aboutsummaryrefslogtreecommitdiff
path: root/fontconfig/src/ftglue.c
blob: 91cb532b93fb754ed24df2c450f188fb507d7086 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
/* ftglue.c: Glue code for compiling the OpenType code from
 *           FreeType 1 using only the public API of FreeType 2
 *
 * By David Turner, The FreeType Project (www.freetype.org)
 *
 * This code is explicitely put in the public domain
 *
 * See ftglue.h for more information.
 */

#include "ftglue.h"

#if 0
#include <stdio.h>
#define  LOG(x)  ftglue_log x

static void
ftglue_log( const char*   format, ... )
{
  va_list  ap;

  va_start( ap, format );
  vfprintf( stderr, format, ap );
  va_end( ap );
}

#else
#define  LOG(x)  do {} while (0)
#endif

/* only used internally */
static FT_Pointer
ftglue_qalloc( FT_Memory  memory,
               FT_ULong   size,
               FT_Error  *perror )
{
  FT_Error    error = 0;
  FT_Pointer  block = NULL;

  if ( size > 0 )
  {
    block = memory->alloc( memory, size );
    if ( !block )
      error = FT_Err_Out_Of_Memory;
  }

  *perror = error;
  return block;
}

#undef   QALLOC  /* just in case */
#define  QALLOC(ptr,size)    ( (ptr) = ftglue_qalloc( memory, (size), &error ), error != 0 )
#define  FREE(_ptr)                    \
  do {                                 \
    if ( (_ptr) )                      \
    {                                  \
      ftglue_free( memory, _ptr );     \
      _ptr = NULL;                     \
    }                                  \
  } while (0)


static void
ftglue_free( FT_Memory   memory,
             FT_Pointer  block )
{
  if ( block )
    memory->free( memory, block );
}

FTGLUE_APIDEF( FT_Long )
ftglue_stream_pos( FT_Stream   stream )
{
  LOG(( "ftglue:stream:pos() -> %ld\n", stream->pos ));
  return stream->pos;
}


FTGLUE_APIDEF( FT_Error )
ftglue_stream_seek( FT_Stream   stream,
                    FT_Long     pos )
{
  FT_Error  error = 0;

  stream->pos = pos;
  if ( stream->read )
  {
    if ( stream->read( stream, pos, 0, 0 ) )
      error = FT_Err_Invalid_Stream_Operation;
  }
  else if ( pos > stream->size )
    error = FT_Err_Invalid_Stream_Operation;

  LOG(( "ftglue:stream:seek(%ld) -> %d\n", pos, error ));
  return error;
}


FTGLUE_APIDEF( FT_Error )
ftglue_stream_frame_enter( FT_Stream   stream,
                           FT_ULong    count )
{
  FT_Error  error = FT_Err_Ok;
  FT_ULong  read_bytes;

  if ( stream->read )
  {
    /* allocate the frame in memory */
    FT_Memory  memory = stream->memory;


    if ( QALLOC( stream->base, count ) )
      goto Exit;

    /* read it */
    read_bytes = stream->read( stream, stream->pos,
                               stream->base, count );
    if ( read_bytes < count )
    {
      FREE( stream->base );
      error = FT_Err_Invalid_Stream_Operation;
    }
    stream->cursor = stream->base;
    stream->limit  = stream->cursor + count;
    stream->pos   += read_bytes;
  }
  else
  {
    /* check current and new position */
    if ( stream->pos >= stream->size        ||
         stream->pos + count > stream->size )
    {
      error = FT_Err_Invalid_Stream_Operation;
      goto Exit;
    }

    /* set cursor */
    stream->cursor = stream->base + stream->pos;
    stream->limit  = stream->cursor + count;
    stream->pos   += count;
  }

Exit:
  LOG(( "ftglue:stream:frame_enter(%ld) -> %d\n", count, error ));
  return error;
}


FTGLUE_APIDEF( void )
ftglue_stream_frame_exit( FT_Stream  stream )
{
  if ( stream->read )
  {
    FT_Memory  memory = stream->memory;

    FREE( stream->base );
  }
  stream->cursor = 0;
  stream->limit  = 0;

  LOG(( "ftglue:stream:frame_exit()\n" ));
}


FTGLUE_APIDEF( FT_Error )
ftglue_face_goto_table( FT_Face    face,
                        FT_ULong   the_tag,
                        FT_Stream  stream )
{
  FT_Error  error;

  LOG(( "ftglue_face_goto_table( %p, %c%c%c%c, %p )\n",
                face,
                (int)((the_tag >> 24) & 0xFF),
                (int)((the_tag >> 16) & 0xFF),
                (int)((the_tag >> 8) & 0xFF),
                (int)(the_tag & 0xFF),
                stream ));

  if ( !FT_IS_SFNT(face) )
  {
    LOG(( "not a SFNT face !!\n" ));
    error = FT_Err_Invalid_Face_Handle;
  }
  else
  {
   /* parse the directory table directly, without using
    * FreeType's built-in data structures
    */
    FT_ULong  offset = 0, sig;
    FT_UInt   count, nn;

    if ( FILE_Seek( 0 ) || ACCESS_Frame( 4 ) )
      goto Exit;

    sig = GET_Tag4();

    FORGET_Frame();

    if ( sig == FT_MAKE_TAG( 't', 't', 'c', 'f' ) )
    {
      /* deal with TrueType collections */

      LOG(( ">> This is a TrueType Collection\n" ));

      if ( FILE_Seek( 12 + face->face_index*4 ) ||
           ACCESS_Frame( 4 )                    )
        goto Exit;

      offset = GET_ULong();

      FORGET_Frame();
    }

    LOG(( "TrueType offset = %ld\n", offset ));

    if ( FILE_Seek( offset+4 ) ||
         ACCESS_Frame( 2 )     )
      goto Exit;

    count = GET_UShort();

    FORGET_Frame();

    if ( FILE_Seek( offset+12 )   ||
         ACCESS_Frame( count*16 ) )
      goto Exit;

    for ( nn = 0; nn < count; nn++ )
    {
      FT_ULong  tag      = GET_ULong();
      FT_ULong  checksum = GET_ULong();
      FT_ULong  start    = GET_ULong();
      FT_ULong  size     = GET_ULong();

      FT_UNUSED(checksum);
      FT_UNUSED(size);

      if ( tag == the_tag )
      {
        LOG(( "TrueType table (start: %ld) (size: %ld)\n", start, size ));
        error = ftglue_stream_seek( stream, start );
        goto FoundIt;
      }
    }
    error = FT_Err_Table_Missing;

  FoundIt:
    FORGET_Frame();
  }

Exit:
  LOG(( "TrueType error=%d\n", error ));

  return error;
}

#undef QALLOC
#define __ftglue__
#include "fcaliastail.h"
#undef __ftglue__