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/***************************************************************************/
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/* */
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/* pfrcmap.c */
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/* */
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/* FreeType PFR cmap handling (body). */
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/* */
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/* Copyright 2002, 2007, 2009 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#include "pfrcmap.h"
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#include "pfrobjs.h"
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#include "pfrerror.h"
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FT_CALLBACK_DEF( FT_Error )
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pfr_cmap_init( PFR_CMap cmap )
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{
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FT_Error error = PFR_Err_Ok;
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PFR_Face face = (PFR_Face)FT_CMAP_FACE( cmap );
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cmap->num_chars = face->phy_font.num_chars;
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cmap->chars = face->phy_font.chars;
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/* just for safety, check that the character entries are correctly */
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/* sorted in increasing character code order */
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{
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FT_UInt n;
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for ( n = 1; n < cmap->num_chars; n++ )
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{
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if ( cmap->chars[n - 1].char_code >= cmap->chars[n].char_code )
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{
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error = PFR_Err_Invalid_Table;
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goto Exit;
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}
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}
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}
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Exit:
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return error;
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}
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FT_CALLBACK_DEF( void )
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pfr_cmap_done( PFR_CMap cmap )
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{
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cmap->chars = NULL;
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cmap->num_chars = 0;
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}
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FT_CALLBACK_DEF( FT_UInt )
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pfr_cmap_char_index( PFR_CMap cmap,
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FT_UInt32 char_code )
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{
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FT_UInt min = 0;
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FT_UInt max = cmap->num_chars;
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FT_UInt mid;
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PFR_Char gchar;
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while ( min < max )
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{
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mid = min + ( max - min ) / 2;
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gchar = cmap->chars + mid;
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if ( gchar->char_code == char_code )
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return mid + 1;
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if ( gchar->char_code < char_code )
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min = mid + 1;
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else
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max = mid;
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}
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return 0;
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}
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FT_CALLBACK_DEF( FT_UInt32 )
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pfr_cmap_char_next( PFR_CMap cmap,
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FT_UInt32 *pchar_code )
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{
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FT_UInt result = 0;
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FT_UInt32 char_code = *pchar_code + 1;
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Restart:
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{
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FT_UInt min = 0;
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FT_UInt max = cmap->num_chars;
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FT_UInt mid;
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PFR_Char gchar;
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while ( min < max )
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{
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mid = min + ( ( max - min ) >> 1 );
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gchar = cmap->chars + mid;
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if ( gchar->char_code == char_code )
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{
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result = mid;
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if ( result != 0 )
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{
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result++;
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goto Exit;
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}
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char_code++;
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goto Restart;
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}
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if ( gchar->char_code < char_code )
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min = mid+1;
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else
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max = mid;
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}
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/* we didn't find it, but we have a pair just above it */
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char_code = 0;
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if ( min < cmap->num_chars )
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{
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gchar = cmap->chars + min;
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result = min;
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if ( result != 0 )
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{
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result++;
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char_code = gchar->char_code;
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}
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}
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}
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Exit:
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*pchar_code = char_code;
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return result;
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}
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FT_CALLBACK_TABLE_DEF const FT_CMap_ClassRec
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pfr_cmap_class_rec =
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{
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sizeof ( PFR_CMapRec ),
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(FT_CMap_InitFunc) pfr_cmap_init,
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(FT_CMap_DoneFunc) pfr_cmap_done,
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(FT_CMap_CharIndexFunc)pfr_cmap_char_index,
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(FT_CMap_CharNextFunc) pfr_cmap_char_next,
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NULL, NULL, NULL, NULL, NULL
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};
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/* END */
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