public LargeArray <T> Clone()
{
var cloned = new LargeArray <T>(mCount);
cloned.CopyFrom(this, 0, 0, mCount);
return(cloned);
}
public LargeArray <T> Resize(long newCount)
{
var result = new LargeArray <T>(newCount);
long copyCount = newCount;
if (mCount < copyCount)
{
copyCount = mCount;
}
CopyTo(0, ref result, 0, copyCount);
return(result);
}
public LargeArray <T> Skip(long count)
{
if (mCount <= count)
{
return(new LargeArray <T>(0));
}
if (count < 0)
{
throw new ArgumentOutOfRangeException("count");
}
var r = new LargeArray <T>(mCount - count);
CopyTo(count, ref r, 0, mCount - count);
return(r);
}
public long CopyTo(long fromPos, ref LargeArray <T> to, long toPos, long count)
{
if (to == null)
{
throw new ArgumentNullException("to");
}
if (fromPos < 0 || mCount < fromPos + count)
{
throw new ArgumentOutOfRangeException("fromPos");
}
if (toPos < 0 || to.LongLength < toPos + count)
{
throw new ArgumentOutOfRangeException("toPos");
}
if (count < 0)
{
throw new ArgumentOutOfRangeException("count");
}
for (long remain = count; 0 < remain;)
{
int fragmentCount = ARRAY_FRAGMENT_LENGTH_NUM;
if (remain < fragmentCount)
{
fragmentCount = (int)remain;
}
var fragment = new T[fragmentCount];
CopyTo(fromPos, ref fragment, 0, fragmentCount);
to.CopyFrom(fragment, 0, toPos, fragmentCount);
fromPos += fragmentCount;
toPos += fragmentCount;
remain -= fragmentCount;
}
return(count);
}
public static LargeArray <T> GetLargeArrayFragment(List <T[]> from, long startPos, long count)
{
if (startPos < 0)
{
throw new ArgumentOutOfRangeException("startPos");
}
if (count < 0)
{
throw new ArgumentOutOfRangeException("count");
}
var r = new LargeArray <T>(count);
long accPos = 0;
long toPos = 0;
foreach (var item in from)
{
// 例1:
// startPos = 10
// bytes = 10
// itemLen=8のとき、
// 1個目のitemは accPos=0, itemLen=8 → スキップ。
// 2個目のitemは accPos=8, itemLen=8 → fromPos=2, toPos = 0, copyCount=6
// 3個目のitemは accPos=16, itemLen=8 → fromPos=0, toPos = 6, copyCount=4
if (accPos + item.Length <= startPos)
{
// まだ最初の取得位置よりも前。
accPos += item.Length;
continue;
}
// ちょうど取得データが有る場所に来た。
int fromPos = (int)(startPos - accPos);
int copyCount = item.Length;
if (startPos + count < fromPos + item.Length)
{
copyCount = (int)((startPos + count) - fromPos);
}
if (0 < copyCount)
{
r.CopyFrom(item, fromPos, toPos, copyCount);
toPos += copyCount;
}
else
{
// 最後のコピーデータよりも後の位置に来た。
break;
}
}
if (toPos < count)
{
// toPos個しか取得できなかったので戻り配列rのサイズを変更する。
var tmp = new LargeArray <T>(toPos);
tmp.CopyFrom(r, 0, 0, toPos);
r = tmp;
}
return(r);
}
