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 FT_INTERNAL_DEBUG_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 */