We use imapd( UNIX driver ) and our client program code is following [Client code
example].
If a message consists of 100 bodies and message size is 20M bytes, then read() called
100 times.
Why?
For every mail_fetch_body() call for one message, the imapd calls stream->dtb->text()
( i.e. unix_text() ).
unix_text_work() ( from unix_work() ) calls read() with full message text size.
Totally, 20M*100times = 2GB read() is requested. !!!
I made a temporary patch for fix this problem. ( Please, check [My temporary patch for
unix.c & unix.h] )
I think this is not correct solution, but to show my idea. ;-)
Thanks for reading.
------------------- [ Client code example ] ----------------------------
int fetch_body_contents( BODY *body, char *pfx )
{
mail_fetch_body( body, pfx, ... )
}
int fetch_body( BODY *body, char *pfx, long i )
{
char tmp[MAILTMPLEN];
if ( body->type == TYPEMULTIPART )
{
if ( pfx ) /* if not first time, extend prefix */
sprintf( tmp,"%s%ld.", pfx, ++i );
else
tmp[0] = '\0';
for ( i = 0, part = body->nested.part ; part ; part = part->next )
{
if ( !fetch_body( &part->body, tmp, i++ ) )
return -1;
}
return 1;
}
else /* non-multipart */
{
if ( !pfx ) /* dummy prefix if top level */
pfx = "";
sprintf( tmp, "%s%ld", pfx, ++i );
if ( fetch_body_contents( body, tmp ) < 0 )
return -1;
/* encapsulated message? */
if ( (body->type == TYPEMESSAGE) &&
(body->subtype[0] == 'R' &&
body->subtype[1] == 'F' &&
body->subtype[2] == 'C' &&
body->subtype[3] == '8' &&
body->subtype[4] == '2' &&
body->subtype[5] == '2' &&
body->subtype[6] == 0 ) &&
(body->nested.msg) &&
(body = body->nested.msg->body) )
(body = body->nested.msg->body) )
{
if ( body->type == TYPEMULTIPART )
{
return fetch_body( body, pfx, i-1 );
}
else /* build encapsulation prefix */
{
sprintf( tmp, "%s%ld.", pfx, i );
return fetch_body( body, tmp, (long)0 );
}
}
return 1;
}
}
int parse_mail()
{
int result;
mail_fetchstructure_full( ... )
result = fetch_body( body, "", 0 );
}
----------------- [ My temporary patch ] -----------------------
*** unix.c.orig Tue Dec 16 12:33:34 2003
--- unix.c Tue Dec 16 12:37:47 2003
***************
*** 558,563 ****
--- 558,580 ----
FDDATA d;
STRING bs;
char *s,*t,*tl,tmp[CHUNK];
+ char *_buf_;
+ int _buflen_;
+
+ if ( LOCAL->fullmsg != NIL &&
+ LOCAL->fullmsg_elt == elt &&
+ LOCAL->fullmsg_flags == (flags & FT_INTERNAL) ) {
+ *length = LOCAL->fullmsg_len;
+ return LOCAL->fullmsg;
+ }
+ fs_give( (void **)&LOCAL->fullmsg );
+ LOCAL->fullmsg_len = 0;
+ LOCAL->fullmsg_elt = NIL;
+ _buf_ = LOCAL->buf;
+ _buflen_ = LOCAL->buflen;
+ LOCAL->buflen = (flags & FT_INTERNAL) ? elt->private.msg.text.text.size :
+ elt->rfc822_size;
+ LOCAL->buf = fs_get( LOCAL->buflen+1 );
/* go to text position */
lseek (LOCAL->fd,elt->private.special.offset +
elt->private.msg.text.offset,L_SET);
***************
*** 602,608 ****
*s = '\0'; /* tie off buffer */
*length = s - LOCAL->buf; /* calculate length */
}
! return LOCAL->buf;
}
/* UNIX per-message modify flag
--- 619,631 ----
*s = '\0'; /* tie off buffer */
*length = s - LOCAL->buf; /* calculate length */
}
! LOCAL->fullmsg = LOCAL->buf;
! LOCAL->fullmsg_len = *length;
! LOCAL->fullmsg_elt = elt;
! LOCAL->fullmsg_flags = flags & FT_INTERNAL;
! LOCAL->buf = _buf_;
! LOCAL->buflen = _buflen_;
! return LOCAL->fullmsg;
}
/* UNIX per-message modify flag
***************
*** 1009,1014 ****
--- 1032,1038 ----
/* free local text buffers */
if (LOCAL->buf) fs_give ((void **) &LOCAL->buf);
if (LOCAL->line) fs_give ((void **) &LOCAL->line);
+ if (LOCAL->fullmsg) fs_give ((void **) &LOCAL->fullmsg);
/* nuke the local data */
fs_give ((void **) &stream->local);
stream->dtb = NIL; /* log out the DTB */
*** unix.h.orig Wed Oct 25 08:41:26 2000
--- unix.h Tue Dec 16 12:36:08 2003
***************
*** 168,173 ****
--- 168,177 ----
char *buf; /* temporary buffer */
unsigned long buflen; /* current size of temporary buffer */
char *line; /* returned line */
+ char *fullmsg;
+ unsigned long fullmsg_len;
+ void *fullmsg_elt;
+ long fullmsg_flags;
} UNIXLOCAL;
Choi, Sung-hoon
DreamWiz Inc. - Development Team/Manager
Major : Mail/Web/Network/System/Security
Phone : +82-2-3434-3541
MSN : [EMAIL PROTECTED]
WWW : http://my.dreamwiz.com/shoon/
E-mail: [EMAIL PROTECTED]
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