RFR: 8170769 Provide a simple hexdump facility for binary data
Vincent Ryan
vincent.x.ryan at oracle.com
Fri Dec 7 19:51:25 UTC 2018
Even shorter. I’ll add that instead.
Thanks.
> On 7 Dec 2018, at 19:04, Roger Riggs <Roger.Riggs at oracle.com> wrote:
>
> Hi,
>
> I don't think this is performance sensitive and less code is better.
>
> Use java.lang.Character.digit(ch, 16) to convert the char to an int.
>
> Roger
>
> On 12/07/2018 01:49 PM, Kasper Nielsen wrote:
>> Hi,
>>
>> I don't know if performance is an issue. But if it is, I think it world
>> make sense to use a precompute array. And replace
>>
>> private static int hexToBinary(char ch) {
>> if ('0' <= ch && ch <= '9') {
>> return ch - '0';
>> }
>> if ('A' <= ch && ch <= 'F') {
>> return ch - 'A' + 10;
>> }
>> if ('a' <= ch && ch <= 'f') {
>> return ch - 'a' + 10;
>> }
>> return -1;
>> }
>>
>> with
>>
>> private static int hexToBinary(char ch) {
>> return ch <= 'f' ? staticPrecomputedArray[ch] : -1;
>> }
>>
>> where int[] staticPrecomputedArray is computed in a static initializer
>> block.
>>
>> /Kasper
>>
>> On Fri, 23 Nov 2018 at 14:51, Vincent Ryan <vincent.x.ryan at oracle.com>
>> wrote:
>>
>>> Hello,
>>>
>>> Please review this proposal for a new API to conveniently generate and
>>> display binary data using hexadecimal string representation.
>>> It supports both bulk and stream operations and it can also generate the
>>> well-known hexdump format [1].
>>>
>>> This latest revision addresses review comments provided earlier.
>>> These include adding methods to support for data supplied in a
>>> ByteBuffer, exposing the default formatter implementation as a public
>>> static and dropping the superfluous 'Hex' term from several method names.
>>>
>>> Thanks
>>>
>>>
>>> Bug: https://bugs.openjdk.java.net/browse/JDK-8170769
>>> API:
>>>
>>> http://cr.openjdk.java.net/~vinnie/8170769/javadoc.06/api/java.base/java/util/Hex.html
>>> Webrev: http://cr.openjdk.java.net/~vinnie/8170769/webrev.06/
>>>
>>>
>>> ____
>>> [1] https://docs.oracle.com/cd/E88353_01/html/E37839/hexdump-1.html
>>>
>
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