what's diff -u GString GByteArray for gtk2?

[Kang Jeong-Hee <Keizi mail co kr>]

Hi.

inspecting cvs/gnome-vfs/http-method.c, I did face two diff types of storage;
GString and GByteArray.

http-method.c seems to use each for different purpose.
but I cannot understand what they're different to each other.
binary data of like \0 couldn't be that diff;
 GString now supports embedded nuls ('\0'), so can be used with binary data.
from http://developer.gnome.org/dotplan/porting/ar01s19.html

both struct aer similar.
GString:
struct _GString 
{ 
  gchar  *str; 
  gsize len; 
  gsize allocated_len; 
}; 
and
GByteArray:
struct _GByteArray 
{ 
  guint8 *data; 
  guint   len; 
};

someone distinguise them?

thx
kz