QRScanner/mobile/jni/thirdparty/freetype/src/gxvalid/gxvmort0.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  gxvmort0.c                                                             */
   4 /*                                                                         */
   5 /*    TrueTypeGX/AAT mort table validation                                 */
   6 /*    body for type0 (Indic Script Rearrangement) subtable.                */
   7 /*                                                                         */
   8 /*  Copyright 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K.,       */
   9 /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
  10 /*                                                                         */
  11 /*  This file is part of the FreeType project, and may only be used,       */
  12 /*  modified, and distributed under the terms of the FreeType project      */
  13 /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
  14 /*  this file you indicate that you have read the license and              */
  15 /*  understand and accept it fully.                                        */
  16 /*                                                                         */
  17 /***************************************************************************/
  18
  19 /***************************************************************************/
  20 /*                                                                         */
  21 /* gxvalid is derived from both gxlayout module and otvalid module.        */
  22 /* Development of gxlayout is supported by the Information-technology      */
  23 /* Promotion Agency(IPA), Japan.                                           */
  24 /*                                                                         */
  25 /***************************************************************************/
  26
  27
  28 #include "gxvmort.h"
  29
  30
  31   /*************************************************************************/
  32   /*                                                                       */
  33   /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
  34   /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
  35   /* messages during execution.                                            */
  36   /*                                                                       */
  37 #undef  FT_COMPONENT
  38 #define FT_COMPONENT  trace_gxvmort
  39
  40
  41   static const char* GXV_Mort_IndicScript_Msg[] =
  42   {
  43     "no change",
  44     "Ax => xA",
  45     "xD => Dx",
  46     "AxD => DxA",
  47     "ABx => xAB",
  48     "ABx => xBA",
  49     "xCD => CDx",
  50     "xCD => DCx",
  51     "AxCD => CDxA",
  52     "AxCD => DCxA",
  53     "ABxD => DxAB",
  54     "ABxD => DxBA",
  55     "ABxCD => CDxAB",
  56     "ABxCD => CDxBA",
  57     "ABxCD => DCxAB",
  58     "ABxCD => DCxBA",
  59
  60   };
  61
  62
  63   static void
  64   gxv_mort_subtable_type0_entry_validate(
  65     FT_Byte                         state,
  66     FT_UShort                       flags,
  67     GXV_StateTable_GlyphOffsetCPtr  glyphOffset_p,
  68     FT_Bytes                        table,
  69     FT_Bytes                        limit,
  70     GXV_Validator                   valid )
  71   {
  72     FT_UShort  markFirst;
  73     FT_UShort  dontAdvance;
  74     FT_UShort  markLast;
  75     FT_UShort  reserved;
  76     FT_UShort  verb = 0;
  77
  78     FT_UNUSED( state );
  79     FT_UNUSED( table );
  80     FT_UNUSED( limit );
  81
  82     FT_UNUSED( GXV_Mort_IndicScript_Msg[verb] ); /* for the non-debugging */
  83     FT_UNUSED( glyphOffset_p );                  /* case                  */
  84
  85
  86     markFirst   = (FT_UShort)( ( flags >> 15 ) & 1 );
  87     dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 );
  88     markLast    = (FT_UShort)( ( flags >> 13 ) & 1 );
  89
  90     reserved = (FT_UShort)( flags & 0x1FF0 );
  91     verb     = (FT_UShort)( flags & 0x000F );
  92
  93     GXV_TRACE(( "  IndicScript MorphRule for glyphOffset 0x%04x",
  94                 glyphOffset_p->u ));
  95     GXV_TRACE(( " markFirst=%01d", markFirst ));
  96     GXV_TRACE(( " dontAdvance=%01d", dontAdvance ));
  97     GXV_TRACE(( " markLast=%01d", markLast ));
  98     GXV_TRACE(( " %02d", verb ));
  99     GXV_TRACE(( " %s\n", GXV_Mort_IndicScript_Msg[verb] ));
 100
 101     if ( markFirst > 0 && markLast > 0 )
 102     {
 103       GXV_TRACE(( "  [odd] a glyph is marked as the first and last"
 104                   "  in Indic rearrangement\n" ));
 105       GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA );
 106     }
 107
 108     if ( markFirst > 0 && dontAdvance > 0 )
 109     {
 110       GXV_TRACE(( "  [odd] the first glyph is marked as dontAdvance"
 111                   " in Indic rearrangement\n" ));
 112       GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA );
 113     }
 114
 115     if ( 0 < reserved )
 116     {
 117       GXV_TRACE(( " non-zero bits found in reserved range\n" ));
 118       GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA );
 119     }
 120     else
 121       GXV_TRACE(( "\n" ));
 122   }
 123
 124
 125   FT_LOCAL_DEF( void )
 126   gxv_mort_subtable_type0_validate( FT_Bytes       table,
 127                                     FT_Bytes       limit,
 128                                     GXV_Validator  valid )
 129   {
 130     FT_Bytes  p = table;
 131
 132
 133     GXV_NAME_ENTER(
 134       "mort chain subtable type0 (Indic-Script Rearrangement)" );
 135
 136     GXV_LIMIT_CHECK( GXV_STATETABLE_HEADER_SIZE );
 137
 138     valid->statetable.optdata               = NULL;
 139     valid->statetable.optdata_load_func     = NULL;
 140     valid->statetable.subtable_setup_func   = NULL;
 141     valid->statetable.entry_glyphoffset_fmt = GXV_GLYPHOFFSET_NONE;
 142     valid->statetable.entry_validate_func =
 143       gxv_mort_subtable_type0_entry_validate;
 144
 145     gxv_StateTable_validate( p, limit, valid );
 146
 147     GXV_EXIT;
 148   }
 149
 150
 151 /* END */