535 lines
15 KiB
C
535 lines
15 KiB
C
/***************************************************************************/
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/* */
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/* ttpost.c */
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/* */
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/* Postcript name table processing for TrueType and OpenType fonts */
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/* (body). */
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/* */
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/* Copyright 1996-2001 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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/*************************************************************************/
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/* */
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/* The post table is not completely loaded by the core engine. This */
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/* file loads the missing PS glyph names and implements an API to access */
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/* them. */
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/* */
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/*************************************************************************/
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#include <ft2build.h>
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#include FT_INTERNAL_STREAM_H
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#include FT_TRUETYPE_TAGS_H
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#include "ttpost.h"
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#include "ttload.h"
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#include "sferrors.h"
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/*************************************************************************/
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/* */
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/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
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/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
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/* messages during execution. */
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/* */
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_ttpost
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/* If this configuration macro is defined, we rely on the `PSNames' */
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/* module to grab the glyph names. */
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#ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
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#include <freetype/internal/psnames.h>
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#define MAC_NAME( x ) ( (FT_String*)psnames->macintosh_name( x ) )
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#else /* FT_CONFIG_OPTION_POSTSCRIPT_NAMES */
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/* Otherwise, we ignore the `PSNames' module, and provide our own */
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/* table of Mac names. Thus, it is possible to build a version of */
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/* FreeType without the Type 1 driver & PSNames module. */
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#define MAC_NAME( x ) TT_Post_Default_Names[x]
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/* the 258 default Mac PS glyph names */
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FT_String* TT_Post_Default_Names[258] =
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{
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/* 0 */
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".notdef", ".null", "CR", "space", "exclam",
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"quotedbl", "numbersign", "dollar", "percent", "ampersand",
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/* 10 */
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"quotesingle", "parenleft", "parenright", "asterisk", "plus",
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"comma", "hyphen", "period", "slash", "zero",
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/* 20 */
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"one", "two", "three", "four", "five",
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"six", "seven", "eight", "nine", "colon",
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/* 30 */
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"semicolon", "less", "equal", "greater", "question",
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"at", "A", "B", "C", "D",
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/* 40 */
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"E", "F", "G", "H", "I",
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"J", "K", "L", "M", "N",
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/* 50 */
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"O", "P", "Q", "R", "S",
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"T", "U", "V", "W", "X",
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/* 60 */
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"Y", "Z", "bracketleft", "backslash", "bracketright",
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"asciicircum", "underscore", "grave", "a", "b",
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/* 70 */
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"c", "d", "e", "f", "g",
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"h", "i", "j", "k", "l",
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/* 80 */
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"m", "n", "o", "p", "q",
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"r", "s", "t", "u", "v",
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/* 90 */
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"w", "x", "y", "z", "braceleft",
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"bar", "braceright", "asciitilde", "Adieresis", "Aring",
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/* 100 */
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"Ccedilla", "Eacute", "Ntilde", "Odieresis", "Udieresis",
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"aacute", "agrave", "acircumflex", "adieresis", "atilde",
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/* 110 */
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"aring", "ccedilla", "eacute", "egrave", "ecircumflex",
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"edieresis", "iacute", "igrave", "icircumflex", "idieresis",
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/* 120 */
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"ntilde", "oacute", "ograve", "ocircumflex", "odieresis",
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"otilde", "uacute", "ugrave", "ucircumflex", "udieresis",
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/* 130 */
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"dagger", "degree", "cent", "sterling", "section",
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"bullet", "paragraph", "germandbls", "registered", "copyright",
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/* 140 */
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"trademark", "acute", "dieresis", "notequal", "AE",
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"Oslash", "infinity", "plusminus", "lessequal", "greaterequal",
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/* 150 */
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"yen", "mu", "partialdiff", "summation", "product",
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"pi", "integral", "ordfeminine", "ordmasculine", "Omega",
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/* 160 */
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"ae", "oslash", "questiondown", "exclamdown", "logicalnot",
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"radical", "florin", "approxequal", "Delta", "guillemotleft",
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/* 170 */
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"guillemotright", "ellipsis", "nbspace", "Agrave", "Atilde",
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"Otilde", "OE", "oe", "endash", "emdash",
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/* 180 */
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"quotedblleft", "quotedblright", "quoteleft", "quoteright", "divide",
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"lozenge", "ydieresis", "Ydieresis", "fraction", "currency",
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/* 190 */
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"guilsinglleft", "guilsinglright", "fi", "fl", "daggerdbl",
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"periodcentered", "quotesinglbase", "quotedblbase", "perthousand", "Acircumflex",
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/* 200 */
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"Ecircumflex", "Aacute", "Edieresis", "Egrave", "Iacute",
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"Icircumflex", "Idieresis", "Igrave", "Oacute", "Ocircumflex",
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/* 210 */
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"apple", "Ograve", "Uacute", "Ucircumflex", "Ugrave",
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"dotlessi", "circumflex", "tilde", "macron", "breve",
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/* 220 */
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"dotaccent", "ring", "cedilla", "hungarumlaut", "ogonek",
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"caron", "Lslash", "lslash", "Scaron", "scaron",
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/* 230 */
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"Zcaron", "zcaron", "brokenbar", "Eth", "eth",
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"Yacute", "yacute", "Thorn", "thorn", "minus",
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/* 240 */
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"multiply", "onesuperior", "twosuperior", "threesuperior", "onehalf",
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"onequarter", "threequarters", "franc", "Gbreve", "gbreve",
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/* 250 */
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"Idot", "Scedilla", "scedilla", "Cacute", "cacute",
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"Ccaron", "ccaron", "dmacron",
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};
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#endif /* FT_CONFIG_OPTION_POSTSCRIPT_NAMES */
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static FT_Error
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Load_Format_20( TT_Face face,
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FT_Stream stream )
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{
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FT_Memory memory = stream->memory;
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FT_Error error;
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FT_Int num_glyphs;
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FT_UShort num_names;
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FT_UShort* glyph_indices = 0;
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FT_Char** name_strings = 0;
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if ( READ_UShort( num_glyphs ) )
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goto Exit;
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/* UNDOCUMENTED! The number of glyphs in this table can be smaller */
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/* than the value in the maxp table (cf. cyberbit.ttf). */
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/* There already exist fonts which have more than 32768 glyph names */
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/* in this table, so the test for this threshold has been dropped. */
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if ( num_glyphs > face->root.num_glyphs )
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{
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error = SFNT_Err_Invalid_File_Format;
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goto Exit;
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}
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/* load the indices */
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{
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FT_Int n;
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if ( ALLOC_ARRAY ( glyph_indices, num_glyphs, FT_UShort ) ||
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ACCESS_Frame( num_glyphs * 2L ) )
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goto Fail;
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for ( n = 0; n < num_glyphs; n++ )
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glyph_indices[n] = GET_UShort();
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FORGET_Frame();
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}
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/* compute number of names stored in table */
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{
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FT_Int n;
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num_names = 0;
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for ( n = 0; n < num_glyphs; n++ )
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{
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FT_Int index;
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index = glyph_indices[n];
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if ( index >= 258 )
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{
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index -= 257;
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if ( index > num_names )
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num_names = (FT_UShort)index;
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}
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}
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}
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/* now load the name strings */
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{
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FT_UShort n;
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if ( ALLOC_ARRAY( name_strings, num_names, FT_Char* ) )
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goto Fail;
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for ( n = 0; n < num_names; n++ )
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{
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FT_UInt len;
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if ( READ_Byte ( len ) ||
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ALLOC_ARRAY( name_strings[n], len + 1, FT_Char ) ||
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FILE_Read ( name_strings[n], len ) )
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goto Fail1;
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name_strings[n][len] = '\0';
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}
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}
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/* all right, set table fields and exit successfuly */
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{
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TT_Post_20* table = &face->postscript_names.names.format_20;
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table->num_glyphs = (FT_UShort)num_glyphs;
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table->num_names = (FT_UShort)num_names;
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table->glyph_indices = glyph_indices;
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table->glyph_names = name_strings;
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}
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return SFNT_Err_Ok;
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Fail1:
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{
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FT_UShort n;
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for ( n = 0; n < num_names; n++ )
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FREE( name_strings[n] );
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}
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Fail:
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FREE( name_strings );
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FREE( glyph_indices );
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Exit:
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return error;
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}
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static FT_Error
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Load_Format_25( TT_Face face,
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FT_Stream stream )
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{
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FT_Memory memory = stream->memory;
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FT_Error error;
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FT_Int num_glyphs;
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FT_Char* offset_table = 0;
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/* UNDOCUMENTED! This value appears only in the Apple TT specs. */
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if ( READ_UShort( num_glyphs ) )
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goto Exit;
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/* check the number of glyphs */
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if ( num_glyphs > face->root.num_glyphs || num_glyphs > 258 )
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{
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error = SFNT_Err_Invalid_File_Format;
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goto Exit;
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}
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if ( ALLOC ( offset_table, num_glyphs ) ||
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FILE_Read( offset_table, num_glyphs ) )
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goto Fail;
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/* now check the offset table */
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{
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FT_Int n;
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for ( n = 0; n < num_glyphs; n++ )
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{
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FT_Long index = (FT_Long)n + offset_table[n];
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if ( index < 0 || index > num_glyphs )
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{
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error = SFNT_Err_Invalid_File_Format;
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goto Fail;
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}
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}
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}
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/* OK, set table fields and exit successfuly */
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{
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TT_Post_25* table = &face->postscript_names.names.format_25;
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table->num_glyphs = (FT_UShort)num_glyphs;
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table->offsets = offset_table;
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}
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return SFNT_Err_Ok;
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Fail:
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FREE( offset_table );
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Exit:
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return error;
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}
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static FT_Error
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Load_Post_Names( TT_Face face )
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{
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FT_Stream stream;
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FT_Error error;
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FT_Fixed format;
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/* get a stream for the face's resource */
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stream = face->root.stream;
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/* seek to the beginning of the PS names table */
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error = face->goto_table( face, TTAG_post, stream, 0 );
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if ( error )
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goto Exit;
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format = face->postscript.FormatType;
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/* go to beginning of subtable */
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if ( FILE_Skip( 32 ) )
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goto Exit;
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/* now read postscript table */
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switch ( format )
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{
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case 0x00020000L:
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error = Load_Format_20( face, stream );
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break;
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case 0x00028000L:
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error = Load_Format_25( face, stream );
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break;
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default:
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error = SFNT_Err_Invalid_File_Format;
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}
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face->postscript_names.loaded = 1;
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Exit:
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return error;
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}
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FT_LOCAL_DEF void
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TT_Free_Post_Names( TT_Face face )
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{
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FT_Memory memory = face->root.memory;
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TT_Post_Names* names = &face->postscript_names;
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if ( names->loaded )
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{
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switch ( face->postscript.FormatType )
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{
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case 0x00020000L:
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{
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TT_Post_20* table = &names->names.format_20;
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FT_UShort n;
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FREE( table->glyph_indices );
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table->num_glyphs = 0;
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for ( n = 0; n < table->num_names; n++ )
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FREE( table->glyph_names[n] );
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FREE( table->glyph_names );
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table->num_names = 0;
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}
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break;
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case 0x00028000L:
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{
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TT_Post_25* table = &names->names.format_25;
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FREE( table->offsets );
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table->num_glyphs = 0;
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}
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break;
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}
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}
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names->loaded = 0;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* TT_Get_PS_Name */
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/* */
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/* <Description> */
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/* Gets the PostScript glyph name of a glyph. */
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/* */
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/* <Input> */
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/* face :: A handle to the parent face. */
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/* */
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/* index :: The glyph index. */
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/* */
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/* PSname :: The address of a string pointer. Will be NULL in case */
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/* of error, otherwise it is a pointer to the glyph name. */
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/* */
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/* You must not modify the returned string! */
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/* */
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/* <Output> */
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/* FreeType error code. 0 means success. */
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/* */
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FT_LOCAL_DEF FT_Error
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TT_Get_PS_Name( TT_Face face,
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FT_UInt index,
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FT_String** PSname )
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{
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FT_Error error;
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TT_Post_Names* names;
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#ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
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PSNames_Interface* psnames;
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#endif
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if ( !face )
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return SFNT_Err_Invalid_Face_Handle;
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if ( index >= (FT_UInt)face->root.num_glyphs )
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return SFNT_Err_Invalid_Glyph_Index;
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#ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
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psnames = (PSNames_Interface*)face->psnames;
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if ( !psnames )
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return SFNT_Err_Unimplemented_Feature;
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#endif
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names = &face->postscript_names;
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/* `.notdef' by default */
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*PSname = MAC_NAME( 0 );
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switch ( face->postscript.FormatType )
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{
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case 0x00010000L:
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if ( index < 258 ) /* paranoid checking */
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*PSname = MAC_NAME( index );
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break;
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case 0x00020000L:
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{
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TT_Post_20* table = &names->names.format_20;
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if ( !names->loaded )
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{
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error = Load_Post_Names( face );
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if ( error )
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break;
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}
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if ( index < (FT_UInt)table->num_glyphs )
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{
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FT_UShort name_index = table->glyph_indices[index];
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if ( name_index < 258 )
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*PSname = MAC_NAME( name_index );
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else
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*PSname = (FT_String*)table->glyph_names[name_index - 258];
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}
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}
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break;
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case 0x00028000L:
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{
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TT_Post_25* table = &names->names.format_25;
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if ( !names->loaded )
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{
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error = Load_Post_Names( face );
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if ( error )
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break;
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}
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if ( index < (FT_UInt)table->num_glyphs ) /* paranoid checking */
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{
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index += table->offsets[index];
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*PSname = MAC_NAME( index );
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}
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}
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break;
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case 0x00030000L:
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break; /* nothing to do */
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}
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return SFNT_Err_Ok;
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}
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/* END */
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