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  1. /***************************************************************************/
  2. /*                                                                         */
  3. /*  cf2read.c                                                              */
  4. /*                                                                         */
  5. /*    Adobe's code for stream handling (body).                             */
  6. /*                                                                         */
  7. /*  Copyright 2007-2013 Adobe Systems Incorporated.                        */
  8. /*                                                                         */
  9. /*  This software, and all works of authorship, whether in source or       */
  10. /*  object code form as indicated by the copyright notice(s) included      */
  11. /*  herein (collectively, the "Work") is made available, and may only be   */
  12. /*  used, modified, and distributed under the FreeType Project License,    */
  13. /*  LICENSE.TXT.  Additionally, subject to the terms and conditions of the */
  14. /*  FreeType Project License, each contributor to the Work hereby grants   */
  15. /*  to any individual or legal entity exercising permissions granted by    */
  16. /*  the FreeType Project License and this section (hereafter, "You" or     */
  17. /*  "Your") a perpetual, worldwide, non-exclusive, no-charge,              */
  18. /*  royalty-free, irrevocable (except as stated in this section) patent    */
  19. /*  license to make, have made, use, offer to sell, sell, import, and      */
  20. /*  otherwise transfer the Work, where such license applies only to those  */
  21. /*  patent claims licensable by such contributor that are necessarily      */
  22. /*  infringed by their contribution(s) alone or by combination of their    */
  23. /*  contribution(s) with the Work to which such contribution(s) was        */
  24. /*  submitted.  If You institute patent litigation against any entity      */
  25. /*  (including a cross-claim or counterclaim in a lawsuit) alleging that   */
  26. /*  the Work or a contribution incorporated within the Work constitutes    */
  27. /*  direct or contributory patent infringement, then any patent licenses   */
  28. /*  granted to You under this License for that Work shall terminate as of  */
  29. /*  the date such litigation is filed.                                     */
  30. /*                                                                         */
  31. /*  By using, modifying, or distributing the Work you indicate that you    */
  32. /*  have read and understood the terms and conditions of the               */
  33. /*  FreeType Project License as well as those provided in this section,    */
  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 */
  113.