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TtfUtil.cpp
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TtfUtil.cpp
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/* GRAPHITE2 LICENSING
Copyright 2010, SIL International
All rights reserved.
This library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should also have received a copy of the GNU Lesser General Public
License along with this library in the file named "LICENSE".
If not, write to the Free Software Foundation, 51 Franklin Street,
Suite 500, Boston, MA 02110-1335, USA or visit their web page on the
internet at http://www.fsf.org/licenses/lgpl.html.
Alternatively, the contents of this file may be used under the terms of the
Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public
License, as published by the Free Software Foundation, either version 2
of the License or (at your option) any later version.
*/
/*--------------------------------------------------------------------*//*:Ignore this sentence.
File: TtfUtil.cpp
Responsibility: Alan Ward
Last reviewed: Not yet.
Description
Implements the methods for TtfUtil class. This file should remain portable to any C++
environment by only using standard C++ and the TTF structurs defined in Tt.h.
-------------------------------------------------------------------------------*//*:End Ignore*/
/***********************************************************************************************
Include files
***********************************************************************************************/
// Language headers
//#include <algorithm>
#include <cassert>
#include <cstddef>
#include <cstring>
#include <climits>
#include <cwchar>
//#include <stdexcept>
// Platform headers
// Module headers
#include "inc/TtfUtil.h"
#include "inc/TtfTypes.h"
#include "inc/Endian.h"
/***********************************************************************************************
Forward declarations
***********************************************************************************************/
/***********************************************************************************************
Local Constants and static variables
***********************************************************************************************/
namespace
{
#ifdef ALL_TTFUTILS
// max number of components allowed in composite glyphs
const int kMaxGlyphComponents = 8;
#endif
template <int R, typename T>
inline float fixed_to_float(const T f) {
return float(f)/float(2^R);
}
/*----------------------------------------------------------------------------------------------
Table of standard Postscript glyph names. From Martin Hosken. Disagress with ttfdump.exe
---------------------------------------------------------------------------------------------*/
#ifdef ALL_TTFUTILS
const int kcPostNames = 258;
const char * rgPostName[kcPostNames] = {
".notdef", ".null", "nonmarkingreturn", "space", "exclam", "quotedbl", "numbersign",
"dollar", "percent", "ampersand", "quotesingle", "parenleft",
"parenright", "asterisk", "plus", "comma", "hyphen", "period", "slash",
"zero", "one", "two", "three", "four", "five", "six", "seven", "eight",
"nine", "colon", "semicolon", "less", "equal", "greater", "question",
"at", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z",
"bracketleft", "backslash", "bracketright", "asciicircum",
"underscore", "grave", "a", "b", "c", "d", "e", "f", "g", "h", "i",
"j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w",
"x", "y", "z", "braceleft", "bar", "braceright", "asciitilde",
"Adieresis", "Aring", "Ccedilla", "Eacute", "Ntilde", "Odieresis",
"Udieresis", "aacute", "agrave", "acircumflex", "adieresis", "atilde",
"aring", "ccedilla", "eacute", "egrave", "ecircumflex", "edieresis",
"iacute", "igrave", "icircumflex", "idieresis", "ntilde", "oacute",
"ograve", "ocircumflex", "odieresis", "otilde", "uacute", "ugrave",
"ucircumflex", "udieresis", "dagger", "degree", "cent", "sterling",
"section", "bullet", "paragraph", "germandbls", "registered",
"copyright", "trademark", "acute", "dieresis", "notequal", "AE",
"Oslash", "infinity", "plusminus", "lessequal", "greaterequal", "yen",
"mu", "partialdiff", "summation", "product", "pi", "integral",
"ordfeminine", "ordmasculine", "Omega", "ae", "oslash", "questiondown",
"exclamdown", "logicalnot", "radical", "florin", "approxequal",
"Delta", "guillemotleft", "guillemotright", "ellipsis", "nonbreakingspace",
"Agrave", "Atilde", "Otilde", "OE", "oe", "endash", "emdash",
"quotedblleft", "quotedblright", "quoteleft", "quoteright", "divide",
"lozenge", "ydieresis", "Ydieresis", "fraction", "currency",
"guilsinglleft", "guilsinglright", "fi", "fl", "daggerdbl", "periodcentered",
"quotesinglbase", "quotedblbase", "perthousand", "Acircumflex",
"Ecircumflex", "Aacute", "Edieresis", "Egrave", "Iacute",
"Icircumflex", "Idieresis", "Igrave", "Oacute", "Ocircumflex",
"apple", "Ograve", "Uacute", "Ucircumflex", "Ugrave", "dotlessi",
"circumflex", "tilde", "macron", "breve", "dotaccent", "ring",
"cedilla", "hungarumlaut", "ogonek", "caron", "Lslash", "lslash",
"Scaron", "scaron", "Zcaron", "zcaron", "brokenbar", "Eth", "eth",
"Yacute", "yacute", "Thorn", "thorn", "minus", "multiply",
"onesuperior", "twosuperior", "threesuperior", "onehalf", "onequarter",
"threequarters", "franc", "Gbreve", "gbreve", "Idotaccent", "Scedilla",
"scedilla", "Cacute", "cacute", "Ccaron", "ccaron",
"dcroat" };
#endif
} // end of namespace
/***********************************************************************************************
Methods
***********************************************************************************************/
/* Note on error processing: The code guards against bad glyph ids being used to look up data
in open ended tables (loca, hmtx). If the glyph id comes from a cmap this shouldn't happen
but it seems prudent to check for user errors here. The code does assume that data obtained
from the TTF file is valid otherwise (though the CheckTable method seeks to check for
obvious problems that might accompany a change in table versions). For example an invalid
offset in the loca table which could exceed the size of the glyf table is NOT trapped.
Likewise if numberOf_LongHorMetrics in the hhea table is wrong, this will NOT be trapped,
which could cause a lookup in the hmtx table to exceed the table length. Of course, TTF tables
that are completely corrupt will cause unpredictable results. */
/* Note on composite glyphs: Glyphs that have components that are themselves composites
are not supported. IsDeepComposite can be used to test for this. False is returned from many
of the methods in this cases. It is unclear how to build composite glyphs in some cases,
so this code represents my best guess until test cases can be found. See notes on the high-
level GlyfPoints method. */
namespace graphite2
{
namespace TtfUtil
{
/*----------------------------------------------------------------------------------------------
Get offset and size of the offset table needed to find table directory.
Return true if success, false otherwise.
lSize excludes any table directory entries.
----------------------------------------------------------------------------------------------*/
bool GetHeaderInfo(size_t & lOffset, size_t & lSize)
{
lOffset = 0;
lSize = offsetof(Sfnt::OffsetSubTable, table_directory);
assert(sizeof(uint32) + 4*sizeof (uint16) == lSize);
return true;
}
/*----------------------------------------------------------------------------------------------
Check the offset table for expected data.
Return true if success, false otherwise.
----------------------------------------------------------------------------------------------*/
bool CheckHeader(const void * pHdr)
{
const Sfnt::OffsetSubTable * pOffsetTable
= reinterpret_cast<const Sfnt::OffsetSubTable *>(pHdr);
return pHdr && be::swap(pOffsetTable->scaler_type) == Sfnt::OffsetSubTable::TrueTypeWin;
}
/*----------------------------------------------------------------------------------------------
Get offset and size of the table directory.
Return true if successful, false otherwise.
----------------------------------------------------------------------------------------------*/
bool GetTableDirInfo(const void * pHdr, size_t & lOffset, size_t & lSize)
{
const Sfnt::OffsetSubTable * pOffsetTable
= reinterpret_cast<const Sfnt::OffsetSubTable *>(pHdr);
lOffset = offsetof(Sfnt::OffsetSubTable, table_directory);
lSize = be::swap(pOffsetTable->num_tables)
* sizeof(Sfnt::OffsetSubTable::Entry);
return true;
}
/*----------------------------------------------------------------------------------------------
Get offset and size of the specified table.
Return true if successful, false otherwise. On false, offset and size will be 0.
----------------------------------------------------------------------------------------------*/
bool GetTableInfo(const Tag TableTag, const void * pHdr, const void * pTableDir,
size_t & lOffset, size_t & lSize)
{
const Sfnt::OffsetSubTable * pOffsetTable
= reinterpret_cast<const Sfnt::OffsetSubTable *>(pHdr);
const size_t num_tables = be::swap(pOffsetTable->num_tables);
const Sfnt::OffsetSubTable::Entry
* entry_itr = reinterpret_cast<const Sfnt::OffsetSubTable::Entry *>(
pTableDir),
* const dir_end = entry_itr + num_tables;
if (num_tables > 40)
return false;
for (;entry_itr != dir_end; ++entry_itr) // 40 - safe guard
{
if (be::swap(entry_itr->tag) == TableTag)
{
lOffset = be::swap(entry_itr->offset);
lSize = be::swap(entry_itr->length);
return true;
}
}
return false;
}
/*----------------------------------------------------------------------------------------------
Check the specified table. Tests depend on the table type.
Return true if successful, false otherwise.
----------------------------------------------------------------------------------------------*/
bool CheckTable(const Tag TableId, const void * pTable, size_t lTableSize)
{
using namespace Sfnt;
if (pTable == 0 || lTableSize < 4) return false;
switch(TableId)
{
case Tag::cmap: // cmap
{
const Sfnt::CharacterCodeMap * const pCmap
= reinterpret_cast<const Sfnt::CharacterCodeMap *>(pTable);
if (lTableSize < sizeof(Sfnt::CharacterCodeMap))
return false;
return be::swap(pCmap->version) == 0;
}
case Tag::head: // head
{
const Sfnt::FontHeader * const pHead
= reinterpret_cast<const Sfnt::FontHeader *>(pTable);
if (lTableSize < sizeof(Sfnt::FontHeader))
return false;
bool r = be::swap(pHead->version) == OneFix
&& be::swap(pHead->magic_number) == FontHeader::MagicNumber
&& be::swap(pHead->glyph_data_format)
== FontHeader::GlypDataFormat
&& (be::swap(pHead->index_to_loc_format)
== FontHeader::ShortIndexLocFormat
|| be::swap(pHead->index_to_loc_format)
== FontHeader::LongIndexLocFormat)
&& sizeof(FontHeader) <= lTableSize;
return r;
}
case Tag::post: // post
{
const Sfnt::PostScriptGlyphName * const pPost
= reinterpret_cast<const Sfnt::PostScriptGlyphName *>(pTable);
if (lTableSize < sizeof(Sfnt::PostScriptGlyphName))
return false;
const fixed format = be::swap(pPost->format);
bool r = format == PostScriptGlyphName::Format1
|| format == PostScriptGlyphName::Format2
|| format == PostScriptGlyphName::Format3
|| format == PostScriptGlyphName::Format25;
return r;
}
case Tag::hhea: // hhea
{
const Sfnt::HorizontalHeader * pHhea =
reinterpret_cast<const Sfnt::HorizontalHeader *>(pTable);
if (lTableSize < sizeof(Sfnt::HorizontalHeader))
return false;
bool r = be::swap(pHhea->version) == OneFix
&& be::swap(pHhea->metric_data_format) == 0
&& sizeof (Sfnt::HorizontalHeader) <= lTableSize;
return r;
}
case Tag::maxp: // maxp
{
const Sfnt::MaximumProfile * pMaxp =
reinterpret_cast<const Sfnt::MaximumProfile *>(pTable);
if (lTableSize < sizeof(Sfnt::MaximumProfile))
return false;
bool r = be::swap(pMaxp->version) == OneFix
&& sizeof(Sfnt::MaximumProfile) <= lTableSize;
return r;
}
case Tag::OS_2: // OS/2
{
const Sfnt::Compatibility * pOs2
= reinterpret_cast<const Sfnt::Compatibility *>(pTable);
if (be::swap(pOs2->version) == 0)
{ // OS/2 table version 1 size
// if (sizeof(Sfnt::Compatibility)
// - sizeof(uint32)*2 - sizeof(int16)*2
// - sizeof(uint16)*3 <= lTableSize)
if (sizeof(Sfnt::Compatibility0) <= lTableSize)
return true;
}
else if (be::swap(pOs2->version) == 1)
{ // OS/2 table version 2 size
// if (sizeof(Sfnt::Compatibility)
// - sizeof(int16) *2
// - sizeof(uint16)*3 <= lTableSize)
if (sizeof(Sfnt::Compatibility1) <= lTableSize)
return true;
}
else if (be::swap(pOs2->version) == 2)
{ // OS/2 table version 3 size
if (sizeof(Sfnt::Compatibility2) <= lTableSize)
return true;
}
else if (be::swap(pOs2->version) == 3 || be::swap(pOs2->version) == 4)
{ // OS/2 table version 4 size - version 4 changed the meaning of some fields which we don't use
if (sizeof(Sfnt::Compatibility3) <= lTableSize)
return true;
}
else
return false;
break;
}
case Tag::name:
{
const Sfnt::FontNames * pName
= reinterpret_cast<const Sfnt::FontNames *>(pTable);
if (lTableSize < sizeof(Sfnt::FontNames))
return false;
return be::swap(pName->format) == 0;
}
case Tag::glyf:
{
return (lTableSize >= sizeof(Sfnt::Glyph));
}
default:
break;
}
return true;
}
/*----------------------------------------------------------------------------------------------
Return the number of glyphs in the font. Should never be less than zero.
Note: this method is not currently used by the Graphite engine.
----------------------------------------------------------------------------------------------*/
size_t GlyphCount(const void * pMaxp)
{
const Sfnt::MaximumProfile * pTable =
reinterpret_cast<const Sfnt::MaximumProfile *>(pMaxp);
return be::swap(pTable->num_glyphs);
}
#ifdef ALL_TTFUTILS
/*----------------------------------------------------------------------------------------------
Return the maximum number of components for any composite glyph in the font.
Note: this method is not currently used by the Graphite engine.
----------------------------------------------------------------------------------------------*/
size_t MaxCompositeComponentCount(const void * pMaxp)
{
const Sfnt::MaximumProfile * pTable =
reinterpret_cast<const Sfnt::MaximumProfile *>(pMaxp);
return be::swap(pTable->max_component_elements);
}
/*----------------------------------------------------------------------------------------------
Composite glyphs can be composed of glyphs that are themselves composites.
This method returns the maximum number of levels like this for any glyph in the font.
A non-composite glyph has a level of 1.
Note: this method is not currently used by the Graphite engine.
----------------------------------------------------------------------------------------------*/
size_t MaxCompositeLevelCount(const void * pMaxp)
{
const Sfnt::MaximumProfile * pTable =
reinterpret_cast<const Sfnt::MaximumProfile *>(pMaxp);
return be::swap(pTable->max_component_depth);
}
/*----------------------------------------------------------------------------------------------
Return the number of glyphs in the font according to a differt source.
Should never be less than zero. Return -1 on failure.
Note: this method is not currently used by the Graphite engine.
----------------------------------------------------------------------------------------------*/
size_t LocaGlyphCount(size_t lLocaSize, const void * pHead) //throw(std::domain_error)
{
const Sfnt::FontHeader * pTable
= reinterpret_cast<const Sfnt::FontHeader *>(pHead);
if (be::swap(pTable->index_to_loc_format)
== Sfnt::FontHeader::ShortIndexLocFormat)
// loca entries are two bytes and have been divided by two
return (lLocaSize >> 1) - 1;
if (be::swap(pTable->index_to_loc_format)
== Sfnt::FontHeader::LongIndexLocFormat)
// loca entries are four bytes
return (lLocaSize >> 2) - 1;
return -1;
//throw std::domain_error("head table in inconsistent state. The font may be corrupted");
}
#endif
/*----------------------------------------------------------------------------------------------
Return the design units the font is designed with
----------------------------------------------------------------------------------------------*/
int DesignUnits(const void * pHead)
{
const Sfnt::FontHeader * pTable =
reinterpret_cast<const Sfnt::FontHeader *>(pHead);
return be::swap(pTable->units_per_em);
}
#ifdef ALL_TTFUTILS
/*----------------------------------------------------------------------------------------------
Return the checksum from the head table, which serves as a unique identifer for the font.
----------------------------------------------------------------------------------------------*/
int HeadTableCheckSum(const void * pHead)
{
const Sfnt::FontHeader * pTable =
reinterpret_cast<const Sfnt::FontHeader *>(pHead);
return be::swap(pTable->check_sum_adjustment);
}
/*----------------------------------------------------------------------------------------------
Return the create time from the head table. This consists of a 64-bit integer, which
we return here as two 32-bit integers.
Note: this method is not currently used by the Graphite engine.
----------------------------------------------------------------------------------------------*/
void HeadTableCreateTime(const void * pHead,
unsigned int * pnDateBC, unsigned int * pnDateAD)
{
const Sfnt::FontHeader * pTable =
reinterpret_cast<const Sfnt::FontHeader *>(pHead);
*pnDateBC = be::swap(pTable->created[0]);
*pnDateAD = be::swap(pTable->created[1]);
}
/*----------------------------------------------------------------------------------------------
Return the modify time from the head table.This consists of a 64-bit integer, which
we return here as two 32-bit integers.
Note: this method is not currently used by the Graphite engine.
----------------------------------------------------------------------------------------------*/
void HeadTableModifyTime(const void * pHead,
unsigned int * pnDateBC, unsigned int *pnDateAD)
{
const Sfnt::FontHeader * pTable =
reinterpret_cast<const Sfnt::FontHeader *>(pHead);
;
*pnDateBC = be::swap(pTable->modified[0]);
*pnDateAD = be::swap(pTable->modified[1]);
}
/*----------------------------------------------------------------------------------------------
Return true if the font is italic.
----------------------------------------------------------------------------------------------*/
bool IsItalic(const void * pHead)
{
const Sfnt::FontHeader * pTable =
reinterpret_cast<const Sfnt::FontHeader *>(pHead);
return ((be::swap(pTable->mac_style) & 0x00000002) != 0);
}
/*----------------------------------------------------------------------------------------------
Return the ascent for the font
----------------------------------------------------------------------------------------------*/
int FontAscent(const void * pOs2)
{
const Sfnt::Compatibility * pTable = reinterpret_cast<const Sfnt::Compatibility *>(pOs2);
return be::swap(pTable->win_ascent);
}
/*----------------------------------------------------------------------------------------------
Return the descent for the font
----------------------------------------------------------------------------------------------*/
int FontDescent(const void * pOs2)
{
const Sfnt::Compatibility * pTable = reinterpret_cast<const Sfnt::Compatibility *>(pOs2);
return be::swap(pTable->win_descent);
}
/*----------------------------------------------------------------------------------------------
Get the bold and italic style bits.
Return true if successful. false otherwise.
In addition to checking the OS/2 table, one could also check
the head table's macStyle field (overridden by the OS/2 table on Win)
the sub-family name in the name table (though this can contain oblique, dark, etc too)
----------------------------------------------------------------------------------------------*/
bool FontOs2Style(const void *pOs2, bool & fBold, bool & fItalic)
{
const Sfnt::Compatibility * pTable = reinterpret_cast<const Sfnt::Compatibility *>(pOs2);
fBold = (be::swap(pTable->fs_selection) & Sfnt::Compatibility::Bold) != 0;
fItalic = (be::swap(pTable->fs_selection) & Sfnt::Compatibility::Italic) != 0;
return true;
}
#endif
/*----------------------------------------------------------------------------------------------
Method for searching name table.
----------------------------------------------------------------------------------------------*/
bool GetNameInfo(const void * pName, int nPlatformId, int nEncodingId,
int nLangId, int nNameId, size_t & lOffset, size_t & lSize)
{
lOffset = 0;
lSize = 0;
const Sfnt::FontNames * pTable = reinterpret_cast<const Sfnt::FontNames *>(pName);
uint16 cRecord = be::swap(pTable->count);
uint16 nRecordOffset = be::swap(pTable->string_offset);
const Sfnt::NameRecord * pRecord = reinterpret_cast<const Sfnt::NameRecord *>(pTable + 1);
for (int i = 0; i < cRecord; ++i)
{
if (be::swap(pRecord->platform_id) == nPlatformId &&
be::swap(pRecord->platform_specific_id) == nEncodingId &&
be::swap(pRecord->language_id) == nLangId &&
be::swap(pRecord->name_id) == nNameId)
{
lOffset = be::swap(pRecord->offset) + nRecordOffset;
lSize = be::swap(pRecord->length);
return true;
}
pRecord++;
}
return false;
}
#ifdef ALL_TTFUTILS
/*----------------------------------------------------------------------------------------------
Return all the lang-IDs that have data for the given name-IDs. Assume that there is room
in the return array (langIdList) for 128 items. The purpose of this method is to return
a list of all possible lang-IDs.
----------------------------------------------------------------------------------------------*/
int GetLangsForNames(const void * pName, int nPlatformId, int nEncodingId,
int * nameIdList, int cNameIds, short * langIdList)
{
const Sfnt::FontNames * pTable = reinterpret_cast<const Sfnt::FontNames *>(pName);
int cLangIds = 0;
uint16 cRecord = be::swap(pTable->count);
if (cRecord > 127) return cLangIds;
//uint16 nRecordOffset = swapw(pTable->stringOffset);
const Sfnt::NameRecord * pRecord = reinterpret_cast<const Sfnt::NameRecord *>(pTable + 1);
for (int i = 0; i < cRecord; ++i)
{
if (be::swap(pRecord->platform_id) == nPlatformId &&
be::swap(pRecord->platform_specific_id) == nEncodingId)
{
bool fNameFound = false;
int nLangId = be::swap(pRecord->language_id);
int nNameId = be::swap(pRecord->name_id);
for (int j = 0; j < cNameIds; j++)
{
if (nNameId == nameIdList[j])
{
fNameFound = true;
break;
}
}
if (fNameFound)
{
// Add it if it's not there.
int ilang;
for (ilang = 0; ilang < cLangIds; ilang++)
if (langIdList[ilang] == nLangId)
break;
if (ilang >= cLangIds)
{
langIdList[cLangIds] = short(nLangId);
cLangIds++;
}
if (cLangIds == 128)
return cLangIds;
}
}
pRecord++;
}
return cLangIds;
}
/*----------------------------------------------------------------------------------------------
Get the offset and size of the font family name in English for the MS Platform with Unicode
writing system. The offset is within the pName data. The string is double byte with MSB
first.
----------------------------------------------------------------------------------------------*/
bool Get31EngFamilyInfo(const void * pName, size_t & lOffset, size_t & lSize)
{
return GetNameInfo(pName, Sfnt::NameRecord::Microsoft, 1, 1033,
Sfnt::NameRecord::Family, lOffset, lSize);
}
/*----------------------------------------------------------------------------------------------
Get the offset and size of the full font name in English for the MS Platform with Unicode
writing system. The offset is within the pName data. The string is double byte with MSB
first.
Note: this method is not currently used by the Graphite engine.
----------------------------------------------------------------------------------------------*/
bool Get31EngFullFontInfo(const void * pName, size_t & lOffset, size_t & lSize)
{
return GetNameInfo(pName, Sfnt::NameRecord::Microsoft, 1, 1033,
Sfnt::NameRecord::Fullname, lOffset, lSize);
}
/*----------------------------------------------------------------------------------------------
Get the offset and size of the font family name in English for the MS Platform with Symbol
writing system. The offset is within the pName data. The string is double byte with MSB
first.
----------------------------------------------------------------------------------------------*/
bool Get30EngFamilyInfo(const void * pName, size_t & lOffset, size_t & lSize)
{
return GetNameInfo(pName, Sfnt::NameRecord::Microsoft, 0, 1033,
Sfnt::NameRecord::Family, lOffset, lSize);
}
/*----------------------------------------------------------------------------------------------
Get the offset and size of the full font name in English for the MS Platform with Symbol
writing system. The offset is within the pName data. The string is double byte with MSB
first.
Note: this method is not currently used by the Graphite engine.
----------------------------------------------------------------------------------------------*/
bool Get30EngFullFontInfo(const void * pName, size_t & lOffset, size_t & lSize)
{
return GetNameInfo(pName, Sfnt::NameRecord::Microsoft, 0, 1033,
Sfnt::NameRecord::Fullname, lOffset, lSize);
}
/*----------------------------------------------------------------------------------------------
Return the Glyph ID for a given Postscript name. This method finds the first glyph which
matches the requested Postscript name. Ideally every glyph should have a unique Postscript
name (except for special names such as .notdef), but this is not always true.
On failure return value less than zero.
-1 - table search failed
-2 - format 3 table (no Postscript glyph info)
-3 - other failures
Note: this method is not currently used by the Graphite engine.
----------------------------------------------------------------------------------------------*/
int PostLookup(const void * pPost, size_t lPostSize, const void * pMaxp,
const char * pPostName)
{
using namespace Sfnt;
const Sfnt::PostScriptGlyphName * pTable
= reinterpret_cast<const Sfnt::PostScriptGlyphName *>(pPost);
fixed format = be::swap(pTable->format);
if (format == PostScriptGlyphName::Format3)
{ // format 3 - no Postscript glyph info in font
return -2;
}
// search for given Postscript name among the standard names
int iPostName = -1; // index in standard names
for (int i = 0; i < kcPostNames; i++)
{
if (!strcmp(pPostName, rgPostName[i]))
{
iPostName = i;
break;
}
}
if (format == PostScriptGlyphName::Format1)
{ // format 1 - use standard Postscript names
return iPostName;
}
if (format == PostScriptGlyphName::Format25)
{
if (iPostName == -1)
return -1;
const PostScriptGlyphName25 * pTable25
= static_cast<const PostScriptGlyphName25 *>(pTable);
int cnGlyphs = GlyphCount(pMaxp);
for (gid16 nGlyphId = 0; nGlyphId < cnGlyphs && nGlyphId < kcPostNames;
nGlyphId++)
{ // glyph_name_index25 contains bytes so no byte swapping needed
// search for first glyph id that uses the standard name
if (nGlyphId + pTable25->offset[nGlyphId] == iPostName)
return nGlyphId;
}
}
if (format == PostScriptGlyphName::Format2)
{ // format 2
const PostScriptGlyphName2 * pTable2
= static_cast<const PostScriptGlyphName2 *>(pTable);
int cnGlyphs = be::swap(pTable2->number_of_glyphs);
if (iPostName != -1)
{ // did match a standard name, look for first glyph id mapped to that name
for (gid16 nGlyphId = 0; nGlyphId < cnGlyphs; nGlyphId++)
{
if (be::swap(pTable2->glyph_name_index[nGlyphId]) == iPostName)
return nGlyphId;
}
}
{ // did not match a standard name, search font specific names
size_t nStrSizeGoal = strlen(pPostName);
const char * pFirstGlyphName = reinterpret_cast<const char *>(
&pTable2->glyph_name_index[0] + cnGlyphs);
const char * pGlyphName = pFirstGlyphName;
int iInNames = 0; // index in font specific names
bool fFound = false;
const char * const endOfTable
= reinterpret_cast<const char *>(pTable2) + lPostSize;
while (pGlyphName < endOfTable && !fFound)
{ // search Pascal strings for first matching name
size_t nStringSize = size_t(*pGlyphName);
if (nStrSizeGoal != nStringSize ||
strncmp(pGlyphName + 1, pPostName, nStringSize))
{ // did not match
++iInNames;
pGlyphName += nStringSize + 1;
}
else
{ // did match
fFound = true;
}
}
if (!fFound)
return -1; // no font specific name matches request
iInNames += kcPostNames;
for (gid16 nGlyphId = 0; nGlyphId < cnGlyphs; nGlyphId++)
{ // search for first glyph id that maps to the found string index
if (be::swap(pTable2->glyph_name_index[nGlyphId]) == iInNames)
return nGlyphId;
}
return -1; // no glyph mapped to this index (very strange)
}
}
return -3;
}
/*----------------------------------------------------------------------------------------------
Convert a Unicode character string from big endian (MSB first, Motorola) format to little
endian (LSB first, Intel) format.
nSize is the number of Unicode characters in the string. It should not include any
terminating null. If nSize is 0, it is assumed the string is null terminated. nSize
defaults to 0.
Return true if successful, false otherwise.
----------------------------------------------------------------------------------------------*/
void SwapWString(void * pWStr, size_t nSize /* = 0 */) //throw (std::invalid_argument)
{
if (pWStr == 0)
{
// throw std::invalid_argument("null pointer given");
return;
}
uint16 * pStr = reinterpret_cast<uint16 *>(pWStr);
uint16 * const pStrEnd = pStr + (nSize == 0 ? wcslen((const wchar_t*)pStr) : nSize);
for (; pStr != pStrEnd; ++pStr)
*pStr = be::swap(*pStr);
// std::transform(pStr, pStrEnd, pStr, read<uint16>);
// for (int i = 0; i < nSize; i++)
// { // swap the wide characters in the string
// pStr[i] = utf16(be::swap(uint16(pStr[i])));
// }
}
#endif
/*----------------------------------------------------------------------------------------------
Get the left-side bearing and and advance width based on the given tables and Glyph ID
Return true if successful, false otherwise. On false, one or both value could be INT_MIN
----------------------------------------------------------------------------------------------*/
bool HorMetrics(gid16 nGlyphId, const void * pHmtx, size_t lHmtxSize, const void * pHhea,
int & nLsb, unsigned int & nAdvWid)
{
const Sfnt::HorizontalMetric * phmtx =
reinterpret_cast<const Sfnt::HorizontalMetric *>(pHmtx);
const Sfnt::HorizontalHeader * phhea =
reinterpret_cast<const Sfnt::HorizontalHeader *>(pHhea);
size_t cLongHorMetrics = be::swap(phhea->num_long_hor_metrics);
if (nGlyphId < cLongHorMetrics)
{ // glyph id is acceptable
if ((nGlyphId + 1) * sizeof(Sfnt::HorizontalMetric) > lHmtxSize) return false;
nAdvWid = be::swap(phmtx[nGlyphId].advance_width);
nLsb = be::swap(phmtx[nGlyphId].left_side_bearing);
}
else
{
// guard against bad glyph id
size_t lLsbOffset = sizeof(Sfnt::HorizontalMetric) * cLongHorMetrics +
sizeof(int16) * (nGlyphId - cLongHorMetrics); // offset in bytes
// We test like this as LsbOffset is an offset not a length.
if (lLsbOffset >= lHmtxSize - sizeof(int16) || cLongHorMetrics == 0)
{
nLsb = 0;
return false;
}
nAdvWid = be::swap(phmtx[cLongHorMetrics - 1].advance_width);
nLsb = be::peek<int16>(reinterpret_cast<const byte *>(phmtx) + lLsbOffset);
}
return true;
}
/*----------------------------------------------------------------------------------------------
Return a pointer to the requested cmap subtable. By default find the Microsoft Unicode
subtable. Pass nEncoding as -1 to find first table that matches only nPlatformId.
Return NULL if the subtable cannot be found.
----------------------------------------------------------------------------------------------*/
const void * FindCmapSubtable(const void * pCmap, int nPlatformId, /* =3 */ int nEncodingId, /* = 1 */ size_t length)
{
const Sfnt::CharacterCodeMap * pTable = reinterpret_cast<const Sfnt::CharacterCodeMap *>(pCmap);
uint16 csuPlatforms = be::swap(pTable->num_subtables);
if (length && (sizeof(Sfnt::CharacterCodeMap) + 8 * (csuPlatforms - 1) > length))
return NULL;
for (int i = 0; i < csuPlatforms; i++)
{
if (be::swap(pTable->encoding[i].platform_id) == nPlatformId &&
(nEncodingId == -1 || be::swap(pTable->encoding[i].platform_specific_id) == nEncodingId))
{
uint32 offset = be::swap(pTable->encoding[i].offset);
const uint8 * pRtn = reinterpret_cast<const uint8 *>(pCmap) + offset;
if (length)
{
if (offset > length - 2) return NULL;
uint16 format = be::read<uint16>(pRtn);
if (format == 4)
{
if (offset > length - 4) return NULL;
uint16 subTableLength = be::peek<uint16>(pRtn);
if (i + 1 == csuPlatforms)
{
if (subTableLength > length - offset)
return NULL;
}
else if (subTableLength > be::swap(pTable->encoding[i+1].offset))
return NULL;
}
if (format == 12)
{
if (offset > length - 6) return NULL;
uint32 subTableLength = be::peek<uint32>(pRtn);
if (i + 1 == csuPlatforms)
{
if (subTableLength > length - offset)
return NULL;
}
else if (subTableLength > be::swap(pTable->encoding[i+1].offset))
return NULL;
}
}
return reinterpret_cast<const uint8 *>(pCmap) + offset;
}
}
return 0;
}
/*----------------------------------------------------------------------------------------------
Check the Microsoft Unicode subtable for expected values
----------------------------------------------------------------------------------------------*/
bool CheckCmapSubtable4(const void * pCmapSubtable4, const void * pCmapEnd /*, unsigned int maxgid*/)
{
size_t table_len = (const byte *)pCmapEnd - (const byte *)pCmapSubtable4;
if (!pCmapSubtable4) return false;
const Sfnt::CmapSubTable * pTable = reinterpret_cast<const Sfnt::CmapSubTable *>(pCmapSubtable4);
// Bob H say some freeware TT fonts have version 1 (eg, CALIGULA.TTF)
// so don't check subtable version. 21 Mar 2002 spec changes version to language.
if (table_len < sizeof(*pTable) || be::swap(pTable->format) != 4) return false;
const Sfnt::CmapSubTableFormat4 * pTable4 = reinterpret_cast<const Sfnt::CmapSubTableFormat4 *>(pCmapSubtable4);
if (table_len < sizeof(*pTable4))
return false;
uint16 length = be::swap(pTable4->length);
if (length > table_len)
return false;
if (length < sizeof(Sfnt::CmapSubTableFormat4))
return false;
uint16 nRanges = be::swap(pTable4->seg_count_x2) >> 1;
if (!nRanges || length < sizeof(Sfnt::CmapSubTableFormat4) + 4 * nRanges * sizeof(uint16))
return false;
// check last range is properly terminated
uint16 chEnd = be::peek<uint16>(pTable4->end_code + nRanges - 1);
if (chEnd != 0xFFFF)
return false;
#if 0
int lastend = -1;
for (int i = 0; i < nRanges; ++i)
{
uint16 end = be::peek<uint16>(pTable4->end_code + i);
uint16 start = be::peek<uint16>(pTable4->end_code + nRanges + 1 + i);
int16 delta = be::peek<int16>(pTable4->end_code + 2*nRanges + 1 + i);
uint16 offset = be::peek<uint16>(pTable4->end_code + 3*nRanges + 1 + i);
if (lastend >= end || lastend >= start)
return false;
if (offset)
{
const uint16 *gstart = pTable4->end_code + 3*nRanges + 1 + i + (offset >> 1);
const uint16 *gend = gstart + end - start;
if ((char *)gend >= (char *)pCmapSubtable4 + length)
return false;
while (gstart <= gend)
{
uint16 g = be::peek<uint16>(gstart++);
if (g && ((g + delta) & 0xFFFF) > maxgid)
return false;
}
}
else if (((delta + end) & 0xFFFF) > maxgid)
return false;
lastend = end;
}
#endif
return true;
}
/*----------------------------------------------------------------------------------------------
Return the Glyph ID for the given Unicode ID in the Microsoft Unicode subtable.
(Actually this code only depends on subtable being format 4.)
Return 0 if the Unicode ID is not in the subtable.
----------------------------------------------------------------------------------------------*/
gid16 CmapSubtable4Lookup(const void * pCmapSubtabel4, unsigned int nUnicodeId, int rangeKey)
{
const Sfnt::CmapSubTableFormat4 * pTable = reinterpret_cast<const Sfnt::CmapSubTableFormat4 *>(pCmapSubtabel4);
uint16 nSeg = be::swap(pTable->seg_count_x2) >> 1;
uint16 n;
const uint16 * pLeft, * pMid;
uint16 cMid, chStart, chEnd;
if (rangeKey)
{
pMid = &(pTable->end_code[rangeKey]);
chEnd = be::peek<uint16>(pMid);
}
else
{
// Binary search of the endCode[] array
pLeft = &(pTable->end_code[0]);
n = nSeg;
while (n > 0)
{
cMid = n >> 1; // Pick an element in the middle
pMid = pLeft + cMid;
chEnd = be::peek<uint16>(pMid);
if (nUnicodeId <= chEnd)
{
if (cMid == 0 || nUnicodeId > be::peek<uint16>(pMid -1))
break; // Must be this seg or none!
n = cMid; // Continue on left side, omitting mid point
}
else
{
pLeft = pMid + 1; // Continue on right side, omitting mid point
n -= (cMid + 1);
}
}
if (!n)
return 0;
}
// Ok, we're down to one segment and pMid points to the endCode element
// Either this is it or none is.