Edit
kc3-lang/freetype/src/cid/cidload.c
Werner Lemberg
- src/cid/cidload.c
-
/***************************************************************************/ /* */ /* 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 <freetype/internal/ftdebug.h> #include <freetype/config/ftconfig.h> #include <freetype/ftmm.h> #include <freetype/internal/t1types.h> #include <freetype/internal/t1errors.h> #ifdef FT_FLAT_COMPILE #include "cidload.h" #else #include <cid/cidload.h> #endif #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 */ LOCAL_FUNC 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; } LOCAL_FUNC 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 CID_Field_Rec* keyword ) { FT_Error error; CID_Parser* parser = &loader->parser; FT_Byte* object; CID_Info* cid = &face->cid; /* if the keyword has a dedicated callback, call it */ if ( keyword->type == t1_field_callback ) { error = keyword->reader( face, parser ); 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; } } } /* 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( parser, keyword, object ); else error = CID_Load_Field( parser, keyword, object ); Exit: return error; } static FT_Error parse_font_bbox( CID_Face face, CID_Parser* parser ) { FT_Short temp[4]; FT_BBox* bbox = &face->cid.font_bbox; (void)CID_ToCoordArray( parser, 4, temp ); bbox->xMin = temp[0]; bbox->yMin = temp[1]; bbox->xMax = temp[2]; bbox->yMax = temp[3]; return T1_Err_Ok; /* this is a callback function; */ /* we must return an error code */ } static FT_Error parse_font_matrix( CID_Face face, CID_Parser* parser ) { FT_Matrix* matrix; CID_FontDict* dict; FT_Fixed temp[4]; if ( parser->num_dict >= 0 ) { dict = face->cid.font_dicts + parser->num_dict; matrix = &dict->font_matrix; (void)CID_ToFixedArray( parser, 4, temp, 3 ); matrix->xx = temp[0]; matrix->yx = temp[1]; matrix->xy = temp[2]; matrix->yy = temp[3]; } return T1_Err_Ok; /* this is a callback function; */ /* we must return an error code */ } static 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 CID_Field_Rec t1_field_records[] = { #ifdef FT_FLAT_COMPILE #include "cidtokens.h" #else #include <cid/cidtokens.h> #endif { 0, t1_field_cid_info, t1_field_none, 0, 0, 0, 0, 0 } }; static int is_alpha( char c ) { return ( isalnum( c ) || c == '.' || c == '_' ); } static void skip_whitespace( CID_Parser* parser ) { FT_Byte* cur = parser->cursor; while ( cur < parser->limit && isspace( *cur ) ) cur++; parser->cursor = cur; } static FT_Error parse_dict( CID_Face face, CID_Loader* loader, FT_Byte* base, FT_Long size ) { CID_Parser* parser = &loader->parser; parser->cursor = base; parser->limit = base + size; parser->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 = cur2 - cur; if ( len > 0 && len < 22 ) { /* now compare the immediate name to the keyword table */ const CID_Field_Rec* keyword = t1_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->cursor = cur2; skip_whitespace( parser ); parser->error = cid_load_keyword( face, loader, keyword ); if ( parser->error ) return parser->error; cur = parser->cursor; break; } } keyword++; } } } } } return parser->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_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 */ 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 ); } LOCAL_FUNC 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 ); if ( error ) goto Exit; error = 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 */