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

#include "utils.h"

#define BUF_SIZE	100

int main (void)
{
	HANDLE hFile;
	DWORD dwBytesRead, dwPos, dwBytesToRead = BUF_SIZE, dwRet;
	BOOL bRet;
	CHAR outBuffer[BUF_SIZE+1];

	/* deschidem fisierul */
	hFile = CreateFile(
			"file.txt",
			GENERIC_READ,
			FILE_SHARE_READ,
			NULL,	/* no security attributes */
			OPEN_EXISTING,
			FILE_ATTRIBUTE_NORMAL,
			NULL	/* no pattern */
		);
	DIE(hFile == INVALID_HANDLE_VALUE, "CreateFile");

	/* set file pointer at 100 bytes
	_before_ the end of file */
	dwPos = SetFilePointer(
			hFile,
			-100,
			NULL,	/* used only for offsets on 64bytes */
			FILE_END
	);
	DIE(dwPos == INVALID_SET_FILE_POINTER, "SetFilePointer");
        
	/* read last 100 bytes into buffer */
	dwRet = ReadFile(
			hFile,
			outBuffer,
			dwBytesToRead,
			&dwBytesRead,
			NULL);	/* do nothing asynchronous */
	DIE(dwRet == FALSE, "ReadFile");

	/* print buffer */
	outBuffer[dwBytesRead] = '\0';
	printf("last %ld bytes: \n%s\n", dwBytesRead, outBuffer);
	fflush(stdout);

	/* close file */
	bRet = CloseHandle (hFile);
	DIE(bRet == FALSE, "CloseHandle");

	return 0;
}