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| 3918 | Serge | 1 | /***************************************************************************/ |
| 2 | /* */ |
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| 3 | /* gxvtrak.c */ |
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| 4 | /* */ |
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| 5 | /* TrueTypeGX/AAT trak table validation (body). */ |
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| 6 | /* */ |
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| 7 | /* Copyright 2004, 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */ |
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| 8 | /* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
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| 9 | /* */ |
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| 10 | /* This file is part of the FreeType project, and may only be used, */ |
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| 11 | /* modified, and distributed under the terms of the FreeType project */ |
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| 12 | /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
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| 13 | /* this file you indicate that you have read the license and */ |
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| 14 | /* understand and accept it fully. */ |
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| 15 | /* */ |
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| 16 | /***************************************************************************/ |
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| 17 | |||
| 18 | /***************************************************************************/ |
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| 19 | /* */ |
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| 20 | /* gxvalid is derived from both gxlayout module and otvalid module. */ |
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| 21 | /* Development of gxlayout is supported by the Information-technology */ |
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| 22 | /* Promotion Agency(IPA), Japan. */ |
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| 23 | /* */ |
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| 24 | /***************************************************************************/ |
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| 25 | |||
| 26 | |||
| 27 | #include "gxvalid.h" |
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| 28 | #include "gxvcommn.h" |
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| 29 | |||
| 30 | |||
| 31 | /*************************************************************************/ |
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| 32 | /* */ |
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| 33 | /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
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| 34 | /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
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| 35 | /* messages during execution. */ |
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| 36 | /* */ |
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| 37 | #undef FT_COMPONENT |
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| 38 | #define FT_COMPONENT trace_gxvtrak |
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| 39 | |||
| 40 | |||
| 41 | /*************************************************************************/ |
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| 42 | /*************************************************************************/ |
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| 43 | /***** *****/ |
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| 44 | /***** Data and Types *****/ |
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| 45 | /***** *****/ |
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| 46 | /*************************************************************************/ |
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| 47 | /*************************************************************************/ |
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| 48 | |||
| 49 | /* |
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| 50 | * referred track table format specification: |
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| 51 | * http://developer.apple.com/fonts/TTRefMan/RM06/Chap6trak.html |
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| 52 | * last update was 1996. |
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| 53 | * ---------------------------------------------- |
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| 54 | * [MINIMUM HEADER]: GXV_TRAK_SIZE_MIN |
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| 55 | * version (fixed: 32bit) = 0x00010000 |
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| 56 | * format (uint16: 16bit) = 0 is only defined (1996) |
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| 57 | * horizOffset (uint16: 16bit) |
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| 58 | * vertOffset (uint16: 16bit) |
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| 59 | * reserved (uint16: 16bit) = 0 |
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| 60 | * ---------------------------------------------- |
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| 61 | * [VARIABLE BODY]: |
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| 62 | * horizData |
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| 63 | * header ( 2 + 2 + 4 |
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| 64 | * trackTable + nTracks * ( 4 + 2 + 2 ) |
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| 65 | * sizeTable + nSizes * 4 ) |
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| 66 | * ---------------------------------------------- |
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| 67 | * vertData |
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| 68 | * header ( 2 + 2 + 4 |
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| 69 | * trackTable + nTracks * ( 4 + 2 + 2 ) |
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| 70 | * sizeTable + nSizes * 4 ) |
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| 71 | * ---------------------------------------------- |
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| 72 | */ |
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| 73 | typedef struct GXV_trak_DataRec_ |
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| 74 | { |
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| 75 | FT_UShort trackValueOffset_min; |
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| 76 | FT_UShort trackValueOffset_max; |
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| 77 | |||
| 78 | } GXV_trak_DataRec, *GXV_trak_Data; |
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| 79 | |||
| 80 | |||
| 81 | #define GXV_TRAK_DATA( FIELD ) GXV_TABLE_DATA( trak, FIELD ) |
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| 82 | |||
| 83 | |||
| 84 | /*************************************************************************/ |
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| 85 | /*************************************************************************/ |
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| 86 | /***** *****/ |
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| 87 | /***** UTILITY FUNCTIONS *****/ |
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| 88 | /***** *****/ |
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| 89 | /*************************************************************************/ |
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| 90 | /*************************************************************************/ |
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| 91 | |||
| 92 | static void |
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| 93 | gxv_trak_trackTable_validate( FT_Bytes table, |
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| 94 | FT_Bytes limit, |
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| 95 | FT_UShort nTracks, |
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| 96 | GXV_Validator valid ) |
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| 97 | { |
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| 98 | FT_Bytes p = table; |
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| 99 | |||
| 100 | FT_Fixed track, t; |
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| 101 | FT_UShort nameIndex; |
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| 102 | FT_UShort offset; |
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| 103 | FT_UShort i, j; |
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| 104 | |||
| 105 | |||
| 106 | GXV_NAME_ENTER( "trackTable" ); |
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| 107 | |||
| 108 | GXV_TRAK_DATA( trackValueOffset_min ) = 0xFFFFU; |
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| 109 | GXV_TRAK_DATA( trackValueOffset_max ) = 0x0000; |
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| 110 | |||
| 111 | GXV_LIMIT_CHECK( nTracks * ( 4 + 2 + 2 ) ); |
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| 112 | |||
| 113 | for ( i = 0; i < nTracks; i ++ ) |
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| 114 | { |
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| 115 | p = table + i * ( 4 + 2 + 2 ); |
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| 116 | track = FT_NEXT_LONG( p ); |
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| 117 | nameIndex = FT_NEXT_USHORT( p ); |
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| 118 | offset = FT_NEXT_USHORT( p ); |
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| 119 | |||
| 120 | if ( offset < GXV_TRAK_DATA( trackValueOffset_min ) ) |
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| 121 | GXV_TRAK_DATA( trackValueOffset_min ) = offset; |
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| 122 | if ( offset > GXV_TRAK_DATA( trackValueOffset_max ) ) |
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| 123 | GXV_TRAK_DATA( trackValueOffset_max ) = offset; |
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| 124 | |||
| 125 | gxv_sfntName_validate( nameIndex, 256, 32767, valid ); |
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| 126 | |||
| 127 | for ( j = i; j < nTracks; j ++ ) |
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| 128 | { |
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| 129 | p = table + j * ( 4 + 2 + 2 ); |
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| 130 | t = FT_NEXT_LONG( p ); |
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| 131 | if ( t == track ) |
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| 132 | GXV_TRACE(( "duplicated entries found for track value 0x%x\n", |
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| 133 | track )); |
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| 134 | } |
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| 135 | } |
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| 136 | |||
| 137 | valid->subtable_length = p - table; |
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| 138 | GXV_EXIT; |
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| 139 | } |
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| 140 | |||
| 141 | |||
| 142 | static void |
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| 143 | gxv_trak_trackData_validate( FT_Bytes table, |
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| 144 | FT_Bytes limit, |
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| 145 | GXV_Validator valid ) |
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| 146 | { |
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| 147 | FT_Bytes p = table; |
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| 148 | FT_UShort nTracks; |
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| 149 | FT_UShort nSizes; |
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| 150 | FT_ULong sizeTableOffset; |
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| 151 | |||
| 152 | GXV_ODTECT( 4, odtect ); |
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| 153 | |||
| 154 | |||
| 155 | GXV_ODTECT_INIT( odtect ); |
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| 156 | GXV_NAME_ENTER( "trackData" ); |
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| 157 | |||
| 158 | /* read the header of trackData */ |
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| 159 | GXV_LIMIT_CHECK( 2 + 2 + 4 ); |
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| 160 | nTracks = FT_NEXT_USHORT( p ); |
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| 161 | nSizes = FT_NEXT_USHORT( p ); |
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| 162 | sizeTableOffset = FT_NEXT_ULONG( p ); |
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| 163 | |||
| 164 | gxv_odtect_add_range( table, p - table, "trackData header", odtect ); |
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| 165 | |||
| 166 | /* validate trackTable */ |
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| 167 | gxv_trak_trackTable_validate( p, limit, nTracks, valid ); |
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| 168 | gxv_odtect_add_range( p, valid->subtable_length, |
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| 169 | "trackTable", odtect ); |
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| 170 | |||
| 171 | /* sizeTable is array of FT_Fixed, don't check contents */ |
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| 172 | p = valid->root->base + sizeTableOffset; |
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| 173 | GXV_LIMIT_CHECK( nSizes * 4 ); |
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| 174 | gxv_odtect_add_range( p, nSizes * 4, "sizeTable", odtect ); |
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| 175 | |||
| 176 | /* validate trackValueOffet */ |
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| 177 | p = valid->root->base + GXV_TRAK_DATA( trackValueOffset_min ); |
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| 178 | if ( limit - p < nTracks * nSizes * 2 ) |
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| 179 | GXV_TRACE(( "too short trackValue array\n" )); |
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| 180 | |||
| 181 | p = valid->root->base + GXV_TRAK_DATA( trackValueOffset_max ); |
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| 182 | GXV_LIMIT_CHECK( nSizes * 2 ); |
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| 183 | |||
| 184 | gxv_odtect_add_range( valid->root->base |
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| 185 | + GXV_TRAK_DATA( trackValueOffset_min ), |
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| 186 | GXV_TRAK_DATA( trackValueOffset_max ) |
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| 187 | - GXV_TRAK_DATA( trackValueOffset_min ) |
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| 188 | + nSizes * 2, |
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| 189 | "trackValue array", odtect ); |
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| 190 | |||
| 191 | gxv_odtect_validate( odtect, valid ); |
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| 192 | |||
| 193 | GXV_EXIT; |
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| 194 | } |
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| 195 | |||
| 196 | |||
| 197 | /*************************************************************************/ |
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| 198 | /*************************************************************************/ |
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| 199 | /***** *****/ |
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| 200 | /***** trak TABLE *****/ |
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| 201 | /***** *****/ |
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| 202 | /*************************************************************************/ |
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| 203 | /*************************************************************************/ |
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| 204 | |||
| 205 | FT_LOCAL_DEF( void ) |
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| 206 | gxv_trak_validate( FT_Bytes table, |
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| 207 | FT_Face face, |
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| 208 | FT_Validator ftvalid ) |
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| 209 | { |
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| 210 | FT_Bytes p = table; |
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| 211 | FT_Bytes limit = 0; |
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| 212 | |||
| 213 | GXV_ValidatorRec validrec; |
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| 214 | GXV_Validator valid = &validrec; |
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| 215 | GXV_trak_DataRec trakrec; |
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| 216 | GXV_trak_Data trak = &trakrec; |
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| 217 | |||
| 218 | FT_ULong version; |
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| 219 | FT_UShort format; |
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| 220 | FT_UShort horizOffset; |
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| 221 | FT_UShort vertOffset; |
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| 222 | FT_UShort reserved; |
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| 223 | |||
| 224 | |||
| 225 | GXV_ODTECT( 3, odtect ); |
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| 226 | |||
| 227 | GXV_ODTECT_INIT( odtect ); |
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| 228 | valid->root = ftvalid; |
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| 229 | valid->table_data = trak; |
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| 230 | valid->face = face; |
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| 231 | |||
| 232 | limit = valid->root->limit; |
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| 233 | |||
| 234 | FT_TRACE3(( "validating `trak' table\n" )); |
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| 235 | GXV_INIT; |
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| 236 | |||
| 237 | GXV_LIMIT_CHECK( 4 + 2 + 2 + 2 + 2 ); |
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| 238 | version = FT_NEXT_ULONG( p ); |
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| 239 | format = FT_NEXT_USHORT( p ); |
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| 240 | horizOffset = FT_NEXT_USHORT( p ); |
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| 241 | vertOffset = FT_NEXT_USHORT( p ); |
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| 242 | reserved = FT_NEXT_USHORT( p ); |
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| 243 | |||
| 244 | GXV_TRACE(( " (version = 0x%08x)\n", version )); |
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| 245 | GXV_TRACE(( " (format = 0x%04x)\n", format )); |
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| 246 | GXV_TRACE(( " (horizOffset = 0x%04x)\n", horizOffset )); |
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| 247 | GXV_TRACE(( " (vertOffset = 0x%04x)\n", vertOffset )); |
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| 248 | GXV_TRACE(( " (reserved = 0x%04x)\n", reserved )); |
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| 249 | |||
| 250 | /* Version 1.0 (always:1996) */ |
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| 251 | if ( version != 0x00010000UL ) |
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| 252 | FT_INVALID_FORMAT; |
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| 253 | |||
| 254 | /* format 0 (always:1996) */ |
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| 255 | if ( format != 0x0000 ) |
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| 256 | FT_INVALID_FORMAT; |
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| 257 | |||
| 258 | GXV_32BIT_ALIGNMENT_VALIDATE( horizOffset ); |
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| 259 | GXV_32BIT_ALIGNMENT_VALIDATE( vertOffset ); |
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| 260 | |||
| 261 | /* Reserved Fixed Value (always) */ |
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| 262 | if ( reserved != 0x0000 ) |
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| 263 | FT_INVALID_DATA; |
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| 264 | |||
| 265 | /* validate trackData */ |
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| 266 | if ( 0 < horizOffset ) |
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| 267 | { |
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| 268 | gxv_trak_trackData_validate( table + horizOffset, limit, valid ); |
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| 269 | gxv_odtect_add_range( table + horizOffset, valid->subtable_length, |
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| 270 | "horizJustData", odtect ); |
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| 271 | } |
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| 272 | |||
| 273 | if ( 0 < vertOffset ) |
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| 274 | { |
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| 275 | gxv_trak_trackData_validate( table + vertOffset, limit, valid ); |
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| 276 | gxv_odtect_add_range( table + vertOffset, valid->subtable_length, |
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| 277 | "vertJustData", odtect ); |
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| 278 | } |
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| 279 | |||
| 280 | gxv_odtect_validate( odtect, valid ); |
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| 281 | |||
| 282 | FT_TRACE4(( "\n" )); |
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| 283 | } |
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| 284 | |||
| 285 | |||
| 286 | /* END */ |