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/*********************************************************************
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*
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* Helper Functions for Microchip TCP/IP Stack
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*
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*********************************************************************
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* FileName: Helpers.C
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* Dependencies: compiler.h
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* helpers.h
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* Processor: PIC18
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* Complier: MCC18 v1.00.50 or higher
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* HITECH PICC-18 V8.10PL1 or higher
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* Company: Microchip Technology, Inc.
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*
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* Software License Agreement
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*
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* The software supplied herewith by Microchip Technology Incorporated
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* (the “Company”) for its PICmicro® Microcontroller is intended and
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* supplied to you, the Company’s customer, for use solely and
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* exclusively on Microchip PICmicro Microcontroller products. The
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* software is owned by the Company and/or its supplier, and is
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* protected under applicable copyright laws. All rights are reserved.
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* Any use in violation of the foregoing restrictions may subject the
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* user to criminal sanctions under applicable laws, as well as to
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* civil liability for the breach of the terms and conditions of this
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* license.
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*
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* THIS SOFTWARE IS PROVIDED IN AN “AS IS” CONDITION. NO WARRANTIES,
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* WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED
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* TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. THE COMPANY SHALL NOT,
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* IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL OR
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* CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
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*
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* HiTech PICC18 Compiler Options excluding device selection:
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* -FAKELOCAL -G -E -C
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*
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*
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*
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* Author Date Comment
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*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* Nilesh Rajbharti 5/17/01 Original (Rev 1.0)
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* Nilesh Rajbharti 2/9/02 Cleanup
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* Nilesh Rajbharti 6/25/02 Rewritten CalcIPChecksum() to avoid
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* multi-byte shift operation.
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********************************************************************/
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#include "compiler.h"
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#include "helpers.h"
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WORD swaps(WORD v)
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{
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WORD_VAL t;
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BYTE b;
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t.Val = v;
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b = t.v[1];
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t.v[1] = t.v[0];
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t.v[0] = b;
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return t.Val;
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}
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DWORD swapl(DWORD v)
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{
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BYTE b;
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DWORD myV;
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DWORD_VAL *myP;
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myV = v;
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myP = (DWORD_VAL*)&myV;
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b = myP->v[3];
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myP->v[3] = myP->v[0];
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myP->v[0] = b;
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b = myP->v[2];
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myP->v[2] = myP->v[1];
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myP->v[1] = b;
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return myV;
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}
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WORD CalcIPChecksum(BYTE* buffer, WORD count)
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{
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WORD i;
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WORD *val;
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union
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{
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DWORD Val;
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struct
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{
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WORD_VAL LSB;
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WORD_VAL MSB;
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} words;
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} tempSum, sum;
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sum.Val = 0;
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i = count >> 1;
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val = (WORD *)buffer;
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while( i-- )
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sum.Val += *val++;
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if ( count & 1 )
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sum.Val += *(BYTE *)val;
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tempSum.Val = sum.Val;
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while( (i = tempSum.words.MSB.Val) != 0 )
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{
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sum.words.MSB.Val = 0;
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sum.Val = (DWORD)sum.words.LSB.Val + (DWORD)i;
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tempSum.Val = sum.Val;
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}
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return (~sum.words.LSB.Val);
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}
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#if defined(HITECH_C18)
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char *strupr (char *s)
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{
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char c;
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char *t;
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t = s;
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while( (c = *t) )
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{
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if ( (c >= 'a' && c <= 'z') )
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*t -= ('a' - 'A');
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t++;
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}
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return s;
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}
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#endif
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#if defined(HITECH_C18)
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void *mymemcpy(void * d1, const void * s1, register unsigned char n)
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{
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register char * d;
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register const char * s;
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s = s1;
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d = d1;
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while(n--)
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*d++ = *s++;
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return d1;
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}
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#endif
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