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Re: Piggypack Encoding/Decoding on RandomAccessFile

From Lew <lewbloch@gmail.com>
Newsgroups comp.lang.java.programmer
Subject Re: Piggypack Encoding/Decoding on RandomAccessFile
Date 2011-11-03 13:58 -0700
Organization http://groups.google.com
Message-ID <8910467.293.1320353913956.JavaMail.geo-discussion-forums@prmv24> (permalink)
References <j8ulue$or4$1@news.albasani.net> <j8uq9l$17l$1@dont-email.me> <j8urao$53e$1@news.albasani.net>

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On Thursday, November 3, 2011 12:50:45 PM UTC-7, Jan Burse wrote:
> Joshua Cranmer schrieb:
> > The "standard way" (at least, all of the use cases I've ever had for
> > RandomAccessFile) effectively uses the methods that are associated with
> > java.io.DataInput to read data: read(byte[]), and read*().
> 
> I would like to use an arbirary encoding/decoding on top of the
> byte stream to get a character stream. But since RandomAccessFile
> does not implement InputStream/OutputStream, I cannot create
> a InputStreamReader/OutputStreamWrite on top.

No, but you can use the 'DataInput' (and 'DataOutput') methods, as Joshua indicated.

However, the notion of encoding / decoding from a random access file seems fraught with peril.  You have to ensure that you start from a valid position in the file, not, for example, in the second byte of a three-byte character.

-- 
Lew

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Thread

Piggypack Encoding/Decoding on RandomAccessFile Jan Burse <janburse@fastmail.fm> - 2011-11-03 19:18 +0100
  Re: Piggypack Encoding/Decoding on RandomAccessFile Joshua Cranmer <Pidgeot18@verizon.invalid> - 2011-11-03 14:32 -0500
    Re: Piggypack Encoding/Decoding on RandomAccessFile Jan Burse <janburse@fastmail.fm> - 2011-11-03 20:50 +0100
      Re: Piggypack Encoding/Decoding on RandomAccessFile markspace <-@.> - 2011-11-03 13:52 -0700
        Re: Piggypack Encoding/Decoding on RandomAccessFile Jan Burse <janburse@fastmail.fm> - 2011-11-03 23:13 +0100
        Re: Piggypack Encoding/Decoding on RandomAccessFile Knute Johnson <nospam@knutejohnson.com> - 2011-11-03 16:17 -0700
      Re: Piggypack Encoding/Decoding on RandomAccessFile Lew <lewbloch@gmail.com> - 2011-11-03 13:58 -0700
      Re: Piggypack Encoding/Decoding on RandomAccessFile Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-11-03 20:40 -0400
        Re: Piggypack Encoding/Decoding on RandomAccessFile Jan Burse <janburse@fastmail.fm> - 2011-11-04 02:28 +0100
          Re: Piggypack Encoding/Decoding on RandomAccessFile Jan Burse <janburse@fastmail.fm> - 2011-11-04 03:06 +0100
            Re: Piggypack Encoding/Decoding on RandomAccessFile Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-11-04 08:05 -0400
              Re: Piggypack Encoding/Decoding on RandomAccessFile Jan Burse <janburse@fastmail.fm> - 2011-11-04 16:12 +0100
        Re: Piggypack Encoding/Decoding on RandomAccessFile rossum <rossum48@coldmail.com> - 2011-11-04 16:54 +0000
  Re: Piggypack Encoding/Decoding on RandomAccessFile Jan Burse <janburse@fastmail.fm> - 2011-11-03 23:24 +0100
  Re: Piggypack Encoding/Decoding on RandomAccessFile Arne Vajhøj <arne@vajhoej.dk> - 2011-11-03 20:14 -0400
  Re: Piggypack Encoding/Decoding on RandomAccessFile Roedy Green <see_website@mindprod.com.invalid> - 2011-11-03 21:56 -0700
    [OT] Conspiracy theories are BS (Was: Piggypack Encoding/Decoding on RandomAccessFile) Lew <lewbloch@gmail.com> - 2011-11-04 10:50 -0700
      Re: [OT] Conspiracy theories are BS (Was: Piggypack Encoding/Decoding on RandomAccessFile) Arne Vajhøj <arne@vajhoej.dk> - 2011-11-04 21:07 -0400
      Re: [OT] Conspiracy theories are BS (Was: Piggypack Encoding/Decoding on RandomAccessFile) Roedy Green <see_website@mindprod.com.invalid> - 2011-11-05 20:21 -0700
      Re: [OT] Conspiracy theories are BS (Was: Piggypack Encoding/Decoding on RandomAccessFile) Roedy Green <see_website@mindprod.com.invalid> - 2011-11-05 20:24 -0700
        Re: [OT] Conspiracy theories are BS (Was: Piggypack Encoding/Decoding on RandomAccessFile) Jan Burse <janburse@fastmail.fm> - 2011-11-06 10:36 +0100
      Re: [OT] Conspiracy theories are BS (Was: Piggypack Encoding/Decoding on RandomAccessFile) Joshua Cranmer <Pidgeot18@verizon.invalid> - 2011-11-06 14:16 -0600
  Re: Piggypack Encoding/Decoding on RandomAccessFile Stanimir Stamenkov <s7an10@netscape.net> - 2011-11-05 16:51 +0200
    Re: Piggypack Encoding/Decoding on RandomAccessFile Jan Burse <janburse@fastmail.fm> - 2011-11-05 16:27 +0100
      Re: Piggypack Encoding/Decoding on RandomAccessFile Lew <lewbloch@gmail.com> - 2011-11-05 10:03 -0700
        Re: Piggypack Encoding/Decoding on RandomAccessFile Jan Burse <janburse@fastmail.fm> - 2011-11-05 19:37 +0100
          Re: Piggypack Encoding/Decoding on RandomAccessFile Lew <lewbloch@gmail.com> - 2011-11-05 13:25 -0700
        Re: Piggypack Encoding/Decoding on RandomAccessFile Jan Burse <janburse@fastmail.fm> - 2011-11-05 19:47 +0100
        Re: Piggypack Encoding/Decoding on RandomAccessFile Jan Burse <janburse@fastmail.fm> - 2011-11-05 19:56 +0100
          Re: Piggypack Encoding/Decoding on RandomAccessFile Lew <lewbloch@gmail.com> - 2011-11-05 13:29 -0700
            Re: Piggypack Encoding/Decoding on RandomAccessFile Jan Burse <janburse@fastmail.fm> - 2011-11-06 10:42 +0100

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