internal Header(RRDFile file)
{
if (file.ReadString(4) != Constants.COOKIE)
{
throw new IOException("Invalid COOKIE");
}
Version = file.ReadString(5);
IntVersion = int.Parse(Version);
if (IntVersion > 3)
{
throw new IOException("Unsupported RRD version (" + Version + ")");
}
file.Align();
// Consume the FLOAT_COOKIE
file.ReadDouble();
DataSourceCount = file.ReadInt();
ArchiveCount = file.ReadInt();
PrimaryDataPointStep = file.ReadInt();
// Skip rest of stat_head_t.par
file.Align();
file.SkipBytes(80);
size = file.FilePointer - offset;
}
public void testReadInt64BitBigEndian(){
string tempFile = Path.GetTempFileName();
try
{
using (FileStream outputStream = File.OpenWrite(tempFile))
{
write64BitBigEndianHeaderToFloatCookie(outputStream);
//Write out 3 integers (the rest of the normal header), each 64 bits, in little endian format.
//However, we're expecting only an int (32-bits) back, so the value we're expecting from a
// big-endian file is the *last* four bytes only. The first four bytes are ignored.
//We write them with real possibly mis-interpretable numbers though, to double check
//that it's reading correctly
byte[] int1 = { 0x77, 0x66, 0x55, 0x44, 0x78, 0x56, 0x34, 0x12};
byte[] int2 = { 0x77, 0x66, 0x55, 0x44, 0x12, 0x34, 0x56, 0x78};
byte[] int3 = { 0x77, 0x66, 0x55, 0x44, 0x78, 0x12, 0x56, 0x34};
outputStream.Write(int1,0,8);
outputStream.Write(int2,0,8);
outputStream.Write(int3,0,8);
}
using(RRDFile rrdFile = new RRDFile(tempFile))
{
rrdFile.SkipBytes(24); //Skip the string cookie, version, padding, and float cookie
Assert.AreEqual(0x78563412, rrdFile.ReadInt());
Assert.AreEqual(0x12345678, rrdFile.ReadInt());
Assert.AreEqual(0x78125634, rrdFile.ReadInt());
}
}
finally
{
try
{
File.Delete(tempFile);
}
catch (Exception)
{
}
}
}
public void testReadInt64BitLittleEndian(){
string tempFile = Path.GetTempFileName();
try
{
using (FileStream outputStream = File.OpenWrite(tempFile))
{
write64BitLittleEndianHeaderToFloatCookie(outputStream);
//Write out 3 integers (the rest of the normal header), each 32 bits, in little endian format.
byte[] int1 = {0x12, 0x34, 0x56, 0x78, 0x77, 0x66, 0x55, 0x44}; //Gives the integer 0x78563412 in little endian
byte[] int2 = {0x78, 0x56, 0x34, 0x12, 0x77, 0x66, 0x55, 0x44}; //Gives the integer 0x12345678 in little endian
byte[] int3 = {0x34, 0x12, 0x78, 0x56, 0x77, 0x66, 0x55, 0x44}; //Gives the integer 0x56781234 in little endian
outputStream.Write(int1,0,8);
outputStream.Write(int2,0,8);
outputStream.Write(int3,0,8);
}
using(RRDFile rrdFile = new RRDFile(tempFile))
{
rrdFile.SkipBytes(24); //Skip the string cookie, version, padding, and float cookie
Assert.AreEqual(0x78563412, rrdFile.ReadInt());
Assert.AreEqual(0x12345678, rrdFile.ReadInt());
Assert.AreEqual(0x56781234, rrdFile.ReadInt());
}
}
finally
{
try
{
File.Delete(tempFile);
}
catch (Exception)
{
}
}
}
internal void LoadData(RRDFile file, int dsCount)
{
dataOffset = file.FilePointer;
// Skip over the data to position ourselves at the start of the next archive
file.SkipBytes(8*RowCount*dsCount);
}