public static string RemoveAllChunksFromFile(FileStream fs, byte[] chunkToRemove)
{
int bytesRead;
long currentReadOffset = 0;
long totalBytesRead = 0;
int maxReadSize = 0;
long currentChunkSize;
byte[] bytes = new byte[Constants.FileReadChunkSize];
long[] offsets = ParseFile.GetAllOffsets(fs, 0, chunkToRemove, false, -1, -1, true);
string destinationPath = Path.ChangeExtension(fs.Name, ".cut");
using (FileStream destinationFs = File.OpenWrite(destinationPath))
{
for (int i = 0; i < offsets.Length; i++)
{
// move position
fs.Position = currentReadOffset;
// get length of current size to write
currentChunkSize = offsets[i] - currentReadOffset;
// calculcate max cut size for this loop iteration
maxReadSize = (currentChunkSize - totalBytesRead) > (long)bytes.Length ? bytes.Length : (int)(currentChunkSize - totalBytesRead);
while ((bytesRead = fs.Read(bytes, 0, maxReadSize)) > 0)
{
destinationFs.Write(bytes, 0, bytesRead);
totalBytesRead += (long)bytesRead;
maxReadSize = (currentChunkSize - totalBytesRead) > (long)bytes.Length ? bytes.Length : (int)(currentChunkSize - totalBytesRead);
}
totalBytesRead = 0;
currentReadOffset = offsets[i] + chunkToRemove.Length;
}
////////////////////////////
// write remainder of file
////////////////////////////
// move position
fs.Position = currentReadOffset;
// get length of current size to write
currentChunkSize = fs.Length - currentReadOffset;
// calculcate max cut size
maxReadSize = (currentChunkSize - totalBytesRead) > (long)bytes.Length ? bytes.Length : (int)(currentChunkSize - totalBytesRead);
while ((bytesRead = fs.Read(bytes, 0, maxReadSize)) > 0)
{
destinationFs.Write(bytes, 0, bytesRead);
totalBytesRead += (long)bytesRead;
maxReadSize = (currentChunkSize - totalBytesRead) > (long)bytes.Length ? bytes.Length : (int)(currentChunkSize - totalBytesRead);
}
}
return(destinationPath);
}