/***************************************************************************/
/*                                                                         */
/*  t1cmap.c                                                               */
/*                                                                         */
/*    Type 1 character map support (body).                                 */
/*                                                                         */
/*  Copyright 2002 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 "t1cmap.h"

#include FT_INTERNAL_DEBUG_H


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****          TYPE1 STANDARD (AND EXPERT) ENCODING CMAPS           *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  static void
  t1_cmap_std_init( T1_CMapStd  cmap,
                    FT_Int      is_expert )
  {
    T1_Face          face    = (T1_Face)FT_CMAP_FACE( cmap );
    PSNames_Service  psnames = (PSNames_Service)face->psnames;


    cmap->num_glyphs    = face->type1.num_glyphs;
    cmap->glyph_names   = (const char* const*)face->type1.glyph_names;
    cmap->sid_to_string = psnames->adobe_std_strings;
    cmap->code_to_sid   = is_expert ? psnames->adobe_expert_encoding
                                    : psnames->adobe_std_encoding;

    FT_ASSERT( cmap->code_to_sid != NULL );
  }


  FT_CALLBACK_DEF( void )
  t1_cmap_std_done( T1_CMapStd  cmap )
  {
    cmap->num_glyphs    = 0;
    cmap->glyph_names   = NULL;
    cmap->sid_to_string = NULL;
    cmap->code_to_sid   = NULL;
  }


  FT_CALLBACK_DEF( FT_UInt )
  t1_cmap_std_char_index( T1_CMapStd  cmap,
                          FT_UInt32   char_code )
  {
    FT_UInt  result = 0;


    if ( char_code < 256 )
    {
      FT_UInt      code, n;
      const char*  glyph_name;


      /* convert character code to Adobe SID string */
      code       = cmap->code_to_sid[char_code];
      glyph_name = cmap->sid_to_string( code );

      /* look for the corresponding glyph name */
      for ( n = 0; n < cmap->num_glyphs; n++ )
      {
        const char* gname = cmap->glyph_names[n];


        if ( gname && gname[0] == glyph_name[0]  &&
             ft_strcmp( gname, glyph_name ) == 0 )
        {
          result = n;
          break;
        }
      }
    }

    return result;
  }


  FT_CALLBACK_DEF( FT_UInt )
  t1_cmap_std_char_next( T1_CMapStd   cmap,
                         FT_UInt32   *pchar_code )
  {
    FT_UInt    result    = 0;
    FT_UInt32  char_code = *pchar_code + 1;


    while ( char_code < 256 )
    {
      result = t1_cmap_std_char_index( cmap, char_code );
      if ( result != 0 )
        goto Exit;

      char_code++;
    }
    char_code = 0;

  Exit:
    *pchar_code = char_code;
    return result;
  }


  FT_CALLBACK_DEF( FT_Error )
  t1_cmap_standard_init( T1_CMapStd  cmap )
  {
    t1_cmap_std_init( cmap, 0 );
    return 0;
  }


  FT_CALLBACK_TABLE_DEF const FT_CMap_ClassRec
  t1_cmap_standard_class_rec =
  {
    sizeof ( T1_CMapStdRec ),

    (FT_CMap_InitFunc)     t1_cmap_standard_init,
    (FT_CMap_DoneFunc)     t1_cmap_std_done,
    (FT_CMap_CharIndexFunc)t1_cmap_std_char_index,
    (FT_CMap_CharNextFunc) t1_cmap_std_char_next
  };


  FT_CALLBACK_DEF( FT_Error )
  t1_cmap_expert_init( T1_CMapStd  cmap )
  {
    t1_cmap_std_init( cmap, 1 );
    return 0;
  }

  FT_CALLBACK_TABLE_DEF const FT_CMap_ClassRec
  t1_cmap_expert_class_rec =
  {
    sizeof ( T1_CMapStdRec ),

    (FT_CMap_InitFunc)     t1_cmap_expert_init,
    (FT_CMap_DoneFunc)     t1_cmap_std_done,
    (FT_CMap_CharIndexFunc)t1_cmap_std_char_index,
    (FT_CMap_CharNextFunc) t1_cmap_std_char_next
  };


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                    TYPE1 CUSTOM ENCODING CMAP                 *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/


  FT_CALLBACK_DEF( FT_Error )
  t1_cmap_custom_init( T1_CMapCustom  cmap )
  {
    T1_Face      face     = (T1_Face)FT_CMAP_FACE( cmap );
    T1_Encoding  encoding = &face->type1.encoding;


    cmap->first   = encoding->code_first;
    cmap->count   = (FT_UInt)( encoding->code_last - cmap->first + 1 );
    cmap->indices = encoding->char_index;

    FT_ASSERT( cmap->indices != NULL );
    FT_ASSERT( encoding->code_first <= encoding->code_last );

    return 0;
  }


  FT_CALLBACK_DEF( void )
  t1_cmap_custom_done( T1_CMapCustom  cmap )
  {
    cmap->indices = NULL;
    cmap->first   = 0;
    cmap->count   = 0;
  }


  FT_CALLBACK_DEF( FT_UInt )
  t1_cmap_custom_char_index( T1_CMapCustom  cmap,
                             FT_UInt32      char_code )
  {
    FT_UInt    result = 0;
    FT_UInt32  idx;


    idx = (FT_UInt32)( char_code - cmap->first );
    if ( idx < cmap->count )
      result = cmap->indices[idx];

    return result;
  }


  FT_CALLBACK_DEF( FT_UInt )
  t1_cmap_custom_char_next( T1_CMapCustom  cmap,
                            FT_UInt32     *pchar_code )
  {
    FT_UInt    result = 0;
    FT_UInt32  char_code = *pchar_code;
    FT_UInt32  idx;


    ++char_code;

    if ( char_code < cmap->first )
      char_code = cmap->first;

    idx = (FT_UInt32)( char_code - cmap->first );
    for ( ; idx < cmap->count; idx++, char_code++ )
    {
      result = cmap->indices[idx];
      if ( result != 0 )
        goto Exit;
    }

    char_code = 0;

  Exit:
    *pchar_code = char_code;
    return result;
  }


  FT_CALLBACK_TABLE_DEF const FT_CMap_ClassRec
  t1_cmap_custom_class_rec =
  {
    sizeof ( T1_CMapCustomRec ),

    (FT_CMap_InitFunc)     t1_cmap_custom_init,
    (FT_CMap_DoneFunc)     t1_cmap_custom_done,
    (FT_CMap_CharIndexFunc)t1_cmap_custom_char_index,
    (FT_CMap_CharNextFunc) t1_cmap_custom_char_next
  };


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****            TYPE1 SYNTHETIC UNICODE ENCODING CMAP              *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  FT_CALLBACK_DEF( FT_Int )
  t1_cmap_uni_pair_compare( const void*  pair1,
                            const void*  pair2 )
  {
    FT_UInt32  u1 = ((T1_CMapUniPair)pair1)->unicode;
    FT_UInt32  u2 = ((T1_CMapUniPair)pair2)->unicode;
    

    if ( u1 < u2 )
      return -1;
      
    if ( u1 > u2 )
      return +1;
      
    return 0;
  }                            


  FT_CALLBACK_DEF( FT_Error )
  t1_cmap_unicode_init( T1_CMapUnicode  cmap )
  {
    FT_Error         error;
    FT_UInt          count;
    T1_Face          face    = (T1_Face)FT_CMAP_FACE( cmap );
    FT_Memory        memory  = FT_FACE_MEMORY( face );
    PSNames_Service  psnames = (PSNames_Service)face->psnames;


    cmap->num_pairs = 0;
    cmap->pairs     = NULL;

    count = face->type1.num_glyphs;

    if ( !FT_NEW_ARRAY( cmap->pairs, count ) )
    {
      FT_UInt         n, new_count;
      T1_CMapUniPair  pair;
      FT_UInt32       uni_code;


      pair = cmap->pairs;
      for ( n = 0; n < count; n++ )
      {
        const char*  gname = face->type1.glyph_names[n];


        /* build unsorted pair table by matching glyph names */
        if ( gname )
        {
          uni_code = psnames->unicode_value( gname );

          if ( uni_code != 0 )
          {
            pair->unicode = uni_code;
            pair->gindex  = n;
            pair++;
          }
        }
      }
      
      new_count = (FT_UInt)( pair - cmap->pairs );
      if ( new_count == 0 )
      {
        /* there are no unicode characters in here! */
        FT_FREE( cmap->pairs );
        error = FT_Err_Invalid_Argument;
      }
      else
      {
        /* re-allocate if the new array is much smaller than the original */
        /* one                                                            */
        if ( new_count != count && new_count < count / 2 )
        {
          (void)FT_RENEW_ARRAY( cmap->pairs, count, new_count );
          error = 0;
        }

        /* sort the pairs table to allow efficient binary searches */
        ft_qsort( cmap->pairs,
                  new_count,
                  sizeof ( T1_CMapUniPairRec ),
                  t1_cmap_uni_pair_compare );

        cmap->num_pairs = new_count;
      }
    }

    return error;
  }


  FT_CALLBACK_DEF( void )
  t1_cmap_unicode_done( T1_CMapUnicode  cmap )
  {
    FT_Face    face   = FT_CMAP_FACE(cmap);
    FT_Memory  memory = FT_FACE_MEMORY(face);

    FT_FREE( cmap->pairs );
    cmap->num_pairs = 0;
  }


  FT_CALLBACK_DEF( FT_UInt )
  t1_cmap_unicode_char_index( T1_CMapUnicode  cmap,
                              FT_UInt32       char_code )
  {
    FT_UInt         min = 0;
    FT_UInt         max = cmap->num_pairs;
    FT_UInt         mid;
    T1_CMapUniPair  pair;


    while ( min < max )
    {
      mid  = min + ( max - min ) / 2;
      pair = cmap->pairs + mid;

      if ( pair->unicode == char_code )
        return pair->gindex;

      if ( pair->unicode < char_code )
        min = mid + 1;
      else
        max = mid;
    }
    return 0;
  }


  FT_CALLBACK_DEF( FT_UInt )
  t1_cmap_unicode_char_next( T1_CMapUnicode  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_pairs;
      FT_UInt         mid;
      T1_CMapUniPair  pair;


      while ( min < max )
      {
        mid  = min + ( ( max - min ) >> 1 );
        pair = cmap->pairs + mid;

        if ( pair->unicode == char_code )
        {
          result = pair->gindex;
          if ( result != 0 )
            goto Exit;

          char_code++;
          goto Restart;
        }

        if ( pair->unicode < 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_pairs )
      {
        pair   = cmap->pairs + min;
        result = pair->gindex;
        if ( result != 0 )
          char_code = pair->unicode;
      }
    }

  Exit:
    *pchar_code = char_code;
    return result;
  }


  FT_CALLBACK_TABLE_DEF const FT_CMap_ClassRec
  t1_cmap_unicode_class_rec =
  {
    sizeof ( T1_CMapUnicodeRec ),

    (FT_CMap_InitFunc)     t1_cmap_unicode_init,
    (FT_CMap_DoneFunc)     t1_cmap_unicode_done,
    (FT_CMap_CharIndexFunc)t1_cmap_unicode_char_index,
    (FT_CMap_CharNextFunc) t1_cmap_unicode_char_next
  };


/* END */