File content as of revision 1:288ebe73ba81:

#include "DECODER.h"

struct Keyword asKeywordList[MAX_KEYWORD_NR]=
{   {ID,"id"},
    {CALLIB, "callib"},
    {GOTO, "goto"},
    {STEP, "step"}
};

void Decoder::ReplaceCharactersInString(char pcString[],char cOldChar,char cNewChar)
{
    unsigned char ucCharCounter;
    for(ucCharCounter=0;pcString[ucCharCounter]!='\0';ucCharCounter++)
    {
        if(pcString[ucCharCounter] == cOldChar) pcString[ucCharCounter] = cNewChar;
    }
}

enum Result Decoder::eHexStringToUInt(char pcStr[],unsigned int *puiValue)
{
    unsigned char ucCharCounter;
    if((pcStr[0] != '0') | (pcStr[1] != 'x') | (pcStr[2] == '\0'))
        return ERR;
    *puiValue = 0;
    for(ucCharCounter=2;ucCharCounter<7;ucCharCounter++)
    {
        if(pcStr[ucCharCounter] == '\0')
            return OK;
      *puiValue = *puiValue << 4;
        if(pcStr[ucCharCounter] >= 'A')
            *puiValue = *puiValue | (pcStr[ucCharCounter] - 'A' + 10);
        else
            *puiValue = *puiValue | (pcStr[ucCharCounter] - '0');
    }
    return OK;
}

unsigned char Decoder::ucFindTokensInString(char *pcString)
{
    unsigned char ucTokenPointer;
    unsigned char ucDelimiterCounter;
    char cCurrentChar;
    enum State {TOKEN, DELIMITER};
    enum State eState = DELIMITER;
    ucDelimiterCounter = 0;

    for(ucTokenPointer=0;;ucTokenPointer++)
    {
        cCurrentChar = pcString[ucTokenPointer];
        switch(eState)
        {
            case DELIMITER:
                if(cCurrentChar == '\0')
                    return ucDelimiterCounter;
                else if(cCurrentChar == ' ') {}
                else
                {
                    eState = TOKEN;
                    asToken[ucDelimiterCounter].uValue.pcString = pcString+ucTokenPointer;
                    asToken[ucDelimiterCounter].eType = KEYWORD; //not empty
                    ucDelimiterCounter++;
                }
                break;
            case TOKEN:
                if(cCurrentChar == '\0')
                    return ucDelimiterCounter;
                else if(ucDelimiterCounter == MAX_TOKEN_NR)
                    return ucDelimiterCounter;
                else if(cCurrentChar != ' ') {}
                else
                    eState = DELIMITER;
                break;
        }
    }
}

enum Result Decoder::eStringToKeyword (char pcStr[],enum KeywordCode *peKeywordCode)
{
    unsigned char ucTokenCounter;
    for(ucTokenCounter=0;ucTokenCounter<MAX_KEYWORD_NR;ucTokenCounter++)
    {
        if (strcmp(pcStr,asKeywordList[ucTokenCounter].cString) == 0)
        {
            *peKeywordCode = asKeywordList[ucTokenCounter].eCode;
            return OK;
        }
    }
    return ERR;
}

enum Result Decoder::DecodeTokens()
{
    unsigned char ucTokenCounter;
    Token* tValue;
    for(ucTokenCounter=0;ucTokenCounter<MAX_TOKEN_NR;ucTokenCounter++)
    {
        tValue = &asToken[ucTokenCounter];
        if ((tValue->uValue.pcString == '\0') || (tValue->eType == EMPTY)) break;
        if (eStringToKeyword(tValue->uValue.pcString,&tValue->uValue.eKeyword) == OK) tValue->eType = KEYWORD;
        else if (eHexStringToUInt(tValue->uValue.pcString,&tValue->uValue.uiNumber) == OK) tValue->eType = NUMBER;
        else return ERR;
    }
    return OK;
}

enum Result Decoder::DecodeMsg(char *pcString)
{
    unsigned char ucTokenCounter;
    for(ucTokenCounter=0;ucTokenCounter<MAX_TOKEN_NR;ucTokenCounter++)
    {
        asToken[ucTokenCounter].eType = EMPTY;
    }

    ucFindTokensInString(pcString);
    ReplaceCharactersInString(pcString,' ','\0');
    if(DecodeTokens() == ERR)
        return ERR;
    else
        return OK;
}