtr->str, buffer, ae_len - sizeof(ATOMENTRY) + 1 );
entryPtr->str[ae_len - sizeof(ATOMENTRY)] = '\0';
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 < MIN_STR_ATOM) return 0; /* Integer atom */
if (CURRENT_DS == ATOM_UserDS) return GlobalDeleteAtom( 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;
if (CURRENT_DS == ATOM_UserDS) return GlobalFindAtomA( str );
TRACE("%s\n",debugres_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) &&
(!strncasecmp( 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 )
{
ATOMTABLE * table;
ATOMENTRY * entryPtr;
HANDLE16 entry;
char * strPtr;
UINT len;
char text[8];
if (CURRENT_DS == ATOM_UserDS) return GlobalGetAtomNameA( atom, buffer, count );
TRACE("%x\n",atom);
if (!count) return 0;
if (atom < MIN_STR_ATOM)
{
sprintf( text, "#%d", atom );
len = strlen(text);
strPtr = text;
}
else
{
if (!(table = 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;
}
/***********************************************************************
* InitAtomTable (KERNEL32.@)
*/
BOOL WINAPI InitAtomTable( DWORD entries )
{
BOOL ret;
SERVER_START_REQ( init_atom_table )
{
req->entries = entries;
ret = !SERVER_CALL_ERR();
}
SERVER_END_REQ;
return ret;
}
static ATOM ATOM_AddAtomA( LPCSTR str, BOOL local )
{
ATOM atom = 0;
if (!ATOM_IsIntAtomA( str, &atom ))
{
DWORD len = MultiByteToWideChar( CP_ACP, 0, str, strlen(str), NULL, 0 );
if (len > MAX_ATOM_LEN)
{
SetLastError( ERROR_INVALID_PARAMETER );
return 0;
}
SERVER_START_VAR_REQ( add_atom, len * sizeof(WCHAR) )
{
MultiByteToWideChar( CP_ACP, 0, str, strlen(str), server_data_ptr(req), len );
req->local = local;
if (!SERVER_CALL_ERR()) atom = req->atom + MIN_STR_ATOM;
}
SERVER_END_VAR_REQ;
}
TRACE( "(%s) %s -> %x\n", local ? "local" : "global", debugres_a(str), atom );
return atom;
}
/***********************************************************************
* GlobalAddAtomA (KERNEL32.@)
*
* Adds a character string to the global atom table and returns a unique
* value identifying the string.
*
* RETURNS
* Atom: Success
* 0: Failure
*/
ATOM WINAPI GlobalAddAtomA( LPCSTR str /* [in] Pointer to string to add */ )
{
return ATOM_AddAtomA( str, FALSE );
}
/***********************************************************************
* AddAtomA (KERNEL32.@)
* Adds a string to the atom table and returns the atom identifying the
* string.
*
* RETURNS
* Atom: Success
* 0: Failure
*/
ATOM WINAPI AddAtomA( LPCSTR str /* [in] Pointer to string to add */ )
{
return ATOM_AddAtomA( str, TRUE );
}
static ATOM ATOM_AddAtomW( LPCWSTR str, BOOL local )
{
ATOM atom = 0;
if (!ATOM_IsIntAtomW( str, &atom ))
{
DWORD len = strlenW(str);
if (len > MAX_ATOM_LEN)
{
SetLastError( ERROR_INVALID_PARAMETER );
return 0;
}
SERVER_START_VAR_REQ( add_atom, len * sizeof(WCHAR) )
{
memcpy( server_data_ptr(req), str, len * sizeof(WCHAR) );
req->local = local;
if (!SERVER_CALL_ERR()) atom = req->atom + MIN_STR_ATOM;
}
SERVER_END_VAR_REQ;
}
TRACE( "(%s) %s -> %x\n", local ? "local" : "global", debugres_w(str), atom );
return atom;
}
/***********************************************************************
* GlobalAddAtomW (KERNEL32.@)
*/
ATOM WINAPI GlobalAddAtomW( LPCWSTR str )
{
return ATOM_AddAtomW( str, FALSE );
}
/***********************************************************************
* AddAtomW (KERNEL32.@)
*/
ATOM WINAPI AddAtomW( LPCWSTR str )
{
return ATOM_AddAtomW( str, TRUE );
}
static ATOM ATOM_DeleteAtom( ATOM atom, BOOL local)
{
TRACE( "(%s) %x\n", local ? "local" : "global", atom );
if (atom < MIN_STR_ATOM) atom = 0;
else
{
SERVER_START_REQ( delete_atom )
{
req->atom = atom - MIN_STR_ATOM;
req->local = local;
if (!SERVER_CALL_ERR()) atom = 0;
}
SERVER_END_REQ;
}
return atom;
}
/***********************************************************************
* GlobalDeleteAtom (KERNEL32.@)
* Decrements the reference count of a string atom. If the count is
* zero, the string associated with the atom is removed from the table.
*
* RETURNS
* 0: Success
* Atom: Failure
*/
ATOM WINAPI GlobalDeleteAtom( ATOM atom /* [in] Atom to delete */ )
{
return ATOM_DeleteAtom( atom, FALSE);
}
/***********************************************************************
* DeleteAtom (KERNEL32.@)
* Decrements the reference count of a string atom. If count becomes
* zero, the string associated with the atom is removed from the table.
*
* RETURNS
* 0: Success
* Atom: Failure
*/
ATOM WINAPI DeleteAtom( ATOM atom /* [in] Atom to delete */ )
{
return ATOM_DeleteAtom( atom, TRUE );
}
static ATOM ATOM_FindAtomA( LPCSTR str, BOOL local )
{
ATOM atom = 0;
if (!ATOM_IsIntAtomA( str, &atom ))
{
DWORD len = MultiByteToWideChar( CP_ACP, 0, str, strlen(str), NULL, 0 );
if (len > MAX_ATOM_LEN)
{
SetLastError( ERROR_INVALID_PARAMETER );
return 0;
}
SERVER_START_VAR_REQ( find_atom, len * sizeof(WCHAR) )
{
MultiByteToWideChar( CP_ACP, 0, str, strlen(str), server_data_ptr(req), len );
req->local = local;
if (!SERVER_CALL_ERR()) atom = req->atom + MIN_STR_ATOM;
}
SERVER_END_VAR_REQ;
}
TRACE( "(%s) %s -> %x\n", local ? "local" : "global", debugres_a(str), atom );
return atom;
}
/***********************************************************************
* GlobalFindAtomA (KERNEL32.@)
*
* Searches the atom table for the string and returns the atom
* associated with it.
*
* RETURNS
* Atom: Success
* 0: Failure
*/
ATOM WINAPI GlobalFindAtomA( LPCSTR str /* [in] Pointer to string to search for */ )
{
return ATOM_FindAtomA( str, FALSE );
}
/***********************************************************************
* FindAtomA (KERNEL32.@)
* Searches the local atom table for the string and returns the atom
* associated with that string.
*
* RETURNS
* Atom: Success
* 0: Failure
*/
ATOM WINAPI FindAtomA( LPCSTR str /* [in] Pointer to string to find */ )
{
return ATOM_FindAtomA( str, TRUE );
}
static ATOM ATOM_FindAtomW( LPCWSTR str, BOOL local )
{
ATOM atom = 0;
if (!ATOM_IsIntAtomW( str, &atom ))
{
DWORD len = strlenW(str);
if (len > MAX_ATOM_LEN)
{
SetLastError( ERROR_INVALID_PARAMETER );
return 0;
}
SERVER_START_VAR_REQ( find_atom, len * sizeof(WCHAR) )
{
memcpy( server_data_ptr(req), str, len * sizeof(WCHAR) );
req->local = local;
if (!SERVER_CALL_ERR()) atom = req->atom + MIN_STR_ATOM;
}
SERVER_END_VAR_REQ;
}
TRACE( "(%s) %s -> %x\n", local ? "local" : "global", debugres_w(str), atom );
return atom;
}
/***********************************************************************
* GlobalFindAtomW (KERNEL32.@)
*/
ATOM WINAPI GlobalFindAtomW( LPCWSTR str )
{
return ATOM_FindAtomW( str, FALSE );
}
/***********************************************************************
* FindAtomW (KERNEL32.@)
*/
ATOM WINAPI FindAtomW( LPCWSTR str )
{
return ATOM_FindAtomW( str, TRUE );
}
static UINT ATOM_GetAtomNameA( ATOM atom, LPSTR buffer, INT count, BOOL local )
{
INT len;
if (count <= 0)
{
SetLastError( ERROR_MORE_DATA );
return 0;
}
if (atom < MIN_STR_ATOM)
{
char name[8];
if (!atom)
{
SetLastError( ERROR_INVALID_PARAMETER );
return 0;
}
len = sprintf( name, "#%d", atom );
lstrcpynA( buffer, name, count );
}
else
{
len = 0;
SERVER_START_VAR_REQ( get_atom_name, MAX_ATOM_LEN * sizeof(WCHAR) )
{
req->atom = atom - MIN_STR_ATOM;
req->local = local;
if (!SERVER_CALL_ERR())
{
len = WideCharToMultiByte( CP_ACP, 0, server_data_ptr(req),
server_data_size(req) / sizeof(WCHAR),
buffer, count - 1, NULL, NULL );
if (!len) len = count; /* overflow */
else buffer[len] = 0;
}
}
SERVER_END_VAR_REQ;
}
if (len && count <= len)
{
SetLastError( ERROR_MORE_DATA );
buffer[count-1] = 0;
return 0;
}
TRACE( "(%s) %x -> %s\n", local ? "local" : "global", atom, debugstr_a(buffer) );
return len;
}
/***********************************************************************
* GlobalGetAtomNameA (KERNEL32.@)
*
* Retrieves a copy of the string associated with an atom.
*
* RETURNS
* Length of string in characters: Success
* 0: Failure
*/
UINT WINAPI GlobalGetAtomNameA(
ATOM atom, /* [in] Atom identifier */
LPSTR buffer, /* [out] Pointer to buffer for atom string */
INT count ) /* [in] Size of buffer */
{
return ATOM_GetAtomNameA( atom, buffer, count, FALSE );
}
/***********************************************************************
* GetAtomNameA (KERNEL32.@)
* Retrieves a copy of the string associated with the atom.
*
* RETURNS
* Length of string: Success
* 0: Failure
*/
UINT WINAPI GetAtomNameA(
ATOM atom, /* [in] Atom */
LPSTR buffer, /* [out] Pointer to string for atom string */
INT count) /* [in] Size of buffer */
{
return ATOM_GetAtomNameA( atom, buffer, count, TRUE );
}
static UINT ATOM_GetAtomNameW( ATOM atom, LPWSTR buffer, INT count, BOOL local )
{
INT len;
if (count <= 0)
{
SetLastError( ERROR_MORE_DATA );
return 0;
}
if (atom < MIN_STR_ATOM)
{
char name[8];
if (!atom)
{
SetLastError( ERROR_INVALID_PARAMETER );
return 0;
}
sprintf( name, "#%d", atom );
len = MultiByteToWideChar( CP_ACP, 0, name, -1, buffer, count );
if (!len) buffer[count-1] = 0; /* overflow */
}
else
{
len = 0;
SERVER_START_VAR_REQ( get_atom_name, MAX_ATOM_LEN * sizeof(WCHAR) )
{
req->atom = atom - MIN_STR_ATOM;
req->local = local;
if (!SERVER_CALL_ERR())
{
len = server_data_size(req) / sizeof(WCHAR);
if (count > len) count = len + 1;
memcpy( buffer, server_data_ptr(req), (count-1) * sizeof(WCHAR) );
buffer[count-1] = 0;
}
}
SERVER_END_VAR_REQ;
if (!len) return 0;
}
if (count <= len)
{
SetLastError( ERROR_MORE_DATA );
return 0;
}
TRACE( "(%s) %x -> %s\n", local ? "local" : "global", atom, debugstr_w(buffer) );
return len;
}
/***********************************************************************
* GlobalGetAtomNameW (KERNEL32.@)
*/
UINT WINAPI GlobalGetAtomNameW( ATOM atom, LPWSTR buffer, INT count )
{
return ATOM_GetAtomNameW( atom, buffer, count, FALSE);
}
/***********************************************************************
* GetAtomNameW (KERNEL32.@)
*/
UINT WINAPI GetAtomNameW( ATOM atom, LPWSTR buffer, INT count )
{
return ATOM_GetAtomNameW( atom, buffer, count, TRUE );
}
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