reactos/lib/3rdparty/freetype/src/cff/cf2read.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  cf2read.c                                                              */
   4 /*                                                                         */
   5 /*    Adobe's code for stream handling (body).                             */
   6 /*                                                                         */
   7 /*  Copyright 2007-2013 Adobe Systems Incorporated.                        */
   8 /*                                                                         */
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  14 /*  FreeType Project License, each contributor to the Work hereby grants   */
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  34 /*  and you accept them fully.                                             */
  35 /*                                                                         */
  36 /***************************************************************************/
  37
  38
  39 #include "cf2ft.h"
  40 #include FT_INTERNAL_DEBUG_H
  41
  42 #include "cf2glue.h"
  43
  44 #include "cf2error.h"
  45
  46
  47   /* Define CF2_IO_FAIL as 1 to enable random errors and random */
  48   /* value errors in I/O.                                       */
  49 #define CF2_IO_FAIL  0
  50
  51
  52 #if CF2_IO_FAIL
  53
  54   /* set the .00 value to a nonzero probability */
  55   static int
  56   randomError2( void )
  57   {
  58     /* for region buffer ReadByte (interp) function */
  59     return (double)rand() / RAND_MAX < .00;
  60   }
  61
  62   /* set the .00 value to a nonzero probability */
  63   static CF2_Int
  64   randomValue()
  65   {
  66     return (double)rand() / RAND_MAX < .00 ? rand() : 0;
  67   }
  68
  69 #endif /* CF2_IO_FAIL */
  70
  71
  72   /* Region Buffer                                      */
  73   /*                                                    */
  74   /* Can be constructed from a copied buffer managed by */
  75   /* `FCM_getDatablock'.                                */
  76   /* Reads bytes with check for end of buffer.          */
  77
  78   /* reading past the end of the buffer sets error and returns zero */
  79   FT_LOCAL_DEF( CF2_Int )
  80   cf2_buf_readByte( CF2_Buffer  buf )
  81   {
  82     if ( buf->ptr < buf->end )
  83     {
  84 #if CF2_IO_FAIL
  85       if ( randomError2() )
  86       {
  87         CF2_SET_ERROR( buf->error, Invalid_Stream_Operation );
  88         return 0;
  89       }
  90
  91       return *(buf->ptr)++ + randomValue();
  92 #else
  93       return *(buf->ptr)++;
  94 #endif
  95     }
  96     else
  97     {
  98       CF2_SET_ERROR( buf->error, Invalid_Stream_Operation );
  99       return 0;
 100     }
 101   }
 102
 103
 104   /* note: end condition can occur without error */
 105   FT_LOCAL_DEF( FT_Bool )
 106   cf2_buf_isEnd( CF2_Buffer  buf )
 107   {
 108     return (FT_Bool)( buf->ptr >= buf->end );
 109   }
 110
 111
 112 /* END */