AbstractIoBuffer.getSlice(int index, int length) has incorrect behavior
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Key: DIRMINA-829
URL: https://issues.apache.org/jira/browse/DIRMINA-829
Project: MINA
Issue Type: Bug
Components: Core
Affects Versions: 2.0.2
Reporter: Anton Sitnikov
Priority: Minor
All indexed access function of IoBuffer (getXXX(int index, ...)) supposed to
keep IoBuffer state intact. getSlice(int index, int length) method in
AbstractIoBuffer class behave differenlty. After its execution buffer posistion
is moved to value of index parameter:
{code}
public final IoBuffer getSlice(int index, int length) {
if (length < 0) {
throw new IllegalArgumentException("length: " + length);
}
int limit = limit();
if (index > limit) {
throw new IllegalArgumentException("index: " + index);
}
int endIndex = index + length;
if (capacity() < endIndex) {
throw new IndexOutOfBoundsException("index + length (" + endIndex
+ ") is greater " + "than capacity (" + capacity() + ").");
}
clear();
position(index);
limit(endIndex);
IoBuffer slice = slice();
position(index);
limit(limit);
return slice;
}
{code}
As you can see, this method checks also resulting slice upper limit against
original buffer capcity (not against limit), which I suppose is wrong too.
I think this method should be changed like this:
{code}
public final IoBuffer getSlice(int index, int length) {
if (length < 0) {
throw new IllegalArgumentException("length: " + length);
}
int pos = position();
int limit = limit();
if (index > limit) {
throw new IllegalArgumentException("index: " + index);
}
int endIndex = index + length;
if (endIndex > limit) {
throw new IndexOutOfBoundsException("index + length (" + endIndex
+ ") is greater " + "than capacity (" + capacity() + ").");
}
clear();
position(index);
limit(endIndex);
IoBuffer slice = slice();
position(pos);
limit(limit);
return slice;
}
{code}
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