/// <summary>
///
/// </summary>
/// <param name="datafile"></param>
/// <param name="startTime"></param>
/// <param name="tid"></param>
/// <param name="offset"></param>
/// <param name="start"></param>
/// <param name="end"></param>
/// <param name="timetick"></param>
/// <returns></returns>
private static IEnumerable <Tuple <MarshalMemoryBlock, DateTime, DateTime, int> > ReadTagDataBlock2(DataFileSeriserbase datafile, int tid, long offset, DateTime start, DateTime end)
{
int fileDuration, blockDuration = 0;
int tagCount = 0;
long blockpointer = 0;
int timetick = 0;
DateTime time;
//var tagIndex = ReadTagIndexInDataPointer(datafile,tid, offset, out tagCount, out fileDuration, out blockDuration, out timetick, out blockpointer, out time);
ReadRegionHead(datafile, offset, out tagCount, out fileDuration, out blockDuration, out timetick, out blockpointer, out time);
var tagIndex = tid % tagCount;
int blockcount = fileDuration * 60 / blockDuration;
//读取文件开始时间
var startTime = datafile.ReadDateTime(0);
DateTime sstart = start;
DateTime send = end;
int buffersize = 1024 * 1024 * 2;
//分配读缓存
IntPtr mdataBuffer = Marshal.AllocHGlobal(buffersize);
long mbufferadderss = 0;
int bufferLen = 0;
//var headdata = GetHeadBlock(datafile, offset + blockpointer, tagCount * blockcount * 12);
var headdata = datafile.Read(offset + blockpointer + tagIndex * blockcount * 8, blockcount * 8);
while (sstart < end)
{
var ttmp = Math.Round((sstart - startTime).TotalSeconds, 3);
var vv = blockDuration * 60 - (ttmp % (blockDuration * 60));
send = sstart.AddSeconds(vv);
if (send > end)
{
send = end;
}
int blockindex = (int)(ttmp / (blockDuration * 60));
if (blockindex >= blockcount)
{
break;
//throw new Exception("DataPointer index is out of total block number");
}
var dataPointer = headdata.ReadInt(blockindex * 8); //读取DataBlock的相对地址
if (dataPointer > 0)
{
MarshalMemoryBlock vmm = null;
//说明数据没有采用Zip压缩，可以直接读取使用
var dp = dataPointer;
int datasize = 0;
int dataloc = 0;
if (dp >= mbufferadderss && (dp - mbufferadderss + 4) <= bufferLen && (dp - mbufferadderss + 4 + MemoryHelper.ReadInt32(mdataBuffer, dp - mbufferadderss)) <= bufferLen)
{
datasize = MemoryHelper.ReadInt32(mdataBuffer, dp - mbufferadderss);
dataloc = (int)(dp - mbufferadderss + 4);
}
else
{
bufferLen = datafile.Read(mdataBuffer, dp, buffersize);
mbufferadderss = dp;
datasize = MemoryHelper.ReadInt32(mdataBuffer, 0);
dataloc = (int)(dp - mbufferadderss + 4);
}
if (datasize > 0 && datasize < datafile.Length)
{
vmm = new MarshalMemoryBlock(datasize, datasize);
MemoryHelper.MemoryCopy(mdataBuffer, dataloc, vmm.Buffers[0], 0, datasize);
}
if (vmm != null)
{
yield return(new Tuple <MarshalMemoryBlock, DateTime, DateTime, int>(vmm, sstart, send, timetick));
}
}
sstart = send;
}
headdata.Dispose();
Marshal.FreeHGlobal(mdataBuffer);
}
/// <summary>
///
/// </summary>
/// <param name="datafile"></param>
/// <param name="tid"></param>
/// <param name="offset"></param>
/// <param name="dataTimes"></param>
/// <param name="timetick"></param>
/// <returns></returns>
private static Dictionary <MarshalMemoryBlock, Tuple <List <DateTime>, int> > ReadTagDataBlock2(DataFileSeriserbase datafile, int tid, long offset, List <DateTime> dataTimes, out int timetick)
{
int fileDuration, blockDuration = 0;
int tagCount = 0;
long blockpointer = 0;
DateTime time;
//var tagIndex = ReadTagIndexInDataPointer(datafile,tid, offset, out tagCount, out fileDuration, out blockDuration, out timetick, out blockpointer, out time);
ReadRegionHead(datafile, offset, out tagCount, out fileDuration, out blockDuration, out timetick, out blockpointer, out time);
var tagIndex = tid % tagCount;
Dictionary <long, MarshalMemoryBlock> rtmp = new Dictionary <long, MarshalMemoryBlock>();
Dictionary <MarshalMemoryBlock, Tuple <List <DateTime>, int> > re = new Dictionary <MarshalMemoryBlock, Tuple <List <DateTime>, int> >();
if (tagCount == 0)
{
return(re);
}
int blockcount = fileDuration * 60 / blockDuration;
var startTime = datafile.ReadDateTime(0);
int buffersize = 1024 * 1024 * 2;
//分配读缓存
IntPtr mdataBuffer = Marshal.AllocHGlobal(buffersize);
long mbufferadderss = 0;
int bufferLen = buffersize;
// var headdata = GetHeadBlock(datafile, offset + blockpointer, tagCount * blockcount * 12);
var headdata = datafile.Read(offset + blockpointer + tagIndex * blockcount * 8, blockcount * 8);
long mLastBuffer = 0;
int mLastDataLoc = 0;
int mLastDataSize = 0;
MarshalMemoryBlock vmm = null;
foreach (var vdd in dataTimes)
{
var ttmp = (vdd - startTime).TotalMinutes;
int blockindex = (int)(ttmp / blockDuration);
if (blockindex > blockcount)
{
throw new Exception("DataPointer index is out of total block number");
}
//var dataPointer = headdata.ReadInt(tagIndex * blockcount * 12 + blockindex * 12); //读取DataBlock的相对地址
//var dataPointerbase = headdata.ReadLong(tagIndex * blockcount * 12 + blockindex * 12 + 4); //读取DataBlock的基地址
var dataPointer = headdata.ReadInt(blockindex * 8); //读取DataBlock的相对地址
//var dataPointerbase = headdata.ReadLong(blockindex * 12 + 4); //读取DataBlock的基地址
if (dataPointer > 0)
{
////var datasize = datafile.ReadInt(dataPointer); //读取DataBlock 的大小
//var vmm = GetDataMemory(datafile, dataPointerbase, dataPointer);
//说明数据没有采用Zip压缩，可以直接读取使用
var dp = dataPointer;
int datasize = 0;
int dataloc = 0;
if (dp >= mbufferadderss && (dp - mbufferadderss + 4) <= bufferLen && (dp - mbufferadderss + 4 + MemoryHelper.ReadInt32(mdataBuffer, dp - mbufferadderss)) <= bufferLen)
{
datasize = MemoryHelper.ReadInt32(mdataBuffer, dp - mbufferadderss);
dataloc = (int)(dp - mbufferadderss + 4);
}
else
{
bufferLen = datafile.Read(mdataBuffer, dp, buffersize);
mbufferadderss = dp;
datasize = MemoryHelper.ReadInt32(mdataBuffer, 0);
dataloc = (int)(dp - mbufferadderss + 4);
}
if (datasize > 0 && (mLastBuffer != mbufferadderss || mLastDataLoc != dataloc || mLastDataSize != datasize))
{
vmm = new MarshalMemoryBlock(datasize, datasize);
MemoryHelper.MemoryCopy(mdataBuffer, dataloc, vmm.Buffers[0], 0, datasize);
mLastBuffer = mbufferadderss;
mLastDataLoc = dataloc;
mLastDataSize = datasize;
}
else if (datasize <= 0)
{
vmm = null;
}
if (vmm != null)
{
if (!rtmp.ContainsKey(dataPointer))
{
//var rmm = datafile.Read(dataPointer + 4, datasize);
if (!re.ContainsKey(vmm))
{
re.Add(vmm, new Tuple <List <DateTime>, int>(new List <DateTime>()
{
vdd
}, blockindex));
}
else
{
re[vmm].Item1.Add(vdd);
}
rtmp.Add(dataPointer, vmm);
}
else
{
//var rmm = rtmp[dataPointer];
if (!re.ContainsKey(vmm))
{
re.Add(vmm, new Tuple <List <DateTime>, int>(new List <DateTime>()
{
vdd
}, blockindex));
}
else
{
re[vmm].Item1.Add(vdd);
}
}
}
}
}
headdata.Dispose();
Marshal.FreeHGlobal(mdataBuffer);
return(re);
}
