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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 "../../include/freetype/internal/ftdebug.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 */ | |
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