+++ /dev/null
-/***************************************************************************/
-/* */
-/* cidload.c */
-/* */
-/* CID-keyed Type1 font loader (body). */
-/* */
-/* Copyright 1996-2001 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"
-
-#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_Offset length,
- FT_UShort seed )
- {
- while ( length > 0 )
- {
- FT_Byte plain;
-
-
- plain = (FT_Byte)( *buffer ^ ( seed >> 8 ) );
- seed = (FT_UShort)( ( *buffer + seed ) * 52845U + 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 = CID_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 CID_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 CID_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 = CID_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[] =
- {
-
-#include "cidtoken.h"
-
- 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 */
projects / rrdtool.git / blobdiff