lmdb: iterate_range implementation
[sfrench/samba-autobuild/.git] / source4 / libcli / clireadwrite.c
1 /* 
2    Unix SMB/CIFS implementation.
3    client file read/write routines
4    Copyright (C) Andrew Tridgell 1994-1998
5    Copyright (C) James Myers 2003
6    
7    This program is free software; you can redistribute it and/or modify
8    it under the terms of the GNU General Public License as published by
9    the Free Software Foundation; either version 3 of the License, or
10    (at your option) any later version.
11    
12    This program is distributed in the hope that it will be useful,
13    but WITHOUT ANY WARRANTY; without even the implied warranty of
14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15    GNU General Public License for more details.
16    
17    You should have received a copy of the GNU General Public License
18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include "includes.h"
22 #include "libcli/raw/libcliraw.h"
23 #include "libcli/raw/raw_proto.h"
24 #include "libcli/libcli.h"
25
26 /****************************************************************************
27   Read size bytes at offset offset using SMBreadX.
28 ****************************************************************************/
29 ssize_t smbcli_read(struct smbcli_tree *tree, int fnum, void *_buf, off_t offset, 
30                  size_t size)
31 {
32         uint8_t *buf = (uint8_t *)_buf;
33         union smb_read parms;
34         int readsize;
35         ssize_t total = 0;
36         
37         if (size == 0) {
38                 return 0;
39         }
40
41         parms.readx.level = RAW_READ_READX;
42         parms.readx.in.file.fnum = fnum;
43
44         /*
45          * Set readsize to the maximum size we can handle in one readX,
46          * rounded down to a multiple of 1024.
47          */
48         readsize = (tree->session->transport->negotiate.max_xmit - (MIN_SMB_SIZE+32));
49         if (readsize > 0xFFFF) readsize = 0xFFFF;
50
51         while (total < size) {
52                 NTSTATUS status;
53
54                 readsize = MIN(readsize, size-total);
55
56                 parms.readx.in.offset    = offset;
57                 parms.readx.in.mincnt    = readsize;
58                 parms.readx.in.maxcnt    = readsize;
59                 parms.readx.in.remaining = size - total;
60                 parms.readx.in.read_for_execute = false;
61                 parms.readx.out.data     = buf + total;
62                 
63                 status = smb_raw_read(tree, &parms);
64                 
65                 if (!NT_STATUS_IS_OK(status)) {
66                         return -1;
67                 }
68
69                 total += parms.readx.out.nread;
70                 offset += parms.readx.out.nread;
71
72                 /* If the server returned less than we asked for we're at EOF */
73                 if (parms.readx.out.nread < readsize)
74                         break;
75         }
76
77         return total;
78 }
79
80
81 /****************************************************************************
82   write to a file
83   write_mode: 0x0001 disallow write cacheing
84               0x0002 return bytes remaining
85               0x0004 use raw named pipe protocol
86               0x0008 start of message mode named pipe protocol
87 ****************************************************************************/
88 ssize_t smbcli_write(struct smbcli_tree *tree,
89                      int fnum, uint16_t write_mode,
90                      const void *_buf, off_t offset, size_t size)
91 {
92         const uint8_t *buf = (const uint8_t *)_buf;
93         union smb_write parms;
94         int block = (tree->session->transport->negotiate.max_xmit - (MIN_SMB_SIZE+32));
95         ssize_t total = 0;
96
97         if (size == 0) {
98                 return 0;
99         }
100
101         if (block > 0xFFFF) block = 0xFFFF;
102
103
104         parms.writex.level = RAW_WRITE_WRITEX;
105         parms.writex.in.file.fnum = fnum;
106         parms.writex.in.wmode = write_mode;
107         parms.writex.in.remaining = 0;
108
109         do {
110                 NTSTATUS status;
111
112                 block = MIN(block, size - total);
113
114                 parms.writex.in.offset = offset;
115                 parms.writex.in.count = block;
116                 parms.writex.in.data = buf;
117
118                 status = smb_raw_write(tree, &parms);
119
120                 if (!NT_STATUS_IS_OK(status)) {
121                         return -1;
122                 }
123
124                 offset += parms.writex.out.nwritten;
125                 total += parms.writex.out.nwritten;
126                 buf += parms.writex.out.nwritten;
127         } while (total < size);
128
129         return total;
130 }
131
132 /****************************************************************************
133   write to a file using a SMBwrite and not bypassing 0 byte writes
134 ****************************************************************************/
135 ssize_t smbcli_smbwrite(struct smbcli_tree *tree,
136                      int fnum, const void *_buf, off_t offset, size_t size1)
137 {
138         const uint8_t *buf = (const uint8_t *)_buf;
139         union smb_write parms;
140         ssize_t total = 0;
141
142         parms.write.level = RAW_WRITE_WRITE;
143         parms.write.in.remaining = 0;
144         
145         do {
146                 size_t size = MIN(size1, tree->session->transport->negotiate.max_xmit - 48);
147                 if (size > 0xFFFF) size = 0xFFFF;
148                 
149                 parms.write.in.file.fnum = fnum;
150                 parms.write.in.offset = offset;
151                 parms.write.in.count = size;
152                 parms.write.in.data = buf + total;
153
154                 if (NT_STATUS_IS_ERR(smb_raw_write(tree, &parms)))
155                         return -1;
156
157                 size = parms.write.out.nwritten;
158                 if (size == 0)
159                         break;
160
161                 size1 -= size;
162                 total += size;
163                 offset += size;
164         } while (size1);
165
166         return total;
167 }