public void setResistance(double percentage)
{
CurrentResistance = percentage;
var crc32 = new Crc32.Crc32Algorithm(0xedb88320u,
0xffffffffu);
byte[] output = new byte[13];
output[0] = 0x4A; // Sync bit;
output[1] = 0x09; // Message Length
output[2] = 0x4E; // Message type
output[3] = 0x05; // Message type
output[4] = 0x30; // Data Type
output[11] = (byte)(percentage * 2);
output[12] = (byte)BitConverter.ToInt32(crc32.ComputeHash(output), 0);
bleBike.WriteCharacteristic("6e40fec3-b5a3-f393-e0a9-e50e24dcca9e", output);
}
/// <summary>
/// Adds a file (already in memory) to a vpk.
/// </summary>
/// <param name="contents">The file contents.</param>
/// <param name="internalfilename">The file name, including path, internally.</param>
public void AddFile(byte[] contents, string internalfilename)
{
Crc32.Crc32Algorithm checker = new Crc32.Crc32Algorithm();
byte[] crc = checker.ComputeHash(contents);
if (crc.Length != 4)
{
Console.WriteLine("wtf the crc isn't 32 bits long");
}
VPKFile asfile = new VPKFile(null);
asfile.CRC32 = BitConverter.ToUInt32(crc, 0);
asfile.entry_length = (uint)(contents.Length);
// Now that we have the basics of the file, we need to figure out how to store it
// This involves first loading the vpk directory information
List <VPKExt> dir = GetDirectory();
// Now we need to just add the file, and write new directory information
// Get the location to which to write the file
Tuple <int, uint> slot = GetNewestSpace(dir);
int paddinglength = (int)filealignment - (int)((int)(slot.Item2) % (int)filealignment);
int archivenum = slot.Item1;
uint offset = slot.Item2;
// Create a new archive file if necessary
if (contents.Length + slot.Item2 + paddinglength > maxarchivesize)
{
paddinglength = 0;
archivenum++;
offset = 0;
}
// Write the file to the archive
using (FileStream foo = File.OpenWrite(String.Format("{0}_{1:D3}.vpk", fileprefix, archivenum)))
{
using (BinaryWriter bw = new BinaryWriter(foo))
{
bw.Seek((int)offset, SeekOrigin.Begin);
for (int i = 0; i < paddinglength; i++)
{
bw.Write((byte)0);
}
bw.Write(contents);
}
}
// Add the padding to the offset so it properly reflects the file
offset += (uint)paddinglength;
// Add the file information to the directory
string ext = internalfilename.Substring(internalfilename.IndexOf('.') + 1);
internalfilename = internalfilename.Substring(0, internalfilename.IndexOf('.'));
char[] lookfor = { '\\', '/' };
string path = internalfilename.Substring(0, internalfilename.LastIndexOfAny(lookfor));
string name = internalfilename.Substring(internalfilename.LastIndexOfAny(lookfor) + 1);
// Find where to put it
VPKExt writeext = null;
foreach (VPKExt vext in dir)
{
if (vext.ext == ext)
{
writeext = vext;
}
}
if (writeext == null)
{
writeext = new VPKExt();
writeext.ext = ext;
writeext.directories = new List <VPKDirectory>();
dir.Add(writeext);
}
VPKDirectory writedir = null;
foreach (VPKDirectory vpkd in writeext.directories)
{
if (vpkd.path == path)
{
writedir = vpkd;
}
}
if (writedir == null)
{
writedir = new VPKDirectory();
writedir.path = path;
writedir.ext = ext;
writedir.entries = new List <VPKFileEntry>();
writeext.directories.Add(writedir);
}
VPKFileEntry writefile = null;
foreach (VPKFileEntry vpkfe in writedir.entries)
{
if (vpkfe.name == name)
{
writefile = vpkfe;
//ok, we gotta do a file replacement
//thankfully, this is just overwriting a few values
writefile.body.archive_index = (ushort)archivenum;
writefile.body.CRC32 = BitConverter.ToUInt32(crc, 0);
writefile.body.entry_length = (uint)(contents.Length);
writefile.body.entry_offset = offset;
writefile.body.preload_bytes = 0;
}
}
if (writefile == null)
{
// Didn't find a file entry, so let's add one
writefile = new VPKFileEntry();
writefile.body.archive_index = (ushort)archivenum;
writefile.body.CRC32 = BitConverter.ToUInt32(crc, 0);
writefile.body.entry_length = (uint)(contents.Length);
writefile.body.entry_offset = offset;
writefile.body.preload_bytes = 0;
writedir.entries.Add(writefile);
}
// Write the new directory to the directory file.
WriteDirectory(dir);
}
