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webengine/wmlengine/src/script/src/scr_opcodes.c
author andy simpson <andrews@symbian.org>
Fri, 08 Jan 2010 16:24:11 +0000
changeset 24 745be455a3ad
parent 0 dd21522fd290
permissions -rw-r--r--
Added tag PDK_3.0.e for changeset ce710749a55f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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/*
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* Copyright (c) 1999 - 2001 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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*
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*/
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 /* 













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   $Workfile: scr_opcodes.c $













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    Purpose:













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      Inline parameters have been used to optimally pack information into as













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      few bytes as possible.  Therefore the opcodes types are:













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      1XXPPPPP  ==> type0













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      010XPPPP  ==> type1













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      011XXPPP  ==> type2













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      00XXXXXX  ==> type3













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      This file parses the opcode and return its type and any parameters/instrunctions













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      that has been packed with it.













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 */













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#include "scr_defs.h"













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void parse_opcode(NW_Byte *opcode, NW_Byte *param)













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{













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  /* 1XXPPPP */













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  if ((*opcode & 0x80) == 0x80) {













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    *param  = (NW_Byte)(*opcode & 0x1F);













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    *opcode = (NW_Byte)(*opcode & 0xE0);













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  }













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  /* 010XPPPP */













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  else if ((*opcode & 0xE0) == 0x40) {













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    *param  = (NW_Byte)(*opcode & 0x0F);













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    *opcode = (NW_Byte)(*opcode & 0xF0);













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  }













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  /* 011XXPPP */













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  else if ((*opcode & 0xE0) == 0x60 ) {













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    *param  = (NW_Byte)(*opcode & 0x07);













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    *opcode = (NW_Byte)(*opcode & 0x78);













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  }













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}















MCL/sf/mw/web