source: branches/samba-3.3.x/source/modules/weird.c

/* 
   Unix SMB/CIFS implementation.
   Samba module with developer tools
   Copyright (C) Andrew Tridgell 2001
   Copyright (C) Jelmer Vernooij 2002
   
   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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"

static struct {
        char from;
        const char *to;
        int len;
} weird_table[] = {
        {'q', "^q^", 3},
        {'Q', "^Q^", 3},
        {0, NULL}
};

static size_t weird_pull(void *cd, const char **inbuf, size_t *inbytesleft,
                         char **outbuf, size_t *outbytesleft)
{
        while (*inbytesleft >= 1 && *outbytesleft >= 2) {
                int i;
                int done = 0;
                for (i=0;weird_table[i].from;i++) {
                        if (strncmp((*inbuf), 
                                    weird_table[i].to, 
                                    weird_table[i].len) == 0) {
                                if (*inbytesleft < weird_table[i].len) {
                                        DEBUG(0,("ERROR: truncated weird string\n"));
                                        /* smb_panic("weird_pull"); */

                                } else {
                                        (*outbuf)[0] = weird_table[i].from;
                                        (*outbuf)[1] = 0;
                                        (*inbytesleft)  -= weird_table[i].len;
                                        (*outbytesleft) -= 2;
                                        (*inbuf)  += weird_table[i].len;
                                        (*outbuf) += 2;
                                        done = 1;
                                        break;
                                }
                        }
                }
                if (done) continue;
                (*outbuf)[0] = (*inbuf)[0];
                (*outbuf)[1] = 0;
                (*inbytesleft)  -= 1;
                (*outbytesleft) -= 2;
                (*inbuf)  += 1;
                (*outbuf) += 2;
        }

        if (*inbytesleft > 0) {
                errno = E2BIG;
                return -1;
        }
        
        return 0;
}

static size_t weird_push(void *cd, const char **inbuf, size_t *inbytesleft,
                         char **outbuf, size_t *outbytesleft)
{
        int ir_count=0;

        while (*inbytesleft >= 2 && *outbytesleft >= 1) {
                int i;
                int done=0;
                for (i=0;weird_table[i].from;i++) {
                        if ((*inbuf)[0] == weird_table[i].from &&
                            (*inbuf)[1] == 0) {
                                if (*outbytesleft < weird_table[i].len) {
                                        DEBUG(0,("No room for weird character\n"));
                                        /* smb_panic("weird_push"); */
                                } else {
                                        memcpy(*outbuf, weird_table[i].to, 
                                               weird_table[i].len);
                                        (*inbytesleft)  -= 2;
                                        (*outbytesleft) -= weird_table[i].len;
                                        (*inbuf)  += 2;
                                        (*outbuf) += weird_table[i].len;
                                        done = 1;
                                        break;
                                }
                        }
                }
                if (done) continue;

                (*outbuf)[0] = (*inbuf)[0];
                if ((*inbuf)[1]) ir_count++;
                (*inbytesleft)  -= 2;
                (*outbytesleft) -= 1;
                (*inbuf)  += 2;
                (*outbuf) += 1;
        }

        if (*inbytesleft == 1) {
                errno = EINVAL;
                return -1;
        }

        if (*inbytesleft > 1) {
                errno = E2BIG;
                return -1;
        }
        
        return ir_count;
}

struct charset_functions weird_functions = {"WEIRD", weird_pull, weird_push};

NTSTATUS charset_weird_init(void);
NTSTATUS charset_weird_init(void)
{
        return smb_register_charset(&weird_functions);
}