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freetype2/src/type1z/t1load.c

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/*******************************************************************
*
* t1load.h 2.0
*
* Type1 Loader.
*
* 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.
*
*
* 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 and 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_XXXX
*
* 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 <freetype/internal/ftdebug.h>
#include <freetype/config/ftconfig.h>
#include <freetype/ftmm.h>
#include <freetype/internal/t1types.h>
#include <freetype/internal/t1errors.h>
#include <t1load.h>
#include <stdio.h>
#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 )
{
T1_Blend* blend;
FT_Memory memory = face->root.memory;
FT_Error error = 0;
blend = face->blend;
if (!blend)
{
if ( ALLOC( blend, sizeof(*blend) ) )
goto Exit;
face->blend = blend;
}
/* allocate design data if needed */
if (num_designs > 0)
{
if (blend->num_designs == 0)
{
/* allocate the blend "private" and "font_info" dictionaries */
if ( ALLOC_ARRAY( blend->font_infos[1], num_designs, T1_FontInfo ) ||
ALLOC_ARRAY( blend->privates[1], num_designs, T1_Private ) ||
ALLOC_ARRAY( blend->weight_vector, num_designs*2, FT_Fixed ) )
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->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 ( ALLOC_ARRAY( blend->design_pos[0], num_designs*num_axis, FT_Fixed ) )
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;
}
LOCAL_FUNC FT_Error T1_Get_Multi_Master( T1_Face face,
FT_Multi_Master* master )
{
T1_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;
T1_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;
}
LOCAL_FUNC FT_Error T1_Set_MM_Blend( T1_Face face,
FT_UInt num_coords,
FT_Fixed* coords )
{
T1_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 = 0;
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 = 0;
}
return error;
}
LOCAL_FUNC FT_Error T1_Set_MM_Design( T1_Face face,
FT_UInt num_coords,
FT_Long* coords )
{
T1_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;
T1_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 < 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;
}
LOCAL_FUNC void T1_Done_Blend( T1_Face face )
{
FT_Memory memory = face->root.memory;
T1_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 */
FREE( blend->design_pos[0] );
for ( n = 1; n < num_designs; n++ )
blend->design_pos[n] = 0;
/* release blend "private" and "font info" dictionaries */
FREE( blend->privates[1] );
FREE( blend->font_infos[1] );
for ( n = 0; n < num_designs; n++ )
{
blend->privates [n] = 0;
blend->font_infos[n] = 0;
}
/* release weight vectors */
FREE( blend->weight_vector );
blend->default_weight_vector = 0;
/* release axis names */
for ( n = 0; n < num_axis; n++ )
FREE( blend->axis_names[n] );
/* release design map */
for ( n = 0; n < num_axis; n++ )
{
T1_DesignMap* dmap = blend->design_map + n;
FREE( dmap->design_points );
dmap->num_points = 0;
}
FREE( face->blend );
}
}
static void parse_blend_axis_types( T1_Face face, T1_Loader* loader )
{
T1_Token_Rec axis_tokens[ T1_MAX_MM_AXIS ];
FT_Int n, num_axis;
FT_Error error = 0;
T1_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(( "T1.parse_blend_axis_types: incorrect number of axis: %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_Rec* token = axis_tokens + n;
FT_Byte* name;
FT_Int 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 ( ALLOC( blend->axis_names[n], len+1 ) )
goto Exit;
name = (FT_Byte*)blend->axis_names[n];
MEM_Copy( name, token->start, len );
name[len] = 0;
}
Exit:
loader->parser.error = error;
}
static void parse_blend_design_positions( T1_Face face, T1_Loader* loader )
{
T1_Token_Rec design_tokens[ T1_MAX_MM_DESIGNS ];
FT_Int num_designs;
FT_Int num_axis;
T1_Parser* parser = &loader->parser;
FT_Error error = 0;
T1_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(( "T1.design positions: incorrect number of designs: %d\n",
num_designs ));
error = T1_Err_Invalid_File_Format;
goto Exit;
}
{
FT_Byte* old_cursor = parser->cursor;
FT_Byte* old_limit = parser->limit;
FT_UInt n;
blend = face->blend;
num_axis = 0; /* make compiler happy */
for ( n = 0; n < (FT_UInt)num_designs; n++ )
{
T1_Token_Rec axis_tokens[ T1_MAX_MM_DESIGNS ];
T1_Token_Rec* token;
FT_Int axis, n_axis;
/* read axis/coordinates tokens */
token = design_tokens + n;
parser->cursor = token->start - 1;
parser->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(( "T1.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_Rec* token2 = axis_tokens + axis;
parser->cursor = token2->start;
parser->limit = token2->limit;
blend->design_pos[n][axis] = T1_ToFixed( parser, 0 );
}
}
loader->parser.cursor = old_cursor;
loader->parser.limit = old_limit;
}
Exit:
loader->parser.error = error;
}
static void parse_blend_design_map( T1_Face face, T1_Loader* loader )
{
FT_Error error = 0;
T1_Parser* parser = &loader->parser;
T1_Blend* blend;
T1_Token_Rec 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(( "T1.design map: incorrect number of axis: %d\n",
num_axis ));
error = T1_Err_Invalid_File_Format;
goto Exit;
}
old_cursor = parser->cursor;
old_limit = parser->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++ )
{
T1_DesignMap* map = blend->design_map + n;
T1_Token_Rec* token;
FT_Int p, num_points;
token = axis_tokens + n;
parser->cursor = token->start;
parser->limit = token->limit;
/* count the number of map points */
{
FT_Byte* p = token->start;
FT_Byte* limit = token->limit;
num_points = 0;
for ( ; p < limit; p++ )
if (p[0] == '[')
num_points++;
}
if (num_points <= 0 || num_points > T1_MAX_MM_MAP_POINTS)
{
FT_ERROR(( "T1.design map: incorrect table\n" ));
error = T1_Err_Invalid_File_Format;
goto Exit;
}
/* allocate design map data */
if ( ALLOC_ARRAY( map->design_points, num_points*2, FT_Fixed ) )
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->cursor = old_cursor;
parser->limit = old_limit;
Exit:
parser->error = error;
}
static void parse_weight_vector( T1_Face face, T1_Loader* loader )
{
FT_Error error = 0;
T1_Parser* parser = &loader->parser;
T1_Blend* blend = face->blend;
T1_Token_Rec master;
FT_UInt n;
FT_Byte* old_cursor;
FT_Byte* old_limit;
if (!blend || blend->num_designs == 0)
{
FT_ERROR(( "t1.weight_vector: too early !!\n" ));
error = T1_Err_Invalid_File_Format;
goto Exit;
}
T1_ToToken( parser, &master );
if (master.type != t1_token_array)
{
FT_ERROR(( "t1.weight_vector: incorrect format !!\n" ));
error = T1_Err_Invalid_File_Format;
goto Exit;
}
old_cursor = parser->cursor;
old_limit = parser->limit;
parser->cursor = master.start;
parser->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->cursor = old_cursor;
parser->limit = old_limit;
Exit:
parser->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;
UNUSED(face);
parser->cursor = parser->limit;
parser->error = 0;
}
#endif
/***************************************************************************/
/***************************************************************************/
/***** *****/
/***** TYPE 1 SYMBOL PARSING *****/
/***** *****/
/***************************************************************************/
/***************************************************************************/
/*********************************************************************
*
* First of all, define the token field static variables. This is
* a set of T1_Field_Rec variables used later..
*
*********************************************************************/
#define T1_NEW_STRING( _name, _field ) \
static const T1_Field_Rec t1_field_ ## _field = T1_FIELD_STRING( T1TYPE, _field );
#define T1_NEW_BOOL( _name, _field ) \
static const T1_Field_Rec t1_field_ ## _field = T1_FIELD_BOOL( T1TYPE, _field );
#define T1_NEW_NUM( _name, _field ) \
static const T1_Field_Rec t1_field_ ## _field = T1_FIELD_NUM( T1TYPE, _field );
#define T1_NEW_FIXED( _name, _field ) \
static const T1_Field_Rec t1_field_ ## _field = T1_FIELD_FIXED( T1TYPE, _field, _power );
#define T1_NEW_NUM_TABLE( _name, _field, _max, _count ) \
static const T1_Field_Rec t1_field_ ## _field = T1_FIELD_NUM_ARRAY( T1TYPE, _field, _count, _max );
#define T1_NEW_FIXED_TABLE( _name, _field, _max, _count ) \
static const T1_Field_Rec t1_field_ ## _field = T1_FIELD_FIXED_ARRAY( T1TYPE, _field, _count, _max );
#define T1_NEW_NUM_TABLE2( _name, _field, _max ) \
static const T1_Field_Rec t1_field_ ## _field = T1_FIELD_NUM_ARRAY2( T1TYPE, _field, _max );
#define T1_NEW_FIXED_TABLE2( _name, _field, _max ) \
static const T1_Field_Rec t1_field_ ## _field = T1_FIELD_FIXED_ARRAY2( T1TYPE, _field, _max );
#define T1_FONTINFO_STRING(n,f) T1_NEW_STRING(n,f)
#define T1_FONTINFO_NUM(n,f) T1_NEW_NUM(n,f)
#define T1_FONTINFO_BOOL(n,f) T1_NEW_BOOL(n,f)
#define T1_PRIVATE_NUM(n,f) T1_NEW_NUM(n,f)
#define T1_PRIVATE_FIXED(n,f) T1_NEW_FIXED(n,f)
#define T1_PRIVATE_NUM_TABLE(n,f,m,c) T1_NEW_NUM_TABLE(n,f,m,c)
#define T1_PRIVATE_NUM_TABLE2(n,f,m) T1_NEW_NUM_TABLE2(n,f,m)
#define T1_TOPDICT_NUM(n,f) T1_NEW_NUM(n,f)
#define T1_TOPDICT_NUM_FIXED2(n,f,m) T1_NEW_FIXED_TABLE2(n,f,m)
/* including this file defines all field variables */
#include <t1tokens.h>
/*********************************************************************
*
* Second, define the keyword variables. This is a set of T1_KeyWord
* structures used to model the way each keyword is "loaded"..
*
*********************************************************************/
typedef void (*T1_Parse_Func)( T1_Face face, T1_Loader* loader );
typedef enum T1_KeyWord_Type_
{
t1_keyword_callback = 0,
t1_keyword_field,
t1_keyword_field_table
} T1_KeyWord_Type;
typedef enum T1_KeyWord_Location_
{
t1_keyword_type1 = 0,
t1_keyword_font_info,
t1_keyword_private
} T1_KeyWord_Location;
typedef struct T1_KeyWord_
{
const char* name;
T1_KeyWord_Type type;
T1_KeyWord_Location location;
T1_Parse_Func parsing;
const T1_Field_Rec* field;
} T1_KeyWord;
#define T1_KEYWORD_CALLBACK( name, callback ) \
{ name, t1_keyword_callback, t1_keyword_type1, callback, 0 }
#define T1_KEYWORD_TYPE1( name, f ) \
{ name, t1_keyword_field, t1_keyword_type1, 0, &t1_field_ ## f }
#define T1_KEYWORD_FONTINFO( name, f ) \
{ name, t1_keyword_field, t1_keyword_font_info, 0, &t1_field_ ## f }
#define T1_KEYWORD_PRIVATE( name, f ) \
{ name, t1_keyword_field, t1_keyword_private, 0, &t1_field_ ## f }
#define T1_KEYWORD_FONTINFO_TABLE( name, f ) \
{ name, t1_keyword_field_table, t1_keyword_font_info, 0, &t1_field_ ## f }
#define T1_KEYWORD_PRIVATE_TABLE( name, f ) \
{ name, t1_keyword_field_table, t1_keyword_private, 0, &t1_field_ ## f }
#undef T1_FONTINFO_STRING
#undef T1_FONTINFO_NUM
#undef T1_FONTINFO_BOOL
#undef T1_PRIVATE_NUM
#undef T1_PRIVATE_FIXED
#undef T1_PRIVATE_NUM_TABLE
#undef T1_PRIVATE_NUM_TABLE2
#undef T1_TOPDICT_NUM
#undef T1_TOPDICT_NUM_FIXED2
#define T1_FONTINFO_STRING(n,f) T1_KEYWORD_FONTINFO(n,f),
#define T1_FONTINFO_NUM(n,f) T1_KEYWORD_FONTINFO(n,f),
#define T1_FONTINFO_BOOL(n,f) T1_KEYWORD_FONTINFO(n,f),
#define T1_PRIVATE_NUM(n,f) T1_KEYWORD_PRIVATE(n,f),
#define T1_PRIVATE_FIXED(n,f) T1_KEYWORD_PRIVATE(n,f),
#define T1_PRIVATE_NUM_TABLE(n,f,m,c) T1_KEYWORD_PRIVATE_TABLE(n,f),
#define T1_PRIVATE_NUM_TABLE2(n,f,m) T1_KEYWORD_PRIVATE_TABLE(n,f),
#define T1_TOPDICT_NUM(n,f) T1_KEYWORD_TYPE1(n,f),
#define T1_TOPDICT_NUM_FIXED2(n,f,m) T1_KEYWORD_TYPE1(n,f),
static FT_Error t1_load_keyword( T1_Face face,
T1_Loader* loader,
T1_KeyWord* keyword )
{
FT_Error error;
void* dummy_object;
void** objects;
FT_UInt max_objects;
T1_Blend* blend = face->blend;
/* if the keyword has a dedicated callback, call it */
if (keyword->type == t1_keyword_callback)
{
keyword->parsing( face, loader );
error = loader->parser.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 (keyword->location)
{
case t1_keyword_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_keyword_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;
default:
dummy_object = &face->type1;
objects = &dummy_object;
max_objects = 0;
}
if (keyword->type == t1_keyword_field_table)
error = T1_Load_Field_Table( &loader->parser, keyword->field, objects, max_objects, 0 );
else
error = T1_Load_Field( &loader->parser, keyword->field, objects, max_objects, 0 );
Exit:
return error;
}
static
int is_space( char c )
{
return ( c == ' ' || c == '\t' || c == '\r' || c == '\n' );
}
static
int is_alpha( char c )
{
return ( (c >= 'A' && c <= 'Z') ||
(c >= 'a' && c <= 'z') ||
(c >= '0' && c <= '9') ||
(c == '.') ||
(c == '_') );
}
static
void skip_whitespace( T1_Parser* parser )
{
FT_Byte* cur = parser->cursor;
while ( cur < parser->limit && is_space(*cur) )
cur++;
parser->cursor = cur;
}
static
void skip_blackspace( T1_Parser* parser )
{
FT_Byte* cur = parser->cursor;
while ( cur < parser->limit && !is_space(*cur) )
cur++;
parser->cursor = cur;
}
static
int read_binary_data( T1_Parser* parser, FT_Int *size, FT_Byte* *base )
{
FT_Byte* cur;
FT_Byte* limit = parser->limit;
/* the binary data has the following format */
/* */
/* "size" [white*] RD white ....... ND */
/* */
skip_whitespace(parser);
cur = parser->cursor;
if ( cur < limit && (FT_Byte)(*cur-'0') < 10 )
{
*size = T1_ToInt(parser);
skip_whitespace(parser);
skip_blackspace(parser); /* "RD" or "-|" or something else */
/* there is only one whitespace char after the */
/* "RD" or "-|" token */
*base = parser->cursor + 1;
parser->cursor += *size+1;
return 1;
}
FT_ERROR(( "type1.read_binary_data: invalid size field\n" ));
parser->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->memory;
FT_Int len;
FT_Byte* cur;
FT_Byte* cur2;
FT_Byte* limit;
skip_whitespace(parser);
cur = parser->cursor;
limit = parser->limit;
if ( cur >= limit-1 || *cur != '/' ) return;
cur++;
cur2 = cur;
while (cur2 < limit && is_alpha(*cur2)) cur2++;
len = cur2-cur;
if (len > 0)
{
if ( ALLOC( face->type1.font_name, len+1 ) )
{
parser->error = error;
return;
}
MEM_Copy( face->type1.font_name, cur, len );
face->type1.font_name[len] = '\0';
}
parser->cursor = cur2;
}
static
void parse_font_bbox( T1_Face face, T1_Loader* loader )
{
T1_Parser* parser = &loader->parser;
FT_Short temp[4];
FT_BBox* bbox = &face->type1.font_bbox;
(void)T1_ToCoordArray( parser, 4, temp );
bbox->xMin = temp[0];
bbox->yMin = temp[1];
bbox->xMax = temp[2];
bbox->yMax = temp[3];
}
static
void parse_font_matrix( T1_Face face, T1_Loader* loader )
{
T1_Parser* parser = &loader->parser;
FT_Matrix* matrix = &face->type1.font_matrix;
FT_Fixed temp[4];
(void)T1_ToFixedArray( parser, 4, temp, 3 );
matrix->xx = temp[0];
matrix->yx = temp[1];
matrix->xy = temp[2];
matrix->yy = temp[3];
}
static
void parse_encoding( T1_Face face, T1_Loader* loader )
{
T1_Parser* parser = &loader->parser;
FT_Byte* cur = parser->cursor;
FT_Byte* limit = parser->limit;
/* skip whitespace */
while (is_space(*cur))
{
cur++;
if (cur >= limit)
{
FT_ERROR(( "type1.parse_encoding: out of bounds !!\n" ));
parser->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;
T1_Table* char_table = &loader->encoding_table;
FT_Memory memory = parser->memory;
FT_Error error;
/* read the number of entries in the encoding, should be 256 */
count = T1_ToInt( parser );
if (parser->error) return;
/* we use a T1_Table to store our charnames */
encode->num_chars = count;
if ( ALLOC_ARRAY( encode->char_index, count, FT_Short ) ||
ALLOC_ARRAY( encode->char_name, count, FT_String* ) ||
(error = T1_New_Table( char_table, count, memory )) != 0 )
{
parser->error = error;
return;
}
/* 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->cursor;
limit = parser->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->cursor = cur;
charcode = T1_ToInt(parser);
cur = parser->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_Int len;
while (cur2 < limit && is_alpha(*cur2)) cur2++;
len = cur2-cur-1;
parser->error = T1_Add_Table( char_table, charcode, cur+1, len+1 );
char_table->elements[charcode][len] = '\0';
if (parser->error) return;
cur = cur2;
}
}
else
cur++;
}
face->type1.encoding_type = t1_encoding_array;
parser->cursor = cur;
}
/* Otherwise, we should have either "StandardEncoding" or */
/* "ExpertEncoding" */
else
{
if ( cur+17 < limit &&
strncmp( (const char*)cur, "StandardEncoding", 16 ) == 0 )
face->type1.encoding_type = t1_encoding_standard;
else if ( cur+15 < limit &&
strncmp( (const char*)cur, "ExpertEncoding", 14 ) == 0 )
face->type1.encoding_type = t1_encoding_expert;
else
{
FT_ERROR(( "type1.parse_encoding: invalid token !!\n" ));
parser->error = T1_Err_Invalid_File_Format;
}
}
}
static
void parse_subrs( T1_Face face, T1_Loader* loader )
{
T1_Parser* parser = &loader->parser;
T1_Table* table = &loader->subrs;
FT_Memory memory = parser->memory;
FT_Error error;
FT_Int n;
loader->num_subrs = T1_ToInt( parser );
if (parser->error) return;
/* initialise subrs array */
error = T1_New_Table( 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_Int index, size;
FT_Byte* base;
index = T1_ToInt(parser);
if (!read_binary_data(parser,&size,&base)) return;
T1_Decrypt( base, size, 4330 );
size -= face->type1.private_dict.lenIV;
base += face->type1.private_dict.lenIV;
error = T1_Add_Table( table, index, base, size );
if (error) goto Fail;
}
return;
Fail:
parser->error = error;
}
static
void parse_charstrings( T1_Face face, T1_Loader* loader )
{
T1_Parser* parser = &loader->parser;
T1_Table* code_table = &loader->charstrings;
T1_Table* name_table = &loader->glyph_names;
FT_Memory memory = parser->memory;
FT_Error error;
FT_Byte* cur;
FT_Byte* limit = parser->limit;
FT_Int n;
loader->num_glyphs = T1_ToInt( parser );
if (parser->error) return;
/* initialise tables */
error = T1_New_Table( code_table, loader->num_glyphs, memory ) ||
T1_New_Table( name_table, loader->num_glyphs, memory );
if (error) goto Fail;
n = 0;
for ( ;; )
{
FT_Int size;
FT_Byte* base;
/* the format is simple : */
/* "/glyphname" + binary data */
/* */
/* note that we stop when we find a "def" */
/* */
skip_whitespace(parser);
cur = parser->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 != '/')
skip_blackspace(parser);
else
{
FT_Byte* cur2 = cur+1;
FT_Int 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';
parser->cursor = cur2;
if (!read_binary_data(parser,&size,&base)) return;
T1_Decrypt( base, size, 4330 );
size -= face->type1.private_dict.lenIV;
base += face->type1.private_dict.lenIV;
error = T1_Add_Table( code_table, n, base, size );
if (error) goto Fail;
n++;
if (n >= loader->num_glyphs)
break;
}
}
loader->num_glyphs = n;
return;
Fail:
parser->error = error;
}
static
const T1_KeyWord t1_keywords[] =
{
#include <t1tokens.h>
/* now add the special functions... */
T1_KEYWORD_CALLBACK( "FontName", parse_font_name ),
T1_KEYWORD_CALLBACK( "FontBBox", parse_font_bbox ),
T1_KEYWORD_CALLBACK( "FontMatrix", parse_font_matrix ),
T1_KEYWORD_CALLBACK( "Encoding", parse_encoding ),
T1_KEYWORD_CALLBACK( "Subrs", parse_subrs ),
T1_KEYWORD_CALLBACK( "CharStrings", parse_charstrings ),
#ifndef T1_CONFIG_OPTION_NO_MM_SUPPORT
T1_KEYWORD_CALLBACK( "BlendDesignPositions", parse_blend_design_positions ),
T1_KEYWORD_CALLBACK( "BlendDesignMap", parse_blend_design_map ),
T1_KEYWORD_CALLBACK( "BlendAxisTypes", parse_blend_axis_types ),
T1_KEYWORD_CALLBACK( "WeightVector", parse_weight_vector ),
T1_KEYWORD_CALLBACK( "shareddict", parse_shared_dict ),
#endif
T1_KEYWORD_CALLBACK( 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->cursor = base;
parser->limit = base + size;
parser->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 &&
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' && strncmp( (char*)cur, "known", 5 ) )
cur++;
if (cur < limit)
{
T1_Token_Rec token;
/* skip the "known" keyword and the token following it */
cur += 5;
loader->parser.cursor = cur;
T1_ToToken( &loader->parser, &token );
/* if the last token was an array, skip it !! */
if (token.type == t1_token_array)
cur2 = parser->cursor;
}
cur = cur2;
}
/* 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)
{
if (!loader->fontdata)
{
if ( strncmp( (char*)cur, "FontInfo", 8 ) == 0 )
loader->fontdata = 1;
}
else
{
/* now, compare the immediate name to the keyword table */
T1_KeyWord* keyword = (T1_KeyWord*)t1_keywords;
for (;;)
{
FT_Byte* name;
name = (FT_Byte*)keyword->name;
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 = t1_load_keyword( face, loader, keyword );
if (parser->error)
return parser->error;
cur = parser->cursor;
break;
}
}
keyword++;
}
}
}
}
}
}
return parser->error;
}
static
void t1_init_loader( T1_Loader* loader, T1_Face face )
{
UNUSED(face);
MEM_Set( loader, 0, 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->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->subrs );
/* finalize parser */
T1_Done_Parser( parser );
}
LOCAL_FUNC
FT_Error T1_Open_Face( T1_Face face )
{
T1_Loader loader;
T1_Parser* parser;
T1_Font* type1 = &face->type1;
FT_Error error;
t1_init_loader( &loader, face );
/* default lenIV */
type1->private_dict.lenIV = 4;
parser = &loader.parser;
error = T1_New_Parser( parser, face->root.stream, face->root.memory );
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 );
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 )
{
FT_ERROR(( "T1.Open_Face: no subrs array in face !!\n" ));
error = T1_Err_Invalid_File_Format;
}
if ( !loader.charstrings.init )
{
FT_ERROR(( "T1.Open_Face: no charstrings array in face !!\n" ));
error = T1_Err_Invalid_File_Format;
}
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;
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 */
/* but 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_array )
{
FT_Int charcode, index, min_char, max_char;
FT_Byte* char_name;
FT_Byte* glyph_name;
/* OK, we do the following : for each element in the encoding */
/* table, lookup 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.num_elems; charcode++ )
{
type1->encoding.char_index[charcode] = 0;
type1->encoding.char_name [charcode] = ".notdef";
char_name = loader.encoding_table.elements[charcode];
if (char_name)
for ( index = 0; index < type1->num_glyphs; index++ )
{
glyph_name = (FT_Byte*)type1->glyph_names[index];
if ( strcmp( (const char*)char_name,
(const char*)glyph_name ) == 0 )
{
type1->encoding.char_index[charcode] = index;
type1->encoding.char_name [charcode] = (char*)glyph_name;
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;
}
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