/*
* Copyright (C) 1998-2004 David Turner and Werner Lemberg
* Copyright (C) 2006 Behdad Esfahbod
* Copyright (C) 2007 Red Hat, Inc.
*
* This is part of HarfBuzz, an OpenType Layout engine library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Red Hat Author(s): Behdad Esfahbod
*/
#include "harfbuzz-impl.h"
#include "harfbuzz-gsub-private.h"
#include "harfbuzz-open-private.h"
#include "harfbuzz-gdef-private.h"
static HB_Error GSUB_Do_Glyph_Lookup( HB_GSUBHeader* gsub,
HB_UShort lookup_index,
HB_Buffer buffer,
HB_UShort context_length,
int nesting_level );
/**********************
* Auxiliary functions
**********************/
HB_Error HB_Load_GSUB_Table( HB_Font font,
HB_GSUBHeader** retptr,
hb_ot_layout_t *layout )
{
HB_Stream stream = font->stream;
HB_Error error;
HB_UInt cur_offset, new_offset, base_offset;
HB_GSUBHeader* gsub;
if ( !retptr || !layout )
return ERR(HB_Err_Invalid_Argument);
if ( GOTO_Table( TTAG_GSUB ) )
return error;
base_offset = FILE_Pos();
if ( ALLOC ( gsub, sizeof( *gsub ) ) )
return error;
/* skip version */
if ( FILE_Seek( base_offset + 4L ) ||
ACCESS_Frame( 2L ) )
goto Fail4;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = _HB_OPEN_Load_ScriptList( &gsub->ScriptList,
stream ) ) != HB_Err_Ok )
goto Fail4;
(void)FILE_Seek( cur_offset );
if ( ACCESS_Frame( 2L ) )
goto Fail3;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = _HB_OPEN_Load_FeatureList( &gsub->FeatureList,
stream ) ) != HB_Err_Ok )
goto Fail3;
(void)FILE_Seek( cur_offset );
if ( ACCESS_Frame( 2L ) )
goto Fail2;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = _HB_OPEN_Load_LookupList( &gsub->LookupList,
stream, HB_Type_GSUB ) ) != HB_Err_Ok )
goto Fail2;
gsub->layout = layout; /* can be NULL */
*retptr = gsub;
return HB_Err_Ok;
Fail2:
_HB_OPEN_Free_FeatureList( &gsub->FeatureList );
Fail3:
_HB_OPEN_Free_ScriptList( &gsub->ScriptList );
Fail4:
FREE ( gsub );
return error;
}
HB_Error HB_Done_GSUB_Table( HB_GSUBHeader* gsub )
{
_HB_OPEN_Free_LookupList( &gsub->LookupList, HB_Type_GSUB );
_HB_OPEN_Free_FeatureList( &gsub->FeatureList );
_HB_OPEN_Free_ScriptList( &gsub->ScriptList );
FREE( gsub );
return HB_Err_Ok;
}
/*****************************
* SubTable related functions
*****************************/
/* LookupType 1 */
/* SingleSubstFormat1 */
/* SingleSubstFormat2 */
static HB_Error Load_SingleSubst( HB_GSUB_SubTable* st,
HB_Stream stream )
{
HB_Error error;
HB_SingleSubst* ss = &st->single;
HB_UShort n, count;
HB_UInt cur_offset, new_offset, base_offset;
HB_UShort* s;
base_offset = FILE_Pos();
if ( ACCESS_Frame( 4L ) )
return error;
ss->SubstFormat = GET_UShort();
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = _HB_OPEN_Load_Coverage( &ss->Coverage, stream ) ) != HB_Err_Ok )
return error;
(void)FILE_Seek( cur_offset );
switch ( ss->SubstFormat )
{
case 1:
if ( ACCESS_Frame( 2L ) )
goto Fail2;
ss->ssf.ssf1.DeltaGlyphID = GET_UShort();
FORGET_Frame();
break;
case 2:
if ( ACCESS_Frame( 2L ) )
goto Fail2;
count = ss->ssf.ssf2.GlyphCount = GET_UShort();
FORGET_Frame();
ss->ssf.ssf2.Substitute = NULL;
if ( ALLOC_ARRAY( ss->ssf.ssf2.Substitute, count, HB_UShort ) )
goto Fail2;
s = ss->ssf.ssf2.Substitute;
if ( ACCESS_Frame( count * 2L ) )
goto Fail1;
for ( n = 0; n < count; n++ )
s[n] = GET_UShort();
FORGET_Frame();
break;
default:
return ERR(HB_Err_Invalid_SubTable_Format);
}
return HB_Err_Ok;
Fail1:
FREE( s );
Fail2:
_HB_OPEN_Free_Coverage( &ss->Coverage );
return error;
}
static void Free_SingleSubst( HB_GSUB_SubTable* st )
{
HB_SingleSubst* ss = &st->single;
switch ( ss->SubstFormat )
{
case 1:
break;
case 2:
FREE( ss->ssf.ssf2.Substitute );
break;
default:
break;
}
_HB_OPEN_Free_Coverage( &ss->Coverage );
}
static HB_Error Lookup_SingleSubst( HB_GSUBHeader* gsub,
HB_GSUB_SubTable* st,
HB_Buffer buffer,
HB_UShort flags,
HB_UShort context_length,
int nesting_level )
{
HB_UShort index, value, property;
HB_Error error;
HB_SingleSubst* ss = &st->single;
hb_ot_layout_t* layout = gsub->layout;
HB_UNUSED(nesting_level);
if ( context_length != 0xFFFF && context_length < 1 )
return HB_Err_Not_Covered;
if ( CHECK_Property( layout, IN_CURITEM(), flags, &property ) )
return error;
error = _HB_OPEN_Coverage_Index( &ss->Coverage, IN_CURGLYPH(), &index );
if ( error )
return error;
switch ( ss->SubstFormat )
{
case 1:
value = (IN_CURGLYPH() + ss->ssf.ssf1.DeltaGlyphID ) & 0xFFFF;
if ( REPLACE_Glyph( buffer, value ) )
return error;
break;
case 2:
if ( index >= ss->ssf.ssf2.GlyphCount )
return ERR(HB_Err_Invalid_SubTable);
value = ss->ssf.ssf2.Substitute[index];
if ( REPLACE_Glyph( buffer, value ) )
return error;
break;
default:
return ERR(HB_Err_Invalid_SubTable);
}
if ( _hb_ot_layout_has_new_glyph_classes (layout) )
{
/* we inherit the old glyph class to the substituted glyph */
hb_ot_layout_set_glyph_class (layout, value, property);
}
return HB_Err_Ok;
}
/* LookupType 2 */
/* Sequence */
static HB_Error Load_Sequence( HB_Sequence* s,
HB_Stream stream )
{
HB_Error error;
HB_UShort n, count;
HB_UShort* sub;
if ( ACCESS_Frame( 2L ) )
return error;
count = s->GlyphCount = GET_UShort();
FORGET_Frame();
s->Substitute = NULL;
if ( count )
{
if ( ALLOC_ARRAY( s->Substitute, count, HB_UShort ) )
return error;
sub = s->Substitute;
if ( ACCESS_Frame( count * 2L ) )
{
FREE( sub );
return error;
}
for ( n = 0; n < count; n++ )
sub[n] = GET_UShort();
FORGET_Frame();
}
return HB_Err_Ok;
}
static void Free_Sequence( HB_Sequence* s )
{
FREE( s->Substitute );
}
/* MultipleSubstFormat1 */
static HB_Error Load_MultipleSubst( HB_GSUB_SubTable* st,
HB_Stream stream )
{
HB_Error error;
HB_MultipleSubst* ms = &st->multiple;
HB_UShort n = 0, m, count;
HB_UInt cur_offset, new_offset, base_offset;
HB_Sequence* s;
base_offset = FILE_Pos();
if ( ACCESS_Frame( 4L ) )
return error;
ms->SubstFormat = GET_UShort(); /* should be 1 */
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = _HB_OPEN_Load_Coverage( &ms->Coverage, stream ) ) != HB_Err_Ok )
return error;
(void)FILE_Seek( cur_offset );
if ( ACCESS_Frame( 2L ) )
goto Fail2;
count = ms->SequenceCount = GET_UShort();
FORGET_Frame();
ms->Sequence = NULL;
if ( ALLOC_ARRAY( ms->Sequence, count, HB_Sequence ) )
goto Fail2;
s = ms->Sequence;
for ( n = 0; n < count; n++ )
{
if ( ACCESS_Frame( 2L ) )
goto Fail1;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = Load_Sequence( &s[n], stream ) ) != HB_Err_Ok )
goto Fail1;
(void)FILE_Seek( cur_offset );
}
return HB_Err_Ok;
Fail1:
for ( m = 0; m < n; m++ )
Free_Sequence( &s[m] );
FREE( s );
Fail2:
_HB_OPEN_Free_Coverage( &ms->Coverage );
return error;
}
static void Free_MultipleSubst( HB_GSUB_SubTable* st )
{
HB_UShort n, count;
HB_MultipleSubst* ms = &st->multiple;
HB_Sequence* s;
if ( ms->Sequence )
{
count = ms->SequenceCount;
s = ms->Sequence;
for ( n = 0; n < count; n++ )
Free_Sequence( &s[n] );
FREE( s );
}
_HB_OPEN_Free_Coverage( &ms->Coverage );
}
static HB_Error Lookup_MultipleSubst( HB_GSUBHeader* gsub,
HB_GSUB_SubTable* st,
HB_Buffer buffer,
HB_UShort flags,
HB_UShort context_length,
int nesting_level )
{
HB_Error error;
HB_UShort index, property, n, count;
HB_UShort*s;
HB_MultipleSubst* ms = &st->multiple;
hb_ot_layout_t* layout = gsub->layout;
HB_UNUSED(nesting_level);
if ( context_length != 0xFFFF && context_length < 1 )
return HB_Err_Not_Covered;
if ( CHECK_Property( layout, IN_CURITEM(), flags, &property ) )
return error;
error = _HB_OPEN_Coverage_Index( &ms->Coverage, IN_CURGLYPH(), &index );
if ( error )
return error;
if ( index >= ms->SequenceCount )
return ERR(HB_Err_Invalid_SubTable);
count = ms->Sequence[index].GlyphCount;
s = ms->Sequence[index].Substitute;
if ( ADD_String( buffer, 1, count, s, 0xFFFF, 0xFFFF ) )
return error;
if ( _hb_ot_layout_has_new_glyph_classes (layout) )
{
/* this is a guess only ... */
if ( property == HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE )
property = HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH;
for ( n = 0; n < count; n++ )
hb_ot_layout_set_glyph_class (layout, s[n], property);
}
return HB_Err_Ok;
}
/* LookupType 3 */
/* AlternateSet */
static HB_Error Load_AlternateSet( HB_AlternateSet* as,
HB_Stream stream )
{
HB_Error error;
HB_UShort n, count;
HB_UShort* a;
if ( ACCESS_Frame( 2L ) )
return error;
count = as->GlyphCount = GET_UShort();
FORGET_Frame();
as->Alternate = NULL;
if ( ALLOC_ARRAY( as->Alternate, count, HB_UShort ) )
return error;
a = as->Alternate;
if ( ACCESS_Frame( count * 2L ) )
{
FREE( a );
return error;
}
for ( n = 0; n < count; n++ )
a[n] = GET_UShort();
FORGET_Frame();
return HB_Err_Ok;
}
static void Free_AlternateSet( HB_AlternateSet* as )
{
FREE( as->Alternate );
}
/* AlternateSubstFormat1 */
static HB_Error Load_AlternateSubst( HB_GSUB_SubTable* st,
HB_Stream stream )
{
HB_Error error;
HB_AlternateSubst* as = &st->alternate;
HB_UShort n = 0, m, count;
HB_UInt cur_offset, new_offset, base_offset;
HB_AlternateSet* aset;
base_offset = FILE_Pos();
if ( ACCESS_Frame( 4L ) )
return error;
as->SubstFormat = GET_UShort(); /* should be 1 */
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = _HB_OPEN_Load_Coverage( &as->Coverage, stream ) ) != HB_Err_Ok )
return error;
(void)FILE_Seek( cur_offset );
if ( ACCESS_Frame( 2L ) )
goto Fail2;
count = as->AlternateSetCount = GET_UShort();
FORGET_Frame();
as->AlternateSet = NULL;
if ( ALLOC_ARRAY( as->AlternateSet, count, HB_AlternateSet ) )
goto Fail2;
aset = as->AlternateSet;
for ( n = 0; n < count; n++ )
{
if ( ACCESS_Frame( 2L ) )
goto Fail1;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = Load_AlternateSet( &aset[n], stream ) ) != HB_Err_Ok )
goto Fail1;
(void)FILE_Seek( cur_offset );
}
return HB_Err_Ok;
Fail1:
for ( m = 0; m < n; m++ )
Free_AlternateSet( &aset[m] );
FREE( aset );
Fail2:
_HB_OPEN_Free_Coverage( &as->Coverage );
return error;
}
static void Free_AlternateSubst( HB_GSUB_SubTable* st )
{
HB_UShort n, count;
HB_AlternateSubst* as = &st->alternate;
HB_AlternateSet* aset;
if ( as->AlternateSet )
{
count = as->AlternateSetCount;
aset = as->AlternateSet;
for ( n = 0; n < count; n++ )
Free_AlternateSet( &aset[n] );
FREE( aset );
}
_HB_OPEN_Free_Coverage( &as->Coverage );
}
static HB_Error Lookup_AlternateSubst( HB_GSUBHeader* gsub,
HB_GSUB_SubTable* st,
HB_Buffer buffer,
HB_UShort flags,
HB_UShort context_length,
int nesting_level )
{
HB_Error error;
HB_UShort index, value, alt_index, property;
HB_AlternateSubst* as = &st->alternate;
hb_ot_layout_t* layout = gsub->layout;
HB_AlternateSet aset;
HB_UNUSED(nesting_level);
if ( context_length != 0xFFFF && context_length < 1 )
return HB_Err_Not_Covered;
if ( CHECK_Property( layout, IN_CURITEM(), flags, &property ) )
return error;
error = _HB_OPEN_Coverage_Index( &as->Coverage, IN_CURGLYPH(), &index );
if ( error )
return error;
aset = as->AlternateSet[index];
/* we use a user-defined callback function to get the alternate index */
if ( gsub->altfunc )
alt_index = (gsub->altfunc)( buffer->out_pos, IN_CURGLYPH(),
aset.GlyphCount, aset.Alternate,
gsub->data );
else
alt_index = 0;
value = aset.Alternate[alt_index];
if ( REPLACE_Glyph( buffer, value ) )
return error;
if ( _hb_ot_layout_has_new_glyph_classes (layout) )
/* we inherit the old glyph class to the substituted glyph */
hb_ot_layout_set_glyph_class (layout, value, property);
return HB_Err_Ok;
}
/* LookupType 4 */
/* Ligature */
static HB_Error Load_Ligature( HB_Ligature* l,
HB_Stream stream )
{
HB_Error error;
HB_UShort n, count;
HB_UShort* c;
if ( ACCESS_Frame( 4L ) )
return error;
l->LigGlyph = GET_UShort();
l->ComponentCount = GET_UShort();
FORGET_Frame();
l->Component = NULL;
count = l->ComponentCount - 1; /* only ComponentCount - 1 elements */
if ( ALLOC_ARRAY( l->Component, count, HB_UShort ) )
return error;
c = l->Component;
if ( ACCESS_Frame( count * 2L ) )
{
FREE( c );
return error;
}
for ( n = 0; n < count; n++ )
c[n] = GET_UShort();
FORGET_Frame();
return HB_Err_Ok;
}
static void Free_Ligature( HB_Ligature* l )
{
FREE( l->Component );
}
/* LigatureSet */
static HB_Error Load_LigatureSet( HB_LigatureSet* ls,
HB_Stream stream )
{
HB_Error error;
HB_UShort n = 0, m, count;
HB_UInt cur_offset, new_offset, base_offset;
HB_Ligature* l;
base_offset = FILE_Pos();
if ( ACCESS_Frame( 2L ) )
return error;
count = ls->LigatureCount = GET_UShort();
FORGET_Frame();
ls->Ligature = NULL;
if ( ALLOC_ARRAY( ls->Ligature, count, HB_Ligature ) )
return error;
l = ls->Ligature;
for ( n = 0; n < count; n++ )
{
if ( ACCESS_Frame( 2L ) )
goto Fail;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = Load_Ligature( &l[n], stream ) ) != HB_Err_Ok )
goto Fail;
(void)FILE_Seek( cur_offset );
}
return HB_Err_Ok;
Fail:
for ( m = 0; m < n; m++ )
Free_Ligature( &l[m] );
FREE( l );
return error;
}
static void Free_LigatureSet( HB_LigatureSet* ls )
{
HB_UShort n, count;
HB_Ligature* l;
if ( ls->Ligature )
{
count = ls->LigatureCount;
l = ls->Ligature;
for ( n = 0; n < count; n++ )
Free_Ligature( &l[n] );
FREE( l );
}
}
/* LigatureSubstFormat1 */
static HB_Error Load_LigatureSubst( HB_GSUB_SubTable* st,
HB_Stream stream )
{
HB_Error error;
HB_LigatureSubst* ls = &st->ligature;
HB_UShort n = 0, m, count;
HB_UInt cur_offset, new_offset, base_offset;
HB_LigatureSet* lset;
base_offset = FILE_Pos();
if ( ACCESS_Frame( 4L ) )
return error;
ls->SubstFormat = GET_UShort(); /* should be 1 */
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = _HB_OPEN_Load_Coverage( &ls->Coverage, stream ) ) != HB_Err_Ok )
return error;
(void)FILE_Seek( cur_offset );
if ( ACCESS_Frame( 2L ) )
goto Fail2;
count = ls->LigatureSetCount = GET_UShort();
FORGET_Frame();
ls->LigatureSet = NULL;
if ( ALLOC_ARRAY( ls->LigatureSet, count, HB_LigatureSet ) )
goto Fail2;
lset = ls->LigatureSet;
for ( n = 0; n < count; n++ )
{
if ( ACCESS_Frame( 2L ) )
goto Fail1;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = Load_LigatureSet( &lset[n], stream ) ) != HB_Err_Ok )
goto Fail1;
(void)FILE_Seek( cur_offset );
}
return HB_Err_Ok;
Fail1:
for ( m = 0; m < n; m++ )
Free_LigatureSet( &lset[m] );
FREE( lset );
Fail2:
_HB_OPEN_Free_Coverage( &ls->Coverage );
return error;
}
static void Free_LigatureSubst( HB_GSUB_SubTable* st )
{
HB_UShort n, count;
HB_LigatureSubst* ls = &st->ligature;
HB_LigatureSet* lset;
if ( ls->LigatureSet )
{
count = ls->LigatureSetCount;
lset = ls->LigatureSet;
for ( n = 0; n < count; n++ )
Free_LigatureSet( &lset[n] );
FREE( lset );
}
_HB_OPEN_Free_Coverage( &ls->Coverage );
}
static HB_Error Lookup_LigatureSubst( HB_GSUBHeader* gsub,
HB_GSUB_SubTable* st,
HB_Buffer buffer,
HB_UShort flags,
HB_UShort context_length,
int nesting_level )
{
HB_UShort index, property;
HB_Error error;
HB_UShort numlig, i, j, is_mark, first_is_mark = FALSE;
HB_UShort* c;
HB_LigatureSubst* ls = &st->ligature;
hb_ot_layout_t* layout = gsub->layout;
HB_Ligature* lig;
HB_UNUSED(nesting_level);
if ( CHECK_Property( layout, IN_CURITEM(), flags, &property ) )
return error;
if ( property == HB_OT_LAYOUT_GLYPH_CLASS_MARK || property & HB_LOOKUP_FLAG_IGNORE_SPECIAL_MARKS )
first_is_mark = TRUE;
error = _HB_OPEN_Coverage_Index( &ls->Coverage, IN_CURGLYPH(), &index );
if ( error )
return error;
if ( index >= ls->LigatureSetCount )
return ERR(HB_Err_Invalid_SubTable);
lig = ls->LigatureSet[index].Ligature;
for ( numlig = ls->LigatureSet[index].LigatureCount;
numlig;
numlig--, lig++ )
{
if ( buffer->in_pos + lig->ComponentCount > buffer->in_length )
goto next_ligature; /* Not enough glyphs in input */
c = lig->Component;
is_mark = first_is_mark;
if ( context_length != 0xFFFF && context_length < lig->ComponentCount )
break;
for ( i = 1, j = buffer->in_pos + 1; i < lig->ComponentCount; i++, j++ )
{
while ( CHECK_Property( layout, IN_ITEM( j ), flags, &property ) )
{
if ( error && error != HB_Err_Not_Covered )
return error;
if ( j + lig->ComponentCount - i == (HB_Int)buffer->in_length )
goto next_ligature;
j++;
}
if ( !( property == HB_OT_LAYOUT_GLYPH_CLASS_MARK || property & HB_LOOKUP_FLAG_IGNORE_SPECIAL_MARKS ) )
is_mark = FALSE;
if ( IN_GLYPH( j ) != c[i - 1] )
goto next_ligature;
}
if ( _hb_ot_layout_has_new_glyph_classes (layout) )
/* this is just a guess ... */
hb_ot_layout_set_glyph_class (layout, lig->LigGlyph, is_mark ? HB_OT_LAYOUT_GLYPH_CLASS_MARK : HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE);
if ( j == buffer->in_pos + i ) /* No input glyphs skipped */
{
/* We don't use a new ligature ID if there are no skipped
glyphs and the ligature already has an ID. */
if ( IN_LIGID( buffer->in_pos ) )
{
if ( ADD_String( buffer, i, 1, &lig->LigGlyph,
0xFFFF, 0xFFFF ) )
return error;
}
else
{
HB_UShort ligID = _hb_buffer_allocate_ligid( buffer );
if ( ADD_String( buffer, i, 1, &lig->LigGlyph,
0xFFFF, ligID ) )
return error;
}
}
else
{
HB_UShort ligID = _hb_buffer_allocate_ligid( buffer );
if ( ADD_Glyph( buffer, lig->LigGlyph, 0xFFFF, ligID ) )
return error;
/* Now we must do a second loop to copy the skipped glyphs to
`out' and assign component values to it. We start with the
glyph after the first component. Glyphs between component
i and i+1 belong to component i. Together with the ligID
value it is later possible to check whether a specific
component value really belongs to a given ligature. */
for ( i = 0; i < lig->ComponentCount - 1; i++ )
{
while ( CHECK_Property( layout, IN_CURITEM(),
flags, &property ) )
if ( ADD_Glyph( buffer, IN_CURGLYPH(), i, ligID ) )
return error;
(buffer->in_pos)++;
}
}
return HB_Err_Ok;
next_ligature:
;
}
return HB_Err_Not_Covered;
}
/* Do the actual substitution for a context substitution (either format
5 or 6). This is only called after we've determined that the input
matches the subrule. */
static HB_Error Do_ContextSubst( HB_GSUBHeader* gsub,
HB_UShort GlyphCount,
HB_UShort SubstCount,
HB_SubstLookupRecord* subst,
HB_Buffer buffer,
int nesting_level )
{
HB_Error error;
HB_UInt i, old_pos;
i = 0;
while ( i < GlyphCount )
{
if ( SubstCount && i == subst->SequenceIndex )
{
old_pos = buffer->in_pos;
/* Do a substitution */
error = GSUB_Do_Glyph_Lookup( gsub, subst->LookupListIndex, buffer,
GlyphCount, nesting_level );
subst++;
SubstCount--;
i += buffer->in_pos - old_pos;
if ( error == HB_Err_Not_Covered )
{
if ( COPY_Glyph( buffer ) )
return error;
i++;
}
else if ( error )
return error;
}
else
{
/* No substitution for this index */
if ( COPY_Glyph( buffer ) )
return error;
i++;
}
}
return HB_Err_Ok;
}
/* LookupType 5 */
/* SubRule */
static HB_Error Load_SubRule( HB_SubRule* sr,
HB_Stream stream )
{
HB_Error error;
HB_UShort n, count;
HB_UShort* i;
HB_SubstLookupRecord* slr;
if ( ACCESS_Frame( 4L ) )
return error;
sr->GlyphCount = GET_UShort();
sr->SubstCount = GET_UShort();
FORGET_Frame();
sr->Input = NULL;
count = sr->GlyphCount - 1; /* only GlyphCount - 1 elements */
if ( ALLOC_ARRAY( sr->Input, count, HB_UShort ) )
return error;
i = sr->Input;
if ( ACCESS_Frame( count * 2L ) )
goto Fail2;
for ( n = 0; n < count; n++ )
i[n] = GET_UShort();
FORGET_Frame();
sr->SubstLookupRecord = NULL;
count = sr->SubstCount;
if ( ALLOC_ARRAY( sr->SubstLookupRecord, count, HB_SubstLookupRecord ) )
goto Fail2;
slr = sr->SubstLookupRecord;
if ( ACCESS_Frame( count * 4L ) )
goto Fail1;
for ( n = 0; n < count; n++ )
{
slr[n].SequenceIndex = GET_UShort();
slr[n].LookupListIndex = GET_UShort();
}
FORGET_Frame();
return HB_Err_Ok;
Fail1:
FREE( slr );
Fail2:
FREE( i );
return error;
}
static void Free_SubRule( HB_SubRule* sr )
{
FREE( sr->SubstLookupRecord );
FREE( sr->Input );
}
/* SubRuleSet */
static HB_Error Load_SubRuleSet( HB_SubRuleSet* srs,
HB_Stream stream )
{
HB_Error error;
HB_UShort n = 0, m, count;
HB_UInt cur_offset, new_offset, base_offset;
HB_SubRule* sr;
base_offset = FILE_Pos();
if ( ACCESS_Frame( 2L ) )
return error;
count = srs->SubRuleCount = GET_UShort();
FORGET_Frame();
srs->SubRule = NULL;
if ( ALLOC_ARRAY( srs->SubRule, count, HB_SubRule ) )
return error;
sr = srs->SubRule;
for ( n = 0; n < count; n++ )
{
if ( ACCESS_Frame( 2L ) )
goto Fail;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = Load_SubRule( &sr[n], stream ) ) != HB_Err_Ok )
goto Fail;
(void)FILE_Seek( cur_offset );
}
return HB_Err_Ok;
Fail:
for ( m = 0; m < n; m++ )
Free_SubRule( &sr[m] );
FREE( sr );
return error;
}
static void Free_SubRuleSet( HB_SubRuleSet* srs )
{
HB_UShort n, count;
HB_SubRule* sr;
if ( srs->SubRule )
{
count = srs->SubRuleCount;
sr = srs->SubRule;
for ( n = 0; n < count; n++ )
Free_SubRule( &sr[n] );
FREE( sr );
}
}
/* ContextSubstFormat1 */
static HB_Error Load_ContextSubst1( HB_ContextSubstFormat1* csf1,
HB_Stream stream )
{
HB_Error error;
HB_UShort n = 0, m, count;
HB_UInt cur_offset, new_offset, base_offset;
HB_SubRuleSet* srs;
base_offset = FILE_Pos() - 2L;
if ( ACCESS_Frame( 2L ) )
return error;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = _HB_OPEN_Load_Coverage( &csf1->Coverage, stream ) ) != HB_Err_Ok )
return error;
(void)FILE_Seek( cur_offset );
if ( ACCESS_Frame( 2L ) )
goto Fail2;
count = csf1->SubRuleSetCount = GET_UShort();
FORGET_Frame();
csf1->SubRuleSet = NULL;
if ( ALLOC_ARRAY( csf1->SubRuleSet, count, HB_SubRuleSet ) )
goto Fail2;
srs = csf1->SubRuleSet;
for ( n = 0; n < count; n++ )
{
if ( ACCESS_Frame( 2L ) )
goto Fail1;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = Load_SubRuleSet( &srs[n], stream ) ) != HB_Err_Ok )
goto Fail1;
(void)FILE_Seek( cur_offset );
}
return HB_Err_Ok;
Fail1:
for ( m = 0; m < n; m++ )
Free_SubRuleSet( &srs[m] );
FREE( srs );
Fail2:
_HB_OPEN_Free_Coverage( &csf1->Coverage );
return error;
}
static void Free_ContextSubst1( HB_ContextSubstFormat1* csf1 )
{
HB_UShort n, count;
HB_SubRuleSet* srs;
if ( csf1->SubRuleSet )
{
count = csf1->SubRuleSetCount;
srs = csf1->SubRuleSet;
for ( n = 0; n < count; n++ )
Free_SubRuleSet( &srs[n] );
FREE( srs );
}
_HB_OPEN_Free_Coverage( &csf1->Coverage );
}
/* SubClassRule */
static HB_Error Load_SubClassRule( HB_ContextSubstFormat2* csf2,
HB_SubClassRule* scr,
HB_Stream stream )
{
HB_Error error;
HB_UShort n, count;
HB_UShort* c;
HB_SubstLookupRecord* slr;
if ( ACCESS_Frame( 4L ) )
return error;
scr->GlyphCount = GET_UShort();
scr->SubstCount = GET_UShort();
if ( scr->GlyphCount > csf2->MaxContextLength )
csf2->MaxContextLength = scr->GlyphCount;
FORGET_Frame();
scr->Class = NULL;
count = scr->GlyphCount - 1; /* only GlyphCount - 1 elements */
if ( ALLOC_ARRAY( scr->Class, count, HB_UShort ) )
return error;
c = scr->Class;
if ( ACCESS_Frame( count * 2L ) )
goto Fail2;
for ( n = 0; n < count; n++ )
c[n] = GET_UShort();
FORGET_Frame();
scr->SubstLookupRecord = NULL;
count = scr->SubstCount;
if ( ALLOC_ARRAY( scr->SubstLookupRecord, count, HB_SubstLookupRecord ) )
goto Fail2;
slr = scr->SubstLookupRecord;
if ( ACCESS_Frame( count * 4L ) )
goto Fail1;
for ( n = 0; n < count; n++ )
{
slr[n].SequenceIndex = GET_UShort();
slr[n].LookupListIndex = GET_UShort();
}
FORGET_Frame();
return HB_Err_Ok;
Fail1:
FREE( slr );
Fail2:
FREE( c );
return error;
}
static void Free_SubClassRule( HB_SubClassRule* scr )
{
FREE( scr->SubstLookupRecord );
FREE( scr->Class );
}
/* SubClassSet */
static HB_Error Load_SubClassSet( HB_ContextSubstFormat2* csf2,
HB_SubClassSet* scs,
HB_Stream stream )
{
HB_Error error;
HB_UShort n = 0, m, count;
HB_UInt cur_offset, new_offset, base_offset;
HB_SubClassRule* scr;
base_offset = FILE_Pos();
if ( ACCESS_Frame( 2L ) )
return error;
count = scs->SubClassRuleCount = GET_UShort();
FORGET_Frame();
scs->SubClassRule = NULL;
if ( ALLOC_ARRAY( scs->SubClassRule, count, HB_SubClassRule ) )
return error;
scr = scs->SubClassRule;
for ( n = 0; n < count; n++ )
{
if ( ACCESS_Frame( 2L ) )
goto Fail;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = Load_SubClassRule( csf2, &scr[n],
stream ) ) != HB_Err_Ok )
goto Fail;
(void)FILE_Seek( cur_offset );
}
return HB_Err_Ok;
Fail:
for ( m = 0; m < n; m++ )
Free_SubClassRule( &scr[m] );
FREE( scr );
return error;
}
static void Free_SubClassSet( HB_SubClassSet* scs )
{
HB_UShort n, count;
HB_SubClassRule* scr;
if ( scs->SubClassRule )
{
count = scs->SubClassRuleCount;
scr = scs->SubClassRule;
for ( n = 0; n < count; n++ )
Free_SubClassRule( &scr[n] );
FREE( scr );
}
}
/* ContextSubstFormat2 */
static HB_Error Load_ContextSubst2( HB_ContextSubstFormat2* csf2,
HB_Stream stream )
{
HB_Error error;
HB_UShort n = 0, m, count;
HB_UInt cur_offset, new_offset, base_offset;
HB_SubClassSet* scs;
base_offset = FILE_Pos() - 2;
if ( ACCESS_Frame( 2L ) )
return error;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = _HB_OPEN_Load_Coverage( &csf2->Coverage, stream ) ) != HB_Err_Ok )
return error;
(void)FILE_Seek( cur_offset );
if ( ACCESS_Frame( 4L ) )
goto Fail3;
new_offset = GET_UShort() + base_offset;
/* `SubClassSetCount' is the upper limit for class values, thus we
read it now to make an additional safety check. */
count = csf2->SubClassSetCount = GET_UShort();
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = _HB_OPEN_Load_ClassDefinition( &csf2->ClassDef, count,
stream ) ) != HB_Err_Ok )
goto Fail3;
(void)FILE_Seek( cur_offset );
csf2->SubClassSet = NULL;
csf2->MaxContextLength = 0;
if ( ALLOC_ARRAY( csf2->SubClassSet, count, HB_SubClassSet ) )
goto Fail2;
scs = csf2->SubClassSet;
for ( n = 0; n < count; n++ )
{
if ( ACCESS_Frame( 2L ) )
goto Fail1;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
if ( new_offset != base_offset ) /* not a NULL offset */
{
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = Load_SubClassSet( csf2, &scs[n],
stream ) ) != HB_Err_Ok )
goto Fail1;
(void)FILE_Seek( cur_offset );
}
else
{
/* we create a SubClassSet table with no entries */
csf2->SubClassSet[n].SubClassRuleCount = 0;
csf2->SubClassSet[n].SubClassRule = NULL;
}
}
return HB_Err_Ok;
Fail1:
for ( m = 0; m < n; m++ )
Free_SubClassSet( &scs[m] );
FREE( scs );
Fail2:
_HB_OPEN_Free_ClassDefinition( &csf2->ClassDef );
Fail3:
_HB_OPEN_Free_Coverage( &csf2->Coverage );
return error;
}
static void Free_ContextSubst2( HB_ContextSubstFormat2* csf2 )
{
HB_UShort n, count;
HB_SubClassSet* scs;
if ( csf2->SubClassSet )
{
count = csf2->SubClassSetCount;
scs = csf2->SubClassSet;
for ( n = 0; n < count; n++ )
Free_SubClassSet( &scs[n] );
FREE( scs );
}
_HB_OPEN_Free_ClassDefinition( &csf2->ClassDef );
_HB_OPEN_Free_Coverage( &csf2->Coverage );
}
/* ContextSubstFormat3 */
static HB_Error Load_ContextSubst3( HB_ContextSubstFormat3* csf3,
HB_Stream stream )
{
HB_Error error;
HB_UShort n = 0, m, count;
HB_UInt cur_offset, new_offset, base_offset;
HB_Coverage* c;
HB_SubstLookupRecord* slr;
base_offset = FILE_Pos() - 2L;
if ( ACCESS_Frame( 4L ) )
return error;
csf3->GlyphCount = GET_UShort();
csf3->SubstCount = GET_UShort();
FORGET_Frame();
csf3->Coverage = NULL;
count = csf3->GlyphCount;
if ( ALLOC_ARRAY( csf3->Coverage, count, HB_Coverage ) )
return error;
c = csf3->Coverage;
for ( n = 0; n < count; n++ )
{
if ( ACCESS_Frame( 2L ) )
goto Fail2;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = _HB_OPEN_Load_Coverage( &c[n], stream ) ) != HB_Err_Ok )
goto Fail2;
(void)FILE_Seek( cur_offset );
}
csf3->SubstLookupRecord = NULL;
count = csf3->SubstCount;
if ( ALLOC_ARRAY( csf3->SubstLookupRecord, count,
HB_SubstLookupRecord ) )
goto Fail2;
slr = csf3->SubstLookupRecord;
if ( ACCESS_Frame( count * 4L ) )
goto Fail1;
for ( n = 0; n < count; n++ )
{
slr[n].SequenceIndex = GET_UShort();
slr[n].LookupListIndex = GET_UShort();
}
FORGET_Frame();
return HB_Err_Ok;
Fail1:
FREE( slr );
Fail2:
for ( m = 0; m < n; m++ )
_HB_OPEN_Free_Coverage( &c[m] );
FREE( c );
return error;
}
static void Free_ContextSubst3( HB_ContextSubstFormat3* csf3 )
{
HB_UShort n, count;
HB_Coverage* c;
FREE( csf3->SubstLookupRecord );
if ( csf3->Coverage )
{
count = csf3->GlyphCount;
c = csf3->Coverage;
for ( n = 0; n < count; n++ )
_HB_OPEN_Free_Coverage( &c[n] );
FREE( c );
}
}
/* ContextSubst */
static HB_Error Load_ContextSubst( HB_GSUB_SubTable* st,
HB_Stream stream )
{
HB_Error error;
HB_ContextSubst* cs = &st->context;
if ( ACCESS_Frame( 2L ) )
return error;
cs->SubstFormat = GET_UShort();
FORGET_Frame();
switch ( cs->SubstFormat )
{
case 1: return Load_ContextSubst1( &cs->csf.csf1, stream );
case 2: return Load_ContextSubst2( &cs->csf.csf2, stream );
case 3: return Load_ContextSubst3( &cs->csf.csf3, stream );
default: return ERR(HB_Err_Invalid_SubTable_Format);
}
return HB_Err_Ok; /* never reached */
}
static void Free_ContextSubst( HB_GSUB_SubTable* st )
{
HB_ContextSubst* cs = &st->context;
switch ( cs->SubstFormat )
{
case 1: Free_ContextSubst1( &cs->csf.csf1 ); break;
case 2: Free_ContextSubst2( &cs->csf.csf2 ); break;
case 3: Free_ContextSubst3( &cs->csf.csf3 ); break;
default: break;
}
}
static HB_Error Lookup_ContextSubst1( HB_GSUBHeader* gsub,
HB_ContextSubstFormat1* csf1,
HB_Buffer buffer,
HB_UShort flags,
HB_UShort context_length,
int nesting_level )
{
HB_UShort index, property;
HB_UShort i, j, k, numsr;
HB_Error error;
HB_SubRule* sr;
hb_ot_layout_t* layout;
layout = gsub->layout;
if ( CHECK_Property( layout, IN_CURITEM(), flags, &property ) )
return error;
error = _HB_OPEN_Coverage_Index( &csf1->Coverage, IN_CURGLYPH(), &index );
if ( error )
return error;
sr = csf1->SubRuleSet[index].SubRule;
numsr = csf1->SubRuleSet[index].SubRuleCount;
for ( k = 0; k < numsr; k++ )
{
if ( context_length != 0xFFFF && context_length < sr[k].GlyphCount )
goto next_subrule;
if ( buffer->in_pos + sr[k].GlyphCount > buffer->in_length )
goto next_subrule; /* context is too long */
for ( i = 1, j = buffer->in_pos + 1; i < sr[k].GlyphCount; i++, j++ )
{
while ( CHECK_Property( layout, IN_ITEM( j ), flags, &property ) )
{
if ( error && error != HB_Err_Not_Covered )
return error;
if ( j + sr[k].GlyphCount - i == (HB_Int)buffer->in_length )
goto next_subrule;
j++;
}
if ( IN_GLYPH( j ) != sr[k].Input[i - 1] )
goto next_subrule;
}
return Do_ContextSubst( gsub, sr[k].GlyphCount,
sr[k].SubstCount, sr[k].SubstLookupRecord,
buffer,
nesting_level );
next_subrule:
;
}
return HB_Err_Not_Covered;
}
static HB_Error Lookup_ContextSubst2( HB_GSUBHeader* gsub,
HB_ContextSubstFormat2* csf2,
HB_Buffer buffer,
HB_UShort flags,
HB_UShort context_length,
int nesting_level )
{
HB_UShort index, property;
HB_Error error;
HB_UShort i, j, k, known_classes;
HB_UShort* classes;
HB_UShort* cl;
HB_SubClassSet* scs;
HB_SubClassRule* sr;
hb_ot_layout_t* layout;
layout = gsub->layout;
if ( CHECK_Property( layout, IN_CURITEM(), flags, &property ) )
return error;
/* Note: The coverage table in format 2 doesn't give an index into
anything. It just lets us know whether or not we need to
do any lookup at all. */
error = _HB_OPEN_Coverage_Index( &csf2->Coverage, IN_CURGLYPH(), &index );
if ( error )
return error;
if (csf2->MaxContextLength < 1)
return HB_Err_Not_Covered;
if ( ALLOC_ARRAY( classes, csf2->MaxContextLength, HB_UShort ) )
return error;
error = _HB_OPEN_Get_Class( &csf2->ClassDef, IN_CURGLYPH(),
&classes[0], NULL );
if ( error && error != HB_Err_Not_Covered )
goto End;
known_classes = 0;
scs = &csf2->SubClassSet[classes[0]];
if ( !scs )
{
error = ERR(HB_Err_Invalid_SubTable);
goto End;
}
for ( k = 0; k < scs->SubClassRuleCount; k++ )
{
sr = &scs->SubClassRule[k];
if ( context_length != 0xFFFF && context_length < sr->GlyphCount )
goto next_subclassrule;
if ( buffer->in_pos + sr->GlyphCount > buffer->in_length )
goto next_subclassrule; /* context is too long */
cl = sr->Class;
/* Start at 1 because [0] is implied */
for ( i = 1, j = buffer->in_pos + 1; i < sr->GlyphCount; i++, j++ )
{
while ( CHECK_Property( layout, IN_ITEM( j ), flags, &property ) )
{
if ( error && error != HB_Err_Not_Covered )
goto End;
if ( j + sr->GlyphCount - i < (HB_Int)buffer->in_length )
goto next_subclassrule;
j++;
}
if ( i > known_classes )
{
/* Keeps us from having to do this for each rule */
error = _HB_OPEN_Get_Class( &csf2->ClassDef, IN_GLYPH( j ), &classes[i], NULL );
if ( error && error != HB_Err_Not_Covered )
goto End;
known_classes = i;
}
if ( cl[i - 1] != classes[i] )
goto next_subclassrule;
}
error = Do_ContextSubst( gsub, sr->GlyphCount,
sr->SubstCount, sr->SubstLookupRecord,
buffer,
nesting_level );
goto End;
next_subclassrule:
;
}
error = HB_Err_Not_Covered;
End:
FREE( classes );
return error;
}
static HB_Error Lookup_ContextSubst3( HB_GSUBHeader* gsub,
HB_ContextSubstFormat3* csf3,
HB_Buffer buffer,
HB_UShort flags,
HB_UShort context_length,
int nesting_level )
{
HB_Error error;
HB_UShort index, i, j, property;
HB_Coverage* c;
hb_ot_layout_t* layout;
layout = gsub->layout;
if ( CHECK_Property( layout, IN_CURITEM(), flags, &property ) )
return error;
if ( context_length != 0xFFFF && context_length < csf3->GlyphCount )
return HB_Err_Not_Covered;
if ( buffer->in_pos + csf3->GlyphCount > buffer->in_length )
return HB_Err_Not_Covered; /* context is too long */
c = csf3->Coverage;
for ( i = 1, j = buffer->in_pos + 1; i < csf3->GlyphCount; i++, j++ )
{
while ( CHECK_Property( layout, IN_ITEM( j ), flags, &property ) )
{
if ( error && error != HB_Err_Not_Covered )
return error;
if ( j + csf3->GlyphCount - i == (HB_Int)buffer->in_length )
return HB_Err_Not_Covered;
j++;
}
error = _HB_OPEN_Coverage_Index( &c[i], IN_GLYPH( j ), &index );
if ( error )
return error;
}
return Do_ContextSubst( gsub, csf3->GlyphCount,
csf3->SubstCount, csf3->SubstLookupRecord,
buffer,
nesting_level );
}
static HB_Error Lookup_ContextSubst( HB_GSUBHeader* gsub,
HB_GSUB_SubTable* st,
HB_Buffer buffer,
HB_UShort flags,
HB_UShort context_length,
int nesting_level )
{
HB_ContextSubst* cs = &st->context;
switch ( cs->SubstFormat )
{
case 1: return Lookup_ContextSubst1( gsub, &cs->csf.csf1, buffer, flags, context_length, nesting_level );
case 2: return Lookup_ContextSubst2( gsub, &cs->csf.csf2, buffer, flags, context_length, nesting_level );
case 3: return Lookup_ContextSubst3( gsub, &cs->csf.csf3, buffer, flags, context_length, nesting_level );
default: return ERR(HB_Err_Invalid_SubTable_Format);
}
return HB_Err_Ok; /* never reached */
}
/* LookupType 6 */
/* ChainSubRule */
static HB_Error Load_ChainSubRule( HB_ChainSubRule* csr,
HB_Stream stream )
{
HB_Error error;
HB_UShort n, count;
HB_UShort* b;
HB_UShort* i;
HB_UShort* l;
HB_SubstLookupRecord* slr;
if ( ACCESS_Frame( 2L ) )
return error;
csr->BacktrackGlyphCount = GET_UShort();
FORGET_Frame();
csr->Backtrack = NULL;
count = csr->BacktrackGlyphCount;
if ( ALLOC_ARRAY( csr->Backtrack, count, HB_UShort ) )
return error;
b = csr->Backtrack;
if ( ACCESS_Frame( count * 2L ) )
goto Fail4;
for ( n = 0; n < count; n++ )
b[n] = GET_UShort();
FORGET_Frame();
if ( ACCESS_Frame( 2L ) )
goto Fail4;
csr->InputGlyphCount = GET_UShort();
FORGET_Frame();
csr->Input = NULL;
count = csr->InputGlyphCount - 1; /* only InputGlyphCount - 1 elements */
if ( ALLOC_ARRAY( csr->Input, count, HB_UShort ) )
goto Fail4;
i = csr->Input;
if ( ACCESS_Frame( count * 2L ) )
goto Fail3;
for ( n = 0; n < count; n++ )
i[n] = GET_UShort();
FORGET_Frame();
if ( ACCESS_Frame( 2L ) )
goto Fail3;
csr->LookaheadGlyphCount = GET_UShort();
FORGET_Frame();
csr->Lookahead = NULL;
count = csr->LookaheadGlyphCount;
if ( ALLOC_ARRAY( csr->Lookahead, count, HB_UShort ) )
goto Fail3;
l = csr->Lookahead;
if ( ACCESS_Frame( count * 2L ) )
goto Fail2;
for ( n = 0; n < count; n++ )
l[n] = GET_UShort();
FORGET_Frame();
if ( ACCESS_Frame( 2L ) )
goto Fail2;
csr->SubstCount = GET_UShort();
FORGET_Frame();
csr->SubstLookupRecord = NULL;
count = csr->SubstCount;
if ( ALLOC_ARRAY( csr->SubstLookupRecord, count, HB_SubstLookupRecord ) )
goto Fail2;
slr = csr->SubstLookupRecord;
if ( ACCESS_Frame( count * 4L ) )
goto Fail1;
for ( n = 0; n < count; n++ )
{
slr[n].SequenceIndex = GET_UShort();
slr[n].LookupListIndex = GET_UShort();
}
FORGET_Frame();
return HB_Err_Ok;
Fail1:
FREE( slr );
Fail2:
FREE( l );
Fail3:
FREE( i );
Fail4:
FREE( b );
return error;
}
static void Free_ChainSubRule( HB_ChainSubRule* csr )
{
FREE( csr->SubstLookupRecord );
FREE( csr->Lookahead );
FREE( csr->Input );
FREE( csr->Backtrack );
}
/* ChainSubRuleSet */
static HB_Error Load_ChainSubRuleSet( HB_ChainSubRuleSet* csrs,
HB_Stream stream )
{
HB_Error error;
HB_UShort n = 0, m, count;
HB_UInt cur_offset, new_offset, base_offset;
HB_ChainSubRule* csr;
base_offset = FILE_Pos();
if ( ACCESS_Frame( 2L ) )
return error;
count = csrs->ChainSubRuleCount = GET_UShort();
FORGET_Frame();
csrs->ChainSubRule = NULL;
if ( ALLOC_ARRAY( csrs->ChainSubRule, count, HB_ChainSubRule ) )
return error;
csr = csrs->ChainSubRule;
for ( n = 0; n < count; n++ )
{
if ( ACCESS_Frame( 2L ) )
goto Fail;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = Load_ChainSubRule( &csr[n], stream ) ) != HB_Err_Ok )
goto Fail;
(void)FILE_Seek( cur_offset );
}
return HB_Err_Ok;
Fail:
for ( m = 0; m < n; m++ )
Free_ChainSubRule( &csr[m] );
FREE( csr );
return error;
}
static void Free_ChainSubRuleSet( HB_ChainSubRuleSet* csrs )
{
HB_UShort n, count;
HB_ChainSubRule* csr;
if ( csrs->ChainSubRule )
{
count = csrs->ChainSubRuleCount;
csr = csrs->ChainSubRule;
for ( n = 0; n < count; n++ )
Free_ChainSubRule( &csr[n] );
FREE( csr );
}
}
/* ChainContextSubstFormat1 */
static HB_Error Load_ChainContextSubst1(
HB_ChainContextSubstFormat1* ccsf1,
HB_Stream stream )
{
HB_Error error;
HB_UShort n = 0, m, count;
HB_UInt cur_offset, new_offset, base_offset;
HB_ChainSubRuleSet* csrs;
base_offset = FILE_Pos() - 2L;
if ( ACCESS_Frame( 2L ) )
return error;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = _HB_OPEN_Load_Coverage( &ccsf1->Coverage, stream ) ) != HB_Err_Ok )
return error;
(void)FILE_Seek( cur_offset );
if ( ACCESS_Frame( 2L ) )
goto Fail2;
count = ccsf1->ChainSubRuleSetCount = GET_UShort();
FORGET_Frame();
ccsf1->ChainSubRuleSet = NULL;
if ( ALLOC_ARRAY( ccsf1->ChainSubRuleSet, count, HB_ChainSubRuleSet ) )
goto Fail2;
csrs = ccsf1->ChainSubRuleSet;
for ( n = 0; n < count; n++ )
{
if ( ACCESS_Frame( 2L ) )
goto Fail1;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = Load_ChainSubRuleSet( &csrs[n], stream ) ) != HB_Err_Ok )
goto Fail1;
(void)FILE_Seek( cur_offset );
}
return HB_Err_Ok;
Fail1:
for ( m = 0; m < n; m++ )
Free_ChainSubRuleSet( &csrs[m] );
FREE( csrs );
Fail2:
_HB_OPEN_Free_Coverage( &ccsf1->Coverage );
return error;
}
static void Free_ChainContextSubst1( HB_ChainContextSubstFormat1* ccsf1 )
{
HB_UShort n, count;
HB_ChainSubRuleSet* csrs;
if ( ccsf1->ChainSubRuleSet )
{
count = ccsf1->ChainSubRuleSetCount;
csrs = ccsf1->ChainSubRuleSet;
for ( n = 0; n < count; n++ )
Free_ChainSubRuleSet( &csrs[n] );
FREE( csrs );
}
_HB_OPEN_Free_Coverage( &ccsf1->Coverage );
}
/* ChainSubClassRule */
static HB_Error Load_ChainSubClassRule(
HB_ChainContextSubstFormat2* ccsf2,
HB_ChainSubClassRule* cscr,
HB_Stream stream )
{
HB_Error error;
HB_UShort n, count;
HB_UShort* b;
HB_UShort* i;
HB_UShort* l;
HB_SubstLookupRecord* slr;
if ( ACCESS_Frame( 2L ) )
return error;
cscr->BacktrackGlyphCount = GET_UShort();
FORGET_Frame();
if ( cscr->BacktrackGlyphCount > ccsf2->MaxBacktrackLength )
ccsf2->MaxBacktrackLength = cscr->BacktrackGlyphCount;
cscr->Backtrack = NULL;
count = cscr->BacktrackGlyphCount;
if ( ALLOC_ARRAY( cscr->Backtrack, count, HB_UShort ) )
return error;
b = cscr->Backtrack;
if ( ACCESS_Frame( count * 2L ) )
goto Fail4;
for ( n = 0; n < count; n++ )
b[n] = GET_UShort();
FORGET_Frame();
if ( ACCESS_Frame( 2L ) )
goto Fail4;
cscr->InputGlyphCount = GET_UShort();
FORGET_Frame();
if ( cscr->InputGlyphCount > ccsf2->MaxInputLength )
ccsf2->MaxInputLength = cscr->InputGlyphCount;
cscr->Input = NULL;
count = cscr->InputGlyphCount - 1; /* only InputGlyphCount - 1 elements */
if ( ALLOC_ARRAY( cscr->Input, count, HB_UShort ) )
goto Fail4;
i = cscr->Input;
if ( ACCESS_Frame( count * 2L ) )
goto Fail3;
for ( n = 0; n < count; n++ )
i[n] = GET_UShort();
FORGET_Frame();
if ( ACCESS_Frame( 2L ) )
goto Fail3;
cscr->LookaheadGlyphCount = GET_UShort();
FORGET_Frame();
if ( cscr->LookaheadGlyphCount > ccsf2->MaxLookaheadLength )
ccsf2->MaxLookaheadLength = cscr->LookaheadGlyphCount;
cscr->Lookahead = NULL;
count = cscr->LookaheadGlyphCount;
if ( ALLOC_ARRAY( cscr->Lookahead, count, HB_UShort ) )
goto Fail3;
l = cscr->Lookahead;
if ( ACCESS_Frame( count * 2L ) )
goto Fail2;
for ( n = 0; n < count; n++ )
l[n] = GET_UShort();
FORGET_Frame();
if ( ACCESS_Frame( 2L ) )
goto Fail2;
cscr->SubstCount = GET_UShort();
FORGET_Frame();
cscr->SubstLookupRecord = NULL;
count = cscr->SubstCount;
if ( ALLOC_ARRAY( cscr->SubstLookupRecord, count,
HB_SubstLookupRecord ) )
goto Fail2;
slr = cscr->SubstLookupRecord;
if ( ACCESS_Frame( count * 4L ) )
goto Fail1;
for ( n = 0; n < count; n++ )
{
slr[n].SequenceIndex = GET_UShort();
slr[n].LookupListIndex = GET_UShort();
}
FORGET_Frame();
return HB_Err_Ok;
Fail1:
FREE( slr );
Fail2:
FREE( l );
Fail3:
FREE( i );
Fail4:
FREE( b );
return error;
}
static void Free_ChainSubClassRule( HB_ChainSubClassRule* cscr )
{
FREE( cscr->SubstLookupRecord );
FREE( cscr->Lookahead );
FREE( cscr->Input );
FREE( cscr->Backtrack );
}
/* SubClassSet */
static HB_Error Load_ChainSubClassSet(
HB_ChainContextSubstFormat2* ccsf2,
HB_ChainSubClassSet* cscs,
HB_Stream stream )
{
HB_Error error;
HB_UShort n = 0, m, count;
HB_UInt cur_offset, new_offset, base_offset;
HB_ChainSubClassRule* cscr;
base_offset = FILE_Pos();
if ( ACCESS_Frame( 2L ) )
return error;
count = cscs->ChainSubClassRuleCount = GET_UShort();
FORGET_Frame();
cscs->ChainSubClassRule = NULL;
if ( ALLOC_ARRAY( cscs->ChainSubClassRule, count,
HB_ChainSubClassRule ) )
return error;
cscr = cscs->ChainSubClassRule;
for ( n = 0; n < count; n++ )
{
if ( ACCESS_Frame( 2L ) )
goto Fail;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = Load_ChainSubClassRule( ccsf2, &cscr[n],
stream ) ) != HB_Err_Ok )
goto Fail;
(void)FILE_Seek( cur_offset );
}
return HB_Err_Ok;
Fail:
for ( m = 0; m < n; m++ )
Free_ChainSubClassRule( &cscr[m] );
FREE( cscr );
return error;
}
static void Free_ChainSubClassSet( HB_ChainSubClassSet* cscs )
{
HB_UShort n, count;
HB_ChainSubClassRule* cscr;
if ( cscs->ChainSubClassRule )
{
count = cscs->ChainSubClassRuleCount;
cscr = cscs->ChainSubClassRule;
for ( n = 0; n < count; n++ )
Free_ChainSubClassRule( &cscr[n] );
FREE( cscr );
}
}
/* ChainContextSubstFormat2 */
static HB_Error Load_ChainContextSubst2(
HB_ChainContextSubstFormat2* ccsf2,
HB_Stream stream )
{
HB_Error error;
HB_UShort n = 0, m, count;
HB_UInt cur_offset, new_offset, base_offset;
HB_UInt backtrack_offset, input_offset, lookahead_offset;
HB_ChainSubClassSet* cscs;
base_offset = FILE_Pos() - 2;
if ( ACCESS_Frame( 2L ) )
return error;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = _HB_OPEN_Load_Coverage( &ccsf2->Coverage, stream ) ) != HB_Err_Ok )
return error;
(void)FILE_Seek( cur_offset );
if ( ACCESS_Frame( 8L ) )
goto Fail5;
backtrack_offset = GET_UShort();
input_offset = GET_UShort();
lookahead_offset = GET_UShort();
/* `ChainSubClassSetCount' is the upper limit for input class values,
thus we read it now to make an additional safety check. No limit
is known or needed for the other two class definitions */
count = ccsf2->ChainSubClassSetCount = GET_UShort();
FORGET_Frame();
if ( ( error = _HB_OPEN_Load_EmptyOrClassDefinition( &ccsf2->BacktrackClassDef, 65535,
backtrack_offset, base_offset,
stream ) ) != HB_Err_Ok )
goto Fail5;
if ( ( error = _HB_OPEN_Load_EmptyOrClassDefinition( &ccsf2->InputClassDef, count,
input_offset, base_offset,
stream ) ) != HB_Err_Ok )
goto Fail4;
if ( ( error = _HB_OPEN_Load_EmptyOrClassDefinition( &ccsf2->LookaheadClassDef, 65535,
lookahead_offset, base_offset,
stream ) ) != HB_Err_Ok )
goto Fail3;
ccsf2->ChainSubClassSet = NULL;
ccsf2->MaxBacktrackLength = 0;
ccsf2->MaxInputLength = 0;
ccsf2->MaxLookaheadLength = 0;
if ( ALLOC_ARRAY( ccsf2->ChainSubClassSet, count, HB_ChainSubClassSet ) )
goto Fail2;
cscs = ccsf2->ChainSubClassSet;
for ( n = 0; n < count; n++ )
{
if ( ACCESS_Frame( 2L ) )
goto Fail1;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
if ( new_offset != base_offset ) /* not a NULL offset */
{
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = Load_ChainSubClassSet( ccsf2, &cscs[n],
stream ) ) != HB_Err_Ok )
goto Fail1;
(void)FILE_Seek( cur_offset );
}
else
{
/* we create a ChainSubClassSet table with no entries */
ccsf2->ChainSubClassSet[n].ChainSubClassRuleCount = 0;
ccsf2->ChainSubClassSet[n].ChainSubClassRule = NULL;
}
}
return HB_Err_Ok;
Fail1:
for ( m = 0; m < n; m++ )
Free_ChainSubClassSet( &cscs[m] );
FREE( cscs );
Fail2:
_HB_OPEN_Free_ClassDefinition( &ccsf2->LookaheadClassDef );
Fail3:
_HB_OPEN_Free_ClassDefinition( &ccsf2->InputClassDef );
Fail4:
_HB_OPEN_Free_ClassDefinition( &ccsf2->BacktrackClassDef );
Fail5:
_HB_OPEN_Free_Coverage( &ccsf2->Coverage );
return error;
}
static void Free_ChainContextSubst2( HB_ChainContextSubstFormat2* ccsf2 )
{
HB_UShort n, count;
HB_ChainSubClassSet* cscs;
if ( ccsf2->ChainSubClassSet )
{
count = ccsf2->ChainSubClassSetCount;
cscs = ccsf2->ChainSubClassSet;
for ( n = 0; n < count; n++ )
Free_ChainSubClassSet( &cscs[n] );
FREE( cscs );
}
_HB_OPEN_Free_ClassDefinition( &ccsf2->LookaheadClassDef );
_HB_OPEN_Free_ClassDefinition( &ccsf2->InputClassDef );
_HB_OPEN_Free_ClassDefinition( &ccsf2->BacktrackClassDef );
_HB_OPEN_Free_Coverage( &ccsf2->Coverage );
}
/* ChainContextSubstFormat3 */
static HB_Error Load_ChainContextSubst3(
HB_ChainContextSubstFormat3* ccsf3,
HB_Stream stream )
{
HB_Error error;
HB_UShort n, nb = 0, ni =0, nl = 0, m, count;
HB_UShort backtrack_count, input_count, lookahead_count;
HB_UInt cur_offset, new_offset, base_offset;
HB_Coverage* b;
HB_Coverage* i;
HB_Coverage* l;
HB_SubstLookupRecord* slr;
base_offset = FILE_Pos() - 2L;
if ( ACCESS_Frame( 2L ) )
return error;
ccsf3->BacktrackGlyphCount = GET_UShort();
FORGET_Frame();
ccsf3->BacktrackCoverage = NULL;
backtrack_count = ccsf3->BacktrackGlyphCount;
if ( ALLOC_ARRAY( ccsf3->BacktrackCoverage, backtrack_count,
HB_Coverage ) )
return error;
b = ccsf3->BacktrackCoverage;
for ( nb = 0; nb < backtrack_count; nb++ )
{
if ( ACCESS_Frame( 2L ) )
goto Fail4;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = _HB_OPEN_Load_Coverage( &b[nb], stream ) ) != HB_Err_Ok )
goto Fail4;
(void)FILE_Seek( cur_offset );
}
if ( ACCESS_Frame( 2L ) )
goto Fail4;
ccsf3->InputGlyphCount = GET_UShort();
FORGET_Frame();
ccsf3->InputCoverage = NULL;
input_count = ccsf3->InputGlyphCount;
if ( ALLOC_ARRAY( ccsf3->InputCoverage, input_count, HB_Coverage ) )
goto Fail4;
i = ccsf3->InputCoverage;
for ( ni = 0; ni < input_count; ni++ )
{
if ( ACCESS_Frame( 2L ) )
goto Fail3;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = _HB_OPEN_Load_Coverage( &i[ni], stream ) ) != HB_Err_Ok )
goto Fail3;
(void)FILE_Seek( cur_offset );
}
if ( ACCESS_Frame( 2L ) )
goto Fail3;
ccsf3->LookaheadGlyphCount = GET_UShort();
FORGET_Frame();
ccsf3->LookaheadCoverage = NULL;
lookahead_count = ccsf3->LookaheadGlyphCount;
if ( ALLOC_ARRAY( ccsf3->LookaheadCoverage, lookahead_count,
HB_Coverage ) )
goto Fail3;
l = ccsf3->LookaheadCoverage;
for ( nl = 0; nl < lookahead_count; nl++ )
{
if ( ACCESS_Frame( 2L ) )
goto Fail2;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = _HB_OPEN_Load_Coverage( &l[nl], stream ) ) != HB_Err_Ok )
goto Fail2;
(void)FILE_Seek( cur_offset );
}
if ( ACCESS_Frame( 2L ) )
goto Fail2;
ccsf3->SubstCount = GET_UShort();
FORGET_Frame();
ccsf3->SubstLookupRecord = NULL;
count = ccsf3->SubstCount;
if ( ALLOC_ARRAY( ccsf3->SubstLookupRecord, count,
HB_SubstLookupRecord ) )
goto Fail2;
slr = ccsf3->SubstLookupRecord;
if ( ACCESS_Frame( count * 4L ) )
goto Fail1;
for ( n = 0; n < count; n++ )
{
slr[n].SequenceIndex = GET_UShort();
slr[n].LookupListIndex = GET_UShort();
}
FORGET_Frame();
return HB_Err_Ok;
Fail1:
FREE( slr );
Fail2:
for ( m = 0; m < nl; m++ )
_HB_OPEN_Free_Coverage( &l[m] );
FREE( l );
Fail3:
for ( m = 0; m < ni; m++ )
_HB_OPEN_Free_Coverage( &i[m] );
FREE( i );
Fail4:
for ( m = 0; m < nb; m++ )
_HB_OPEN_Free_Coverage( &b[m] );
FREE( b );
return error;
}
static void Free_ChainContextSubst3( HB_ChainContextSubstFormat3* ccsf3 )
{
HB_UShort n, count;
HB_Coverage* c;
FREE( ccsf3->SubstLookupRecord );
if ( ccsf3->LookaheadCoverage )
{
count = ccsf3->LookaheadGlyphCount;
c = ccsf3->LookaheadCoverage;
for ( n = 0; n < count; n++ )
_HB_OPEN_Free_Coverage( &c[n] );
FREE( c );
}
if ( ccsf3->InputCoverage )
{
count = ccsf3->InputGlyphCount;
c = ccsf3->InputCoverage;
for ( n = 0; n < count; n++ )
_HB_OPEN_Free_Coverage( &c[n] );
FREE( c );
}
if ( ccsf3->BacktrackCoverage )
{
count = ccsf3->BacktrackGlyphCount;
c = ccsf3->BacktrackCoverage;
for ( n = 0; n < count; n++ )
_HB_OPEN_Free_Coverage( &c[n] );
FREE( c );
}
}
/* ChainContextSubst */
static HB_Error Load_ChainContextSubst( HB_GSUB_SubTable* st,
HB_Stream stream )
{
HB_Error error;
HB_ChainContextSubst* ccs = &st->chain;
if ( ACCESS_Frame( 2L ) )
return error;
ccs->SubstFormat = GET_UShort();
FORGET_Frame();
switch ( ccs->SubstFormat ) {
case 1: return Load_ChainContextSubst1( &ccs->ccsf.ccsf1, stream );
case 2: return Load_ChainContextSubst2( &ccs->ccsf.ccsf2, stream );
case 3: return Load_ChainContextSubst3( &ccs->ccsf.ccsf3, stream );
default: return ERR(HB_Err_Invalid_SubTable_Format);
}
return HB_Err_Ok; /* never reached */
}
static void Free_ChainContextSubst( HB_GSUB_SubTable* st )
{
HB_ChainContextSubst* ccs = &st->chain;
switch ( ccs->SubstFormat ) {
case 1: Free_ChainContextSubst1( &ccs->ccsf.ccsf1 ); break;
case 2: Free_ChainContextSubst2( &ccs->ccsf.ccsf2 ); break;
case 3: Free_ChainContextSubst3( &ccs->ccsf.ccsf3 ); break;
default: break;
}
}
static HB_Error Lookup_ChainContextSubst1( HB_GSUBHeader* gsub,
HB_ChainContextSubstFormat1* ccsf1,
HB_Buffer buffer,
HB_UShort flags,
HB_UShort context_length,
int nesting_level )
{
HB_UShort index, property;
HB_UShort i, j, k, num_csr;
HB_UShort bgc, igc, lgc;
HB_Error error;
HB_ChainSubRule* csr;
HB_ChainSubRule curr_csr;
hb_ot_layout_t* layout;
layout = gsub->layout;
if ( CHECK_Property( layout, IN_CURITEM(), flags, &property ) )
return error;
error = _HB_OPEN_Coverage_Index( &ccsf1->Coverage, IN_CURGLYPH(), &index );
if ( error )
return error;
csr = ccsf1->ChainSubRuleSet[index].ChainSubRule;
num_csr = ccsf1->ChainSubRuleSet[index].ChainSubRuleCount;
for ( k = 0; k < num_csr; k++ )
{
curr_csr = csr[k];
bgc = curr_csr.BacktrackGlyphCount;
igc = curr_csr.InputGlyphCount;
lgc = curr_csr.LookaheadGlyphCount;
if ( context_length != 0xFFFF && context_length < igc )
goto next_chainsubrule;
/* check whether context is too long; it is a first guess only */
if ( bgc > buffer->out_pos || buffer->in_pos + igc + lgc > buffer->in_length )
goto next_chainsubrule;
if ( bgc )
{
/* since we don't know in advance the number of glyphs to inspect,
we search backwards for matches in the backtrack glyph array */
for ( i = 0, j = buffer->out_pos - 1; i < bgc; i++, j-- )
{
while ( CHECK_Property( layout, OUT_ITEM( j ), flags, &property ) )
{
if ( error && error != HB_Err_Not_Covered )
return error;
if ( j + 1 == bgc - i )
goto next_chainsubrule;
j--;
}
/* In OpenType 1.3, it is undefined whether the offsets of
backtrack glyphs is in logical order or not. Version 1.4
will clarify this:
Logical order - a b c d e f g h i j
i
Input offsets - 0 1
Backtrack offsets - 3 2 1 0
Lookahead offsets - 0 1 2 3 */
if ( OUT_GLYPH( j ) != curr_csr.Backtrack[i] )
goto next_chainsubrule;
}
}
/* Start at 1 because [0] is implied */
for ( i = 1, j = buffer->in_pos + 1; i < igc; i++, j++ )
{
while ( CHECK_Property( layout, IN_ITEM( j ), flags, &property ) )
{
if ( error && error != HB_Err_Not_Covered )
return error;
if ( j + igc - i + lgc == (HB_Int)buffer->in_length )
goto next_chainsubrule;
j++;
}
if ( IN_GLYPH( j ) != curr_csr.Input[i - 1] )
goto next_chainsubrule;
}
/* we are starting to check for lookahead glyphs right after the
last context glyph */
for ( i = 0; i < lgc; i++, j++ )
{
while ( CHECK_Property( layout, IN_ITEM( j ), flags, &property ) )
{
if ( error && error != HB_Err_Not_Covered )
return error;
if ( j + lgc - i == (HB_Int)buffer->in_length )
goto next_chainsubrule;
j++;
}
if ( IN_GLYPH( j ) != curr_csr.Lookahead[i] )
goto next_chainsubrule;
}
return Do_ContextSubst( gsub, igc,
curr_csr.SubstCount,
curr_csr.SubstLookupRecord,
buffer,
nesting_level );
next_chainsubrule:
;
}
return HB_Err_Not_Covered;
}
static HB_Error Lookup_ChainContextSubst2( HB_GSUBHeader* gsub,
HB_ChainContextSubstFormat2* ccsf2,
HB_Buffer buffer,
HB_UShort flags,
HB_UShort context_length,
int nesting_level )
{
HB_UShort index, property;
HB_Error error;
HB_UShort i, j, k;
HB_UShort bgc, igc, lgc;
HB_UShort known_backtrack_classes,
known_input_classes,
known_lookahead_classes;
HB_UShort* backtrack_classes;
HB_UShort* input_classes;
HB_UShort* lookahead_classes;
HB_UShort* bc;
HB_UShort* ic;
HB_UShort* lc;
HB_ChainSubClassSet* cscs;
HB_ChainSubClassRule ccsr;
hb_ot_layout_t* layout;
layout = gsub->layout;
if ( CHECK_Property( layout, IN_CURITEM(), flags, &property ) )
return error;
/* Note: The coverage table in format 2 doesn't give an index into
anything. It just lets us know whether or not we need to
do any lookup at all. */
error = _HB_OPEN_Coverage_Index( &ccsf2->Coverage, IN_CURGLYPH(), &index );
if ( error )
return error;
if ( ALLOC_ARRAY( backtrack_classes, ccsf2->MaxBacktrackLength, HB_UShort ) )
return error;
known_backtrack_classes = 0;
if (ccsf2->MaxInputLength < 1)
return HB_Err_Not_Covered;
if ( ALLOC_ARRAY( input_classes, ccsf2->MaxInputLength, HB_UShort ) )
goto End3;
known_input_classes = 1;
if ( ALLOC_ARRAY( lookahead_classes, ccsf2->MaxLookaheadLength, HB_UShort ) )
goto End2;
known_lookahead_classes = 0;
error = _HB_OPEN_Get_Class( &ccsf2->InputClassDef, IN_CURGLYPH(),
&input_classes[0], NULL );
if ( error && error != HB_Err_Not_Covered )
goto End1;
cscs = &ccsf2->ChainSubClassSet[input_classes[0]];
if ( !cscs )
{
error = ERR(HB_Err_Invalid_SubTable);
goto End1;
}
for ( k = 0; k < cscs->ChainSubClassRuleCount; k++ )
{
ccsr = cscs->ChainSubClassRule[k];
bgc = ccsr.BacktrackGlyphCount;
igc = ccsr.InputGlyphCount;
lgc = ccsr.LookaheadGlyphCount;
if ( context_length != 0xFFFF && context_length < igc )
goto next_chainsubclassrule;
/* check whether context is too long; it is a first guess only */
if ( bgc > buffer->out_pos || buffer->in_pos + igc + lgc > buffer->in_length )
goto next_chainsubclassrule;
if ( bgc )
{
/* Since we don't know in advance the number of glyphs to inspect,
we search backwards for matches in the backtrack glyph array.
Note that `known_backtrack_classes' starts at index 0. */
bc = ccsr.Backtrack;
for ( i = 0, j = buffer->out_pos - 1; i < bgc; i++, j-- )
{
while ( CHECK_Property( layout, OUT_ITEM( j ), flags, &property ) )
{
if ( error && error != HB_Err_Not_Covered )
goto End1;
if ( j + 1 == bgc - i )
goto next_chainsubclassrule;
j--;
}
if ( i >= known_backtrack_classes )
{
/* Keeps us from having to do this for each rule */
error = _HB_OPEN_Get_Class( &ccsf2->BacktrackClassDef, OUT_GLYPH( j ),
&backtrack_classes[i], NULL );
if ( error && error != HB_Err_Not_Covered )
goto End1;
known_backtrack_classes = i;
}
if ( bc[i] != backtrack_classes[i] )
goto next_chainsubclassrule;
}
}
ic = ccsr.Input;
/* Start at 1 because [0] is implied */
for ( i = 1, j = buffer->in_pos + 1; i < igc; i++, j++ )
{
while ( CHECK_Property( layout, IN_ITEM( j ), flags, &property ) )
{
if ( error && error != HB_Err_Not_Covered )
goto End1;
if ( j + igc - i + lgc == (HB_Int)buffer->in_length )
goto next_chainsubclassrule;
j++;
}
if ( i >= known_input_classes )
{
error = _HB_OPEN_Get_Class( &ccsf2->InputClassDef, IN_GLYPH( j ),
&input_classes[i], NULL );
if ( error && error != HB_Err_Not_Covered )
goto End1;
known_input_classes = i;
}
if ( ic[i - 1] != input_classes[i] )
goto next_chainsubclassrule;
}
/* we are starting to check for lookahead glyphs right after the
last context glyph */
lc = ccsr.Lookahead;
for ( i = 0; i < lgc; i++, j++ )
{
while ( CHECK_Property( layout, IN_ITEM( j ), flags, &property ) )
{
if ( error && error != HB_Err_Not_Covered )
goto End1;
if ( j + lgc - i == (HB_Int)buffer->in_length )
goto next_chainsubclassrule;
j++;
}
if ( i >= known_lookahead_classes )
{
error = _HB_OPEN_Get_Class( &ccsf2->LookaheadClassDef, IN_GLYPH( j ),
&lookahead_classes[i], NULL );
if ( error && error != HB_Err_Not_Covered )
goto End1;
known_lookahead_classes = i;
}
if ( lc[i] != lookahead_classes[i] )
goto next_chainsubclassrule;
}
error = Do_ContextSubst( gsub, igc,
ccsr.SubstCount,
ccsr.SubstLookupRecord,
buffer,
nesting_level );
goto End1;
next_chainsubclassrule:
;
}
error = HB_Err_Not_Covered;
End1:
FREE( lookahead_classes );
End2:
FREE( input_classes );
End3:
FREE( backtrack_classes );
return error;
}
static HB_Error Lookup_ChainContextSubst3( HB_GSUBHeader* gsub,
HB_ChainContextSubstFormat3* ccsf3,
HB_Buffer buffer,
HB_UShort flags,
HB_UShort context_length,
int nesting_level )
{
HB_UShort index, i, j, property;
HB_UShort bgc, igc, lgc;
HB_Error error;
HB_Coverage* bc;
HB_Coverage* ic;
HB_Coverage* lc;
hb_ot_layout_t* layout;
layout = gsub->layout;
if ( CHECK_Property( layout, IN_CURITEM(), flags, &property ) )
return error;
bgc = ccsf3->BacktrackGlyphCount;
igc = ccsf3->InputGlyphCount;
lgc = ccsf3->LookaheadGlyphCount;
if ( context_length != 0xFFFF && context_length < igc )
return HB_Err_Not_Covered;
/* check whether context is too long; it is a first guess only */
if ( bgc > buffer->out_pos || buffer->in_pos + igc + lgc > buffer->in_length )
return HB_Err_Not_Covered;
if ( bgc )
{
/* Since we don't know in advance the number of glyphs to inspect,
we search backwards for matches in the backtrack glyph array */
bc = ccsf3->BacktrackCoverage;
for ( i = 0, j = buffer->out_pos - 1; i < bgc; i++, j-- )
{
while ( CHECK_Property( layout, OUT_ITEM( j ), flags, &property ) )
{
if ( error && error != HB_Err_Not_Covered )
return error;
if ( j + 1 == bgc - i )
return HB_Err_Not_Covered;
j--;
}
error = _HB_OPEN_Coverage_Index( &bc[i], OUT_GLYPH( j ), &index );
if ( error )
return error;
}
}
ic = ccsf3->InputCoverage;
for ( i = 0, j = buffer->in_pos; i < igc; i++, j++ )
{
/* We already called CHECK_Property for IN_GLYPH( buffer->in_pos ) */
while ( j > buffer->in_pos && CHECK_Property( layout, IN_ITEM( j ), flags, &property ) )
{
if ( error && error != HB_Err_Not_Covered )
return error;
if ( j + igc - i + lgc == (HB_Int)buffer->in_length )
return HB_Err_Not_Covered;
j++;
}
error = _HB_OPEN_Coverage_Index( &ic[i], IN_GLYPH( j ), &index );
if ( error )
return error;
}
/* we are starting for lookahead glyphs right after the last context
glyph */
lc = ccsf3->LookaheadCoverage;
for ( i = 0; i < lgc; i++, j++ )
{
while ( CHECK_Property( layout, IN_ITEM( j ), flags, &property ) )
{
if ( error && error != HB_Err_Not_Covered )
return error;
if ( j + lgc - i == (HB_Int)buffer->in_length )
return HB_Err_Not_Covered;
j++;
}
error = _HB_OPEN_Coverage_Index( &lc[i], IN_GLYPH( j ), &index );
if ( error )
return error;
}
return Do_ContextSubst( gsub, igc,
ccsf3->SubstCount,
ccsf3->SubstLookupRecord,
buffer,
nesting_level );
}
static HB_Error Lookup_ChainContextSubst( HB_GSUBHeader* gsub,
HB_GSUB_SubTable* st,
HB_Buffer buffer,
HB_UShort flags,
HB_UShort context_length,
int nesting_level )
{
HB_ChainContextSubst* ccs = &st->chain;
switch ( ccs->SubstFormat ) {
case 1: return Lookup_ChainContextSubst1( gsub, &ccs->ccsf.ccsf1, buffer, flags, context_length, nesting_level );
case 2: return Lookup_ChainContextSubst2( gsub, &ccs->ccsf.ccsf2, buffer, flags, context_length, nesting_level );
case 3: return Lookup_ChainContextSubst3( gsub, &ccs->ccsf.ccsf3, buffer, flags, context_length, nesting_level );
default: return ERR(HB_Err_Invalid_SubTable_Format);
}
}
static HB_Error Load_ReverseChainContextSubst( HB_GSUB_SubTable* st,
HB_Stream stream )
{
HB_Error error;
HB_ReverseChainContextSubst* rccs = &st->reverse;
HB_UShort m, count;
HB_UShort nb = 0, nl = 0, n;
HB_UShort backtrack_count, lookahead_count;
HB_UInt cur_offset, new_offset, base_offset;
HB_Coverage* b;
HB_Coverage* l;
HB_UShort* sub;
base_offset = FILE_Pos();
if ( ACCESS_Frame( 2L ) )
return error;
rccs->SubstFormat = GET_UShort();
if ( rccs->SubstFormat != 1 )
return ERR(HB_Err_Invalid_SubTable_Format);
FORGET_Frame();
if ( ACCESS_Frame( 2L ) )
return error;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = _HB_OPEN_Load_Coverage( &rccs->Coverage, stream ) ) != HB_Err_Ok )
return error;
(void)FILE_Seek( cur_offset );
if ( ACCESS_Frame( 2L ) )
goto Fail4;
rccs->BacktrackGlyphCount = GET_UShort();
FORGET_Frame();
rccs->BacktrackCoverage = NULL;
backtrack_count = rccs->BacktrackGlyphCount;
if ( ALLOC_ARRAY( rccs->BacktrackCoverage, backtrack_count,
HB_Coverage ) )
goto Fail4;
b = rccs->BacktrackCoverage;
for ( nb = 0; nb < backtrack_count; nb++ )
{
if ( ACCESS_Frame( 2L ) )
goto Fail3;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = _HB_OPEN_Load_Coverage( &b[nb], stream ) ) != HB_Err_Ok )
goto Fail3;
(void)FILE_Seek( cur_offset );
}
if ( ACCESS_Frame( 2L ) )
goto Fail3;
rccs->LookaheadGlyphCount = GET_UShort();
FORGET_Frame();
rccs->LookaheadCoverage = NULL;
lookahead_count = rccs->LookaheadGlyphCount;
if ( ALLOC_ARRAY( rccs->LookaheadCoverage, lookahead_count,
HB_Coverage ) )
goto Fail3;
l = rccs->LookaheadCoverage;
for ( nl = 0; nl < lookahead_count; nl++ )
{
if ( ACCESS_Frame( 2L ) )
goto Fail2;
new_offset = GET_UShort() + base_offset;
FORGET_Frame();
cur_offset = FILE_Pos();
if ( FILE_Seek( new_offset ) ||
( error = _HB_OPEN_Load_Coverage( &l[nl], stream ) ) != HB_Err_Ok )
goto Fail2;
(void)FILE_Seek( cur_offset );
}
if ( ACCESS_Frame( 2L ) )
goto Fail2;
rccs->GlyphCount = GET_UShort();
FORGET_Frame();
rccs->Substitute = NULL;
count = rccs->GlyphCount;
if ( ALLOC_ARRAY( rccs->Substitute, count,
HB_UShort ) )
goto Fail2;
sub = rccs->Substitute;
if ( ACCESS_Frame( count * 2L ) )
goto Fail1;
for ( n = 0; n < count; n++ )
sub[n] = GET_UShort();
FORGET_Frame();
return HB_Err_Ok;
Fail1:
FREE( sub );
Fail2:
for ( m = 0; m < nl; m++ )
_HB_OPEN_Free_Coverage( &l[m] );
FREE( l );
Fail3:
for ( m = 0; m < nb; m++ )
_HB_OPEN_Free_Coverage( &b[m] );
FREE( b );
Fail4:
_HB_OPEN_Free_Coverage( &rccs->Coverage );
return error;
}
static void Free_ReverseChainContextSubst( HB_GSUB_SubTable* st )
{
HB_UShort n, count;
HB_ReverseChainContextSubst* rccs = &st->reverse;
HB_Coverage* c;
_HB_OPEN_Free_Coverage( &rccs->Coverage );
if ( rccs->LookaheadCoverage )
{
count = rccs->LookaheadGlyphCount;
c = rccs->LookaheadCoverage;
for ( n = 0; n < count; n++ )
_HB_OPEN_Free_Coverage( &c[n] );
FREE( c );
}
if ( rccs->BacktrackCoverage )
{
count = rccs->BacktrackGlyphCount;
c = rccs->BacktrackCoverage;
for ( n = 0; n < count; n++ )
_HB_OPEN_Free_Coverage( &c[n] );
FREE( c );
}
FREE ( rccs->Substitute );
}
static HB_Error Lookup_ReverseChainContextSubst( HB_GSUBHeader* gsub,
HB_GSUB_SubTable* st,
HB_Buffer buffer,
HB_UShort flags,
HB_UShort context_length,
int nesting_level )
{
HB_UShort index, input_index, i, j, property;
HB_UShort bgc, lgc;
HB_Error error;
HB_ReverseChainContextSubst* rccs = &st->reverse;
HB_Coverage* bc;
HB_Coverage* lc;
hb_ot_layout_t* layout;
if ( nesting_level != 1 || context_length != 0xFFFF )
return HB_Err_Not_Covered;
layout = gsub->layout;
if ( CHECK_Property( layout, IN_CURITEM(), flags, &property ) )
return error;
bgc = rccs->BacktrackGlyphCount;
lgc = rccs->LookaheadGlyphCount;
/* check whether context is too long; it is a first guess only */
if ( bgc > buffer->in_pos || buffer->in_pos + 1 + lgc > buffer->in_length )
return HB_Err_Not_Covered;
if ( bgc )
{
/* Since we don't know in advance the number of glyphs to inspect,
we search backwards for matches in the backtrack glyph array */
bc = rccs->BacktrackCoverage;
for ( i = 0, j = buffer->in_pos - 1; i < bgc; i++, j-- )
{
while ( CHECK_Property( layout, IN_ITEM( j ), flags, &property ) )
{
if ( error && error != HB_Err_Not_Covered )
return error;
if ( j + 1 == bgc - i )
return HB_Err_Not_Covered;
j--;
}
error = _HB_OPEN_Coverage_Index( &bc[i], IN_GLYPH( j ), &index );
if ( error )
return error;
}
}
j = buffer->in_pos;
error = _HB_OPEN_Coverage_Index( &rccs->Coverage, IN_GLYPH( j ), &input_index );
if ( error )
return error;
lc = rccs->LookaheadCoverage;
for ( i = 0, j = buffer->in_pos + 1; i < lgc; i++, j++ )
{
while ( CHECK_Property( layout, IN_ITEM( j ), flags, &property ) )
{
if ( error && error != HB_Err_Not_Covered )
return error;
if ( j + lgc - i == (HB_Int)buffer->in_length )
return HB_Err_Not_Covered;
j++;
}
error = _HB_OPEN_Coverage_Index( &lc[i], IN_GLYPH( j ), &index );
if ( error )
return error;
}
IN_CURGLYPH() = rccs->Substitute[input_index];
buffer->in_pos--; /* Reverse! */
return error;
}
/***********
* GSUB API
***********/
HB_Error HB_GSUB_Select_Script( HB_GSUBHeader* gsub,
HB_UInt script_tag,
HB_UShort* script_index )
{
HB_UShort n;
HB_ScriptList* sl;
HB_ScriptRecord* sr;
if ( !gsub || !script_index )
return ERR(HB_Err_Invalid_Argument);
sl = &gsub->ScriptList;
sr = sl->ScriptRecord;
for ( n = 0; n < sl->ScriptCount; n++ )
if ( script_tag == sr[n].ScriptTag )
{
*script_index = n;
return HB_Err_Ok;
}
return HB_Err_Not_Covered;
}
HB_Error HB_GSUB_Select_Language( HB_GSUBHeader* gsub,
HB_UInt language_tag,
HB_UShort script_index,
HB_UShort* language_index,
HB_UShort* req_feature_index )
{
HB_UShort n;
HB_ScriptList* sl;
HB_ScriptRecord* sr;
HB_ScriptTable* s;
HB_LangSysRecord* lsr;
if ( !gsub || !language_index || !req_feature_index )
return ERR(HB_Err_Invalid_Argument);
sl = &gsub->ScriptList;
sr = sl->ScriptRecord;
if ( script_index >= sl->ScriptCount )
return ERR(HB_Err_Invalid_Argument);
s = &sr[script_index].Script;
lsr = s->LangSysRecord;
for ( n = 0; n < s->LangSysCount; n++ )
if ( language_tag == lsr[n].LangSysTag )
{
*language_index = n;
*req_feature_index = lsr[n].LangSys.ReqFeatureIndex;
return HB_Err_Ok;
}
return HB_Err_Not_Covered;
}
/* selecting 0xFFFF for language_index asks for the values of the
default language (DefaultLangSys) */
HB_Error HB_GSUB_Select_Feature( HB_GSUBHeader* gsub,
HB_UInt feature_tag,
HB_UShort script_index,
HB_UShort language_index,
HB_UShort* feature_index )
{
HB_UShort n;
HB_ScriptList* sl;
HB_ScriptRecord* sr;
HB_ScriptTable* s;
HB_LangSysRecord* lsr;
HB_LangSys* ls;
HB_UShort* fi;
HB_FeatureList* fl;
HB_FeatureRecord* fr;
if ( !gsub || !feature_index )
return ERR(HB_Err_Invalid_Argument);
sl = &gsub->ScriptList;
sr = sl->ScriptRecord;
fl = &gsub->FeatureList;
fr = fl->FeatureRecord;
if ( script_index >= sl->ScriptCount )
return ERR(HB_Err_Invalid_Argument);
s = &sr[script_index].Script;
lsr = s->LangSysRecord;
if ( language_index == 0xFFFF )
ls = &s->DefaultLangSys;
else
{
if ( language_index >= s->LangSysCount )
return ERR(HB_Err_Invalid_Argument);
ls = &lsr[language_index].LangSys;
}
fi = ls->FeatureIndex;
for ( n = 0; n < ls->FeatureCount; n++ )
{
if ( fi[n] >= fl->FeatureCount )
return ERR(HB_Err_Invalid_SubTable_Format);
if ( feature_tag == fr[fi[n]].FeatureTag )
{
*feature_index = fi[n];
return HB_Err_Ok;
}
}
return HB_Err_Not_Covered;
}
/* The next three functions return a null-terminated list */
HB_Error HB_GSUB_Query_Scripts( HB_GSUBHeader* gsub,
HB_UInt** script_tag_list )
{
HB_UShort n;
HB_Error error;
HB_UInt* stl;
HB_ScriptList* sl;
HB_ScriptRecord* sr;
if ( !gsub || !script_tag_list )
return ERR(HB_Err_Invalid_Argument);
sl = &gsub->ScriptList;
sr = sl->ScriptRecord;
if ( ALLOC_ARRAY( stl, sl->ScriptCount + 1, HB_UInt ) )
return error;
for ( n = 0; n < sl->ScriptCount; n++ )
stl[n] = sr[n].ScriptTag;
stl[n] = 0;
*script_tag_list = stl;
return HB_Err_Ok;
}
HB_Error HB_GSUB_Query_Languages( HB_GSUBHeader* gsub,
HB_UShort script_index,
HB_UInt** language_tag_list )
{
HB_UShort n;
HB_Error error;
HB_UInt* ltl;
HB_ScriptList* sl;
HB_ScriptRecord* sr;
HB_ScriptTable* s;
HB_LangSysRecord* lsr;
if ( !gsub || !language_tag_list )
return ERR(HB_Err_Invalid_Argument);
sl = &gsub->ScriptList;
sr = sl->ScriptRecord;
if ( script_index >= sl->ScriptCount )
return ERR(HB_Err_Invalid_Argument);
s = &sr[script_index].Script;
lsr = s->LangSysRecord;
if ( ALLOC_ARRAY( ltl, s->LangSysCount + 1, HB_UInt ) )
return error;
for ( n = 0; n < s->LangSysCount; n++ )
ltl[n] = lsr[n].LangSysTag;
ltl[n] = 0;
*language_tag_list = ltl;
return HB_Err_Ok;
}
/* selecting 0xFFFF for language_index asks for the values of the
default language (DefaultLangSys) */
HB_Error HB_GSUB_Query_Features( HB_GSUBHeader* gsub,
HB_UShort script_index,
HB_UShort language_index,
HB_UInt** feature_tag_list )
{
HB_UShort n;
HB_Error error;
HB_UInt* ftl;
HB_ScriptList* sl;
HB_ScriptRecord* sr;
HB_ScriptTable* s;
HB_LangSysRecord* lsr;
HB_LangSys* ls;
HB_UShort* fi;
HB_FeatureList* fl;
HB_FeatureRecord* fr;
if ( !gsub || !feature_tag_list )
return ERR(HB_Err_Invalid_Argument);
sl = &gsub->ScriptList;
sr = sl->ScriptRecord;
fl = &gsub->FeatureList;
fr = fl->FeatureRecord;
if ( script_index >= sl->ScriptCount )
return ERR(HB_Err_Invalid_Argument);
s = &sr[script_index].Script;
lsr = s->LangSysRecord;
if ( language_index == 0xFFFF )
ls = &s->DefaultLangSys;
else
{
if ( language_index >= s->LangSysCount )
return ERR(HB_Err_Invalid_Argument);
ls = &lsr[language_index].LangSys;
}
fi = ls->FeatureIndex;
if ( ALLOC_ARRAY( ftl, ls->FeatureCount + 1, HB_UInt ) )
return error;
for ( n = 0; n < ls->FeatureCount; n++ )
{
if ( fi[n] >= fl->FeatureCount )
{
FREE( ftl );
return ERR(HB_Err_Invalid_SubTable_Format);
}
ftl[n] = fr[fi[n]].FeatureTag;
}
ftl[n] = 0;
*feature_tag_list = ftl;
return HB_Err_Ok;
}
/* Do an individual subtable lookup. Returns HB_Err_Ok if substitution
has been done, or HB_Err_Not_Covered if not. */
static HB_Error GSUB_Do_Glyph_Lookup( HB_GSUBHeader* gsub,
HB_UShort lookup_index,
HB_Buffer buffer,
HB_UShort context_length,
int nesting_level )
{
HB_Error error = HB_Err_Not_Covered;
HB_UShort i, flags, lookup_count;
HB_Lookup* lo;
int lookup_type;
nesting_level++;
if ( nesting_level > HB_MAX_NESTING_LEVEL )
return ERR(HB_Err_Not_Covered); /* ERR() call intended */
lookup_count = gsub->LookupList.LookupCount;
if (lookup_index >= lookup_count)
return error;
lo = &gsub->LookupList.Lookup[lookup_index];
flags = lo->LookupFlag;
lookup_type = lo->LookupType;
for ( i = 0; i < lo->SubTableCount; i++ )
{
HB_GSUB_SubTable *st = &lo->SubTable[i].st.gsub;
switch (lookup_type) {
case HB_GSUB_LOOKUP_SINGLE:
error = Lookup_SingleSubst ( gsub, st, buffer, flags, context_length, nesting_level ); break;
case HB_GSUB_LOOKUP_MULTIPLE:
error = Lookup_MultipleSubst ( gsub, st, buffer, flags, context_length, nesting_level ); break;
case HB_GSUB_LOOKUP_ALTERNATE:
error = Lookup_AlternateSubst ( gsub, st, buffer, flags, context_length, nesting_level ); break;
case HB_GSUB_LOOKUP_LIGATURE:
error = Lookup_LigatureSubst ( gsub, st, buffer, flags, context_length, nesting_level ); break;
case HB_GSUB_LOOKUP_CONTEXT:
error = Lookup_ContextSubst ( gsub, st, buffer, flags, context_length, nesting_level ); break;
case HB_GSUB_LOOKUP_CHAIN:
error = Lookup_ChainContextSubst ( gsub, st, buffer, flags, context_length, nesting_level ); break;
/*case HB_GSUB_LOOKUP_EXTENSION:
error = Lookup_ExtensionSubst ( gsub, st, buffer, flags, context_length, nesting_level ); break;*/
case HB_GSUB_LOOKUP_REVERSE_CHAIN:
error = Lookup_ReverseChainContextSubst ( gsub, st, buffer, flags, context_length, nesting_level ); break;
default:
error = HB_Err_Not_Covered;
};
/* Check whether we have a successful substitution or an error other
than HB_Err_Not_Covered */
if ( error != HB_Err_Not_Covered )
return error;
}
return HB_Err_Not_Covered;
}
HB_INTERNAL HB_Error
_HB_GSUB_Load_SubTable( HB_GSUB_SubTable* st,
HB_Stream stream,
HB_UShort lookup_type )
{
switch (lookup_type) {
case HB_GSUB_LOOKUP_SINGLE: return Load_SingleSubst ( st, stream );
case HB_GSUB_LOOKUP_MULTIPLE: return Load_MultipleSubst ( st, stream );
case HB_GSUB_LOOKUP_ALTERNATE: return Load_AlternateSubst ( st, stream );
case HB_GSUB_LOOKUP_LIGATURE: return Load_LigatureSubst ( st, stream );
case HB_GSUB_LOOKUP_CONTEXT: return Load_ContextSubst ( st, stream );
case HB_GSUB_LOOKUP_CHAIN: return Load_ChainContextSubst ( st, stream );
/*case HB_GSUB_LOOKUP_EXTENSION: return Load_ExtensionSubst ( st, stream );*/
case HB_GSUB_LOOKUP_REVERSE_CHAIN: return Load_ReverseChainContextSubst ( st, stream );
default: return ERR(HB_Err_Invalid_SubTable_Format);
};
}
HB_INTERNAL void
_HB_GSUB_Free_SubTable( HB_GSUB_SubTable* st,
HB_UShort lookup_type )
{
switch ( lookup_type ) {
case HB_GSUB_LOOKUP_SINGLE: Free_SingleSubst ( st ); return;
case HB_GSUB_LOOKUP_MULTIPLE: Free_MultipleSubst ( st ); return;
case HB_GSUB_LOOKUP_ALTERNATE: Free_AlternateSubst ( st ); return;
case HB_GSUB_LOOKUP_LIGATURE: Free_LigatureSubst ( st ); return;
case HB_GSUB_LOOKUP_CONTEXT: Free_ContextSubst ( st ); return;
case HB_GSUB_LOOKUP_CHAIN: Free_ChainContextSubst ( st ); return;
/*case HB_GSUB_LOOKUP_EXTENSION: Free_ExtensionSubst ( st ); return;*/
case HB_GSUB_LOOKUP_REVERSE_CHAIN: Free_ReverseChainContextSubst ( st ); return;
default: return;
};
}
/* apply one lookup to the input string object */
static HB_Error GSUB_Do_String_Lookup( HB_GSUBHeader* gsub,
HB_UShort lookup_index,
HB_Buffer buffer )
{
HB_Error error, retError = HB_Err_Not_Covered;
HB_UInt* properties = gsub->LookupList.Properties;
int lookup_type = gsub->LookupList.Lookup[lookup_index].LookupType;
const int nesting_level = 0;
/* 0xFFFF indicates that we don't have a context length yet */
const HB_UShort context_length = 0xFFFF;
switch (lookup_type) {
case HB_GSUB_LOOKUP_SINGLE:
case HB_GSUB_LOOKUP_MULTIPLE:
case HB_GSUB_LOOKUP_ALTERNATE:
case HB_GSUB_LOOKUP_LIGATURE:
case HB_GSUB_LOOKUP_CONTEXT:
case HB_GSUB_LOOKUP_CHAIN:
/* in/out forward substitution (implemented lazy) */
_hb_buffer_clear_output ( buffer );
buffer->in_pos = 0;
while ( buffer->in_pos < buffer->in_length )
{
if ( ~IN_PROPERTIES( buffer->in_pos ) & properties[lookup_index] )
{
error = GSUB_Do_Glyph_Lookup( gsub, lookup_index, buffer, context_length, nesting_level );
if ( error )
{
if ( error != HB_Err_Not_Covered )
return error;
}
else
retError = error;
}
else
error = HB_Err_Not_Covered;
if ( error == HB_Err_Not_Covered )
if ( COPY_Glyph ( buffer ) )
return error;
}
/* we shouldn't swap if error occurred.
*
* also don't swap if nothing changed (ie HB_Err_Not_Covered).
* shouldn't matter in that case though.
*/
if ( retError == HB_Err_Ok )
_hb_buffer_swap( buffer );
return retError;
case HB_GSUB_LOOKUP_REVERSE_CHAIN:
/* in-place backward substitution */
buffer->in_pos = buffer->in_length - 1;
do
{
if ( ~IN_PROPERTIES( buffer->in_pos ) & properties[lookup_index] )
{
error = GSUB_Do_Glyph_Lookup( gsub, lookup_index, buffer, context_length, nesting_level );
if ( error )
{
if ( error != HB_Err_Not_Covered )
return error;
}
else
retError = error;
}
else
error = HB_Err_Not_Covered;
if ( error == HB_Err_Not_Covered )
buffer->in_pos--;
}
while ((HB_Int) buffer->in_pos >= 0);
return retError;
/*case HB_GSUB_LOOKUP_EXTENSION:*/
default:
return retError;
};
}
HB_Error HB_GSUB_Add_Feature( HB_GSUBHeader* gsub,
HB_UShort feature_index,
HB_UInt property )
{
HB_UShort i;
HB_Feature feature;
HB_UInt* properties;
HB_UShort* index;
HB_UShort lookup_count;
/* Each feature can only be added once */
if ( !gsub ||
feature_index >= gsub->FeatureList.FeatureCount ||
gsub->FeatureList.ApplyCount == gsub->FeatureList.FeatureCount )
return ERR(HB_Err_Invalid_Argument);
gsub->FeatureList.ApplyOrder[gsub->FeatureList.ApplyCount++] = feature_index;
properties = gsub->LookupList.Properties;
feature = gsub->FeatureList.FeatureRecord[feature_index].Feature;
index = feature.LookupListIndex;
lookup_count = gsub->LookupList.LookupCount;
for ( i = 0; i < feature.LookupListCount; i++ )
{
HB_UShort lookup_index = index[i];
if (lookup_index < lookup_count)
properties[lookup_index] |= property;
}
return HB_Err_Ok;
}
HB_Error HB_GSUB_Clear_Features( HB_GSUBHeader* gsub )
{
HB_UShort i;
HB_UInt* properties;
if ( !gsub )
return ERR(HB_Err_Invalid_Argument);
gsub->FeatureList.ApplyCount = 0;
properties = gsub->LookupList.Properties;
for ( i = 0; i < gsub->LookupList.LookupCount; i++ )
properties[i] = 0;
return HB_Err_Ok;
}
HB_Error HB_GSUB_Register_Alternate_Function( HB_GSUBHeader* gsub,
HB_AltFunction altfunc,
void* data )
{
if ( !gsub )
return ERR(HB_Err_Invalid_Argument);
gsub->altfunc = altfunc;
gsub->data = data;
return HB_Err_Ok;
}
/* returns error if one happened, otherwise returns HB_Err_Not_Covered if no
* feature were applied, or HB_Err_Ok otherwise.
*/
HB_Error HB_GSUB_Apply_String( HB_GSUBHeader* gsub,
HB_Buffer buffer )
{
HB_Error error, retError = HB_Err_Not_Covered;
int i, j, lookup_count, num_features;
if ( !gsub ||
!buffer)
return ERR(HB_Err_Invalid_Argument);
if ( buffer->in_length == 0 )
return retError;
lookup_count = gsub->LookupList.LookupCount;
num_features = gsub->FeatureList.ApplyCount;
for ( i = 0; i < num_features; i++)
{
HB_UShort feature_index = gsub->FeatureList.ApplyOrder[i];
HB_Feature feature = gsub->FeatureList.FeatureRecord[feature_index].Feature;
for ( j = 0; j < feature.LookupListCount; j++ )
{
HB_UShort lookup_index = feature.LookupListIndex[j];
/* Skip nonexistant lookups */
if (lookup_index >= lookup_count)
continue;
error = GSUB_Do_String_Lookup( gsub, lookup_index, buffer );
if ( error )
{
if ( error != HB_Err_Not_Covered )
return error;
}
else
retError = error;
}
}
error = retError;
return error;
}
/* END */
