kc3-lang/harfbuzz/src/hb-old/harfbuzz-stream.c

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• Author : Behdad Esfahbod
  Date : 2012-07-24 19:16:56
  Hash : 1512a735
  Message : [hb-old] Start adding HarfBuzz-old as a new backend

• src/hb-old/harfbuzz-stream.c

• /*
   * Copyright (C) 2005  David Turner
   * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
   * Copyright (C) 2007  Red Hat, Inc.
   *
   * This is part of HarfBuzz, an OpenType Layout engine library.
   *
   * Permission is hereby granted, without written agreement and without
   * license or royalty fees, to use, copy, modify, and distribute this
   * software and its documentation for any purpose, provided that the
   * above copyright notice and the following two paragraphs appear in
   * all copies of this software.
   *
   * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
   * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
   * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
   * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
   * DAMAGE.
   *
   * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
   * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
   * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
   * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
   * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
   *
   * Red Hat Author(s): Behdad Esfahbod
   */
  
  #include "harfbuzz-impl.h"
  #include "harfbuzz-stream-private.h"
  #include <stdlib.h>
  
  #if 0
  #include <stdio.h>
  #define  LOG(x)  _hb_log x
  
  static void
  _hb_log( const char*   format, ... )
  {
    va_list  ap;
   
    va_start( ap, format );
    vfprintf( stderr, format, ap );
    va_end( ap );
  }
  
  #else
  #define  LOG(x)  do {} while (0)
  #endif
  
  HB_INTERNAL void
  _hb_close_stream( HB_Stream stream )
  {
    if (!stream)
        return;
    free(stream->base);
    free(stream);
  }
  
  
  HB_INTERNAL HB_Int
  _hb_stream_pos( HB_Stream stream )
  {
    LOG(( "_hb_stream_pos() -> %ld\n", stream->pos ));
    return stream->pos;
  }
  
  
  HB_INTERNAL HB_Error
  _hb_stream_seek( HB_Stream stream,
  		 HB_UInt pos )
  {
    HB_Error  error = (HB_Error)0;
  
    stream->pos = pos;
    if (pos > stream->size)
        error = ERR(HB_Err_Read_Error);
  
    LOG(( "_hb_stream_seek(%ld) -> 0x%04X\n", pos, error ));
    return error;
  }
  
  
  HB_INTERNAL HB_Error
  _hb_stream_frame_enter( HB_Stream stream,
  			HB_UInt count )
  {
    HB_Error  error = HB_Err_Ok;
  
    /* check new position, watch for overflow */
    if (HB_UNLIKELY (stream->pos + count > stream->size ||
  		   stream->pos + count < stream->pos))
    {
      error = ERR(HB_Err_Read_Error);
      goto Exit;
    }
  
    /* set cursor */
    stream->cursor = stream->base + stream->pos;
    stream->pos   += count;
  
  Exit:
    LOG(( "_hb_stream_frame_enter(%ld) -> 0x%04X\n", count, error ));
    return error;
  }
  
  
  HB_INTERNAL void
  _hb_stream_frame_exit( HB_Stream stream )
  {
    stream->cursor = NULL;
  
    LOG(( "_hb_stream_frame_exit()\n" ));
  }