public override void Get(long index, sbyte[] into)
{
long pageId = pageId(index);
int offset = offset(index);
try
{
using (PageCursor cursor = PagedFile.io(pageId, PF_SHARED_READ_LOCK))
{
cursor.Next();
do
{
for (int i = 0; i < into.Length; i++)
{
into[i] = cursor.GetByte(offset + i);
}
} while (cursor.ShouldRetry());
CheckBounds(cursor);
}
}
catch (IOException e)
{
throw new UncheckedIOException(e);
}
}
public override void Swap(long fromIndex, long toIndex)
{
long fromPageId = PageId(fromIndex);
int fromOffset = Offset(fromIndex);
long toPageId = PageId(toIndex);
int toOffset = Offset(toIndex);
try
{
using (PageCursor fromCursor = PagedFile.io(fromPageId, PF_SHARED_WRITE_LOCK), PageCursor toCursor = PagedFile.io(toPageId, PF_SHARED_WRITE_LOCK))
{
fromCursor.Next();
toCursor.Next();
for (int i = 0; i < EntrySize; i++, fromOffset++, toOffset++)
{
sbyte intermediary = fromCursor.GetByte(fromOffset);
fromCursor.PutByte(fromOffset, toCursor.GetByte(toOffset));
toCursor.PutByte(toOffset, intermediary);
}
}
}
catch (IOException e)
{
throw new UncheckedIOException(e);
}
}
public override int Get3ByteInt(long index, int offset)
{
long pageId = pageId(index);
offset += offset(index);
try
{
using (PageCursor cursor = PagedFile.io(pageId, PF_SHARED_READ_LOCK))
{
cursor.Next();
int result;
do
{
int lowWord = cursor.GetShort(offset) & 0xFFFF;
int highByte = cursor.GetByte(offset + Short.BYTES) & 0xFF;
result = lowWord | (highByte << (sizeof(short) * 8));
} while (cursor.ShouldRetry());
CheckBounds(cursor);
return(result == 0xFFFFFF ? -1 : result);
}
}
catch (IOException e)
{
throw new UncheckedIOException(e);
}
}
public override long Get5ByteLong(long index, int offset)
{
long pageId = pageId(index);
offset += offset(index);
try
{
using (PageCursor cursor = PagedFile.io(pageId, PF_SHARED_READ_LOCK))
{
cursor.Next();
long result;
do
{
long low4b = cursor.GetInt(offset) & 0xFFFFFFFFL;
long high1b = cursor.GetByte(offset + Integer.BYTES) & 0xFF;
result = low4b | (high1b << (sizeof(int) * 8));
} while (cursor.ShouldRetry());
CheckBounds(cursor);
return(result == 0xFFFFFFFFFFL ? -1 : result);
}
}
catch (IOException e)
{
throw new UncheckedIOException(e);
}
}
public override sbyte GetByte(long index, int offset)
{
long pageId = pageId(index);
offset += offset(index);
try
{
using (PageCursor cursor = PagedFile.io(pageId, PF_SHARED_READ_LOCK))
{
cursor.Next();
sbyte result;
do
{
result = cursor.GetByte(offset);
} while (cursor.ShouldRetry());
CheckBounds(cursor);
return(result);
}
}
catch (IOException e)
{
throw new UncheckedIOException(e);
}
}
internal static sbyte NodeType(PageCursor cursor)
{
return(cursor.GetByte(BYTE_POS_NODE_TYPE));
}
// HEADER METHODS
internal static sbyte TreeNodeType(PageCursor cursor)
{
return(cursor.GetByte(BytePosType));
}
