gatt.c

/*
 * BLE Generic Attribute Profile (GATT) APIs
 *
 * Copyright 2025 Vibhav Pant
 *
 * 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 <stdarg.h>
#include <stdint.h>

#include <windef.h>
#include <winbase.h>

#include <bthsdpdef.h>
#include <bluetoothapis.h>
#include <bthdef.h>
#include <winioctl.h>

#include <bthledef.h>
#include <bluetoothleapis.h>

#include <wine/winebth.h>
#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL( bluetoothapis );

static const char *debugstr_BTH_LE_UUID( const BTH_LE_UUID *uuid )
{
    if (uuid->IsShortUuid)
        return wine_dbg_sprintf("{ IsShortUuid=1 {%#x} }", uuid->Value.ShortUuid );
    return wine_dbg_sprintf( "{ IsShortUuid=0 %s }", debugstr_guid( &uuid->Value.LongUuid ) );
}

static const char *debugstr_BTH_LE_GATT_SERVICE( const BTH_LE_GATT_SERVICE *svc )
{
    if (!svc)
        return wine_dbg_sprintf( "(null)" );
    return wine_dbg_sprintf( "{ %s %#x }", debugstr_BTH_LE_UUID( &svc->ServiceUuid ), svc->AttributeHandle );
}

HRESULT WINAPI BluetoothGATTGetServices( HANDLE le_device, USHORT count, BTH_LE_GATT_SERVICE *buf,
                                         USHORT *actual, ULONG flags )
{
    struct winebth_le_device_get_gatt_services_params *services;
    SIZE_T services_count = 1;

    TRACE( "(%p, %u, %p, %p, %#lx)\n", le_device, count, buf, actual, flags );

    if (!actual)
        return E_POINTER;

    if ((!buf && count) || (buf && !count))
        return E_INVALIDARG;

    for (;;)
    {
        DWORD size, bytes;

        size = offsetof( struct winebth_le_device_get_gatt_services_params, services[services_count] );
        services = calloc( 1, size );
        if (!services)
            return HRESULT_FROM_WIN32( ERROR_NO_SYSTEM_RESOURCES );
        if (!DeviceIoControl( le_device, IOCTL_WINEBTH_LE_DEVICE_GET_GATT_SERVICES, NULL, 0, services, size, &bytes, NULL )
            && GetLastError() != ERROR_MORE_DATA)
        {
            free( services );
            return HRESULT_FROM_WIN32( GetLastError() );
        }
        if (!services->count)
        {
            *actual = 0;
            free( services );
            return S_OK;
        }
        if (services_count != services->count)
        {
            services_count = services->count;
            free( services );
            continue;
        }
        break;
    }

    *actual = services_count;
    if (!buf)
    {
        free( services );
        return HRESULT_FROM_WIN32( ERROR_MORE_DATA );
    }

    memcpy( buf, services->services, min( services_count, count ) * sizeof( *buf ) );
    free( services );
    if (count < services_count)
        return HRESULT_FROM_WIN32( ERROR_INVALID_USER_BUFFER );

    return S_OK;
}

HRESULT WINAPI BluetoothGATTGetCharacteristics( HANDLE device, BTH_LE_GATT_SERVICE *service, USHORT count,
                                                BTH_LE_GATT_CHARACTERISTIC *buf, USHORT *actual, ULONG flags )
{
    struct winebth_le_device_get_gatt_characteristics_params *chars;
    DWORD size, bytes;

    TRACE( "(%p, %s, %u, %p, %p, %#lx)\n", device, debugstr_BTH_LE_GATT_SERVICE( service ), count, buf, actual, flags );

    if (flags)
        FIXME( "Unsupported flags: %#lx\n", flags );

    if (!actual)
        return E_POINTER;

    if ((buf && !count) || !service)
        return E_INVALIDARG;

    size = offsetof( struct winebth_le_device_get_gatt_characteristics_params, characteristics[count] );
    chars = calloc( 1, size );
    if (!chars)
        return HRESULT_FROM_WIN32( ERROR_NO_SYSTEM_RESOURCES );
    chars->service = *service;
    if (!DeviceIoControl( device, IOCTL_WINEBTH_LE_DEVICE_GET_GATT_CHARACTERISTICS, chars, size, chars,
                               size, &bytes, NULL ) && GetLastError() != ERROR_MORE_DATA)
    {
        free( chars );
        return HRESULT_FROM_WIN32( GetLastError() );
    }

    *actual = chars->count;
    if (!chars->count)
    {
        free( chars );
        return S_OK;
    }
    if (!buf)
    {
        free( chars );
        return HRESULT_FROM_WIN32( ERROR_MORE_DATA );
    }
    memcpy( buf, chars->characteristics, min( count, chars->count ) * sizeof( *buf ) );
    free( chars );
    if (count < *actual)
        return HRESULT_FROM_WIN32( ERROR_INVALID_USER_BUFFER );
    return S_OK;
}