ByteBuffer.getString(ByteBuffer buf, int fieldSize, CharsetDecoder decoder,
boolean stopOnZero )
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Key: DIRMINA-242
URL: http://issues.apache.org/jira/browse/DIRMINA-242
Project: Directory MINA
Issue Type: New Feature
Affects Versions: 0.8.2
Reporter: Pavel Zdenek
Priority: Trivial
The method would read an ASCIIZ string off the buffer as the existing method
without added parameter.
If stopOnZero is false, it would continue blindly reading the stream up to the
required fieldSize.
So far MINA has no support for reading fixed (small) size strings. This is
common for protocols constructed at devices with limited resources (i.e.
network attached microcontrollers) and above the mandatory ending zero may be
whatever garbage left from previous memory usage.
My temporary implementation follows, to get the idea.
It also solves the problem with getString behavior when reading ASCIIZ at the
end of buffer (apparently fixed in dev 0.9)
public static String getString(ByteBuffer buf, int fieldSize,
CharsetDecoder decoder, boolean stopOnZero )
throws CharacterCodingException
{
if( fieldSize == 0) fieldSize = buf.remaining(); // convenience "0 ~
till the end"
int origLimit = buf.limit();
int posStrEnd = 0;
buf.mark(); // beginning of string
boolean foundZero = false;
while(buf.hasRemaining() && (fieldSize-- > 0) )
{
if( (buf.get() == 0) && !foundZero )
{
foundZero = true;
posStrEnd = buf.position()-1;
if( stopOnZero ) break;
}
}
int reachedPos = buf.position(); // later must return here
buf.reset(); // position to string begin
if(foundZero) buf.limit( posStrEnd );
String str = buf.getString(decoder);
if(foundZero) buf.limit(origLimit);
buf.position(reachedPos);
return str;
}
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