en50221.h

   1 /*****************************************************************************
   2  * en50221.h
   3  *****************************************************************************
   4  * Copyright (C) 2008 VideoLAN
   5  *
   6  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   7  *
   8  * This program is free software. It comes without any warranty, to
   9  * the extent permitted by applicable law. You can redistribute it
  10  * and/or modify it under the terms of the Do What The Fuck You Want
  11  * To Public License, Version 2, as published by Sam Hocevar. See
  12  * http://sam.zoy.org/wtfpl/COPYING for more details.
  13  *****************************************************************************/
  14
  15 #include <stddef.h>
  16
  17 typedef void * access_t;
  18
  19 #define STRINGIFY( z )   UGLY_KLUDGE( z )
  20 #define UGLY_KLUDGE( z ) #z
  21
  22 #define EN50221_MMI_NONE 0
  23 #define EN50221_MMI_ENQ 1
  24 #define EN50221_MMI_ANSW 2
  25 #define EN50221_MMI_MENU 3
  26 #define EN50221_MMI_MENU_ANSW 4
  27 #define EN50221_MMI_LIST 5
  28
  29 typedef struct en50221_mmi_object_t
  30 {
  31     int i_object_type;
  32
  33     union
  34     {
  35         struct
  36         {
  37             int b_blind;
  38             char *psz_text;
  39         } enq;
  40
  41         struct
  42         {
  43             int b_ok;
  44             char *psz_answ;
  45         } answ;
  46
  47         struct
  48         {
  49             char *psz_title, *psz_subtitle, *psz_bottom;
  50             char **ppsz_choices;
  51             int i_choices;
  52         } menu; /* menu and list are the same */
  53
  54         struct
  55         {
  56             int i_choice;
  57         } menu_answ;
  58     } u;
  59 } en50221_mmi_object_t;
  60
  61 #define MAX_CI_SLOTS 16
  62 #define MAX_SESSIONS 32
  63
  64 extern int i_ca_handle;
  65 extern int i_ca_type;
  66
  67 /*****************************************************************************
  68  * Prototypes
  69  *****************************************************************************/
  70 void en50221_Init( void );
  71 void en50221_Reset( void );
  72 void en50221_AddPMT( uint8_t *p_pmt );
  73 void en50221_UpdatePMT( uint8_t *p_pmt );
  74 void en50221_DeletePMT( uint8_t *p_pmt );
  75 uint8_t en50221_StatusMMI( uint8_t *p_answer, ssize_t *pi_size );
  76 uint8_t en50221_StatusMMISlot( uint8_t *p_buffer, ssize_t i_size,
  77                                uint8_t *p_answer, ssize_t *pi_size );
  78 uint8_t en50221_OpenMMI( uint8_t *p_buffer, ssize_t i_size );
  79 uint8_t en50221_CloseMMI( uint8_t *p_buffer, ssize_t i_size );
  80 uint8_t en50221_GetMMIObject( uint8_t *p_buffer, ssize_t i_size,
  81                               uint8_t *p_answer, ssize_t *pi_size );
  82 uint8_t en50221_SendMMIObject( uint8_t *p_buffer, ssize_t i_size );
  83
  84
  85 /*
  86  * This is where it gets scary: do not show to < 18 yrs old
  87  */
  88
  89 /*****************************************************************************
  90  * en50221_SerializeMMIObject :
  91  *****************************************************************************/
  92 static inline int en50221_SerializeMMIObject( uint8_t *p_answer,
  93                                               ssize_t *pi_size,
  94                                               en50221_mmi_object_t *p_object )
  95 {
  96     ssize_t i_max_size = *pi_size;
  97     en50221_mmi_object_t *p_serialized = (en50221_mmi_object_t *)p_answer;
  98     char **pp_tmp;
  99     int i;
 100
 101 #define STORE_MEMBER(pp_pointer, i_size)                                \
 102     if ( i_size + *pi_size > i_max_size )                               \
 103         return -1;                                                      \
 104     memcpy( p_answer, *pp_pointer, i_size );                            \
 105     *pp_pointer = (void *)*pi_size;                                     \
 106     *pi_size += i_size;                                                 \
 107     p_answer += i_size;
 108
 109     if ( sizeof(en50221_mmi_object_t) > i_max_size )
 110         return -1;
 111     memcpy( p_answer, p_object, sizeof(en50221_mmi_object_t) );
 112     *pi_size = sizeof(en50221_mmi_object_t);
 113     p_answer += sizeof(en50221_mmi_object_t);
 114
 115     switch ( p_object->i_object_type )
 116     {
 117     case EN50221_MMI_ENQ:
 118         STORE_MEMBER( &p_serialized->u.enq.psz_text,
 119                       strlen(p_object->u.enq.psz_text) + 1 );
 120         break;
 121
 122     case EN50221_MMI_ANSW:
 123         STORE_MEMBER( &p_serialized->u.answ.psz_answ,
 124                       strlen(p_object->u.answ.psz_answ) + 1 );
 125         break;
 126
 127     case EN50221_MMI_MENU:
 128     case EN50221_MMI_LIST:
 129         STORE_MEMBER( &p_serialized->u.menu.psz_title,
 130                       strlen(p_object->u.menu.psz_title) + 1 );
 131         STORE_MEMBER( &p_serialized->u.menu.psz_subtitle,
 132                       strlen(p_object->u.menu.psz_subtitle) + 1 );
 133         STORE_MEMBER( &p_serialized->u.menu.psz_bottom,
 134                       strlen(p_object->u.menu.psz_bottom) + 1 );
 135         /* pointer alignment */
 136         i = ((*pi_size + 7) / 8) * 8 - *pi_size;
 137         *pi_size += i;
 138         p_answer += i;
 139         pp_tmp = (char **)p_answer;
 140         STORE_MEMBER( &p_serialized->u.menu.ppsz_choices,
 141                       p_object->u.menu.i_choices * sizeof(char *) );
 142
 143         for ( i = 0; i < p_object->u.menu.i_choices; i++ )
 144         {
 145             STORE_MEMBER( &pp_tmp[i],
 146                           strlen(p_object->u.menu.ppsz_choices[i]) + 1 );
 147         }
 148         break;
 149
 150     default:
 151         break;
 152     }
 153
 154     return 0;
 155 }
 156
 157 /*****************************************************************************
 158  * en50221_UnserializeMMIObject :
 159  *****************************************************************************/
 160 static inline int en50221_UnserializeMMIObject( en50221_mmi_object_t *p_object,
 161                                                 ssize_t i_size )
 162 {
 163     int i, j;
 164
 165 #define CHECK_MEMBER(pp_member)                                         \
 166     if ( (ptrdiff_t)*pp_member >= i_size )                              \
 167         return -1;                                                      \
 168     for ( i = 0; ((char *)p_object + (ptrdiff_t)*pp_member)[i] != '\0'; \
 169           i++ )                                                         \
 170         if ( (ptrdiff_t)*pp_member + i >= i_size )                      \
 171             return -1;                                                  \
 172     *pp_member += (ptrdiff_t)p_object;
 173
 174     switch ( p_object->i_object_type )
 175     {
 176     case EN50221_MMI_ENQ:
 177         CHECK_MEMBER(&p_object->u.enq.psz_text);
 178         break;
 179
 180     case EN50221_MMI_ANSW:
 181         CHECK_MEMBER(&p_object->u.answ.psz_answ);
 182         break;
 183
 184     case EN50221_MMI_MENU:
 185     case EN50221_MMI_LIST:
 186         CHECK_MEMBER(&p_object->u.menu.psz_title);
 187         CHECK_MEMBER(&p_object->u.menu.psz_subtitle);
 188         CHECK_MEMBER(&p_object->u.menu.psz_bottom);
 189         if ( (ptrdiff_t)p_object->u.menu.ppsz_choices
 190               + p_object->u.menu.i_choices * sizeof(char *) >= i_size )
 191             return -1;
 192         p_object->u.menu.ppsz_choices = (char **)((char *)p_object
 193                                  + (ptrdiff_t)p_object->u.menu.ppsz_choices);
 194
 195         for ( j = 0; j < p_object->u.menu.i_choices; j++ )
 196         {
 197             CHECK_MEMBER(&p_object->u.menu.ppsz_choices[j]);
 198         }
 199         break;
 200
 201     default:
 202         break;
 203     }
 204
 205     return 0;
 206 }