int ext2::Write(FileDescriptorBase *fileDescriptor, void *buff, uint numBytes)
{
if(numBytes == 0)
return(0);
FileDescriptor *tmpDescriptor = reinterpret_cast<FileDescriptor*>(fileDescriptor);
uint bytesWritten = 0;
int amt;
while(numBytes > bytesWritten)
{
amt = MIN(blockSize - tmpDescriptor->blockPosition, numBytes - bytesWritten);
// copy in the current block
MemCopy(tmpDescriptor->blockData + tmpDescriptor->blockPosition, reinterpret_cast<uchar*>(buff) + bytesWritten, amt);
// write this block to the disk
WriteDataBlock(tmpDescriptor->blockNumber, tmpDescriptor, tmpDescriptor->blockData);
// update the positions
tmpDescriptor->blockPosition += amt;
tmpDescriptor->filePosition += amt;
if(tmpDescriptor->filePosition > tmpDescriptor->fileInode.size)
tmpDescriptor->fileInode.size = tmpDescriptor->filePosition;
// we're done with this block and their's another to read in
if(tmpDescriptor->blockPosition == blockSize &&
tmpDescriptor->filePosition < tmpDescriptor->fileInode.size)
{
ReadDataBlock(++tmpDescriptor->blockNumber, tmpDescriptor->fileInode.blockPointers, tmpDescriptor->blockData);
tmpDescriptor->blockPosition = 0;
}
// we're at the end of the block and the file
else if(tmpDescriptor->blockPosition == blockSize &&
tmpDescriptor->filePosition == tmpDescriptor->fileInode.size)
{
MemSet(tmpDescriptor->blockData, 0, blockSize); // set the block to all zeros
tmpDescriptor->blockPosition = 0; // reset the block position
++tmpDescriptor->blockNumber; // increase the block number
}
bytesWritten += amt;
}
return bytesWritten;
}
// Write a RECT to the ini file
BOOL CIni::WriteRect(LPCTSTR lpSection, LPCTSTR lpKey, RECT rc) const
{
return WriteDataBlock(lpSection, lpKey, &rc, sizeof(RECT));
}
// Write a POINT to the ini file
BOOL CIni::WritePoint(LPCTSTR lpSection, LPCTSTR lpKey, POINT pt) const
{
return WriteDataBlock(lpSection, lpKey, &pt, sizeof(POINT));
}