public static IFileChunkHelper GetInstance(string path)
{
if (helpers == null)
{
InitHelpers();
}
IFileChunkHelper rv = null;
if (path != null)
{
string ext = System.IO.Path.GetExtension(path);
if (ext != null)
{
foreach (IFileChunkHelper ch in helpers)
{
if (ch.Supports(ext))
{
rv = ch;
break;
}
}
}
}
return(rv);
}
// add a file to the configuration, with running chunk sizes if set
public bool add(string fileName)
{
lock (myLock)
{
FileInfo fi = new FileInfo(fileName);
long fsize = fi.Length;
long deductible = ((totalBytes + deductedBytes) % chunkSize);
// don't make a too-small first chunk
if (deductible > ((1.0 - this.Config.MinimumChunk) * chunkSize))
{
deductedBytes += (chunkSize - deductible);
deductible = 0;
}
//// dont make a too-small last chunk ??????? [the calc is wrong, but so is the concept... doing this leads to possible very-short fills]
//else if ((fsize + deductible) % chunkSize < (this.Config.MinimumChunk * chunkSize))
//{
// deductedBytes += deductible;
// deductible = 0;
//}
chunks = (int)((deductible + fsize) / chunkSize);
if (((chunks * chunkSize) - deductible) < fsize)
{
chunks += 1;
}
debug("exposing file " + fileName + " in chunks of " + chunkSize + "(total of " + chunks + ")");
for (int i = 0; i < chunks; i++)
{
long offset = (i * chunkSize) - deductible;
long length;
if (i == 0)
{
offset = 0;
length = chunkSize - deductible;
if (length > fsize)
{
length = fsize;
}
}
else if (i + 1 == chunks)
{
length = (fsize + deductible) - (i * chunkSize);
}
else
{
length = chunkSize;
}
if (Config.UseExtension && Config.SmartChunk && i + 1 < chunks)
{
IFileChunkHelper ifh = FileChunkHelperFactory.GetInstance(fileName);
if (ifh != null)
{
long suggested = (ifh.LocateChunkEndPoint(fileName, offset + length));
if (suggested < (offset + length))
{
long delta = (offset + length) - suggested;
length -= delta;
deductible += delta;
deductedBytes += delta;
}
}
}
Chunk c = new Chunk(fileName, offset, length, i + 1, chunks, Config.UseExtension);
MyDirectory.Add(c.getFileName(), c);
orderedChunks.Add(c);
//if (currentSubdir != null) currentSubdir.Add(c);
addToSubdir(c);
debug("chunk added: " + c.getFileName());
totalBytes += c.LogicalLength;
}
return(chunks >= 1);
}
}
