ref: e9c50fa77de58b749b4b95706f7b55bfff0dd27f
dir: /src/sfnt/ttpost.c/
/****************************************************************************
*
* ttpost.c
*
* PostScript name table processing for TrueType and OpenType fonts
* (body).
*
* Copyright (C) 1996-2021 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.
*
*/
/**************************************************************************
*
* The post table is not completely loaded by the core engine. This
* file loads the missing PS glyph names and implements an API to access
* them.
*
*/
#include <freetype/internal/ftdebug.h>
#include <freetype/internal/ftstream.h>
#include <freetype/tttags.h>
#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
#include "ttpost.h"
#include "sferrors.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 ttpost
/* If this configuration macro is defined, we rely on the `psnames' */
/* module to grab the glyph names. */
#ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
#include <freetype/internal/services/svpscmap.h>
#define MAC_NAME( x ) (FT_String*)psnames->macintosh_name( (FT_UInt)(x) )
#else /* FT_CONFIG_OPTION_POSTSCRIPT_NAMES */
/* Otherwise, we ignore the `psnames' module, and provide our own */
/* table of Mac names. Thus, it is possible to build a version of */
/* FreeType without the Type 1 driver & psnames module. */
#define MAC_NAME( x ) (FT_String*)tt_post_default_names[x]
/* the 258 default Mac PS glyph names; see file `tools/glnames.py' */
static const FT_String* const tt_post_default_names[258] =
{
/* 0 */
".notdef", ".null", "nonmarkingreturn", "space", "exclam",
"quotedbl", "numbersign", "dollar", "percent", "ampersand",
/* 10 */
"quotesingle", "parenleft", "parenright", "asterisk", "plus",
"comma", "hyphen", "period", "slash", "zero",
/* 20 */
"one", "two", "three", "four", "five",
"six", "seven", "eight", "nine", "colon",
/* 30 */
"semicolon", "less", "equal", "greater", "question",
"at", "A", "B", "C", "D",
/* 40 */
"E", "F", "G", "H", "I",
"J", "K", "L", "M", "N",
/* 50 */
"O", "P", "Q", "R", "S",
"T", "U", "V", "W", "X",
/* 60 */
"Y", "Z", "bracketleft", "backslash", "bracketright",
"asciicircum", "underscore", "grave", "a", "b",
/* 70 */
"c", "d", "e", "f", "g",
"h", "i", "j", "k", "l",
/* 80 */
"m", "n", "o", "p", "q",
"r", "s", "t", "u", "v",
/* 90 */
"w", "x", "y", "z", "braceleft",
"bar", "braceright", "asciitilde", "Adieresis", "Aring",
/* 100 */
"Ccedilla", "Eacute", "Ntilde", "Odieresis", "Udieresis",
"aacute", "agrave", "acircumflex", "adieresis", "atilde",
/* 110 */
"aring", "ccedilla", "eacute", "egrave", "ecircumflex",
"edieresis", "iacute", "igrave", "icircumflex", "idieresis",
/* 120 */
"ntilde", "oacute", "ograve", "ocircumflex", "odieresis",
"otilde", "uacute", "ugrave", "ucircumflex", "udieresis",
/* 130 */
"dagger", "degree", "cent", "sterling", "section",
"bullet", "paragraph", "germandbls", "registered", "copyright",
/* 140 */
"trademark", "acute", "dieresis", "notequal", "AE",
"Oslash", "infinity", "plusminus", "lessequal", "greaterequal",
/* 150 */
"yen", "mu", "partialdiff", "summation", "product",
"pi", "integral", "ordfeminine", "ordmasculine", "Omega",
/* 160 */
"ae", "oslash", "questiondown", "exclamdown", "logicalnot",
"radical", "florin", "approxequal", "Delta", "guillemotleft",
/* 170 */
"guillemotright", "ellipsis", "nonbreakingspace", "Agrave", "Atilde",
"Otilde", "OE", "oe", "endash", "emdash",
/* 180 */
"quotedblleft", "quotedblright", "quoteleft", "quoteright", "divide",
"lozenge", "ydieresis", "Ydieresis", "fraction", "currency",
/* 190 */
"guilsinglleft", "guilsinglright", "fi", "fl", "daggerdbl",
"periodcentered", "quotesinglbase", "quotedblbase", "perthousand", "Acircumflex",
/* 200 */
"Ecircumflex", "Aacute", "Edieresis", "Egrave", "Iacute",
"Icircumflex", "Idieresis", "Igrave", "Oacute", "Ocircumflex",
/* 210 */
"apple", "Ograve", "Uacute", "Ucircumflex", "Ugrave",
"dotlessi", "circumflex", "tilde", "macron", "breve",
/* 220 */
"dotaccent", "ring", "cedilla", "hungarumlaut", "ogonek",
"caron", "Lslash", "lslash", "Scaron", "scaron",
/* 230 */
"Zcaron", "zcaron", "brokenbar", "Eth", "eth",
"Yacute", "yacute", "Thorn", "thorn", "minus",
/* 240 */
"multiply", "onesuperior", "twosuperior", "threesuperior", "onehalf",
"onequarter", "threequarters", "franc", "Gbreve", "gbreve",
/* 250 */
"Idotaccent", "Scedilla", "scedilla", "Cacute", "cacute",
"Ccaron", "ccaron", "dcroat",
};
#endif /* FT_CONFIG_OPTION_POSTSCRIPT_NAMES */
static FT_Error
load_format_20( TT_Face face,
FT_Stream stream,
FT_ULong post_limit )
{
FT_Memory memory = stream->memory;
FT_Error error;
FT_Int num_glyphs;
FT_UShort num_names;
FT_UShort* glyph_indices = NULL;
FT_Char** name_strings = NULL;
if ( FT_READ_USHORT( num_glyphs ) )
goto Exit;
/* UNDOCUMENTED! The number of glyphs in this table can be smaller */
/* than the value in the maxp table (cf. cyberbit.ttf). */
/* There already exist fonts which have more than 32768 glyph names */
/* in this table, so the test for this threshold has been dropped. */
if ( num_glyphs > face->max_profile.numGlyphs )
{
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
/* load the indices */
{
FT_Int n;
if ( FT_NEW_ARRAY ( glyph_indices, num_glyphs ) ||
FT_FRAME_ENTER( num_glyphs * 2L ) )
goto Fail;
for ( n = 0; n < num_glyphs; n++ )
glyph_indices[n] = FT_GET_USHORT();
FT_FRAME_EXIT();
}
/* compute number of names stored in table */
{
FT_Int n;
num_names = 0;
for ( n = 0; n < num_glyphs; n++ )
{
FT_Int idx;
idx = glyph_indices[n];
if ( idx >= 258 )
{
idx -= 257;
if ( idx > num_names )
num_names = (FT_UShort)idx;
}
}
}
/* now load the name strings */
{
FT_UShort n;
if ( FT_NEW_ARRAY( name_strings, num_names ) )
goto Fail;
for ( n = 0; n < num_names; n++ )
{
FT_UInt len;
if ( FT_STREAM_POS() >= post_limit )
break;
else
{
FT_TRACE6(( "load_format_20: %ld byte left in post table\n",
post_limit - FT_STREAM_POS() ));
if ( FT_READ_BYTE( len ) )
goto Fail1;
}
if ( len > post_limit ||
FT_STREAM_POS() > post_limit - len )
{
FT_Int d = (FT_Int)post_limit - (FT_Int)FT_STREAM_POS();
FT_ERROR(( "load_format_20:"
" exceeding string length (%d),"
" truncating at end of post table (%d byte left)\n",
len, d ));
len = (FT_UInt)FT_MAX( 0, d );
}
if ( FT_NEW_ARRAY( name_strings[n], len + 1 ) ||
FT_STREAM_READ( name_strings[n], len ) )
goto Fail1;
name_strings[n][len] = '\0';
}
if ( n < num_names )
{
FT_ERROR(( "load_format_20:"
" all entries in post table are already parsed,"
" using NULL names for gid %d - %d\n",
n, num_names - 1 ));
for ( ; n < num_names; n++ )
if ( FT_NEW_ARRAY( name_strings[n], 1 ) )
goto Fail1;
else
name_strings[n][0] = '\0';
}
}
/* all right, set table fields and exit successfully */
{
TT_Post_20 table = &face->postscript_names.names.format_20;
table->num_glyphs = (FT_UShort)num_glyphs;
table->num_names = (FT_UShort)num_names;
table->glyph_indices = glyph_indices;
table->glyph_names = name_strings;
}
return FT_Err_Ok;
Fail1:
{
FT_UShort n;
for ( n = 0; n < num_names; n++ )
FT_FREE( name_strings[n] );
}
Fail:
FT_FREE( name_strings );
FT_FREE( glyph_indices );
Exit:
return error;
}
static FT_Error
load_format_25( TT_Face face,
FT_Stream stream,
FT_ULong post_limit )
{
FT_Memory memory = stream->memory;
FT_Error error;
FT_Int num_glyphs;
FT_Char* offset_table = NULL;
FT_UNUSED( post_limit );
if ( FT_READ_USHORT( num_glyphs ) )
goto Exit;
/* check the number of glyphs */
if ( num_glyphs > face->max_profile.numGlyphs ||
num_glyphs > 258 ||
num_glyphs < 1 )
{
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
if ( FT_NEW_ARRAY( offset_table, num_glyphs ) ||
FT_STREAM_READ( offset_table, num_glyphs ) )
goto Fail;
/* now check the offset table */
{
FT_Int n;
for ( n = 0; n < num_glyphs; n++ )
{
FT_Long idx = (FT_Long)n + offset_table[n];
if ( idx < 0 || idx > num_glyphs )
{
error = FT_THROW( Invalid_File_Format );
goto Fail;
}
}
}
/* OK, set table fields and exit successfully */
{
TT_Post_25 table = &face->postscript_names.names.format_25;
table->num_glyphs = (FT_UShort)num_glyphs;
table->offsets = offset_table;
}
return FT_Err_Ok;
Fail:
FT_FREE( offset_table );
Exit:
return error;
}
static FT_Error
load_post_names( TT_Face face )
{
FT_Stream stream;
FT_Error error;
FT_Fixed format;
FT_ULong post_len;
FT_ULong post_limit;
/* get a stream for the face's resource */
stream = face->root.stream;
/* seek to the beginning of the PS names table */
error = face->goto_table( face, TTAG_post, stream, &post_len );
if ( error )
goto Exit;
post_limit = FT_STREAM_POS() + post_len;
format = face->postscript.FormatType;
/* go to beginning of subtable */
if ( FT_STREAM_SKIP( 32 ) )
goto Exit;
/* now read postscript table */
if ( format == 0x00020000L )
error = load_format_20( face, stream, post_limit );
else if ( format == 0x00025000L )
error = load_format_25( face, stream, post_limit );
else
error = FT_THROW( Invalid_File_Format );
face->postscript_names.loaded = 1;
Exit:
return error;
}
FT_LOCAL_DEF( void )
tt_face_free_ps_names( TT_Face face )
{
FT_Memory memory = face->root.memory;
TT_Post_Names names = &face->postscript_names;
FT_Fixed format;
if ( names->loaded )
{
format = face->postscript.FormatType;
if ( format == 0x00020000L )
{
TT_Post_20 table = &names->names.format_20;
FT_UShort n;
FT_FREE( table->glyph_indices );
table->num_glyphs = 0;
for ( n = 0; n < table->num_names; n++ )
FT_FREE( table->glyph_names[n] );
FT_FREE( table->glyph_names );
table->num_names = 0;
}
else if ( format == 0x00025000L )
{
TT_Post_25 table = &names->names.format_25;
FT_FREE( table->offsets );
table->num_glyphs = 0;
}
}
names->loaded = 0;
}
/**************************************************************************
*
* @Function:
* tt_face_get_ps_name
*
* @Description:
* Get the PostScript glyph name of a glyph.
*
* @Input:
* face ::
* A handle to the parent face.
*
* idx ::
* The glyph index.
*
* @InOut:
* PSname ::
* The address of a string pointer. Undefined in case of
* error, otherwise it is a pointer to the glyph name.
*
* You must not modify the returned string!
*
* @Output:
* FreeType error code. 0 means success.
*/
FT_LOCAL_DEF( FT_Error )
tt_face_get_ps_name( TT_Face face,
FT_UInt idx,
FT_String** PSname )
{
FT_Error error;
TT_Post_Names names;
FT_Fixed format;
#ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
FT_Service_PsCMaps psnames;
#endif
if ( !face )
return FT_THROW( Invalid_Face_Handle );
if ( idx >= (FT_UInt)face->max_profile.numGlyphs )
return FT_THROW( Invalid_Glyph_Index );
#ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
psnames = (FT_Service_PsCMaps)face->psnames;
if ( !psnames )
return FT_THROW( Unimplemented_Feature );
#endif
names = &face->postscript_names;
/* `.notdef' by default */
*PSname = MAC_NAME( 0 );
format = face->postscript.FormatType;
if ( format == 0x00010000L )
{
if ( idx < 258 ) /* paranoid checking */
*PSname = MAC_NAME( idx );
}
else if ( format == 0x00020000L )
{
TT_Post_20 table = &names->names.format_20;
if ( !names->loaded )
{
error = load_post_names( face );
if ( error )
goto End;
}
if ( idx < (FT_UInt)table->num_glyphs )
{
FT_UShort name_index = table->glyph_indices[idx];
if ( name_index < 258 )
*PSname = MAC_NAME( name_index );
else
*PSname = (FT_String*)table->glyph_names[name_index - 258];
}
}
else if ( format == 0x00025000L )
{
TT_Post_25 table = &names->names.format_25;
if ( !names->loaded )
{
error = load_post_names( face );
if ( error )
goto End;
}
if ( idx < (FT_UInt)table->num_glyphs ) /* paranoid checking */
*PSname = MAC_NAME( (FT_Int)idx + table->offsets[idx] );
}
/* nothing to do for format == 0x00030000L */
End:
return FT_Err_Ok;
}
#else /* !TT_CONFIG_OPTION_POSTSCRIPT_NAMES */
/* ANSI C doesn't like empty source files */
typedef int _tt_post_dummy;
#endif /* !TT_CONFIG_OPTION_POSTSCRIPT_NAMES */
/* END */