public void extractDbHeaders()
{
Int32 nBytes;
//dbOffset = 0;
FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read);
BinaryReader br = new BinaryReader(fileStream);
try
{
for (int db = 0; db < dbCount; db++)
{
dbHeader[db] = new htbHeader();
dbHeader[db].date = br.ReadChars(26);
dbHeader[db].ldate = br.ReadInt32();//offset + 26);
dbHeader[db].cfg_file = br.ReadChars(14);
dbHeader[db].pro_file = br.ReadChars(14);
dbHeader[db].unused0 = br.ReadChars(52);
dbHeader[db].speed = br.ReadUInt32();// offset + 110);
dbHeader[db].alloc = br.ReadUInt32();
dbHeader[db].offset = br.ReadInt32(); // offset + 118);
dbHeader[db].period = br.ReadUInt32(); // GetULONG(fid, offset + 122);
dbHeader[db].extension = br.ReadUInt32(); // GetULONG(fid, offset + 126);
dbHeader[db].skip = br.ReadUInt16();// GetUSHORT(fid, offset + 130);
dbHeader[db].first_channel = br.ReadUInt16();// GetUSHORT(fid, offset + 132);
dbHeader[db].nchannels = br.ReadUInt16();// GetUSHORT(fid, offset + 134);
dbHeader[db].sweep_limit = br.ReadUInt16();// GetUSHORT(fid, offset + 136);
dbHeader[db].cancel_override = br.ReadUInt32();// GetULONG(fid, offset + 138);
dbHeader[db].func = br.ReadByte(); // GetUCHAR(fid, offset + 142);
br.ReadByte();
dbHeader[db].tag = br.ReadUInt16(); // GetUSHORT(fid, offset + 144);
//br.ReadByte();
dbHeader[db].npages = br.ReadUInt16(); //GetUSHORT(fid, offset + 146);
dbHeader[db].nsamples = br.ReadUInt32(); //GetULONG(fid, offset + 148);
dbHeader[db].samples_per_page = br.ReadUInt16(); //GetUSHORT(fid, offset + 152);
dbHeader[db].sweep = br.ReadUInt16();// GetUSHORT(fid, offset + 154);
dbHeader[db].next_page = br.ReadUInt16();// GetUSHORT(fid, offset + 156);
dbHeader[db].next_off = br.ReadUInt16();// GetUSHORT(fid, offset + 158);
dbHeader[db].title = br.ReadChars(80); // GetString(fid, offset + 160, 80);
dbHeader[db].speed_units = br.ReadUInt32(); // GetULONG(fid, offset + 240);
dbHeader[db].filler = br.ReadChars(268);
dbOffset[0] = 0;
for (int i = 1; i < db+1; i++)
{
dbOffset[db] = dbOffset[db] + (int)dbHeader[i - 1].alloc;
}
br.BaseStream.Position += dbHeader[db].alloc - dbHeader[db].size() + 1;
}
}
finally { br.Close(); fileStream.Close(); }
}
// ~htbFile (); //Destructor
// public int getHtbCount() { return (anyError() ? (-1) : dbCount); }
//public long getHtbOffset(int db) { return (anyError() || db >= dbCount ? (-1) : dbOffset[db]); }
//public long getHtbSize(int db) { return (anyError() || db >= dbCount ? (-1) : dbHeader[db].alloc - sizeof(htbHeader)); }
//public char getFileName(char str); //returns file name containing this database this
//note that enough memory is allocated to str pointer
//and caller is responsible for freeing this memory
// htbHeader &getHtbHeader ( htbHeader &header , int db ); //returns htbHeader of requested database
// const htbHeader &getHtbHeader ( int db ) { return dbHeader[db]; }; //overloaded function
//void getHtb(int db); //returns data included in a database, the caller is
//responsible for freeing the allocated memory
//Example : getHtb(0) returns first database in the file
//void getEpoch(int db, int epoch); //returns data includede in a database epoch, for average
//databases this is equal to htbFile::getHtb
//The caller is responsible for freeing allocated memory
//Example : getEpoch(0,0) returns first Epoch of the first database
// (int)HTB.getEpoch ( 3 , (int)HTB.getHtbHeader(3).sweep-1 ) returns
// the last epoch of 4th database number
//char errorString(Int32 errorNum); //returns error string associated with each error value
public int extractDbCount()
{
Int32 nBytes;
htbHeader htbheader = new htbHeader();
int num = 0;
Int32 offset = 0;
FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read);
BinaryReader br = new BinaryReader(fileStream);
try
{
while (true)
{
try
{
br.BaseStream.Position = offset + 114;
int n = br.ReadInt32();
offset += n;
num++;
}
catch { break;}
}
}
finally { br.Close(); fileStream.Close(); }
return num;
}
