ref: 87e4b339a3782f1e5dd230e4cdcd393441fc4891
dir: /src/psaux/afmparse.c/
/***************************************************************************/
/* */
/* afmparse.c */
/* */
/* AFM parser (body). */
/* */
/* Copyright 2006 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_FREETYPE_H
#include FT_INTERNAL_POSTSCRIPT_AUX_H
#include FT_INTERNAL_DEBUG_H
#include "afmparse.h"
#include "psconv.h"
#include "psauxerr.h"
/***************************************************************************/
/* */
/* AFM_Stream */
/* */
/* The use of AFM_Stream is largely inspired by parseAFM.[ch] from t1lib. */
/* */
/* */
enum
{
AFM_STREAM_STATUS_NORMAL,
AFM_STREAM_STATUS_EOC,
AFM_STREAM_STATUS_EOL,
AFM_STREAM_STATUS_EOF
};
typedef struct AFM_StreamRec_
{
FT_Byte* cursor;
FT_Byte* base;
FT_Byte* limit;
FT_Int status;
} AFM_StreamRec;
#ifndef EOF
#define EOF -1
#endif
/* this works because empty lines are ignored */
#define AFM_IS_NEWLINE( ch ) ( (ch) == '\r' || (ch) == '\n' )
#define AFM_IS_EOF( ch ) ( (ch) == EOF || (ch) == '\x1a' )
#define AFM_IS_SPACE( ch ) ( (ch) == ' ' || (ch) == '\t' )
/* column separator; there is no `column' in the spec actually */
#define AFM_IS_SEP( ch ) ( (ch) == ';' )
#define AFM_GETC() \
( ( (stream)->cursor < (stream)->limit ) ? *(stream)->cursor++ \
: EOF )
#define AFM_STREAM_KEY_BEGIN( stream ) \
(char*)( (stream)->cursor - 1 )
#define AFM_STREAM_KEY_LEN( stream, key ) \
( (char*)(stream)->cursor - key - 1 )
#define AFM_STATUS_EOC( stream ) \
( (stream)->status >= AFM_STREAM_STATUS_EOC )
#define AFM_STATUS_EOL( stream ) \
( (stream)->status >= AFM_STREAM_STATUS_EOL )
#define AFM_STATUS_EOF( stream ) \
( (stream)->status >= AFM_STREAM_STATUS_EOF )
static int
afm_stream_skip_spaces( AFM_Stream stream )
{
int ch = 0; /* make stupid compiler happy */
if ( AFM_STATUS_EOC( stream ) )
return ';';
while ( 1 )
{
ch = AFM_GETC();
if ( !AFM_IS_SPACE( ch ) )
break;
}
if ( AFM_IS_NEWLINE( ch ) )
stream->status = AFM_STREAM_STATUS_EOL;
else if ( AFM_IS_SEP( ch ) )
stream->status = AFM_STREAM_STATUS_EOC;
else if ( AFM_IS_EOF( ch ) )
stream->status = AFM_STREAM_STATUS_EOF;
return ch;
}
/* read a key or value in current column */
static char*
afm_stream_read_one( AFM_Stream stream )
{
char* str;
int ch;
afm_stream_skip_spaces( stream );
if ( AFM_STATUS_EOC( stream ) )
return NULL;
str = AFM_STREAM_KEY_BEGIN( stream );
while ( 1 )
{
ch = AFM_GETC();
if ( AFM_IS_SPACE( ch ) )
break;
else if ( AFM_IS_NEWLINE( ch ) )
{
stream->status = AFM_STREAM_STATUS_EOL;
break;
}
else if ( AFM_IS_SEP( ch ) )
{
stream->status = AFM_STREAM_STATUS_EOC;
break;
}
else if ( AFM_IS_EOF( ch ) )
{
stream->status = AFM_STREAM_STATUS_EOF;
break;
}
}
return str;
}
/* read a string (i.e., read to EOL) */
static char*
afm_stream_read_string( AFM_Stream stream )
{
char* str;
int ch;
afm_stream_skip_spaces( stream );
if ( AFM_STATUS_EOL( stream ) )
return NULL;
str = AFM_STREAM_KEY_BEGIN( stream );
/* scan to eol */
while ( 1 )
{
ch = AFM_GETC();
if ( AFM_IS_NEWLINE( ch ) )
{
stream->status = AFM_STREAM_STATUS_EOL;
break;
}
else if ( AFM_IS_EOF( ch ) )
{
stream->status = AFM_STREAM_STATUS_EOF;
break;
}
}
return str;
}
/*************************************************************************/
/* */
/* AFM_Parser */
/* */
/* */
/* all keys defined in Ch. 7-10 of 5004.AFM_Spec.pdf */
typedef enum AFM_Token_
{
AFM_TOKEN_ASCENDER,
AFM_TOKEN_AXISLABEL,
AFM_TOKEN_AXISTYPE,
AFM_TOKEN_B,
AFM_TOKEN_BLENDAXISTYPES,
AFM_TOKEN_BLENDDESIGNMAP,
AFM_TOKEN_BLENDDESIGNPOSITIONS,
AFM_TOKEN_C,
AFM_TOKEN_CC,
AFM_TOKEN_CH,
AFM_TOKEN_CAPHEIGHT,
AFM_TOKEN_CHARWIDTH,
AFM_TOKEN_CHARACTERSET,
AFM_TOKEN_CHARACTERS,
AFM_TOKEN_DESCENDER,
AFM_TOKEN_ENCODINGSCHEME,
AFM_TOKEN_ENDAXIS,
AFM_TOKEN_ENDCHARMETRICS,
AFM_TOKEN_ENDCOMPOSITES,
AFM_TOKEN_ENDDIRECTION,
AFM_TOKEN_ENDFONTMETRICS,
AFM_TOKEN_ENDKERNDATA,
AFM_TOKEN_ENDKERNPAIRS,
AFM_TOKEN_ENDTRACKKERN,
AFM_TOKEN_ESCCHAR,
AFM_TOKEN_FAMILYNAME,
AFM_TOKEN_FONTBBOX,
AFM_TOKEN_FONTNAME,
AFM_TOKEN_FULLNAME,
AFM_TOKEN_ISBASEFONT,
AFM_TOKEN_ISCIDFONT,
AFM_TOKEN_ISFIXEDPITCH,
AFM_TOKEN_ISFIXEDV,
AFM_TOKEN_ITALICANGLE,
AFM_TOKEN_KP,
AFM_TOKEN_KPH,
AFM_TOKEN_KPX,
AFM_TOKEN_KPY,
AFM_TOKEN_L,
AFM_TOKEN_MAPPINGSCHEME,
AFM_TOKEN_METRICSSETS,
AFM_TOKEN_N,
AFM_TOKEN_NOTICE,
AFM_TOKEN_PCC,
AFM_TOKEN_STARTAXIS,
AFM_TOKEN_STARTCHARMETRICS,
AFM_TOKEN_STARTCOMPOSITES,
AFM_TOKEN_STARTDIRECTION,
AFM_TOKEN_STARTFONTMETRICS,
AFM_TOKEN_STARTKERNDATA,
AFM_TOKEN_STARTKERNPAIRS,
AFM_TOKEN_STARTKERNPAIRS0,
AFM_TOKEN_STARTKERNPAIRS1,
AFM_TOKEN_STARTTRACKKERN,
AFM_TOKEN_STDHW,
AFM_TOKEN_STDVW,
AFM_TOKEN_TRACKKERN,
AFM_TOKEN_UNDERLINEPOSITION,
AFM_TOKEN_UNDERLINETHICKNESS,
AFM_TOKEN_VV,
AFM_TOKEN_VVECTOR,
AFM_TOKEN_VERSION,
AFM_TOKEN_W,
AFM_TOKEN_W0,
AFM_TOKEN_W0X,
AFM_TOKEN_W0Y,
AFM_TOKEN_W1,
AFM_TOKEN_W1X,
AFM_TOKEN_W1Y,
AFM_TOKEN_WX,
AFM_TOKEN_WY,
AFM_TOKEN_WEIGHT,
AFM_TOKEN_WEIGHTVECTOR,
AFM_TOKEN_XHEIGHT,
N_AFM_TOKENS,
AFM_TOKEN_UNKNOWN
} AFM_Token;
static const char* const afm_key_table[N_AFM_TOKENS] =
{
"Ascender",
"AxisLabel",
"AxisType",
"B",
"BlendAxisTypes",
"BlendDesignMap",
"BlendDesignPositions",
"C",
"CC",
"CH",
"CapHeight",
"CharWidth",
"CharacterSet",
"Characters",
"Descender",
"EncodingScheme",
"EndAxis",
"EndCharMetrics",
"EndComposites",
"EndDirection",
"EndFontMetrics",
"EndKernData",
"EndKernPairs",
"EndTrackKern",
"EscChar",
"FamilyName",
"FontBBox",
"FontName",
"FullName",
"IsBaseFont",
"IsCIDFont",
"IsFixedPitch",
"IsFixedV",
"ItalicAngle",
"KP",
"KPH",
"KPX",
"KPY",
"L",
"MappingScheme",
"MetricsSets",
"N",
"Notice",
"PCC",
"StartAxis",
"StartCharMetrics",
"StartComposites",
"StartDirection",
"StartFontMetrics",
"StartKernData",
"StartKernPairs",
"StartKernPairs0",
"StartKernPairs1",
"StartTrackKern",
"StdHW",
"StdVW",
"TrackKern",
"UnderlinePosition",
"UnderlineThickness",
"VV",
"VVector",
"Version",
"W",
"W0",
"W0X",
"W0Y",
"W1",
"W1X",
"W1Y",
"WX",
"WY",
"Weight",
"WeightVector",
"XHeight"
};
/*
* `afm_parser_read_vals' and `afm_parser_next_key' provide
* high-level operations to an AFM_Stream. The rest of the
* parser functions should use them without accessing the
* AFM_Stream directly.
*/
FT_LOCAL_DEF( FT_Int )
afm_parser_read_vals( AFM_Parser parser,
AFM_Value vals,
FT_Int n )
{
AFM_Stream stream = parser->stream;
char* str;
FT_Int i;
if ( n > AFM_MAX_ARGUMENTS )
return 0;
for ( i = 0; i < n; i++ )
{
FT_UInt len;
AFM_Value val = vals + i;
if ( val->type == AFM_VALUE_TYPE_STRING )
str = afm_stream_read_string( stream );
else
str = afm_stream_read_one( stream );
if ( !str )
break;
len = AFM_STREAM_KEY_LEN( stream, str );
switch ( val->type )
{
case AFM_VALUE_TYPE_STRING:
case AFM_VALUE_TYPE_NAME:
{
FT_Memory memory = parser->memory;
FT_Error error;
if ( !FT_QALLOC( val->u.s, len + 1 ) )
{
ft_memcpy( val->u.s, str, len );
val->u.s[len] = '\0';
}
}
break;
case AFM_VALUE_TYPE_FIXED:
val->u.f = PS_Conv_ToFixed( (FT_Byte**)(void*)&str,
(FT_Byte*)str + len, 0 );
break;
case AFM_VALUE_TYPE_INTEGER:
val->u.i = PS_Conv_ToInt( (FT_Byte**)(void*)&str,
(FT_Byte*)str + len );
break;
case AFM_VALUE_TYPE_BOOL:
val->u.b = FT_BOOL( len == 4 &&
!ft_strncmp( str, "true", 4 ) );
break;
case AFM_VALUE_TYPE_INDEX:
if ( parser->get_index )
val->u.i = parser->get_index( str, len, parser->user_data );
else
val->u.i = 0;
break;
}
}
return i;
}
FT_LOCAL_DEF( char* )
afm_parser_next_key( AFM_Parser parser,
FT_Bool line,
FT_UInt* len )
{
AFM_Stream stream = parser->stream;
char* key = 0; /* make stupid compiler happy */
if ( line )
{
while ( 1 )
{
/* skip current line */
if ( !AFM_STATUS_EOL( stream ) )
afm_stream_read_string( stream );
stream->status = AFM_STREAM_STATUS_NORMAL;
key = afm_stream_read_one( stream );
/* skip empty line */
if ( !key &&
!AFM_STATUS_EOF( stream ) &&
AFM_STATUS_EOL( stream ) )
continue;
break;
}
}
else
{
while ( 1 )
{
/* skip current column */
while ( !AFM_STATUS_EOC( stream ) )
afm_stream_read_one( stream );
stream->status = AFM_STREAM_STATUS_NORMAL;
key = afm_stream_read_one( stream );
/* skip empty column */
if ( !key &&
!AFM_STATUS_EOF( stream ) &&
AFM_STATUS_EOC( stream ) )
continue;
break;
}
}
if ( len )
*len = ( key ) ? AFM_STREAM_KEY_LEN( stream, key )
: 0;
return key;
}
static AFM_Token
afm_tokenize( const char* key,
FT_UInt len )
{
int n;
for ( n = 0; n < N_AFM_TOKENS; n++ )
{
if ( *( afm_key_table[n] ) == *key )
{
for ( ; n < N_AFM_TOKENS; n++ )
{
if ( *( afm_key_table[n] ) != *key )
return AFM_TOKEN_UNKNOWN;
if ( ft_strncmp( afm_key_table[n], key, len ) == 0 )
return (AFM_Token) n;
}
}
}
return AFM_TOKEN_UNKNOWN;
}
FT_LOCAL_DEF( FT_Error )
afm_parser_init( AFM_Parser parser,
FT_Memory memory,
FT_Byte* base,
FT_Byte* limit )
{
AFM_Stream stream;
FT_Error error;
if ( FT_NEW( stream ) )
return error;
stream->cursor = stream->base = base;
stream->limit = limit;
/* don't skip the first line during the first call */
stream->status = AFM_STREAM_STATUS_EOL;
parser->memory = memory;
parser->stream = stream;
parser->FontInfo = NULL;
parser->get_index = NULL;
return PSaux_Err_Ok;
}
FT_LOCAL( void )
afm_parser_done( AFM_Parser parser )
{
FT_Memory memory = parser->memory;
FT_FREE( parser->stream );
}
FT_LOCAL_DEF( FT_Error )
afm_parser_read_int( AFM_Parser parser,
FT_Int* aint )
{
AFM_ValueRec val;
val.type = AFM_VALUE_TYPE_INTEGER;
if ( afm_parser_read_vals( parser, &val, 1 ) == 1 )
{
*aint = val.u.i;
return PSaux_Err_Ok;
}
else
return PSaux_Err_Syntax_Error;
}
static FT_Error
afm_parse_track_kern( AFM_Parser parser )
{
AFM_FontInfo fi = parser->FontInfo;
AFM_TrackKern tk;
char* key;
FT_UInt len;
int n = -1;
if ( afm_parser_read_int( parser, &fi->NumTrackKern ) )
goto Fail;
if ( fi->NumTrackKern )
{
FT_Memory memory = parser->memory;
FT_Error error;
if ( FT_QNEW_ARRAY( fi->TrackKerns, fi->NumTrackKern ) )
return error;
}
while ( ( key = afm_parser_next_key( parser, 1, &len ) ) != 0 )
{
AFM_ValueRec shared_vals[5];
switch ( afm_tokenize( key, len ) )
{
case AFM_TOKEN_TRACKKERN:
n++;
if ( n >= fi->NumTrackKern )
goto Fail;
tk = fi->TrackKerns + n;
shared_vals[0].type = AFM_VALUE_TYPE_INTEGER;
shared_vals[1].type = AFM_VALUE_TYPE_FIXED;
shared_vals[2].type = AFM_VALUE_TYPE_FIXED;
shared_vals[3].type = AFM_VALUE_TYPE_FIXED;
shared_vals[4].type = AFM_VALUE_TYPE_FIXED;
if ( afm_parser_read_vals( parser, shared_vals, 5 ) != 5 )
goto Fail;
tk->degree = shared_vals[0].u.i;
tk->min_ptsize = shared_vals[1].u.f;
tk->min_kern = shared_vals[2].u.f;
tk->max_ptsize = shared_vals[3].u.f;
tk->max_kern = shared_vals[4].u.f;
/* is this correct? */
if ( tk->degree < 0 && tk->min_kern > 0 )
tk->min_kern = -tk->min_kern;
break;
case AFM_TOKEN_ENDTRACKKERN:
case AFM_TOKEN_ENDKERNDATA:
case AFM_TOKEN_ENDFONTMETRICS:
fi->NumTrackKern = n + 1;
return PSaux_Err_Ok;
break;
case AFM_TOKEN_UNKNOWN:
break;
default:
goto Fail;
break;
}
}
Fail:
return PSaux_Err_Syntax_Error;
}
#undef KERN_INDEX
#define KERN_INDEX( g1, g2 ) ( ( (FT_ULong)g1 << 16 ) | g2 )
/* compare two kerning pairs */
FT_CALLBACK_DEF( int )
afm_compare_kern_pairs( const void* a,
const void* b )
{
AFM_KernPair kp1 = (AFM_KernPair)a;
AFM_KernPair kp2 = (AFM_KernPair)b;
FT_ULong index1 = KERN_INDEX( kp1->index1, kp1->index2 );
FT_ULong index2 = KERN_INDEX( kp2->index1, kp2->index2 );
return (int)( index1 - index2 );
}
static FT_Error
afm_parse_kern_pairs( AFM_Parser parser )
{
AFM_FontInfo fi = parser->FontInfo;
AFM_KernPair kp;
char* key;
FT_UInt len;
int n = -1;
if ( afm_parser_read_int( parser, &fi->NumKernPair ) )
goto Fail;
if ( fi->NumKernPair )
{
FT_Memory memory = parser->memory;
FT_Error error;
if ( FT_QNEW_ARRAY( fi->KernPairs, fi->NumKernPair ) )
return error;
}
while ( ( key = afm_parser_next_key( parser, 1, &len ) ) != 0 )
{
AFM_Token token = afm_tokenize( key, len );
switch ( token )
{
case AFM_TOKEN_KP:
case AFM_TOKEN_KPX:
case AFM_TOKEN_KPY:
{
FT_Int r;
AFM_ValueRec shared_vals[4];
n++;
if ( n >= fi->NumKernPair )
goto Fail;
kp = fi->KernPairs + n;
shared_vals[0].type = AFM_VALUE_TYPE_INDEX;
shared_vals[1].type = AFM_VALUE_TYPE_INDEX;
shared_vals[2].type = AFM_VALUE_TYPE_INTEGER;
shared_vals[3].type = AFM_VALUE_TYPE_INTEGER;
r = afm_parser_read_vals( parser, shared_vals, 4 );
if ( r < 3 )
goto Fail;
kp->index1 = shared_vals[0].u.i;
kp->index2 = shared_vals[1].u.i;
if ( token == AFM_TOKEN_KPY )
{
kp->x = 0;
kp->y = shared_vals[2].u.i;
}
else
{
kp->x = shared_vals[2].u.i;
kp->y = ( token == AFM_TOKEN_KP && r == 4 )
? shared_vals[3].u.i : 0;
}
}
break;
case AFM_TOKEN_ENDKERNPAIRS:
case AFM_TOKEN_ENDKERNDATA:
case AFM_TOKEN_ENDFONTMETRICS:
fi->NumKernPair = n + 1;
ft_qsort( fi->KernPairs, fi->NumKernPair,
sizeof( AFM_KernPairRec ),
afm_compare_kern_pairs );
return PSaux_Err_Ok;
case AFM_TOKEN_UNKNOWN:
break;
default:
goto Fail;
break;
}
}
Fail:
return PSaux_Err_Syntax_Error;
}
static FT_Error
afm_parse_kern_data( AFM_Parser parser )
{
FT_Error error;
char* key;
FT_UInt len;
while ( ( key = afm_parser_next_key( parser, 1, &len ) ) != 0 )
{
switch ( afm_tokenize( key, len ) )
{
case AFM_TOKEN_STARTTRACKKERN:
error = afm_parse_track_kern( parser );
if ( error )
return error;
break;
case AFM_TOKEN_STARTKERNPAIRS:
case AFM_TOKEN_STARTKERNPAIRS0:
error = afm_parse_kern_pairs( parser );
if ( error )
return error;
break;
case AFM_TOKEN_ENDKERNDATA:
case AFM_TOKEN_ENDFONTMETRICS:
return PSaux_Err_Ok;
case AFM_TOKEN_UNKNOWN:
break;
default:
goto Fail;
break;
}
}
Fail:
return PSaux_Err_Syntax_Error;
}
static FT_Error
afm_parser_skip_section( AFM_Parser parser,
FT_UInt n,
AFM_Token end_section )
{
char* key;
FT_UInt len;
while ( n-- > 0 )
{
key = afm_parser_next_key( parser, 1, NULL );
if ( !key )
goto Fail;
}
while ( ( key = afm_parser_next_key( parser, 1, &len ) ) != 0 )
{
AFM_Token token = afm_tokenize( key, len );
if ( token == end_section || token == AFM_TOKEN_ENDFONTMETRICS )
return PSaux_Err_Ok;
}
Fail:
return PSaux_Err_Syntax_Error;
}
FT_LOCAL_DEF( FT_Error )
afm_parser_parse( AFM_Parser parser )
{
FT_Memory memory = parser->memory;
AFM_FontInfo fi = parser->FontInfo;
FT_Error error = PSaux_Err_Syntax_Error;
char* key;
FT_UInt len;
FT_Int metrics_sets = 0;
if ( !fi )
return PSaux_Err_Invalid_Argument;
key = afm_parser_next_key( parser, 1, &len );
if ( !key || len != 16 ||
ft_strncmp( key, "StartFontMetrics", 16 ) != 0 )
return PSaux_Err_Unknown_File_Format;
while ( ( key = afm_parser_next_key( parser, 1, &len ) ) != 0 )
{
AFM_ValueRec shared_vals[4];
switch ( afm_tokenize( key, len ) )
{
case AFM_TOKEN_METRICSSETS:
if ( afm_parser_read_int( parser, &metrics_sets ) )
goto Fail;
if ( metrics_sets != 0 && metrics_sets != 2 )
{
error = PSaux_Err_Unimplemented_Feature;
goto Fail;
}
break;
case AFM_TOKEN_ISCIDFONT:
shared_vals[0].type = AFM_VALUE_TYPE_BOOL;
if ( afm_parser_read_vals( parser, shared_vals, 1 ) != 1 )
goto Fail;
fi->IsCIDFont = shared_vals[0].u.b;
break;
case AFM_TOKEN_FONTBBOX:
shared_vals[0].type = AFM_VALUE_TYPE_FIXED;
shared_vals[1].type = AFM_VALUE_TYPE_FIXED;
shared_vals[2].type = AFM_VALUE_TYPE_FIXED;
shared_vals[3].type = AFM_VALUE_TYPE_FIXED;
if ( afm_parser_read_vals( parser, shared_vals, 4 ) != 4 )
goto Fail;
fi->FontBBox.xMin = shared_vals[0].u.f;
fi->FontBBox.yMin = shared_vals[1].u.f;
fi->FontBBox.xMax = shared_vals[2].u.f;
fi->FontBBox.yMax = shared_vals[3].u.f;
break;
case AFM_TOKEN_ASCENDER:
shared_vals[0].type = AFM_VALUE_TYPE_FIXED;
if ( afm_parser_read_vals( parser, shared_vals, 1 ) != 1 )
goto Fail;
fi->Ascender = shared_vals[0].u.f;
break;
case AFM_TOKEN_DESCENDER:
shared_vals[0].type = AFM_VALUE_TYPE_FIXED;
if ( afm_parser_read_vals( parser, shared_vals, 1 ) != 1 )
goto Fail;
fi->Descender = shared_vals[0].u.f;
break;
case AFM_TOKEN_STARTCHARMETRICS:
{
FT_Int n;
if ( afm_parser_read_int( parser, &n ) )
goto Fail;
error = afm_parser_skip_section( parser, n,
AFM_TOKEN_ENDCHARMETRICS );
if ( error )
return error;
}
break;
case AFM_TOKEN_STARTKERNDATA:
error = afm_parse_kern_data( parser );
if ( error )
goto Fail;
/* fall through since we only support kern data */
case AFM_TOKEN_ENDFONTMETRICS:
return PSaux_Err_Ok;
break;
default:
break;
}
}
Fail:
FT_FREE( fi->TrackKerns );
fi->NumTrackKern = 0;
FT_FREE( fi->KernPairs );
fi->NumKernPair = 0;
fi->IsCIDFont = 0;
return error;
}
/* END */