mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-05 07:33:38 +08:00
2748878913
* iconvdata/utf-7.c: Don't require more than two characters after the '+' sign starting Unicode shifted sequences.
533 lines
18 KiB
C
533 lines
18 KiB
C
/* Conversion module for UTF-7.
|
|
Copyright (C) 2000-2002, 2003, 2004 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Bruno Haible <haible@clisp.cons.org>, 2000.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
/* UTF-7 is a legacy encoding used for transmitting Unicode within the
|
|
ASCII character set, used primarily by mail agents. New programs
|
|
are encouraged to use UTF-8 instead.
|
|
|
|
UTF-7 is specified in RFC 2152 (and old RFC 1641, RFC 1642). The
|
|
original Base64 encoding is defined in RFC 2045. */
|
|
|
|
#include <dlfcn.h>
|
|
#include <gconv.h>
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
|
|
|
|
/* Define this to 1 if you want the so-called "optional direct" characters
|
|
! " # $ % & * ; < = > @ [ ] ^ _ ` { | }
|
|
to be encoded. Define to 0 if you want them to be passed straight
|
|
through, like the so-called "direct" characters.
|
|
We set this to 1 because it's safer.
|
|
*/
|
|
#define UTF7_ENCODE_OPTIONAL_CHARS 1
|
|
|
|
|
|
/* The set of "direct characters":
|
|
A-Z a-z 0-9 ' ( ) , - . / : ? space tab lf cr
|
|
*/
|
|
|
|
static const unsigned char direct_tab[128 / 8] =
|
|
{
|
|
0x00, 0x26, 0x00, 0x00, 0x81, 0xf3, 0xff, 0x87,
|
|
0xfe, 0xff, 0xff, 0x07, 0xfe, 0xff, 0xff, 0x07
|
|
};
|
|
|
|
static int
|
|
isdirect (uint32_t ch)
|
|
{
|
|
return (ch < 128 && ((direct_tab[ch >> 3] >> (ch & 7)) & 1));
|
|
}
|
|
|
|
|
|
/* The set of "direct and optional direct characters":
|
|
A-Z a-z 0-9 ' ( ) , - . / : ? space tab lf cr
|
|
! " # $ % & * ; < = > @ [ ] ^ _ ` { | }
|
|
*/
|
|
|
|
static const unsigned char xdirect_tab[128 / 8] =
|
|
{
|
|
0x00, 0x26, 0x00, 0x00, 0xff, 0xf7, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xef, 0xff, 0xff, 0xff, 0x3f
|
|
};
|
|
|
|
static int
|
|
isxdirect (uint32_t ch)
|
|
{
|
|
return (ch < 128 && ((xdirect_tab[ch >> 3] >> (ch & 7)) & 1));
|
|
}
|
|
|
|
|
|
/* The set of "extended base64 characters":
|
|
A-Z a-z 0-9 + / -
|
|
*/
|
|
|
|
static const unsigned char xbase64_tab[128 / 8] =
|
|
{
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0xa8, 0xff, 0x03,
|
|
0xfe, 0xff, 0xff, 0x07, 0xfe, 0xff, 0xff, 0x07
|
|
};
|
|
|
|
static int
|
|
isxbase64 (uint32_t ch)
|
|
{
|
|
return (ch < 128 && ((xbase64_tab[ch >> 3] >> (ch & 7)) & 1));
|
|
}
|
|
|
|
|
|
/* Converts a value in the range 0..63 to a base64 encoded char. */
|
|
static unsigned char
|
|
base64 (unsigned int i)
|
|
{
|
|
if (i < 26)
|
|
return i + 'A';
|
|
else if (i < 52)
|
|
return i - 26 + 'a';
|
|
else if (i < 62)
|
|
return i - 52 + '0';
|
|
else if (i == 62)
|
|
return '+';
|
|
else if (i == 63)
|
|
return '/';
|
|
else
|
|
abort ();
|
|
}
|
|
|
|
|
|
/* Definitions used in the body of the `gconv' function. */
|
|
#define CHARSET_NAME "UTF-7//"
|
|
#define DEFINE_INIT 1
|
|
#define DEFINE_FINI 1
|
|
#define FROM_LOOP from_utf7_loop
|
|
#define TO_LOOP to_utf7_loop
|
|
#define MIN_NEEDED_FROM 1
|
|
#define MAX_NEEDED_FROM 6
|
|
#define MIN_NEEDED_TO 4
|
|
#define MAX_NEEDED_TO 4
|
|
#define PREPARE_LOOP \
|
|
mbstate_t saved_state; \
|
|
mbstate_t *statep = data->__statep;
|
|
#define EXTRA_LOOP_ARGS , statep
|
|
|
|
|
|
/* Since we might have to reset input pointer we must be able to save
|
|
and restore the state. */
|
|
#define SAVE_RESET_STATE(Save) \
|
|
if (Save) \
|
|
saved_state = *statep; \
|
|
else \
|
|
*statep = saved_state
|
|
|
|
|
|
/* First define the conversion function from UTF-7 to UCS4.
|
|
The state is structured as follows:
|
|
__count bit 2..0: zero
|
|
__count bit 8..3: shift
|
|
__wch: data
|
|
Precise meaning:
|
|
shift data
|
|
0 -- not inside base64 encoding
|
|
1..32 XX..XX00..00 inside base64, (32 - shift) bits pending
|
|
This state layout is simpler than relying on STORE_REST/UNPACK_BYTES.
|
|
|
|
When shift = 0, __wch needs to store at most one lookahead byte (see
|
|
__GCONV_INCOMPLETE_INPUT below).
|
|
*/
|
|
#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
|
|
#define MAX_NEEDED_INPUT MAX_NEEDED_FROM
|
|
#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
|
|
#define MAX_NEEDED_OUTPUT MAX_NEEDED_TO
|
|
#define LOOPFCT FROM_LOOP
|
|
#define BODY \
|
|
{ \
|
|
uint_fast8_t ch = *inptr; \
|
|
\
|
|
if ((statep->__count >> 3) == 0) \
|
|
{ \
|
|
/* base64 encoding inactive. */ \
|
|
if (isxdirect (ch)) \
|
|
{ \
|
|
inptr++; \
|
|
put32 (outptr, ch); \
|
|
outptr += 4; \
|
|
} \
|
|
else if (__builtin_expect (ch == '+', 1)) \
|
|
{ \
|
|
if (__builtin_expect (inptr + 2 > inend, 0)) \
|
|
{ \
|
|
/* Not enough input available. */ \
|
|
result = __GCONV_INCOMPLETE_INPUT; \
|
|
break; \
|
|
} \
|
|
if (inptr[1] == '-') \
|
|
{ \
|
|
inptr += 2; \
|
|
put32 (outptr, ch); \
|
|
outptr += 4; \
|
|
} \
|
|
else \
|
|
{ \
|
|
/* Switch into base64 mode. */ \
|
|
inptr++; \
|
|
statep->__count = (32 << 3); \
|
|
statep->__value.__wch = 0; \
|
|
} \
|
|
} \
|
|
else \
|
|
{ \
|
|
/* The input is invalid. */ \
|
|
STANDARD_FROM_LOOP_ERR_HANDLER (1); \
|
|
} \
|
|
} \
|
|
else \
|
|
{ \
|
|
/* base64 encoding active. */ \
|
|
uint32_t i; \
|
|
int shift; \
|
|
\
|
|
if (ch >= 'A' && ch <= 'Z') \
|
|
i = ch - 'A'; \
|
|
else if (ch >= 'a' && ch <= 'z') \
|
|
i = ch - 'a' + 26; \
|
|
else if (ch >= '0' && ch <= '9') \
|
|
i = ch - '0' + 52; \
|
|
else if (ch == '+') \
|
|
i = 62; \
|
|
else if (ch == '/') \
|
|
i = 63; \
|
|
else \
|
|
{ \
|
|
/* Terminate base64 encoding. */ \
|
|
\
|
|
/* If accumulated data is nonzero, the input is invalid. */ \
|
|
/* Also, partial UTF-16 characters are invalid. */ \
|
|
if (__builtin_expect (statep->__value.__wch != 0, 0) \
|
|
|| __builtin_expect ((statep->__count >> 3) <= 26, 0)) \
|
|
{ \
|
|
STANDARD_FROM_LOOP_ERR_HANDLER ((statep->__count = 0, 1)); \
|
|
} \
|
|
\
|
|
if (ch == '-') \
|
|
inptr++; \
|
|
\
|
|
statep->__count = 0; \
|
|
continue; \
|
|
} \
|
|
\
|
|
/* Concatenate the base64 integer i to the accumulator. */ \
|
|
shift = (statep->__count >> 3); \
|
|
if (shift > 6) \
|
|
{ \
|
|
uint32_t wch; \
|
|
\
|
|
shift -= 6; \
|
|
wch = statep->__value.__wch | (i << shift); \
|
|
\
|
|
if (shift <= 16 && shift > 10) \
|
|
{ \
|
|
/* An UTF-16 character has just been completed. */ \
|
|
uint32_t wc1 = wch >> 16; \
|
|
\
|
|
/* UTF-16: When we see a High Surrogate, we must also decode \
|
|
the following Low Surrogate. */ \
|
|
if (!(wc1 >= 0xd800 && wc1 < 0xdc00)) \
|
|
{ \
|
|
wch = wch << 16; \
|
|
shift += 16; \
|
|
put32 (outptr, wc1); \
|
|
outptr += 4; \
|
|
} \
|
|
} \
|
|
else if (shift <= 10 && shift > 4) \
|
|
{ \
|
|
/* After a High Surrogate, verify that the next 16 bit \
|
|
indeed form a Low Surrogate. */ \
|
|
uint32_t wc2 = wch & 0xffff; \
|
|
\
|
|
if (! __builtin_expect (wc2 >= 0xdc00 && wc2 < 0xe000, 1)) \
|
|
{ \
|
|
STANDARD_FROM_LOOP_ERR_HANDLER ((statep->__count = 0, 1));\
|
|
} \
|
|
} \
|
|
\
|
|
statep->__value.__wch = wch; \
|
|
} \
|
|
else \
|
|
{ \
|
|
/* An UTF-16 surrogate pair has just been completed. */ \
|
|
uint32_t wc1 = (uint32_t) statep->__value.__wch >> 16; \
|
|
uint32_t wc2 = ((uint32_t) statep->__value.__wch & 0xffff) \
|
|
| (i >> (6 - shift)); \
|
|
\
|
|
statep->__value.__wch = (i << shift) << 26; \
|
|
shift += 26; \
|
|
\
|
|
assert (wc1 >= 0xd800 && wc1 < 0xdc00); \
|
|
assert (wc2 >= 0xdc00 && wc2 < 0xe000); \
|
|
put32 (outptr, \
|
|
0x10000 + ((wc1 - 0xd800) << 10) + (wc2 - 0xdc00)); \
|
|
outptr += 4; \
|
|
} \
|
|
\
|
|
statep->__count = shift << 3; \
|
|
\
|
|
/* Now that we digested the input increment the input pointer. */ \
|
|
inptr++; \
|
|
} \
|
|
}
|
|
#define LOOP_NEED_FLAGS
|
|
#define EXTRA_LOOP_DECLS , mbstate_t *statep
|
|
#include <iconv/loop.c>
|
|
|
|
|
|
/* Next, define the conversion from UCS4 to UTF-7.
|
|
The state is structured as follows:
|
|
__count bit 2..0: zero
|
|
__count bit 4..3: shift
|
|
__count bit 8..5: data
|
|
Precise meaning:
|
|
shift data
|
|
0 0 not inside base64 encoding
|
|
1 0 inside base64, no pending bits
|
|
2 XX00 inside base64, 2 bits known for next byte
|
|
3 XXXX inside base64, 4 bits known for next byte
|
|
|
|
__count bit 2..0 and __wch are always zero, because this direction
|
|
never returns __GCONV_INCOMPLETE_INPUT.
|
|
*/
|
|
#define MIN_NEEDED_INPUT MIN_NEEDED_TO
|
|
#define MAX_NEEDED_INPUT MAX_NEEDED_TO
|
|
#define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM
|
|
#define MAX_NEEDED_OUTPUT MAX_NEEDED_FROM
|
|
#define LOOPFCT TO_LOOP
|
|
#define BODY \
|
|
{ \
|
|
uint32_t ch = get32 (inptr); \
|
|
\
|
|
if ((statep->__count & 0x18) == 0) \
|
|
{ \
|
|
/* base64 encoding inactive */ \
|
|
if (UTF7_ENCODE_OPTIONAL_CHARS ? isdirect (ch) : isxdirect (ch)) \
|
|
{ \
|
|
*outptr++ = (unsigned char) ch; \
|
|
} \
|
|
else \
|
|
{ \
|
|
size_t count; \
|
|
\
|
|
if (ch == '+') \
|
|
count = 2; \
|
|
else if (ch < 0x10000) \
|
|
count = 3; \
|
|
else if (ch < 0x110000) \
|
|
count = 6; \
|
|
else \
|
|
STANDARD_TO_LOOP_ERR_HANDLER (4); \
|
|
\
|
|
if (__builtin_expect (outptr + count > outend, 0)) \
|
|
{ \
|
|
result = __GCONV_FULL_OUTPUT; \
|
|
break; \
|
|
} \
|
|
\
|
|
*outptr++ = '+'; \
|
|
if (ch == '+') \
|
|
*outptr++ = '-'; \
|
|
else if (ch < 0x10000) \
|
|
{ \
|
|
*outptr++ = base64 (ch >> 10); \
|
|
*outptr++ = base64 ((ch >> 4) & 0x3f); \
|
|
statep->__count = ((ch & 15) << 5) | (3 << 3); \
|
|
} \
|
|
else if (ch < 0x110000) \
|
|
{ \
|
|
uint32_t ch1 = 0xd800 + ((ch - 0x10000) >> 10); \
|
|
uint32_t ch2 = 0xdc00 + ((ch - 0x10000) & 0x3ff); \
|
|
\
|
|
ch = (ch1 << 16) | ch2; \
|
|
*outptr++ = base64 (ch >> 26); \
|
|
*outptr++ = base64 ((ch >> 20) & 0x3f); \
|
|
*outptr++ = base64 ((ch >> 14) & 0x3f); \
|
|
*outptr++ = base64 ((ch >> 8) & 0x3f); \
|
|
*outptr++ = base64 ((ch >> 2) & 0x3f); \
|
|
statep->__count = ((ch & 3) << 7) | (2 << 3); \
|
|
} \
|
|
else \
|
|
abort (); \
|
|
} \
|
|
} \
|
|
else \
|
|
{ \
|
|
/* base64 encoding active */ \
|
|
if (UTF7_ENCODE_OPTIONAL_CHARS ? isdirect (ch) : isxdirect (ch)) \
|
|
{ \
|
|
/* deactivate base64 encoding */ \
|
|
size_t count; \
|
|
\
|
|
count = ((statep->__count & 0x18) >= 0x10) + isxbase64 (ch) + 1; \
|
|
if (__builtin_expect (outptr + count > outend, 0)) \
|
|
{ \
|
|
result = __GCONV_FULL_OUTPUT; \
|
|
break; \
|
|
} \
|
|
\
|
|
if ((statep->__count & 0x18) >= 0x10) \
|
|
*outptr++ = base64 ((statep->__count >> 3) & ~3); \
|
|
if (isxbase64 (ch)) \
|
|
*outptr++ = '-'; \
|
|
*outptr++ = (unsigned char) ch; \
|
|
statep->__count = 0; \
|
|
} \
|
|
else \
|
|
{ \
|
|
size_t count; \
|
|
\
|
|
if (ch < 0x10000) \
|
|
count = ((statep->__count & 0x18) >= 0x10 ? 3 : 2); \
|
|
else if (ch < 0x110000) \
|
|
count = ((statep->__count & 0x18) >= 0x18 ? 6 : 5); \
|
|
else \
|
|
STANDARD_TO_LOOP_ERR_HANDLER (4); \
|
|
\
|
|
if (__builtin_expect (outptr + count > outend, 0)) \
|
|
{ \
|
|
result = __GCONV_FULL_OUTPUT; \
|
|
break; \
|
|
} \
|
|
\
|
|
if (ch < 0x10000) \
|
|
{ \
|
|
switch ((statep->__count >> 3) & 3) \
|
|
{ \
|
|
case 1: \
|
|
*outptr++ = base64 (ch >> 10); \
|
|
*outptr++ = base64 ((ch >> 4) & 0x3f); \
|
|
statep->__count = ((ch & 15) << 5) | (3 << 3); \
|
|
break; \
|
|
case 2: \
|
|
*outptr++ = \
|
|
base64 (((statep->__count >> 3) & ~3) | (ch >> 12)); \
|
|
*outptr++ = base64 ((ch >> 6) & 0x3f); \
|
|
*outptr++ = base64 (ch & 0x3f); \
|
|
statep->__count = (1 << 3); \
|
|
break; \
|
|
case 3: \
|
|
*outptr++ = \
|
|
base64 (((statep->__count >> 3) & ~3) | (ch >> 14)); \
|
|
*outptr++ = base64 ((ch >> 8) & 0x3f); \
|
|
*outptr++ = base64 ((ch >> 2) & 0x3f); \
|
|
statep->__count = ((ch & 3) << 7) | (2 << 3); \
|
|
break; \
|
|
default: \
|
|
abort (); \
|
|
} \
|
|
} \
|
|
else if (ch < 0x110000) \
|
|
{ \
|
|
uint32_t ch1 = 0xd800 + ((ch - 0x10000) >> 10); \
|
|
uint32_t ch2 = 0xdc00 + ((ch - 0x10000) & 0x3ff); \
|
|
\
|
|
ch = (ch1 << 16) | ch2; \
|
|
switch ((statep->__count >> 3) & 3) \
|
|
{ \
|
|
case 1: \
|
|
*outptr++ = base64 (ch >> 26); \
|
|
*outptr++ = base64 ((ch >> 20) & 0x3f); \
|
|
*outptr++ = base64 ((ch >> 14) & 0x3f); \
|
|
*outptr++ = base64 ((ch >> 8) & 0x3f); \
|
|
*outptr++ = base64 ((ch >> 2) & 0x3f); \
|
|
statep->__count = ((ch & 3) << 7) | (2 << 3); \
|
|
break; \
|
|
case 2: \
|
|
*outptr++ = \
|
|
base64 (((statep->__count >> 3) & ~3) | (ch >> 28)); \
|
|
*outptr++ = base64 ((ch >> 22) & 0x3f); \
|
|
*outptr++ = base64 ((ch >> 16) & 0x3f); \
|
|
*outptr++ = base64 ((ch >> 10) & 0x3f); \
|
|
*outptr++ = base64 ((ch >> 4) & 0x3f); \
|
|
statep->__count = ((ch & 15) << 5) | (3 << 3); \
|
|
break; \
|
|
case 3: \
|
|
*outptr++ = \
|
|
base64 (((statep->__count >> 3) & ~3) | (ch >> 30)); \
|
|
*outptr++ = base64 ((ch >> 24) & 0x3f); \
|
|
*outptr++ = base64 ((ch >> 18) & 0x3f); \
|
|
*outptr++ = base64 ((ch >> 12) & 0x3f); \
|
|
*outptr++ = base64 ((ch >> 6) & 0x3f); \
|
|
*outptr++ = base64 (ch & 0x3f); \
|
|
statep->__count = (1 << 3); \
|
|
break; \
|
|
default: \
|
|
abort (); \
|
|
} \
|
|
} \
|
|
else \
|
|
abort (); \
|
|
} \
|
|
} \
|
|
\
|
|
/* Now that we wrote the output increment the input pointer. */ \
|
|
inptr += 4; \
|
|
}
|
|
#define LOOP_NEED_FLAGS
|
|
#define EXTRA_LOOP_DECLS , mbstate_t *statep
|
|
#include <iconv/loop.c>
|
|
|
|
|
|
/* Since this is a stateful encoding we have to provide code which resets
|
|
the output state to the initial state. This has to be done during the
|
|
flushing. */
|
|
#define EMIT_SHIFT_TO_INIT \
|
|
if (FROM_DIRECTION) \
|
|
/* Nothing to emit. */ \
|
|
memset (data->__statep, '\0', sizeof (mbstate_t)); \
|
|
else \
|
|
{ \
|
|
/* The "to UTF-7" direction. Flush the remaining bits and terminate \
|
|
with a '-' byte. This will guarantee correct decoding if more \
|
|
UTF-7 encoded text is added afterwards. */ \
|
|
int state = data->__statep->__count; \
|
|
\
|
|
if (state & 0x18) \
|
|
{ \
|
|
/* Deactivate base64 encoding. */ \
|
|
size_t count = ((state & 0x18) >= 0x10) + 1; \
|
|
\
|
|
if (__builtin_expect (outbuf + count > outend, 0)) \
|
|
/* We don't have enough room in the output buffer. */ \
|
|
status = __GCONV_FULL_OUTPUT; \
|
|
else \
|
|
{ \
|
|
/* Write out the shift sequence. */ \
|
|
if ((state & 0x18) >= 0x10) \
|
|
*outbuf++ = base64 ((state >> 3) & ~3); \
|
|
*outbuf++ = '-'; \
|
|
\
|
|
data->__statep->__count = 0; \
|
|
} \
|
|
} \
|
|
else \
|
|
data->__statep->__count = 0; \
|
|
}
|
|
|
|
|
|
/* Now define the toplevel functions. */
|
|
#include <iconv/skeleton.c>
|