/// <summary>
///
/// </summary>
/// <param name="tid"></param>
/// <returns></returns>
private static long ReadTagIndex(this DataFileSeriserbase datafile, int tid, out long offset, out short len)
{
len = datafile.ReadShort(0);
var vsize = datafile.ReadInt(2);
offset = vsize;
lock (TagHeadOffsetManager.manager.LogHeadOffsets)
{
if (!TagHeadOffsetManager.manager.Contains(datafile.FileName))
{
var data = datafile.Read(6, vsize);
MarshalVarintCodeMemory vcm = new MarshalVarintCodeMemory(data.StartMemory, vsize);
var ltmp = vcm.ToLongList();
int addroffset = (ltmp.Count - 1) / 2;
List <int> ids = new List <int>();
List <long> addrs = new List <long>();
long lp = ltmp[1];
for (int i = 1; i < ltmp[0]; i++)
{
var lp2 = ltmp[i + 1] + lp;
ids.Add((int)lp2);
lp = lp2;
}
lp = ltmp[1 + addroffset];
for (int i = 1; i < ltmp[0]; i++)
{
var lp2 = ltmp[i + 1 + addroffset] + lp;
addrs.Add(lp2);
lp = lp2;
}
Dictionary <int, long> idaddrs = new Dictionary <int, long>();
for (int i = 0; i < ids.Count; i++)
{
idaddrs.Add(ids[i], addrs[i]);
}
TagHeadOffsetManager.manager.AddLogHead(datafile.FileName, idaddrs);
if (idaddrs.ContainsKey(tid))
{
return(idaddrs[tid]);
}
}
else
{
var idaddrs = TagHeadOffsetManager.manager.Get(datafile.FileName);
if (idaddrs.ContainsKey(tid))
{
return(idaddrs[tid]);
}
}
}
return(-1);
}
/// <summary>
///
/// </summary>
/// <param name="memory"></param>
/// <returns></returns>
public static List <long> ToLongList(this MarshalVarintCodeMemory memory)
{
List <long> re = new List <long>();
memory.Position = 0;
while (memory.Position < memory.Length)
{
re.Add(memory.ReadInt64());
}
return(re);
}
/// <summary>
///
/// </summary>
/// <param name="memory"></param>
/// <returns></returns>
public static List <int> ToIntList(this MarshalVarintCodeMemory memory)
{
List <int> re = new List <int>();
memory.Position = 0;
while (memory.Position < memory.Length)
{
re.Add(memory.ReadInt32());
}
return(re);
}
/// <summary>
/// 检测数据头部指针区域数据是否被缓存
/// </summary>
/// <param name="datafile"></param>
/// <param name="offset"></param>
/// <param name="fileDuration"></param>
/// <param name="blockDuration"></param>
/// <param name="timetick"></param>
/// <returns></returns>
public static Dictionary <int, int> CheckBlockHeadCach(this DataFileSeriserbase datafile, long offset, out int tagCount, out int fileDuration, out int blockDuration, out int timetick, out long blockPointer, out DateTime time)
{
//文件头部结构:Pre DataRegion(8) + Next DataRegion(8) + Datatime(8)+tagcount(4)+ tagid sum(8) +file duration(4)+ block duration(4)+Time tick duration(4)+ { + tagid1+tagid2+...+tagidn }+ {[tag1 block point1(8) + tag2 block point1+ tag3 block point1+...] + [tag1 block point2(8) + tag2 block point2+ tag3 block point2+...]....}
var dataoffset = offset + 16;
//读取时间
time = datafile.ReadDateTime(dataoffset);
dataoffset += 8;
//读取变量个数
int count = datafile.ReadInt(dataoffset);
dataoffset += 4;
tagCount = count;
//读取校验和
long idsum = datafile.ReadLong(dataoffset);
dataoffset += 8;
//读取单个文件的时长
fileDuration = datafile.ReadInt(dataoffset);
dataoffset += 4;
//读取数据块时长
blockDuration = datafile.ReadInt(dataoffset);
dataoffset += 4;
//读取时钟周期
timetick = datafile.ReadInt(dataoffset);
dataoffset += 4;
lock (TagHeadOffsetManager.manager)
{
if (!TagHeadOffsetManager.manager.Contains(idsum, count))
{
//Tag id 列表经过压缩，内容格式为:DataSize + Data
var dsize = datafile.ReadInt(dataoffset);
if (dsize <= 0)
{
tagCount = 0;
fileDuration = 0;
blockDuration = 0;
timetick = 0;
blockPointer = 0;
return(new Dictionary <int, int>());
}
dataoffset += 4;
blockPointer = dataoffset + dsize - offset;
var dtmp = new Dictionary <int, int>();
using (var dd = datafile.Read(dataoffset, dsize))
{
MarshalVarintCodeMemory vcm = new MarshalVarintCodeMemory(dd.StartMemory, dsize);
var ltmp = vcm.ToIntList();
//vcm.Dispose();
if (ltmp.Count > 0)
{
int preid = ltmp[0];
dtmp.Add(preid, 0);
for (int i = 1; i < ltmp.Count; i++)
{
var id = ltmp[i] + preid;
dtmp.Add(id, i);
preid = id;
}
}
TagHeadOffsetManager.manager.Add(idsum, count, dtmp, blockPointer);
dd.Dispose();
}
return(dtmp);
}
else
{
var re = TagHeadOffsetManager.manager.Get(idsum, count);
blockPointer = re.Item2;
return(re.Item1);
}
}
}
