kc3-lang/freetype/src/pcf/pcfread.c

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• Hash : 999bcee2
  Author :
  Date : 2016-06-26T08:27:29
  

  [pcf] Fix handling of very large fonts (#47708). * src/pcf/pcfread.c (pcf_get_encodings): Make `encodingOffset' an unsigned short. Only reject `0xFFFF' as an invalid encoding offset.

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• src/pcf/pcfread.c

• /*  pcfread.c
  
      FreeType font driver for pcf fonts
  
    Copyright 2000-2010, 2012-2014 by
    Francesco Zappa Nardelli
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.
  */
  
  
  #include <ft2build.h>
  
  #include FT_INTERNAL_DEBUG_H
  #include FT_INTERNAL_STREAM_H
  #include FT_INTERNAL_OBJECTS_H
  
  #include "pcf.h"
  #include "pcfread.h"
  
  #include "pcferror.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_pcfread
  
  
  #ifdef FT_DEBUG_LEVEL_TRACE
    static const char* const  tableNames[] =
    {
      "prop", "accl", "mtrcs", "bmps", "imtrcs",
      "enc", "swidth", "names", "accel"
    };
  #endif
  
  
    static
    const FT_Frame_Field  pcf_toc_header[] =
    {
  #undef  FT_STRUCTURE
  #define FT_STRUCTURE  PCF_TocRec
  
      FT_FRAME_START( 8 ),
        FT_FRAME_ULONG_LE( version ),
        FT_FRAME_ULONG_LE( count ),
      FT_FRAME_END
    };
  
  
    static
    const FT_Frame_Field  pcf_table_header[] =
    {
  #undef  FT_STRUCTURE
  #define FT_STRUCTURE  PCF_TableRec
  
      FT_FRAME_START( 16  ),
        FT_FRAME_ULONG_LE( type ),
        FT_FRAME_ULONG_LE( format ),
        FT_FRAME_ULONG_LE( size ),   /* rounded up to a multiple of 4 */
        FT_FRAME_ULONG_LE( offset ),
      FT_FRAME_END
    };
  
  
    static FT_Error
    pcf_read_TOC( FT_Stream  stream,
                  PCF_Face   face )
    {
      FT_Error   error;
      PCF_Toc    toc = &face->toc;
      PCF_Table  tables;
  
      FT_Memory  memory = FT_FACE( face )->memory;
      FT_UInt    n;
  
      FT_ULong   size;
  
  
      if ( FT_STREAM_SEEK( 0 )                          ||
           FT_STREAM_READ_FIELDS( pcf_toc_header, toc ) )
        return FT_THROW( Cannot_Open_Resource );
  
      if ( toc->version != PCF_FILE_VERSION ||
           toc->count   == 0                )
        return FT_THROW( Invalid_File_Format );
  
      if ( stream->size < 16 )
        return FT_THROW( Invalid_File_Format );
  
      /* we need 16 bytes per TOC entry */
      if ( toc->count > stream->size >> 4 )
      {
        FT_TRACE0(( "pcf_read_TOC: adjusting number of tables"
                    " (from %d to %d)\n",
                    toc->count, stream->size >> 4 ));
        toc->count = stream->size >> 4;
      }
  
      if ( FT_NEW_ARRAY( face->toc.tables, toc->count ) )
        return FT_THROW( Out_Of_Memory );
  
      tables = face->toc.tables;
      for ( n = 0; n < toc->count; n++ )
      {
        if ( FT_STREAM_READ_FIELDS( pcf_table_header, tables ) )
          goto Exit;
        tables++;
      }
  
      /* Sort tables and check for overlaps.  Because they are almost      */
      /* always ordered already, an in-place bubble sort with simultaneous */
      /* boundary checking seems appropriate.                              */
      tables = face->toc.tables;
  
      for ( n = 0; n < toc->count - 1; n++ )
      {
        FT_UInt  i, have_change;
  
  
        have_change = 0;
  
        for ( i = 0; i < toc->count - 1 - n; i++ )
        {
          PCF_TableRec  tmp;
  
  
          if ( tables[i].offset > tables[i + 1].offset )
          {
            tmp           = tables[i];
            tables[i]     = tables[i + 1];
            tables[i + 1] = tmp;
  
            have_change = 1;
          }
  
          if ( ( tables[i].size   > tables[i + 1].offset )                  ||
               ( tables[i].offset > tables[i + 1].offset - tables[i].size ) )
          {
            error = FT_THROW( Invalid_Offset );
            goto Exit;
          }
        }
  
        if ( !have_change )
          break;
      }
  
      /*
       *  We now check whether the `size' and `offset' values are reasonable:
       *  `offset' + `size' must not exceed the stream size.
       *
       *  Note, however, that X11's `pcfWriteFont' routine (used by the
       *  `bdftopcf' program to create PDF font files) has two special
       *  features.
       *
       *  - It always assigns the accelerator table a size of 100 bytes in the
       *    TOC, regardless of its real size, which can vary between 34 and 72
       *    bytes.
       *
       *  - Due to the way the routine is designed, it ships out the last font
       *    table with its real size, ignoring the TOC's size value.  Since
       *    the TOC size values are always rounded up to a multiple of 4, the
       *    difference can be up to three bytes for all tables except the
       *    accelerator table, for which the difference can be as large as 66
       *    bytes.
       *
       */
  
      tables = face->toc.tables;
      size   = stream->size;
  
      for ( n = 0; n < toc->count - 1; n++ )
      {
        /* we need two checks to avoid overflow */
        if ( ( tables->size   > size                ) ||
             ( tables->offset > size - tables->size ) )
        {
          error = FT_THROW( Invalid_Table );
          goto Exit;
        }
        tables++;
      }
  
      /* only check `tables->offset' for last table element ... */
      if ( ( tables->offset > size ) )
      {
        error = FT_THROW( Invalid_Table );
        goto Exit;
      }
      /* ... and adjust `tables->size' to the real value if necessary */
      if ( tables->size > size - tables->offset )
        tables->size = size - tables->offset;
  
  #ifdef FT_DEBUG_LEVEL_TRACE
  
      {
        FT_UInt      i, j;
        const char*  name = "?";
  
  
        FT_TRACE4(( "pcf_read_TOC:\n" ));
  
        FT_TRACE4(( "  number of tables: %ld\n", face->toc.count ));
  
        tables = face->toc.tables;
        for ( i = 0; i < toc->count; i++ )
        {
          for ( j = 0; j < sizeof ( tableNames ) / sizeof ( tableNames[0] );
                j++ )
            if ( tables[i].type == (FT_UInt)( 1 << j ) )
              name = tableNames[j];
  
          FT_TRACE4(( "  %d: type=%s, format=0x%X, "
                      "size=%ld (0x%lX), offset=%ld (0x%lX)\n",
                      i, name,
                      tables[i].format,
                      tables[i].size, tables[i].size,
                      tables[i].offset, tables[i].offset ));
        }
      }
  
  #endif
  
      return FT_Err_Ok;
  
    Exit:
      FT_FREE( face->toc.tables );
      return error;
    }
  
  
  #define PCF_METRIC_SIZE  12
  
    static
    const FT_Frame_Field  pcf_metric_header[] =
    {
  #undef  FT_STRUCTURE
  #define FT_STRUCTURE  PCF_MetricRec
  
      FT_FRAME_START( PCF_METRIC_SIZE ),
        FT_FRAME_SHORT_LE( leftSideBearing ),
        FT_FRAME_SHORT_LE( rightSideBearing ),
        FT_FRAME_SHORT_LE( characterWidth ),
        FT_FRAME_SHORT_LE( ascent ),
        FT_FRAME_SHORT_LE( descent ),
        FT_FRAME_SHORT_LE( attributes ),
      FT_FRAME_END
    };
  
  
    static
    const FT_Frame_Field  pcf_metric_msb_header[] =
    {
  #undef  FT_STRUCTURE
  #define FT_STRUCTURE  PCF_MetricRec
  
      FT_FRAME_START( PCF_METRIC_SIZE ),
        FT_FRAME_SHORT( leftSideBearing ),
        FT_FRAME_SHORT( rightSideBearing ),
        FT_FRAME_SHORT( characterWidth ),
        FT_FRAME_SHORT( ascent ),
        FT_FRAME_SHORT( descent ),
        FT_FRAME_SHORT( attributes ),
      FT_FRAME_END
    };
  
  
  #define PCF_COMPRESSED_METRIC_SIZE  5
  
    static
    const FT_Frame_Field  pcf_compressed_metric_header[] =
    {
  #undef  FT_STRUCTURE
  #define FT_STRUCTURE  PCF_Compressed_MetricRec
  
      FT_FRAME_START( PCF_COMPRESSED_METRIC_SIZE ),
        FT_FRAME_BYTE( leftSideBearing ),
        FT_FRAME_BYTE( rightSideBearing ),
        FT_FRAME_BYTE( characterWidth ),
        FT_FRAME_BYTE( ascent ),
        FT_FRAME_BYTE( descent ),
      FT_FRAME_END
    };
  
  
    static FT_Error
    pcf_get_metric( FT_Stream   stream,
                    FT_ULong    format,
                    PCF_Metric  metric )
    {
      FT_Error  error = FT_Err_Ok;
  
  
      if ( PCF_FORMAT_MATCH( format, PCF_DEFAULT_FORMAT ) )
      {
        const FT_Frame_Field*  fields;
  
  
        /* parsing normal metrics */
        fields = PCF_BYTE_ORDER( format ) == MSBFirst
                 ? pcf_metric_msb_header
                 : pcf_metric_header;
  
        /* the following sets `error' but doesn't return in case of failure */
        (void)FT_STREAM_READ_FIELDS( fields, metric );
      }
      else
      {
        PCF_Compressed_MetricRec  compr;
  
  
        /* parsing compressed metrics */
        if ( FT_STREAM_READ_FIELDS( pcf_compressed_metric_header, &compr ) )
          goto Exit;
  
        metric->leftSideBearing  = (FT_Short)( compr.leftSideBearing  - 0x80 );
        metric->rightSideBearing = (FT_Short)( compr.rightSideBearing - 0x80 );
        metric->characterWidth   = (FT_Short)( compr.characterWidth   - 0x80 );
        metric->ascent           = (FT_Short)( compr.ascent           - 0x80 );
        metric->descent          = (FT_Short)( compr.descent          - 0x80 );
        metric->attributes       = 0;
      }
  
    Exit:
      return error;
    }
  
  
    static FT_Error
    pcf_seek_to_table_type( FT_Stream  stream,
                            PCF_Table  tables,
                            FT_ULong   ntables, /* same as PCF_Toc->count */
                            FT_ULong   type,
                            FT_ULong  *aformat,
                            FT_ULong  *asize )
    {
      FT_Error  error = FT_ERR( Invalid_File_Format );
      FT_ULong  i;
  
  
      for ( i = 0; i < ntables; i++ )
        if ( tables[i].type == type )
        {
          if ( stream->pos > tables[i].offset )
          {
            error = FT_THROW( Invalid_Stream_Skip );
            goto Fail;
          }
  
          if ( FT_STREAM_SKIP( tables[i].offset - stream->pos ) )
          {
            error = FT_THROW( Invalid_Stream_Skip );
            goto Fail;
          }
  
          *asize   = tables[i].size;
          *aformat = tables[i].format;
  
          return FT_Err_Ok;
        }
  
    Fail:
      *asize = 0;
      return error;
    }
  
  
    static FT_Bool
    pcf_has_table_type( PCF_Table  tables,
                        FT_ULong   ntables, /* same as PCF_Toc->count */
                        FT_ULong   type )
    {
      FT_ULong  i;
  
  
      for ( i = 0; i < ntables; i++ )
        if ( tables[i].type == type )
          return TRUE;
  
      return FALSE;
    }
  
  
  #define PCF_PROPERTY_SIZE  9
  
    static
    const FT_Frame_Field  pcf_property_header[] =
    {
  #undef  FT_STRUCTURE
  #define FT_STRUCTURE  PCF_ParsePropertyRec
  
      FT_FRAME_START( PCF_PROPERTY_SIZE ),
        FT_FRAME_LONG_LE( name ),
        FT_FRAME_BYTE   ( isString ),
        FT_FRAME_LONG_LE( value ),
      FT_FRAME_END
    };
  
  
    static
    const FT_Frame_Field  pcf_property_msb_header[] =
    {
  #undef  FT_STRUCTURE
  #define FT_STRUCTURE  PCF_ParsePropertyRec
  
      FT_FRAME_START( PCF_PROPERTY_SIZE ),
        FT_FRAME_LONG( name ),
        FT_FRAME_BYTE( isString ),
        FT_FRAME_LONG( value ),
      FT_FRAME_END
    };
  
  
    FT_LOCAL_DEF( PCF_Property )
    pcf_find_property( PCF_Face          face,
                       const FT_String*  prop )
    {
      PCF_Property  properties = face->properties;
      FT_Bool       found      = 0;
      int           i;
  
  
      for ( i = 0; i < face->nprops && !found; i++ )
      {
        if ( !ft_strcmp( properties[i].name, prop ) )
          found = 1;
      }
  
      if ( found )
        return properties + i - 1;
      else
        return NULL;
    }
  
  
    static FT_Error
    pcf_get_properties( FT_Stream  stream,
                        PCF_Face   face )
    {
      PCF_ParseProperty  props      = NULL;
      PCF_Property       properties = NULL;
      FT_ULong           nprops, i;
      FT_ULong           format, size;
      FT_Error           error;
      FT_Memory          memory     = FT_FACE( face )->memory;
      FT_ULong           string_size;
      FT_String*         strings    = NULL;
  
  
      error = pcf_seek_to_table_type( stream,
                                      face->toc.tables,
                                      face->toc.count,
                                      PCF_PROPERTIES,
                                      &format,
                                      &size );
      if ( error )
        goto Bail;
  
      if ( FT_READ_ULONG_LE( format ) )
        goto Bail;
  
      FT_TRACE4(( "pcf_get_properties:\n" ));
  
      FT_TRACE4(( "  format = %ld\n", format ));
  
      if ( !PCF_FORMAT_MATCH( format, PCF_DEFAULT_FORMAT ) )
        goto Bail;
  
      if ( PCF_BYTE_ORDER( format ) == MSBFirst )
        (void)FT_READ_ULONG( nprops );
      else
        (void)FT_READ_ULONG_LE( nprops );
      if ( error )
        goto Bail;
  
      FT_TRACE4(( "  nprop = %d (truncate %d props)\n",
                  (int)nprops, nprops - (FT_ULong)(int)nprops ));
  
      nprops = (FT_ULong)(int)nprops;
  
      /* rough estimate */
      if ( nprops > size / PCF_PROPERTY_SIZE )
      {
        error = FT_THROW( Invalid_Table );
        goto Bail;
      }
  
      face->nprops = (int)nprops;
  
      if ( FT_NEW_ARRAY( props, nprops ) )
        goto Bail;
  
      for ( i = 0; i < nprops; i++ )
      {
        if ( PCF_BYTE_ORDER( format ) == MSBFirst )
        {
          if ( FT_STREAM_READ_FIELDS( pcf_property_msb_header, props + i ) )
            goto Bail;
        }
        else
        {
          if ( FT_STREAM_READ_FIELDS( pcf_property_header, props + i ) )
            goto Bail;
        }
      }
  
      /* pad the property array                                            */
      /*                                                                   */
      /* clever here - nprops is the same as the number of odd-units read, */
      /* as only isStringProp are odd length   (Keith Packard)             */
      /*                                                                   */
      if ( nprops & 3 )
      {
        i = 4 - ( nprops & 3 );
        if ( FT_STREAM_SKIP( i ) )
        {
          error = FT_THROW( Invalid_Stream_Skip );
          goto Bail;
        }
      }
  
      if ( PCF_BYTE_ORDER( format ) == MSBFirst )
        (void)FT_READ_ULONG( string_size );
      else
        (void)FT_READ_ULONG_LE( string_size );
      if ( error )
        goto Bail;
  
      FT_TRACE4(( "  string_size = %ld\n", string_size ));
  
      /* rough estimate */
      if ( string_size > size - nprops * PCF_PROPERTY_SIZE )
      {
        error = FT_THROW( Invalid_Table );
        goto Bail;
      }
  
      /* allocate one more byte so that we have a final null byte */
      if ( FT_NEW_ARRAY( strings, string_size + 1 ) )
        goto Bail;
  
      error = FT_Stream_Read( stream, (FT_Byte*)strings, string_size );
      if ( error )
        goto Bail;
  
      if ( FT_NEW_ARRAY( properties, nprops ) )
        goto Bail;
  
      face->properties = properties;
  
      for ( i = 0; i < nprops; i++ )
      {
        FT_Long  name_offset = props[i].name;
  
  
        if ( ( name_offset < 0 )                     ||
             ( (FT_ULong)name_offset > string_size ) )
        {
          error = FT_THROW( Invalid_Offset );
          goto Bail;
        }
  
        if ( FT_STRDUP( properties[i].name, strings + name_offset ) )
          goto Bail;
  
        FT_TRACE4(( "  %s:", properties[i].name ));
  
        properties[i].isString = props[i].isString;
  
        if ( props[i].isString )
        {
          FT_Long  value_offset = props[i].value;
  
  
          if ( ( value_offset < 0 )                     ||
               ( (FT_ULong)value_offset > string_size ) )
          {
            error = FT_THROW( Invalid_Offset );
            goto Bail;
          }
  
          if ( FT_STRDUP( properties[i].value.atom, strings + value_offset ) )
            goto Bail;
  
          FT_TRACE4(( " `%s'\n", properties[i].value.atom ));
        }
        else
        {
          properties[i].value.l = props[i].value;
  
          FT_TRACE4(( " %d\n", properties[i].value.l ));
        }
      }
  
      error = FT_Err_Ok;
  
    Bail:
      FT_FREE( props );
      FT_FREE( strings );
  
      return error;
    }
  
  
    static FT_Error
    pcf_get_metrics( FT_Stream  stream,
                     PCF_Face   face )
    {
      FT_Error    error;
      FT_Memory   memory  = FT_FACE( face )->memory;
      FT_ULong    format, size;
      PCF_Metric  metrics = NULL;
      FT_ULong    nmetrics, i;
  
  
      error = pcf_seek_to_table_type( stream,
                                      face->toc.tables,
                                      face->toc.count,
                                      PCF_METRICS,
                                      &format,
                                      &size );
      if ( error )
        return error;
  
      if ( FT_READ_ULONG_LE( format ) )
        goto Bail;
  
      if ( !PCF_FORMAT_MATCH( format, PCF_DEFAULT_FORMAT )     &&
           !PCF_FORMAT_MATCH( format, PCF_COMPRESSED_METRICS ) )
        return FT_THROW( Invalid_File_Format );
  
      if ( PCF_FORMAT_MATCH( format, PCF_DEFAULT_FORMAT ) )
      {
        if ( PCF_BYTE_ORDER( format ) == MSBFirst )
          (void)FT_READ_ULONG( nmetrics );
        else
          (void)FT_READ_ULONG_LE( nmetrics );
      }
      else
      {
        if ( PCF_BYTE_ORDER( format ) == MSBFirst )
          (void)FT_READ_USHORT( nmetrics );
        else
          (void)FT_READ_USHORT_LE( nmetrics );
      }
      if ( error )
        return FT_THROW( Invalid_File_Format );
  
      face->nmetrics = nmetrics;
  
      if ( !nmetrics )
        return FT_THROW( Invalid_Table );
  
      FT_TRACE4(( "pcf_get_metrics:\n" ));
  
      FT_TRACE4(( "  number of metrics: %d\n", nmetrics ));
  
      /* rough estimate */
      if ( PCF_FORMAT_MATCH( format, PCF_DEFAULT_FORMAT ) )
      {
        if ( nmetrics > size / PCF_METRIC_SIZE )
          return FT_THROW( Invalid_Table );
      }
      else
      {
        if ( nmetrics > size / PCF_COMPRESSED_METRIC_SIZE )
          return FT_THROW( Invalid_Table );
      }
  
      if ( FT_NEW_ARRAY( face->metrics, nmetrics ) )
        return FT_THROW( Out_Of_Memory );
  
      metrics = face->metrics;
      for ( i = 0; i < nmetrics; i++, metrics++ )
      {
        error = pcf_get_metric( stream, format, metrics );
  
        metrics->bits = 0;
  
        FT_TRACE5(( "  idx %d: width=%d, "
                    "lsb=%d, rsb=%d, ascent=%d, descent=%d, swidth=%d\n",
                    i,
                    metrics->characterWidth,
                    metrics->leftSideBearing,
                    metrics->rightSideBearing,
                    metrics->ascent,
                    metrics->descent,
                    metrics->attributes ));
  
        if ( error )
          break;
  
        /* sanity checks -- those values are used in `PCF_Glyph_Load' to     */
        /* compute a glyph's bitmap dimensions, thus setting them to zero in */
        /* case of an error disables this particular glyph only              */
        if ( metrics->rightSideBearing < metrics->leftSideBearing ||
             metrics->ascent + metrics->descent < 0               )
        {
          metrics->characterWidth   = 0;
          metrics->leftSideBearing  = 0;
          metrics->rightSideBearing = 0;
          metrics->ascent           = 0;
          metrics->descent          = 0;
  
          FT_TRACE0(( "pcf_get_metrics:"
                      " invalid metrics for glyph %d\n", i ));
        }
      }
  
      if ( error )
        FT_FREE( face->metrics );
  
    Bail:
      return error;
    }
  
  
    static FT_Error
    pcf_get_bitmaps( FT_Stream  stream,
                     PCF_Face   face )
    {
      FT_Error   error;
      FT_Memory  memory  = FT_FACE( face )->memory;
      FT_Long*   offsets = NULL;
      FT_Long    bitmapSizes[GLYPHPADOPTIONS];
      FT_ULong   format, size;
      FT_ULong   nbitmaps, i, sizebitmaps = 0;
  
  
      error = pcf_seek_to_table_type( stream,
                                      face->toc.tables,
                                      face->toc.count,
                                      PCF_BITMAPS,
                                      &format,
                                      &size );
      if ( error )
        return error;
  
      error = FT_Stream_EnterFrame( stream, 8 );
      if ( error )
        return error;
  
      format = FT_GET_ULONG_LE();
      if ( PCF_BYTE_ORDER( format ) == MSBFirst )
        nbitmaps  = FT_GET_ULONG();
      else
        nbitmaps  = FT_GET_ULONG_LE();
  
      FT_Stream_ExitFrame( stream );
  
      if ( !PCF_FORMAT_MATCH( format, PCF_DEFAULT_FORMAT ) )
        return FT_THROW( Invalid_File_Format );
  
      FT_TRACE4(( "pcf_get_bitmaps:\n" ));
  
      FT_TRACE4(( "  number of bitmaps: %d\n", nbitmaps ));
  
      if ( nbitmaps != face->nmetrics )
        return FT_THROW( Invalid_File_Format );
  
      if ( FT_NEW_ARRAY( offsets, nbitmaps ) )
        return error;
  
      for ( i = 0; i < nbitmaps; i++ )
      {
        if ( PCF_BYTE_ORDER( format ) == MSBFirst )
          (void)FT_READ_LONG( offsets[i] );
        else
          (void)FT_READ_LONG_LE( offsets[i] );
  
        FT_TRACE5(( "  bitmap %d: offset %ld (0x%lX)\n",
                    i, offsets[i], offsets[i] ));
      }
      if ( error )
        goto Bail;
  
      for ( i = 0; i < GLYPHPADOPTIONS; i++ )
      {
        if ( PCF_BYTE_ORDER( format ) == MSBFirst )
          (void)FT_READ_LONG( bitmapSizes[i] );
        else
          (void)FT_READ_LONG_LE( bitmapSizes[i] );
        if ( error )
          goto Bail;
  
        sizebitmaps = (FT_ULong)bitmapSizes[PCF_GLYPH_PAD_INDEX( format )];
  
        FT_TRACE4(( "  padding %d implies a size of %ld\n",
                    i, bitmapSizes[i] ));
      }
  
      FT_TRACE4(( "  %d bitmaps, padding index %ld\n",
                  nbitmaps,
                  PCF_GLYPH_PAD_INDEX( format ) ));
      FT_TRACE4(( "  bitmap size = %d\n", sizebitmaps ));
  
      FT_UNUSED( sizebitmaps );       /* only used for debugging */
  
      for ( i = 0; i < nbitmaps; i++ )
      {
        /* rough estimate */
        if ( ( offsets[i] < 0 )              ||
             ( (FT_ULong)offsets[i] > size ) )
        {
          FT_TRACE0(( "pcf_get_bitmaps:"
                      " invalid offset to bitmap data of glyph %d\n", i ));
        }
        else
          face->metrics[i].bits = stream->pos + (FT_ULong)offsets[i];
      }
  
      face->bitmapsFormat = format;
  
    Bail:
      FT_FREE( offsets );
      return error;
    }
  
  
    static FT_Error
    pcf_get_encodings( FT_Stream  stream,
                       PCF_Face   face )
    {
      FT_Error      error;
      FT_Memory     memory = FT_FACE( face )->memory;
      FT_ULong      format, size;
      int           firstCol, lastCol;
      int           firstRow, lastRow;
      FT_ULong      nencoding;
      FT_UShort     encodingOffset;
      int           i, j;
      FT_ULong      k;
      PCF_Encoding  encoding = NULL;
  
  
      error = pcf_seek_to_table_type( stream,
                                      face->toc.tables,
                                      face->toc.count,
                                      PCF_BDF_ENCODINGS,
                                      &format,
                                      &size );
      if ( error )
        return error;
  
      error = FT_Stream_EnterFrame( stream, 14 );
      if ( error )
        return error;
  
      format = FT_GET_ULONG_LE();
  
      if ( PCF_BYTE_ORDER( format ) == MSBFirst )
      {
        firstCol          = FT_GET_SHORT();
        lastCol           = FT_GET_SHORT();
        firstRow          = FT_GET_SHORT();
        lastRow           = FT_GET_SHORT();
        face->defaultChar = FT_GET_SHORT();
      }
      else
      {
        firstCol          = FT_GET_SHORT_LE();
        lastCol           = FT_GET_SHORT_LE();
        firstRow          = FT_GET_SHORT_LE();
        lastRow           = FT_GET_SHORT_LE();
        face->defaultChar = FT_GET_SHORT_LE();
      }
  
      FT_Stream_ExitFrame( stream );
  
      if ( !PCF_FORMAT_MATCH( format, PCF_DEFAULT_FORMAT ) )
        return FT_THROW( Invalid_File_Format );
  
      /* sanity checks */
      if ( firstCol < 0       ||
           firstCol > lastCol ||
           lastCol  > 0xFF    ||
           firstRow < 0       ||
           firstRow > lastRow ||
           lastRow  > 0xFF    )
        return FT_THROW( Invalid_Table );
  
      FT_TRACE4(( "pdf_get_encodings:\n" ));
  
      FT_TRACE4(( "  firstCol %d, lastCol %d, firstRow %d, lastRow %d\n",
                  firstCol, lastCol, firstRow, lastRow ));
  
      nencoding = (FT_ULong)( lastCol - firstCol + 1 ) *
                  (FT_ULong)( lastRow - firstRow + 1 );
  
      if ( FT_NEW_ARRAY( encoding, nencoding ) )
        return FT_THROW( Out_Of_Memory );
  
      error = FT_Stream_EnterFrame( stream, 2 * nencoding );
      if ( error )
        goto Bail;
  
      k = 0;
      for ( i = firstRow; i <= lastRow; i++ )
      {
        for ( j = firstCol; j <= lastCol; j++ )
        {
          /* X11's reference implementation uses the equivalent to  */
          /* `FT_GET_SHORT', however PCF fonts with more than 32768 */
          /* characters (e.g. `unifont.pcf') clearly show that an   */
          /* unsigned value is needed.                              */
          if ( PCF_BYTE_ORDER( format ) == MSBFirst )
            encodingOffset = FT_GET_USHORT();
          else
            encodingOffset = FT_GET_USHORT_LE();
  
          if ( encodingOffset != 0xFFFFU )
          {
            encoding[k].enc   = i * 256 + j;
            encoding[k].glyph = encodingOffset;
  
            FT_TRACE5(( "  code %d (0x%04X): idx %d\n",
                        encoding[k].enc, encoding[k].enc, encoding[k].glyph ));
  
            k++;
          }
        }
      }
      FT_Stream_ExitFrame( stream );
  
      if ( FT_RENEW_ARRAY( encoding, nencoding, k ) )
        goto Bail;
  
      face->nencodings = k;
      face->encodings  = encoding;
  
      return error;
  
    Bail:
      FT_FREE( encoding );
      return error;
    }
  
  
    static
    const FT_Frame_Field  pcf_accel_header[] =
    {
  #undef  FT_STRUCTURE
  #define FT_STRUCTURE  PCF_AccelRec
  
      FT_FRAME_START( 20 ),
        FT_FRAME_BYTE      ( noOverlap ),
        FT_FRAME_BYTE      ( constantMetrics ),
        FT_FRAME_BYTE      ( terminalFont ),
        FT_FRAME_BYTE      ( constantWidth ),
        FT_FRAME_BYTE      ( inkInside ),
        FT_FRAME_BYTE      ( inkMetrics ),
        FT_FRAME_BYTE      ( drawDirection ),
        FT_FRAME_SKIP_BYTES( 1 ),
        FT_FRAME_LONG_LE   ( fontAscent ),
        FT_FRAME_LONG_LE   ( fontDescent ),
        FT_FRAME_LONG_LE   ( maxOverlap ),
      FT_FRAME_END
    };
  
  
    static
    const FT_Frame_Field  pcf_accel_msb_header[] =
    {
  #undef  FT_STRUCTURE
  #define FT_STRUCTURE  PCF_AccelRec
  
      FT_FRAME_START( 20 ),
        FT_FRAME_BYTE      ( noOverlap ),
        FT_FRAME_BYTE      ( constantMetrics ),
        FT_FRAME_BYTE      ( terminalFont ),
        FT_FRAME_BYTE      ( constantWidth ),
        FT_FRAME_BYTE      ( inkInside ),
        FT_FRAME_BYTE      ( inkMetrics ),
        FT_FRAME_BYTE      ( drawDirection ),
        FT_FRAME_SKIP_BYTES( 1 ),
        FT_FRAME_LONG      ( fontAscent ),
        FT_FRAME_LONG      ( fontDescent ),
        FT_FRAME_LONG      ( maxOverlap ),
      FT_FRAME_END
    };
  
  
    static FT_Error
    pcf_get_accel( FT_Stream  stream,
                   PCF_Face   face,
                   FT_ULong   type )
    {
      FT_ULong   format, size;
      FT_Error   error;
      PCF_Accel  accel = &face->accel;
  
  
      error = pcf_seek_to_table_type( stream,
                                      face->toc.tables,
                                      face->toc.count,
                                      type,
                                      &format,
                                      &size );
      if ( error )
        goto Bail;
  
      if ( FT_READ_ULONG_LE( format ) )
        goto Bail;
  
      if ( !PCF_FORMAT_MATCH( format, PCF_DEFAULT_FORMAT )    &&
           !PCF_FORMAT_MATCH( format, PCF_ACCEL_W_INKBOUNDS ) )
        goto Bail;
  
      if ( PCF_BYTE_ORDER( format ) == MSBFirst )
      {
        if ( FT_STREAM_READ_FIELDS( pcf_accel_msb_header, accel ) )
          goto Bail;
      }
      else
      {
        if ( FT_STREAM_READ_FIELDS( pcf_accel_header, accel ) )
          goto Bail;
      }
  
      error = pcf_get_metric( stream,
                              format & ( ~PCF_FORMAT_MASK ),
                              &(accel->minbounds) );
      if ( error )
        goto Bail;
  
      error = pcf_get_metric( stream,
                              format & ( ~PCF_FORMAT_MASK ),
                              &(accel->maxbounds) );
      if ( error )
        goto Bail;
  
      if ( PCF_FORMAT_MATCH( format, PCF_ACCEL_W_INKBOUNDS ) )
      {
        error = pcf_get_metric( stream,
                                format & ( ~PCF_FORMAT_MASK ),
                                &(accel->ink_minbounds) );
        if ( error )
          goto Bail;
  
        error = pcf_get_metric( stream,
                                format & ( ~PCF_FORMAT_MASK ),
                                &(accel->ink_maxbounds) );
        if ( error )
          goto Bail;
      }
      else
      {
        accel->ink_minbounds = accel->minbounds; /* I'm not sure about this */
        accel->ink_maxbounds = accel->maxbounds;
      }
  
    Bail:
      return error;
    }
  
  
    static FT_Error
    pcf_interpret_style( PCF_Face  pcf )
    {
      FT_Error   error  = FT_Err_Ok;
      FT_Face    face   = FT_FACE( pcf );
      FT_Memory  memory = face->memory;
  
      PCF_Property  prop;
  
      size_t  nn, len;
      char*   strings[4] = { NULL, NULL, NULL, NULL };
      size_t  lengths[4];
  
  
      face->style_flags = 0;
  
      prop = pcf_find_property( pcf, "SLANT" );
      if ( prop && prop->isString                                       &&
           ( *(prop->value.atom) == 'O' || *(prop->value.atom) == 'o' ||
             *(prop->value.atom) == 'I' || *(prop->value.atom) == 'i' ) )
      {
        face->style_flags |= FT_STYLE_FLAG_ITALIC;
        strings[2] = ( *(prop->value.atom) == 'O' ||
                       *(prop->value.atom) == 'o' ) ? (char *)"Oblique"
                                                    : (char *)"Italic";
      }
  
      prop = pcf_find_property( pcf, "WEIGHT_NAME" );
      if ( prop && prop->isString                                       &&
           ( *(prop->value.atom) == 'B' || *(prop->value.atom) == 'b' ) )
      {
        face->style_flags |= FT_STYLE_FLAG_BOLD;
        strings[1] = (char*)"Bold";
      }
  
      prop = pcf_find_property( pcf, "SETWIDTH_NAME" );
      if ( prop && prop->isString                                        &&
           *(prop->value.atom)                                           &&
           !( *(prop->value.atom) == 'N' || *(prop->value.atom) == 'n' ) )
        strings[3] = (char*)( prop->value.atom );
  
      prop = pcf_find_property( pcf, "ADD_STYLE_NAME" );
      if ( prop && prop->isString                                        &&
           *(prop->value.atom)                                           &&
           !( *(prop->value.atom) == 'N' || *(prop->value.atom) == 'n' ) )
        strings[0] = (char*)( prop->value.atom );
  
      for ( len = 0, nn = 0; nn < 4; nn++ )
      {
        lengths[nn] = 0;
        if ( strings[nn] )
        {
          lengths[nn] = ft_strlen( strings[nn] );
          len        += lengths[nn] + 1;
        }
      }
  
      if ( len == 0 )
      {
        strings[0] = (char*)"Regular";
        lengths[0] = ft_strlen( strings[0] );
        len        = lengths[0] + 1;
      }
  
      {
        char*  s;
  
  
        if ( FT_ALLOC( face->style_name, len ) )
          return error;
  
        s = face->style_name;
  
        for ( nn = 0; nn < 4; nn++ )
        {
          char*  src = strings[nn];
  
  
          len = lengths[nn];
  
          if ( src == NULL )
            continue;
  
          /* separate elements with a space */
          if ( s != face->style_name )
            *s++ = ' ';
  
          ft_memcpy( s, src, len );
  
          /* need to convert spaces to dashes for */
          /* add_style_name and setwidth_name     */
          if ( nn == 0 || nn == 3 )
          {
            size_t  mm;
  
  
            for ( mm = 0; mm < len; mm++ )
              if ( s[mm] == ' ' )
                s[mm] = '-';
          }
  
          s += len;
        }
        *s = 0;
      }
  
      return error;
    }
  
  
    FT_LOCAL_DEF( FT_Error )
    pcf_load_font( FT_Stream  stream,
                   PCF_Face   face,
                   FT_Long    face_index )
    {
      FT_Face    root   = FT_FACE( face );
      FT_Error   error;
      FT_Memory  memory = FT_FACE( face )->memory;
      FT_Bool    hasBDFAccelerators;
  
  
      error = pcf_read_TOC( stream, face );
      if ( error )
        goto Exit;
  
      root->num_faces  = 1;
      root->face_index = 0;
  
      /* If we are performing a simple font format check, exit immediately. */
      if ( face_index < 0 )
        return FT_Err_Ok;
  
      error = pcf_get_properties( stream, face );
      if ( error )
        goto Exit;
  
      /* Use the old accelerators if no BDF accelerators are in the file. */
      hasBDFAccelerators = pcf_has_table_type( face->toc.tables,
                                               face->toc.count,
                                               PCF_BDF_ACCELERATORS );
      if ( !hasBDFAccelerators )
      {
        error = pcf_get_accel( stream, face, PCF_ACCELERATORS );
        if ( error )
          goto Exit;
      }
  
      /* metrics */
      error = pcf_get_metrics( stream, face );
      if ( error )
        goto Exit;
  
      /* bitmaps */
      error = pcf_get_bitmaps( stream, face );
      if ( error )
        goto Exit;
  
      /* encodings */
      error = pcf_get_encodings( stream, face );
      if ( error )
        goto Exit;
  
      /* BDF style accelerators (i.e. bounds based on encoded glyphs) */
      if ( hasBDFAccelerators )
      {
        error = pcf_get_accel( stream, face, PCF_BDF_ACCELERATORS );
        if ( error )
          goto Exit;
      }
  
      /* XXX: TO DO: inkmetrics and glyph_names are missing */
  
      /* now construct the face object */
      {
        PCF_Property  prop;
  
  
        root->face_flags |= FT_FACE_FLAG_FIXED_SIZES |
                            FT_FACE_FLAG_HORIZONTAL  |
                            FT_FACE_FLAG_FAST_GLYPHS;
  
        if ( face->accel.constantWidth )
          root->face_flags |= FT_FACE_FLAG_FIXED_WIDTH;
  
        if ( ( error = pcf_interpret_style( face ) ) != 0 )
           goto Exit;
  
        prop = pcf_find_property( face, "FAMILY_NAME" );
        if ( prop && prop->isString )
        {
          if ( FT_STRDUP( root->family_name, prop->value.atom ) )
            goto Exit;
        }
        else
          root->family_name = NULL;
  
        /*
         * Note: We shift all glyph indices by +1 since we must
         * respect the convention that glyph 0 always corresponds
         * to the `missing glyph'.
         *
         * This implies bumping the number of `available' glyphs by 1.
         */
        root->num_glyphs = (FT_Long)( face->nmetrics + 1 );
  
        root->num_fixed_sizes = 1;
        if ( FT_NEW_ARRAY( root->available_sizes, 1 ) )
          goto Exit;
  
        {
          FT_Bitmap_Size*  bsize = root->available_sizes;
          FT_Short         resolution_x = 0, resolution_y = 0;
  
  
          FT_MEM_ZERO( bsize, sizeof ( FT_Bitmap_Size ) );
  
          /* for simplicity, we take absolute values of integer properties */
  
  #if 0
          bsize->height = face->accel.maxbounds.ascent << 6;
  #endif
  
  #ifdef FT_DEBUG_LEVEL_TRACE
          if ( face->accel.fontAscent + face->accel.fontDescent < 0 )
            FT_TRACE0(( "pcf_load_font: negative height\n" ));
  #endif
          bsize->height = FT_ABS( (FT_Short)( face->accel.fontAscent +
                                              face->accel.fontDescent ) );
  
          prop = pcf_find_property( face, "AVERAGE_WIDTH" );
          if ( prop )
          {
  #ifdef FT_DEBUG_LEVEL_TRACE
            if ( prop->value.l < 0 )
              FT_TRACE0(( "pcf_load_font: negative average width\n" ));
  #endif
            bsize->width = FT_ABS( (FT_Short)( ( prop->value.l ) + 5 ) / 10 );
          }
          else
            bsize->width = (FT_Short)FT_MulDiv( bsize->height, 2, 3 );
  
          prop = pcf_find_property( face, "POINT_SIZE" );
          if ( prop )
          {
  #ifdef FT_DEBUG_LEVEL_TRACE
            if ( prop->value.l < 0 )
              FT_TRACE0(( "pcf_load_font: negative point size\n" ));
  #endif
            /* convert from 722.7 decipoints to 72 points per inch */
            bsize->size = FT_MulDiv( FT_ABS( prop->value.l ),
                                     64 * 7200,
                                     72270L );
          }
  
          prop = pcf_find_property( face, "PIXEL_SIZE" );
          if ( prop )
          {
  #ifdef FT_DEBUG_LEVEL_TRACE
            if ( prop->value.l < 0 )
              FT_TRACE0(( "pcf_load_font: negative pixel size\n" ));
  #endif
            bsize->y_ppem = FT_ABS( (FT_Short)prop->value.l ) << 6;
          }
  
          prop = pcf_find_property( face, "RESOLUTION_X" );
          if ( prop )
          {
  #ifdef FT_DEBUG_LEVEL_TRACE
            if ( prop->value.l < 0 )
              FT_TRACE0(( "pcf_load_font: negative X resolution\n" ));
  #endif
            resolution_x = FT_ABS( (FT_Short)prop->value.l );
          }
  
          prop = pcf_find_property( face, "RESOLUTION_Y" );
          if ( prop )
          {
  #ifdef FT_DEBUG_LEVEL_TRACE
            if ( prop->value.l < 0 )
              FT_TRACE0(( "pcf_load_font: negative Y resolution\n" ));
  #endif
            resolution_y = FT_ABS( (FT_Short)prop->value.l );
          }
  
          if ( bsize->y_ppem == 0 )
          {
            bsize->y_ppem = bsize->size;
            if ( resolution_y )
              bsize->y_ppem = FT_MulDiv( bsize->y_ppem, resolution_y, 72 );
          }
          if ( resolution_x && resolution_y )
            bsize->x_ppem = FT_MulDiv( bsize->y_ppem,
                                       resolution_x,
                                       resolution_y );
          else
            bsize->x_ppem = bsize->y_ppem;
        }
  
        /* set up charset */
        {
          PCF_Property  charset_registry, charset_encoding;
  
  
          charset_registry = pcf_find_property( face, "CHARSET_REGISTRY" );
          charset_encoding = pcf_find_property( face, "CHARSET_ENCODING" );
  
          if ( charset_registry && charset_registry->isString &&
               charset_encoding && charset_encoding->isString )
          {
            if ( FT_STRDUP( face->charset_encoding,
                            charset_encoding->value.atom ) ||
                 FT_STRDUP( face->charset_registry,
                            charset_registry->value.atom ) )
              goto Exit;
          }
        }
      }
  
    Exit:
      if ( error )
      {
        /* This is done to respect the behaviour of the original */
        /* PCF font driver.                                      */
        error = FT_THROW( Invalid_File_Format );
      }
  
      return error;
    }
  
  
  /* END */
  

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