com.jd.blockchain.utils.io.FixedBytesSliceArray Maven / Gradle / Ivy
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package com.jd.blockchain.utils.io;
public class FixedBytesSliceArray implements BytesSlices {
private byte[] dataBytes;
private int totalSize;
private int dataOffset;
private int itemCount;
private int itemSize;
/**
* @param dataBytes
* 数据；
* @param totalSize
* 初始的偏移量；
* @param dataOffset
* 数据的起始偏移量；
* @param itemCount
* 数据片段的总数；
* @param itemSize
* 单个数据片段的大小；
*/
private FixedBytesSliceArray(byte[] dataBytes, int totalSize, int dataOffset, int itemCount, int itemSize) {
if ((dataOffset + itemCount * itemSize) > dataBytes.length) {
throw new IllegalArgumentException("The tail index of all slices is out of bound of data bytes!");
}
this.dataBytes = dataBytes;
// this.length = (dataOffset + count * size) - totalSize;
this.totalSize = totalSize;
this.dataOffset = dataOffset;
this.itemCount = itemCount;
this.itemSize = itemSize;
}
@Override
public int getTotalSize() {
return totalSize;
}
@Override
public int getCount() {
return itemCount;
}
@Override
public BytesSlice getDataSlice(int idx) {
if (idx < 0 || idx >= itemCount) {
throw new IllegalArgumentException("The specified idx is out of bound!");
}
return new BytesSlice(dataBytes, dataOffset + idx * itemSize, itemSize);
}
public static FixedBytesSliceArray resolve(BytesInputStream bytesStream, int itemSize) {
int p1 = bytesStream.getPosition();
int itemCount = (int)NumberMask.NORMAL.resolveMaskedNumber(bytesStream);
int dataOffset = bytesStream.getPosition();
bytesStream.skip(itemCount * itemSize);
int totalSize = bytesStream.getPosition() - p1;
return new FixedBytesSliceArray(bytesStream.getOriginBytes(), totalSize, dataOffset, itemCount, itemSize);
}
}