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 <malloc.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_Read( void );
  73 void en50221_Poll( void );
  74 void en50221_AddPMT( uint8_t *p_pmt );
  75 void en50221_UpdatePMT( uint8_t *p_pmt );
  76 void en50221_DeletePMT( uint8_t *p_pmt );
  77 uint8_t en50221_StatusMMI( uint8_t *p_answer, ssize_t *pi_size );
  78 uint8_t en50221_StatusMMISlot( uint8_t *p_buffer, ssize_t i_size,
  79                                uint8_t *p_answer, ssize_t *pi_size );
  80 uint8_t en50221_OpenMMI( uint8_t *p_buffer, ssize_t i_size );
  81 uint8_t en50221_CloseMMI( uint8_t *p_buffer, ssize_t i_size );
  82 uint8_t en50221_GetMMIObject( uint8_t *p_buffer, ssize_t i_size,
  83                               uint8_t *p_answer, ssize_t *pi_size );
  84 uint8_t en50221_SendMMIObject( uint8_t *p_buffer, ssize_t i_size );
  85
  86
  87 /*
  88  * This is where it gets scary: do not show to < 18 yrs old
  89  */
  90
  91 /*****************************************************************************
  92  * en50221_SerializeMMIObject :
  93  *****************************************************************************/
  94 static inline int en50221_SerializeMMIObject( uint8_t *p_answer,
  95                                               ssize_t *pi_size,
  96                                               en50221_mmi_object_t *p_object )
  97 {
  98     ssize_t i_max_size = *pi_size;
  99     en50221_mmi_object_t *p_serialized = (en50221_mmi_object_t *)p_answer;
 100     char **pp_tmp;
 101     int i;
 102
 103 #define STORE_MEMBER(pp_pointer, i_size)                                \
 104     if ( i_size + *pi_size > i_max_size )                               \
 105         return -1;                                                      \
 106     memcpy( p_answer, *pp_pointer, i_size );                            \
 107     *pp_pointer = (void *)*pi_size;                                     \
 108     *pi_size += i_size;                                                 \
 109     p_answer += i_size;
 110
 111     if ( sizeof(en50221_mmi_object_t) > i_max_size )
 112         return -1;
 113     memcpy( p_answer, p_object, sizeof(en50221_mmi_object_t) );
 114     *pi_size = sizeof(en50221_mmi_object_t);
 115     p_answer += sizeof(en50221_mmi_object_t);
 116
 117     switch ( p_object->i_object_type )
 118     {
 119     case EN50221_MMI_ENQ:
 120         STORE_MEMBER( &p_serialized->u.enq.psz_text,
 121                       strlen(p_object->u.enq.psz_text) + 1 );
 122         break;
 123
 124     case EN50221_MMI_ANSW:
 125         STORE_MEMBER( &p_serialized->u.answ.psz_answ,
 126                       strlen(p_object->u.answ.psz_answ) + 1 );
 127         break;
 128
 129     case EN50221_MMI_MENU:
 130     case EN50221_MMI_LIST:
 131         STORE_MEMBER( &p_serialized->u.menu.psz_title,
 132                       strlen(p_object->u.menu.psz_title) + 1 );
 133         STORE_MEMBER( &p_serialized->u.menu.psz_subtitle,
 134                       strlen(p_object->u.menu.psz_subtitle) + 1 );
 135         STORE_MEMBER( &p_serialized->u.menu.psz_bottom,
 136                       strlen(p_object->u.menu.psz_bottom) + 1 );
 137         /* pointer alignment */
 138         i = ((*pi_size + 7) / 8) * 8 - *pi_size;
 139         *pi_size += i;
 140         p_answer += i;
 141         pp_tmp = (char **)p_answer;
 142         STORE_MEMBER( &p_serialized->u.menu.ppsz_choices,
 143                       p_object->u.menu.i_choices * sizeof(char *) );
 144
 145         for ( i = 0; i < p_object->u.menu.i_choices; i++ )
 146         {
 147             STORE_MEMBER( &pp_tmp[i],
 148                           strlen(p_object->u.menu.ppsz_choices[i]) + 1 );
 149         }
 150         break;
 151
 152     default:
 153         break;
 154     }
 155
 156     return 0;
 157 }
 158
 159 /*****************************************************************************
 160  * en50221_UnserializeMMIObject :
 161  *****************************************************************************/
 162 static inline int en50221_UnserializeMMIObject( en50221_mmi_object_t *p_object,
 163                                                 ssize_t i_size )
 164 {
 165     int i, j;
 166
 167 #define CHECK_MEMBER(pp_member)                                         \
 168     if ( (ptrdiff_t)*pp_member >= i_size )                              \
 169         return -1;                                                      \
 170     for ( i = 0; ((char *)p_object + (ptrdiff_t)*pp_member)[i] != '\0'; \
 171           i++ )                                                         \
 172         if ( (ptrdiff_t)*pp_member + i >= i_size )                      \
 173             return -1;                                                  \
 174     *pp_member += (ptrdiff_t)p_object;
 175
 176     switch ( p_object->i_object_type )
 177     {
 178     case EN50221_MMI_ENQ:
 179         CHECK_MEMBER(&p_object->u.enq.psz_text);
 180         break;
 181
 182     case EN50221_MMI_ANSW:
 183         CHECK_MEMBER(&p_object->u.answ.psz_answ);
 184         break;
 185
 186     case EN50221_MMI_MENU:
 187     case EN50221_MMI_LIST:
 188         CHECK_MEMBER(&p_object->u.menu.psz_title);
 189         CHECK_MEMBER(&p_object->u.menu.psz_subtitle);
 190         CHECK_MEMBER(&p_object->u.menu.psz_bottom);
 191         if ( (ptrdiff_t)p_object->u.menu.ppsz_choices
 192               + p_object->u.menu.i_choices * sizeof(char *) >= i_size )
 193             return -1;
 194         p_object->u.menu.ppsz_choices = (char **)((char *)p_object
 195                                  + (ptrdiff_t)p_object->u.menu.ppsz_choices);
 196
 197         for ( j = 0; j < p_object->u.menu.i_choices; j++ )
 198         {
 199             CHECK_MEMBER(&p_object->u.menu.ppsz_choices[j]);
 200         }
 201         break;
 202
 203     default:
 204         break;
 205     }
 206
 207     return 0;
 208 }