ref: 07bee1c2ea89752e608d881dde2e2a4a1e738516
dir: /libfreetype/t1load.c/
/***************************************************************************/
/* */
/* t1load.c */
/* */
/* Type 1 font loader (body). */
/* */
/* Copyright 1996-2001, 2002 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. */
/* */
/***************************************************************************/
/*************************************************************************/
/* */
/* This is the new and improved Type 1 data loader for FreeType 2. The */
/* old loader has several problems: it is slow, complex, difficult to */
/* maintain, and contains incredible hacks to make it accept some */
/* ill-formed Type 1 fonts without hiccup-ing. Moreover, about 5% of */
/* the Type 1 fonts on my machine still aren't loaded correctly by it. */
/* */
/* This version is much simpler, much faster and also easier to read and */
/* maintain by a great order of magnitude. The idea behind it is to */
/* _not_ try to read the Type 1 token stream with a state machine (i.e. */
/* a Postscript-like interpreter) but rather to perform simple pattern */
/* matching. */
/* */
/* Indeed, nearly all data definitions follow a simple pattern like */
/* */
/* ... /Field <data> ... */
/* */
/* where <data> can be a number, a boolean, a string, or an array of */
/* numbers. There are a few exceptions, namely the encoding, font name, */
/* charstrings, and subrs; they are handled with a special pattern */
/* matching routine. */
/* */
/* All other common cases are handled very simply. The matching rules */
/* are defined in the file `t1tokens.h' through the use of several */
/* macros calls PARSE_XXX. */
/* */
/* This file is included twice here; the first time to generate parsing */
/* callback functions, the second to generate a table of keywords (with */
/* pointers to the associated callback). */
/* */
/* The function `parse_dict' simply scans *linearly* a given dictionary */
/* (either the top-level or private one) and calls the appropriate */
/* callback when it encounters an immediate keyword. */
/* */
/* This is by far the fastest way one can find to parse and read all */
/* data. */
/* */
/* This led to tremendous code size reduction. Note that later, the */
/* glyph loader will also be _greatly_ simplified, and the automatic */
/* hinter will replace the clumsy `t1hinter'. */
/* */
/*************************************************************************/
#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 "t1load.h"
#include "t1errors.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_t1load
#ifndef T1_CONFIG_OPTION_NO_MM_SUPPORT
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** MULTIPLE MASTERS SUPPORT *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
static FT_Error
t1_allocate_blend( T1_Face face,
FT_UInt num_designs,
FT_UInt num_axis )
{
PS_Blend blend;
FT_Memory memory = face->root.memory;
FT_Error error = 0;
blend = face->blend;
if ( !blend )
{
if ( FT_NEW( blend ) )
goto Exit;
face->blend = blend;
}
/* allocate design data if needed */
if ( num_designs > 0 )
{
if ( blend->num_designs == 0 )
{
FT_UInt nn;
/* allocate the blend `private' and `font_info' dictionaries */
if ( FT_NEW_ARRAY( blend->font_infos[1], num_designs ) ||
FT_NEW_ARRAY( blend->privates[1], num_designs ) ||
FT_NEW_ARRAY( blend->bboxes[1], num_designs ) ||
FT_NEW_ARRAY( blend->weight_vector, num_designs * 2 ) )
goto Exit;
blend->default_weight_vector = blend->weight_vector + num_designs;
blend->font_infos[0] = &face->type1.font_info;
blend->privates [0] = &face->type1.private_dict;
blend->bboxes [0] = &face->type1.font_bbox;
for ( nn = 2; nn <= num_designs; nn++ )
{
blend->privates[nn] = blend->privates [nn - 1] + 1;
blend->font_infos[nn] = blend->font_infos[nn - 1] + 1;
blend->bboxes[nn] = blend->bboxes [nn - 1] + 1;
}
blend->num_designs = num_designs;
}
else if ( blend->num_designs != num_designs )
goto Fail;
}
/* allocate axis data if needed */
if ( num_axis > 0 )
{
if ( blend->num_axis != 0 && blend->num_axis != num_axis )
goto Fail;
blend->num_axis = num_axis;
}
/* allocate the blend design pos table if needed */
num_designs = blend->num_designs;
num_axis = blend->num_axis;
if ( num_designs && num_axis && blend->design_pos[0] == 0 )
{
FT_UInt n;
if ( FT_NEW_ARRAY( blend->design_pos[0], num_designs * num_axis ) )
goto Exit;
for ( n = 1; n < num_designs; n++ )
blend->design_pos[n] = blend->design_pos[0] + num_axis * n;
}
Exit:
return error;
Fail:
error = -1;
goto Exit;
}
FT_LOCAL_DEF( FT_Error )
T1_Get_Multi_Master( T1_Face face,
FT_Multi_Master* master )
{
PS_Blend blend = face->blend;
FT_UInt n;
FT_Error error;
error = T1_Err_Invalid_Argument;
if ( blend )
{
master->num_axis = blend->num_axis;
master->num_designs = blend->num_designs;
for ( n = 0; n < blend->num_axis; n++ )
{
FT_MM_Axis* axis = master->axis + n;
PS_DesignMap map = blend->design_map + n;
axis->name = blend->axis_names[n];
axis->minimum = map->design_points[0];
axis->maximum = map->design_points[map->num_points - 1];
}
error = 0;
}
return error;
}
FT_LOCAL_DEF( FT_Error )
T1_Set_MM_Blend( T1_Face face,
FT_UInt num_coords,
FT_Fixed* coords )
{
PS_Blend blend = face->blend;
FT_Error error;
FT_UInt n, m;
error = T1_Err_Invalid_Argument;
if ( blend && blend->num_axis == num_coords )
{
/* recompute the weight vector from the blend coordinates */
error = T1_Err_Ok;
for ( n = 0; n < blend->num_designs; n++ )
{
FT_Fixed result = 0x10000L; /* 1.0 fixed */
for ( m = 0; m < blend->num_axis; m++ )
{
FT_Fixed factor;
/* get current blend axis position */
factor = coords[m];
if ( factor < 0 ) factor = 0;
if ( factor > 0x10000L ) factor = 0x10000L;
if ( ( n & ( 1 << m ) ) == 0 )
factor = 0x10000L - factor;
result = FT_MulFix( result, factor );
}
blend->weight_vector[n] = result;
}
error = T1_Err_Ok;
}
return error;
}
FT_LOCAL_DEF( FT_Error )
T1_Set_MM_Design( T1_Face face,
FT_UInt num_coords,
FT_Long* coords )
{
PS_Blend blend = face->blend;
FT_Error error;
FT_UInt n, p;
error = T1_Err_Invalid_Argument;
if ( blend && blend->num_axis == num_coords )
{
/* compute the blend coordinates through the blend design map */
FT_Fixed final_blends[T1_MAX_MM_DESIGNS];
for ( n = 0; n < blend->num_axis; n++ )
{
FT_Long design = coords[n];
FT_Fixed the_blend;
PS_DesignMap map = blend->design_map + n;
FT_Fixed* designs = map->design_points;
FT_Fixed* blends = map->blend_points;
FT_Int before = -1, after = -1;
for ( p = 0; p < (FT_UInt)map->num_points; p++ )
{
FT_Fixed p_design = designs[p];
/* exact match ? */
if ( design == p_design )
{
the_blend = blends[p];
goto Found;
}
if ( design < p_design )
{
after = p;
break;
}
before = p;
}
/* now, interpolate if needed */
if ( before < 0 )
the_blend = blends[0];
else if ( after < 0 )
the_blend = blends[map->num_points - 1];
else
the_blend = FT_MulDiv( design - designs[before],
blends [after] - blends [before],
designs[after] - designs[before] );
Found:
final_blends[n] = the_blend;
}
error = T1_Set_MM_Blend( face, num_coords, final_blends );
}
return error;
}
FT_LOCAL_DEF( void )
T1_Done_Blend( T1_Face face )
{
FT_Memory memory = face->root.memory;
PS_Blend blend = face->blend;
if ( blend )
{
FT_UInt num_designs = blend->num_designs;
FT_UInt num_axis = blend->num_axis;
FT_UInt n;
/* release design pos table */
FT_FREE( blend->design_pos[0] );
for ( n = 1; n < num_designs; n++ )
blend->design_pos[n] = 0;
/* release blend `private' and `font info' dictionaries */
FT_FREE( blend->privates[1] );
FT_FREE( blend->font_infos[1] );
FT_FREE( blend->bboxes[1] );
for ( n = 0; n < num_designs; n++ )
{
blend->privates [n] = 0;
blend->font_infos[n] = 0;
blend->bboxes [n] = 0;
}
/* release weight vectors */
FT_FREE( blend->weight_vector );
blend->default_weight_vector = 0;
/* release axis names */
for ( n = 0; n < num_axis; n++ )
FT_FREE( blend->axis_names[n] );
/* release design map */
for ( n = 0; n < num_axis; n++ )
{
PS_DesignMap dmap = blend->design_map + n;
FT_FREE( dmap->design_points );
dmap->num_points = 0;
}
FT_FREE( face->blend );
}
}
static void
parse_blend_axis_types( T1_Face face,
T1_Loader loader )
{
T1_TokenRec axis_tokens[ T1_MAX_MM_AXIS ];
FT_Int n, num_axis;
FT_Error error = 0;
PS_Blend blend;
FT_Memory memory;
/* take an array of objects */
T1_ToTokenArray( &loader->parser, axis_tokens,
T1_MAX_MM_AXIS, &num_axis );
if ( num_axis <= 0 || num_axis > T1_MAX_MM_AXIS )
{
FT_ERROR(( "parse_blend_axis_types: incorrect number of axes: %d\n",
num_axis ));
error = T1_Err_Invalid_File_Format;
goto Exit;
}
/* allocate blend if necessary */
error = t1_allocate_blend( face, 0, (FT_UInt)num_axis );
if ( error )
goto Exit;
blend = face->blend;
memory = face->root.memory;
/* each token is an immediate containing the name of the axis */
for ( n = 0; n < num_axis; n++ )
{
T1_Token token = axis_tokens + n;
FT_Byte* name;
FT_PtrDist len;
/* skip first slash, if any */
if ( token->start[0] == '/' )
token->start++;
len = token->limit - token->start;
if ( len <= 0 )
{
error = T1_Err_Invalid_File_Format;
goto Exit;
}
if ( FT_ALLOC( blend->axis_names[n], len + 1 ) )
goto Exit;
name = (FT_Byte*)blend->axis_names[n];
FT_MEM_COPY( name, token->start, len );
name[len] = 0;
}
Exit:
loader->parser.root.error = error;
}
static void
parse_blend_design_positions( T1_Face face,
T1_Loader loader )
{
T1_TokenRec design_tokens[ T1_MAX_MM_DESIGNS ];
FT_Int num_designs;
FT_Int num_axis;
T1_Parser parser = &loader->parser;
FT_Error error = 0;
PS_Blend blend;
/* get the array of design tokens - compute number of designs */
T1_ToTokenArray( parser, design_tokens, T1_MAX_MM_DESIGNS, &num_designs );
if ( num_designs <= 0 || num_designs > T1_MAX_MM_DESIGNS )
{
FT_ERROR(( "parse_blend_design_positions:" ));
FT_ERROR(( " incorrect number of designs: %d\n",
num_designs ));
error = T1_Err_Invalid_File_Format;
goto Exit;
}
{
FT_Byte* old_cursor = parser->root.cursor;
FT_Byte* old_limit = parser->root.limit;
FT_UInt n;
blend = face->blend;
num_axis = 0; /* make compiler happy */
for ( n = 0; n < (FT_UInt)num_designs; n++ )
{
T1_TokenRec axis_tokens[ T1_MAX_MM_DESIGNS ];
T1_Token token;
FT_Int axis, n_axis;
/* read axis/coordinates tokens */
token = design_tokens + n;
parser->root.cursor = token->start - 1;
parser->root.limit = token->limit + 1;
T1_ToTokenArray( parser, axis_tokens, T1_MAX_MM_AXIS, &n_axis );
if ( n == 0 )
{
num_axis = n_axis;
error = t1_allocate_blend( face, num_designs, num_axis );
if ( error )
goto Exit;
blend = face->blend;
}
else if ( n_axis != num_axis )
{
FT_ERROR(( "parse_blend_design_positions: incorrect table\n" ));
error = T1_Err_Invalid_File_Format;
goto Exit;
}
/* now, read each axis token into the design position */
for ( axis = 0; axis < n_axis; axis++ )
{
T1_Token token2 = axis_tokens + axis;
parser->root.cursor = token2->start;
parser->root.limit = token2->limit;
blend->design_pos[n][axis] = T1_ToFixed( parser, 0 );
}
}
loader->parser.root.cursor = old_cursor;
loader->parser.root.limit = old_limit;
}
Exit:
loader->parser.root.error = error;
}
static void
parse_blend_design_map( T1_Face face,
T1_Loader loader )
{
FT_Error error = 0;
T1_Parser parser = &loader->parser;
PS_Blend blend;
T1_TokenRec axis_tokens[T1_MAX_MM_AXIS];
FT_Int n, num_axis;
FT_Byte* old_cursor;
FT_Byte* old_limit;
FT_Memory memory = face->root.memory;
T1_ToTokenArray( parser, axis_tokens, T1_MAX_MM_AXIS, &num_axis );
if ( num_axis <= 0 || num_axis > T1_MAX_MM_AXIS )
{
FT_ERROR(( "parse_blend_design_map: incorrect number of axes: %d\n",
num_axis ));
error = T1_Err_Invalid_File_Format;
goto Exit;
}
old_cursor = parser->root.cursor;
old_limit = parser->root.limit;
error = t1_allocate_blend( face, 0, num_axis );
if ( error )
goto Exit;
blend = face->blend;
/* now, read each axis design map */
for ( n = 0; n < num_axis; n++ )
{
PS_DesignMap map = blend->design_map + n;
T1_Token token;
FT_Int p, num_points;
token = axis_tokens + n;
parser->root.cursor = token->start;
parser->root.limit = token->limit;
/* count the number of map points */
{
FT_Byte* ptr = token->start;
FT_Byte* limit = token->limit;
num_points = 0;
for ( ; ptr < limit; ptr++ )
if ( ptr[0] == '[' )
num_points++;
}
if ( num_points <= 0 || num_points > T1_MAX_MM_MAP_POINTS )
{
FT_ERROR(( "parse_blend_design_map: incorrect table\n" ));
error = T1_Err_Invalid_File_Format;
goto Exit;
}
/* allocate design map data */
if ( FT_NEW_ARRAY( map->design_points, num_points * 2 ) )
goto Exit;
map->blend_points = map->design_points + num_points;
map->num_points = (FT_Byte)num_points;
for ( p = 0; p < num_points; p++ )
{
map->design_points[p] = T1_ToInt( parser );
map->blend_points [p] = T1_ToFixed( parser, 0 );
}
}
parser->root.cursor = old_cursor;
parser->root.limit = old_limit;
Exit:
parser->root.error = error;
}
static void
parse_weight_vector( T1_Face face,
T1_Loader loader )
{
FT_Error error = 0;
T1_Parser parser = &loader->parser;
PS_Blend blend = face->blend;
T1_TokenRec master;
FT_UInt n;
FT_Byte* old_cursor;
FT_Byte* old_limit;
if ( !blend || blend->num_designs == 0 )
{
FT_ERROR(( "parse_weight_vector: too early!\n" ));
error = T1_Err_Invalid_File_Format;
goto Exit;
}
T1_ToToken( parser, &master );
if ( master.type != T1_TOKEN_TYPE_ARRAY )
{
FT_ERROR(( "parse_weight_vector: incorrect format!\n" ));
error = T1_Err_Invalid_File_Format;
goto Exit;
}
old_cursor = parser->root.cursor;
old_limit = parser->root.limit;
parser->root.cursor = master.start;
parser->root.limit = master.limit;
for ( n = 0; n < blend->num_designs; n++ )
{
blend->default_weight_vector[n] =
blend->weight_vector[n] = T1_ToFixed( parser, 0 );
}
parser->root.cursor = old_cursor;
parser->root.limit = old_limit;
Exit:
parser->root.error = error;
}
/* the keyword `/shareddict' appears in some multiple master fonts */
/* with a lot of Postscript garbage behind it (that's completely out */
/* of spec!); we detect it and terminate the parsing */
/* */
static void
parse_shared_dict( T1_Face face,
T1_Loader loader )
{
T1_Parser parser = &loader->parser;
FT_UNUSED( face );
parser->root.cursor = parser->root.limit;
parser->root.error = 0;
}
#endif /* T1_CONFIG_OPTION_NO_MM_SUPPORT */
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** TYPE 1 SYMBOL PARSING *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* First of all, define the token field static variables. This is a set */
/* of T1_FieldRec variables used later. */
/* */
/*************************************************************************/
static FT_Error
t1_load_keyword( T1_Face face,
T1_Loader loader,
T1_Field field )
{
FT_Error error;
void* dummy_object;
void** objects;
FT_UInt max_objects;
PS_Blend blend = face->blend;
/* if the keyword has a dedicated callback, call it */
if ( field->type == T1_FIELD_TYPE_CALLBACK )
{
field->reader( (FT_Face)face, loader );
error = loader->parser.root.error;
goto Exit;
}
/* now, the keyword is either a simple field, or a table of fields; */
/* we are now going to take care of it */
switch ( field->location )
{
case T1_FIELD_LOCATION_FONT_INFO:
dummy_object = &face->type1.font_info;
objects = &dummy_object;
max_objects = 0;
if ( blend )
{
objects = (void**)blend->font_infos;
max_objects = blend->num_designs;
}
break;
case T1_FIELD_LOCATION_PRIVATE:
dummy_object = &face->type1.private_dict;
objects = &dummy_object;
max_objects = 0;
if ( blend )
{
objects = (void**)blend->privates;
max_objects = blend->num_designs;
}
break;
case T1_FIELD_LOCATION_BBOX:
dummy_object = &face->type1.font_bbox;
objects = &dummy_object;
max_objects = 0;
if ( blend )
{
objects = (void**)blend->bboxes;
max_objects = blend->num_designs;
}
break;
default:
dummy_object = &face->type1;
objects = &dummy_object;
max_objects = 0;
}
if ( field->type == T1_FIELD_TYPE_INTEGER_ARRAY ||
field->type == T1_FIELD_TYPE_FIXED_ARRAY )
error = T1_Load_Field_Table( &loader->parser, field,
objects, max_objects, 0 );
else
error = T1_Load_Field( &loader->parser, field,
objects, max_objects, 0 );
Exit:
return error;
}
static int
is_space( FT_Byte c )
{
return ( c == ' ' || c == '\t' || c == '\r' || c == '\n' );
}
static int
is_alpha( FT_Byte c )
{
/* Note: we must accept "+" as a valid character, as it is used in */
/* embedded type1 fonts in PDF documents. */
/* */
return ( ft_isalnum( c ) ||
c == '.' ||
c == '_' ||
c == '-' ||
c == '+' );
}
static int
read_binary_data( T1_Parser parser,
FT_Long* size,
FT_Byte** base )
{
FT_Byte* cur;
FT_Byte* limit = parser->root.limit;
/* the binary data has the following format */
/* */
/* `size' [white*] RD white ....... ND */
/* */
T1_Skip_Spaces( parser );
cur = parser->root.cursor;
if ( cur < limit && (FT_Byte)( *cur - '0' ) < 10 )
{
*size = T1_ToInt( parser );
T1_Skip_Spaces( parser );
T1_Skip_Alpha ( parser ); /* `RD' or `-|' or something else */
/* there is only one whitespace char after the */
/* `RD' or `-|' token */
*base = parser->root.cursor + 1;
parser->root.cursor += *size + 1;
return 1;
}
FT_ERROR(( "read_binary_data: invalid size field\n" ));
parser->root.error = T1_Err_Invalid_File_Format;
return 0;
}
/* we will now define the routines used to handle */
/* the `/Encoding', `/Subrs', and `/CharStrings' */
/* dictionaries */
static void
parse_font_name( T1_Face face,
T1_Loader loader )
{
T1_Parser parser = &loader->parser;
FT_Error error;
FT_Memory memory = parser->root.memory;
FT_PtrDist len;
FT_Byte* cur;
FT_Byte* cur2;
FT_Byte* limit;
if ( face->type1.font_name )
/* with synthetic fonts, it's possible we get here twice */
return;
T1_Skip_Spaces( parser );
cur = parser->root.cursor;
limit = parser->root.limit;
if ( cur >= limit - 1 || *cur != '/' )
return;
cur++;
cur2 = cur;
while ( cur2 < limit && is_alpha( *cur2 ) )
cur2++;
len = cur2 - cur;
if ( len > 0 )
{
if ( FT_ALLOC( face->type1.font_name, len + 1 ) )
{
parser->root.error = error;
return;
}
FT_MEM_COPY( face->type1.font_name, cur, len );
face->type1.font_name[len] = '\0';
}
parser->root.cursor = cur2;
}
#if 0
static void
parse_font_bbox( T1_Face face,
T1_Loader loader )
{
T1_Parser parser = &loader->parser;
FT_Fixed temp[4];
FT_BBox* bbox = &face->type1.font_bbox;
(void)T1_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] );
}
#endif
static void
parse_font_matrix( T1_Face face,
T1_Loader loader )
{
T1_Parser parser = &loader->parser;
FT_Matrix* matrix = &face->type1.font_matrix;
FT_Vector* offset = &face->type1.font_offset;
FT_Face root = (FT_Face)&face->root;
FT_Fixed temp[6];
FT_Fixed temp_scale;
if ( matrix->xx || matrix->yx )
/* with synthetic fonts, it's possible we get here twice */
return;
(void)T1_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( 1000 * 0x10000L,
temp_scale ) >> 16 );
/* we need to scale the values by 1.0/temp_scale */
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 offsets must be expressed in integer font units */
offset->x = temp[4] >> 16;
offset->y = temp[5] >> 16;
}
static void
parse_encoding( T1_Face face,
T1_Loader loader )
{
T1_Parser parser = &loader->parser;
FT_Byte* cur = parser->root.cursor;
FT_Byte* limit = parser->root.limit;
PSAux_Service psaux = (PSAux_Service)face->psaux;
/* skip whitespace */
while ( is_space( *cur ) )
{
cur++;
if ( cur >= limit )
{
FT_ERROR(( "parse_encoding: out of bounds!\n" ));
parser->root.error = T1_Err_Invalid_File_Format;
return;
}
}
/* if we have a number, then the encoding is an array, */
/* and we must load it now */
if ( (FT_Byte)( *cur - '0' ) < 10 )
{
T1_Encoding encode = &face->type1.encoding;
FT_Int count, n;
PS_Table char_table = &loader->encoding_table;
FT_Memory memory = parser->root.memory;
FT_Error error;
if ( encode->char_index )
/* with synthetic fonts, it's possible we get here twice */
return;
/* read the number of entries in the encoding, should be 256 */
count = (FT_Int)T1_ToInt( parser );
if ( parser->root.error )
return;
/* we use a T1_Table to store our charnames */
loader->num_chars = encode->num_chars = count;
if ( FT_NEW_ARRAY( encode->char_index, count ) ||
FT_NEW_ARRAY( encode->char_name, count ) ||
FT_SET_ERROR( psaux->ps_table_funcs->init(
char_table, count, memory ) ) )
{
parser->root.error = error;
return;
}
/* We need to `zero' out encoding_table.elements */
for ( n = 0; n < count; n++ )
{
char* notdef = (char *)".notdef";
T1_Add_Table( char_table, n, notdef, 8 );
}
/* Now, we will need to read a record of the form */
/* ... charcode /charname ... for each entry in our table */
/* */
/* We simply look for a number followed by an immediate */
/* name. Note that this ignores correctly the sequence */
/* that is often seen in type1 fonts: */
/* */
/* 0 1 255 { 1 index exch /.notdef put } for dup */
/* */
/* used to clean the encoding array before anything else. */
/* */
/* We stop when we encounter a `def'. */
cur = parser->root.cursor;
limit = parser->root.limit;
n = 0;
for ( ; cur < limit; )
{
FT_Byte c;
c = *cur;
/* we stop when we encounter a `def' */
if ( c == 'd' && cur + 3 < limit )
{
if ( cur[1] == 'e' &&
cur[2] == 'f' &&
is_space( cur[-1] ) &&
is_space( cur[3] ) )
{
FT_TRACE6(( "encoding end\n" ));
break;
}
}
/* otherwise, we must find a number before anything else */
if ( (FT_Byte)( c - '0' ) < 10 )
{
FT_Int charcode;
parser->root.cursor = cur;
charcode = (FT_Int)T1_ToInt( parser );
cur = parser->root.cursor;
/* skip whitespace */
while ( cur < limit && is_space( *cur ) )
cur++;
if ( cur < limit && *cur == '/' )
{
/* bingo, we have an immediate name -- it must be a */
/* character name */
FT_Byte* cur2 = cur + 1;
FT_PtrDist len;
while ( cur2 < limit && is_alpha( *cur2 ) )
cur2++;
len = cur2 - cur - 1;
parser->root.error = T1_Add_Table( char_table, charcode,
cur + 1, len + 1 );
char_table->elements[charcode][len] = '\0';
if ( parser->root.error )
return;
cur = cur2;
}
}
else
cur++;
}
face->type1.encoding_type = T1_ENCODING_TYPE_ARRAY;
parser->root.cursor = cur;
}
/* Otherwise, we should have either `StandardEncoding', */
/* `ExpertEncoding', or `ISOLatin1Encoding' */
else
{
if ( cur + 17 < limit &&
ft_strncmp( (const char*)cur, "StandardEncoding", 16 ) == 0 )
face->type1.encoding_type = T1_ENCODING_TYPE_STANDARD;
else if ( cur + 15 < limit &&
ft_strncmp( (const char*)cur, "ExpertEncoding", 14 ) == 0 )
face->type1.encoding_type = T1_ENCODING_TYPE_EXPERT;
else if ( cur + 18 < limit &&
ft_strncmp( (const char*)cur, "ISOLatin1Encoding", 17 ) == 0 )
face->type1.encoding_type = T1_ENCODING_TYPE_ISOLATIN1;
else
{
FT_ERROR(( "parse_encoding: invalid token!\n" ));
parser->root.error = T1_Err_Invalid_File_Format;
}
}
}
static void
parse_subrs( T1_Face face,
T1_Loader loader )
{
T1_Parser parser = &loader->parser;
PS_Table table = &loader->subrs;
FT_Memory memory = parser->root.memory;
FT_Error error;
FT_Int n;
PSAux_Service psaux = (PSAux_Service)face->psaux;
if ( loader->num_subrs )
/* with synthetic fonts, it's possible we get here twice */
return;
loader->num_subrs = (FT_Int)T1_ToInt( parser );
if ( parser->root.error )
return;
/* position the parser right before the `dup' of the first subr */
T1_Skip_Spaces( parser );
T1_Skip_Alpha( parser ); /* `array' */
T1_Skip_Spaces( parser );
/* initialize subrs array */
error = psaux->ps_table_funcs->init( table, loader->num_subrs, memory );
if ( error )
goto Fail;
/* the format is simple: */
/* */
/* `index' + binary data */
/* */
for ( n = 0; n < loader->num_subrs; n++ )
{
FT_Long idx, size;
FT_Byte* base;
/* If the next token isn't `dup', we are also done. This */
/* happens when there are `holes' in the Subrs array. */
if ( ft_strncmp( (char*)parser->root.cursor, "dup", 3 ) != 0 )
break;
idx = T1_ToInt( parser );
if ( !read_binary_data( parser, &size, &base ) )
return;
/* The binary string is followed by one token, e.g. `NP' */
/* (bound to `noaccess put') or by two separate tokens: */
/* `noaccess' & `put'. We position the parser right */
/* before the next `dup', if any. */
T1_Skip_Spaces( parser );
T1_Skip_Alpha( parser ); /* `NP' or `I' or `noaccess' */
T1_Skip_Spaces( parser );
if ( ft_strncmp( (char*)parser->root.cursor, "put", 3 ) == 0 )
{
T1_Skip_Alpha( parser ); /* skip `put' */
T1_Skip_Spaces( parser );
}
/* some fonts use a value of -1 for lenIV to indicate that */
/* the charstrings are unencoded */
/* */
/* thanks to Tom Kacvinsky for pointing this out */
/* */
if ( face->type1.private_dict.lenIV >= 0 )
{
FT_Byte* temp;
/* t1_decrypt() shouldn't write to base -- make temporary copy */
if ( FT_ALLOC( temp, size ) )
goto Fail;
FT_MEM_COPY( temp, base, size );
psaux->t1_decrypt( temp, size, 4330 );
size -= face->type1.private_dict.lenIV;
error = T1_Add_Table( table, idx,
temp + face->type1.private_dict.lenIV, size );
FT_FREE( temp );
}
else
error = T1_Add_Table( table, idx, base, size );
if ( error )
goto Fail;
}
return;
Fail:
parser->root.error = error;
}
static void
parse_charstrings( T1_Face face,
T1_Loader loader )
{
T1_Parser parser = &loader->parser;
PS_Table code_table = &loader->charstrings;
PS_Table name_table = &loader->glyph_names;
PS_Table swap_table = &loader->swap_table;
FT_Memory memory = parser->root.memory;
FT_Error error;
PSAux_Service psaux = (PSAux_Service)face->psaux;
FT_Byte* cur;
FT_Byte* limit = parser->root.limit;
FT_Int n;
FT_UInt notdef_index = 0;
FT_Byte notdef_found = 0;
if ( loader->num_glyphs )
/* with synthetic fonts, it's possible we get here twice */
return;
loader->num_glyphs = (FT_Int)T1_ToInt( parser );
if ( parser->root.error )
return;
/* initialize tables (leaving room for addition of .notdef, */
/* if necessary). */
error = psaux->ps_table_funcs->init( code_table,
loader->num_glyphs + 1,
memory );
if ( error )
goto Fail;
error = psaux->ps_table_funcs->init( name_table,
loader->num_glyphs + 1,
memory );
if ( error )
goto Fail;
/* Initialize table for swapping index notdef_index and */
/* index 0 names and codes (if necessary). */
error = psaux->ps_table_funcs->init( swap_table, 4, memory );
if ( error )
goto Fail;
n = 0;
for (;;)
{
FT_Long size;
FT_Byte* base;
/* the format is simple: */
/* `/glyphname' + binary data */
/* */
/* note that we stop when we find a `def' */
/* */
T1_Skip_Spaces( parser );
cur = parser->root.cursor;
if ( cur >= limit )
break;
/* we stop when we find a `def' or `end' keyword */
if ( *cur == 'd' &&
cur + 3 < limit &&
cur[1] == 'e' &&
cur[2] == 'f' )
break;
if ( *cur == 'e' &&
cur + 3 < limit &&
cur[1] == 'n' &&
cur[2] == 'd' )
break;
if ( *cur != '/' )
T1_Skip_Alpha( parser );
else
{
FT_Byte* cur2 = cur + 1;
FT_PtrDist len;
while ( cur2 < limit && is_alpha( *cur2 ) )
cur2++;
len = cur2 - cur - 1;
error = T1_Add_Table( name_table, n, cur + 1, len + 1 );
if ( error )
goto Fail;
/* add a trailing zero to the name table */
name_table->elements[n][len] = '\0';
/* record index of /.notdef */
if ( ft_strcmp( (const char*)".notdef",
(const char*)(name_table->elements[n]) ) == 0 )
{
notdef_index = n;
notdef_found = 1;
}
parser->root.cursor = cur2;
if ( !read_binary_data( parser, &size, &base ) )
return;
if ( face->type1.private_dict.lenIV >= 0 )
{
FT_Byte* temp;
/* t1_decrypt() shouldn't write to base -- make temporary copy */
if ( FT_ALLOC( temp, size ) )
goto Fail;
FT_MEM_COPY( temp, base, size );
psaux->t1_decrypt( temp, size, 4330 );
size -= face->type1.private_dict.lenIV;
error = T1_Add_Table( code_table, n,
temp + face->type1.private_dict.lenIV, size );
FT_FREE( temp );
}
else
error = T1_Add_Table( code_table, n, base, size );
if ( error )
goto Fail;
n++;
if ( n >= loader->num_glyphs )
break;
}
}
loader->num_glyphs = n;
/* if /.notdef is found but does not occupy index 0, do our magic. */
if ( ft_strcmp( (const char*)".notdef",
(const char*)name_table->elements[0] ) &&
notdef_found )
{
/* Swap glyph in index 0 with /.notdef glyph. First, add index 0 */
/* name and code entries to swap_table. Then place notdef_index name */
/* and code entries into swap_table. Then swap name and code */
/* entries at indices notdef_index and 0 using values stored in */
/* swap_table. */
/* Index 0 name */
error = T1_Add_Table( swap_table, 0,
name_table->elements[0],
name_table->lengths [0] );
if ( error )
goto Fail;
/* Index 0 code */
error = T1_Add_Table( swap_table, 1,
code_table->elements[0],
code_table->lengths [0] );
if ( error )
goto Fail;
/* Index notdef_index name */
error = T1_Add_Table( swap_table, 2,
name_table->elements[notdef_index],
name_table->lengths [notdef_index] );
if ( error )
goto Fail;
/* Index notdef_index code */
error = T1_Add_Table( swap_table, 3,
code_table->elements[notdef_index],
code_table->lengths [notdef_index] );
if ( error )
goto Fail;
error = T1_Add_Table( name_table, notdef_index,
swap_table->elements[0],
swap_table->lengths [0] );
if ( error )
goto Fail;
error = T1_Add_Table( code_table, notdef_index,
swap_table->elements[1],
swap_table->lengths [1] );
if ( error )
goto Fail;
error = T1_Add_Table( name_table, 0,
swap_table->elements[2],
swap_table->lengths [2] );
if ( error )
goto Fail;
error = T1_Add_Table( code_table, 0,
swap_table->elements[3],
swap_table->lengths [3] );
if ( error )
goto Fail;
}
else if ( !notdef_found )
{
/* notdef_index is already 0, or /.notdef is undefined in */
/* charstrings dictionary. Worry about /.notdef undefined. */
/* We take index 0 and add it to the end of the table(s) */
/* and add our own /.notdef glyph to index 0. */
/* 0 333 hsbw endchar */
FT_Byte notdef_glyph[] = {0x8B, 0xF7, 0xE1, 0x0D, 0x0E};
char* notdef_name = (char *)".notdef";
error = T1_Add_Table( swap_table, 0,
name_table->elements[0],
name_table->lengths [0] );
if ( error )
goto Fail;
error = T1_Add_Table( swap_table, 1,
code_table->elements[0],
code_table->lengths [0] );
if ( error )
goto Fail;
error = T1_Add_Table( name_table, 0, notdef_name, 8 );
if ( error )
goto Fail;
error = T1_Add_Table( code_table, 0, notdef_glyph, 5 );
if ( error )
goto Fail;
error = T1_Add_Table( name_table, n,
swap_table->elements[0],
swap_table->lengths [0] );
if ( error )
goto Fail;
error = T1_Add_Table( code_table, n,
swap_table->elements[1],
swap_table->lengths [1] );
if ( error )
goto Fail;
/* we added a glyph. */
loader->num_glyphs = n + 1;
}
return;
Fail:
parser->root.error = error;
}
static
const T1_FieldRec t1_keywords[] =
{
#include "t1tokens.h"
/* now add the special functions... */
T1_FIELD_CALLBACK( "FontName", parse_font_name )
#if 0
T1_FIELD_CALLBACK( "FontBBox", parse_font_bbox )
#endif
T1_FIELD_CALLBACK( "FontMatrix", parse_font_matrix )
T1_FIELD_CALLBACK( "Encoding", parse_encoding )
T1_FIELD_CALLBACK( "Subrs", parse_subrs )
T1_FIELD_CALLBACK( "CharStrings", parse_charstrings )
#ifndef T1_CONFIG_OPTION_NO_MM_SUPPORT
T1_FIELD_CALLBACK( "BlendDesignPositions", parse_blend_design_positions )
T1_FIELD_CALLBACK( "BlendDesignMap", parse_blend_design_map )
T1_FIELD_CALLBACK( "BlendAxisTypes", parse_blend_axis_types )
T1_FIELD_CALLBACK( "WeightVector", parse_weight_vector )
T1_FIELD_CALLBACK( "shareddict", parse_shared_dict )
#endif
{ 0, T1_FIELD_LOCATION_CID_INFO, T1_FIELD_TYPE_NONE, 0, 0, 0, 0, 0 }
};
static FT_Error
parse_dict( T1_Face face,
T1_Loader loader,
FT_Byte* base,
FT_Long size )
{
T1_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 `FontDirectory', which causes problems on some fonts */
if ( *cur == 'F' && cur + 25 < limit &&
ft_strncmp( (char*)cur, "FontDirectory", 13 ) == 0 )
{
FT_Byte* cur2;
/* skip the `FontDirectory' keyword */
cur += 13;
cur2 = cur;
/* lookup the `known' keyword */
while ( cur < limit && *cur != 'k' &&
ft_strncmp( (char*)cur, "known", 5 ) )
cur++;
if ( cur < limit )
{
T1_TokenRec token;
/* skip the `known' keyword and the token following it */
cur += 5;
loader->parser.root.cursor = cur;
T1_ToToken( &loader->parser, &token );
/* if the last token was an array, skip it! */
if ( token.type == T1_TOKEN_TYPE_ARRAY )
cur2 = parser->root.cursor;
}
cur = cur2;
}
/* look for immediates */
else if ( *cur == '/' && cur + 2 < limit )
{
FT_Byte* cur2;
FT_PtrDist 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 */
T1_Field keyword = (T1_Field)t1_keywords;
for (;;)
{
FT_Byte* name;
name = (FT_Byte*)keyword->ident;
if ( !name )
break;
if ( cur[0] == name[0] &&
len == ft_strlen( (const char*)name ) )
{
FT_PtrDist 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;
T1_Skip_Spaces( parser );
parser->root.error = t1_load_keyword( face,
loader,
keyword );
if ( parser->root.error )
return parser->root.error;
cur = parser->root.cursor;
break;
}
}
keyword++;
}
}
}
}
}
}
return parser->root.error;
}
static void
t1_init_loader( T1_Loader loader,
T1_Face face )
{
FT_UNUSED( face );
FT_MEM_ZERO( loader, sizeof ( *loader ) );
loader->num_glyphs = 0;
loader->num_chars = 0;
/* initialize the tables -- simply set their `init' field to 0 */
loader->encoding_table.init = 0;
loader->charstrings.init = 0;
loader->glyph_names.init = 0;
loader->subrs.init = 0;
loader->swap_table.init = 0;
loader->fontdata = 0;
}
static void
t1_done_loader( T1_Loader loader )
{
T1_Parser parser = &loader->parser;
/* finalize tables */
T1_Release_Table( &loader->encoding_table );
T1_Release_Table( &loader->charstrings );
T1_Release_Table( &loader->glyph_names );
T1_Release_Table( &loader->swap_table );
T1_Release_Table( &loader->subrs );
/* finalize parser */
T1_Finalize_Parser( parser );
}
FT_LOCAL_DEF( FT_Error )
T1_Open_Face( T1_Face face )
{
T1_LoaderRec loader;
T1_Parser parser;
T1_Font type1 = &face->type1;
FT_Error error;
PSAux_Service psaux = (PSAux_Service)face->psaux;
t1_init_loader( &loader, face );
/* default lenIV */
type1->private_dict.lenIV = 4;
/* default blue fuzz, we put it there since 0 is a valid value */
type1->private_dict.blue_fuzz = 1;
parser = &loader.parser;
error = T1_New_Parser( parser,
face->root.stream,
face->root.memory,
psaux );
if ( error )
goto Exit;
error = parse_dict( face, &loader, parser->base_dict, parser->base_len );
if ( error )
goto Exit;
error = T1_Get_Private_Dict( parser, psaux );
if ( error )
goto Exit;
error = parse_dict( face, &loader, parser->private_dict,
parser->private_len );
if ( error )
goto Exit;
/* now, propagate the subrs, charstrings, and glyphnames tables */
/* to the Type1 data */
type1->num_glyphs = loader.num_glyphs;
if ( loader.subrs.init )
{
loader.subrs.init = 0;
type1->num_subrs = loader.num_subrs;
type1->subrs_block = loader.subrs.block;
type1->subrs = loader.subrs.elements;
type1->subrs_len = loader.subrs.lengths;
}
#ifdef FT_CONFIG_OPTION_INCREMENTAL
if ( !face->root.internal->incremental_interface )
#endif
if ( !loader.charstrings.init )
{
FT_ERROR(( "T1_Open_Face: no charstrings array in face!\n" ));
error = T1_Err_Invalid_File_Format;
}
loader.charstrings.init = 0;
type1->charstrings_block = loader.charstrings.block;
type1->charstrings = loader.charstrings.elements;
type1->charstrings_len = loader.charstrings.lengths;
/* we copy the glyph names `block' and `elements' fields; */
/* the `lengths' field must be released later */
type1->glyph_names_block = loader.glyph_names.block;
type1->glyph_names = (FT_String**)loader.glyph_names.elements;
loader.glyph_names.block = 0;
loader.glyph_names.elements = 0;
/* we must now build type1.encoding when we have a custom array */
if ( type1->encoding_type == T1_ENCODING_TYPE_ARRAY )
{
FT_Int charcode, idx, min_char, max_char;
FT_Byte* char_name;
FT_Byte* glyph_name;
/* OK, we do the following: for each element in the encoding */
/* table, look up the index of the glyph having the same name */
/* the index is then stored in type1.encoding.char_index, and */
/* a the name to type1.encoding.char_name */
min_char = +32000;
max_char = -32000;
charcode = 0;
for ( ; charcode < loader.encoding_table.max_elems; charcode++ )
{
type1->encoding.char_index[charcode] = 0;
type1->encoding.char_name [charcode] = (char *)".notdef";
char_name = loader.encoding_table.elements[charcode];
if ( char_name )
for ( idx = 0; idx < type1->num_glyphs; idx++ )
{
glyph_name = (FT_Byte*)type1->glyph_names[idx];
if ( ft_strcmp( (const char*)char_name,
(const char*)glyph_name ) == 0 )
{
type1->encoding.char_index[charcode] = (FT_UShort)idx;
type1->encoding.char_name [charcode] = (char*)glyph_name;
/* Change min/max encoded char only if glyph name is */
/* not /.notdef */
if ( ft_strcmp( (const char*)".notdef",
(const char*)glyph_name ) != 0 )
{
if ( charcode < min_char ) min_char = charcode;
if ( charcode > max_char ) max_char = charcode;
}
break;
}
}
}
type1->encoding.code_first = min_char;
type1->encoding.code_last = max_char;
type1->encoding.num_chars = loader.num_chars;
}
Exit:
t1_done_loader( &loader );
return error;
}
/* END */