/src/dcmtk/oficonv/libsrc/citrus_utf7.c

Source
/*-
 * Copyright (c)2004, 2005 Citrus Project,
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#include "dcmtk/config/osconfig.h"
#include "citrus_utf7.h"


#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>

#include "citrus_bcs.h"
#include "citrus_types.h"
#include "citrus_module.h"
#include "citrus_stdenc.h"

/* ----------------------------------------------------------------------
 * private stuffs used by templates
 */

#define EI_MASK     UINT16_C(0xff)
#define EI_DIRECT   UINT16_C(0x100)
#define EI_OPTION   UINT16_C(0x200)
#define EI_SPACE    UINT16_C(0x400)

typedef struct {
    uint16_t     cell[0x80];
} _UTF7EncodingInfo;

typedef struct {
    unsigned int
        mode: 1,    /* whether base64 mode */
        bits: 4,    /* need to hold 0 - 15 */
        cache: 22;  /* 22 = BASE64_BIT + UTF16_BIT */
    int chlen;
    char ch[4]; /* BASE64_IN, 3 * 6 = 18, most closed to UTF16_BIT */
} _UTF7State;

#define _CEI_TO_EI(_cei_)       (&(_cei_)->ei)
#define _CEI_TO_STATE(_cei_, _func_)    (_cei_)->states.s_##_func_

#define _FUNCNAME(m)            _citrus_UTF7_##m
#define _ENCODING_INFO          _UTF7EncodingInfo
#define _ENCODING_STATE         _UTF7State
#define _ENCODING_MB_CUR_MAX(_ei_)      4
#define _ENCODING_IS_STATE_DEPENDENT        1
#define _STATE_NEEDS_EXPLICIT_INIT(_ps_)    0

static __inline void
/*ARGSUSED*/
_citrus_UTF7_init_state(_UTF7EncodingInfo * ei ,
    _UTF7State * s)
{
    (void) ei;
    memset((void *)s, 0, sizeof(*s));
}

static const char base64[] =
    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    "abcdefghijklmnopqrstuvwxyz"
    "0123456789+/";

static const char direct[] =
    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    "abcdefghijklmnopqrstuvwxyz"
    "0123456789'(),-./:?";

static const char option[] = "!\"#$%&*;<=>@[]^_`{|}";
static const char spaces[] = " \t\r\n";

#define BASE64_BIT  6
#define UTF16_BIT   16

#define BASE64_MAX  0x3f
#define UTF16_MAX   UINT16_C(0xffff)
#define UTF32_MAX   UINT32_C(0x10ffff)

#define BASE64_IN   '+'
#define BASE64_OUT  '-'

#define SHIFT7BIT(c)    ((c) >> 7)
#define ISSPECIAL(c)    ((c) == '\0' || (c) == BASE64_IN)

#define FINDLEN(ei, c) \
    (SHIFT7BIT((c)) ? -1 : (((ei)->cell[(c)] & EI_MASK) - 1))

#define ISDIRECT(ei, c) (!SHIFT7BIT((c)) && (ISSPECIAL((c)) || \
    ei->cell[(c)] & (EI_DIRECT | EI_OPTION | EI_SPACE)))

#define ISSAFE(ei, c)   (!SHIFT7BIT((c)) && (ISSPECIAL((c)) || \
    (c < 0x80 && ei->cell[(c)] & (EI_DIRECT | EI_SPACE))))

/* surrogate pair */
#define SRG_BASE    UINT32_C(0x10000)
#define HISRG_MIN   UINT16_C(0xd800)
#define HISRG_MAX   UINT16_C(0xdbff)
#define LOSRG_MIN   UINT16_C(0xdc00)
#define LOSRG_MAX   UINT16_C(0xdfff)

static int
_citrus_UTF7_mbtoutf16(_UTF7EncodingInfo * ei,
    uint16_t * u16, char ** s, size_t n,
    _UTF7State * psenc, size_t * nresult)
{
    char *s0;
    int done, i, len;

    *nresult = 0;
    s0 = *s;

    for (i = 0, done = 0; done == 0; i++) {
        if (i == psenc->chlen) {
            if (n-- < 1) {
                *nresult = (size_t)-2;
                *s = s0;
                return (0);
            }
            psenc->ch[psenc->chlen++] = *s0++;
        }
        if (SHIFT7BIT((int)psenc->ch[i]))
            goto ilseq;
        if (!psenc->mode) {
            if (psenc->bits > 0 || psenc->cache > 0)
                return (EINVAL);
            if (psenc->ch[i] == BASE64_IN)
                psenc->mode = 1;
            else {
                if (!ISDIRECT(ei, (int)psenc->ch[i]))
                    goto ilseq;
                *u16 = (uint16_t)psenc->ch[i];
                done = 1;
                continue;
            }
        } else {
            if (psenc->ch[i] == BASE64_OUT && psenc->cache == 0) {
                psenc->mode = 0;
                *u16 = (uint16_t)BASE64_IN;
                done = 1;
                continue;
            }
            len = FINDLEN(ei, (int)psenc->ch[i]);
            if (len < 0) {
                if (psenc->bits >= BASE64_BIT)
                    return (EINVAL);
                psenc->mode = 0;
                psenc->bits = psenc->cache = 0;
                if (psenc->ch[i] != BASE64_OUT) {
                    if (!ISDIRECT(ei, (int)psenc->ch[i]))
                        goto ilseq;
                    *u16 = (uint16_t)psenc->ch[i];
                    done = 1;
                } else {
                    psenc->chlen--;
                    i--;
                }
            } else {
                psenc->cache =
                    (psenc->cache << BASE64_BIT) | len;
                switch (psenc->bits) {
                case 0: case 2: case 4: case 6: case 8:
                    psenc->bits += BASE64_BIT;
                    break;
                case 10: case 12: case 14:
                    psenc->bits -= (UTF16_BIT - BASE64_BIT);
                    *u16 = (psenc->cache >> psenc->bits) &
                        UTF16_MAX;
                    done = 1;
                    break;
                default:
                    return (EINVAL);
                }
            }
        }
    }

    if (psenc->chlen > i)
        return (EINVAL);
    psenc->chlen = 0;
    *nresult = (size_t)((*u16 == 0) ? 0 : s0 - *s);
    *s = s0;

    return (0);

ilseq:
    *nresult = (size_t)-1;
    return (EILSEQ);
}

static int
_citrus_UTF7_mbrtowc_priv(_UTF7EncodingInfo * ei,
    _citrus_wc_t * pwc, char ** s, size_t n,
    _UTF7State * psenc, size_t * nresult)
{
    uint32_t u32;
    uint16_t hi, lo;
    size_t nr, siz;
    int err;

    if (*s == NULL) {
        _citrus_UTF7_init_state(ei, psenc);
        *nresult = (size_t)_ENCODING_IS_STATE_DEPENDENT;
        return (0);
    }
    err = _citrus_UTF7_mbtoutf16(ei, &hi, s, n, psenc, &nr);
    if (nr == (size_t)-1 || nr == (size_t)-2) {
        *nresult = nr;
        return (err);
    }
    if (err != 0)
        return (err);
    n -= nr;
    siz = nr;
    if (hi < HISRG_MIN || hi > HISRG_MAX) {
        u32 = (uint32_t)hi;
        goto done;
    }
    err = _citrus_UTF7_mbtoutf16(ei, &lo, s, n, psenc, &nr);
    if (nr == (size_t)-1 || nr == (size_t)-2) {
        psenc->chlen = 1; /* make get_state_desc return incomplete */
        *nresult = nr;
        return (err);
    }
    if (err != 0)
        return (err);
    if (lo < LOSRG_MIN || lo > LOSRG_MAX) {
        *nresult = (size_t)-1;
        return (EILSEQ);
    }
    hi -= HISRG_MIN;
    lo -= LOSRG_MIN;
    u32 = (hi << 10 | lo) + SRG_BASE;
    siz += nr;
done:
    if (pwc != NULL)
        *pwc = (_citrus_wc_t)u32;
    if (u32 == (uint32_t)0) {
        *nresult = (size_t)0;
        _citrus_UTF7_init_state(ei, psenc);
    } else {
        *nresult = siz;
    }
    return (err);
}

static int
_citrus_UTF7_utf16tomb(_UTF7EncodingInfo * ei,
    char * s, size_t n , uint16_t u16,
    _UTF7State * psenc, size_t * nresult)
{
    int bits, i;

    (void) n;

    if (psenc->chlen != 0 || psenc->bits > BASE64_BIT)
        return (EINVAL);

    if (ISSAFE(ei, u16)) {
        if (psenc->mode) {
            if (psenc->bits > 0) {
                bits = BASE64_BIT - psenc->bits;
                i = (psenc->cache << bits) & BASE64_MAX;
                psenc->ch[psenc->chlen++] = base64[i];
                psenc->bits = psenc->cache = 0;
            }
            if (u16 == BASE64_OUT || FINDLEN(ei, u16) >= 0)
                psenc->ch[psenc->chlen++] = BASE64_OUT;
            psenc->mode = 0;
        }
        if (psenc->bits != 0)
            return (EINVAL);
        psenc->ch[psenc->chlen++] = (char)u16;
        if (u16 == BASE64_IN)
            psenc->ch[psenc->chlen++] = BASE64_OUT;
    } else {
        if (!psenc->mode) {
            if (psenc->bits > 0)
                return (EINVAL);
            psenc->ch[psenc->chlen++] = BASE64_IN;
            psenc->mode = 1;
        }
        psenc->cache = (psenc->cache << UTF16_BIT) | u16;
        bits = UTF16_BIT + psenc->bits;
        psenc->bits = bits % BASE64_BIT;
        while ((bits -= BASE64_BIT) >= 0) {
            i = (psenc->cache >> bits) & BASE64_MAX;
            psenc->ch[psenc->chlen++] = base64[i];
        }
    }
    memcpy(s, psenc->ch, psenc->chlen);
    *nresult = psenc->chlen;
    psenc->chlen = 0;

    return (0);
}

static int
_citrus_UTF7_wcrtomb_priv(_UTF7EncodingInfo * ei,
    char * s, size_t n, _citrus_wc_t wchar,
    _UTF7State * psenc, size_t * nresult)
{
    uint32_t u32;
    uint16_t u16[2];
    int err, i, len;
    size_t nr, siz;

    u32 = (uint32_t)wchar;
    if (u32 <= UTF16_MAX) {
        u16[0] = (uint16_t)u32;
        len = 1;
    } else if (u32 <= UTF32_MAX) {
        u32 -= SRG_BASE;
        u16[0] = (uint16_t) ((u32 >> 10) + HISRG_MIN);
        u16[1] = ((uint16_t)(u32 & UINT32_C(0x3ff))) + LOSRG_MIN;
        len = 2;
    } else {
        *nresult = (size_t)-1;
        return (EILSEQ);
    }
    siz = 0;
    for (i = 0; i < len; ++i) {
        err = _citrus_UTF7_utf16tomb(ei, s, n, u16[i], psenc, &nr);
        if (err != 0)
            return (err); /* XXX: state has been modified */
        s += nr;
        n -= nr;
        siz += nr;
    }
    *nresult = siz;

    return (0);
}

static int
/* ARGSUSED */
_citrus_UTF7_put_state_reset(_UTF7EncodingInfo * ei ,
    char * s, size_t n, _UTF7State * psenc,
    size_t * nresult)
{
    int bits, pos;
    (void) ei;

    if (psenc->chlen != 0 || psenc->bits > BASE64_BIT)
        return (EINVAL);

    if (psenc->mode) {
        if (psenc->bits > 0) {
            if (n-- < 1)
                return (E2BIG);
            bits = BASE64_BIT - psenc->bits;
            pos = (psenc->cache << bits) & BASE64_MAX;
            psenc->ch[psenc->chlen++] = base64[pos];
            psenc->ch[psenc->chlen++] = BASE64_OUT;
            psenc->bits = psenc->cache = 0;
        }
        psenc->mode = 0;
    }
    if (psenc->bits != 0)
        return (EINVAL);
    if (n-- < 1)
        return (E2BIG);

    *nresult = (size_t)psenc->chlen;
    if (psenc->chlen > 0) {
        memcpy(s, psenc->ch, psenc->chlen);
        psenc->chlen = 0;
    }

    return (0);
}

static __inline int
/*ARGSUSED*/
_citrus_UTF7_stdenc_wctocs(_UTF7EncodingInfo * ei ,
    _citrus_csid_t * csid, _citrus_index_t * idx, _citrus_wc_t wc)
{
    (void) ei;

    *csid = 0;
    *idx = (_citrus_index_t)wc;

    return (0);
}

static __inline int
/*ARGSUSED*/
_citrus_UTF7_stdenc_cstowc(_UTF7EncodingInfo * ei ,
    _citrus_wc_t * wc, _citrus_csid_t csid, _citrus_index_t idx)
{
    (void) ei;

    if (csid != 0)
        return (EILSEQ);
    *wc = (_citrus_wc_t)idx;

    return (0);
}

static __inline int
/*ARGSUSED*/
_citrus_UTF7_stdenc_get_state_desc_generic(_UTF7EncodingInfo * ei ,
    _UTF7State * psenc, int * rstate)
{
    (void) ei;

    *rstate = (psenc->chlen == 0) ? _CITRUS_STDENC_SDGEN_INITIAL :
        _CITRUS_STDENC_SDGEN_INCOMPLETE_CHAR;
    return (0);
}

static void
/*ARGSUSED*/
_citrus_UTF7_encoding_module_uninit(_UTF7EncodingInfo *ei )
{
    (void) ei;

    /* ei seems to be unused */
}

static int
/*ARGSUSED*/
_citrus_UTF7_encoding_module_init(_UTF7EncodingInfo * ei,
    const void * var , size_t lenvar )
{
    const char *s;
    (void) var;
    (void) lenvar;

    memset(ei, 0, sizeof(*ei));

#define FILL(str, flag)             \
do {                        \
    for (s = str; *s != '\0'; s++)      \
        ei->cell[*s & 0x7f] |= flag;    \
} while (/*CONSTCOND*/0)

    FILL(base64, (s - base64) + 1);
    FILL(direct, EI_DIRECT);
    FILL(option, EI_OPTION);
    FILL(spaces, EI_SPACE);

    return (0);
}

/* ----------------------------------------------------------------------
 * public interface for stdenc
 */

_CITRUS_STDENC_DECLS(UTF7);
_CITRUS_STDENC_DEF_OPS(UTF7);

#include "citrus_stdenc_template.h"

Coverage Report

Created: 2026-06-30 07:05

Line	Count	Source
1		/*-
2		* Copyright (c)2004, 2005 Citrus Project,
3		* All rights reserved.
4		*
5		* Redistribution and use in source and binary forms, with or without
6		* modification, are permitted provided that the following conditions
7		* are met:
8		* 1. Redistributions of source code must retain the above copyright
9		* notice, this list of conditions and the following disclaimer.
10		* 2. Redistributions in binary form must reproduce the above copyright
11		* notice, this list of conditions and the following disclaimer in the
12		* documentation and/or other materials provided with the distribution.
13		*
14		* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15		* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16		* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17		* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18		* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19		* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20		* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21		* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22		* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23		* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24		* SUCH DAMAGE.
25		*
26		*/
27
28		#include "dcmtk/config/osconfig.h"
29		#include "citrus_utf7.h"
30
31
32		#include <errno.h>
33		#include <limits.h>
34		#include <stdio.h>
35		#include <stdint.h>
36		#include <stdlib.h>
37		#include <string.h>
38		#include <wchar.h>
39
40		#include "citrus_bcs.h"
41		#include "citrus_types.h"
42		#include "citrus_module.h"
43		#include "citrus_stdenc.h"
44
45		/* ----------------------------------------------------------------------
46		* private stuffs used by templates
47		*/
48
49	0	#define EI_MASK UINT16_C(0xff)
50	0	#define EI_DIRECT UINT16_C(0x100)
51	0	#define EI_OPTION UINT16_C(0x200)
52	0	#define EI_SPACE UINT16_C(0x400)
53
54		typedef struct {
55		uint16_t cell[0x80];
56		} _UTF7EncodingInfo;
57
58		typedef struct {
59		unsigned int
60		mode: 1, /* whether base64 mode */
61		bits: 4, /* need to hold 0 - 15 */
62		cache: 22; /* 22 = BASE64_BIT + UTF16_BIT */
63		int chlen;
64		char ch[4]; /* BASE64_IN, 3 * 6 = 18, most closed to UTF16_BIT */
65		} _UTF7State;
66
67		#define _CEI_TO_EI(_cei_) (&(_cei_)->ei)
68		#define _CEI_TO_STATE(_cei_, _func_) (_cei_)->states.s_##_func_
69
70	0	#define _FUNCNAME(m) _citrus_UTF7_##m
71	0	#define _ENCODING_INFO _UTF7EncodingInfo
72		#define _ENCODING_STATE _UTF7State
73	0	#define _ENCODING_MB_CUR_MAX(_ei_) 4
74	0	#define _ENCODING_IS_STATE_DEPENDENT 1
75		#define _STATE_NEEDS_EXPLICIT_INIT(_ps_) 0
76
77		static __inline void
78		/ARGSUSED/
79		_citrus_UTF7_init_state(_UTF7EncodingInfo * ei ,
80		_UTF7State * s)
81	0	{
82	0	(void) ei;
83	0	memset((void )s, 0, sizeof(s));
84	0	}
85
86		static const char base64[] =
87		"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
88		"abcdefghijklmnopqrstuvwxyz"
89		"0123456789+/";
90
91		static const char direct[] =
92		"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
93		"abcdefghijklmnopqrstuvwxyz"
94		"0123456789'(),-./:?";
95
96		static const char option[] = "!\"#$%&*;<=>@[]^_`{\|}";
97		static const char spaces[] = " \t\r\n";
98
99	0	#define BASE64_BIT 6
100	0	#define UTF16_BIT 16
101
102	0	#define BASE64_MAX 0x3f
103	0	#define UTF16_MAX UINT16_C(0xffff)
104	0	#define UTF32_MAX UINT32_C(0x10ffff)
105
106	0	#define BASE64_IN '+'
107	0	#define BASE64_OUT '-'
108
109	0	#define SHIFT7BIT(c) ((c) >> 7)
110	0	#define ISSPECIAL(c) ((c) == '\0' \|\| (c) == BASE64_IN)
111
112		#define FINDLEN(ei, c) \
113	0	(SHIFT7BIT((c)) ? -1 : (((ei)->cell[(c)] & EI_MASK) - 1))
114
115	0	#define ISDIRECT(ei, c) (!SHIFT7BIT((c)) && (ISSPECIAL((c)) \|\| \
116	0	ei->cell[(c)] & (EI_DIRECT \| EI_OPTION \| EI_SPACE)))
117
118	0	#define ISSAFE(ei, c) (!SHIFT7BIT((c)) && (ISSPECIAL((c)) \|\| \
119	0	(c < 0x80 && ei->cell[(c)] & (EI_DIRECT \| EI_SPACE))))
120
121		/* surrogate pair */
122	0	#define SRG_BASE UINT32_C(0x10000)
123	0	#define HISRG_MIN UINT16_C(0xd800)
124	0	#define HISRG_MAX UINT16_C(0xdbff)
125	0	#define LOSRG_MIN UINT16_C(0xdc00)
126	0	#define LOSRG_MAX UINT16_C(0xdfff)
127
128		static int
129		_citrus_UTF7_mbtoutf16(_UTF7EncodingInfo * ei,
130		uint16_t * u16, char ** s, size_t n,
131		_UTF7State * psenc, size_t * nresult)
132	0	{
133	0	char *s0;
134	0	int done, i, len;
135
136	0	*nresult = 0;
137	0	s0 = *s;
138
139	0	for (i = 0, done = 0; done == 0; i++) {
140	0	if (i == psenc->chlen) {
141	0	if (n-- < 1) {
142	0	*nresult = (size_t)-2;
143	0	*s = s0;
144	0	return (0);
145	0	}
146	0	psenc->ch[psenc->chlen++] = *s0++;
147	0	}
148	0	if (SHIFT7BIT((int)psenc->ch[i]))
149	0	goto ilseq;
150	0	if (!psenc->mode) {
151	0	if (psenc->bits > 0 \|\| psenc->cache > 0)
152	0	return (EINVAL);
153	0	if (psenc->ch[i] == BASE64_IN)
154	0	psenc->mode = 1;
155	0	else {
156	0	if (!ISDIRECT(ei, (int)psenc->ch[i]))
157	0	goto ilseq;
158	0	*u16 = (uint16_t)psenc->ch[i];
159	0	done = 1;
160	0	continue;
161	0	}
162	0	} else {
163	0	if (psenc->ch[i] == BASE64_OUT && psenc->cache == 0) {
164	0	psenc->mode = 0;
165	0	*u16 = (uint16_t)BASE64_IN;
166	0	done = 1;
167	0	continue;
168	0	}
169	0	len = FINDLEN(ei, (int)psenc->ch[i]);
170	0	if (len < 0) {
171	0	if (psenc->bits >= BASE64_BIT)
172	0	return (EINVAL);
173	0	psenc->mode = 0;
174	0	psenc->bits = psenc->cache = 0;
175	0	if (psenc->ch[i] != BASE64_OUT) {
176	0	if (!ISDIRECT(ei, (int)psenc->ch[i]))
177	0	goto ilseq;
178	0	*u16 = (uint16_t)psenc->ch[i];
179	0	done = 1;
180	0	} else {
181	0	psenc->chlen--;
182	0	i--;
183	0	}
184	0	} else {
185	0	psenc->cache =
186	0	(psenc->cache << BASE64_BIT) \| len;
187	0	switch (psenc->bits) {
188	0	case 0: case 2: case 4: case 6: case 8:
189	0	psenc->bits += BASE64_BIT;
190	0	break;
191	0	case 10: case 12: case 14:
192	0	psenc->bits -= (UTF16_BIT - BASE64_BIT);
193	0	*u16 = (psenc->cache >> psenc->bits) &
194	0	UTF16_MAX;
195	0	done = 1;
196	0	break;
197	0	default:
198	0	return (EINVAL);
199	0	}
200	0	}
201	0	}
202	0	}
203
204	0	if (psenc->chlen > i)
205	0	return (EINVAL);
206	0	psenc->chlen = 0;
207	0	nresult = (size_t)((u16 == 0) ? 0 : s0 - *s);
208	0	*s = s0;
209
210	0	return (0);
211
212	0	ilseq:
213	0	*nresult = (size_t)-1;
214	0	return (EILSEQ);
215	0	}
216
217		static int
218		_citrus_UTF7_mbrtowc_priv(_UTF7EncodingInfo * ei,
219		_citrus_wc_t * pwc, char ** s, size_t n,
220		_UTF7State * psenc, size_t * nresult)
221	0	{
222	0	uint32_t u32;
223	0	uint16_t hi, lo;
224	0	size_t nr, siz;
225	0	int err;
226
227	0	if (*s == NULL) {
228	0	_citrus_UTF7_init_state(ei, psenc);
229	0	*nresult = (size_t)_ENCODING_IS_STATE_DEPENDENT;
230	0	return (0);
231	0	}
232	0	err = _citrus_UTF7_mbtoutf16(ei, &hi, s, n, psenc, &nr);
233	0	if (nr == (size_t)-1 \|\| nr == (size_t)-2) {
234	0	*nresult = nr;
235	0	return (err);
236	0	}
237	0	if (err != 0)
238	0	return (err);
239	0	n -= nr;
240	0	siz = nr;
241	0	if (hi < HISRG_MIN \|\| hi > HISRG_MAX) {
242	0	u32 = (uint32_t)hi;
243	0	goto done;
244	0	}
245	0	err = _citrus_UTF7_mbtoutf16(ei, &lo, s, n, psenc, &nr);
246	0	if (nr == (size_t)-1 \|\| nr == (size_t)-2) {
247	0	psenc->chlen = 1; /* make get_state_desc return incomplete */
248	0	*nresult = nr;
249	0	return (err);
250	0	}
251	0	if (err != 0)
252	0	return (err);
253	0	if (lo < LOSRG_MIN \|\| lo > LOSRG_MAX) {
254	0	*nresult = (size_t)-1;
255	0	return (EILSEQ);
256	0	}
257	0	hi -= HISRG_MIN;
258	0	lo -= LOSRG_MIN;
259	0	u32 = (hi << 10 \| lo) + SRG_BASE;
260	0	siz += nr;
261	0	done:
262	0	if (pwc != NULL)
263	0	*pwc = (_citrus_wc_t)u32;
264	0	if (u32 == (uint32_t)0) {
265	0	*nresult = (size_t)0;
266	0	_citrus_UTF7_init_state(ei, psenc);
267	0	} else {
268	0	*nresult = siz;
269	0	}
270	0	return (err);
271	0	}
272
273		static int
274		_citrus_UTF7_utf16tomb(_UTF7EncodingInfo * ei,
275		char * s, size_t n , uint16_t u16,
276		_UTF7State * psenc, size_t * nresult)
277	0	{
278	0	int bits, i;
279
280	0	(void) n;
281
282	0	if (psenc->chlen != 0 \|\| psenc->bits > BASE64_BIT)
283	0	return (EINVAL);
284
285	0	if (ISSAFE(ei, u16)) {
286	0	if (psenc->mode) {
287	0	if (psenc->bits > 0) {
288	0	bits = BASE64_BIT - psenc->bits;
289	0	i = (psenc->cache << bits) & BASE64_MAX;
290	0	psenc->ch[psenc->chlen++] = base64[i];
291	0	psenc->bits = psenc->cache = 0;
292	0	}
293	0	if (u16 == BASE64_OUT \|\| FINDLEN(ei, u16) >= 0)
294	0	psenc->ch[psenc->chlen++] = BASE64_OUT;
295	0	psenc->mode = 0;
296	0	}
297	0	if (psenc->bits != 0)
298	0	return (EINVAL);
299	0	psenc->ch[psenc->chlen++] = (char)u16;
300	0	if (u16 == BASE64_IN)
301	0	psenc->ch[psenc->chlen++] = BASE64_OUT;
302	0	} else {
303	0	if (!psenc->mode) {
304	0	if (psenc->bits > 0)
305	0	return (EINVAL);
306	0	psenc->ch[psenc->chlen++] = BASE64_IN;
307	0	psenc->mode = 1;
308	0	}
309	0	psenc->cache = (psenc->cache << UTF16_BIT) \| u16;
310	0	bits = UTF16_BIT + psenc->bits;
311	0	psenc->bits = bits % BASE64_BIT;
312	0	while ((bits -= BASE64_BIT) >= 0) {
313	0	i = (psenc->cache >> bits) & BASE64_MAX;
314	0	psenc->ch[psenc->chlen++] = base64[i];
315	0	}
316	0	}
317	0	memcpy(s, psenc->ch, psenc->chlen);
318	0	*nresult = psenc->chlen;
319	0	psenc->chlen = 0;
320
321	0	return (0);
322	0	}
323
324		static int
325		_citrus_UTF7_wcrtomb_priv(_UTF7EncodingInfo * ei,
326		char * s, size_t n, _citrus_wc_t wchar,
327		_UTF7State * psenc, size_t * nresult)
328	0	{
329	0	uint32_t u32;
330	0	uint16_t u16[2];
331	0	int err, i, len;
332	0	size_t nr, siz;
333
334	0	u32 = (uint32_t)wchar;
335	0	if (u32 <= UTF16_MAX) {
336	0	u16[0] = (uint16_t)u32;
337	0	len = 1;
338	0	} else if (u32 <= UTF32_MAX) {
339	0	u32 -= SRG_BASE;
340	0	u16[0] = (uint16_t) ((u32 >> 10) + HISRG_MIN);
341	0	u16[1] = ((uint16_t)(u32 & UINT32_C(0x3ff))) + LOSRG_MIN;
342	0	len = 2;
343	0	} else {
344	0	*nresult = (size_t)-1;
345	0	return (EILSEQ);
346	0	}
347	0	siz = 0;
348	0	for (i = 0; i < len; ++i) {
349	0	err = _citrus_UTF7_utf16tomb(ei, s, n, u16[i], psenc, &nr);
350	0	if (err != 0)
351	0	return (err); /* XXX: state has been modified */
352	0	s += nr;
353	0	n -= nr;
354	0	siz += nr;
355	0	}
356	0	*nresult = siz;
357
358	0	return (0);
359	0	}
360
361		static int
362		/* ARGSUSED */
363		_citrus_UTF7_put_state_reset(_UTF7EncodingInfo * ei ,
364		char * s, size_t n, _UTF7State * psenc,
365		size_t * nresult)
366	0	{
367	0	int bits, pos;
368	0	(void) ei;
369
370	0	if (psenc->chlen != 0 \|\| psenc->bits > BASE64_BIT)
371	0	return (EINVAL);
372
373	0	if (psenc->mode) {
374	0	if (psenc->bits > 0) {
375	0	if (n-- < 1)
376	0	return (E2BIG);
377	0	bits = BASE64_BIT - psenc->bits;
378	0	pos = (psenc->cache << bits) & BASE64_MAX;
379	0	psenc->ch[psenc->chlen++] = base64[pos];
380	0	psenc->ch[psenc->chlen++] = BASE64_OUT;
381	0	psenc->bits = psenc->cache = 0;
382	0	}
383	0	psenc->mode = 0;
384	0	}
385	0	if (psenc->bits != 0)
386	0	return (EINVAL);
387	0	if (n-- < 1)
388	0	return (E2BIG);
389
390	0	*nresult = (size_t)psenc->chlen;
391	0	if (psenc->chlen > 0) {
392	0	memcpy(s, psenc->ch, psenc->chlen);
393	0	psenc->chlen = 0;
394	0	}
395
396	0	return (0);
397	0	}
398
399		static __inline int
400		/ARGSUSED/
401		_citrus_UTF7_stdenc_wctocs(_UTF7EncodingInfo * ei ,
402		_citrus_csid_t * csid, _citrus_index_t * idx, _citrus_wc_t wc)
403	0	{
404	0	(void) ei;
405
406	0	*csid = 0;
407	0	*idx = (_citrus_index_t)wc;
408
409	0	return (0);
410	0	}
411
412		static __inline int
413		/ARGSUSED/
414		_citrus_UTF7_stdenc_cstowc(_UTF7EncodingInfo * ei ,
415		_citrus_wc_t * wc, _citrus_csid_t csid, _citrus_index_t idx)
416	0	{
417	0	(void) ei;
418
419	0	if (csid != 0)
420	0	return (EILSEQ);
421	0	*wc = (_citrus_wc_t)idx;
422
423	0	return (0);
424	0	}
425
426		static __inline int
427		/ARGSUSED/
428		_citrus_UTF7_stdenc_get_state_desc_generic(_UTF7EncodingInfo * ei ,
429		_UTF7State * psenc, int * rstate)
430	0	{
431	0	(void) ei;
432
433	0	*rstate = (psenc->chlen == 0) ? _CITRUS_STDENC_SDGEN_INITIAL :
434	0	_CITRUS_STDENC_SDGEN_INCOMPLETE_CHAR;
435	0	return (0);
436	0	}
437
438		static void
439		/ARGSUSED/
440		_citrus_UTF7_encoding_module_uninit(_UTF7EncodingInfo *ei )
441	0	{
442	0	(void) ei;
443
444		/* ei seems to be unused */
445	0	}
446
447		static int
448		/ARGSUSED/
449		_citrus_UTF7_encoding_module_init(_UTF7EncodingInfo * ei,
450		const void * var , size_t lenvar )
451	0	{
452	0	const char *s;
453	0	(void) var;
454	0	(void) lenvar;
455
456	0	memset(ei, 0, sizeof(*ei));
457
458	0	#define FILL(str, flag) \
459	0	do { \
460	0	for (s = str; *s != '\0'; s++) \
461	0	ei->cell[*s & 0x7f] \|= flag; \
462	0	} while (/CONSTCOND/0)
463
464	0	FILL(base64, (s - base64) + 1);
465	0	FILL(direct, EI_DIRECT);
466	0	FILL(option, EI_OPTION);
467	0	FILL(spaces, EI_SPACE);
468
469	0	return (0);
470	0	}
471
472		/* ----------------------------------------------------------------------
473		* public interface for stdenc
474		*/
475
476		_CITRUS_STDENC_DECLS(UTF7);
477		_CITRUS_STDENC_DEF_OPS(UTF7);
478
479		#include "citrus_stdenc_template.h"