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/***************************************************************************/
/* */
/* pfrcmap.c */
/* */
/* FreeType PFR cmap handling (body). */
/* */
/* Copyright 2002, 2007 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 "pfrcmap.h"
#include "pfrobjs.h"
#include <freetype/internal/ftdebug.h>
#include "pfrerror.h"
FT_CALLBACK_DEF( FT_Error )
pfr_cmap_init( PFR_CMap cmap )
{
FT_Error error = PFR_Err_Ok;
PFR_Face face = (PFR_Face)FT_CMAP_FACE( cmap );
cmap->num_chars = face->phy_font.num_chars;
cmap->chars = face->phy_font.chars;
/* just for safety, check that the character entries are correctly */
/* sorted in increasing character code order */
{
FT_UInt n;
for ( n = 1; n < cmap->num_chars; n++ )
{
if ( cmap->chars[n - 1].char_code >= cmap->chars[n].char_code )
{
error = PFR_Err_Invalid_Table;
goto Exit;
}
}
}
Exit:
return error;
}
FT_CALLBACK_DEF( void )
pfr_cmap_done( PFR_CMap cmap )
{
cmap->chars = NULL;
cmap->num_chars = 0;
}
FT_CALLBACK_DEF( FT_UInt )
pfr_cmap_char_index( PFR_CMap cmap,
FT_UInt32 char_code )
{
FT_UInt min = 0;
FT_UInt max = cmap->num_chars;
FT_UInt mid;
PFR_Char gchar;
while ( min < max )
{
mid = min + ( max - min ) / 2;
gchar = cmap->chars + mid;
if ( gchar->char_code == char_code )
return mid + 1;
if ( gchar->char_code < char_code )
min = mid + 1;
else
max = mid;
}
return 0;
}
FT_CALLBACK_DEF( FT_UInt )
pfr_cmap_char_next( PFR_CMap cmap,
FT_UInt32 *pchar_code )
{
FT_UInt result = 0;
FT_UInt32 char_code = *pchar_code + 1;
Restart:
{
FT_UInt min = 0;
FT_UInt max = cmap->num_chars;
FT_UInt mid;
PFR_Char gchar;
while ( min < max )
{
mid = min + ( ( max - min ) >> 1 );
gchar = cmap->chars + mid;
if ( gchar->char_code == char_code )
{
result = mid;
if ( result != 0 )
{
result++;
goto Exit;
}
char_code++;
goto Restart;
}
if ( gchar->char_code < char_code )
min = mid+1;
else
max = mid;
}
/* we didn't find it, but we have a pair just above it */
char_code = 0;
if ( min < cmap->num_chars )
{
gchar = cmap->chars + min;
result = min;
if ( result != 0 )
{
result++;
char_code = gchar->char_code;
}
}
}
Exit:
*pchar_code = char_code;
return result;
}
FT_CALLBACK_TABLE_DEF const FT_CMap_ClassRec
pfr_cmap_class_rec =
{
sizeof ( PFR_CMapRec ),
(FT_CMap_InitFunc) pfr_cmap_init,
(FT_CMap_DoneFunc) pfr_cmap_done,
(FT_CMap_CharIndexFunc)pfr_cmap_char_index,
(FT_CMap_CharNextFunc) pfr_cmap_char_next,
NULL, NULL, NULL, NULL, NULL
};
/* END */
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