rgraves
/
freetype2
forked from minhngoc25a/freetype2
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
freetype2/src/cff/cffload.c

2545 lines
73 KiB
C
Raw Blame History

/***************************************************************************/
/* */
/* cffload.c */
/* */
/* OpenType and CFF data/program tables loader (body). */
/* */
/* Copyright 1996-2017 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_TRUETYPE_TAGS_H
#include FT_TYPE1_TABLES_H
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
#include FT_MULTIPLE_MASTERS_H
#include FT_SERVICE_MULTIPLE_MASTERS_H
#endif
#include "cffload.h"
#include "cffparse.h"
#include "cfferrs.h"
#define FT_FIXED_ONE ( (FT_Fixed)0x10000 )
#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 /* 1 */
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 an offset from the index's stream current position */
static FT_ULong
cff_index_read_offset( CFF_Index idx,
FT_Error *errorp )
{
FT_Error error;
FT_Stream stream = idx->stream;
FT_Byte tmp[4];
FT_ULong result = 0;
if ( !FT_STREAM_READ( tmp, idx->off_size ) )
{
FT_Int nn;
for ( nn = 0; nn < idx->off_size; nn++ )
result = ( result << 8 ) | tmp[nn];
}
*errorp = error;
return result;
}
static FT_Error
cff_index_init( CFF_Index idx,
FT_Stream stream,
FT_Bool load,
FT_Bool cff2 )
{
FT_Error error;
FT_Memory memory = stream->memory;
FT_UInt count;
FT_ZERO( idx );
idx->stream = stream;
idx->start = FT_STREAM_POS();
if ( cff2 )
{
if ( FT_READ_ULONG( count ) )
goto Exit;
idx->hdr_size = 5;
}
else
{
if ( FT_READ_USHORT( count ) )
goto Exit;
idx->hdr_size = 3;
}
if ( count > 0 )
{
FT_Byte offsize;
FT_ULong size;
/* 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;
if ( offsize < 1 || offsize > 4 )
{
error = FT_THROW( Invalid_Table );
goto Exit;
}
idx->count = count;
idx->off_size = offsize;
size = (FT_ULong)( count + 1 ) * offsize;
idx->data_offset = idx->start + idx->hdr_size + size;
if ( FT_STREAM_SKIP( size - offsize ) )
goto Exit;
size = cff_index_read_offset( idx, &error );
if ( error )
goto Exit;
if ( size == 0 )
{
error = FT_THROW( Invalid_Table );
goto Exit;
}
idx->data_size = --size;
if ( load )
{
/* load the data */
if ( FT_FRAME_EXTRACT( size, idx->bytes ) )
goto Exit;
}
else
{
/* skip the data */
if ( FT_STREAM_SKIP( size ) )
goto Exit;
}
}
Exit:
if ( error )
FT_FREE( idx->offsets );
return error;
}
static void
cff_index_done( 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_ZERO( idx );
}
}
static FT_Error
cff_index_load_offsets( CFF_Index idx )
{
FT_Error error = FT_Err_Ok;
FT_Stream stream = idx->stream;
FT_Memory memory = stream->memory;
if ( idx->count > 0 && !idx->offsets )
{
FT_Byte offsize = idx->off_size;
FT_ULong data_size;
FT_Byte* p;
FT_Byte* p_end;
FT_ULong* poff;
data_size = (FT_ULong)( idx->count + 1 ) * offsize;
if ( FT_NEW_ARRAY( idx->offsets, idx->count + 1 ) ||
FT_STREAM_SEEK( idx->start + idx->hdr_size ) ||
FT_FRAME_ENTER( data_size ) )
goto Exit;
poff = idx->offsets;
p = (FT_Byte*)stream->cursor;
p_end = p + data_size;
switch ( offsize )
{
case 1:
for ( ; p < p_end; p++, poff++ )
poff[0] = p[0];
break;
case 2:
for ( ; p < p_end; p += 2, poff++ )
poff[0] = FT_PEEK_USHORT( p );
break;
case 3:
for ( ; p < p_end; p += 3, poff++ )
poff[0] = FT_PEEK_UOFF3( p );
break;
default:
for ( ; p < p_end; p += 4, poff++ )
poff[0] = FT_PEEK_ULONG( p );
}
FT_FRAME_EXIT();
}
Exit:
if ( error )
FT_FREE( idx->offsets );
return error;
}
/* Allocate a table containing pointers to an index's elements. */
/* The `pool' argument makes this function convert the index */
/* entries to C-style strings (this is, NULL-terminated). */
static FT_Error
cff_index_get_pointers( CFF_Index idx,
FT_Byte*** table,
FT_Byte** pool,
FT_ULong* pool_size )
{
FT_Error error = FT_Err_Ok;
FT_Memory memory = idx->stream->memory;
FT_Byte** t = NULL;
FT_Byte* new_bytes = NULL;
FT_ULong new_size;
*table = NULL;
if ( !idx->offsets )
{
error = cff_index_load_offsets( idx );
if ( error )
goto Exit;
}
new_size = idx->data_size + idx->count;
if ( idx->count > 0 &&
!FT_NEW_ARRAY( t, idx->count + 1 ) &&
( !pool || !FT_ALLOC( new_bytes, new_size ) ) )
{
FT_ULong n, cur_offset;
FT_ULong extra = 0;
FT_Byte* org_bytes = idx->bytes;
/* at this point, `idx->offsets' can't be NULL */
cur_offset = idx->offsets[0] - 1;
/* sanity check */
if ( cur_offset != 0 )
{
FT_TRACE0(( "cff_index_get_pointers:"
" invalid first offset value %d set to zero\n",
cur_offset ));
cur_offset = 0;
}
if ( !pool )
t[0] = org_bytes + cur_offset;
else
t[0] = new_bytes + cur_offset;
for ( n = 1; n <= idx->count; n++ )
{
FT_ULong next_offset = idx->offsets[n] - 1;
/* two sanity checks for invalid offset tables */
if ( next_offset < cur_offset )
next_offset = cur_offset;
else if ( next_offset > idx->data_size )
next_offset = idx->data_size;
if ( !pool )
t[n] = org_bytes + next_offset;
else
{
t[n] = new_bytes + next_offset + extra;
if ( next_offset != cur_offset )
{
FT_MEM_COPY( t[n - 1], org_bytes + cur_offset, t[n] - t[n - 1] );
t[n][0] = '\0';
t[n] += 1;
extra++;
}
}
cur_offset = next_offset;
}
*table = t;
if ( pool )
*pool = new_bytes;
if ( pool_size )
*pool_size = new_size;
}
Exit:
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 = FT_Err_Ok;
if ( idx && idx->count > element )
{
/* compute start and end offsets */
FT_Stream stream = idx->stream;
FT_ULong off1, off2 = 0;
/* load offsets from file or the offset table */
if ( !idx->offsets )
{
FT_ULong pos = element * idx->off_size;
if ( FT_STREAM_SEEK( idx->start + idx->hdr_size + pos ) )
goto Exit;
off1 = cff_index_read_offset( idx, &error );
if ( error )
goto Exit;
if ( off1 != 0 )
{
do
{
element++;
off2 = cff_index_read_offset( idx, &error );
} while ( off2 == 0 && element < idx->count );
}
}
else /* use offsets table */
{
off1 = idx->offsets[element];
if ( off1 )
{
do
{
element++;
off2 = idx->offsets[element];
} while ( off2 == 0 && element < idx->count );
}
}
/* XXX: should check off2 does not exceed the end of this entry; */
/* at present, only truncate off2 at the end of this stream */
if ( off2 > stream->size + 1 ||
idx->data_offset > stream->size - off2 + 1 )
{
FT_ERROR(( "cff_index_access_element:"
" offset to next entry (%d)"
" exceeds the end of stream (%d)\n",
off2, stream->size - idx->data_offset + 1 ));
off2 = stream->size - idx->data_offset + 1;
}
/* access element */
if ( off1 && off2 > 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 */
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 = FT_THROW( 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 );
}
}
/* get an entry from Name INDEX */
FT_LOCAL_DEF( FT_String* )
cff_index_get_name( CFF_Font font,
FT_UInt element )
{
CFF_Index idx = &font->name_index;
FT_Memory memory;
FT_Byte* bytes;
FT_ULong byte_len;
FT_Error error;
FT_String* name = 0;
if ( !idx->stream ) /* CFF2 does not include a name index */
goto Exit;
memory = idx->stream->memory;
error = cff_index_access_element( idx, element, &bytes, &byte_len );
if ( error )
goto Exit;
if ( !FT_ALLOC( name, byte_len + 1 ) )
{
if ( byte_len )
FT_MEM_COPY( name, bytes, byte_len );
name[byte_len] = 0;
}
cff_index_forget_element( idx, &bytes );
Exit:
return name;
}
/* get an entry from String INDEX */
FT_LOCAL_DEF( FT_String* )
cff_index_get_string( CFF_Font font,
FT_UInt element )
{
return ( element < font->num_strings )
? (FT_String*)font->strings[element]
: NULL;
}
FT_LOCAL_DEF( FT_String* )
cff_index_get_sid_string( CFF_Font font,
FT_UInt sid )
{
/* value 0xFFFFU indicates a missing dictionary entry */
if ( sid == 0xFFFFU )
return NULL;
/* if it is not a standard string, return it */
if ( sid > 390 )
return cff_index_get_string( font, sid - 391 );
/* CID-keyed CFF fonts don't have glyph names */
if ( !font->psnames )
return NULL;
/* this is a standard string */
return (FT_String *)font->psnames->adobe_std_strings( sid );
}
/*************************************************************************/
/*************************************************************************/
/*** ***/
/*** 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;
if ( !num_ranges )
{
FT_TRACE0(( "CFF_Load_FD_Select: empty FDSelect array\n" ));
error = FT_THROW( Invalid_File_Format );
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 = FT_THROW( 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;
/* if there is no FDSelect, return zero */
/* Note: CFF2 with just one Font Dict has no FDSelect */
if ( !fdselect->data )
goto Exit;
switch ( fdselect->format )
{
case 0:
fd = fdselect->data[glyph_index];
break;
case 3:
/* first, compare to the cache */
if ( (FT_UInt)( glyph_index - fdselect->cache_first ) <
fdselect->cache_count )
{
fd = fdselect->cache_fd;
break;
}
/* then, look up 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:
;
}
Exit:
return fd;
}
/*************************************************************************/
/*************************************************************************/
/*** ***/
/*** CFF font support ***/
/*** ***/
/*************************************************************************/
/*************************************************************************/
static FT_Error
cff_charset_compute_cids( CFF_Charset charset,
FT_UInt num_glyphs,
FT_Memory memory )
{
FT_Error error = FT_Err_Ok;
FT_UInt i;
FT_Long j;
FT_UShort max_cid = 0;
if ( charset->max_cid > 0 )
goto Exit;
for ( i = 0; i < num_glyphs; i++ )
{
if ( charset->sids[i] > max_cid )
max_cid = charset->sids[i];
}
if ( FT_NEW_ARRAY( charset->cids, (FT_ULong)max_cid + 1 ) )
goto Exit;
/* When multiple GIDs map to the same CID, we choose the lowest */
/* GID. This is not described in any spec, but it matches the */
/* behaviour of recent Acroread versions. */
for ( j = (FT_Long)num_glyphs - 1; j >= 0; j-- )
charset->cids[charset->sids[j]] = (FT_UShort)j;
charset->max_cid = max_cid;
charset->num_glyphs = num_glyphs;
Exit:
return error;
}
FT_LOCAL_DEF( FT_UInt )
cff_charset_cid_to_gindex( CFF_Charset charset,
FT_UInt cid )
{
FT_UInt result = 0;
if ( cid <= charset->max_cid )
result = charset->cids[cid];
return result;
}
static void
cff_charset_free_cids( CFF_Charset charset,
FT_Memory memory )
{
FT_FREE( charset->cids );
charset->max_cid = 0;
}
static void
cff_charset_done( CFF_Charset charset,
FT_Stream stream )
{
FT_Memory memory = stream->memory;
cff_charset_free_cids( charset, memory );
FT_FREE( charset->sids );
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 = FT_Err_Ok;
FT_UShort glyph_sid;
/* If 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;
}
/* try to rescue some of the SIDs if `nleft' is too large */
if ( glyph_sid > 0xFFFFL - nleft )
{
FT_ERROR(( "cff_charset_load: invalid SID range trimmed"
" nleft=%d -> %d\n", nleft, 0xFFFFL - glyph_sid ));
nleft = ( FT_UInt )( 0xFFFFL - glyph_sid );
}
/* 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 = FT_THROW( 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 = FT_THROW( 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 = FT_THROW( 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 = FT_THROW( 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 = FT_THROW( Invalid_File_Format );
goto Exit;
}
}
/* we have to invert the `sids' array for subsetted CID-keyed fonts */
if ( invert )
error = cff_charset_compute_cids( charset, num_glyphs, memory );
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_vstore_done( CFF_VStoreRec* vstore,
FT_Memory memory )
{
FT_UInt i;
/* free regionList and axisLists */
if ( vstore->varRegionList )
{
for ( i = 0; i < vstore->regionCount; i++ )
FT_FREE( vstore->varRegionList[i].axisList );
}
FT_FREE( vstore->varRegionList );
/* free varData and indices */
if ( vstore->varData )
{
for ( i = 0; i < vstore->dataCount; i++ )
FT_FREE( vstore->varData[i].regionIndices );
}
FT_FREE( vstore->varData );
}
/* convert 2.14 to Fixed */
#define FT_fdot14ToFixed( x ) ( (FT_Fixed)( (FT_ULong)(x) << 2 ) )
static FT_Error
cff_vstore_load( CFF_VStoreRec* vstore,
FT_Stream stream,
FT_ULong base_offset,
FT_ULong offset )
{
FT_Memory memory = stream->memory;
FT_Error error = FT_ERR( Invalid_File_Format );
FT_ULong* dataOffsetArray = NULL;
FT_UInt i, j;
/* no offset means no vstore to parse */
if ( offset )
{
FT_UInt vsOffset;
FT_UInt format;
FT_ULong regionListOffset;
/* we need to parse the table to determine its size; */
/* skip table length */
if ( FT_STREAM_SEEK( base_offset + offset ) ||
FT_STREAM_SKIP( 2 ) )
goto Exit;
/* actual variation store begins after the length */
vsOffset = FT_STREAM_POS();
/* check the header */
if ( FT_READ_USHORT( format ) )
goto Exit;
if ( format != 1 )
{
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
/* read top level fields */
if ( FT_READ_ULONG( regionListOffset ) ||
FT_READ_USHORT( vstore->dataCount ) )
goto Exit;
/* make temporary copy of item variation data offsets; */
/* we'll parse region list first, then come back */
if ( FT_NEW_ARRAY( dataOffsetArray, vstore->dataCount ) )
goto Exit;
for ( i = 0; i < vstore->dataCount; i++ )
{
if ( FT_READ_ULONG( dataOffsetArray[i] ) )
goto Exit;
}
/* parse regionList and axisLists */
if ( FT_STREAM_SEEK( vsOffset + regionListOffset ) ||
FT_READ_USHORT( vstore->axisCount ) ||
FT_READ_USHORT( vstore->regionCount ) )
goto Exit;
if ( FT_NEW_ARRAY( vstore->varRegionList, vstore->regionCount ) )
goto Exit;
for ( i = 0; i < vstore->regionCount; i++ )
{
CFF_VarRegion* region = &vstore->varRegionList[i];
if ( FT_NEW_ARRAY( region->axisList, vstore->axisCount ) )
goto Exit;
for ( j = 0; j < vstore->axisCount; j++ )
{
CFF_AxisCoords* axis = &region->axisList[j];
FT_Int16 start14, peak14, end14;
if ( FT_READ_SHORT( start14 ) ||
FT_READ_SHORT( peak14 ) ||
FT_READ_SHORT( end14 ) )
goto Exit;
axis->startCoord = FT_fdot14ToFixed( start14 );
axis->peakCoord = FT_fdot14ToFixed( peak14 );
axis->endCoord = FT_fdot14ToFixed( end14 );
}
}
/* use dataOffsetArray now to parse varData items */
if ( FT_NEW_ARRAY( vstore->varData, vstore->dataCount ) )
goto Exit;
for ( i = 0; i < vstore->dataCount; i++ )
{
CFF_VarData* data = &vstore->varData[i];
if ( FT_STREAM_SEEK( vsOffset + dataOffsetArray[i] ) )
goto Exit;
/* ignore `itemCount' and `shortDeltaCount' */
/* because CFF2 has no delta sets */
if ( FT_STREAM_SKIP( 4 ) )
goto Exit;
/* Note: just record values; consistency is checked later */
/* by cff_blend_build_vector when it consumes `vstore' */
if ( FT_READ_USHORT( data->regionIdxCount ) )
goto Exit;
if ( FT_NEW_ARRAY( data->regionIndices, data->regionIdxCount ) )
goto Exit;
for ( j = 0; j < data->regionIdxCount; j++ )
{
if ( FT_READ_USHORT( data->regionIndices[j] ) )
goto Exit;
}
}
}
error = FT_Err_Ok;
Exit:
FT_FREE( dataOffsetArray );
if ( error )
cff_vstore_done( vstore, memory );
return error;
}
/* Clear blend stack (after blend values are consumed). */
/* */
/* TODO: Should do this in cff_run_parse, but subFont */
/* ref is not available there. */
/* */
/* Allocation is not changed when stack is cleared. */
FT_LOCAL_DEF( void )
cff_blend_clear( CFF_SubFont subFont )
{
subFont->blend_top = subFont->blend_stack;
subFont->blend_used = 0;
}
/* Blend numOperands on the stack, */
/* store results into the first numBlends values, */
/* then pop remaining arguments. */
/* */
/* This is comparable to `cf2_doBlend' but */
/* the cffparse stack is different and can't be written. */
/* Blended values are written to a different buffer, */
/* using reserved operator 255. */
/* */
/* Blend calculation is done in 16.16 fixed point. */
FT_LOCAL_DEF( FT_Error )
cff_blend_doBlend( CFF_SubFont subFont,
CFF_Parser parser,
FT_UInt numBlends )
{
FT_UInt delta;
FT_UInt base;
FT_UInt i, j;
FT_UInt size;
CFF_Blend blend = &subFont->blend;
FT_Memory memory = subFont->blend.font->memory; /* for FT_REALLOC */
FT_Error error = FT_Err_Ok; /* for FT_REALLOC */
/* compute expected number of operands for this blend */
FT_UInt numOperands = (FT_UInt)( numBlends * blend->lenBV );
FT_UInt count = (FT_UInt)( parser->top - 1 - parser->stack );
if ( numOperands > count )
{
FT_TRACE4(( " cff_blend_doBlend: Stack underflow %d args\n", count ));
error = FT_THROW( Stack_Underflow );
goto Exit;
}
/* check whether we have room for `numBlends' values at `blend_top' */
size = 5 * numBlends; /* add 5 bytes per entry */
if ( subFont->blend_used + size > subFont->blend_alloc )
{
FT_Byte* blend_stack_old = subFont->blend_stack;
FT_Byte* blend_top_old = subFont->blend_top;
/* increase or allocate `blend_stack' and reset `blend_top'; */
/* prepare to append `numBlends' values to the buffer */
if ( FT_REALLOC( subFont->blend_stack,
subFont->blend_alloc,
subFont->blend_alloc + size ) )
goto Exit;
subFont->blend_top = subFont->blend_stack + subFont->blend_used;
subFont->blend_alloc += size;
/* iterate over the parser stack and adjust pointers */
/* if the reallocated buffer has a different address */
if ( blend_stack_old &&
subFont->blend_stack != blend_stack_old )
{
FT_PtrDist offset = subFont->blend_stack - blend_stack_old;
FT_Byte** p;
for ( p = parser->stack; p < parser->top; p++ )
{
if ( *p >= blend_stack_old && *p < blend_top_old )
*p += offset;
}
}
}
subFont->blend_used += size;
base = count - numOperands; /* index of first blend arg */
delta = base + numBlends; /* index of first delta arg */
for ( i = 0; i < numBlends; i++ )
{
const FT_Int32* weight = &blend->BV[1];
FT_Int32 sum;
/* convert inputs to 16.16 fixed point */
sum = cff_parse_num( parser, &parser->stack[i + base] ) * 65536;
for ( j = 1; j < blend->lenBV; j++ )
sum = ADD_INT32(
sum,
FT_MulFix(
*weight++,
cff_parse_num( parser,
&parser->stack[delta++] ) * 65536 ) );
/* point parser stack to new value on blend_stack */
parser->stack[i + base] = subFont->blend_top;
/* Push blended result as Type 2 5-byte fixed point number. This */
/* will not conflict with actual DICTs because 255 is a reserved */
/* opcode in both CFF and CFF2 DICTs. See `cff_parse_num' for */
/* decode of this, which rounds to an integer. */
*subFont->blend_top++ = 255;
*subFont->blend_top++ = ( (FT_UInt32)sum & 0xFF000000U ) >> 24;
*subFont->blend_top++ = ( (FT_UInt32)sum & 0x00FF0000U ) >> 16;
*subFont->blend_top++ = ( (FT_UInt32)sum & 0x0000FF00U ) >> 8;
*subFont->blend_top++ = (FT_UInt32)sum & 0x000000FFU;
}
/* leave only numBlends results on parser stack */
parser->top = &parser->stack[base + numBlends];
Exit:
return error;
}
/* Compute a blend vector from variation store index and normalized */
/* vector based on pseudo-code in OpenType Font Variations Overview. */
/* */
/* Note: lenNDV == 0 produces a default blend vector, (1,0,0,...). */
FT_LOCAL_DEF( FT_Error )
cff_blend_build_vector( CFF_Blend blend,
FT_UInt vsindex,
FT_UInt lenNDV,
FT_Fixed* NDV )
{
FT_Error error = FT_Err_Ok; /* for FT_REALLOC */
FT_Memory memory = blend->font->memory; /* for FT_REALLOC */
FT_UInt len;
CFF_VStore vs;
CFF_VarData* varData;
FT_UInt master;
FT_ASSERT( lenNDV == 0 || NDV );
blend->builtBV = FALSE;
vs = &blend->font->vstore;
/* VStore and fvar must be consistent */
if ( lenNDV != 0 && lenNDV != vs->axisCount )
{
FT_TRACE4(( " cff_blend_build_vector: Axis count mismatch\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
if ( vsindex >= vs->dataCount )
{
FT_TRACE4(( " cff_blend_build_vector: vsindex out of range\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
/* select the item variation data structure */
varData = &vs->varData[vsindex];
/* prepare buffer for the blend vector */
len = varData->regionIdxCount + 1; /* add 1 for default component */
if ( FT_REALLOC( blend->BV,
blend->lenBV * sizeof( *blend->BV ),
len * sizeof( *blend->BV ) ) )
goto Exit;
blend->lenBV = len;
/* outer loop steps through master designs to be blended */
for ( master = 0; master < len; master++ )
{
FT_UInt j;
FT_UInt idx;
CFF_VarRegion* varRegion;
/* default factor is always one */
if ( master == 0 )
{
blend->BV[master] = FT_FIXED_ONE;
FT_TRACE4(( " build blend vector len %d\n"
" [ %f ",
len,
blend->BV[master] / 65536.0 ));
continue;
}
/* VStore array does not include default master, so subtract one */
idx = varData->regionIndices[master - 1];
varRegion = &vs->varRegionList[idx];
if ( idx >= vs->regionCount )
{
FT_TRACE4(( " cff_blend_build_vector:"
" region index out of range\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
/* Note: `lenNDV' could be zero. */
/* In that case, build default blend vector (1,0,0...). */
if ( !lenNDV )
{
blend->BV[master] = 0;
continue;
}
/* In the normal case, initialize each component to 1 */
/* before inner loop. */
blend->BV[master] = FT_FIXED_ONE; /* default */
/* inner loop steps through axes in this region */
for ( j = 0; j < lenNDV; j++ )
{
CFF_AxisCoords* axis = &varRegion->axisList[j];
FT_Fixed axisScalar;
/* compute the scalar contribution of this axis; */
/* ignore invalid ranges */
if ( axis->startCoord > axis->peakCoord ||
axis->peakCoord > axis->endCoord )
axisScalar = FT_FIXED_ONE;
else if ( axis->startCoord < 0 &&
axis->endCoord > 0 &&
axis->peakCoord != 0 )
axisScalar = FT_FIXED_ONE;
/* peak of 0 means ignore this axis */
else if ( axis->peakCoord == 0 )
axisScalar = FT_FIXED_ONE;
/* ignore this region if coords are out of range */
else if ( NDV[j] < axis->startCoord ||
NDV[j] > axis->endCoord )
axisScalar = 0;
/* calculate a proportional factor */
else
{
if ( NDV[j] == axis->peakCoord )
axisScalar = FT_FIXED_ONE;
else if ( NDV[j] < axis->peakCoord )
axisScalar = FT_DivFix( NDV[j] - axis->startCoord,
axis->peakCoord - axis->startCoord );
else
axisScalar = FT_DivFix( axis->endCoord - NDV[j],
axis->endCoord - axis->peakCoord );
}
/* take product of all the axis scalars */
blend->BV[master] = FT_MulFix( blend->BV[master], axisScalar );
}
FT_TRACE4(( ", %f ",
blend->BV[master] / 65536.0 ));
}
FT_TRACE4(( "]\n" ));
/* record the parameters used to build the blend vector */
blend->lastVsindex = vsindex;
if ( lenNDV != 0 )
{
/* user has set a normalized vector */
if ( FT_REALLOC( blend->lastNDV,
blend->lenNDV * sizeof ( *NDV ),
lenNDV * sizeof ( *NDV ) ) )
goto Exit;
FT_MEM_COPY( blend->lastNDV,
NDV,
lenNDV * sizeof ( *NDV ) );
}
blend->lenNDV = lenNDV;
blend->builtBV = TRUE;
Exit:
return error;
}
/* `lenNDV' is zero for default vector; */
/* return TRUE if blend vector needs to be built. */
FT_LOCAL_DEF( FT_Bool )
cff_blend_check_vector( CFF_Blend blend,
FT_UInt vsindex,
FT_UInt lenNDV,
FT_Fixed* NDV )
{
if ( !blend->builtBV ||
blend->lastVsindex != vsindex ||
blend->lenNDV != lenNDV ||
( lenNDV &&
memcmp( NDV,
blend->lastNDV,
lenNDV * sizeof ( *NDV ) ) != 0 ) )
{
/* need to build blend vector */
return TRUE;
}
return FALSE;
}
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
FT_LOCAL_DEF( FT_Error )
cff_get_var_blend( CFF_Face face,
FT_UInt *num_coords,
FT_Fixed* *coords,
FT_Fixed* *normalizedcoords,
FT_MM_Var* *mm_var )
{
FT_Service_MultiMasters mm = (FT_Service_MultiMasters)face->mm;
return mm->get_var_blend( FT_FACE( face ),
num_coords,
coords,
normalizedcoords,
mm_var );
}
FT_LOCAL_DEF( void )
cff_done_blend( CFF_Face face )
{
FT_Service_MultiMasters mm = (FT_Service_MultiMasters)face->mm;
mm->done_blend( FT_FACE( face ) );
}
#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
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 = FT_Err_Ok;
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 = FT_THROW( 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 = FT_THROW( 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
{
/* 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;
error = cff_charset_compute_cids( charset, num_glyphs,
stream->memory );
if ( error )
goto Exit;
for ( j = 0; j < 256; j++ )
{
FT_UInt sid = encoding->sids[j];
FT_UInt gid = 0;
if ( sid )
gid = cff_charset_cid_to_gindex( charset, sid );
if ( gid != 0 )
{
encoding->codes[j] = (FT_UShort)gid;
encoding->count = j + 1;
}
else
{
encoding->codes[j] = 0;
encoding->sids [j] = 0;
}
}
break;
default:
FT_ERROR(( "cff_encoding_load: invalid table format\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
}
Exit:
/* Clean up if there was an error. */
return error;
}
/* Parse private dictionary; first call is always from `cff_face_init', */
/* so NDV has not been set for CFF2 variation. */
/* */
/* `cff_slot_load' must call this function each time NDV changes. */
FT_LOCAL_DEF( FT_Error )
cff_load_private_dict( CFF_Font font,
CFF_SubFont subfont,
FT_UInt lenNDV,
FT_Fixed* NDV )
{
FT_Error error = FT_Err_Ok;
CFF_ParserRec parser;
CFF_FontRecDict top = &subfont->font_dict;
CFF_Private priv = &subfont->private_dict;
FT_Stream stream = font->stream;
FT_UInt stackSize;
/* store handle needed to access memory, vstore for blend; */
/* we need this for clean-up even if there is no private DICT */
subfont->blend.font = font;
subfont->blend.usedBV = FALSE; /* clear state */
if ( !top->private_offset || !top->private_size )
goto Exit2; /* no private DICT, do nothing */
/* set defaults */
FT_ZERO( 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 );
/* provide inputs for blend calculations */
priv->subfont = subfont;
subfont->lenNDV = lenNDV;
subfont->NDV = NDV;
/* add 1 for the operator */
stackSize = font->cff2 ? font->top_font.font_dict.maxstack + 1
: CFF_MAX_STACK_DEPTH + 1;
if ( cff_parser_init( &parser,
font->cff2 ? CFF2_CODE_PRIVATE : CFF_CODE_PRIVATE,
priv,
font->library,
stackSize,
top->num_designs,
top->num_axes ) )
goto Exit;
if ( FT_STREAM_SEEK( font->base_offset + top->private_offset ) ||
FT_FRAME_ENTER( top->private_size ) )
goto Exit;
FT_TRACE4(( " private dictionary:\n" ));
error = cff_parser_run( &parser,
(FT_Byte*)stream->cursor,
(FT_Byte*)stream->limit );
FT_FRAME_EXIT();
if ( error )
goto Exit;
/* ensure that `num_blue_values' is even */
priv->num_blue_values &= ~1;
/* sanitize `initialRandomSeed' to be a positive value, if necessary; */
/* this is not mandated by the specification but by our implementation */
if ( priv->initial_random_seed < 0 )
priv->initial_random_seed = -priv->initial_random_seed;
else if ( priv->initial_random_seed == 0 )
priv->initial_random_seed = 987654321;
Exit:
/* clean up */
cff_blend_clear( subfont ); /* clear blend stack */
cff_parser_done( &parser ); /* free parser stack */
Exit2:
/* no clean up (parser not initialized) */
return error;
}
/* There are 3 ways to call this function, distinguished by code. */
/* */
/* . CFF_CODE_TOPDICT for either a CFF Top DICT or a CFF Font DICT */
/* . CFF2_CODE_TOPDICT for CFF2 Top DICT */
/* . CFF2_CODE_FONTDICT for CFF2 Font DICT */
static FT_Error
cff_subfont_load( CFF_SubFont subfont,
CFF_Index idx,
FT_UInt font_index,
FT_Stream stream,
FT_ULong base_offset,
FT_UInt code,
CFF_Font font,
CFF_Face face )
{
FT_Error error;
CFF_ParserRec parser;
FT_Byte* dict = NULL;
FT_ULong dict_len;
CFF_FontRecDict top = &subfont->font_dict;
CFF_Private priv = &subfont->private_dict;
PSAux_Service psaux = (PSAux_Service)face->psaux;
FT_Bool cff2 = FT_BOOL( code == CFF2_CODE_TOPDICT ||
code == CFF2_CODE_FONTDICT );
FT_UInt stackSize = cff2 ? CFF2_DEFAULT_STACK
: CFF_MAX_STACK_DEPTH;
/* Note: We use default stack size for CFF2 Font DICT because */
/* Top and Font DICTs are not allowed to have blend operators. */
error = cff_parser_init( &parser,
code,
&subfont->font_dict,
font->library,
stackSize,
0,
0 );
if ( error )
goto Exit;
/* set defaults */
FT_ZERO( 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;
/* set default stack size */
top->maxstack = cff2 ? CFF2_DEFAULT_STACK : 48;
if ( idx->count ) /* count is nonzero for a real index */
error = cff_index_access_element( idx, font_index, &dict, &dict_len );
else
{
/* CFF2 has a fake top dict index; */
/* simulate `cff_index_access_element' */
/* Note: macros implicitly use `stream' and set `error' */
if ( FT_STREAM_SEEK( idx->data_offset ) ||
FT_FRAME_EXTRACT( idx->data_size, dict ) )
goto Exit;
dict_len = idx->data_size;
}
if ( !error )
{
FT_TRACE4(( " top dictionary:\n" ));
error = cff_parser_run( &parser, dict, dict + dict_len );
}
/* clean up regardless of error */
if ( idx->count )
cff_index_forget_element( idx, &dict );
else
FT_FRAME_RELEASE( 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. */
/* */
/* CFF2 does not have a private dictionary in the Top DICT */
/* but may have one in a Font DICT. We need to parse */
/* the latter here in order to load any local subrs. */
error = cff_load_private_dict( font, subfont, 0, 0 );
if ( error )
goto Exit;
if ( !cff2 )
{
/*
* Initialize the random number generator.
*
* . If we have a face-specific seed, use it.
* If non-zero, update it to a positive value.
*
* . Otherwise, use the seed from the CFF driver.
* If non-zero, update it to a positive value.
*
* . If the random value is zero, use the seed given by the subfont's
* `initialRandomSeed' value.
*
*/
if ( face->root.internal->random_seed == -1 )
{
CFF_Driver driver = (CFF_Driver)FT_FACE_DRIVER( face );
subfont->random = (FT_UInt32)driver->random_seed;
if ( driver->random_seed )
{
do
{
driver->random_seed =
(FT_Int32)psaux->cff_random( (FT_UInt32)driver->random_seed );
} while ( driver->random_seed < 0 );
}
}
else
{
subfont->random = (FT_UInt32)face->root.internal->random_seed;
if ( face->root.internal->random_seed )
{
do
{
face->root.internal->random_seed =
(FT_Int32)psaux->cff_random( (FT_UInt32)face->root.internal->random_seed );
} while ( face->root.internal->random_seed < 0 );
}
}
if ( !subfont->random )
subfont->random = (FT_UInt32)priv->initial_random_seed;
}
/* 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_index_init( &subfont->local_subrs_index, stream, 1, cff2 );
if ( error )
goto Exit;
error = cff_index_get_pointers( &subfont->local_subrs_index,
&subfont->local_subrs, NULL, NULL );
if ( error )
goto Exit;
}
Exit:
cff_parser_done( &parser ); /* free parser stack */
return error;
}
static void
cff_subfont_done( FT_Memory memory,
CFF_SubFont subfont )
{
if ( subfont )
{
cff_index_done( &subfont->local_subrs_index );
FT_FREE( subfont->local_subrs );
FT_FREE( subfont->blend.lastNDV );
FT_FREE( subfont->blend.BV );
FT_FREE( subfont->blend_stack );
}
}
FT_LOCAL_DEF( FT_Error )
cff_font_load( FT_Library library,
FT_Stream stream,
FT_Int face_index,
CFF_Font font,
CFF_Face face,
FT_Bool pure_cff,
FT_Bool cff2 )
{
static const FT_Frame_Field cff_header_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE CFF_FontRec
FT_FRAME_START( 3 ),
FT_FRAME_BYTE( version_major ),
FT_FRAME_BYTE( version_minor ),
FT_FRAME_BYTE( header_size ),
FT_FRAME_END
};
FT_Error error;
FT_Memory memory = stream->memory;
FT_ULong base_offset;
CFF_FontRecDict dict;
CFF_IndexRec string_index;
FT_UInt subfont_index;
FT_ZERO( font );
FT_ZERO( &string_index );
dict = &font->top_font.font_dict;
base_offset = FT_STREAM_POS();
font->library = library;
font->stream = stream;
font->memory = memory;
font->cff2 = cff2;
font->base_offset = base_offset;
/* read CFF font header */
if ( FT_STREAM_READ_FIELDS( cff_header_fields, font ) )
goto Exit;
if ( cff2 )
{
if ( font->version_major != 2 ||
font->header_size < 5 )
{
FT_TRACE2(( " not a CFF2 font header\n" ));
error = FT_THROW( Unknown_File_Format );
goto Exit;
}
if ( FT_READ_USHORT( font->top_dict_length ) )
goto Exit;
}
else
{
FT_Byte absolute_offset;
if ( FT_READ_BYTE( absolute_offset ) )
goto Exit;
if ( font->version_major != 1 ||
font->header_size < 4 ||
absolute_offset > 4 )
{
FT_TRACE2(( " not a CFF font header\n" ));
error = FT_THROW( Unknown_File_Format );
goto Exit;
}
}
/* skip the rest of the header */
if ( FT_STREAM_SEEK( base_offset + font->header_size ) )
{
/* For pure CFFs we have read only four bytes so far. Contrary to */
/* other formats like SFNT those bytes doesn't define a signature; */
/* it is thus possible that the font isn't a CFF at all. */
if ( pure_cff )
{
FT_TRACE2(( " not a CFF file\n" ));
error = FT_THROW( Unknown_File_Format );
}
goto Exit;
}
if ( cff2 )
{
/* For CFF2, the top dict data immediately follow the header */
/* and the length is stored in the header `offSize' field; */
/* there is no index for it. */
/* */
/* Use the `font_dict_index' to save the current position */
/* and length of data, but leave count at zero as an indicator. */
FT_ZERO( &font->font_dict_index );
font->font_dict_index.data_offset = FT_STREAM_POS();
font->font_dict_index.data_size = font->top_dict_length;
/* skip the top dict data for now, we will parse it later */
if ( FT_STREAM_SKIP( font->top_dict_length ) )
goto Exit;
/* next, read the global subrs index */
if ( FT_SET_ERROR( cff_index_init( &font->global_subrs_index,
stream, 1, cff2 ) ) )
goto Exit;
}
else
{
/* for CFF, read the name, top dict, string and global subrs index */
if ( FT_SET_ERROR( cff_index_init( &font->name_index,
stream, 0, cff2 ) ) )
{
if ( pure_cff )
{
FT_TRACE2(( " not a CFF file\n" ));
error = FT_THROW( Unknown_File_Format );
}
goto Exit;
}
/* if we have an empty font name, */
/* it must be the only font in the CFF */
if ( font->name_index.count > 1 &&
font->name_index.data_size < font->name_index.count )
{
/* for pure CFFs, we still haven't checked enough bytes */
/* to be sure that it is a CFF at all */
error = pure_cff ? FT_THROW( Unknown_File_Format )
: FT_THROW( Invalid_File_Format );
goto Exit;
}
if ( FT_SET_ERROR( cff_index_init( &font->font_dict_index,
stream, 0, cff2 ) ) ||
FT_SET_ERROR( cff_index_init( &string_index,
stream, 1, cff2 ) ) ||
FT_SET_ERROR( cff_index_init( &font->global_subrs_index,
stream, 1, cff2 ) ) ||
FT_SET_ERROR( cff_index_get_pointers( &string_index,
&font->strings,
&font->string_pool,
&font->string_pool_size ) ) )
goto Exit;
/* there must be a Top DICT index entry for each name index entry */
if ( font->name_index.count > font->font_dict_index.count )
{
FT_ERROR(( "cff_font_load:"
" not enough entries in Top DICT index\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
}
font->num_strings = string_index.count;
if ( pure_cff )
{
/* well, we don't really forget the `disabled' fonts... */
subfont_index = (FT_UInt)( face_index & 0xFFFF );
if ( face_index > 0 && subfont_index >= font->name_index.count )
{
FT_ERROR(( "cff_font_load:"
" invalid subfont index for pure CFF font (%d)\n",
subfont_index ));
error = FT_THROW( Invalid_Argument );
goto Exit;
}
font->num_faces = font->name_index.count;
}
else
{
subfont_index = 0;
if ( font->name_index.count > 1 )
{
FT_ERROR(( "cff_font_load:"
" invalid CFF font with multiple subfonts\n"
" "
" in SFNT wrapper\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
}
/* in case of a font format check, simply exit now */
if ( face_index < 0 )
goto Exit;
/* now, parse the top-level font dictionary */
FT_TRACE4(( "parsing top-level\n" ));
error = cff_subfont_load( &font->top_font,
&font->font_dict_index,
subfont_index,
stream,
base_offset,
cff2 ? CFF2_CODE_TOPDICT : CFF_CODE_TOPDICT,
font,
face );
if ( error )
goto Exit;
if ( FT_STREAM_SEEK( base_offset + dict->charstrings_offset ) )
goto Exit;
error = cff_index_init( &font->charstrings_index, stream, 0, cff2 );
if ( error )
goto Exit;
/* now, check for a CID or CFF2 font */
if ( dict->cid_registry != 0xFFFFU ||
cff2 )
{
CFF_IndexRec fd_index;
CFF_SubFont sub = NULL;
FT_UInt idx;
/* for CFF2, read the Variation Store if available; */
/* this must follow the Top DICT parse and precede any Private DICT */
error = cff_vstore_load( &font->vstore,
stream,
base_offset,
dict->vstore_offset );
if ( error )
goto Exit;
/* 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_index_init( &fd_index, stream, 0, cff2 );
if ( error )
goto Exit;
/* Font Dicts are not limited to 256 for CFF2. */
/* TODO: support this for CFF2 */
if ( fd_index.count > CFF_MAX_CID_FONTS )
{
FT_TRACE0(( "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;
/* set up pointer table */
for ( idx = 0; idx < fd_index.count; idx++ )
font->subfonts[idx] = sub + idx;
/* now load each subfont independently */
for ( idx = 0; idx < fd_index.count; idx++ )
{
sub = font->subfonts[idx];
FT_TRACE4(( "parsing subfont %u\n", idx ));
error = cff_subfont_load( sub,
&fd_index,
idx,
stream,
base_offset,
cff2 ? CFF2_CODE_FONTDICT
: CFF_CODE_TOPDICT,
font,
face );
if ( error )
goto Fail_CID;
}
/* now load the FD Select array; */
/* CFF2 omits FDSelect if there is only one FD */
if ( !cff2 || fd_index.count > 1 )
error = CFF_Load_FD_Select( &font->fd_select,
font->charstrings_index.count,
stream,
base_offset + dict->cid_fd_select_offset );
Fail_CID:
cff_index_done( &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 = FT_THROW( Invalid_File_Format );
goto Exit;
}
font->num_glyphs = font->charstrings_index.count;
error = cff_index_get_pointers( &font->global_subrs_index,
&font->global_subrs, NULL, NULL );
if ( error )
goto Exit;
/* read the Charset and Encoding tables if available */
if ( !cff2 && font->num_glyphs > 0 )
{
FT_Bool invert = FT_BOOL( dict->cid_registry != 0xFFFFU && pure_cff );
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;
}
}
/* get the font name (/CIDFontName for CID-keyed fonts, */
/* /FontName otherwise) */
font->font_name = cff_index_get_name( font, subfont_index );
Exit:
cff_index_done( &string_index );
return error;
}
FT_LOCAL_DEF( void )
cff_font_done( CFF_Font font )
{
FT_Memory memory = font->memory;
FT_UInt idx;
cff_index_done( &font->global_subrs_index );
cff_index_done( &font->font_dict_index );
cff_index_done( &font->name_index );
cff_index_done( &font->charstrings_index );
/* release font dictionaries, but only if working with */
/* a CID keyed CFF font or a CFF2 font */
if ( font->num_subfonts > 0 )
{
for ( idx = 0; idx < font->num_subfonts; idx++ )
cff_subfont_done( memory, font->subfonts[idx] );
/* the subfonts array has been allocated as a single block */
FT_FREE( font->subfonts[0] );
}
cff_encoding_done( &font->encoding );
cff_charset_done( &font->charset, font->stream );
cff_vstore_done( &font->vstore, memory );
cff_subfont_done( memory, &font->top_font );
CFF_Done_FD_Select( &font->fd_select, font->stream );
FT_FREE( font->font_info );
FT_FREE( font->font_name );
FT_FREE( font->global_subrs );
FT_FREE( font->strings );
FT_FREE( font->string_pool );
if ( font->cf2_instance.finalizer )
{
font->cf2_instance.finalizer( font->cf2_instance.data );
FT_FREE( font->cf2_instance.data );
}
}
/* END */
Reference in New Issue View Git Blame Copy Permalink