1 files changed, 138 insertions, 0 deletions
diff --git a/source/smbd/fileio.c b/source/smbd/fileio.c
new file mode 100644
index 00000000000..c7ffb6412dd
--- /dev/null
+++ b/source/smbd/fileio.c
@@ -0,0 +1,138 @@
+/* 
+   Unix SMB/Netbios implementation.
+   Version 1.9.
+   read/write to a files_struct
+   Copyright (C) Andrew Tridgell 1992-1998
+   
+   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;
+
+
+/****************************************************************************
+seek a file. Try to avoid the seek if possible
+****************************************************************************/
+
+SMB_OFF_T seek_file(files_struct *fsp,SMB_OFF_T pos)
+{
+  SMB_OFF_T offset = 0;
+  SMB_OFF_T seek_ret;
+
+  if (fsp->print_file && lp_postscript(fsp->conn->service))
+    offset = 3;
+
+  seek_ret = sys_lseek(fsp->fd_ptr->fd,pos+offset,SEEK_SET);
+
+  if((seek_ret == -1) || (seek_ret != pos+offset)) {
+    DEBUG(0,("seek_file: sys_lseek failed. Error was %s\n", strerror(errno) ));
+    fsp->pos = -1;
+    return -1;
+  }
+
+  fsp->pos = seek_ret - offset;
+
+  DEBUG(10,("seek_file: requested pos = %.0f, new pos = %.0f\n",
+        (double)(pos+offset), (double)fsp->pos ));
+
+  return(fsp->pos);
+}
+
+/****************************************************************************
+read from a file
+****************************************************************************/
+
+ssize_t read_file(files_struct *fsp,char *data,SMB_OFF_T pos,size_t n)
+{
+  ssize_t ret=0,readret;
+
+#if USE_READ_PREDICTION
+  if (!fsp->can_write) {
+    ret = read_predict(fsp->fd_ptr->fd,pos,data,NULL,n);
+
+    data += ret;
+    n -= ret;
+    pos += ret;
+  }
+#endif
+
+#if WITH_MMAP
+  if (fsp->mmap_ptr) {
+	  SMB_OFF_T num = (fsp->mmap_size > pos) ? (fsp->mmap_size - pos) : 0;
+	  num = MIN(n,num);
+	  if (num > 0) {
+		  memcpy(data,fsp->mmap_ptr+pos,num);
+		  data += num;
+		  pos += num;
+		  n -= num;
+		  ret += num;
+	  }
+  }
+#endif
+
+  if (seek_file(fsp,pos) == -1) {
+    DEBUG(3,("read_file: Failed to seek to %.0f\n",(double)pos));
+    return(ret);
+  }
+  
+  if (n > 0) {
+    readret = read(fsp->fd_ptr->fd,data,n);
+    if (readret > 0) ret += readret;
+  }
+
+  return(ret);
+}
+
+
+/****************************************************************************
+write to a file
+****************************************************************************/
+
+ssize_t write_file(files_struct *fsp,char *data,size_t n)
+{
+
+  if (!fsp->can_write) {
+    errno = EPERM;
+    return(0);
+  }
+
+  if (!fsp->modified) {
+    SMB_STRUCT_STAT st;
+    fsp->modified = True;
+    if (sys_fstat(fsp->fd_ptr->fd,&st) == 0) {
+      int dosmode = dos_mode(fsp->conn,fsp->fsp_name,&st);
+      if (MAP_ARCHIVE(fsp->conn) && !IS_DOS_ARCHIVE(dosmode)) {	
+        file_chmod(fsp->conn,fsp->fsp_name,dosmode | aARCH,&st);
+      }
+    }  
+  }
+
+  return(write_data(fsp->fd_ptr->fd,data,n));
+}
+
+
+/*******************************************************************
+sync a file
+********************************************************************/
+
+void sync_file(connection_struct *conn, files_struct *fsp)
+{
+#ifdef HAVE_FSYNC
+    if(lp_strict_sync(SNUM(conn)))
+      fsync(fsp->fd_ptr->fd);
+#endif
+}