public void CreateModifiedInodes()
{
if (ModifiedInodes != null)
{
return;
}
ModifiedInodes = new List <BbInode>();
foreach (var node in MainFsInodes)
{
var newNode = new BbInode();
ModifiedInodes.Add(newNode.Copy(node));
}
ModifiedAllocTable = new List <short>();
foreach (var alloc in MainFsAllocTable)
{
ModifiedAllocTable.Add(alloc);
}
var newSeqNo = MainFs.SeqNo + 1;
MainFs = new BbFat16();
MainFs.Magic = MAGIC_BBFS;
MainFs.SeqNo = newSeqNo;
MainFs.Link = 0;
MainFs.CheckSum = 0;
FsHeaders.Add(MainFs);
FsInodes.Add(ModifiedInodes);
FsAllocationTables.Add(ModifiedAllocTable);
MainFsIndex = FsHeaders.Count - 1;
}
public bool FileWrite(string fileName, byte[] fileData, ref BbInode newNode)
{
newNode = new BbInode();
newNode.NameString = fileName;
newNode.Type = 1;
newNode.Size = (uint)fileData.Length;
// remove any existing file with this name
FileDelete(newNode.NameString);
// make sure we have a modified inodes collection ready...
CreateModifiedInodes();
int numBlocks = (fileData.Length + (BLOCK_SZ - 1)) / BLOCK_SZ;
var blockList = TryAllocateBlocks(numBlocks);
if (blockList == null)
{
return(false); // couldn't find enough unused blocks :(
}
// start writing the file data!
for (int i = 0; i < numBlocks; i++)
{
int dataOffset = i * BLOCK_SZ;
int numWrite = BLOCK_SZ;
if (dataOffset + numWrite > fileData.Length)
{
numWrite = fileData.Length % BLOCK_SZ;
}
SeekToBlock(blockList[i]);
io.Stream.Write(fileData, dataOffset, numWrite);
}
newNode.BlockIdx = blockList[0];
// add new inode to inode list...
// make seperate inode to provided one, to make sure nothing can change after adding it to inode list
var realNewNode = new BbInode();
realNewNode.Copy(newNode);
ModifiedInodes.Add(realNewNode);
var chain = GetBlockChain(newNode.BlockIdx);
// success!
return(true);
}