1 | /**************************************************************************** |
2 | * |
3 | * psread.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 "psft.h" |
40 | #include <freetype/internal/ftdebug.h> |
41 | |
42 | #include "psglue.h" |
43 | |
44 | #include "pserror.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 | |