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98 lines
3.4 KiB
C
98 lines
3.4 KiB
C
/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with these librararies and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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/* $XConsortium: iljpgutil.c /main/3 1995/10/23 15:57:43 rswiston $ */
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/**---------------------------------------------------------------------
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***
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*** (c)Copyright 1992 Hewlett-Packard Co.
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***
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*** RESTRICTED RIGHTS LEGEND
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*** Use, duplication, or disclosure by the U.S. Government is subject to
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*** restrictions as set forth in sub-paragraph (c)(1)(ii) of the Rights in
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*** Technical Data and Computer Software clause in DFARS 252.227-7013.
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*** Hewlett-Packard Company
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*** 3000 Hanover Street
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*** Palo Alto, CA 94304 U.S.A.
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*** Rights for non-DOD U.S. Government Departments and Agencies are as set
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*** forth in FAR 52.227-19(c)(1,2).
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***
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***-------------------------------------------------------------------*/
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#include "iljpgint.h"
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/* JPEG zigzag scanning order */
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ILJPG_PRIVATE
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int _iljpgZigzagTable[64] = {
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0, 1, 5, 6,14,15,27,28,
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2, 4, 7,13,16,26,29,42,
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3, 8,12,17,25,30,41,43,
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9,11,18,24,31,40,44,53,
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10,19,23,32,39,45,52,54,
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20,22,33,38,46,51,55,60,
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21,34,37,47,50,56,59,61,
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35,36,48,49,57,58,62,63
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};
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/* -------------------- _iljpgValidPars -------------------------- */
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/* Validate the given parameter block and return true iff valid.
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*/
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ILJPG_PRIVATE
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iljpgBool _iljpgValidPars (
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register iljpgDataPtr pData
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)
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{
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int comp;
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iljpgCompDataPtr pCompData;
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register unsigned int index;
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#define VALID_FACTOR(_f) ( ((_f) == 1) || ((_f) == 2) || ((_f) == 4) )
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/* Validate *pData: valid hori/vertFactor, tables present, etc. */
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if ((pData->nComps <= 0)
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|| (pData->nComps > ILJPG_MAX_COMPS)
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|| (pData->nComps > ILJPG_MAX_COMPS)
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|| !VALID_FACTOR (pData->maxHoriFactor)
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|| !VALID_FACTOR (pData->maxVertFactor)
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|| (pData->width <= 0)
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|| (pData->height <= 0))
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return FALSE;
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for (comp = 0, pCompData = pData->comp; comp < pData->nComps; comp++, pCompData++) {
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if (!VALID_FACTOR (pCompData->horiFactor)
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|| !VALID_FACTOR (pCompData->vertFactor))
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return FALSE;
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index = (unsigned int)pCompData->QTableIndex;
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if ((index > 3) || !pData->QTables[index])
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return FALSE;
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index = (unsigned int)pCompData->DCTableIndex;
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if ((index > 3) || !pData->DCTables[index])
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return FALSE;
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index = (unsigned int)pCompData->ACTableIndex;
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if ((index > 3) || !pData->ACTables[index])
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return FALSE;
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}
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return TRUE;
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}
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