| /***************************************************************************/ |
| /* */ |
| /* cidload.c */ |
| /* */ |
| /* CID-keyed Type1 font loader (body). */ |
| /* */ |
| /* Copyright 1996-2000 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 FT_INTERNAL_TYPE1_ERRORS_H |
| #include FT_SOURCE_FILE(cid,cidload.h) |
| |
| #include <stdio.h> |
| #include <ctype.h> /* for isspace(), isalnum() */ |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* 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_Long cid_get_offset( FT_Byte** start, |
| FT_Byte offsize ) |
| { |
| FT_Long result; |
| FT_Byte* p = *start; |
| |
| |
| for ( result = 0; offsize > 0; offsize-- ) |
| { |
| result <<= 8; |
| result |= *p++; |
| } |
| |
| *start = p; |
| return result; |
| } |
| |
| |
| FT_LOCAL_DEF |
| void cid_decrypt( FT_Byte* buffer, |
| FT_Int length, |
| FT_UShort seed ) |
| { |
| while ( length > 0 ) |
| { |
| FT_Byte plain; |
| |
| |
| plain = ( *buffer ^ ( seed >> 8 ) ); |
| seed = ( *buffer + seed ) * 52845 + 22719; |
| *buffer++ = plain; |
| length--; |
| } |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** 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_Info* cid = &face->cid; |
| |
| |
| /* if the keyword has a dedicated callback, call it */ |
| if ( keyword->type == t1_field_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_cid_info: |
| object = (FT_Byte*)cid; |
| break; |
| |
| case t1_field_font_info: |
| object = (FT_Byte*)&cid->font_info; |
| break; |
| |
| default: |
| { |
| CID_FontDict* dict; |
| |
| |
| if ( parser->num_dict < 0 ) |
| { |
| FT_ERROR(( "cid_load_keyword: invalid use of `%s'!\n", |
| keyword->ident )); |
| error = T1_Err_Syntax_Error; |
| goto Exit; |
| } |
| |
| dict = cid->font_dicts + parser->num_dict; |
| switch ( keyword->location ) |
| { |
| case t1_field_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_integer_array || |
| keyword->type == t1_field_fixed_array ) |
| error = CID_Load_Field_Table( &loader->parser, keyword, |
| &dummy_object ); |
| else |
| error = CID_Load_Field( &loader->parser, keyword, &dummy_object ); |
| Exit: |
| return error; |
| } |
| |
| |
| FT_CALLBACK_DEF |
| FT_Error parse_font_bbox( CID_Face face, |
| CID_Parser* parser ) |
| { |
| FT_Fixed temp[4]; |
| FT_BBox* bbox = &face->cid.font_bbox; |
| |
| |
| (void)CID_ToFixedArray( parser, 4, temp, 0 ); |
| bbox->xMin = FT_RoundFix( temp[0] ); |
| bbox->yMin = FT_RoundFix( temp[1] ); |
| bbox->xMax = FT_RoundFix( temp[2] ); |
| bbox->yMax = FT_RoundFix( temp[3] ); |
| |
| return T1_Err_Ok; /* this is a callback function; */ |
| /* we must return an error code */ |
| } |
| |
| |
| FT_CALLBACK_DEF |
| FT_Error parse_font_matrix( CID_Face face, |
| CID_Parser* parser ) |
| { |
| FT_Matrix* matrix; |
| FT_Vector* offset; |
| CID_FontDict* dict; |
| FT_Face root = (FT_Face)&face->root; |
| FT_Fixed temp[6]; |
| FT_Fixed temp_scale; |
| |
| |
| if ( parser->num_dict >= 0 ) |
| { |
| dict = face->cid.font_dicts + parser->num_dict; |
| matrix = &dict->font_matrix; |
| offset = &dict->font_offset; |
| |
| (void)CID_ToFixedArray( parser, 6, temp, 3 ); |
| |
| temp_scale = ABS( temp[3] ); |
| |
| /* Set Units per EM based on FontMatrix values. We set the value to */ |
| /* `1000/temp_scale', because temp_scale was already multiplied by */ |
| /* 1000 (in t1_tofixed(), from psobjs.c). */ |
| root->units_per_EM = (FT_UShort)FT_DivFix( 0x10000L, |
| FT_DivFix( temp_scale, 1000 ) ); |
| |
| /* we need to scale the values by 1.0/temp[3] */ |
| if ( temp_scale != 0x10000L ) |
| { |
| 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] = 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 T1_Err_Ok; /* this is a callback function; */ |
| /* we must return an error code */ |
| } |
| |
| |
| FT_CALLBACK_DEF |
| FT_Error parse_fd_array( CID_Face face, |
| CID_Parser* parser ) |
| { |
| CID_Info* cid = &face->cid; |
| FT_Memory memory = face->root.memory; |
| FT_Error error = T1_Err_Ok; |
| FT_Long num_dicts; |
| |
| |
| num_dicts = CID_ToInt( parser ); |
| |
| if ( !cid->font_dicts ) |
| { |
| FT_Int n; |
| |
| |
| if ( ALLOC_ARRAY( cid->font_dicts, num_dicts, CID_FontDict ) ) |
| goto Exit; |
| |
| cid->num_dicts = (FT_UInt)num_dicts; |
| |
| /* don't forget to set a few defaults */ |
| for ( n = 0; n < cid->num_dicts; n++ ) |
| { |
| CID_FontDict* dict = cid->font_dicts + n; |
| |
| |
| /* default value for lenIV */ |
| dict->private_dict.lenIV = 4; |
| } |
| } |
| |
| Exit: |
| return error; |
| } |
| |
| |
| static |
| const T1_Field cid_field_records[] = |
| { |
| |
| #ifdef FT_FLAT_COMPILE |
| |
| #include "cidtokens.h" |
| |
| #else |
| |
| #include <cid/cidtokens.h> |
| |
| #endif |
| |
| T1_FIELD_CALLBACK( "FontBBox", parse_font_bbox ) |
| T1_FIELD_CALLBACK( "FDArray", parse_fd_array ) |
| T1_FIELD_CALLBACK( "FontMatrix", parse_font_matrix ) |
| { 0, t1_field_cid_info, t1_field_none, 0, 0, 0, 0, 0 } |
| }; |
| |
| |
| static |
| int is_alpha( char c ) |
| { |
| return ( isalnum( (int)c ) || |
| c == '.' || |
| c == '_' ); |
| } |
| |
| |
| |
| static |
| FT_Error cid_parse_dict( CID_Face face, |
| CID_Loader* loader, |
| FT_Byte* base, |
| FT_Long size ) |
| { |
| CID_Parser* parser = &loader->parser; |
| |
| |
| parser->root.cursor = base; |
| parser->root.limit = base + size; |
| parser->root.error = 0; |
| |
| { |
| FT_Byte* cur = base; |
| FT_Byte* limit = cur + size; |
| |
| |
| for ( ;cur < limit; cur++ ) |
| { |
| /* look for `%ADOBeginFontDict' */ |
| if ( *cur == '%' && cur + 20 < limit && |
| strncmp( (char*)cur, "%ADOBeginFontDict", 17 ) == 0 ) |
| { |
| cur += 17; |
| |
| /* 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++; |
| } |
| /* look for immediates */ |
| else if ( *cur == '/' && cur + 2 < limit ) |
| { |
| FT_Byte* cur2; |
| FT_Int len; |
| |
| |
| cur++; |
| |
| cur2 = cur; |
| while ( cur2 < limit && is_alpha( *cur2 ) ) |
| cur2++; |
| |
| len = (FT_Int)( cur2 - cur ); |
| if ( len > 0 && len < 22 ) |
| { |
| /* now compare the immediate name to the keyword table */ |
| const T1_Field* keyword = cid_field_records; |
| |
| |
| for (;;) |
| { |
| FT_Byte* name; |
| |
| |
| name = (FT_Byte*)keyword->ident; |
| if ( !name ) |
| break; |
| |
| if ( cur[0] == name[0] && |
| len == (FT_Int)strlen( (const char*)name ) ) |
| { |
| FT_Int 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.cursor = cur2; |
| CID_Skip_Spaces( parser ); |
| parser->root.error = cid_load_keyword( face, |
| loader, |
| keyword ); |
| if ( parser->root.error ) |
| return parser->root.error; |
| |
| cur = parser->root.cursor; |
| break; |
| } |
| } |
| keyword++; |
| } |
| } |
| } |
| } |
| } |
| return parser->root.error; |
| } |
| |
| |
| /* read the subrmap and the subrs of each font dict */ |
| static |
| FT_Error cid_read_subrs( CID_Face face ) |
| { |
| CID_Info* cid = &face->cid; |
| FT_Memory memory = face->root.memory; |
| FT_Stream stream = face->root.stream; |
| FT_Error error; |
| FT_Int n; |
| CID_Subrs* subr; |
| FT_UInt max_offsets = 0; |
| FT_ULong* offsets = 0; |
| |
| |
| if ( ALLOC_ARRAY( face->subrs, cid->num_dicts, CID_Subrs ) ) |
| goto Exit; |
| |
| subr = face->subrs; |
| for ( n = 0; n < cid->num_dicts; n++, subr++ ) |
| { |
| CID_FontDict* 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; |
| |
| |
| /* reallocate offsets array if needed */ |
| if ( num_subrs + 1 > max_offsets ) |
| { |
| FT_UInt new_max = ( num_subrs + 1 + 3 ) & -4; |
| |
| |
| if ( REALLOC_ARRAY( offsets, max_offsets, new_max, FT_ULong ) ) |
| goto Fail; |
| |
| max_offsets = new_max; |
| } |
| |
| /* read the subrmap's offsets */ |
| if ( FILE_Seek( cid->data_offset + dict->subrmap_offset ) || |
| ACCESS_Frame( ( num_subrs + 1 ) * 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 ); |
| |
| FORGET_Frame(); |
| |
| /* now, compute the size of subrs charstrings, */ |
| /* allocate, and read them */ |
| data_len = offsets[num_subrs] - offsets[0]; |
| |
| if ( ALLOC_ARRAY( subr->code, num_subrs + 1, FT_Byte* ) || |
| ALLOC( subr->code[0], data_len ) ) |
| goto Fail; |
| |
| if ( FILE_Seek( cid->data_offset + offsets[0] ) || |
| FILE_Read( subr->code[0], data_len ) ) |
| goto Exit; |
| |
| /* set up pointers */ |
| for ( count = 1; count <= num_subrs; count++ ) |
| { |
| FT_UInt 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_UInt len; |
| |
| |
| len = offsets[count + 1] - offsets[count]; |
| cid_decrypt( subr->code[count], len, 4330 ); |
| } |
| } |
| |
| subr->num_subrs = num_subrs; |
| } |
| |
| Exit: |
| FREE( offsets ); |
| return error; |
| |
| Fail: |
| if ( face->subrs ) |
| { |
| for ( n = 0; n < cid->num_dicts; n++ ) |
| { |
| if ( face->subrs[n].code ) |
| FREE( face->subrs[n].code[0] ); |
| |
| FREE( face->subrs[n].code ); |
| } |
| FREE( face->subrs ); |
| } |
| goto Exit; |
| } |
| |
| |
| static |
| void t1_init_loader( CID_Loader* loader, |
| CID_Face face ) |
| { |
| FT_UNUSED( face ); |
| |
| MEM_Set( loader, 0, sizeof ( *loader ) ); |
| } |
| |
| |
| static |
| void t1_done_loader( CID_Loader* loader ) |
| { |
| CID_Parser* parser = &loader->parser; |
| |
| |
| /* finalize parser */ |
| CID_Done_Parser( parser ); |
| } |
| |
| |
| FT_LOCAL_DEF |
| FT_Error CID_Open_Face( CID_Face face ) |
| { |
| CID_Loader loader; |
| CID_Parser* parser; |
| FT_Error error; |
| |
| |
| t1_init_loader( &loader, face ); |
| |
| parser = &loader.parser; |
| error = CID_New_Parser( parser, face->root.stream, face->root.memory, |
| (PSAux_Interface*)face->psaux ); |
| if ( error ) |
| goto Exit; |
| |
| error = cid_parse_dict( face, &loader, |
| parser->postscript, |
| parser->postscript_len ); |
| if ( error ) |
| goto Exit; |
| |
| face->cid.data_offset = loader.parser.data_offset; |
| error = cid_read_subrs( face ); |
| |
| Exit: |
| t1_done_loader( &loader ); |
| return error; |
| } |
| |
| |
| /* END */ |