lib/util/charset/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 "replace.h"
  22 #include "charset_proto.h"
  23
  24 #ifdef DEVELOPER
  25
  26 static struct {
  27         char from;
  28         const char *to;
  29         int len;
  30 } weird_table[] = {
  31         {
  32                 .from = 'q',
  33                 .to   = "^q^",
  34                 .len  = 3,
  35         },
  36         {
  37                 .from = 'Q',
  38                 .to   = "^Q^",
  39                 .len  = 3,
  40         },
  41         {
  42                 .len = 0,
  43         }
  44 };
  45
  46 size_t weird_pull(void *cd, const char **inbuf, size_t *inbytesleft,
  47                   char **outbuf, size_t *outbytesleft)
  48 {
  49         while (*inbytesleft >= 1 && *outbytesleft >= 2) {
  50                 int i;
  51                 int done = 0;
  52                 for (i=0;weird_table[i].from;i++) {
  53                         if (strncmp((*inbuf),
  54                                     weird_table[i].to,
  55                                     weird_table[i].len) == 0) {
  56                                 if (*inbytesleft < weird_table[i].len) {
  57                                         abort();
  58                                 }
  59
  60                                 (*outbuf)[0] = weird_table[i].from;
  61                                 (*outbuf)[1] = 0;
  62                                 (*inbytesleft)  -= weird_table[i].len;
  63                                 (*outbytesleft) -= 2;
  64                                 (*inbuf)  += weird_table[i].len;
  65                                 (*outbuf) += 2;
  66                                 done = 1;
  67                                 break;
  68                         }
  69                 }
  70                 if (done) continue;
  71                 (*outbuf)[0] = (*inbuf)[0];
  72                 (*outbuf)[1] = 0;
  73                 (*inbytesleft)  -= 1;
  74                 (*outbytesleft) -= 2;
  75                 (*inbuf)  += 1;
  76                 (*outbuf) += 2;
  77         }
  78
  79         if (*inbytesleft > 0) {
  80                 errno = E2BIG;
  81                 return -1;
  82         }
  83
  84         return 0;
  85 }
  86
  87 size_t weird_push(void *cd, const char **inbuf, size_t *inbytesleft,
  88                   char **outbuf, size_t *outbytesleft)
  89 {
  90         int ir_count=0;
  91
  92         while (*inbytesleft >= 2 && *outbytesleft >= 1) {
  93                 int i;
  94                 int done=0;
  95                 for (i=0;weird_table[i].from;i++) {
  96                         if ((*inbuf)[0] == weird_table[i].from &&
  97                             (*inbuf)[1] == 0) {
  98                                 if (*outbytesleft < weird_table[i].len) {
  99                                         abort();
 100                                 }
 101                                 memcpy(*outbuf,
 102                                        weird_table[i].to,
 103                                        weird_table[i].len);
 104                                 (*inbytesleft)  -= 2;
 105                                 (*outbytesleft) -= weird_table[i].len;
 106                                 (*inbuf)  += 2;
 107                                 (*outbuf) += weird_table[i].len;
 108                                 done = 1;
 109                                 break;
 110                         }
 111                 }
 112                 if (done) continue;
 113
 114                 (*outbuf)[0] = (*inbuf)[0];
 115                 if ((*inbuf)[1]) ir_count++;
 116                 (*inbytesleft)  -= 2;
 117                 (*outbytesleft) -= 1;
 118                 (*inbuf)  += 2;
 119                 (*outbuf) += 1;
 120         }
 121
 122         if (*inbytesleft == 1) {
 123                 errno = EINVAL;
 124                 return -1;
 125         }
 126
 127         if (*inbytesleft > 1) {
 128                 errno = E2BIG;
 129                 return -1;
 130         }
 131
 132         return ir_count;
 133 }
 134
 135 #else
 136 void charset_weird_dummy(void);
 137 void charset_weird_dummy(void)
 138 {
 139         return;
 140 }
 141
 142 #endif