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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 buf->ptr >= buf->end; |
| 109 } |
| 110 |
| 111 |
| 112 /* END */ |
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