#include <stdio.h>
#include <string.h>

typedef struct{
	unsigned char pream;
	unsigned char packetType;
	unsigned char dataLen;
	unsigned char data;
	unsigned char hash;
}packet;

int main(int argc, char* argv[])
{
	if (argc < 2)
		return 1;

	packet pac;
	FILE *pFile = fopen(argv[1], "rb");

	if (!pFile){
		printf("Can`t open file\n");
		return 1;
	}


	unsigned short buf;
	fread(&buf, sizeof(unsigned char), sizeof(buf), pFile);
	// pream ppppXXXX XXXXXXXX
	// type  XXXXtttX XXXXXXXX
	// len   XXXXXXXl llXXXXXX
	//       01011101 01NNNNNN NNNNNNNN NNNNNNNN NNNNNNNN NNNNNNNN NNCCCCXX
	// 01NNNNNN 01011101
	buf = ntohs(buf);
	// 01011101 01NNNNNN

	unsigned long long data = buf & 0x3F; // 0011 1111
	buf = buf >> 6;
	// 000000 0101110101
	unsigned char pream = (buf >> 6) & 0xF;
	unsigned char type = (buf >> 3) & 0x7;
	unsigned char len = buf & 0x7;
	unsigned char databuf[8];

	fread(databuf, sizeof(unsigned char), len, pFile);
	for (unsigned i = 0; i < len - 1; ++i)
		data = (data << 8) | databuf[i];
	data = (data << 2) | ((databuf[i] >> 6) & 0x3);




	while (!feof(pFile)){
		fread(&pac, sizeof(unsigned char), sizeof(pac), pFile);
	}

	fclose(pFile);
	printf("End operations...\n");

	return 0;
}