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| 1 /***************************************************************************/ | |
| 2 /* */ | |
| 3 /* ftvalid.h */ | |
| 4 /* */ | |
| 5 /* FreeType validation support (specification). */ | |
| 6 /* */ | |
| 7 /* Copyright 2004, 2013 by */ | |
| 8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ | |
| 9 /* */ | |
| 10 /* This file is part of the FreeType project, and may only be used, */ | |
| 11 /* modified, and distributed under the terms of the FreeType project */ | |
| 12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ | |
| 13 /* this file you indicate that you have read the license and */ | |
| 14 /* understand and accept it fully. */ | |
| 15 /* */ | |
| 16 /***************************************************************************/ | |
| 17 | |
| 18 | |
| 19 #ifndef __FTVALID_H__ | |
| 20 #define __FTVALID_H__ | |
| 21 | |
| 22 #include <ft2build.h> | |
| 23 #include FT_CONFIG_STANDARD_LIBRARY_H /* for ft_setjmp and ft_longjmp */ | |
| 24 | |
| 25 | |
| 26 FT_BEGIN_HEADER | |
| 27 | |
| 28 | |
| 29 /*************************************************************************/ | |
| 30 /*************************************************************************/ | |
| 31 /*************************************************************************/ | |
| 32 /**** ****/ | |
| 33 /**** ****/ | |
| 34 /**** V A L I D A T I O N ****/ | |
| 35 /**** ****/ | |
| 36 /**** ****/ | |
| 37 /*************************************************************************/ | |
| 38 /*************************************************************************/ | |
| 39 /*************************************************************************/ | |
| 40 | |
| 41 /* handle to a validation object */ | |
| 42 typedef struct FT_ValidatorRec_ volatile* FT_Validator; | |
| 43 | |
| 44 | |
| 45 /*************************************************************************/ | |
| 46 /* */ | |
| 47 /* There are three distinct validation levels defined here: */ | |
| 48 /* */ | |
| 49 /* FT_VALIDATE_DEFAULT :: */ | |
| 50 /* A table that passes this validation level can be used reliably by */ | |
| 51 /* FreeType. It generally means that all offsets have been checked to */ | |
| 52 /* prevent out-of-bound reads, that array counts are correct, etc. */ | |
| 53 /* */ | |
| 54 /* FT_VALIDATE_TIGHT :: */ | |
| 55 /* A table that passes this validation level can be used reliably and */ | |
| 56 /* doesn't contain invalid data. For example, a charmap table that */ | |
| 57 /* returns invalid glyph indices will not pass, even though it can */ | |
| 58 /* be used with FreeType in default mode (the library will simply */ | |
| 59 /* return an error later when trying to load the glyph). */ | |
| 60 /* */ | |
| 61 /* It also checks that fields which must be a multiple of 2, 4, or 8, */ | |
| 62 /* don't have incorrect values, etc. */ | |
| 63 /* */ | |
| 64 /* FT_VALIDATE_PARANOID :: */ | |
| 65 /* Only for font debugging. Checks that a table follows the */ | |
| 66 /* specification by 100%. Very few fonts will be able to pass this */ | |
| 67 /* level anyway but it can be useful for certain tools like font */ | |
| 68 /* editors/converters. */ | |
| 69 /* */ | |
| 70 typedef enum FT_ValidationLevel_ | |
| 71 { | |
| 72 FT_VALIDATE_DEFAULT = 0, | |
| 73 FT_VALIDATE_TIGHT, | |
| 74 FT_VALIDATE_PARANOID | |
| 75 | |
| 76 } FT_ValidationLevel; | |
| 77 | |
| 78 | |
| 79 #if defined( _MSC_VER ) /* Visual C++ (and Intel C++) */ | |
| 80 /* We disable the warning `structure was padded due to */ | |
| 81 /* __declspec(align())' in order to compile cleanly with */ | |
| 82 /* the maximum level of warnings. */ | |
| 83 #pragma warning( push ) | |
| 84 #pragma warning( disable : 4324 ) | |
| 85 #endif /* _MSC_VER */ | |
| 86 | |
| 87 /* validator structure */ | |
| 88 typedef struct FT_ValidatorRec_ | |
| 89 { | |
| 90 const FT_Byte* base; /* address of table in memory */ | |
| 91 const FT_Byte* limit; /* `base' + sizeof(table) in memory */ | |
| 92 FT_ValidationLevel level; /* validation level */ | |
| 93 FT_Error error; /* error returned. 0 means success */ | |
| 94 | |
| 95 ft_jmp_buf jump_buffer; /* used for exception handling */ | |
| 96 | |
| 97 } FT_ValidatorRec; | |
| 98 | |
| 99 #if defined( _MSC_VER ) | |
| 100 #pragma warning( pop ) | |
| 101 #endif | |
| 102 | |
| 103 #define FT_VALIDATOR( x ) ( (FT_Validator)( x ) ) | |
| 104 | |
| 105 | |
| 106 FT_BASE( void ) | |
| 107 ft_validator_init( FT_Validator valid, | |
| 108 const FT_Byte* base, | |
| 109 const FT_Byte* limit, | |
| 110 FT_ValidationLevel level ); | |
| 111 | |
| 112 /* Do not use this. It's broken and will cause your validator to crash */ | |
| 113 /* if you run it on an invalid font. */ | |
| 114 FT_BASE( FT_Int ) | |
| 115 ft_validator_run( FT_Validator valid ); | |
| 116 | |
| 117 /* Sets the error field in a validator, then calls `longjmp' to return */ | |
| 118 /* to high-level caller. Using `setjmp/longjmp' avoids many stupid */ | |
| 119 /* error checks within the validation routines. */ | |
| 120 /* */ | |
| 121 FT_BASE( void ) | |
| 122 ft_validator_error( FT_Validator valid, | |
| 123 FT_Error error ); | |
| 124 | |
| 125 | |
| 126 /* Calls ft_validate_error. Assumes that the `valid' local variable */ | |
| 127 /* holds a pointer to the current validator object. */ | |
| 128 /* */ | |
| 129 /* Use preprocessor prescan to pass FT_ERR_PREFIX. */ | |
| 130 /* */ | |
| 131 #define FT_INVALID( _prefix, _error ) FT_INVALID_( _prefix, _error ) | |
| 132 #define FT_INVALID_( _prefix, _error ) \ | |
| 133 ft_validator_error( valid, _prefix ## _error ) | |
| 134 | |
| 135 /* called when a broken table is detected */ | |
| 136 #define FT_INVALID_TOO_SHORT \ | |
| 137 FT_INVALID( FT_ERR_PREFIX, Invalid_Table ) | |
| 138 | |
| 139 /* called when an invalid offset is detected */ | |
| 140 #define FT_INVALID_OFFSET \ | |
| 141 FT_INVALID( FT_ERR_PREFIX, Invalid_Offset ) | |
| 142 | |
| 143 /* called when an invalid format/value is detected */ | |
| 144 #define FT_INVALID_FORMAT \ | |
| 145 FT_INVALID( FT_ERR_PREFIX, Invalid_Table ) | |
| 146 | |
| 147 /* called when an invalid glyph index is detected */ | |
| 148 #define FT_INVALID_GLYPH_ID \ | |
| 149 FT_INVALID( FT_ERR_PREFIX, Invalid_Glyph_Index ) | |
| 150 | |
| 151 /* called when an invalid field value is detected */ | |
| 152 #define FT_INVALID_DATA \ | |
| 153 FT_INVALID( FT_ERR_PREFIX, Invalid_Table ) | |
| 154 | |
| 155 | |
| 156 FT_END_HEADER | |
| 157 | |
| 158 #endif /* __FTVALID_H__ */ | |
| 159 | |
| 160 | |
| 161 /* END */ | |
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Chromium Code Reviews
Issue 1413673003:
Update bundled freetype to 2.6.1 (Closed)
Base URL: https://pdfium.googlesource.com/pdfium.git@master