Function read_and_write

src/burp/split/spit.cpp:818–894

static int read_and_write(FILE_DESC input_file_desc,
						  FILE_DESC output_fl_desc,
						  //const TEXT* file_name,
						  SLONG io_size,
						  SINT64 file_size,
						  UCHAR** io_buffer,
						  bool* end_of_input,
						  SINT64* byte_read,
						  SLONG* byte_write)
{

/********************************************************************
**
**	r e a d _ a n d _ w r i t e
**
*********************************************************************
**
**	Functional description:
**
**		Read data from input file and write the data out to output
**		file.
**
*********************************************************************
*/

	SLONG read_cnt, last_read_size;

	// when number of byte read + number of byte goint to
	// be read is greater then file size, then calculate
	// the size for the last read and do the last read for
	// the current backup file. Otherwise read as mush data
	// as will fit in the current backup file.

	if (*byte_read + io_size > file_size)
	{
		last_read_size = (SLONG) (file_size - *byte_read);
		read_cnt = read_platf(input_file_desc, *io_buffer, last_read_size);
	}
	else
		read_cnt = read_platf(input_file_desc, *io_buffer, io_size);

	switch (read_cnt)
	{
	case 0:					// no more data to be read
		close_platf(output_fl_desc);
		*end_of_input = true;
		*byte_read = *byte_read + read_cnt;
		return FB_SUCCESS;

	case -1:					// read failed
		close_platf(output_fl_desc);
		fprintf(stderr,  "fail to read input from stdin, errno = %d\n", errno);
		return FB_FAILURE;

	default:					// read ok
		*byte_read = *byte_read + read_cnt;
		break;
	}