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From "Gary Gregory (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (LANG-341) Add number to byte array methods
Date Thu, 24 Nov 2016 18:49:58 GMT

    [ https://issues.apache.org/jira/browse/LANG-341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15694008#comment-15694008
] 

Gary Gregory edited comment on LANG-341 at 11/24/16 6:49 PM:
-------------------------------------------------------------

The best way to start moving this ticket forward again is to make sure the patch applies against
our Git master branch and that the new code has as close to 100% code coverage.


was (Author: garydgregory):
The best way to start moving the forward again is to make sure the patch applies against our
Git master branch and that the new code has as close to 100% code coverage.

> Add number to byte array methods
> --------------------------------
>
>                 Key: LANG-341
>                 URL: https://issues.apache.org/jira/browse/LANG-341
>             Project: Commons Lang
>          Issue Type: New Feature
>          Components: lang.*
>            Reporter: Lilianne E. Blaze
>             Fix For: Discussion
>
>         Attachments: 341-v1-src.patch, 341-v1-test.patch, LANG-341-2.patch, LANG-341.patch
>
>
> Hello,
> I need a set of methods to convert Long to or from a byte[] array, as if
> writing / reading from Data(Input/Output)Stream(
> ByteArray(Input/Output)Stream ).
> First, doing it with Streams seems a bit wasteful, second, it seems a
> pretty general use. Would it be possible to add something like that to,
> for example,
> org.apache.commons.lang.math.NumberUtils?
> Example code:
> {code:java}
> static public long toLong(byte[] b)
>   {
>     return toLong(b, 0);
>   }
>   
>   static public long toLong(byte[] b, int offset)
>   {
>     return (((long)b[offset] << 56) +
>         ((long)(b[offset + 1] & 255) << 48) +
>         ((long)(b[offset + 2] & 255) << 40) +
>         ((long)(b[offset + 3] & 255) << 32) +
>         ((long)(b[offset + 4] & 255) << 24) +
>         ((b[offset + 5] & 255) << 16) +
>         ((b[offset + 6] & 255) <<  8) +
>         ((b[offset + 7] & 255) <<  0));
>   }
>   
>   static public byte[] longToByteArray(long l)
>   {
>     byte b[] = new byte[8];
>     longToByteArray(l, b, 0);
>     return b;
>   }
>   
>   static public void longToByteArray(long l, byte b[], int offset)
>   {
>     b[offset] = (byte)(l >>> 56);
>     b[offset + 1] = (byte)(l >>> 48);
>     b[offset + 2] = (byte)(l >>> 40);
>     b[offset + 3] = (byte)(l >>> 32);
>     b[offset + 4] = (byte)(l >>> 24);
>     b[offset + 5] = (byte)(l >>> 16);
>     b[offset + 6] = (byte)(l >>>  8);
>     b[offset + 7] = (byte)(l >>>  0);
>   }
> {code}



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