#include "stdafx.h"
#include "exchanger.h"


int Exchanger::initlize(char *src, char *tag)
{
	if ((m_pSourceFile = fopen(src, "r")) == NULL)
	{
		return 1;
	}

	if ((m_pTargetFile = fopen(tag, "wb")) == NULL)
	{
		return 2;
	}
	return 0;
};


int Exchanger::process()
{
    char CapHeader[] = { 0xD4, 0xC3, 0xB2, 0xA1, 0x02, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		                 0xFF, 0xFF, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00};

	char TimeStamp[8] = {0x0b, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};

    int iFrameLength = 0;
    char chCountBuf[2];
	char buf[4096];
	int i = 0, j = 0, totalLen = 0;
	char chRdbuf = 0;
    char hexNum;

    if ((m_pSourceFile == NULL) || (m_pTargetFile == NULL))
    {
	    return -1;
	}

	memset(buf, 0, 4096);

	// write the header
	fwrite(CapHeader, 24, 1, m_pTargetFile);

	while ((chRdbuf = getc(m_pSourceFile)) != EOF)
	{
	    switch(chRdbuf)
		{
		case ' ':
		case '\n':
			hexNum = chCountBuf[0]*16 + chCountBuf[1];
			buf[j] = hexNum;
			j++;
			memset(chCountBuf, 0, 2);
			i = 0;
		    break;
		case '0':
		case '1':
		case '2':
		case '3':
		case '4':
		case '5':
		case '6':
		case '7':
		case '8':
		case '9':
            chCountBuf[i] = chRdbuf - 48;
            i++;
			break;
		case 'A':
		case 'B':
		case 'C':
		case 'D':
		case 'E':
		case 'F':
            chCountBuf[i] = chRdbuf - 55;
            i++;
			break;
		case 'a':
		case 'b':
		case 'c':
		case 'd':
		case 'e':
		case 'f':
            chCountBuf[i] = chRdbuf - 87;
            i++;
			break;
		case '#':
			totalLen = j;
//			j = j - 4;  // using for loop length, from 0 to

			fwrite(TimeStamp, 8, 1, m_pTargetFile);
			fwrite(&totalLen,  4, 1, m_pTargetFile);
			fwrite(&totalLen,  4, 1, m_pTargetFile);

//			memcpy(buf, &j, sizeof(j));
//			memcpy(&buf[totalLen], &iTail, sizeof(int));
			fwrite(buf, totalLen, 1, m_pTargetFile);
            chRdbuf = getc(m_pSourceFile);

			// start a new one
            j = 0;
			i = 0;
			totalLen = 0;
            memset(buf, 0, 4096);
			break;
		default:
			break;
		}
	}

	fclose(m_pSourceFile);
	fclose(m_pTargetFile);
    return 0;
}