Edit
kc3-lang/freetype/src/cid/cidload.c
Werner Lemberg
- src/cid/cidload.c
-
/***************************************************************************/ /* */ /* cidload.c */ /* */ /* CID-keyed Type1 font loader (body). */ /* */ /* Copyright 1996-2018 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_CONFIG_CONFIG_H #include FT_MULTIPLE_MASTERS_H #include FT_INTERNAL_TYPE1_TYPES_H #include "cidload.h" #include "ciderrs.h" /*************************************************************************/ /* */ /* 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_cidload /* read a single offset */ FT_LOCAL_DEF( FT_ULong ) cid_get_offset( FT_Byte* *start, FT_Byte offsize ) { FT_ULong result; FT_Byte* p = *start; for ( result = 0; offsize > 0; offsize-- ) { result <<= 8; result |= *p++; } *start = p; return result; } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** TYPE 1 SYMBOL PARSING *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ static FT_Error cid_load_keyword( CID_Face face, CID_Loader* loader, const T1_Field keyword ) { FT_Error error; CID_Parser* parser = &loader->parser; FT_Byte* object; void* dummy_object; CID_FaceInfo cid = &face->cid; /* if the keyword has a dedicated callback, call it */ if ( keyword->type == T1_FIELD_TYPE_CALLBACK ) { keyword->reader( (FT_Face)face, parser ); error = parser->root.error; goto Exit; } /* we must now compute the address of our target object */ switch ( keyword->location ) { case T1_FIELD_LOCATION_CID_INFO: object = (FT_Byte*)cid; break; case T1_FIELD_LOCATION_FONT_INFO: object = (FT_Byte*)&cid->font_info; break; case T1_FIELD_LOCATION_FONT_EXTRA: object = (FT_Byte*)&face->font_extra; break; case T1_FIELD_LOCATION_BBOX: object = (FT_Byte*)&cid->font_bbox; break; default: { CID_FaceDict dict; if ( parser->num_dict < 0 || parser->num_dict >= cid->num_dicts ) { FT_ERROR(( "cid_load_keyword: invalid use of `%s'\n", keyword->ident )); error = FT_THROW( Syntax_Error ); goto Exit; } dict = cid->font_dicts + parser->num_dict; switch ( keyword->location ) { case T1_FIELD_LOCATION_PRIVATE: object = (FT_Byte*)&dict->private_dict; break; default: object = (FT_Byte*)dict; } } } dummy_object = object; /* now, load the keyword data in the object's field(s) */ if ( keyword->type == T1_FIELD_TYPE_INTEGER_ARRAY || keyword->type == T1_FIELD_TYPE_FIXED_ARRAY ) error = cid_parser_load_field_table( &loader->parser, keyword, &dummy_object ); else error = cid_parser_load_field( &loader->parser, keyword, &dummy_object ); Exit: return error; } FT_CALLBACK_DEF( FT_Error ) cid_parse_font_matrix( CID_Face face, CID_Parser* parser ) { CID_FaceDict dict; FT_Face root = (FT_Face)&face->root; FT_Fixed temp[6]; FT_Fixed temp_scale; if ( parser->num_dict >= 0 && parser->num_dict < face->cid.num_dicts ) { FT_Matrix* matrix; FT_Vector* offset; FT_Int result; dict = face->cid.font_dicts + parser->num_dict; matrix = &dict->font_matrix; offset = &dict->font_offset; /* input is scaled by 1000 to accommodate default FontMatrix */ result = cid_parser_to_fixed_array( parser, 6, temp, 3 ); if ( result < 6 ) return FT_THROW( Invalid_File_Format ); temp_scale = FT_ABS( temp[3] ); if ( temp_scale == 0 ) { FT_ERROR(( "cid_parse_font_matrix: invalid font matrix\n" )); return FT_THROW( Invalid_File_Format ); } /* atypical case */ if ( temp_scale != 0x10000L ) { /* set units per EM based on FontMatrix values */ root->units_per_EM = (FT_UShort)FT_DivFix( 1000, temp_scale ); temp[0] = FT_DivFix( temp[0], temp_scale ); temp[1] = FT_DivFix( temp[1], temp_scale ); temp[2] = FT_DivFix( temp[2], temp_scale ); temp[4] = FT_DivFix( temp[4], temp_scale ); temp[5] = FT_DivFix( temp[5], temp_scale ); temp[3] = temp[3] < 0 ? -0x10000L : 0x10000L; } matrix->xx = temp[0]; matrix->yx = temp[1]; matrix->xy = temp[2]; matrix->yy = temp[3]; /* note that the font offsets are expressed in integer font units */ offset->x = temp[4] >> 16; offset->y = temp[5] >> 16; } return FT_Err_Ok; } FT_CALLBACK_DEF( FT_Error ) parse_fd_array( CID_Face face, CID_Parser* parser ) { CID_FaceInfo cid = &face->cid; FT_Memory memory = face->root.memory; FT_Stream stream = parser->stream; FT_Error error = FT_Err_Ok; FT_Long num_dicts; num_dicts = cid_parser_to_int( parser ); if ( num_dicts < 0 ) { FT_ERROR(( "parse_fd_array: invalid number of dictionaries\n" )); error = FT_THROW( Invalid_File_Format ); goto Exit; } /* * A single entry in the FDArray must (at least) contain the following * structure elements. * * %ADOBeginFontDict 18 * X dict begin 13 * /FontMatrix [X X X X] 22 * /Private X dict begin 22 * end 4 * end 4 * %ADOEndFontDict 16 * * This needs 18+13+22+22+4+4+16=99 bytes or more. Normally, you also * need a `dup X' at the very beginning and a `put' at the end, so a * rough guess using 100 bytes as the minimum is justified. */ if ( (FT_ULong)num_dicts > stream->size / 100 ) { FT_TRACE0(( "parse_fd_array: adjusting FDArray size" " (from %d to %d)\n", num_dicts, stream->size / 100 )); num_dicts = (FT_Long)( stream->size / 100 ); } if ( !cid->font_dicts ) { FT_Int n; if ( FT_NEW_ARRAY( cid->font_dicts, num_dicts ) ) goto Exit; cid->num_dicts = num_dicts; /* don't forget to set a few defaults */ for ( n = 0; n < cid->num_dicts; n++ ) { CID_FaceDict dict = cid->font_dicts + n; /* default value for lenIV */ dict->private_dict.lenIV = 4; } } Exit: return error; } /* by mistake, `expansion_factor' appears both in PS_PrivateRec */ /* and CID_FaceDictRec (both are public header files and can't */ /* changed); we simply copy the value */ FT_CALLBACK_DEF( FT_Error ) parse_expansion_factor( CID_Face face, CID_Parser* parser ) { CID_FaceDict dict; if ( parser->num_dict >= 0 && parser->num_dict < face->cid.num_dicts ) { dict = face->cid.font_dicts + parser->num_dict; dict->expansion_factor = cid_parser_to_fixed( parser, 0 ); dict->private_dict.expansion_factor = dict->expansion_factor; } return FT_Err_Ok; } static const T1_FieldRec cid_field_records[] = { #include "cidtoken.h" T1_FIELD_CALLBACK( "FDArray", parse_fd_array, 0 ) T1_FIELD_CALLBACK( "FontMatrix", cid_parse_font_matrix, 0 ) T1_FIELD_CALLBACK( "ExpansionFactor", parse_expansion_factor, 0 ) { 0, T1_FIELD_LOCATION_CID_INFO, T1_FIELD_TYPE_NONE, 0, 0, 0, 0, 0, 0 } }; static FT_Error cid_parse_dict( CID_Face face, CID_Loader* loader, FT_Byte* base, FT_ULong size ) { CID_Parser* parser = &loader->parser; parser->root.cursor = base; parser->root.limit = base + size; parser->root.error = FT_Err_Ok; { FT_Byte* cur = base; FT_Byte* limit = cur + size; for (;;) { FT_Byte* newlimit; parser->root.cursor = cur; cid_parser_skip_spaces( parser ); if ( parser->root.cursor >= limit ) newlimit = limit - 1 - 17; else newlimit = parser->root.cursor - 17; /* look for `%ADOBeginFontDict' */ for ( ; cur < newlimit; cur++ ) { if ( *cur == '%' && ft_strncmp( (char*)cur, "%ADOBeginFontDict", 17 ) == 0 ) { /* if /FDArray was found, then cid->num_dicts is > 0, and */ /* we can start increasing parser->num_dict */ if ( face->cid.num_dicts > 0 ) parser->num_dict++; } } cur = parser->root.cursor; /* no error can occur in cid_parser_skip_spaces */ if ( cur >= limit ) break; cid_parser_skip_PS_token( parser ); if ( parser->root.cursor >= limit || parser->root.error ) break; /* look for immediates */ if ( *cur == '/' && cur + 2 < limit ) { FT_UInt len; cur++; len = (FT_UInt)( parser->root.cursor - cur ); if ( len > 0 && len < 22 ) { /* now compare the immediate name to the keyword table */ T1_Field keyword = (T1_Field)cid_field_records; for (;;) { FT_Byte* name; name = (FT_Byte*)keyword->ident; if ( !name ) break; if ( cur[0] == name[0] && len == ft_strlen( (const char*)name ) ) { FT_UInt n; for ( n = 1; n < len; n++ ) if ( cur[n] != name[n] ) break; if ( n >= len ) { /* we found it - run the parsing callback */ parser->root.error = cid_load_keyword( face, loader, keyword ); if ( parser->root.error ) return parser->root.error; break; } } keyword++; } } } cur = parser->root.cursor; } if ( !face->cid.num_dicts ) { FT_ERROR(( "cid_parse_dict: No font dictionary found\n" )); return FT_THROW( Invalid_File_Format ); } } return parser->root.error; } /* read the subrmap and the subrs of each font dict */ static FT_Error cid_read_subrs( CID_Face face ) { CID_FaceInfo cid = &face->cid; FT_Memory memory = face->root.memory; FT_Stream stream = face->cid_stream; FT_Error error; FT_Int n; CID_Subrs subr; FT_UInt max_offsets = 0; FT_ULong* offsets = NULL; PSAux_Service psaux = (PSAux_Service)face->psaux; if ( FT_NEW_ARRAY( face->subrs, cid->num_dicts ) ) goto Exit; subr = face->subrs; for ( n = 0; n < cid->num_dicts; n++, subr++ ) { CID_FaceDict dict = cid->font_dicts + n; FT_Int lenIV = dict->private_dict.lenIV; FT_UInt count, num_subrs = dict->num_subrs; FT_ULong data_len; FT_Byte* p; if ( !num_subrs ) continue; /* reallocate offsets array if needed */ if ( num_subrs + 1 > max_offsets ) { FT_UInt new_max = FT_PAD_CEIL( num_subrs + 1, 4 ); if ( new_max <= max_offsets ) { error = FT_THROW( Syntax_Error ); goto Fail; } if ( FT_RENEW_ARRAY( offsets, max_offsets, new_max ) ) goto Fail; max_offsets = new_max; } /* read the subrmap's offsets */ if ( FT_STREAM_SEEK( cid->data_offset + dict->subrmap_offset ) || FT_FRAME_ENTER( ( num_subrs + 1 ) * (FT_UInt)dict->sd_bytes ) ) goto Fail; p = (FT_Byte*)stream->cursor; for ( count = 0; count <= num_subrs; count++ ) offsets[count] = cid_get_offset( &p, (FT_Byte)dict->sd_bytes ); FT_FRAME_EXIT(); /* offsets must be ordered */ for ( count = 1; count <= num_subrs; count++ ) if ( offsets[count - 1] > offsets[count] ) { FT_ERROR(( "cid_read_subrs: offsets are not ordered\n" )); error = FT_THROW( Invalid_File_Format ); goto Fail; } if ( offsets[num_subrs] > stream->size - cid->data_offset ) { FT_ERROR(( "cid_read_subrs: too large `subrs' offsets\n" )); error = FT_THROW( Invalid_File_Format ); goto Fail; } /* now, compute the size of subrs charstrings, */ /* allocate, and read them */ data_len = offsets[num_subrs] - offsets[0]; if ( FT_NEW_ARRAY( subr->code, num_subrs + 1 ) || FT_ALLOC( subr->code[0], data_len ) ) goto Fail; if ( FT_STREAM_SEEK( cid->data_offset + offsets[0] ) || FT_STREAM_READ( subr->code[0], data_len ) ) goto Fail; /* set up pointers */ for ( count = 1; count <= num_subrs; count++ ) { FT_ULong len; len = offsets[count] - offsets[count - 1]; subr->code[count] = subr->code[count - 1] + len; } /* decrypt subroutines, but only if lenIV >= 0 */ if ( lenIV >= 0 ) { for ( count = 0; count < num_subrs; count++ ) { FT_ULong len; len = offsets[count + 1] - offsets[count]; psaux->t1_decrypt( subr->code[count], len, 4330 ); } } subr->num_subrs = (FT_Int)num_subrs; } Exit: FT_FREE( offsets ); return error; Fail: if ( face->subrs ) { for ( n = 0; n < cid->num_dicts; n++ ) { if ( face->subrs[n].code ) FT_FREE( face->subrs[n].code[0] ); FT_FREE( face->subrs[n].code ); } FT_FREE( face->subrs ); } goto Exit; } static void cid_init_loader( CID_Loader* loader, CID_Face face ) { FT_UNUSED( face ); FT_ZERO( loader ); } static void cid_done_loader( CID_Loader* loader ) { CID_Parser* parser = &loader->parser; /* finalize parser */ cid_parser_done( parser ); } static FT_Error cid_hex_to_binary( FT_Byte* data, FT_ULong data_len, FT_ULong offset, CID_Face face ) { FT_Stream stream = face->root.stream; FT_Error error; FT_Byte buffer[256]; FT_Byte *p, *plimit; FT_Byte *d, *dlimit; FT_Byte val; FT_Bool upper_nibble, done; if ( FT_STREAM_SEEK( offset ) ) goto Exit; d = data; dlimit = d + data_len; p = buffer; plimit = p; upper_nibble = 1; done = 0; while ( d < dlimit ) { if ( p >= plimit ) { FT_ULong oldpos = FT_STREAM_POS(); FT_ULong size = stream->size - oldpos; if ( size == 0 ) { error = FT_THROW( Syntax_Error ); goto Exit; } if ( FT_STREAM_READ( buffer, 256 > size ? size : 256 ) ) goto Exit; p = buffer; plimit = p + FT_STREAM_POS() - oldpos; } if ( ft_isdigit( *p ) ) val = (FT_Byte)( *p - '0' ); else if ( *p >= 'a' && *p <= 'f' ) val = (FT_Byte)( *p - 'a' ); else if ( *p >= 'A' && *p <= 'F' ) val = (FT_Byte)( *p - 'A' + 10 ); else if ( *p == ' ' || *p == '\t' || *p == '\r' || *p == '\n' || *p == '\f' || *p == '\0' ) { p++; continue; } else if ( *p == '>' ) { val = 0; done = 1; } else { error = FT_THROW( Syntax_Error ); goto Exit; } if ( upper_nibble ) *d = (FT_Byte)( val << 4 ); else { *d = (FT_Byte)( *d + val ); d++; } upper_nibble = (FT_Byte)( 1 - upper_nibble ); if ( done ) break; p++; } error = FT_Err_Ok; Exit: return error; } FT_LOCAL_DEF( FT_Error ) cid_face_open( CID_Face face, FT_Int face_index ) { CID_Loader loader; CID_Parser* parser; FT_Memory memory = face->root.memory; FT_Error error; FT_Int n; CID_FaceInfo cid = &face->cid; FT_ULong binary_length; FT_ULong entry_len; cid_init_loader( &loader, face ); parser = &loader.parser; error = cid_parser_new( parser, face->root.stream, face->root.memory, (PSAux_Service)face->psaux ); if ( error ) goto Exit; error = cid_parse_dict( face, &loader, parser->postscript, parser->postscript_len ); if ( error ) goto Exit; if ( face_index < 0 ) goto Exit; if ( FT_NEW( face->cid_stream ) ) goto Exit; if ( parser->binary_length ) { if ( parser->binary_length > face->root.stream->size - parser->data_offset ) { FT_TRACE0(( "cid_face_open: adjusting length of binary data\n" " (from %d to %d bytes)\n", parser->binary_length, face->root.stream->size - parser->data_offset )); parser->binary_length = face->root.stream->size - parser->data_offset; } /* we must convert the data section from hexadecimal to binary */ if ( FT_ALLOC( face->binary_data, parser->binary_length ) || FT_SET_ERROR( cid_hex_to_binary( face->binary_data, parser->binary_length, parser->data_offset, face ) ) ) goto Exit; FT_Stream_OpenMemory( face->cid_stream, face->binary_data, parser->binary_length ); cid->data_offset = 0; } else { *face->cid_stream = *face->root.stream; cid->data_offset = loader.parser.data_offset; } /* sanity tests */ if ( cid->fd_bytes < 0 || cid->gd_bytes < 1 ) { FT_ERROR(( "cid_parse_dict:" " Invalid `FDBytes' or `GDBytes' value\n" )); error = FT_THROW( Invalid_File_Format ); goto Exit; } /* allow at most 32bit offsets */ if ( cid->fd_bytes > 4 || cid->gd_bytes > 4 ) { FT_ERROR(( "cid_parse_dict:" " Values of `FDBytes' or `GDBytes' larger than 4\n" " " " are not supported\n" )); error = FT_THROW( Invalid_File_Format ); goto Exit; } binary_length = face->cid_stream->size - cid->data_offset; entry_len = (FT_ULong)( cid->fd_bytes + cid->gd_bytes ); for ( n = 0; n < cid->num_dicts; n++ ) { CID_FaceDict dict = cid->font_dicts + n; if ( dict->sd_bytes < 0 || ( dict->num_subrs && dict->sd_bytes < 1 ) ) { FT_ERROR(( "cid_parse_dict: Invalid `SDBytes' value\n" )); error = FT_THROW( Invalid_File_Format ); goto Exit; } if ( dict->sd_bytes > 4 ) { FT_ERROR(( "cid_parse_dict:" " Values of `SDBytes' larger than 4" " are not supported\n" )); error = FT_THROW( Invalid_File_Format ); goto Exit; } if ( dict->subrmap_offset > binary_length ) { FT_ERROR(( "cid_parse_dict: Invalid `SubrMapOffset' value\n" )); error = FT_THROW( Invalid_File_Format ); goto Exit; } /* `num_subrs' is scanned as a signed integer */ if ( (FT_Int)dict->num_subrs < 0 || ( dict->sd_bytes && dict->num_subrs > ( binary_length - dict->subrmap_offset ) / (FT_UInt)dict->sd_bytes ) ) { FT_ERROR(( "cid_parse_dict: Invalid `SubrCount' value\n" )); error = FT_THROW( Invalid_File_Format ); goto Exit; } } if ( cid->cidmap_offset > binary_length ) { FT_ERROR(( "cid_parse_dict: Invalid `CIDMapOffset' value\n" )); error = FT_THROW( Invalid_File_Format ); goto Exit; } if ( entry_len && cid->cid_count > ( binary_length - cid->cidmap_offset ) / entry_len ) { FT_ERROR(( "cid_parse_dict: Invalid `CIDCount' value\n" )); error = FT_THROW( Invalid_File_Format ); goto Exit; } /* we can now safely proceed */ error = cid_read_subrs( face ); Exit: cid_done_loader( &loader ); return error; } /* END */