/*****************************************************************************
 * update.c: VLC update checking and downloading
 *****************************************************************************
 * Copyright © 2005-2008 the VideoLAN team
 * $Id: 4660b0b5b0a979ec1b6f823095a18dd7a0d54261 $
 *
 * Authors: Antoine Cellerier <dionoea -at- videolan -dot- org>
 *          Rémi Duraffort <ivoire at via.ecp.fr>
            Rafaël Carré <funman@videolanorg>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either release 2 of the License, or
 * (at your option) any later release.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

/**
 *   \file
 *   This file contains functions related to VLC update management
 */

/*****************************************************************************
 * Preamble
 *****************************************************************************/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <vlc_common.h>
#include <vlc_update.h>

#ifdef UPDATE_CHECK

#include <assert.h>

#include <vlc_pgpkey.h>
#include <vlc_stream.h>
#include <vlc_strings.h>
#include <vlc_fs.h>
#include <vlc_dialog.h>
#include <vlc_interface.h>

#include <gcrypt.h>
#include <vlc_gcrypt.h>
#ifdef WIN32
#include <shellapi.h>
#endif
#include "update.h"
#include "../libvlc.h"

/*****************************************************************************
 * Misc defines
 *****************************************************************************/

/*
 * Here is the format of these "status files" :
 * First line is the last version: "X.Y.Ze" where:
 *      * X is the major number
 *      * Y is the minor number
 *      * Z is the revision number
 *      * e is an OPTIONAL extra letter
 *      * AKA "0.8.6d" or "0.9.0"
 * Second line is an url of the binary for this last version
 * Remaining text is a required description of the update
 */

#if defined( UNDER_CE )
#   define UPDATE_VLC_STATUS_URL "http://update.videolan.org/vlc/status-ce"
#elif defined( WIN32 )
#   define UPDATE_VLC_STATUS_URL "http://update.videolan.org/vlc/status-win-x86"
#elif defined( __APPLE__ )
#   if defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ )
#       define UPDATE_VLC_STATUS_URL "http://update.videolan.org/vlc/status-mac-ppc"
#   else
#       define UPDATE_VLC_STATUS_URL "http://update.videolan.org/vlc/status-mac-x86"
#   endif
#elif defined( SYS_BEOS )
#       define UPDATE_VLC_STATUS_URL "http://update.videolan.org/vlc/status-beos-x86"
#else
#   define UPDATE_VLC_STATUS_URL "http://update.videolan.org/vlc/status"
#endif


/*****************************************************************************
 * Update_t functions
 *****************************************************************************/

#undef update_New
/**
 * Create a new update VLC struct
 *
 * \param p_this the calling vlc_object
 * \return pointer to new update_t or NULL
 */
update_t *update_New( vlc_object_t *p_this )
{
    update_t *p_update;
    assert( p_this );

    p_update = (update_t *)malloc( sizeof( update_t ) );
    if( !p_update ) return NULL;

    vlc_mutex_init( &p_update->lock );

    p_update->p_libvlc = p_this->p_libvlc;

    p_update->release.psz_url = NULL;
    p_update->release.psz_desc = NULL;

    p_update->p_download = NULL;
    p_update->p_check = NULL;

    p_update->p_pkey = NULL;
    vlc_gcrypt_init();

    return p_update;
}

/**
 * Delete an update_t struct
 *
 * \param p_update update_t* pointer
 * \return nothing
 */
void update_Delete( update_t *p_update )
{
    assert( p_update );

    if( p_update->p_check )
    {
        vlc_object_kill( p_update->p_check );
        vlc_thread_join( p_update->p_check );
        vlc_object_release( p_update->p_check );
    }

    if( p_update->p_download )
    {
        vlc_object_kill( p_update->p_download );
        vlc_thread_join( p_update->p_download );
        vlc_object_release( p_update->p_download );
    }

    vlc_mutex_destroy( &p_update->lock );

    free( p_update->release.psz_url );
    free( p_update->release.psz_desc );
    free( p_update->p_pkey );

    free( p_update );
}

/**
 * Empty the release struct
 *
 * \param p_update update_t* pointer
 * \return nothing
 */
static void EmptyRelease( update_t *p_update )
{
    p_update->release.i_major = 0;
    p_update->release.i_minor = 0;
    p_update->release.i_revision = 0;

    FREENULL( p_update->release.psz_url );
    FREENULL( p_update->release.psz_desc );
}

/**
 * Get the update file and parse it
 * p_update has to be locked when calling this function
 *
 * \param p_update pointer to update struct
 * \return true if the update is valid and authenticated
 */
static bool GetUpdateFile( update_t *p_update )
{
    stream_t *p_stream = NULL;
    int i_major = 0;
    int i_minor = 0;
    int i_revision = 0;
    unsigned char extra;
    char *psz_version_line = NULL;
    char *psz_update_data = NULL;

    p_stream = stream_UrlNew( p_update->p_libvlc, UPDATE_VLC_STATUS_URL );
    if( !p_stream )
    {
        msg_Err( p_update->p_libvlc, "Failed to open %s for reading",
                 UPDATE_VLC_STATUS_URL );
        goto error;
    }

    const int64_t i_read = stream_Size( p_stream );
    psz_update_data = malloc( i_read + 1 ); /* terminating '\0' */
    if( !psz_update_data )
        goto error;

    if( stream_Read( p_stream, psz_update_data, i_read ) != i_read )
    {
        msg_Err( p_update->p_libvlc, "Couldn't download update file %s",
                UPDATE_VLC_STATUS_URL );
        goto error;
    }
    psz_update_data[i_read] = '\0';

    stream_Delete( p_stream );
    p_stream = NULL;

    /* first line : version number */
    char *psz_update_data_parser = psz_update_data;
    size_t i_len = strcspn( psz_update_data, "\r\n" );
    psz_update_data_parser += i_len;
    while( *psz_update_data_parser == '\r' || *psz_update_data_parser == '\n' )
        psz_update_data_parser++;

    if( !(psz_version_line = malloc( i_len + 1)) )
        goto error;
    strncpy( psz_version_line, psz_update_data, i_len );
    psz_version_line[i_len] = '\0';

    p_update->release.extra = 0;
    switch( sscanf( psz_version_line, "%i.%i.%i%c",
                    &i_major, &i_minor, &i_revision, &extra ) )
    {
        case 4:
            p_update->release.extra = extra;
        case 3:
            p_update->release.i_major = i_major;
            p_update->release.i_minor = i_minor;
            p_update->release.i_revision = i_revision;
            break;
        default:
            msg_Err( p_update->p_libvlc, "Update version false formated" );
            goto error;
    }

    /* second line : URL */
    i_len = strcspn( psz_update_data_parser, "\r\n" );
    if( i_len == 0 )
    {
        msg_Err( p_update->p_libvlc, "Update file %s is corrupted: URL missing",
                 UPDATE_VLC_STATUS_URL );

        goto error;
    }

    if( !(p_update->release.psz_url = malloc( i_len + 1)) )
        goto error;
    strncpy( p_update->release.psz_url, psz_update_data_parser, i_len );
    p_update->release.psz_url[i_len] = '\0';

    psz_update_data_parser += i_len;
    while( *psz_update_data_parser == '\r' || *psz_update_data_parser == '\n' )
        psz_update_data_parser++;

    /* Remaining data : description */
    i_len = strlen( psz_update_data_parser );
    if( i_len == 0 )
    {
        msg_Err( p_update->p_libvlc,
                "Update file %s is corrupted: description missing",
                UPDATE_VLC_STATUS_URL );
        goto error;
    }

    if( !(p_update->release.psz_desc = malloc( i_len + 1)) )
        goto error;
    strncpy( p_update->release.psz_desc, psz_update_data_parser, i_len );
    p_update->release.psz_desc[i_len] = '\0';

    /* Now that we know the status is valid, we must download its signature
     * to authenticate it */
    signature_packet_t sign;
    if( download_signature( VLC_OBJECT( p_update->p_libvlc ), &sign,
            UPDATE_VLC_STATUS_URL ) != VLC_SUCCESS )
    {
        msg_Err( p_update->p_libvlc, "Couldn't download signature of status file" );
        goto error;
    }

    if( sign.type != BINARY_SIGNATURE && sign.type != TEXT_SIGNATURE )
    {
        msg_Err( p_update->p_libvlc, "Invalid signature type" );
        goto error;
    }

    p_update->p_pkey = (public_key_t*)malloc( sizeof( public_key_t ) );
    if( !p_update->p_pkey )
        goto error;

    if( parse_public_key( videolan_public_key, sizeof( videolan_public_key ),
                        p_update->p_pkey, NULL ) != VLC_SUCCESS )
    {
        msg_Err( p_update->p_libvlc, "Couldn't parse embedded public key, something went really wrong..." );
        FREENULL( p_update->p_pkey );
        goto error;
    }

    memcpy( p_update->p_pkey->longid, videolan_public_key_longid, 8 );

    if( memcmp( sign.issuer_longid, p_update->p_pkey->longid , 8 ) != 0 )
    {
        msg_Dbg( p_update->p_libvlc, "Need to download the GPG key" );
        public_key_t *p_new_pkey = download_key(
                VLC_OBJECT(p_update->p_libvlc),
                sign.issuer_longid, videolan_public_key_longid );
        if( !p_new_pkey )
        {
            msg_Err( p_update->p_libvlc, "Couldn't download GPG key" );
            FREENULL( p_update->p_pkey );
            goto error;
        }

        uint8_t *p_hash = hash_sha1_from_public_key( p_new_pkey );
        if( !p_hash )
        {
            msg_Err( p_update->p_libvlc, "Failed to hash signature" );
            free( p_new_pkey );
            FREENULL( p_update->p_pkey );
            goto error;
        }

        if( verify_signature( p_new_pkey->sig.r, p_new_pkey->sig.s,
                    &p_update->p_pkey->key, p_hash ) == VLC_SUCCESS )
        {
            free( p_hash );
            msg_Info( p_update->p_libvlc, "Key authenticated" );
            free( p_update->p_pkey );
            p_update->p_pkey = p_new_pkey;
        }
        else
        {
            free( p_hash );
            msg_Err( p_update->p_libvlc, "Key signature invalid !\n" );
            goto error;
        }
    }

    uint8_t *p_hash = hash_sha1_from_text( psz_update_data, &sign );
    if( !p_hash )
    {
        msg_Warn( p_update->p_libvlc, "Can't compute SHA1 hash for status file" );
        goto error;
    }

    else if( p_hash[0] != sign.hash_verification[0] ||
        p_hash[1] != sign.hash_verification[1] )
    {
        msg_Warn( p_update->p_libvlc, "Bad SHA1 hash for status file" );
        goto error;
    }

    else if( verify_signature( sign.r, sign.s, &p_update->p_pkey->key, p_hash )
            != VLC_SUCCESS )
    {
        msg_Err( p_update->p_libvlc, "BAD SIGNATURE for status file" );
        goto error;
    }

    else
    {
        msg_Info( p_update->p_libvlc, "Status file authenticated" );
        return true;
    }

error:
    if( p_stream )
        stream_Delete( p_stream );
    free( psz_version_line );
    free( psz_update_data );
    return false;
}

static void* update_CheckReal( vlc_object_t *p_this );

/**
 * Check for updates
 *
 * \param p_update pointer to update struct
 * \param pf_callback pointer to a function to call when the update_check is finished
 * \param p_data pointer to some datas to give to the callback
 * \returns nothing
 */
void update_Check( update_t *p_update, void (*pf_callback)( void*, bool ), void *p_data )
{
    assert( p_update );

    // If the object already exist, destroy it
    if( p_update->p_check )
    {
        vlc_object_kill( p_update->p_check );
        vlc_thread_join( p_update->p_check );
        vlc_object_release( p_update->p_check );
    }

    update_check_thread_t *p_uct =
        vlc_custom_create( p_update->p_libvlc, sizeof( *p_uct ),
                           VLC_OBJECT_GENERIC, "update check" );
    if( !p_uct ) return;

    p_uct->p_update = p_update;
    p_update->p_check = p_uct;
    p_uct->pf_callback = pf_callback;
    p_uct->p_data = p_data;

    vlc_thread_create( p_uct, "check for update", update_CheckReal,
                       VLC_THREAD_PRIORITY_LOW );
}

void* update_CheckReal( vlc_object_t* p_this )
{
    update_check_thread_t *p_uct = (update_check_thread_t *)p_this;
    bool b_ret;
    int canc;

    canc = vlc_savecancel ();
    vlc_mutex_lock( &p_uct->p_update->lock );

    EmptyRelease( p_uct->p_update );
    b_ret = GetUpdateFile( p_uct->p_update );
    vlc_mutex_unlock( &p_uct->p_update->lock );

    if( p_uct->pf_callback )
        (p_uct->pf_callback)( p_uct->p_data, b_ret );

    vlc_restorecancel (canc);
    return NULL;
}

/**
 * Compare a given release's version number to the current VLC's one
 *
 * \param p_update structure
 * \return true if we have to upgrade to the given version to be up to date
 */
static bool is_strictly_greater( int * a, int * b, int n)
{
    if( n <= 0 ) return false;
    if(a[0] > b[0] ) return true;
    if(a[0] == b[0] ) return is_strictly_greater( a+1, b+1, n-1 );
    /* a[0] < b[0] */ return false;
}

bool update_NeedUpgrade( update_t *p_update )
{
    assert( p_update );

    int current_version[] = {
        *PACKAGE_VERSION_MAJOR - '0',
        *PACKAGE_VERSION_MINOR - '0',
        atoi(PACKAGE_VERSION_REVISION),
        /* extra string of development versions is "-git", "-rc" ..
         * so make sure version a.b.c is newer than a.b.c-XXX */
        (*PACKAGE_VERSION_EXTRA == '-') ? -1 : *PACKAGE_VERSION_EXTRA
    };
    int latest_version[] = {
        p_update->release.i_major,
        p_update->release.i_minor,
        p_update->release.i_revision,
        p_update->release.extra
    };

    return is_strictly_greater( latest_version, current_version, 4 );
}

/**
 * Convert a long int size in bytes to a string
 *
 * \param l_size the size in bytes
 * \return the size as a string
 */
static char *size_str( long int l_size )
{
    char *psz_tmp = NULL;
    int i_retval = 0;
    if( l_size >> 30 )
        i_retval = asprintf( &psz_tmp, _("%.1f GiB"), (float)l_size/(1<<30) );
    else if( l_size >> 20 )
        i_retval = asprintf( &psz_tmp, _("%.1f MiB"), (float)l_size/(1<<20) );
    else if( l_size >> 10 )
        i_retval = asprintf( &psz_tmp, _("%.1f KiB"), (float)l_size/(1<<10) );
    else
        i_retval = asprintf( &psz_tmp, _("%ld B"), l_size );

    return i_retval == -1 ? NULL : psz_tmp;
}

static void* update_DownloadReal( vlc_object_t *p_this );

/**
 * Download the file given in the update_t
 *
 * \param p_update structure
 * \param dir to store the download file
 * \return nothing
 */
void update_Download( update_t *p_update, const char *psz_destdir )
{
    assert( p_update );

    // If the object already exist, destroy it
    if( p_update->p_download )
    {
        vlc_object_kill( p_update->p_download );
        vlc_thread_join( p_update->p_download );
        vlc_object_release( p_update->p_download );
    }

    update_download_thread_t *p_udt =
        vlc_custom_create( p_update->p_libvlc, sizeof( *p_udt ),
                           VLC_OBJECT_GENERIC, "update download" );
    if( !p_udt )
        return;

    p_udt->p_update = p_update;
    p_update->p_download = p_udt;
    p_udt->psz_destdir = psz_destdir ? strdup( psz_destdir ) : NULL;

    vlc_thread_create( p_udt, "download update", update_DownloadReal,
                       VLC_THREAD_PRIORITY_LOW );
}

static void* update_DownloadReal( vlc_object_t *p_this )
{
    update_download_thread_t *p_udt = (update_download_thread_t *)p_this;
    dialog_progress_bar_t *p_progress = NULL;
    long int l_size;
    long int l_downloaded = 0;
    float f_progress;
    char *psz_status = NULL;
    char *psz_downloaded = NULL;
    char *psz_size = NULL;
    char *psz_destfile = NULL;
    char *psz_tmpdestfile = NULL;

    FILE *p_file = NULL;
    stream_t *p_stream = NULL;
    void* p_buffer = NULL;
    int i_read;
    int canc;

    update_t *p_update = p_udt->p_update;
    char *psz_destdir = p_udt->psz_destdir;

    msg_Dbg( p_udt, "Opening Stream '%s'", p_update->release.psz_url );
    canc = vlc_savecancel ();

    /* Open the stream */
    p_stream = stream_UrlNew( p_udt, p_update->release.psz_url );
    if( !p_stream )
    {
        msg_Err( p_udt, "Failed to open %s for reading", p_update->release.psz_url );
        goto end;
    }

    /* Get the stream size */
    l_size = stream_Size( p_stream );

    /* Get the file name and open it*/
    psz_tmpdestfile = strrchr( p_update->release.psz_url, '/' );
    if( !psz_tmpdestfile )
    {
        msg_Err( p_udt, "The URL %s is badly formated",
                 p_update->release.psz_url );
        goto end;
    }
    psz_tmpdestfile++;
    if( asprintf( &psz_destfile, "%s%s", psz_destdir, psz_tmpdestfile ) == -1 )
        goto end;

    p_file = vlc_fopen( psz_destfile, "w" );
    if( !p_file )
    {
        msg_Err( p_udt, "Failed to open %s for writing", psz_destfile );
        dialog_FatalWait( p_udt, _("Saving file failed"),
            _("Failed to open \"%s\" for writing"),
             psz_destfile );
        goto end;
    }

    /* Create a buffer and fill it with the downloaded file */
    p_buffer = (void *)malloc( 1 << 10 );
    if( !p_buffer )
    {
        msg_Err( p_udt, "Can't malloc (1 << 10) bytes! download cancelled." );
        goto end;
    }

    msg_Dbg( p_udt, "Downloading Stream '%s'", p_update->release.psz_url );

    psz_size = size_str( l_size );
    if( asprintf( &psz_status, _("%s\nDownloading... %s/%s %.1f%% done"),
        p_update->release.psz_url, "0.0", psz_size, 0.0 ) != -1 )
    {
        p_progress = dialog_ProgressCreate( p_udt, _( "Downloading ..."),
                                            psz_status, _("Cancel") );
        free( psz_status );
    }

    while( vlc_object_alive( p_udt ) &&
           ( i_read = stream_Read( p_stream, p_buffer, 1 << 10 ) ) &&
           !dialog_ProgressCancelled( p_progress ) )
    {
        if( fwrite( p_buffer, i_read, 1, p_file ) < 1 )
        {
            msg_Err( p_udt, "Failed to write into %s", psz_destfile );
            break;
        }

        l_downloaded += i_read;
        psz_downloaded = size_str( l_downloaded );
        f_progress = (float)l_downloaded/(float)l_size;

        if( asprintf( &psz_status, _( "%s\nDownloading... %s/%s - %.1f%% done" ),
                      p_update->release.psz_url, psz_downloaded, psz_size,
                      f_progress*100 ) != -1 )
        {
            dialog_ProgressSet( p_progress, psz_status, f_progress );
            free( psz_status );
        }
        free( psz_downloaded );
    }

    /* Finish the progress bar or delete the file if the user had canceled */
    fclose( p_file );
    p_file = NULL;

    if( vlc_object_alive( p_udt ) &&
        !dialog_ProgressCancelled( p_progress ) )
    {
        if( asprintf( &psz_status, _("%s\nDone %s (100.0%%)"),
            p_update->release.psz_url, psz_size ) != -1 )
        {
            dialog_ProgressDestroy( p_progress );
            p_progress = NULL;
            free( psz_status );
        }
    }
    else
    {
        vlc_unlink( psz_destfile );
        goto end;
    }

    signature_packet_t sign;
    if( download_signature( VLC_OBJECT( p_udt ), &sign,
            p_update->release.psz_url ) != VLC_SUCCESS )
    {
        vlc_unlink( psz_destfile );

        dialog_FatalWait( p_udt, _("File could not be verified"),
            _("It was not possible to download a cryptographic signature for "
              "the downloaded file \"%s\". Thus, it was deleted."),
            psz_destfile );
        msg_Err( p_udt, "Couldn't download signature of downloaded file" );
        goto end;
    }

    if( memcmp( sign.issuer_longid, p_update->p_pkey->longid, 8 ) )
    {
        vlc_unlink( psz_destfile );
        msg_Err( p_udt, "Invalid signature issuer" );
        dialog_FatalWait( p_udt, _("Invalid signature"),
            _("The cryptographic signature for the downloaded file \"%s\" was "
              "invalid and could not be used to securely verify it. Thus, the "
              "file was deleted."),
            psz_destfile );
        goto end;
    }

    if( sign.type != BINARY_SIGNATURE )
    {
        vlc_unlink( psz_destfile );
        msg_Err( p_udt, "Invalid signature type" );
        dialog_FatalWait( p_udt, _("Invalid signature"),
            _("The cryptographic signature for the downloaded file \"%s\" was "
              "invalid and could not be used to securely verify it. Thus, the "
              "file was deleted."),
            psz_destfile );
        goto end;
    }

    uint8_t *p_hash = hash_sha1_from_file( psz_destfile, &sign );
    if( !p_hash )
    {
        msg_Err( p_udt, "Unable to hash %s", psz_destfile );
        vlc_unlink( psz_destfile );
        dialog_FatalWait( p_udt, _("File not verifiable"),
            _("It was not possible to securely verify the downloaded file"
              " \"%s\". Thus, it was deleted."),
            psz_destfile );

        goto end;
    }

    if( p_hash[0] != sign.hash_verification[0] ||
        p_hash[1] != sign.hash_verification[1] )
    {
        vlc_unlink( psz_destfile );
        dialog_FatalWait( p_udt, _("File corrupted"),
            _("Downloaded file \"%s\" was corrupted. Thus, it was deleted."),
             psz_destfile );
        msg_Err( p_udt, "Bad SHA1 hash for %s", psz_destfile );
        free( p_hash );
        goto end;
    }

    if( verify_signature( sign.r, sign.s, &p_update->p_pkey->key, p_hash )
            != VLC_SUCCESS )
    {
        vlc_unlink( psz_destfile );
        dialog_FatalWait( p_udt, _("File corrupted"),
            _("Downloaded file \"%s\" was corrupted. Thus, it was deleted."),
             psz_destfile );
        msg_Err( p_udt, "BAD SIGNATURE for %s", psz_destfile );
        free( p_hash );
        goto end;
    }

    msg_Info( p_udt, "%s authenticated", psz_destfile );
    free( p_hash );

#ifdef WIN32
    int answer = dialog_Question( p_udt, _("Update VLC media player"),
    _("The new version was successfully downloaded. Do you want to close VLC and install it now?"),
    _("Install"), _("Cancel"), NULL);

    if(answer == 1)
    {
        wchar_t psz_wdestfile[MAX_PATH];
        MultiByteToWideChar( CP_UTF8, 0, psz_destfile, -1, psz_wdestfile, MAX_PATH );
        answer = ShellExecuteW( NULL, L"open", psz_wdestfile, NULL, NULL, SW_SHOW);
        if(answer > 32)
            libvlc_Quit(p_this->p_libvlc);
    }
#endif
end:
    if( p_progress )
        dialog_ProgressDestroy( p_progress );
    if( p_stream )
        stream_Delete( p_stream );
    if( p_file )
        fclose( p_file );
    free( psz_destdir );
    free( psz_destfile );
    free( p_buffer );
    free( psz_size );

    vlc_restorecancel( canc );
    return NULL;
}

update_release_t *update_GetRelease( update_t *p_update )
{
    return &p_update->release;
}

#else
#undef update_New
update_t *update_New( vlc_object_t *p_this )
{
    (void)p_this;
    return NULL;
}

void update_Delete( update_t *p_update )
{
    (void)p_update;
}

void update_Check( update_t *p_update, void (*pf_callback)( void*, bool ),
                   void *p_data )
{
    (void)p_update; (void)pf_callback; (void)p_data;
}

bool update_NeedUpgrade( update_t *p_update )
{
    (void)p_update;
    return false;
}

void update_Download( update_t *p_update, const char *psz_destdir )
{
    (void)p_update; (void)psz_destdir;
}

update_release_t *update_GetRelease( update_t *p_update )
{
    (void)p_update;
    return NULL;
}
#endif
