[英]difference of 2 byte arrays
I have a byte array which can have up to 4000 elements. 我有一个字节数组,最多可以包含4000个元素。 These elementes can be byte/boolean(1 byte) int(2 byte) or long/float(4byte).
这些元素可以是byte / boolean(1个字节)int(2个字节)或long / float(4个字节)。 They are not mixed, so one byte array only contains one data type
它们没有混合,因此一个字节数组仅包含一种数据类型
If the array changes I want to get the position which is affected.. but if arr[5] changes, it is for example the second real value which has changed! 如果数组改变了,我想得到受影响的位置。.但是如果arr [5]改变了,例如第二个实数值就改变了! but if it is a boolean it is the 6th value.
但如果是布尔值,则为第6个值。
so far I have done this 到目前为止,我已经做到了
private void diff(byte[] a, byte[] b){
if (a.length == b.length) {
for (int i = 0; i < getCount(); i++) {
if (!get(MyType.real,i, b).equals(get(MyType.real,i, a))) {
//difference
}
}
this.data = data;
}
}
private Object get(MyType type, int idx, byte[] data) {
logger.entry(idx, data);
ByteBuffer buffer = ByteBuffer.wrap(data)
.order(ByteOrder.LITTLE_ENDIAN);
switch (type) {
case BOOL:
return logger.exit(buffer.get(idx) > 0);
case DWORD:
return logger.exit(buffer.asIntBuffer().get(idx));
case INT:
return logger.exit(buffer.asShortBuffer().get(idx));
case REAL:
return logger.exit(buffer.asFloatBuffer().get(idx));
case TIME:
return logger.exit(buffer.asIntBuffer().get(idx));
default:
return logger.exit(buffer.get(idx));
}
}
but this takes quite a while. 但这需要一段时间。 Any Ideas to improve the performance?
有任何改善性能的想法吗?
I think your code is too complicated. 我认为您的代码太复杂了。 You could find the absolute position of the difference and then divide it by the size of the array type.
您可以找到差异的绝对位置,然后将其除以数组类型的大小。
Example code: 示例代码:
private int diffpos(byte[] a, byte[] b, int typeLenght){
if (a.length == b.length) {
for (int i = 0; i < a.length; i++) {
if (a[i] != b[i]) {
return i / typeLenght;
}
}
}
return 0;
}
Find the first difference by comparing bytes and then divide this index by the size of a single element in the buffer: 通过比较字节来找到第一个差异,然后将该索引除以缓冲区中单个元素的大小:
int pos = findFirstDifference(a, b);
pos /= type.elementSize();
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