cffparse.c

奇趣公司比较新的qt/emd版本

        matrix->yy = FT_DivFix( matrix->yy, temp );
        offset->x  = FT_DivFix( offset->x,  temp );
        offset->y  = FT_DivFix( offset->y,  temp );
      }

      /* note that the offsets must be expressed in integer font units */
      offset->x >>= 16;
      offset->y >>= 16;

      error = CFF_Err_Ok;
    }

    return error;
  }


  static FT_Error
  cff_parse_font_bbox( CFF_Parser  parser )
  {
    CFF_FontRecDict  dict = (CFF_FontRecDict)parser->object;
    FT_BBox*         bbox = &dict->font_bbox;
    FT_Byte**        data = parser->stack;
    FT_Error         error;


    error = CFF_Err_Stack_Underflow;

    if ( parser->top >= parser->stack + 4 )
    {
      bbox->xMin = FT_RoundFix( cff_parse_fixed( data++ ) );
      bbox->yMin = FT_RoundFix( cff_parse_fixed( data++ ) );
      bbox->xMax = FT_RoundFix( cff_parse_fixed( data++ ) );
      bbox->yMax = FT_RoundFix( cff_parse_fixed( data   ) );
      error = CFF_Err_Ok;
    }

    return error;
  }


  static FT_Error
  cff_parse_private_dict( CFF_Parser  parser )
  {
    CFF_FontRecDict  dict = (CFF_FontRecDict)parser->object;
    FT_Byte**        data = parser->stack;
    FT_Error         error;


    error = CFF_Err_Stack_Underflow;

    if ( parser->top >= parser->stack + 2 )
    {
      dict->private_size   = cff_parse_num( data++ );
      dict->private_offset = cff_parse_num( data   );
      error = CFF_Err_Ok;
    }

    return error;
  }


  static FT_Error
  cff_parse_cid_ros( CFF_Parser  parser )
  {
    CFF_FontRecDict  dict = (CFF_FontRecDict)parser->object;
    FT_Byte**        data = parser->stack;
    FT_Error         error;


    error = CFF_Err_Stack_Underflow;

    if ( parser->top >= parser->stack + 3 )
    {
      dict->cid_registry   = (FT_UInt)cff_parse_num ( data++ );
      dict->cid_ordering   = (FT_UInt)cff_parse_num ( data++ );
      dict->cid_supplement = (FT_ULong)cff_parse_num( data );
      error = CFF_Err_Ok;
    }

    return error;
  }


#define CFF_FIELD_NUM( code, name ) \
          CFF_FIELD( code, name, cff_kind_num )
#define CFF_FIELD_FIXED( code, name ) \
          CFF_FIELD( code, name, cff_kind_fixed )
#define CFF_FIELD_FIXED_1000( code, name ) \
          CFF_FIELD( code, name, cff_kind_fixed_thousand )
#define CFF_FIELD_STRING( code, name ) \
          CFF_FIELD( code, name, cff_kind_string )
#define CFF_FIELD_BOOL( code, name ) \
          CFF_FIELD( code, name, cff_kind_bool )
#define CFF_FIELD_DELTA( code, name, max ) \
          CFF_FIELD( code, name, cff_kind_delta )

#define CFF_FIELD_CALLBACK( code, name ) \
          {                              \
            cff_kind_callback,           \
            code | CFFCODE,              \
            0, 0,                        \
            cff_parse_ ## name,          \
            0, 0                         \
          },

#undef  CFF_FIELD
#define CFF_FIELD( code, name, kind ) \
          {                          \
            kind,                    \
            code | CFFCODE,          \
            FT_FIELD_OFFSET( name ), \
            FT_FIELD_SIZE( name ),   \
            0, 0, 0                  \
          },

#undef  CFF_FIELD_DELTA
#define CFF_FIELD_DELTA( code, name, max ) \
        {                                  \
          cff_kind_delta,                  \
          code | CFFCODE,                  \
          FT_FIELD_OFFSET( name ),         \
          FT_FIELD_SIZE_DELTA( name ),     \
          0,                               \
          max,                             \
          FT_FIELD_OFFSET( num_ ## name )  \
        },

#define CFFCODE_TOPDICT  0x1000
#define CFFCODE_PRIVATE  0x2000

  static const CFF_Field_Handler  cff_field_handlers[] =
  {

#include "cfftoken.h"

    { 0, 0, 0, 0, 0, 0, 0 }
  };


  FT_LOCAL_DEF( FT_Error )
  cff_parser_run( CFF_Parser  parser,
                  FT_Byte*    start,
                  FT_Byte*    limit )
  {
    FT_Byte*  p     = start;
    FT_Error  error = CFF_Err_Ok;


    parser->top    = parser->stack;
    parser->start  = start;
    parser->limit  = limit;
    parser->cursor = start;

    while ( p < limit )
    {
      FT_UInt  v = *p;


      if ( v >= 27 && v != 31 )
      {
        /* it's a number; we will push its position on the stack */
        if ( parser->top - parser->stack >= CFF_MAX_STACK_DEPTH )
          goto Stack_Overflow;

        *parser->top ++ = p;

        /* now, skip it */
        if ( v == 30 )
        {
          /* skip real number */
          p++;
          for (;;)
          {
            if ( p >= limit )
              goto Syntax_Error;
            v = p[0] >> 4;
            if ( v == 15 )
              break;
            v = p[0] & 0xF;
            if ( v == 15 )
              break;
            p++;
          }
        }
        else if ( v == 28 )
          p += 2;
        else if ( v == 29 )
          p += 4;
        else if ( v > 246 )
          p += 1;
      }
      else
      {
        /* This is not a number, hence it's an operator.  Compute its code */
        /* and look for it in our current list.                            */

        FT_UInt                   code;
        FT_UInt                   num_args = (FT_UInt)
                                             ( parser->top - parser->stack );
        const CFF_Field_Handler*  field;


        *parser->top = p;
        code = v;
        if ( v == 12 )
        {
          /* two byte operator */
          p++;
          if ( p >= limit )
            goto Syntax_Error;

          code = 0x100 | p[0];
        }
        code = code | parser->object_code;

        for ( field = cff_field_handlers; field->kind; field++ )
        {
          if ( field->code == (FT_Int)code )
          {
            /* we found our field's handler; read it */
            FT_Long   val;
            FT_Byte*  q = (FT_Byte*)parser->object + field->offset;


            /* check that we have enough arguments -- except for */
            /* delta encoded arrays, which can be empty          */
            if ( field->kind != cff_kind_delta && num_args < 1 )
              goto Stack_Underflow;

            switch ( field->kind )
            {
            case cff_kind_bool:
            case cff_kind_string:
            case cff_kind_num:
              val = cff_parse_num( parser->stack );
              goto Store_Number;

            case cff_kind_fixed:
              val = cff_parse_fixed( parser->stack );
              goto Store_Number;

            case cff_kind_fixed_thousand:
              val = cff_parse_fixed_thousand( parser->stack );

            Store_Number:
              switch ( field->size )
              {
              case (8 / FT_CHAR_BIT):
                *(FT_Byte*)q = (FT_Byte)val;
                break;

              case (16 / FT_CHAR_BIT):
                *(FT_Short*)q = (FT_Short)val;
                break;

              case (32 / FT_CHAR_BIT):
                *(FT_Int32*)q = (FT_Int)val;
                break;

              default:  /* for 64-bit systems */
                *(FT_Long*)q = val;
              }
              break;

            case cff_kind_delta:
              {
                FT_Byte*   qcount = (FT_Byte*)parser->object +
                                      field->count_offset;

                FT_Byte**  data = parser->stack;


                if ( num_args > field->array_max )
                  num_args = field->array_max;

                /* store count */
                *qcount = (FT_Byte)num_args;

                val = 0;
                while ( num_args > 0 )
                {
                  val += cff_parse_num( data++ );
                  switch ( field->size )
                  {
                  case (8 / FT_CHAR_BIT):
                    *(FT_Byte*)q = (FT_Byte)val;
                    break;

                  case (16 / FT_CHAR_BIT):
                    *(FT_Short*)q = (FT_Short)val;
                    break;

                  case (32 / FT_CHAR_BIT):
                    *(FT_Int32*)q = (FT_Int)val;
                    break;

                  default:  /* for 64-bit systems */
                    *(FT_Long*)q = val;
                  }

                  q += field->size;
                  num_args--;
                }
              }
              break;

            default:  /* callback */
              error = field->reader( parser );
              if ( error )
                goto Exit;
            }
            goto Found;
          }
        }

        /* this is an unknown operator, or it is unsupported; */
        /* we will ignore it for now.                         */

      Found:
        /* clear stack */
        parser->top = parser->stack;
      }
      p++;
    }

  Exit:
    return error;

  Stack_Overflow:
    error = CFF_Err_Invalid_Argument;
    goto Exit;

  Stack_Underflow:
    error = CFF_Err_Invalid_Argument;
    goto Exit;

  Syntax_Error:
    error = CFF_Err_Invalid_Argument;
    goto Exit;
  }


/* END */