/*
 * Atom table functions
 *
 * Copyright 1993, 1994, 1995 Alexandre Julliard
 * Copyright 2004,2005 Eric Pouech
 *
 * 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
 */

#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>

#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"

#include "wine/server.h"
#include "ntdll_misc.h"

#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(atom);

#define MAX_ATOM_LEN    255
#define IS_INTATOM(x)   (((ULONG_PTR)(x) >> 16) == 0)

/******************************************************************
 *		is_integral_atom
 * Returns STATUS_SUCCESS if integral atom and 'pAtom' is filled
 *         STATUS_INVALID_PARAMETER if 'atomstr' is too long
 *         STATUS_MORE_ENTRIES otherwise
 */
static NTSTATUS is_integral_atom( LPCWSTR atomstr, size_t len, RTL_ATOM* pAtom )
{
    RTL_ATOM atom;

    if (!IS_INTATOM( atomstr ))
    {
        const WCHAR* ptr = atomstr;
        if (!len) return STATUS_OBJECT_NAME_INVALID;

        if (*ptr++ == '#')
        {
            atom = 0;
            while (ptr < atomstr + len && *ptr >= '0' && *ptr <= '9')
            {
                atom = atom * 10 + *ptr++ - '0';
            }
            if (ptr > atomstr + 1 && ptr == atomstr + len) goto done;
        }
        if (len > MAX_ATOM_LEN) return STATUS_INVALID_PARAMETER;
        return STATUS_MORE_ENTRIES;
    }
    else atom = LOWORD( atomstr );
done:
    if (!atom || atom >= MAXINTATOM) return STATUS_INVALID_PARAMETER;
    *pAtom = atom;
    return STATUS_SUCCESS;
}

/******************************************************************
 *		RtlDeleteAtomFromAtomTable (NTDLL.@)
 */
NTSTATUS WINAPI RtlDeleteAtomFromAtomTable( RTL_ATOM_TABLE table, RTL_ATOM atom )
{
    NTSTATUS    status;

    TRACE( "%p %x\n", table, atom );
    if (!table) status = STATUS_INVALID_PARAMETER;
    else
    {
        SERVER_START_REQ( delete_atom )
        {
            req->atom = atom;
            req->table = wine_server_obj_handle( table );
            status = wine_server_call( req );
        }
        SERVER_END_REQ;
    }
    return status;
}

/******************************************************************
 *		integral_atom_name (internal)
 *
 * Helper for fetching integral (local/global) atoms names.
 */
static ULONG integral_atom_name(WCHAR* buffer, ULONG len, RTL_ATOM atom)
{
    static const WCHAR fmt[] = {'#','%','u',0};
    WCHAR tmp[16];
    int ret;

    ret = swprintf( tmp, ARRAY_SIZE(tmp), fmt, atom );
    if (!len) return ret * sizeof(WCHAR);
    if (len <= ret) ret = len - 1;
    memcpy( buffer, tmp, ret * sizeof(WCHAR) );
    buffer[ret] = 0;
    return ret * sizeof(WCHAR);
}

/******************************************************************
 *		RtlQueryAtomInAtomTable (NTDLL.@)
 */
NTSTATUS WINAPI RtlQueryAtomInAtomTable( RTL_ATOM_TABLE table, RTL_ATOM atom, ULONG* ref,
                                         ULONG* pin, WCHAR* name, ULONG* len )
{
    NTSTATUS    status = STATUS_SUCCESS;
    DWORD       wlen = 0;

    if (!table) status = STATUS_INVALID_PARAMETER;
    else if (atom < MAXINTATOM)
    {
        if (!atom) return STATUS_INVALID_PARAMETER;
        if (len) wlen = integral_atom_name( name, *len, atom);
        if (ref) *ref = 1;
        if (pin) *pin = 1;
    }
    else
    {
        SERVER_START_REQ( get_atom_information )
        {
            req->atom = atom;
            req->table = wine_server_obj_handle( table );
            if (len && *len && name)
                wine_server_set_reply( req, name, *len );
            status = wine_server_call( req );
            if (status == STATUS_SUCCESS)
            {
                wlen = reply->total;
                if (ref) *ref = reply->count;
                if (pin) *pin = reply->pinned;
            }
        }
        SERVER_END_REQ;
    }
    if (status == STATUS_SUCCESS && len)
    {
        if (*len)
        {
            wlen = min( *len - sizeof(WCHAR), wlen );
            if (name) name[wlen / sizeof(WCHAR)] = 0;
        }
        else status = STATUS_BUFFER_TOO_SMALL;
        *len = wlen;
    }

    TRACE( "%p %x -> %s (%x)\n",
           table, atom, len ? debugstr_wn(name, wlen / sizeof(WCHAR)) : "(null)", status );
    return status;
}

/******************************************************************
 *		RtlCreateAtomTable (NTDLL.@)
 */
NTSTATUS WINAPI RtlCreateAtomTable( ULONG size, RTL_ATOM_TABLE* table )
{
    NTSTATUS    status;

    if (*table)
    {
        if (size) status = STATUS_INVALID_PARAMETER;
        else status = STATUS_SUCCESS;
    }
    else
    {
        SERVER_START_REQ( init_atom_table )
        {
            req->entries = size;
            status = wine_server_call( req );
            *table = wine_server_ptr_handle( reply->table );
        }
        SERVER_END_REQ;
    }
    return status;
}

/******************************************************************
 *		RtlDestroyAtomTable (NTDLL.@)
 */
NTSTATUS WINAPI RtlDestroyAtomTable( RTL_ATOM_TABLE table )
{
    if (!table) return STATUS_INVALID_PARAMETER;
    return NtClose( table );
}

/******************************************************************
 *		RtlAddAtomToAtomTable (NTDLL.@)
 */
NTSTATUS WINAPI RtlAddAtomToAtomTable( RTL_ATOM_TABLE table, const WCHAR* name, RTL_ATOM* atom )
{
    NTSTATUS    status;

    if (!table) status = STATUS_INVALID_PARAMETER;
    else
    {
        size_t len = IS_INTATOM(name) ?  0 : wcslen(name);
        status = is_integral_atom( name, len, atom );
        if (status == STATUS_MORE_ENTRIES)
        {
            SERVER_START_REQ( add_atom )
            {
                wine_server_add_data( req, name, len * sizeof(WCHAR) );
                req->table = wine_server_obj_handle( table );
                status = wine_server_call( req );
                *atom = reply->atom;
            }
            SERVER_END_REQ;
        }
    }
    TRACE( "%p %s -> %x\n",
           table, debugstr_w(name), status == STATUS_SUCCESS ? *atom : 0 );

    return status;
}

/******************************************************************
 *		RtlLookupAtomInAtomTable (NTDLL.@)
 */
NTSTATUS WINAPI RtlLookupAtomInAtomTable( RTL_ATOM_TABLE table, const WCHAR* name, RTL_ATOM* atom )
{
    NTSTATUS    status;

    if (!table) status = STATUS_INVALID_PARAMETER;
    else
    {
        size_t len = IS_INTATOM(name) ? 0 : wcslen(name);
        status = is_integral_atom( name, len, atom );
        if (status == STATUS_MORE_ENTRIES)
        {
            SERVER_START_REQ( find_atom )
            {
                wine_server_add_data( req, name, len * sizeof(WCHAR) );
                req->table = wine_server_obj_handle( table );
                status = wine_server_call( req );
                *atom = reply->atom;
            }
            SERVER_END_REQ;
        }
    }
    TRACE( "%p %s -> %x\n",
           table, debugstr_w(name), status == STATUS_SUCCESS ? *atom : 0 );
    return status;
}

/******************************************************************
 *		RtlEmptyAtomTable (NTDLL.@)
 */
NTSTATUS WINAPI RtlEmptyAtomTable( RTL_ATOM_TABLE table, BOOLEAN delete_pinned )
{
    NTSTATUS    status;

    if (!table) status = STATUS_INVALID_PARAMETER;
    else
    {
        SERVER_START_REQ( empty_atom_table )
        {
            req->table = wine_server_obj_handle( table );
            req->if_pinned = delete_pinned;
            status = wine_server_call( req );
        }
        SERVER_END_REQ;
    }
    return status;
}

/******************************************************************
 *		RtlPinAtomInAtomTable (NTDLL.@)
 */
NTSTATUS WINAPI RtlPinAtomInAtomTable( RTL_ATOM_TABLE table, RTL_ATOM atom )
{
    NTSTATUS status;

    if (!table) return STATUS_INVALID_PARAMETER;
    if (atom < MAXINTATOM) return STATUS_SUCCESS;

    SERVER_START_REQ( set_atom_information )
    {
        req->table = wine_server_obj_handle( table );
        req->atom = atom;
        req->pinned = TRUE;
        status = wine_server_call( req );
    }
    SERVER_END_REQ;

    return status;
}