/***************************************************************************/
/*                                                                         */
/*  cidload.c                                                              */
/*                                                                         */
/*    CID-keyed Type1 font loader (body).                                  */
/*                                                                         */
/*  Copyright 1996-2001, 2002, 2003, 2004, 2005 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 <ft2build.h>
#include FT_INTERNAL_DEBUG_H
#include FT_CONFIG_CONFIG_H
#include FT_MULTIPLE_MASTERS_H
#include FT_INTERNAL_TYPE1_TYPES_H

#include "cidload.h"

#include "ciderrs.h"


  /*************************************************************************/
  /*                                                                       */
  /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
  /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
  /* messages during execution.                                            */
  /*                                                                       */
#undef  FT_COMPONENT
#define FT_COMPONENT  trace_cidload


  /* read a single offset */
  FT_LOCAL_DEF( FT_Long )
  cid_get_offset( FT_Byte*  *start,
                  FT_Byte    offsize )
  {
    FT_Long   result;
    FT_Byte*  p = *start;


    for ( result = 0; offsize > 0; offsize-- )
    {
      result <<= 8;
      result  |= *p++;
    }

    *start = p;
    return result;
  }


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                    TYPE 1 SYMBOL PARSING                      *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/


  static FT_Error
  cid_load_keyword( CID_Face        face,
                    CID_Loader*     loader,
                    const T1_Field  keyword )
  {
    FT_Error      error;
    CID_Parser*   parser = &loader->parser;
    FT_Byte*      object;
    void*         dummy_object;
    CID_FaceInfo  cid = &face->cid;


    /* if the keyword has a dedicated callback, call it */
    if ( keyword->type == T1_FIELD_TYPE_CALLBACK )
    {
      keyword->reader( (FT_Face)face, parser );
      error = parser->root.error;
      goto Exit;
    }

    /* we must now compute the address of our target object */
    switch ( keyword->location )
    {
    case T1_FIELD_LOCATION_CID_INFO:
      object = (FT_Byte*)cid;
      break;

    case T1_FIELD_LOCATION_FONT_INFO:
      object = (FT_Byte*)&cid->font_info;
      break;

    case T1_FIELD_LOCATION_BBOX:
      object = (FT_Byte*)&cid->font_bbox;
      break;

    default:
      {
        CID_FaceDict  dict;


        if ( parser->num_dict < 0 )
        {
          FT_ERROR(( "cid_load_keyword: invalid use of `%s'!\n",
                     keyword->ident ));
          error = CID_Err_Syntax_Error;
          goto Exit;
        }

        dict = cid->font_dicts + parser->num_dict;
        switch ( keyword->location )
        {
        case T1_FIELD_LOCATION_PRIVATE:
          object = (FT_Byte*)&dict->private_dict;
          break;

        default:
          object = (FT_Byte*)dict;
        }
      }
    }

    dummy_object = object;

    /* now, load the keyword data in the object's field(s) */
    if ( keyword->type == T1_FIELD_TYPE_INTEGER_ARRAY ||
         keyword->type == T1_FIELD_TYPE_FIXED_ARRAY   )
      error = cid_parser_load_field_table( &loader->parser, keyword,
                                           &dummy_object );
    else
      error = cid_parser_load_field( &loader->parser,
                                     keyword, &dummy_object );
  Exit:
    return error;
  }


  FT_CALLBACK_DEF( FT_Error )
  parse_font_matrix( CID_Face     face,
                     CID_Parser*  parser )
  {
    FT_Matrix*    matrix;
    FT_Vector*    offset;
    CID_FaceDict  dict;
    FT_Face       root = (FT_Face)&face->root;
    FT_Fixed      temp[6];
    FT_Fixed      temp_scale;


    if ( parser->num_dict >= 0 )
    {
      dict   = face->cid.font_dicts + parser->num_dict;
      matrix = &dict->font_matrix;
      offset = &dict->font_offset;

      (void)cid_parser_to_fixed_array( parser, 6, temp, 3 );

      temp_scale = FT_ABS( temp[3] );

      /* Set units per EM based on FontMatrix values.  We set the value to */
      /* `1000/temp_scale', because temp_scale was already multiplied by   */
      /* 1000 (in `t1_tofixed', from psobjs.c).                            */
      root->units_per_EM = (FT_UShort)( FT_DivFix( 0x10000L,
                                        FT_DivFix( temp_scale, 1000 ) ) );

      /* we need to scale the values by 1.0/temp[3] */
      if ( temp_scale != 0x10000L )
      {
        temp[0] = FT_DivFix( temp[0], temp_scale );
        temp[1] = FT_DivFix( temp[1], temp_scale );
        temp[2] = FT_DivFix( temp[2], temp_scale );
        temp[4] = FT_DivFix( temp[4], temp_scale );
        temp[5] = FT_DivFix( temp[5], temp_scale );
        temp[3] = 0x10000L;
      }

      matrix->xx = temp[0];
      matrix->yx = temp[1];
      matrix->xy = temp[2];
      matrix->yy = temp[3];

      /* note that the font offsets are expressed in integer font units */
      offset->x  = temp[4] >> 16;
      offset->y  = temp[5] >> 16;
    }

    return CID_Err_Ok;      /* this is a callback function; */
                            /* we must return an error code */
  }


  FT_CALLBACK_DEF( FT_Error )
  parse_fd_array( CID_Face     face,
                  CID_Parser*  parser )
  {
    CID_FaceInfo  cid    = &face->cid;
    FT_Memory     memory = face->root.memory;
    FT_Error      error  = CID_Err_Ok;
    FT_Long       num_dicts;


    num_dicts = cid_parser_to_int( parser );

    if ( !cid->font_dicts )
    {
      FT_Int  n;


      if ( FT_NEW_ARRAY( cid->font_dicts, num_dicts ) )
        goto Exit;

      cid->num_dicts = (FT_UInt)num_dicts;

      /* don't forget to set a few defaults */
      for ( n = 0; n < cid->num_dicts; n++ )
      {
        CID_FaceDict  dict = cid->font_dicts + n;


        /* default value for lenIV */
        dict->private_dict.lenIV = 4;
      }
    }

  Exit:
    return error;
  }


  static
  const T1_FieldRec  cid_field_records[] =
  {

#include "cidtoken.h"

    T1_FIELD_CALLBACK( "FDArray",    parse_fd_array )
    T1_FIELD_CALLBACK( "FontMatrix", parse_font_matrix )

    { 0, T1_FIELD_LOCATION_CID_INFO, T1_FIELD_TYPE_NONE, 0, 0, 0, 0, 0 }
  };


  static FT_Error
  cid_parse_dict( CID_Face     face,
                  CID_Loader*  loader,
                  FT_Byte*     base,
                  FT_Long      size )
  {
    CID_Parser*  parser = &loader->parser;


    parser->root.cursor = base;
    parser->root.limit  = base + size;
    parser->root.error  = CID_Err_Ok;

    {
      FT_Byte*  cur   = base;
      FT_Byte*  limit = cur + size;


      for (;;)
      {
        FT_Byte*  newlimit;


        parser->root.cursor = cur;
        cid_parser_skip_spaces( parser );

        if ( parser->root.cursor >= limit )
          newlimit = limit - 1 - 17;
        else
          newlimit = parser->root.cursor - 17;

        /* look for `%ADOBeginFontDict' */
        for ( ; cur < newlimit; cur++ )
        {
          if ( *cur == '%'                                            &&
               ft_strncmp( (char*)cur, "%ADOBeginFontDict", 17 ) == 0 )
          {
            /* if /FDArray was found, then cid->num_dicts is > 0, and */
            /* we can start increasing parser->num_dict               */
            if ( face->cid.num_dicts > 0 )
              parser->num_dict++;
          }
        }

        cur = parser->root.cursor;
        /* no error can occur in cid_parser_skip_spaces */
        if ( cur >= limit )
          break;

        cid_parser_skip_PS_token( parser );
        if ( parser->root.cursor >= limit || parser->root.error )
          break;

        /* look for immediates */
        if ( *cur == '/' && cur + 2 < limit )
        {
          FT_PtrDist  len;


          cur++;
          len = parser->root.cursor - cur;

          if ( len > 0 && len < 22 )
          {
            /* now compare the immediate name to the keyword table */
            T1_Field  keyword = (T1_Field)cid_field_records;


            for (;;)
            {
              FT_Byte*  name;


              name = (FT_Byte*)keyword->ident;