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C/C++ code:

static void saacproto_jEncode(char *src,int srclen,int key,char *encoded,int *encodedlen,int maxencodedlen)
{
char sum=0;
int i;
if(srclen+1 > maxencodedlen){
*encodedlen = maxencodedlen;
for(i=0;i<(*encodedlen);i++)encoded[i] = src[i];
}
if(srclen+1 <= maxencodedlen){
*encodedlen=srclen+1;
for(i=0;i<srclen;i++){
sum = sum + src[i];
if(((key%7) == (i%5))||((key%2) == (i%2))) src[i] = ~src[i];
}
for(i=0;i<(*encodedlen);i++){
if(abs((key%srclen)) > i) encoded[i] = src[i] + sum*((i*i)%3);
if(abs((key%srclen)) == i) encoded[i] = sum;
if(abs((key%srclen)) < i) encoded[i] = src[i-1] + sum*((i*i)%7);
}
}
}
static void saacproto_jDecode(char *src,int srclen,int key,char *decoded,int *decodedlen)
{
char sum=0;
int i;
*decodedlen=srclen-1;
if( *decodedlen == 0 ){
return; /* return error if length is 0 */
}
sum = src[abs(key%(*decodedlen))];
for(i=0;i<srclen;i++){
if(abs((key%(*decodedlen))) > i) decoded[i] = src[i] - sum*((i*i)%3);
if(abs((key%(*decodedlen))) < i) decoded[i-1] = src[i] - sum*((i*i)%7);
}
for(i=0;i<(*decodedlen);i++){
if(((key%7) == (i%5))||((key%2) == (i%2)))decoded[i] = ~decoded[i];
}
}


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