source3/modules/weird.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba module with developer tools
   4    Copyright (C) Andrew Tridgell 2001
   5    Copyright (C) Jelmer Vernooij 2002
   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
  23 static struct {
  24         char from;
  25         const char *to;
  26         int len;
  27 } weird_table[] = {
  28         {'q', "^q^", 3},
  29         {'Q', "^Q^", 3},
  30         {0, NULL}
  31 };
  32
  33 static size_t weird_pull(void *cd, const char **inbuf, size_t *inbytesleft,
  34                          char **outbuf, size_t *outbytesleft)
  35 {
  36         while (*inbytesleft >= 1 && *outbytesleft >= 2) {
  37                 int i;
  38                 int done = 0;
  39                 for (i=0;weird_table[i].from;i++) {
  40                         if (strncmp((*inbuf),
  41                                     weird_table[i].to,
  42                                     weird_table[i].len) == 0) {
  43                                 if (*inbytesleft < weird_table[i].len) {
  44                                         DEBUG(0,("ERROR: truncated weird string\n"));
  45                                         /* smb_panic("weird_pull"); */
  46
  47                                 } else {
  48                                         (*outbuf)[0] = weird_table[i].from;
  49                                         (*outbuf)[1] = 0;
  50                                         (*inbytesleft)  -= weird_table[i].len;
  51                                         (*outbytesleft) -= 2;
  52                                         (*inbuf)  += weird_table[i].len;
  53                                         (*outbuf) += 2;
  54                                         done = 1;
  55                                         break;
  56                                 }
  57                         }
  58                 }
  59                 if (done) continue;
  60                 (*outbuf)[0] = (*inbuf)[0];
  61                 (*outbuf)[1] = 0;
  62                 (*inbytesleft)  -= 1;
  63                 (*outbytesleft) -= 2;
  64                 (*inbuf)  += 1;
  65                 (*outbuf) += 2;
  66         }
  67
  68         if (*inbytesleft > 0) {
  69                 errno = E2BIG;
  70                 return -1;
  71         }
  72
  73         return 0;
  74 }
  75
  76 static size_t weird_push(void *cd, const char **inbuf, size_t *inbytesleft,
  77                          char **outbuf, size_t *outbytesleft)
  78 {
  79         int ir_count=0;
  80
  81         while (*inbytesleft >= 2 && *outbytesleft >= 1) {
  82                 int i;
  83                 int done=0;
  84                 for (i=0;weird_table[i].from;i++) {
  85                         if ((*inbuf)[0] == weird_table[i].from &&
  86                             (*inbuf)[1] == 0) {
  87                                 if (*outbytesleft < weird_table[i].len) {
  88                                         DEBUG(0,("No room for weird character\n"));
  89                                         /* smb_panic("weird_push"); */
  90                                 } else {
  91                                         memcpy(*outbuf, weird_table[i].to,
  92                                                weird_table[i].len);
  93                                         (*inbytesleft)  -= 2;
  94                                         (*outbytesleft) -= weird_table[i].len;
  95                                         (*inbuf)  += 2;
  96                                         (*outbuf) += weird_table[i].len;
  97                                         done = 1;
  98                                         break;
  99                                 }
 100                         }
 101                 }
 102                 if (done) continue;
 103
 104                 (*outbuf)[0] = (*inbuf)[0];
 105                 if ((*inbuf)[1]) ir_count++;
 106                 (*inbytesleft)  -= 2;
 107                 (*outbytesleft) -= 1;
 108                 (*inbuf)  += 2;
 109                 (*outbuf) += 1;
 110         }
 111
 112         if (*inbytesleft == 1) {
 113                 errno = EINVAL;
 114                 return -1;
 115         }
 116
 117         if (*inbytesleft > 1) {
 118                 errno = E2BIG;
 119                 return -1;
 120         }
 121
 122         return ir_count;
 123 }
 124
 125 struct charset_functions weird_functions = {"WEIRD", weird_pull, weird_push};
 126
 127 NTSTATUS charset_weird_init(void);
 128 NTSTATUS charset_weird_init(void)
 129 {
 130         return smb_register_charset(&weird_functions);
 131 }