| /***************************************************************************/ |
| /* */ |
| /* cf2read.c */ |
| /* */ |
| /* Adobe's code for stream handling (body). */ |
| /* */ |
| /* Copyright 2007-2013 Adobe Systems Incorporated. */ |
| /* */ |
| /* This software, and all works of authorship, whether in source or */ |
| /* object code form as indicated by the copyright notice(s) included */ |
| /* herein (collectively, the "Work") is made available, and may only be */ |
| /* used, modified, and distributed under the FreeType Project License, */ |
| /* LICENSE.TXT. Additionally, subject to the terms and conditions of the */ |
| /* FreeType Project License, each contributor to the Work hereby grants */ |
| /* to any individual or legal entity exercising permissions granted by */ |
| /* the FreeType Project License and this section (hereafter, "You" or */ |
| /* "Your") a perpetual, worldwide, non-exclusive, no-charge, */ |
| /* royalty-free, irrevocable (except as stated in this section) patent */ |
| /* license to make, have made, use, offer to sell, sell, import, and */ |
| /* otherwise transfer the Work, where such license applies only to those */ |
| /* patent claims licensable by such contributor that are necessarily */ |
| /* infringed by their contribution(s) alone or by combination of their */ |
| /* contribution(s) with the Work to which such contribution(s) was */ |
| /* submitted. If You institute patent litigation against any entity */ |
| /* (including a cross-claim or counterclaim in a lawsuit) alleging that */ |
| /* the Work or a contribution incorporated within the Work constitutes */ |
| /* direct or contributory patent infringement, then any patent licenses */ |
| /* granted to You under this License for that Work shall terminate as of */ |
| /* the date such litigation is filed. */ |
| /* */ |
| /* By using, modifying, or distributing the Work you indicate that you */ |
| /* have read and understood the terms and conditions of the */ |
| /* FreeType Project License as well as those provided in this section, */ |
| /* and you accept them fully. */ |
| /* */ |
| /***************************************************************************/ |
| |
| |
| #include "cf2ft.h" |
| #include FT_INTERNAL_DEBUG_H |
| |
| #include "cf2glue.h" |
| |
| #include "cf2error.h" |
| |
| |
| /* Define CF2_IO_FAIL as 1 to enable random errors and random */ |
| /* value errors in I/O. */ |
| #define CF2_IO_FAIL 0 |
| |
| |
| #if CF2_IO_FAIL |
| |
| /* set the .00 value to a nonzero probability */ |
| static int |
| randomError2( void ) |
| { |
| /* for region buffer ReadByte (interp) function */ |
| return (double)rand() / RAND_MAX < .00; |
| } |
| |
| /* set the .00 value to a nonzero probability */ |
| static CF2_Int |
| randomValue() |
| { |
| return (double)rand() / RAND_MAX < .00 ? rand() : 0; |
| } |
| |
| #endif /* CF2_IO_FAIL */ |
| |
| |
| /* Region Buffer */ |
| /* */ |
| /* Can be constructed from a copied buffer managed by */ |
| /* `FCM_getDatablock'. */ |
| /* Reads bytes with check for end of buffer. */ |
| |
| /* reading past the end of the buffer sets error and returns zero */ |
| FT_LOCAL_DEF( CF2_Int ) |
| cf2_buf_readByte( CF2_Buffer buf ) |
| { |
| if ( buf->ptr < buf->end ) |
| { |
| #if CF2_IO_FAIL |
| if ( randomError2() ) |
| { |
| CF2_SET_ERROR( buf->error, Invalid_Stream_Operation ); |
| return 0; |
| } |
| |
| return *(buf->ptr)++ + randomValue(); |
| #else |
| return *(buf->ptr)++; |
| #endif |
| } |
| else |
| { |
| CF2_SET_ERROR( buf->error, Invalid_Stream_Operation ); |
| return 0; |
| } |
| } |
| |
| |
| /* note: end condition can occur without error */ |
| FT_LOCAL_DEF( FT_Bool ) |
| cf2_buf_isEnd( CF2_Buffer buf ) |
| { |
| return (FT_Bool)( buf->ptr >= buf->end ); |
| } |
| |
| |
| /* END */ |
