source/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 2 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, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 static struct {
  25         char from;
  26         char *to;
  27         int len;
  28 } weird_table[] = {
  29         {'q', "^q^", 3},
  30         {'Q', "^Q^", 3},
  31         {0, NULL}
  32 };
  33
  34 static size_t weird_pull(void *cd, const char **inbuf, size_t *inbytesleft,
  35                          char **outbuf, size_t *outbytesleft)
  36 {
  37         while (*inbytesleft >= 1 && *outbytesleft >= 2) {
  38                 int i;
  39                 int done = 0;
  40                 for (i=0;weird_table[i].from;i++) {
  41                         if (strncmp((*inbuf),
  42                                     weird_table[i].to,
  43                                     weird_table[i].len) == 0) {
  44                                 if (*inbytesleft < weird_table[i].len) {
  45                                         DEBUG(0,("ERROR: truncated weird string\n"));
  46                                         /* smb_panic("weird_pull"); */
  47
  48                                 } else {
  49                                         (*outbuf)[0] = weird_table[i].from;
  50                                         (*outbuf)[1] = 0;
  51                                         (*inbytesleft)  -= weird_table[i].len;
  52                                         (*outbytesleft) -= 2;
  53                                         (*inbuf)  += weird_table[i].len;
  54                                         (*outbuf) += 2;
  55                                         done = 1;
  56                                         break;
  57                                 }
  58                         }
  59                 }
  60                 if (done) continue;
  61                 (*outbuf)[0] = (*inbuf)[0];
  62                 (*outbuf)[1] = 0;
  63                 (*inbytesleft)  -= 1;
  64                 (*outbytesleft) -= 2;
  65                 (*inbuf)  += 1;
  66                 (*outbuf) += 2;
  67         }
  68
  69         if (*inbytesleft > 0) {
  70                 errno = E2BIG;
  71                 return -1;
  72         }
  73
  74         return 0;
  75 }
  76
  77 static size_t weird_push(void *cd, const char **inbuf, size_t *inbytesleft,
  78                          char **outbuf, size_t *outbytesleft)
  79 {
  80         int ir_count=0;
  81
  82         while (*inbytesleft >= 2 && *outbytesleft >= 1) {
  83                 int i;
  84                 int done=0;
  85                 for (i=0;weird_table[i].from;i++) {
  86                         if ((*inbuf)[0] == weird_table[i].from &&
  87                             (*inbuf)[1] == 0) {
  88                                 if (*outbytesleft < weird_table[i].len) {
  89                                         DEBUG(0,("No room for weird character\n"));
  90                                         /* smb_panic("weird_push"); */
  91                                 } else {
  92                                         memcpy(*outbuf, weird_table[i].to,
  93                                                weird_table[i].len);
  94                                         (*inbytesleft)  -= 2;
  95                                         (*outbytesleft) -= weird_table[i].len;
  96                                         (*inbuf)  += 2;
  97                                         (*outbuf) += weird_table[i].len;
  98                                         done = 1;
  99                                         break;
 100                                 }
 101                         }
 102                 }
 103                 if (done) continue;
 104
 105                 (*outbuf)[0] = (*inbuf)[0];
 106                 if ((*inbuf)[1]) ir_count++;
 107                 (*inbytesleft)  -= 2;
 108                 (*outbytesleft) -= 1;
 109                 (*inbuf)  += 2;
 110                 (*outbuf) += 1;
 111         }
 112
 113         if (*inbytesleft == 1) {
 114                 errno = EINVAL;
 115                 return -1;
 116         }
 117
 118         if (*inbytesleft > 1) {
 119                 errno = E2BIG;
 120                 return -1;
 121         }
 122
 123         return ir_count;
 124 }
 125
 126 struct charset_functions weird_functions = {"WEIRD", weird_pull, weird_push};
 127
 128 NTSTATUS charset_weird_init(void)
 129 {
 130         return smb_register_charset(&weird_functions);
 131 }