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freetype/src/sfnt/ttpost.c

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Initial revision
1999-12-17 00:11:37 +01:00
/***************************************************************************/
/* */
/* ttpost.c */
/* */
/* Postscript names table processing (body). */
/* */
/* Copyright 1996-1999 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 <ttpost.h>
#include <ftstream.h>
#include <tterrors.h>
#include <ttload.h>
#include <tttags.h>
/* the 258 default Mac PS glyph names */
const TT_String* TT_Mac_Postscript_Names[258] =
{
/* 0 */
".notdef",
".null",
"CR",
"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",
"nbspace",
"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 */
"Idot",
"Scedilla",
"scedilla",
"Cacute",
"cacute",
"Ccaron",
"ccaron",
"dmacron",
};
static
TT_Error Load_Format_20( TT_Face face,
FT_Stream stream )
{
FT_Memory memory = stream->memory;
TT_Error error;
TT_Int num_glyphs;
TT_Int num_names;
TT_UShort* glyph_indices = 0;
TT_Char** name_strings = 0;
if ( 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->root.num_glyphs )
{
error = TT_Err_Invalid_File_Format;
goto Exit;
}
/* load the indices */
{
TT_Int n;
if ( ALLOC_ARRAY ( glyph_indices, num_glyphs, TT_UShort ) ||
ACCESS_Frame( num_glyphs * 2L ) )
goto Fail;
for ( n = 0; n < num_glyphs; n++ )
glyph_indices[n] = GET_UShort();
FORGET_Frame();
}
/* compute number of names stored in table */
{
TT_Int n;
num_names = 0;
for ( n = 0; n < num_glyphs; n++ )
{
TT_Int index;
index = glyph_indices[n];
if ( index >= 258 )
{
index -= 257;
if ( index > num_names )
num_names = index;
}
}
}
/* now load the name strings */
{
TT_Int n;
if ( ALLOC_ARRAY( name_strings, num_names, TT_Char* ) )
goto Fail;
for ( n = 0; n < num_names; n++ )
{
TT_UInt len;
if ( READ_Byte ( len ) ||
ALLOC_ARRAY( name_strings[n], len+1, TT_Char ) ||
FILE_Read ( name_strings[n], len ) )
goto Fail1;
name_strings[n][len] = '\0';
}
}
/* all right, set table fields and exit successfuly */
{
TT_Post_20* table = &face->postscript_names.names.format_20;
table->num_glyphs = num_glyphs;
table->num_names = num_names;
table->glyph_indices = glyph_indices;
table->glyph_names = name_strings;
}
return TT_Err_Ok;
Fail1:
{
TT_Int n;
for ( n = 0; n < num_names; n++ )
FREE( name_strings[n] );
}
Fail:
FREE( name_strings );
FREE( glyph_indices );
Exit:
return error;
}
static
TT_Error Load_Format_25( TT_Face face,
FT_Stream stream )
{
FT_Memory memory = stream->memory;
TT_Error error;
TT_Int num_glyphs;
TT_Char* offset_table = 0;
/* UNDOCUMENTED! This value appears only in the Apple TT specs. */
if ( READ_UShort( num_glyphs ) )
goto Exit;
/* check the number of glyphs */
if ( num_glyphs > face->root.num_glyphs || num_glyphs > 258 )
{
error = TT_Err_Invalid_File_Format;
goto Exit;
}
if ( ALLOC ( offset_table, num_glyphs ) ||
FILE_Read( offset_table, num_glyphs ) )
goto Fail;
/* now check the offset table */
{
TT_Int n;
for ( n = 0; n < num_glyphs; n++ )
{
TT_Long index = (TT_Long)n + offset_table[n];
if ( index < 0 || index > num_glyphs )
{
error = TT_Err_Invalid_File_Format;
goto Fail;
}
}
}
/* OK, set table fields and exit successfuly */
{
TT_Post_25* table = &face->postscript_names.names.format_25;
table->num_glyphs = num_glyphs;
table->offsets = offset_table;
}
return TT_Err_Ok;
Fail:
FREE( offset_table );
Exit:
return error;
}
static
TT_Error Load_Post_Names( TT_Face face )
{
FT_Stream stream;
TT_Error error;
/* 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, 0 );
if (error) goto Exit;
/* now read postscript table */
switch ( face->postscript.FormatType )
{
case 0x00020000:
error = Load_Format_20( face, stream );
break;
case 0x00028000:
error = Load_Format_25( face, stream );
break;
default:
error = TT_Err_Invalid_File_Format;
}
face->postscript_names.loaded = 1;
Exit:
return error;
}
LOCAL_FUNC
void TT_Free_Post_Names( TT_Face face )
{
FT_Memory memory = face->root.memory;
TT_Post_Names* names = &face->postscript_names;
if ( names->loaded )
{
switch ( face->postscript.FormatType )
{
case 0x00020000:
{
TT_Post_20* table = &names->names.format_20;
TT_UInt n;
FREE( table->glyph_indices );
table->num_glyphs = 0;
for ( n = 0; n < table->num_names; n++ )
FREE( table->glyph_names[n] );
FREE( table->glyph_names );
table->num_names = 0;
}
break;
case 0x00028000:
{
TT_Post_25* table = &names->names.format_25;
FREE( table->offsets );
table->num_glyphs = 0;
}
break;
}
}
names->loaded = 0;
}
/*************************************************************************/
/* */
/* <Function> */
/* TT_Get_PS_Name */
/* */
/* <Description> */
/* Gets the PostScript glyph name of a glyph. */
/* */
/* <Input> */
/* index :: The glyph index. */
/* */
/* PSname :: The address of a string pointer. Will be NULL in case */
/* of error, otherwise it is a pointer to the glyph name. */
/* */
/* You must not modify the returned string! */
/* */
/* <Output> */
/* TrueType error code. 0 means success. */
/* */
EXPORT_FUNC
TT_Error TT_Get_PS_Name( TT_Face face,
TT_UInt index,
TT_String** PSname )
{
TT_Error error;
TT_Post_Names* names;
if ( !face )
return TT_Err_Invalid_Face_Handle;
if ( index >= (TT_UInt)face->root.num_glyphs )
return TT_Err_Invalid_Glyph_Index;
names = &face->postscript_names;
/* `.notdef' by default */
*PSname = (TT_String*)TT_Mac_Postscript_Names[0];
switch ( face->postscript.FormatType )
{
case 0x00010000:
if ( index < 258 ) /* paranoid checking */
*PSname = (TT_String*)TT_Mac_Postscript_Names[index];
break;
case 0x00020000:
{
TT_Post_20* table = &names->names.format_20;
if ( !names->loaded )
{
error = Load_Post_Names( face );
if ( error )
break;
}
if ( index < table->num_glyphs )
{
TT_UShort name_index = table->glyph_indices[index];
if ( name_index < 258 )
*PSname = (TT_String*)TT_Mac_Postscript_Names[name_index];
else
*PSname = (TT_String*)table->glyph_names[name_index - 258];
}
}
break;
case 0x00028000:
{
TT_Post_25* table = &names->names.format_25;
if ( !names->loaded )
{
error = Load_Post_Names( face );
if ( error )
break;
}
if ( index < table->num_glyphs ) /* paranoid checking */
{
index += table->offsets[index];
*PSname = (TT_String*)TT_Mac_Postscript_Names[index];
}
}
break;
case 0x00030000:
break; /* nothing to do */
}
return TT_Err_Ok;
}
/* END */
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