ref: ec9b6c314dc018bbf0af4ff657fa5ff56a5bf9f7
dir: /src/sfnt/ttload.c/
/****************************************************************************
*
* ttload.c
*
* Load the basic TrueType tables, i.e., tables that can be either in
* TTF or OTF fonts (body).
*
* Copyright (C) 1996-2020 by
* David Turner, Robert Wilhelm, and Werner Lemberg.
*
* This file is part of the FreeType project, and may only be used,
* modified, and distributed under the terms of the FreeType project
* license, LICENSE.TXT. By continuing to use, modify, or distribute
* this file you indicate that you have read the license and
* understand and accept it fully.
*
*/
#include <freetype/internal/ftdebug.h>
#include <freetype/internal/ftstream.h>
#include <freetype/tttags.h>
#include "ttload.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 ttload
/**************************************************************************
*
* @Function:
* tt_face_lookup_table
*
* @Description:
* Looks for a TrueType table by name.
*
* @Input:
* face ::
* A face object handle.
*
* tag ::
* The searched tag.
*
* @Return:
* A pointer to the table directory entry. 0 if not found.
*/
FT_LOCAL_DEF( TT_Table )
tt_face_lookup_table( TT_Face face,
FT_ULong tag )
{
TT_Table entry;
TT_Table limit;
#ifdef FT_DEBUG_LEVEL_TRACE
FT_Bool zero_length = FALSE;
#endif
FT_TRACE4(( "tt_face_lookup_table: %p, `%c%c%c%c' -- ",
(void *)face,
(FT_Char)( tag >> 24 ),
(FT_Char)( tag >> 16 ),
(FT_Char)( tag >> 8 ),
(FT_Char)( tag ) ));
entry = face->dir_tables;
limit = entry + face->num_tables;
for ( ; entry < limit; entry++ )
{
/* For compatibility with Windows, we consider */
/* zero-length tables the same as missing tables. */
if ( entry->Tag == tag )
{
if ( entry->Length != 0 )
{
FT_TRACE4(( "found table.\n" ));
return entry;
}
#ifdef FT_DEBUG_LEVEL_TRACE
zero_length = TRUE;
#endif
}
}
#ifdef FT_DEBUG_LEVEL_TRACE
if ( zero_length )
FT_TRACE4(( "ignoring empty table\n" ));
else
FT_TRACE4(( "could not find table\n" ));
#endif
return NULL;
}
/**************************************************************************
*
* @Function:
* tt_face_goto_table
*
* @Description:
* Looks for a TrueType table by name, then seek a stream to it.
*
* @Input:
* face ::
* A face object handle.
*
* tag ::
* The searched tag.
*
* stream ::
* The stream to seek when the table is found.
*
* @Output:
* length ::
* The length of the table if found, undefined otherwise.
*
* @Return:
* FreeType error code. 0 means success.
*/
FT_LOCAL_DEF( FT_Error )
tt_face_goto_table( TT_Face face,
FT_ULong tag,
FT_Stream stream,
FT_ULong* length )
{
TT_Table table;
FT_Error error;
table = tt_face_lookup_table( face, tag );
if ( table )
{
if ( length )
*length = table->Length;
if ( FT_STREAM_SEEK( table->Offset ) )
goto Exit;
}
else
error = FT_THROW( Table_Missing );
Exit:
return error;
}
/* Here, we */
/* */
/* - check that `num_tables' is valid (and adjust it if necessary); */
/* also return the number of valid table entries */
/* */
/* - look for a `head' table, check its size, and parse it to check */
/* whether its `magic' field is correctly set */
/* */
/* - errors (except errors returned by stream handling) */
/* */
/* SFNT_Err_Unknown_File_Format: */
/* no table is defined in directory, it is not sfnt-wrapped */
/* data */
/* SFNT_Err_Table_Missing: */
/* table directory is valid, but essential tables */
/* (head/bhed/SING) are missing */
/* */
static FT_Error
check_table_dir( SFNT_Header sfnt,
FT_Stream stream,
FT_UShort* valid )
{
FT_Error error;
FT_UShort nn, valid_entries = 0;
FT_UInt has_head = 0, has_sing = 0, has_meta = 0;
FT_ULong offset = sfnt->offset + 12;
static const FT_Frame_Field table_dir_entry_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE TT_TableRec
FT_FRAME_START( 16 ),
FT_FRAME_ULONG( Tag ),
FT_FRAME_ULONG( CheckSum ),
FT_FRAME_ULONG( Offset ),
FT_FRAME_ULONG( Length ),
FT_FRAME_END
};
if ( FT_STREAM_SEEK( offset ) )
goto Exit;
for ( nn = 0; nn < sfnt->num_tables; nn++ )
{
TT_TableRec table;
if ( FT_STREAM_READ_FIELDS( table_dir_entry_fields, &table ) )
{
nn--;
FT_TRACE2(( "check_table_dir:"
" can read only %d table%s in font (instead of %d)\n",
nn, nn == 1 ? "" : "s", sfnt->num_tables ));
sfnt->num_tables = nn;
break;
}
/* we ignore invalid tables */
if ( table.Offset > stream->size )
{
FT_TRACE2(( "check_table_dir: table entry %d invalid\n", nn ));
continue;
}
else if ( table.Length > stream->size - table.Offset )
{
/* Some tables have such a simple structure that clipping its */
/* contents is harmless. This also makes FreeType less sensitive */
/* to invalid table lengths (which programs like Acroread seem to */
/* ignore in general). */
if ( table.Tag == TTAG_hmtx ||
table.Tag == TTAG_vmtx )
valid_entries++;
else
{
FT_TRACE2(( "check_table_dir: table entry %d invalid\n", nn ));
continue;
}
}
else
valid_entries++;
if ( table.Tag == TTAG_head || table.Tag == TTAG_bhed )
{
FT_UInt32 magic;
#ifndef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
if ( table.Tag == TTAG_head )
#endif
has_head = 1;
/*
* The table length should be 0x36, but certain font tools make it
* 0x38, so we will just check that it is greater.
*
* Note that according to the specification, the table must be
* padded to 32-bit lengths, but this doesn't apply to the value of
* its `Length' field!
*
*/
if ( table.Length < 0x36 )
{
FT_TRACE2(( "check_table_dir:"
" `head' or `bhed' table too small\n" ));
error = FT_THROW( Table_Missing );
goto Exit;
}
if ( FT_STREAM_SEEK( table.Offset + 12 ) ||
FT_READ_ULONG( magic ) )
goto Exit;
if ( magic != 0x5F0F3CF5UL )
FT_TRACE2(( "check_table_dir:"
" invalid magic number in `head' or `bhed' table\n"));
if ( FT_STREAM_SEEK( offset + ( nn + 1 ) * 16 ) )
goto Exit;
}
else if ( table.Tag == TTAG_SING )
has_sing = 1;
else if ( table.Tag == TTAG_META )
has_meta = 1;
}
*valid = valid_entries;
if ( !valid_entries )
{
FT_TRACE2(( "check_table_dir: no valid tables found\n" ));
error = FT_THROW( Unknown_File_Format );
goto Exit;
}
/* if `sing' and `meta' tables are present, there is no `head' table */
if ( has_head || ( has_sing && has_meta ) )
{
error = FT_Err_Ok;
goto Exit;
}
else
{
FT_TRACE2(( "check_table_dir:" ));
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
FT_TRACE2(( " neither `head', `bhed', nor `sing' table found\n" ));
#else
FT_TRACE2(( " neither `head' nor `sing' table found\n" ));
#endif
error = FT_THROW( Table_Missing );
}
Exit:
return error;
}
/**************************************************************************
*
* @Function:
* tt_face_load_font_dir
*
* @Description:
* Loads the header of a SFNT font file.
*
* @Input:
* face ::
* A handle to the target face object.
*
* stream ::
* The input stream.
*
* @Output:
* sfnt ::
* The SFNT header.
*
* @Return:
* FreeType error code. 0 means success.
*
* @Note:
* The stream cursor must be at the beginning of the font directory.
*/
FT_LOCAL_DEF( FT_Error )
tt_face_load_font_dir( TT_Face face,
FT_Stream stream )
{
SFNT_HeaderRec sfnt;
FT_Error error;
FT_Memory memory = stream->memory;
FT_UShort nn, valid_entries = 0;
static const FT_Frame_Field offset_table_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE SFNT_HeaderRec
FT_FRAME_START( 8 ),
FT_FRAME_USHORT( num_tables ),
FT_FRAME_USHORT( search_range ),
FT_FRAME_USHORT( entry_selector ),
FT_FRAME_USHORT( range_shift ),
FT_FRAME_END
};
FT_TRACE2(( "tt_face_load_font_dir: %p\n", (void *)face ));
/* read the offset table */
sfnt.offset = FT_STREAM_POS();
if ( FT_READ_ULONG( sfnt.format_tag ) ||
FT_STREAM_READ_FIELDS( offset_table_fields, &sfnt ) )
goto Exit;
/* many fonts don't have these fields set correctly */
#if 0
if ( sfnt.search_range != 1 << ( sfnt.entry_selector + 4 ) ||
sfnt.search_range + sfnt.range_shift != sfnt.num_tables << 4 )
return FT_THROW( Unknown_File_Format );
#endif
/* load the table directory */
FT_TRACE2(( "-- Number of tables: %10u\n", sfnt.num_tables ));
FT_TRACE2(( "-- Format version: 0x%08lx\n", sfnt.format_tag ));
if ( sfnt.format_tag != TTAG_OTTO )
{
/* check first */
error = check_table_dir( &sfnt, stream, &valid_entries );
if ( error )
{
FT_TRACE2(( "tt_face_load_font_dir:"
" invalid table directory for TrueType\n" ));
goto Exit;
}
}
else
{
valid_entries = sfnt.num_tables;
if ( !valid_entries )
{
FT_TRACE2(( "tt_face_load_font_dir: no valid tables found\n" ));
error = FT_THROW( Unknown_File_Format );
goto Exit;
}
}
face->num_tables = valid_entries;
face->format_tag = sfnt.format_tag;
if ( FT_QNEW_ARRAY( face->dir_tables, face->num_tables ) )
goto Exit;
if ( FT_STREAM_SEEK( sfnt.offset + 12 ) ||
FT_FRAME_ENTER( sfnt.num_tables * 16L ) )
goto Exit;
FT_TRACE2(( "\n" ));
FT_TRACE2(( " tag offset length checksum\n" ));
FT_TRACE2(( " ----------------------------------\n" ));
valid_entries = 0;
for ( nn = 0; nn < sfnt.num_tables; nn++ )
{
TT_TableRec entry;
FT_UShort i;
FT_Bool duplicate;
entry.Tag = FT_GET_TAG4();
entry.CheckSum = FT_GET_ULONG();
entry.Offset = FT_GET_ULONG();
entry.Length = FT_GET_ULONG();
/* ignore invalid tables that can't be sanitized */
if ( entry.Offset > stream->size )
continue;
else if ( entry.Length > stream->size - entry.Offset )
{
if ( entry.Tag == TTAG_hmtx ||
entry.Tag == TTAG_vmtx )
{
#ifdef FT_DEBUG_LEVEL_TRACE
FT_ULong old_length = entry.Length;
#endif
/* make metrics table length a multiple of 4 */
entry.Length = ( stream->size - entry.Offset ) & ~3U;
FT_TRACE2(( " %c%c%c%c %08lx %08lx %08lx"
" (sanitized; original length %08lx)",
(FT_Char)( entry.Tag >> 24 ),
(FT_Char)( entry.Tag >> 16 ),
(FT_Char)( entry.Tag >> 8 ),
(FT_Char)( entry.Tag ),
entry.Offset,
entry.Length,
entry.CheckSum,
old_length ));
}
else
continue;
}
#ifdef FT_DEBUG_LEVEL_TRACE
else
FT_TRACE2(( " %c%c%c%c %08lx %08lx %08lx",
(FT_Char)( entry.Tag >> 24 ),
(FT_Char)( entry.Tag >> 16 ),
(FT_Char)( entry.Tag >> 8 ),
(FT_Char)( entry.Tag ),
entry.Offset,
entry.Length,
entry.CheckSum ));
#endif
/* ignore duplicate tables – the first one wins */
duplicate = 0;
for ( i = 0; i < valid_entries; i++ )
{
if ( face->dir_tables[i].Tag == entry.Tag )
{
duplicate = 1;
break;
}
}
if ( duplicate )
{
FT_TRACE2(( " (duplicate, ignored)\n" ));
continue;
}
else
{
FT_TRACE2(( "\n" ));
/* we finally have a valid entry */
face->dir_tables[valid_entries++] = entry;
}
}
/* final adjustment to number of tables */
face->num_tables = valid_entries;
FT_FRAME_EXIT();
FT_TRACE2(( "table directory loaded\n" ));
FT_TRACE2(( "\n" ));
Exit:
return error;
}
/**************************************************************************
*
* @Function:
* tt_face_load_any
*
* @Description:
* Loads any font table into client memory.
*
* @Input:
* face ::
* The face object to look for.
*
* tag ::
* The tag of table to load. Use the value 0 if you want
* to access the whole font file, else set this parameter
* to a valid TrueType table tag that you can forge with
* the MAKE_TT_TAG macro.
*
* offset ::
* The starting offset in the table (or the file if
* tag == 0).
*
* length ::
* The address of the decision variable:
*
* If length == NULL:
* Loads the whole table. Returns an error if
* `offset' == 0!
*
* If *length == 0:
* Exits immediately; returning the length of the given
* table or of the font file, depending on the value of
* `tag'.
*
* If *length != 0:
* Loads the next `length' bytes of table or font,
* starting at offset `offset' (in table or font too).
*
* @Output:
* buffer ::
* The address of target buffer.
*
* @Return:
* FreeType error code. 0 means success.
*/
FT_LOCAL_DEF( FT_Error )
tt_face_load_any( TT_Face face,
FT_ULong tag,
FT_Long offset,
FT_Byte* buffer,
FT_ULong* length )
{
FT_Error error;
FT_Stream stream;
TT_Table table;
FT_ULong size;
if ( tag != 0 )
{
/* look for tag in font directory */
table = tt_face_lookup_table( face, tag );
if ( !table )
{
error = FT_THROW( Table_Missing );
goto Exit;
}
offset += table->Offset;
size = table->Length;
}
else
/* tag == 0 -- the user wants to access the font file directly */
size = face->root.stream->size;
if ( length && *length == 0 )
{
*length = size;
return FT_Err_Ok;
}
if ( length )
size = *length;
stream = face->root.stream;
/* the `if' is syntactic sugar for picky compilers */
if ( FT_STREAM_READ_AT( offset, buffer, size ) )
goto Exit;
Exit:
return error;
}
/**************************************************************************
*
* @Function:
* tt_face_load_generic_header
*
* @Description:
* Loads the TrueType table `head' or `bhed'.
*
* @Input:
* face ::
* A handle to the target face object.
*
* stream ::
* The input stream.
*
* @Return:
* FreeType error code. 0 means success.
*/
static FT_Error
tt_face_load_generic_header( TT_Face face,
FT_Stream stream,
FT_ULong tag )
{
FT_Error error;
TT_Header* header;
static const FT_Frame_Field header_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE TT_Header
FT_FRAME_START( 54 ),
FT_FRAME_ULONG ( Table_Version ),
FT_FRAME_ULONG ( Font_Revision ),
FT_FRAME_LONG ( CheckSum_Adjust ),
FT_FRAME_LONG ( Magic_Number ),
FT_FRAME_USHORT( Flags ),
FT_FRAME_USHORT( Units_Per_EM ),
FT_FRAME_ULONG ( Created[0] ),
FT_FRAME_ULONG ( Created[1] ),
FT_FRAME_ULONG ( Modified[0] ),
FT_FRAME_ULONG ( Modified[1] ),
FT_FRAME_SHORT ( xMin ),
FT_FRAME_SHORT ( yMin ),
FT_FRAME_SHORT ( xMax ),
FT_FRAME_SHORT ( yMax ),
FT_FRAME_USHORT( Mac_Style ),
FT_FRAME_USHORT( Lowest_Rec_PPEM ),
FT_FRAME_SHORT ( Font_Direction ),
FT_FRAME_SHORT ( Index_To_Loc_Format ),
FT_FRAME_SHORT ( Glyph_Data_Format ),
FT_FRAME_END
};
error = face->goto_table( face, tag, stream, 0 );
if ( error )
goto Exit;
header = &face->header;
if ( FT_STREAM_READ_FIELDS( header_fields, header ) )
goto Exit;
FT_TRACE3(( "Units per EM: %4u\n", header->Units_Per_EM ));
FT_TRACE3(( "IndexToLoc: %4d\n", header->Index_To_Loc_Format ));
Exit:
return error;
}
FT_LOCAL_DEF( FT_Error )
tt_face_load_head( TT_Face face,
FT_Stream stream )
{
return tt_face_load_generic_header( face, stream, TTAG_head );
}
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
FT_LOCAL_DEF( FT_Error )
tt_face_load_bhed( TT_Face face,
FT_Stream stream )
{
return tt_face_load_generic_header( face, stream, TTAG_bhed );
}
#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
/**************************************************************************
*
* @Function:
* tt_face_load_maxp
*
* @Description:
* Loads the maximum profile into a face object.
*
* @Input:
* face ::
* A handle to the target face object.
*
* stream ::
* The input stream.
*
* @Return:
* FreeType error code. 0 means success.
*/
FT_LOCAL_DEF( FT_Error )
tt_face_load_maxp( TT_Face face,
FT_Stream stream )
{
FT_Error error;
TT_MaxProfile* maxProfile = &face->max_profile;
static const FT_Frame_Field maxp_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE TT_MaxProfile
FT_FRAME_START( 6 ),
FT_FRAME_LONG ( version ),
FT_FRAME_USHORT( numGlyphs ),
FT_FRAME_END
};
static const FT_Frame_Field maxp_fields_extra[] =
{
FT_FRAME_START( 26 ),
FT_FRAME_USHORT( maxPoints ),
FT_FRAME_USHORT( maxContours ),
FT_FRAME_USHORT( maxCompositePoints ),
FT_FRAME_USHORT( maxCompositeContours ),
FT_FRAME_USHORT( maxZones ),
FT_FRAME_USHORT( maxTwilightPoints ),
FT_FRAME_USHORT( maxStorage ),
FT_FRAME_USHORT( maxFunctionDefs ),
FT_FRAME_USHORT( maxInstructionDefs ),
FT_FRAME_USHORT( maxStackElements ),
FT_FRAME_USHORT( maxSizeOfInstructions ),
FT_FRAME_USHORT( maxComponentElements ),
FT_FRAME_USHORT( maxComponentDepth ),
FT_FRAME_END
};
error = face->goto_table( face, TTAG_maxp, stream, 0 );
if ( error )
goto Exit;
if ( FT_STREAM_READ_FIELDS( maxp_fields, maxProfile ) )
goto Exit;
maxProfile->maxPoints = 0;
maxProfile->maxContours = 0;
maxProfile->maxCompositePoints = 0;
maxProfile->maxCompositeContours = 0;
maxProfile->maxZones = 0;
maxProfile->maxTwilightPoints = 0;
maxProfile->maxStorage = 0;
maxProfile->maxFunctionDefs = 0;
maxProfile->maxInstructionDefs = 0;
maxProfile->maxStackElements = 0;
maxProfile->maxSizeOfInstructions = 0;
maxProfile->maxComponentElements = 0;
maxProfile->maxComponentDepth = 0;
if ( maxProfile->version >= 0x10000L )
{
if ( FT_STREAM_READ_FIELDS( maxp_fields_extra, maxProfile ) )
goto Exit;
/* XXX: an adjustment that is necessary to load certain */
/* broken fonts like `Keystrokes MT' :-( */
/* */
/* We allocate 64 function entries by default when */
/* the maxFunctionDefs value is smaller. */
if ( maxProfile->maxFunctionDefs < 64 )
maxProfile->maxFunctionDefs = 64;
/* we add 4 phantom points later */
if ( maxProfile->maxTwilightPoints > ( 0xFFFFU - 4 ) )
{
FT_TRACE0(( "tt_face_load_maxp:"
" too much twilight points in `maxp' table;\n"
" "
" some glyphs might be rendered incorrectly\n" ));
maxProfile->maxTwilightPoints = 0xFFFFU - 4;
}
}
FT_TRACE3(( "numGlyphs: %u\n", maxProfile->numGlyphs ));
Exit:
return error;
}
/**************************************************************************
*
* @Function:
* tt_face_load_name
*
* @Description:
* Loads the name records.
*
* @Input:
* face ::
* A handle to the target face object.
*
* stream ::
* The input stream.
*
* @Return:
* FreeType error code. 0 means success.
*/
FT_LOCAL_DEF( FT_Error )
tt_face_load_name( TT_Face face,
FT_Stream stream )
{
FT_Error error;
FT_Memory memory = stream->memory;
FT_ULong table_pos, table_len;
FT_ULong storage_start, storage_limit;
TT_NameTable table;
static const FT_Frame_Field name_table_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE TT_NameTableRec
FT_FRAME_START( 6 ),
FT_FRAME_USHORT( format ),
FT_FRAME_USHORT( numNameRecords ),
FT_FRAME_USHORT( storageOffset ),
FT_FRAME_END
};
static const FT_Frame_Field name_record_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE TT_NameRec
/* no FT_FRAME_START */
FT_FRAME_USHORT( platformID ),
FT_FRAME_USHORT( encodingID ),
FT_FRAME_USHORT( languageID ),
FT_FRAME_USHORT( nameID ),
FT_FRAME_USHORT( stringLength ),
FT_FRAME_USHORT( stringOffset ),
FT_FRAME_END
};
static const FT_Frame_Field langTag_record_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE TT_LangTagRec
/* no FT_FRAME_START */
FT_FRAME_USHORT( stringLength ),
FT_FRAME_USHORT( stringOffset ),
FT_FRAME_END
};
table = &face->name_table;
table->stream = stream;
error = face->goto_table( face, TTAG_name, stream, &table_len );
if ( error )
goto Exit;
table_pos = FT_STREAM_POS();
if ( FT_STREAM_READ_FIELDS( name_table_fields, table ) )
goto Exit;
/* Some popular Asian fonts have an invalid `storageOffset' value (it */
/* should be at least `6 + 12*numNameRecords'). However, the string */
/* offsets, computed as `storageOffset + entry->stringOffset', are */
/* valid pointers within the name table... */
/* */
/* We thus can't check `storageOffset' right now. */
/* */
storage_start = table_pos + 6 + 12 * table->numNameRecords;
storage_limit = table_pos + table_len;
if ( storage_start > storage_limit )
{
FT_ERROR(( "tt_face_load_name: invalid `name' table\n" ));
error = FT_THROW( Name_Table_Missing );
goto Exit;
}
/* `name' format 1 contains additional language tag records, */
/* which we load first */
if ( table->format == 1 )
{
if ( FT_STREAM_SEEK( storage_start ) ||
FT_READ_USHORT( table->numLangTagRecords ) )
goto Exit;
storage_start += 2 + 4 * table->numLangTagRecords;
/* allocate language tag records array */
if ( FT_NEW_ARRAY( table->langTags, table->numLangTagRecords ) ||
FT_FRAME_ENTER( table->numLangTagRecords * 4 ) )
goto Exit;
/* load language tags */
{
TT_LangTag entry = table->langTags;
TT_LangTag limit = FT_OFFSET( entry, table->numLangTagRecords );
for ( ; entry < limit; entry++ )
{
(void)FT_STREAM_READ_FIELDS( langTag_record_fields, entry );
/* check that the langTag string is within the table */
entry->stringOffset += table_pos + table->storageOffset;
if ( entry->stringOffset < storage_start ||
entry->stringOffset + entry->stringLength > storage_limit )
{
/* invalid entry; ignore it */
entry->stringLength = 0;
}
}
}
FT_FRAME_EXIT();
(void)FT_STREAM_SEEK( table_pos + 6 );
}
/* allocate name records array */
if ( FT_NEW_ARRAY( table->names, table->numNameRecords ) ||
FT_FRAME_ENTER( table->numNameRecords * 12 ) )
goto Exit;
/* load name records */
{
TT_Name entry = table->names;
FT_UInt count = table->numNameRecords;
for ( ; count > 0; count-- )
{
if ( FT_STREAM_READ_FIELDS( name_record_fields, entry ) )
continue;
/* check that the name is not empty */
if ( entry->stringLength == 0 )
continue;
/* check that the name string is within the table */
entry->stringOffset += table_pos + table->storageOffset;
if ( entry->stringOffset < storage_start ||
entry->stringOffset + entry->stringLength > storage_limit )
{
/* invalid entry; ignore it */
continue;
}
/* assure that we have a valid language tag ID, and */
/* that the corresponding langTag entry is valid, too */
if ( table->format == 1 && entry->languageID >= 0x8000U )
{
if ( entry->languageID - 0x8000U >= table->numLangTagRecords ||
!table->langTags[entry->languageID - 0x8000U].stringLength )
{
/* invalid entry; ignore it */
continue;
}
}
entry++;
}
/* reduce array size to the actually used elements */
count = (FT_UInt)( entry - table->names );
(void)FT_RENEW_ARRAY( table->names,
table->numNameRecords,
count );
table->numNameRecords = count;
}
FT_FRAME_EXIT();
/* everything went well, update face->num_names */
face->num_names = (FT_UShort)table->numNameRecords;
Exit:
return error;
}
/**************************************************************************
*
* @Function:
* tt_face_free_name
*
* @Description:
* Frees the name records.
*
* @Input:
* face ::
* A handle to the target face object.
*/
FT_LOCAL_DEF( void )
tt_face_free_name( TT_Face face )
{
FT_Memory memory = face->root.driver->root.memory;
TT_NameTable table = &face->name_table;
if ( table->names )
{
TT_Name entry = table->names;
TT_Name limit = entry + table->numNameRecords;
for ( ; entry < limit; entry++ )
FT_FREE( entry->string );
FT_FREE( table->names );
}
if ( table->langTags )
{
TT_LangTag entry = table->langTags;
TT_LangTag limit = entry + table->numLangTagRecords;
for ( ; entry < limit; entry++ )
FT_FREE( entry->string );
FT_FREE( table->langTags );
}
table->numNameRecords = 0;
table->numLangTagRecords = 0;
table->format = 0;
table->storageOffset = 0;
}
/**************************************************************************
*
* @Function:
* tt_face_load_cmap
*
* @Description:
* Loads the cmap directory in a face object. The cmaps themselves
* are loaded on demand in the `ttcmap.c' module.
*
* @Input:
* face ::
* A handle to the target face object.
*
* stream ::
* A handle to the input stream.
*
* @Return:
* FreeType error code. 0 means success.
*/
FT_LOCAL_DEF( FT_Error )
tt_face_load_cmap( TT_Face face,
FT_Stream stream )
{
FT_Error error;
error = face->goto_table( face, TTAG_cmap, stream, &face->cmap_size );
if ( error )
goto Exit;
if ( FT_FRAME_EXTRACT( face->cmap_size, face->cmap_table ) )
face->cmap_size = 0;
Exit:
return error;
}
/**************************************************************************
*
* @Function:
* tt_face_load_os2
*
* @Description:
* Loads the OS2 table.
*
* @Input:
* face ::
* A handle to the target face object.
*
* stream ::
* A handle to the input stream.
*
* @Return:
* FreeType error code. 0 means success.
*/
FT_LOCAL_DEF( FT_Error )
tt_face_load_os2( TT_Face face,
FT_Stream stream )
{
FT_Error error;
TT_OS2* os2;
static const FT_Frame_Field os2_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE TT_OS2
FT_FRAME_START( 78 ),
FT_FRAME_USHORT( version ),
FT_FRAME_SHORT ( xAvgCharWidth ),
FT_FRAME_USHORT( usWeightClass ),
FT_FRAME_USHORT( usWidthClass ),
FT_FRAME_SHORT ( fsType ),
FT_FRAME_SHORT ( ySubscriptXSize ),
FT_FRAME_SHORT ( ySubscriptYSize ),
FT_FRAME_SHORT ( ySubscriptXOffset ),
FT_FRAME_SHORT ( ySubscriptYOffset ),
FT_FRAME_SHORT ( ySuperscriptXSize ),
FT_FRAME_SHORT ( ySuperscriptYSize ),
FT_FRAME_SHORT ( ySuperscriptXOffset ),
FT_FRAME_SHORT ( ySuperscriptYOffset ),
FT_FRAME_SHORT ( yStrikeoutSize ),
FT_FRAME_SHORT ( yStrikeoutPosition ),
FT_FRAME_SHORT ( sFamilyClass ),
FT_FRAME_BYTE ( panose[0] ),
FT_FRAME_BYTE ( panose[1] ),
FT_FRAME_BYTE ( panose[2] ),
FT_FRAME_BYTE ( panose[3] ),
FT_FRAME_BYTE ( panose[4] ),
FT_FRAME_BYTE ( panose[5] ),
FT_FRAME_BYTE ( panose[6] ),
FT_FRAME_BYTE ( panose[7] ),
FT_FRAME_BYTE ( panose[8] ),
FT_FRAME_BYTE ( panose[9] ),
FT_FRAME_ULONG ( ulUnicodeRange1 ),
FT_FRAME_ULONG ( ulUnicodeRange2 ),
FT_FRAME_ULONG ( ulUnicodeRange3 ),
FT_FRAME_ULONG ( ulUnicodeRange4 ),
FT_FRAME_BYTE ( achVendID[0] ),
FT_FRAME_BYTE ( achVendID[1] ),
FT_FRAME_BYTE ( achVendID[2] ),
FT_FRAME_BYTE ( achVendID[3] ),
FT_FRAME_USHORT( fsSelection ),
FT_FRAME_USHORT( usFirstCharIndex ),
FT_FRAME_USHORT( usLastCharIndex ),
FT_FRAME_SHORT ( sTypoAscender ),
FT_FRAME_SHORT ( sTypoDescender ),
FT_FRAME_SHORT ( sTypoLineGap ),
FT_FRAME_USHORT( usWinAscent ),
FT_FRAME_USHORT( usWinDescent ),
FT_FRAME_END
};
/* `OS/2' version 1 and newer */
static const FT_Frame_Field os2_fields_extra1[] =
{
FT_FRAME_START( 8 ),
FT_FRAME_ULONG( ulCodePageRange1 ),
FT_FRAME_ULONG( ulCodePageRange2 ),
FT_FRAME_END
};
/* `OS/2' version 2 and newer */
static const FT_Frame_Field os2_fields_extra2[] =
{
FT_FRAME_START( 10 ),
FT_FRAME_SHORT ( sxHeight ),
FT_FRAME_SHORT ( sCapHeight ),
FT_FRAME_USHORT( usDefaultChar ),
FT_FRAME_USHORT( usBreakChar ),
FT_FRAME_USHORT( usMaxContext ),
FT_FRAME_END
};
/* `OS/2' version 5 and newer */
static const FT_Frame_Field os2_fields_extra5[] =
{
FT_FRAME_START( 4 ),
FT_FRAME_USHORT( usLowerOpticalPointSize ),
FT_FRAME_USHORT( usUpperOpticalPointSize ),
FT_FRAME_END
};
/* We now support old Mac fonts where the OS/2 table doesn't */
/* exist. Simply put, we set the `version' field to 0xFFFF */
/* and test this value each time we need to access the table. */
error = face->goto_table( face, TTAG_OS2, stream, 0 );
if ( error )
goto Exit;
os2 = &face->os2;
if ( FT_STREAM_READ_FIELDS( os2_fields, os2 ) )
goto Exit;
os2->ulCodePageRange1 = 0;
os2->ulCodePageRange2 = 0;
os2->sxHeight = 0;
os2->sCapHeight = 0;
os2->usDefaultChar = 0;
os2->usBreakChar = 0;
os2->usMaxContext = 0;
os2->usLowerOpticalPointSize = 0;
os2->usUpperOpticalPointSize = 0xFFFF;
if ( os2->version >= 0x0001 )
{
/* only version 1 tables */
if ( FT_STREAM_READ_FIELDS( os2_fields_extra1, os2 ) )
goto Exit;
if ( os2->version >= 0x0002 )
{
/* only version 2 tables */
if ( FT_STREAM_READ_FIELDS( os2_fields_extra2, os2 ) )
goto Exit;
if ( os2->version >= 0x0005 )
{
/* only version 5 tables */
if ( FT_STREAM_READ_FIELDS( os2_fields_extra5, os2 ) )
goto Exit;
}
}
}
FT_TRACE3(( "sTypoAscender: %4d\n", os2->sTypoAscender ));
FT_TRACE3(( "sTypoDescender: %4d\n", os2->sTypoDescender ));
FT_TRACE3(( "usWinAscent: %4u\n", os2->usWinAscent ));
FT_TRACE3(( "usWinDescent: %4u\n", os2->usWinDescent ));
FT_TRACE3(( "fsSelection: 0x%2x\n", os2->fsSelection ));
Exit:
return error;
}
/**************************************************************************
*
* @Function:
* tt_face_load_postscript
*
* @Description:
* Loads the Postscript table.
*
* @Input:
* face ::
* A handle to the target face object.
*
* stream ::
* A handle to the input stream.
*
* @Return:
* FreeType error code. 0 means success.
*/
FT_LOCAL_DEF( FT_Error )
tt_face_load_post( TT_Face face,
FT_Stream stream )
{
FT_Error error;
TT_Postscript* post = &face->postscript;
static const FT_Frame_Field post_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE TT_Postscript
FT_FRAME_START( 32 ),
FT_FRAME_LONG ( FormatType ),
FT_FRAME_LONG ( italicAngle ),
FT_FRAME_SHORT( underlinePosition ),
FT_FRAME_SHORT( underlineThickness ),
FT_FRAME_ULONG( isFixedPitch ),
FT_FRAME_ULONG( minMemType42 ),
FT_FRAME_ULONG( maxMemType42 ),
FT_FRAME_ULONG( minMemType1 ),
FT_FRAME_ULONG( maxMemType1 ),
FT_FRAME_END
};
error = face->goto_table( face, TTAG_post, stream, 0 );
if ( error )
return error;
if ( FT_STREAM_READ_FIELDS( post_fields, post ) )
return error;
/* we don't load the glyph names, we do that in another */
/* module (ttpost). */
FT_TRACE3(( "FormatType: 0x%lx\n", post->FormatType ));
FT_TRACE3(( "isFixedPitch: %s\n", post->isFixedPitch
? " yes" : " no" ));
return FT_Err_Ok;
}
/**************************************************************************
*
* @Function:
* tt_face_load_pclt
*
* @Description:
* Loads the PCL 5 Table.
*
* @Input:
* face ::
* A handle to the target face object.
*
* stream ::
* A handle to the input stream.
*
* @Return:
* FreeType error code. 0 means success.
*/
FT_LOCAL_DEF( FT_Error )
tt_face_load_pclt( TT_Face face,
FT_Stream stream )
{
static const FT_Frame_Field pclt_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE TT_PCLT
FT_FRAME_START( 54 ),
FT_FRAME_ULONG ( Version ),
FT_FRAME_ULONG ( FontNumber ),
FT_FRAME_USHORT( Pitch ),
FT_FRAME_USHORT( xHeight ),
FT_FRAME_USHORT( Style ),
FT_FRAME_USHORT( TypeFamily ),
FT_FRAME_USHORT( CapHeight ),
FT_FRAME_USHORT( SymbolSet ),
FT_FRAME_BYTES ( TypeFace, 16 ),
FT_FRAME_BYTES ( CharacterComplement, 8 ),
FT_FRAME_BYTES ( FileName, 6 ),
FT_FRAME_CHAR ( StrokeWeight ),
FT_FRAME_CHAR ( WidthType ),
FT_FRAME_BYTE ( SerifStyle ),
FT_FRAME_BYTE ( Reserved ),
FT_FRAME_END
};
FT_Error error;
TT_PCLT* pclt = &face->pclt;
/* optional table */
error = face->goto_table( face, TTAG_PCLT, stream, 0 );
if ( error )
goto Exit;
if ( FT_STREAM_READ_FIELDS( pclt_fields, pclt ) )
goto Exit;
Exit:
return error;
}
/**************************************************************************
*
* @Function:
* tt_face_load_gasp
*
* @Description:
* Loads the `gasp' table into a face object.
*
* @Input:
* face ::
* A handle to the target face object.
*
* stream ::
* The input stream.
*
* @Return:
* FreeType error code. 0 means success.
*/
FT_LOCAL_DEF( FT_Error )
tt_face_load_gasp( TT_Face face,
FT_Stream stream )
{
FT_Error error;
FT_Memory memory = stream->memory;
FT_UInt j,num_ranges;
TT_GaspRange gaspranges = NULL;
/* the gasp table is optional */
error = face->goto_table( face, TTAG_gasp, stream, 0 );
if ( error )
goto Exit;
if ( FT_FRAME_ENTER( 4L ) )
goto Exit;
face->gasp.version = FT_GET_USHORT();
face->gasp.numRanges = FT_GET_USHORT();
FT_FRAME_EXIT();
/* only support versions 0 and 1 of the table */
if ( face->gasp.version >= 2 )
{
face->gasp.numRanges = 0;
error = FT_THROW( Invalid_Table );
goto Exit;
}
num_ranges = face->gasp.numRanges;
FT_TRACE3(( "numRanges: %u\n", num_ranges ));
if ( FT_QNEW_ARRAY( face->gasp.gaspRanges, num_ranges ) ||
FT_FRAME_ENTER( num_ranges * 4L ) )
goto Exit;
gaspranges = face->gasp.gaspRanges;
for ( j = 0; j < num_ranges; j++ )
{
gaspranges[j].maxPPEM = FT_GET_USHORT();
gaspranges[j].gaspFlag = FT_GET_USHORT();
FT_TRACE3(( "gaspRange %d: rangeMaxPPEM %5d, rangeGaspBehavior 0x%x\n",
j,
gaspranges[j].maxPPEM,
gaspranges[j].gaspFlag ));
}
FT_FRAME_EXIT();
Exit:
return error;
}
/* END */