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kc3-lang/freetype/src/cff/cffload.c
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Author :
John Tytgat
Date : 2013-08-06 08:55:19
Hash : 9bcfab87
Message : Fix Savannah bug #39702. * src/cff/cffload.c (cff_index_get_pointers): Check for `cur_offset != 0'; this stronger test is mandated by the CFF specification. Fix test for INDEX structures which have one or more empty entries at the end.
- src/cff/cffload.c
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/***************************************************************************/ /* */ /* cffload.c */ /* */ /* OpenType and CFF data/program tables loader (body). */ /* */ /* Copyright 1996-2013 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 #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 /* 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_Error error; FT_Memory memory = stream->memory; FT_UShort count; FT_MEM_ZERO( idx, sizeof ( *idx ) ); idx->stream = stream; idx->start = FT_STREAM_POS(); if ( !FT_READ_USHORT( count ) && 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 + 3 + 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_MEM_ZERO( idx, sizeof ( *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 == NULL ) { 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 + 3 ) || 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_OFF3( 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_Error error = FT_Err_Ok; FT_Memory memory = idx->stream->memory; FT_Byte** t = NULL; FT_Byte* new_bytes = NULL; *table = NULL; if ( idx->offsets == NULL ) { error = cff_index_load_offsets( idx ); if ( error ) goto Exit; } if ( idx->count > 0 && !FT_NEW_ARRAY( t, idx->count + 1 ) && ( !pool || !FT_ALLOC( new_bytes, idx->data_size + idx->count ) ) ) { 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; } 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 + 3 + 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 = 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; } /* 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; 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; 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 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 = 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 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_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; } static FT_Error cff_subfont_load( CFF_SubFont font, CFF_Index idx, FT_UInt font_index, FT_Stream stream, FT_ULong base_offset, FT_Library library ) { FT_Error error; CFF_ParserRec parser; FT_Byte* dict = NULL; 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, library ); /* 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 ); if ( !error ) { FT_TRACE4(( " top dictionary:\n" )); error = 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, library ); if ( FT_STREAM_SEEK( base_offset + font->font_dict.private_offset ) || FT_FRAME_ENTER( font->font_dict.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; } /* 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( &font->local_subrs_index, stream, 1 ); if ( error ) goto Exit; error = cff_index_get_pointers( &font->local_subrs_index, &font->local_subrs, NULL ); if ( error ) goto Exit; } Exit: 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_LOCAL_DEF( FT_Error ) cff_font_load( FT_Library library, FT_Stream stream, FT_Int face_index, CFF_Font font, FT_Bool pure_cff ) { 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; CFF_IndexRec string_index; FT_Int subfont_index; FT_ZERO( font ); FT_ZERO( &string_index ); 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 = FT_THROW( 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_index_init( &font->name_index, stream, 0 ) ) || FT_SET_ERROR( cff_index_init( &font->font_dict_index, stream, 0 ) ) || FT_SET_ERROR( cff_index_init( &string_index, stream, 1 ) ) || FT_SET_ERROR( cff_index_init( &font->global_subrs_index, stream, 1 ) ) || FT_SET_ERROR( cff_index_get_pointers( &string_index, &font->strings, &font->string_pool ) ) ) goto Exit; font->num_strings = string_index.count; if ( pure_cff ) { /* well, we don't really forget the `disabled' fonts... */ subfont_index = face_index; if ( subfont_index >= (FT_Int)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, library ); if ( error ) goto Exit; if ( FT_STREAM_SEEK( base_offset + dict->charstrings_offset ) ) goto Exit; error = cff_index_init( &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 = NULL; 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_index_init( &fd_index, stream, 0 ); if ( error ) goto Exit; 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, library ); 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_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 ); if ( error ) goto Exit; /* read the Charset and Encoding tables if available */ if ( 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 */ 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_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 */