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