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Diffstat (limited to 'source/smbd/predict.c')
-rw-r--r-- | source/smbd/predict.c | 145 |
1 files changed, 0 insertions, 145 deletions
diff --git a/source/smbd/predict.c b/source/smbd/predict.c deleted file mode 100644 index 691d8fbb4e0..00000000000 --- a/source/smbd/predict.c +++ /dev/null @@ -1,145 +0,0 @@ -/* - Unix SMB/Netbios implementation. - Version 1.9. - file read prediction routines - Copyright (C) Andrew Tridgell 1992-1997 - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. -*/ - -#include "includes.h" - -extern int DEBUGLEVEL; - - -/* variables used by the read prediction module */ -static int rp_fd = -1; -static int rp_offset = 0; -static int rp_length = 0; -static int rp_alloced = 0; -static int rp_predict_fd = -1; -static int rp_predict_offset = 0; -static int rp_predict_length = 0; -static int rp_timeout = 5; -static time_t rp_time = 0; -static char *rp_buffer = NULL; -static BOOL predict_skip=False; -time_t smb_last_time=(time_t)0; - -/**************************************************************************** -handle read prediction on a file -****************************************************************************/ -int read_predict(int fd,int offset,char *buf,char **ptr,int num) -{ - int ret = 0; - int possible = rp_length - (offset - rp_offset); - - possible = MIN(possible,num); - - /* give data if possible */ - if (fd == rp_fd && - offset >= rp_offset && - possible>0 && - smb_last_time-rp_time < rp_timeout) - { - ret = possible; - if (buf) - memcpy(buf,rp_buffer + (offset-rp_offset),possible); - else - *ptr = rp_buffer + (offset-rp_offset); - DEBUG(5,("read-prediction gave %d bytes of %d\n",ret,num)); - } - - if (ret == num) { - predict_skip = True; - } else { - predict_skip = False; - - /* prepare the next prediction */ - rp_predict_fd = fd; - rp_predict_offset = offset + num; - rp_predict_length = num; - } - - if (ret < 0) ret = 0; - - return(ret); -} - -/**************************************************************************** -pre-read some data -****************************************************************************/ -void do_read_prediction() -{ - static int readsize = 0; - - if (predict_skip) return; - - if (rp_predict_fd == -1) - return; - - rp_fd = rp_predict_fd; - rp_offset = rp_predict_offset; - rp_length = 0; - - rp_predict_fd = -1; - - if (readsize == 0) { - readsize = lp_readsize(); - readsize = MAX(readsize,1024); - } - - rp_predict_length = MIN(rp_predict_length,2*readsize); - rp_predict_length = MAX(rp_predict_length,1024); - rp_offset = (rp_offset/1024)*1024; - rp_predict_length = (rp_predict_length/1024)*1024; - - if (rp_predict_length > rp_alloced) - { - rp_buffer = Realloc(rp_buffer,rp_predict_length); - rp_alloced = rp_predict_length; - if (!rp_buffer) - { - DEBUG(0,("can't allocate read-prediction buffer\n")); - rp_predict_fd = -1; - rp_fd = -1; - rp_alloced = 0; - return; - } - } - - if (lseek(rp_fd,rp_offset,SEEK_SET) != rp_offset) { - rp_fd = -1; - rp_predict_fd = -1; - return; - } - - rp_length = read(rp_fd,rp_buffer,rp_predict_length); - rp_time = time(NULL); - if (rp_length < 0) - rp_length = 0; -} - -/**************************************************************************** -invalidate read-prediction on a fd -****************************************************************************/ -void invalidate_read_prediction(int fd) -{ - if (rp_fd == fd) - rp_fd = -1; - if (rp_predict_fd == fd) - rp_predict_fd = -1; -} - |