Ερώτηση στην C

[k33theod]

Δες και μια πιο ετσι προσεγγση

 

 

int decode(const char* input, char* output, int szOutput);
int encode(const char* input, char* output, int szOutput);
void print(const char* s);
void fillRandomRepeat(char* input, int len, const char* palet);

int main(int, char**)
{
	char buf[512] = { 0 };
	char buf1[512] = { 0 };
	char *it;
	int ret,i;

	fillRandomRepeat(buf, 511, "abcdefg");
	printf("random data\n");
	print(buf);

	ret = encode(buf, buf1, 511);
	printf("encoded data\n");
	print(buf1);
	ret = decode(buf1, buf, 511);
	printf("decoded data\n");
	print(buf);

	return 0;
}

int decode(const char* input, char* output, int szOutput)
{
	int len = 0;
	const char* it = input;
	int charCount;
	for (;
	{
		charCount = atoi(it);
		if (!charCount)
			charCount = 1; //default;
		for (; !isalpha(*it) && *it; ++it);
		len += charCount + 1;
		if (szOutput < len && output)
			return -1;
		if (output)
			for (; charCount > 0; charCount--)
				*output++ = *it;

		if (*it++ == NULL)
			break;
	}
	return len;
}

int encode(const char* input, char* output, int szOutput)
{
	const char* it = input;
	int len = 0;
	char buf[128];
	int counter = 1;
	char currentChar = *it;

	if (strlen(input) < 2)
		return -1;

	do
	{
		it++;
		if (currentChar != *it)
		{
			if (counter > 1)
			{
				itoa(counter, buf, 10);
				len += strlen(buf);
				if (len > szOutput)
					return -1;
				
				strcpy(output, buf);
				output += strlen(buf);
			}
			if (len++ > szOutput)
				return -1;
			counter = 0;
			*output++ = currentChar;
			currentChar = *it;
		

			
		}
		counter++;
	} while (*it != NULL);
	return len;
}
void print(const char* s)
{
	printf("======= data begin ==========\n%s\n========= data end ============\n", s);
}

void fillRandomRepeat(char* input, int len,const char* palet)
{
	int i, paletSize;
	char r = *palet;
	paletSize = strlen(palet);
	for (i = 0; i < len; i++)
	{
		if (rand() % 100 < 30)
			r = palet[rand() % paletSize];
		input[i] = r;
	}
} 

 

 

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