psread.c (3522B)
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 */