FileInputStream: Class for reading bytes from a file

In HenrikBengtsson/R.io: [R] Class Library - File, connection and I/O classes

Description

Package: R.io
Class FileInputStream

Object
~~|
~~+--InputStream
~~~~~~~|
~~~~~~~+--FileInputStream

Directly known subclasses:

public static class FileInputStream
extends InputStream

Class for reading bytes from a file.

Usage

FileInputStream(file=NULL)

Arguments

file	A filename string or a File object specifying the input file.

Fields and Methods

Methods:

	available	Returns the number of bytes currently available in input buffer.
	close	Closes the input stream and releases the file.
	read	Reads the next byte of data from the file input stream.

Methods inherited from InputStream:
available, close, finalize, mark, markSupported, read, reset, skip

Methods inherited from Object:
$, $<-, [[, [[<-, as.character, attach, attachLocally, clearCache, clone, detach, equals, extend, finalize, gc, getEnvironment, getFields, getInstanciationTime, getStaticInstance, hasField, hashCode, ll, load, objectSize, print, save

Author(s)

Henrik Bengtsson (http://www.braju.com/R/)

Examples

path <- Package("R.io")$path
file <- file.path(path, "DESCRIPTION")

# Using a File object would also work
# file <- File(path, "DESCRIPTION")

fin <- FileInputStream(file)

printBuffer <- function(bfr, width=10) {
  s1 <- paste(formatC(bfr, digits=3), collapse=",", sep="")
  s1 <- formatC(s1, width=5*width, flag="-");
  bfr[is.element(bfr, 0:31)] <- 46;  # "."
  s2 <- paste(intToChar(bfr), collapse="")
  cat(s1, " ", s2, "\n", sep="")
}

while((bfr <- read(fin, len=10)) != -1)
  printBuffer(bfr, width=10)

close(fin)

HenrikBengtsson/R.io documentation built on May 6, 2019, 11:54 p.m.