/*
   Unix SMB/CIFS implementation.
   minimal iconv implementation
   Copyright (C) Andrew Tridgell 2001
   Copyright (C) Jelmer Vernooij 2002,2003

   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 2 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, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

   From samba 3.0 beta and GNU libiconv-1.8
   It's bad but most of the time we can't use libc iconv service:
   - it doesn't round trip for most encoding
   - it doesn't know about Apple extension
*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <arpa/inet.h>

#include <atalk/unicode.h>
#include <atalk/logger.h>
#include <atalk/byteorder.h>

#include "mac_hebrew.h"

static size_t   mac_hebrew_pull(void *, char **, size_t *, char **, size_t *);
static size_t   mac_hebrew_push(void *, char **, size_t *, char **, size_t *);

struct charset_functions charset_mac_hebrew = {
    "MAC_HEBREW",
    5,
    mac_hebrew_pull,
    mac_hebrew_push,
    CHARSET_CLIENT | CHARSET_MULTIBYTE,
    NULL,
    NULL,
    NULL
};


/* ------------------------
 * from unicode to mac hebrew code page
*/
static int
char_ucs2_to_mac_hebrew(unsigned char *r, ucs2_t wc)
{
    unsigned char c = 0;

    if (wc < 0x0080) {
        *r = wc;
        return 1;
    } else if (wc >= 0x00a0 && wc < 0x0100) {
        c = mac_hebrew_page00[wc - 0x00a0];
    } else if (wc >= 0x05b0 && wc < 0x05f0) {
        c = mac_hebrew_page05[wc - 0x05b0];
    } else if (wc >= 0x2010 && wc < 0x2028) {
        c = mac_hebrew_page20[wc - 0x2010];
    } else if (wc == 0x20aa) {
        c = 0xa6;
    } else if (wc >= 0xfb18 && wc < 0xfb50) {
        c = mac_hebrew_pagefb[wc - 0xfb18];
    }

    if (c != 0) {
        *r = c;
        return 1;
    }

    return 0;
}

static size_t mac_hebrew_push(void *cd _U_, char **inbuf, size_t *inbytesleft,
                              char **outbuf, size_t *outbytesleft)
{
    unsigned char c = 0;
    int len = 0;
    unsigned char *tmpptr = (unsigned char *) *outbuf;

    while (*inbytesleft >= 2 && *outbytesleft >= 1) {
        ucs2_t inptr = SVAL((*inbuf), 0);

        if (inptr == 0x05b8) {
            (*inbuf) += 2;
            (*inbytesleft)  -= 2;

            if (*inbytesleft >= 2 && SVAL((*inbuf), 0) == 0xf87f) {
                (*inbuf) += 2;
                (*inbytesleft)  -= 2;
                c = 0xde;
            } else {
                c = 0xcb;
            }

            *tmpptr = c;
        } else if (inptr == 0x05f2 && *inbytesleft >= 4
                   && SVAL((*inbuf), 2) == 0x05b7) {
            (*inbuf) += 4;
            (*inbytesleft)  -= 4;
            *tmpptr = 0x81;
        } else if (inptr == 0xf86a && *inbytesleft >= 6 && SVAL((*inbuf), 2) == 0x05dc
                   && SVAL((*inbuf), 4) == 0x05b9) {
            (*inbuf) += 6;
            (*inbytesleft)  -= 6;
            *tmpptr = 0xc0;
        } else if (char_ucs2_to_mac_hebrew(tmpptr, inptr)) {
            (*inbuf) += 2;
            (*inbytesleft)  -= 2;
        } else {
            errno = EILSEQ;
            return (size_t) -1;
        }

        (*outbytesleft) -= 1;
        tmpptr++;
        len++;
    }

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

    return len;
}

/* ------------------------ */
static int
char_mac_hebrew_to_ucs2(ucs2_t *pwc, const unsigned char *s)
{
    unsigned char c = *s;

    if (c < 0x80) {
        *pwc = (ucs2_t) c;
        return 1;
    } else {
        unsigned short wc = mac_hebrew_2uni[c - 0x80];

        if (wc != 0xfffd) {
            *pwc = (ucs2_t) wc;
            return 1;
        }
    }

    return 0;
}

static size_t mac_hebrew_pull(void *cd _U_, char **inbuf, size_t *inbytesleft,
                              char **outbuf, size_t *outbytesleft)
{
    ucs2_t         temp;
    unsigned char  *inptr;
    size_t         len = 0;

    while (*inbytesleft >= 1 && *outbytesleft >= 2) {
        inptr = (unsigned char *) *inbuf;

        if (char_mac_hebrew_to_ucs2(&temp, inptr)) {
            if (temp == 1) {       /* 0x81 --> 0x05f2+0x05b7 */
                if (*outbytesleft < 4) {
                    errno = E2BIG;
                    return (size_t) -1;
                }

                SSVAL((*outbuf), 0, 0x05f2);
                SSVAL((*outbuf), 2, 0x05b7);
                (*outbuf) += 4;
                (*outbytesleft) -= 4;
                len += 2;
            } else if (temp == 2) { /* 0xc0 -> 0xf86a 0x05dc 0x05b9*/
                if (*outbytesleft < 6) {
                    errno = E2BIG;
                    return (size_t) -1;
                }

                SSVAL((*outbuf), 0, 0xf86a);
                SSVAL((*outbuf), 2, 0x05dc);
                SSVAL((*outbuf), 4, 0x05b9);
                (*outbuf) += 6;
                (*outbytesleft) -= 6;
                len += 3;
            } else if (temp == 3) { /* 0xde --> 0x05b8 0xf87f */
                if (*outbytesleft < 4) {
                    errno = E2BIG;
                    return (size_t) -1;
                }

                SSVAL((*outbuf), 0, 0x05b8);
                SSVAL((*outbuf), 2, 0xf87f);
                (*outbuf) += 4;
                (*outbytesleft) -= 4;
                len += 2;
            } else {
                SSVAL((*outbuf), 0, temp);
                (*outbuf) += 2;
                (*outbytesleft) -= 2;
                len++;
            }

            (*inbuf) += 1;
            (*inbytesleft) -= 1;
        } else {
            errno = EILSEQ;
            return (size_t) -1;
        }
    }

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

    return len;
}

