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freetype2/src/cff/cffload.c

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43 KiB
C
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/***************************************************************************/
/* */
/* cffload.c */
/* */
/* OpenType and CFF data/program tables loader (body). */
/* */
/* Copyright 1996-2001, 2002, 2003 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
/* modified, and distributed under the terms of the FreeType project */
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
/* this file you indicate that you have read the license and */
/* understand and accept it fully. */
/* */
/***************************************************************************/
#include <ft2build.h>
#include FT_INTERNAL_DEBUG_H
#include FT_INTERNAL_OBJECTS_H
#include FT_INTERNAL_STREAM_H
#include FT_SERVICE_POSTSCRIPT_CMAPS_H
#include FT_TRUETYPE_TAGS_H
#include "cffload.h"
#include "cffparse.h"
#include "cfferrs.h"
#if 1
static const FT_UShort cff_isoadobe_charset[229] =
{
0,
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
};
static const FT_UShort cff_expert_charset[166] =
{
0,
1,
229,
230,
231,
232,
233,
234,
235,
236,
237,
238,
13,
14,
15,
99,
239,
240,
241,
242,
243,
244,
245,
246,
247,
248,
27,
28,
249,
250,
251,
252,
253,
254,
255,
256,
257,
258,
259,
260,
261,
262,
263,
264,
265,
266,
109,
110,
267,
268,
269,
270,
271,
272,
273,
274,
275,
276,
277,
278,
279,
280,
281,
282,
283,
284,
285,
286,
287,
288,
289,
290,
291,
292,
293,
294,
295,
296,
297,
298,
299,
300,
301,
302,
303,
304,
305,
306,
307,
308,
309,
310,
311,
312,
313,
314,
315,
316,
317,
318,
158,
155,
163,
319,
320,
321,
322,
323,
324,
325,
326,
150,
164,
169,
327,
328,
329,
330,
331,
332,
333,
334,
335,
336,
337,
338,
339,
340,
341,
342,
343,
344,
345,
346,
347,
348,
349,
350,
351,
352,
353,
354,
355,
356,
357,
358,
359,
360,
361,
362,
363,
364,
365,
366,
367,
368,
369,
370,
371,
372,
373,
374,
375,
376,
377,
378
};
static const FT_UShort cff_expertsubset_charset[87] =
{
0,
1,
231,
232,
235,
236,
237,
238,
13,
14,
15,
99,
239,
240,
241,
242,
243,
244,
245,
246,
247,
248,
27,
28,
249,
250,
251,
253,
254,
255,
256,
257,
258,
259,
260,
261,
262,
263,
264,
265,
266,
109,
110,
267,
268,
269,
270,
272,
300,
301,
302,
305,
314,
315,
158,
155,
163,
320,
321,
322,
323,
324,
325,
326,
150,
164,
169,
327,
328,
329,
330,
331,
332,
333,
334,
335,
336,
337,
338,
339,
340,
341,
342,
343,
344,
345,
346
};
static const FT_UShort cff_standard_encoding[256] =
{
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
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,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
96,
97,
98,
99,
100,
101,
102,
103,
104,
105,
106,
107,
108,
109,
110,
0,
111,
112,
113,
114,
0,
115,
116,
117,
118,
119,
120,
121,
122,
0,
123,
0,
124,
125,
126,
127,
128,
129,
130,
131,
0,
132,
133,
0,
134,
135,
136,
137,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
138,
0,
139,
0,
0,
0,
0,
140,
141,
142,
143,
0,
0,
0,
0,
0,
144,
0,
0,
0,
145,
0,
0,
146,
147,
148,
149,
0,
0,
0,
0
};
static const FT_UShort cff_expert_encoding[256] =
{
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
1,
229,
230,
0,
231,
232,
233,
234,
235,
236,
237,
238,
13,
14,
15,
99,
239,
240,
241,
242,
243,
244,
245,
246,
247,
248,
27,
28,
249,
250,
251,
252,
0,
253,
254,
255,
256,
257,
0,
0,
0,
258,
0,
0,
259,
260,
261,
262,
0,
0,
263,
264,
265,
0,
266,
109,
110,
267,
268,
269,
0,
270,
271,
272,
273,
274,
275,
276,
277,
278,
279,
280,
281,
282,
283,
284,
285,
286,
287,
288,
289,
290,
291,
292,
293,
294,
295,
296,
297,
298,
299,
300,
301,
302,
303,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
304,
305,
306,
0,
0,
307,
308,
309,
310,
311,
0,
312,
0,
0,
312,
0,
0,
314,
315,
0,
0,
316,
317,
318,
0,
0,
0,
158,
155,
163,
319,
320,
321,
322,
323,
324,
325,
0,
0,
326,
150,
164,
169,
327,
328,
329,
330,
331,
332,
333,
334,
335,
336,
337,
338,
339,
340,
341,
342,
343,
344,
345,
346,
347,
348,
349,
350,
351,
352,
353,
354,
355,
356,
357,
358,
359,
360,
361,
362,
363,
364,
365,
366,
367,
368,
369,
370,
371,
372,
373,
374,
375,
376,
377,
378
};
#endif
FT_LOCAL_DEF( FT_UShort )
cff_get_standard_encoding( FT_UInt charcode )
{
return (FT_UShort)(charcode < 256 ? cff_standard_encoding[charcode] : 0);
}
/*************************************************************************/
/* */
/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
/* messages during execution. */
/* */
#undef FT_COMPONENT
#define FT_COMPONENT trace_cffload
/* read a CFF offset from memory */
static FT_ULong
cff_get_offset( FT_Byte* p,
FT_Byte off_size )
{
FT_ULong result;
for ( result = 0; off_size > 0; off_size-- )
{
result <<= 8;
result |= *p++;
}
return result;
}
static FT_Error
cff_new_index( CFF_Index idx,
FT_Stream stream,
FT_Bool load )
{
FT_Error error;
FT_Memory memory = stream->memory;
FT_UShort count;
FT_MEM_ZERO( idx, sizeof ( *idx ) );
idx->stream = stream;
if ( !FT_READ_USHORT( count ) &&
count > 0 )
{
FT_Byte* p;
FT_Byte offsize;
FT_ULong data_size;
FT_ULong* poff;
/* there is at least one element; read the offset size, */
/* then access the offset table to compute the index's total size */
if ( FT_READ_BYTE( offsize ) )
goto Exit;
idx->stream = stream;
idx->count = count;
idx->off_size = offsize;
data_size = (FT_ULong)( count + 1 ) * offsize;
if ( FT_NEW_ARRAY( idx->offsets, count + 1 ) ||
FT_FRAME_ENTER( data_size ) )
goto Exit;
poff = idx->offsets;
p = (FT_Byte*)stream->cursor;
for ( ; (FT_Short)count >= 0; count-- )
{
poff[0] = cff_get_offset( p, offsize );
poff++;
p += offsize;
}
FT_FRAME_EXIT();
idx->data_offset = FT_STREAM_POS();
data_size = poff[-1] - 1;
if ( load )
{
/* load the data */
if ( FT_FRAME_EXTRACT( data_size, idx->bytes ) )
goto Exit;
}
else
{
/* skip the data */
if ( FT_STREAM_SKIP( data_size ) )
goto Exit;
}
}
Exit:
if ( error )
FT_FREE( idx->offsets );
return error;
}
static void
cff_done_index( CFF_Index idx )
{
if ( idx->stream )
{
FT_Stream stream = idx->stream;
FT_Memory memory = stream->memory;
if ( idx->bytes )
FT_FRAME_RELEASE( idx->bytes );
FT_FREE( idx->offsets );
FT_MEM_ZERO( idx, sizeof ( *idx ) );
}
}
/* allocate a table containing pointers to an index's elements */
static FT_Error
cff_index_get_pointers( CFF_Index idx,
FT_Byte*** table )
{
FT_Error error = 0;
FT_Memory memory = idx->stream->memory;
FT_ULong n, offset, old_offset;
FT_Byte** t;
*table = 0;
if ( idx->count > 0 && !FT_NEW_ARRAY( t, idx->count + 1 ) )
{
old_offset = 1;
for ( n = 0; n <= idx->count; n++ )
{
offset = idx->offsets[n];
if ( !offset )
offset = old_offset;
t[n] = idx->bytes + offset - 1;
old_offset = offset;
}
*table = t;
}
return error;
}
FT_LOCAL_DEF( FT_Error )
cff_index_access_element( CFF_Index idx,
FT_UInt element,
FT_Byte** pbytes,
FT_ULong* pbyte_len )
{
FT_Error error = CFF_Err_Ok;
if ( idx && idx->count > element )
{
/* compute start and end offsets */
FT_ULong off1, off2 = 0;
off1 = idx->offsets[element];
if ( off1 )
{
do
{
element++;
off2 = idx->offsets[element];
} while ( off2 == 0 && element < idx->count );
if ( !off2 )
off1 = 0;
}
/* access element */
if ( off1 )
{
*pbyte_len = off2 - off1;
if ( idx->bytes )
{
/* this index was completely loaded in memory, that's easy */
*pbytes = idx->bytes + off1 - 1;
}
else
{
/* this index is still on disk/file, access it through a frame */
FT_Stream stream = idx->stream;
if ( FT_STREAM_SEEK( idx->data_offset + off1 - 1 ) ||
FT_FRAME_EXTRACT( off2 - off1, *pbytes ) )
goto Exit;
}
}
else
{
/* empty index element */
*pbytes = 0;
*pbyte_len = 0;
}
}
else
error = CFF_Err_Invalid_Argument;
Exit:
return error;
}
FT_LOCAL_DEF( void )
cff_index_forget_element( CFF_Index idx,
FT_Byte** pbytes )
{
if ( idx->bytes == 0 )
{
FT_Stream stream = idx->stream;
FT_FRAME_RELEASE( *pbytes );
}
}
FT_LOCAL_DEF( FT_String* )
cff_index_get_name( CFF_Index idx,
FT_UInt element )
{
FT_Memory memory = idx->stream->memory;
FT_Byte* bytes;
FT_ULong byte_len;
FT_Error error;
FT_String* name = 0;
error = cff_index_access_element( idx, element, &bytes, &byte_len );
if ( error )
goto Exit;
if ( !FT_ALLOC( name, byte_len + 1 ) )
{
FT_MEM_COPY( name, bytes, byte_len );
name[byte_len] = 0;
}
cff_index_forget_element( idx, &bytes );
Exit:
return name;
}
FT_LOCAL_DEF( FT_String* )
cff_index_get_sid_string( CFF_Index idx,
FT_UInt sid,
FT_Service_PsCMaps psnames )
{
/* value 0xFFFFU indicates a missing dictionary entry */
if ( sid == 0xFFFFU )
return 0;
/* if it is not a standard string, return it */
if ( sid > 390 )
return cff_index_get_name( idx, sid - 391 );
/* CID-keyed CFF fonts don't have glyph names */
if ( !psnames )
return 0;
/* that's a standard string, fetch a copy from the PSName module */
{
FT_String* name = 0;
const char* adobe_name = psnames->adobe_std_strings( sid );
FT_UInt len;
if ( adobe_name )
{
FT_Memory memory = idx->stream->memory;
FT_Error error;
len = (FT_UInt)ft_strlen( adobe_name );
if ( !FT_ALLOC( name, len + 1 ) )
{
FT_MEM_COPY( name, adobe_name, len );
name[len] = 0;
}
FT_UNUSED( error );
}
return name;
}
}
/*************************************************************************/
/*************************************************************************/
/*** ***/
/*** FD Select table support ***/
/*** ***/
/*************************************************************************/
/*************************************************************************/
static void
CFF_Done_FD_Select( CFF_FDSelect fdselect,
FT_Stream stream )
{
if ( fdselect->data )
FT_FRAME_RELEASE( fdselect->data );
fdselect->data_size = 0;
fdselect->format = 0;
fdselect->range_count = 0;
}
static FT_Error
CFF_Load_FD_Select( CFF_FDSelect fdselect,
FT_UInt num_glyphs,
FT_Stream stream,
FT_ULong offset )
{
FT_Error error;
FT_Byte format;
FT_UInt num_ranges;
/* read format */
if ( FT_STREAM_SEEK( offset ) || FT_READ_BYTE( format ) )
goto Exit;
fdselect->format = format;
fdselect->cache_count = 0; /* clear cache */
switch ( format )
{
case 0: /* format 0, that's simple */
fdselect->data_size = num_glyphs;
goto Load_Data;
case 3: /* format 3, a tad more complex */
if ( FT_READ_USHORT( num_ranges ) )
goto Exit;
fdselect->data_size = num_ranges * 3 + 2;
Load_Data:
if ( FT_FRAME_EXTRACT( fdselect->data_size, fdselect->data ) )
goto Exit;
break;
default: /* hmm... that's wrong */
error = CFF_Err_Invalid_File_Format;
}
Exit:
return error;
}
FT_LOCAL_DEF( FT_Byte )
cff_fd_select_get( CFF_FDSelect fdselect,
FT_UInt glyph_index )
{
FT_Byte fd = 0;
switch ( fdselect->format )
{
case 0:
fd = fdselect->data[glyph_index];
break;
case 3:
/* first, compare to cache */
if ( (FT_UInt)( glyph_index - fdselect->cache_first ) <
fdselect->cache_count )
{
fd = fdselect->cache_fd;
break;
}
/* then, lookup the ranges array */
{
FT_Byte* p = fdselect->data;
FT_Byte* p_limit = p + fdselect->data_size;
FT_Byte fd2;
FT_UInt first, limit;
first = FT_NEXT_USHORT( p );
do
{
if ( glyph_index < first )
break;
fd2 = *p++;
limit = FT_NEXT_USHORT( p );
if ( glyph_index < limit )
{
fd = fd2;
/* update cache */
fdselect->cache_first = first;
fdselect->cache_count = limit-first;
fdselect->cache_fd = fd2;
break;
}
first = limit;
} while ( p < p_limit );
}
break;
default:
;
}
return fd;
}
/*************************************************************************/
/*************************************************************************/
/*** ***/
/*** CFF font support ***/
/*** ***/
/*************************************************************************/
/*************************************************************************/
static void
cff_charset_done( CFF_Charset charset,
FT_Stream stream )
{
FT_Memory memory = stream->memory;
FT_FREE( charset->sids );
FT_FREE( charset->cids );
charset->format = 0;
charset->offset = 0;
}
static FT_Error
cff_charset_load( CFF_Charset charset,
FT_UInt num_glyphs,
FT_Stream stream,
FT_ULong base_offset,
FT_ULong offset,
FT_Bool invert )
{
FT_Memory memory = stream->memory;
FT_Error error = 0;
FT_UShort glyph_sid;
/* If the the offset is greater than 2, we have to parse the */
/* charset table. */
if ( offset > 2 )
{
FT_UInt j;
charset->offset = base_offset + offset;
/* Get the format of the table. */
if ( FT_STREAM_SEEK( charset->offset ) ||
FT_READ_BYTE( charset->format ) )
goto Exit;
/* Allocate memory for sids. */
if ( FT_NEW_ARRAY( charset->sids, num_glyphs ) )
goto Exit;
/* assign the .notdef glyph */
charset->sids[0] = 0;
switch ( charset->format )
{
case 0:
if ( num_glyphs > 0 )
{
if ( FT_FRAME_ENTER( ( num_glyphs - 1 ) * 2 ) )
goto Exit;
for ( j = 1; j < num_glyphs; j++ )
charset->sids[j] = FT_GET_USHORT();
FT_FRAME_EXIT();
}
break;
case 1:
case 2:
{
FT_UInt nleft;
FT_UInt i;
j = 1;
while ( j < num_glyphs )
{
/* Read the first glyph sid of the range. */
if ( FT_READ_USHORT( glyph_sid ) )
goto Exit;
/* Read the number of glyphs in the range. */
if ( charset->format == 2 )
{
if ( FT_READ_USHORT( nleft ) )
goto Exit;
}
else
{
if ( FT_READ_BYTE( nleft ) )
goto Exit;
}
/* Fill in the range of sids -- `nleft + 1' glyphs. */
for ( i = 0; j < num_glyphs && i <= nleft; i++, j++, glyph_sid++ )
charset->sids[j] = glyph_sid;
}
}
break;
default:
FT_ERROR(( "cff_charset_load: invalid table format!\n" ));
error = CFF_Err_Invalid_File_Format;
goto Exit;
}
}
else
{
/* Parse default tables corresponding to offset == 0, 1, or 2. */
/* CFF specification intimates the following: */
/* */
/* In order to use a predefined charset, the following must be */
/* true: The charset constructed for the glyphs in the font's */
/* charstrings dictionary must match the predefined charset in */
/* the first num_glyphs. */
charset->offset = offset; /* record charset type */
switch ( (FT_UInt)offset )
{
case 0:
if ( num_glyphs > 229 )
{
FT_ERROR(( "cff_charset_load: implicit charset larger than\n"
"predefined charset (Adobe ISO-Latin)!\n" ));
error = CFF_Err_Invalid_File_Format;
goto Exit;
}
/* Allocate memory for sids. */
if ( FT_NEW_ARRAY( charset->sids, num_glyphs ) )
goto Exit;
/* Copy the predefined charset into the allocated memory. */
FT_ARRAY_COPY( charset->sids, cff_isoadobe_charset, num_glyphs );
break;
case 1:
if ( num_glyphs > 166 )
{
FT_ERROR(( "cff_charset_load: implicit charset larger than\n"
"predefined charset (Adobe Expert)!\n" ));
error = CFF_Err_Invalid_File_Format;
goto Exit;
}
/* Allocate memory for sids. */
if ( FT_NEW_ARRAY( charset->sids, num_glyphs ) )
goto Exit;
/* Copy the predefined charset into the allocated memory. */
FT_ARRAY_COPY( charset->sids, cff_expert_charset, num_glyphs );
break;
case 2:
if ( num_glyphs > 87 )
{
FT_ERROR(( "cff_charset_load: implicit charset larger than\n"
"predefined charset (Adobe Expert Subset)!\n" ));
error = CFF_Err_Invalid_File_Format;
goto Exit;
}
/* Allocate memory for sids. */
if ( FT_NEW_ARRAY( charset->sids, num_glyphs ) )
goto Exit;
/* Copy the predefined charset into the allocated memory. */
FT_ARRAY_COPY( charset->sids, cff_expertsubset_charset, num_glyphs );
break;
default:
error = CFF_Err_Invalid_File_Format;
goto Exit;
}
}
/* we have to invert the `sids' array for subsetted CID-keyed fonts */
if ( invert )
{
FT_UInt i;
FT_UShort max_cid = 0;
for ( i = 0; i < num_glyphs; i++ )
if ( charset->sids[i] > max_cid )
max_cid = charset->sids[i];
max_cid++;
if ( FT_NEW_ARRAY( charset->cids, max_cid ) )
goto Exit;
FT_MEM_ZERO( charset->cids, sizeof ( FT_UShort ) * max_cid );
for ( i = 0; i < num_glyphs; i++ )
charset->cids[charset->sids[i]] = i;
}
Exit:
/* Clean up if there was an error. */
if ( error )
{
FT_FREE( charset->sids );
FT_FREE( charset->cids );
charset->format = 0;
charset->offset = 0;
charset->sids = 0;
}
return error;
}
static void
cff_encoding_done( CFF_Encoding encoding )
{
encoding->format = 0;
encoding->offset = 0;
encoding->count = 0;
}
static FT_Error
cff_encoding_load( CFF_Encoding encoding,
CFF_Charset charset,
FT_UInt num_glyphs,
FT_Stream stream,
FT_ULong base_offset,
FT_ULong offset )
{
FT_Error error = 0;
FT_UInt count;
FT_UInt j;
FT_UShort glyph_sid;
FT_UInt glyph_code;
/* Check for charset->sids. If we do not have this, we fail. */
if ( !charset->sids )
{
error = CFF_Err_Invalid_File_Format;
goto Exit;
}
/* Zero out the code to gid/sid mappings. */
for ( j = 0; j < 256; j++ )
{
encoding->sids [j] = 0;
encoding->codes[j] = 0;
}
/* Note: The encoding table in a CFF font is indexed by glyph index; */
/* the first encoded glyph index is 1. Hence, we read the character */
/* code (`glyph_code') at index j and make the assignment: */
/* */
/* encoding->codes[glyph_code] = j + 1 */
/* */
/* We also make the assignment: */
/* */
/* encoding->sids[glyph_code] = charset->sids[j + 1] */
/* */
/* This gives us both a code to GID and a code to SID mapping. */
if ( offset > 1 )
{
encoding->offset = base_offset + offset;
/* we need to parse the table to determine its size */
if ( FT_STREAM_SEEK( encoding->offset ) ||
FT_READ_BYTE( encoding->format ) ||
FT_READ_BYTE( count ) )
goto Exit;
switch ( encoding->format & 0x7F )
{
case 0:
{
FT_Byte* p;
/* By convention, GID 0 is always ".notdef" and is never */
/* coded in the font. Hence, the number of codes found */
/* in the table is `count+1'. */
/* */
encoding->count = count + 1;
if ( FT_FRAME_ENTER( count ) )
goto Exit;
p = (FT_Byte*)stream->cursor;
for ( j = 1; j <= count; j++ )
{
glyph_code = *p++;
/* Make sure j is not too big. */
if ( j < num_glyphs )
{
/* Assign code to GID mapping. */
encoding->codes[glyph_code] = (FT_UShort)j;
/* Assign code to SID mapping. */
encoding->sids[glyph_code] = charset->sids[j];
}
}
FT_FRAME_EXIT();
}
break;
case 1:
{
FT_UInt nleft;
FT_UInt i = 1;
FT_UInt k;
encoding->count = 0;
/* Parse the Format1 ranges. */
for ( j = 0; j < count; j++, i += nleft )
{
/* Read the first glyph code of the range. */
if ( FT_READ_BYTE( glyph_code ) )
goto Exit;
/* Read the number of codes in the range. */
if ( FT_READ_BYTE( nleft ) )
goto Exit;
/* Increment nleft, so we read `nleft + 1' codes/sids. */
nleft++;
/* compute max number of character codes */
if ( (FT_UInt)nleft > encoding->count )
encoding->count = nleft;
/* Fill in the range of codes/sids. */
for ( k = i; k < nleft + i; k++, glyph_code++ )
{
/* Make sure k is not too big. */
if ( k < num_glyphs && glyph_code < 256 )
{
/* Assign code to GID mapping. */
encoding->codes[glyph_code] = (FT_UShort)k;
/* Assign code to SID mapping. */
encoding->sids[glyph_code] = charset->sids[k];
}
}
}
/* simple check; one never knows what can be found in a font */
if ( encoding->count > 256 )
encoding->count = 256;
}
break;
default:
FT_ERROR(( "cff_encoding_load: invalid table format!\n" ));
error = CFF_Err_Invalid_File_Format;
goto Exit;
}
/* Parse supplemental encodings, if any. */
if ( encoding->format & 0x80 )
{
FT_UInt gindex;
/* count supplements */
if ( FT_READ_BYTE( count ) )
goto Exit;
for ( j = 0; j < count; j++ )
{
/* Read supplemental glyph code. */
if ( FT_READ_BYTE( glyph_code ) )
goto Exit;
/* Read the SID associated with this glyph code. */
if ( FT_READ_USHORT( glyph_sid ) )
goto Exit;
/* Assign code to SID mapping. */
encoding->sids[glyph_code] = glyph_sid;
/* First, look up GID which has been assigned to */
/* SID glyph_sid. */
for ( gindex = 0; gindex < num_glyphs; gindex++ )
{
if ( charset->sids[gindex] == glyph_sid )
{
encoding->codes[glyph_code] = (FT_UShort)gindex;
break;
}
}
}
}
}
else
{
FT_UInt i;
/* We take into account the fact a CFF font can use a predefined */
/* encoding without containing all of the glyphs encoded by this */
/* encoding (see the note at the end of section 12 in the CFF */
/* specification). */
switch ( (FT_UInt)offset )
{
case 0:
/* First, copy the code to SID mapping. */
FT_ARRAY_COPY( encoding->sids, cff_standard_encoding, 256 );
goto Populate;
case 1:
/* First, copy the code to SID mapping. */
FT_ARRAY_COPY( encoding->sids, cff_expert_encoding, 256 );
Populate:
/* Construct code to GID mapping from code to SID mapping */
/* and charset. */
encoding->count = 0;
for ( j = 0; j < 256; j++ )
{
/* If j is encoded, find the GID for it. */
if ( encoding->sids[j] )
{
for ( i = 1; i < num_glyphs; i++ )
/* We matched, so break. */
if ( charset->sids[i] == encoding->sids[j] )
break;
/* i will be equal to num_glyphs if we exited the above */
/* loop without a match. In this case, we also have to */
/* fix the code to SID mapping. */
if ( i == num_glyphs )
{
encoding->codes[j] = 0;
encoding->sids [j] = 0;
}
else
{
encoding->codes[j] = (FT_UShort)i;
/* update encoding count */
if ( encoding->count < j + 1 )
encoding->count = j + 1;
}
}
}
break;
default:
FT_ERROR(( "cff_encoding_load: invalid table format!\n" ));
error = CFF_Err_Invalid_File_Format;
goto Exit;
}
}
Exit:
/* Clean up if there was an error. */
return error;
}
static FT_Error
cff_subfont_load( CFF_SubFont font,
CFF_Index idx,
FT_UInt font_index,
FT_Stream stream,
FT_ULong base_offset )
{
FT_Error error;
CFF_ParserRec parser;
FT_Byte* dict;
FT_ULong dict_len;
CFF_FontRecDict top = &font->font_dict;
CFF_Private priv = &font->private_dict;
cff_parser_init( &parser, CFF_CODE_TOPDICT, &font->font_dict );
/* set defaults */
FT_MEM_ZERO( top, sizeof ( *top ) );
top->underline_position = -100L << 16;
top->underline_thickness = 50L << 16;
top->charstring_type = 2;
top->font_matrix.xx = 0x10000L;
top->font_matrix.yy = 0x10000L;
top->cid_count = 8720;
/* we use the implementation specific SID value 0xFFFF to indicate */
/* missing entries */
top->version = 0xFFFFU;
top->notice = 0xFFFFU;
top->copyright = 0xFFFFU;
top->full_name = 0xFFFFU;
top->family_name = 0xFFFFU;
top->weight = 0xFFFFU;
top->embedded_postscript = 0xFFFFU;
top->cid_registry = 0xFFFFU;
top->cid_ordering = 0xFFFFU;
top->cid_font_name = 0xFFFFU;
error = cff_index_access_element( idx, font_index, &dict, &dict_len ) ||
cff_parser_run( &parser, dict, dict + dict_len );
cff_index_forget_element( idx, &dict );
if ( error )
goto Exit;
/* if it is a CID font, we stop there */
if ( top->cid_registry != 0xFFFFU )
goto Exit;
/* parse the private dictionary, if any */
if ( top->private_offset && top->private_size )
{
/* set defaults */
FT_MEM_ZERO( priv, sizeof ( *priv ) );
priv->blue_shift = 7;
priv->blue_fuzz = 1;
priv->lenIV = -1;
priv->expansion_factor = (FT_Fixed)( 0.06 * 0x10000L );
priv->blue_scale = (FT_Fixed)( 0.039625 * 0x10000L * 1000 );
cff_parser_init( &parser, CFF_CODE_PRIVATE, priv );
if ( FT_STREAM_SEEK( base_offset + font->font_dict.private_offset ) ||
FT_FRAME_ENTER( font->font_dict.private_size ) )
goto Exit;
error = cff_parser_run( &parser,
(FT_Byte*)stream->cursor,
(FT_Byte*)stream->limit );
FT_FRAME_EXIT();
if ( error )
goto Exit;
}
/* read the local subrs, if any */
if ( priv->local_subrs_offset )
{
if ( FT_STREAM_SEEK( base_offset + top->private_offset +
priv->local_subrs_offset ) )
goto Exit;
error = cff_new_index( &font->local_subrs_index, stream, 1 );
if ( error )
goto Exit;
font->num_local_subrs = font->local_subrs_index.count;
error = cff_index_get_pointers( &font->local_subrs_index,
&font->local_subrs );
if ( error )
goto Exit;
}
Exit:
return error;
}
static void
cff_subfont_done( FT_Memory memory,
CFF_SubFont subfont )
{
if ( subfont )
{
cff_done_index( &subfont->local_subrs_index );
FT_FREE( subfont->local_subrs );
}
}
FT_LOCAL_DEF( FT_Error )
cff_font_load( FT_Stream stream,
FT_Int face_index,
CFF_Font font )
{
static const FT_Frame_Field cff_header_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE CFF_FontRec
FT_FRAME_START( 4 ),
FT_FRAME_BYTE( version_major ),
FT_FRAME_BYTE( version_minor ),
FT_FRAME_BYTE( header_size ),
FT_FRAME_BYTE( absolute_offsize ),
FT_FRAME_END
};
FT_Error error;
FT_Memory memory = stream->memory;
FT_ULong base_offset;
CFF_FontRecDict dict;
FT_ZERO( font );
font->stream = stream;
font->memory = memory;
dict = &font->top_font.font_dict;
base_offset = FT_STREAM_POS();
/* read CFF font header */
if ( FT_STREAM_READ_FIELDS( cff_header_fields, font ) )
goto Exit;
/* check format */
if ( font->version_major != 1 ||
font->header_size < 4 ||
font->absolute_offsize > 4 )
{
FT_TRACE2(( "[not a CFF font header!]\n" ));
error = CFF_Err_Unknown_File_Format;
goto Exit;
}
/* skip the rest of the header */
if ( FT_STREAM_SKIP( font->header_size - 4 ) )
goto Exit;
/* read the name, top dict, string and global subrs index */
if ( FT_SET_ERROR( cff_new_index( &font->name_index, stream, 0 )) ||
FT_SET_ERROR( cff_new_index( &font->font_dict_index, stream, 0 )) ||
FT_SET_ERROR( cff_new_index( &font->string_index, stream, 0 )) ||
FT_SET_ERROR( cff_new_index( &font->global_subrs_index, stream, 1 )) )
goto Exit;
/* well, we don't really forget the `disabled' fonts... */
font->num_faces = font->name_index.count;
if ( face_index >= (FT_Int)font->num_faces )
{
FT_ERROR(( "cff_font_load: incorrect face index = %d\n",
face_index ));
error = CFF_Err_Invalid_Argument;
}
/* in case of a font format check, simply exit now */
if ( face_index < 0 )
goto Exit;
/* now, parse the top-level font dictionary */
error = cff_subfont_load( &font->top_font,
&font->font_dict_index,
face_index,
stream,
base_offset );
if ( error )
goto Exit;
if ( FT_STREAM_SEEK( base_offset + dict->charstrings_offset ) )
goto Exit;
error = cff_new_index( &font->charstrings_index, stream, 0 );
if ( error )
goto Exit;
/* now, check for a CID font */
if ( dict->cid_registry != 0xFFFFU )
{
CFF_IndexRec fd_index;
CFF_SubFont sub;
FT_UInt idx;
/* this is a CID-keyed font, we must now allocate a table of */
/* sub-fonts, then load each of them separately */
if ( FT_STREAM_SEEK( base_offset + dict->cid_fd_array_offset ) )
goto Exit;
error = cff_new_index( &fd_index, stream, 0 );
if ( error )
goto Exit;
if ( fd_index.count > CFF_MAX_CID_FONTS )
{
FT_ERROR(( "cff_font_load: FD array too large in CID font\n" ));
goto Fail_CID;
}
/* allocate & read each font dict independently */
font->num_subfonts = fd_index.count;
if ( FT_NEW_ARRAY( sub, fd_index.count ) )
goto Fail_CID;
/* setup pointer table */
for ( idx = 0; idx < fd_index.count; idx++ )
font->subfonts[idx] = sub + idx;
/* now load each sub font independently */
for ( idx = 0; idx < fd_index.count; idx++ )
{
sub = font->subfonts[idx];
error = cff_subfont_load( sub, &fd_index, idx,
stream, base_offset );
if ( error )
goto Fail_CID;
}
/* now load the FD Select array */
error = CFF_Load_FD_Select( &font->fd_select,
font->charstrings_index.count,
stream,
base_offset + dict->cid_fd_select_offset );
Fail_CID:
cff_done_index( &fd_index );
if ( error )
goto Exit;
}
else
font->num_subfonts = 0;
/* read the charstrings index now */
if ( dict->charstrings_offset == 0 )
{
FT_ERROR(( "cff_font_load: no charstrings offset!\n" ));
error = CFF_Err_Unknown_File_Format;
goto Exit;
}
/* explicit the global subrs */
font->num_global_subrs = font->global_subrs_index.count;
font->num_glyphs = font->charstrings_index.count;
error = cff_index_get_pointers( &font->global_subrs_index,
&font->global_subrs ) ;
if ( error )
goto Exit;
/* read the Charset and Encoding tables if available */
if ( font->num_glyphs > 0 )
{
FT_Bool invert;
invert = dict->cid_registry != 0xFFFFU &&
font->charstrings_index.count != dict->cid_count;
error = cff_charset_load( &font->charset, font->num_glyphs, stream,
base_offset, dict->charset_offset, invert );
if ( error )
goto Exit;
/* CID-keyed CFFs don't have an encoding */
if ( dict->cid_registry == 0xFFFFU )
{
error = cff_encoding_load( &font->encoding,
&font->charset,
font->num_glyphs,
stream,
base_offset,
dict->encoding_offset );
if ( error )
goto Exit;
}
else
/* CID-keyed fonts only need CIDs */
FT_FREE( font->charset.sids );
}
/* get the font name (/CIDFontName for CID-keyed fonts, */
/* /FontName otherwise) */
font->font_name = cff_index_get_name( &font->name_index, face_index );
Exit:
return error;
}
FT_LOCAL_DEF( void )
cff_font_done( CFF_Font font )
{
FT_Memory memory = font->memory;
FT_UInt idx;
cff_done_index( &font->global_subrs_index );
cff_done_index( &font->string_index );
cff_done_index( &font->font_dict_index );
cff_done_index( &font->name_index );
cff_done_index( &font->charstrings_index );
/* release font dictionaries, but only if working with */
/* a CID keyed CFF font */
if ( font->num_subfonts > 0 )
{
for ( idx = 0; idx < font->num_subfonts; idx++ )
cff_subfont_done( memory, font->subfonts[idx] );
FT_FREE( font->subfonts );
}
cff_encoding_done( &font->encoding );
cff_charset_done( &font->charset, font->stream );
cff_subfont_done( memory, &font->top_font );
CFF_Done_FD_Select( &font->fd_select, font->stream );
FT_FREE( font->global_subrs );
FT_FREE( font->font_name );
}
/* END */
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