curlftpfs fails when using with ntfsclone

curlftpfs is really a nice program. I love it.
However, when I tried to dump file using ntfsclone, and save it in the directory mounted by curlftpfs, it fails.

This is how to reproduce the error:
A simple script to mount ftpfs by curlftpfs, mntcurlftpfs:
-----------------
#!/bin/bash
mode=$1
echo "Passwd ?"
read -s passwd
ftp_srv=192.168.120.254
ftpfs_dir=images
ocsroot=/mnt
user_pwd_pair="steven:$passwd"
[ -n "$mode" ] && opt="-d -v -o ftpfs_debug"
   curlftpfs ftp://$ftp_srv/$ftpfs_dir $ocsroot $opt -o direct_io,kernel_cache,nonempty,user=$user_pwd_pair
-----------------
First, mount the ftpfs with debug options:
./mntcurlftpfs debug

Make sure it's successful:
df | grep -i curlftpfs
curlftpfs            7999999992         0 7999999992   0% /mnt

Then I run:
dd if=/dev/hda1 of=/mnt/ntfs.dump

This is the results from dd:
----------------------------------
dd: writing to `/mnt/ntfs.dump': Software caused connection abort
dd: closing output file `/mnt/ntfs.dump': Transport endpoint is not connected

This is the console about the curlftpfs debug messages:
----------------------------------
...
WRITE[134845384] 512 bytes to 134215168
1185302566 ftpfs.c:799 ftpfs_write: 512 134215168
   WRITE[134845384] 512 bytes
   unique: 262145, error: 0 (Success), outsize: 24
unique: 262146, opcode: WRITE (16), nodeid: 2, insize: 576
WRITE[134845384] 512 bytes to 134215680
1185302566 ftpfs.c:799 ftpfs_write: 512 134215680
   WRITE[134845384] 512 bytes
   unique: 262146, error: 0 (Success), outsize: 24
unique: 262147, opcode: WRITE (16), nodeid: 2, insize: 576
WRITE[134845384] 512 bytes to 134216192
1185302566 ftpfs.c:799 ftpfs_write: 512 134216192
   WRITE[134845384] 512 bytes
   unique: 262147, error: 0 (Success), outsize: 24
unique: 262148, opcode: WRITE (16), nodeid: 2, insize: 576
WRITE[134845384] 512 bytes to 134216704
1185302566 ftpfs.c:799 ftpfs_write: 512 134216704
   WRITE[134845384] 512 bytes
   unique: 262148, error: 0 (Success), outsize: 24
unique: 262149, opcode: WRITE (16), nodeid: 2, insize: 576
WRITE[134845384] 512 bytes to 134217216
1185302566 ftpfs.c:799 ftpfs_write: 512 134217216
ftpfs: memory allocation failed
----------

Besides, I tried with ntfsclone:
ntfsclone --save-image --overwrite /mnt/ntfsclone.dump /dev/hda1

This is the results from ntfsclone:
----------------------------------
ntfsclone v1.13.1 (libntfs 9:0:0)
NTFS volume version: 3.1
Cluster size       : 4096 bytes
Current volume size: 8578932736 bytes (8579 MB)
Current device size: 8578934784 bytes (8579 MB)
Scanning volume ...
100.00 percent completed
Accounting clusters ...
Space in use       : 1884 MB (22.0%)  
Saving NTFS to image ...
ERROR(103): Write failed: Software caused connection abort
----------------------------------

This is the console about the curlftpfs debug messages:
----------------------------------
...
WRITE[134848104] 1 bytes to 134234406
1185302081 ftpfs.c:799 ftpfs_write: 1 134234406
   WRITE[134848104] 1 bytes
   unique: 65565, error: 0 (Success), outsize: 24
unique: 65566, opcode: WRITE (16), nodeid: 2, insize: 4160
WRITE[134848104] 4096 bytes to 134234407
1185302081 ftpfs.c:799 ftpfs_write: 4096 134234407
   WRITE[134848104] 4096 bytes
   unique: 65566, error: 0 (Success), outsize: 24
unique: 65567, opcode: WRITE (16), nodeid: 2, insize: 65
WRITE[134848104] 1 bytes to 134238503
1185302081 ftpfs.c:799 ftpfs_write: 1 134238503
   WRITE[134848104] 1 bytes
   unique: 65567, error: 0 (Success), outsize: 24
unique: 65568, opcode: WRITE (16), nodeid: 2, insize: 4160
WRITE[134848104] 4096 bytes to 134238504
1185302081 ftpfs.c:799 ftpfs_write: 4096 134238504
ftpfs: memory allocation failed
----------

Looks like it's the memory problem. Actually this problem occurs in those similar programs, like dd, ntfsclone and partimage.
Any plan to fix that ?

BTW, it would be a good idea to provide an option "--interactive-password" with curlftpfs, so the password won't be explicit.
Thanks.