Visualization Library 2.0.0-b5

A lightweight C++ OpenGL middleware for 2D/3D graphics

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gxvmorx.c
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1 /***************************************************************************/
2 /* */
3 /* gxvmorx.c */
4 /* */
5 /* TrueTypeGX/AAT morx table validation (body). */
6 /* */
7 /* Copyright 2005, 2008 by */
8 /* suzuki toshiya, Masatake YAMATO, Red Hat K.K., */
9 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
10 /* */
11 /* This file is part of the FreeType project, and may only be used, */
12 /* modified, and distributed under the terms of the FreeType project */
13 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
14 /* this file you indicate that you have read the license and */
15 /* understand and accept it fully. */
16 /* */
17 /***************************************************************************/
18 
19 /***************************************************************************/
20 /* */
21 /* gxvalid is derived from both gxlayout module and otvalid module. */
22 /* Development of gxlayout is supported by the Information-technology */
23 /* Promotion Agency(IPA), Japan. */
24 /* */
25 /***************************************************************************/
26 
27 
28 #include "gxvmorx.h"
29 
30 
31  /*************************************************************************/
32  /* */
33  /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
34  /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
35  /* messages during execution. */
36  /* */
37 #undef FT_COMPONENT
38 #define FT_COMPONENT trace_gxvmorx
39 
40 
41  static void
42  gxv_morx_subtables_validate( FT_Bytes table,
44  FT_UShort nSubtables,
45  GXV_Validator valid )
46  {
47  FT_Bytes p = table;
48 
49  GXV_Validate_Func fmt_funcs_table[] =
50  {
54  NULL, /* 3 */
57 
58  };
59 
61 
62  FT_UShort i;
63 
64 
65  GXV_NAME_ENTER( "subtables in a chain" );
66 
67  for ( i = 0; i < nSubtables; i++ )
68  {
70  FT_ULong coverage;
71 #ifdef GXV_LOAD_UNUSED_VARS
72  FT_ULong subFeatureFlags;
73 #endif
74  FT_ULong type;
75  FT_ULong rest;
76 
77 
78  GXV_LIMIT_CHECK( 4 + 4 + 4 );
79  length = FT_NEXT_ULONG( p );
80  coverage = FT_NEXT_ULONG( p );
81 #ifdef GXV_LOAD_UNUSED_VARS
82  subFeatureFlags = FT_NEXT_ULONG( p );
83 #else
84  p += 4;
85 #endif
86 
87  GXV_TRACE(( "validating chain subtable %d/%d (%d bytes)\n",
88  i + 1, nSubtables, length ));
89 
90  type = coverage & 0x0007;
91  rest = length - ( 4 + 4 + 4 );
92  GXV_LIMIT_CHECK( rest );
93 
94  /* morx coverage consists of mort_coverage & 16bit padding */
95  gxv_mort_coverage_validate( (FT_UShort)( ( coverage >> 16 ) | coverage ),
96  valid );
97  if ( type > 5 )
99 
100  func = fmt_funcs_table[type];
101  if ( func == NULL )
102  GXV_TRACE(( "morx type %d is reserved\n", type ));
103 
104  func( p, p + rest, valid );
105 
106  /* TODO: subFeatureFlags should be unique in a table? */
107  p += rest;
108  }
109 
110  valid->subtable_length = p - table;
111 
112  GXV_EXIT;
113  }
114 
115 
116  static void
117  gxv_morx_chain_validate( FT_Bytes table,
118  FT_Bytes limit,
119  GXV_Validator valid )
120  {
121  FT_Bytes p = table;
122 #ifdef GXV_LOAD_UNUSED_VARS
123  FT_ULong defaultFlags;
124 #endif
125  FT_ULong chainLength;
126  FT_ULong nFeatureFlags;
127  FT_ULong nSubtables;
128 
129 
130  GXV_NAME_ENTER( "morx chain header" );
131 
132  GXV_LIMIT_CHECK( 4 + 4 + 4 + 4 );
133 #ifdef GXV_LOAD_UNUSED_VARS
134  defaultFlags = FT_NEXT_ULONG( p );
135 #else
136  p += 4;
137 #endif
138  chainLength = FT_NEXT_ULONG( p );
139  nFeatureFlags = FT_NEXT_ULONG( p );
140  nSubtables = FT_NEXT_ULONG( p );
141 
142  /* feature-array of morx is same with that of mort */
143  gxv_mort_featurearray_validate( p, limit, nFeatureFlags, valid );
144  p += valid->subtable_length;
145 
146  if ( nSubtables >= 0x10000L )
148 
149  gxv_morx_subtables_validate( p, table + chainLength,
150  (FT_UShort)nSubtables, valid );
151 
152  valid->subtable_length = chainLength;
153 
154  /* TODO: defaultFlags should be compared with the flags in tables */
155 
156  GXV_EXIT;
157  }
158 
159 
160  FT_LOCAL_DEF( void )
162  FT_Face face,
163  FT_Validator ftvalid )
164  {
165  GXV_ValidatorRec validrec;
166  GXV_Validator valid = &validrec;
167  FT_Bytes p = table;
168  FT_Bytes limit = 0;
170  FT_ULong nChains;
171  FT_ULong i;
172 
173 
174  valid->root = ftvalid;
175  valid->face = face;
176 
177  FT_TRACE3(( "validating `morx' table\n" ));
178  GXV_INIT;
179 
180  GXV_LIMIT_CHECK( 4 + 4 );
181  version = FT_NEXT_ULONG( p );
182  nChains = FT_NEXT_ULONG( p );
183 
184  if ( version != 0x00020000UL )
186 
187  for ( i = 0; i < nChains; i++ )
188  {
189  GXV_TRACE(( "validating chain %d/%d\n", i + 1, nChains ));
191  gxv_morx_chain_validate( p, limit, valid );
192  p += valid->subtable_length;
193  }
194 
195  FT_TRACE4(( "\n" ));
196  }
197 
198 
199 /* END */
GLenum GLuint GLenum GLsizei length
unsigned long FT_ULong
Definition: fttypes.h:249
GLfloat GLfloat p
#define FT_INVALID_FORMAT
Definition: ftvalid.h:133
#define NULL
Definition: ftobjs.h:61
#define GXV_NAME_ENTER(name)
Definition: gxvcommn.h:301
#define GXV_TRACE(s)
Definition: gxvcommn.h:304
png_uint_32 i
Definition: png.h:2640
GLenum GLuint GLint GLenum face
#define FT_TRACE4(varformat)
Definition: ftdebug.h:161
gxv_morx_subtable_type1_validate(FT_Bytes table, FT_Bytes limit, GXV_Validator valid)
Definition: gxvmorx1.c:240
gxv_morx_subtable_type5_validate(FT_Bytes table, FT_Bytes limit, GXV_Validator valid)
Definition: gxvmorx5.c:194
#define GXV_EXIT
Definition: gxvcommn.h:302
gxv_mort_featurearray_validate(FT_Bytes table, FT_Bytes limit, FT_ULong nFeatureFlags, GXV_Validator valid)
Definition: gxvmort.c:89
typedefFT_BEGIN_HEADER struct FT_ValidatorRec_ volatile * FT_Validator
Definition: ftvalid.h:42
gxv_morx_subtable_type4_validate(FT_Bytes table, FT_Bytes limit, GXV_Validator valid)
Definition: gxvmorx4.c:42
#define GXV_32BIT_ALIGNMENT_VALIDATE(a)
Definition: gxvcommn.h:317
int const char * version
Definition: zlib.h:813
const FT_Byte * FT_Bytes
Definition: fttypes.h:161
gxv_morx_subtable_type0_validate(FT_Bytes table, FT_Bytes limit, GXV_Validator valid)
Definition: gxvmorx0.c:86
GLenum type
#define FT_TRACE3(varformat)
Definition: ftdebug.h:160
FT_ULong subtable_length
Definition: gxvcommn.h:244
#define FT_NEXT_ULONG(buffer)
Definition: ftstream.h:238
GLenum func
FT_Validator root
Definition: gxvcommn.h:239
#define FT_INVALID_DATA
Definition: ftvalid.h:141
void(* GXV_Validate_Func)(FT_Bytes table, FT_Bytes limit, GXV_Validator valid)
Definition: gxvcommn.h:82
unsigned short FT_UShort
Definition: fttypes.h:205
GLenum GLsizei GLenum GLenum const GLvoid * table
#define GXV_INIT
Definition: gxvcommn.h:300
GLint limit
#define FT_LOCAL_DEF(x)
Definition: ftconfig.h:236
#define GXV_LIMIT_CHECK(_count)
Definition: gxvcommn.h:272
gxv_morx_validate(FT_Bytes table, FT_Face face, FT_Validator ftvalid)
Definition: gxvmorx.c:161
gxv_mort_coverage_validate(FT_UShort coverage, GXV_Validator valid)
Definition: gxvmort.c:121
gxv_morx_subtable_type2_validate(FT_Bytes table, FT_Bytes limit, GXV_Validator valid)
Definition: gxvmorx2.c:294