22 messages in org.postgresql.pgsql-jdbcjava & endianness [Re: Binary tx form...
FromSent OnAttachments
Michael GuyverJun 21, 2006 10:26 am 
Dave CramerJun 21, 2006 12:55 pm 
Mark LewisJun 21, 2006 1:31 pm 
Tom LaneJun 21, 2006 3:40 pm 
Michael GuyverJun 22, 2006 1:16 am 
Tom LaneJun 22, 2006 9:54 am 
Mark LewisJun 22, 2006 12:15 pm 
Michael GuyverJun 23, 2006 1:22 am 
Dave CramerJun 23, 2006 4:43 am 
Markus SchaberJun 23, 2006 4:59 am 
Michael GuyverJun 23, 2006 5:46 am 
Dave CramerJun 23, 2006 5:56 am 
Dave CramerJun 23, 2006 6:16 am 
Tom LaneJun 23, 2006 9:18 am 
Mark LewisJun 23, 2006 1:31 pm 
Dave CramerJun 23, 2006 1:39 pm 
Kris JurkaJun 23, 2006 1:46 pm 
Mark LewisJun 23, 2006 1:59 pm 
Marc HerbertJul 10, 2006 2:19 am 
Mark LewisJul 10, 2006 9:18 am 
Marc HerbertJul 10, 2006 10:53 am 
Mark LewisJul 10, 2006 11:59 am 
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Subject:java & endianness [Re: Binary tx format for an array?]Actions...
From:Marc Herbert (Marc@continuent.com)
Date:Jul 10, 2006 2:19:21 am
List:org.postgresql.pgsql-jdbc

Mark Lewis <mark@mir3.com> writes:

Java tried so hard to hide endianness from you that it didn't provide any real support for those times when you DO need to be aware of it.

Could you give sample cases when you DO need it? I don't think that many people write hardware drivers in Java ;-)

I don't think network communication qualifies either, see below.

So the "convention" looks kind of like this (snipped from the PG JDBC driver):

public void SendInteger4(int val) throws IOException { SendChar((val >> 24)&255); SendChar((val >> 16)&255); SendChar((val >> 8)&255); SendChar(val&255); }

This code is like copied/pasted from the JDK:

* @since JDK1.0 DataOutputStream#writeInt()

Any reason for duplicating it in the driver?

There finally were endian-aware buffer operations added in JDK 1.4,

Could you detail which ones? Thanks in advance.