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355 lines
10 KiB
C
355 lines
10 KiB
C
/*
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* Copyright (C) 1999-2001, 2008, 2016 Free Software Foundation, Inc.
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* This file is part of the GNU LIBICONV Library.
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*
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* The GNU LIBICONV Library is free software; you can redistribute it
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* and/or modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* The GNU LIBICONV Library is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with the GNU LIBICONV Library; see the file COPYING.LIB.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* UTF-7
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*/
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/* Specification: RFC 2152 (and old RFC 1641, RFC 1642) */
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/* The original Base64 encoding is defined in RFC 2045. */
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/* Set of direct characters:
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* A-Z a-z 0-9 ' ( ) , - . / : ? space tab lf cr
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*/
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static const unsigned char direct_tab[128/8] = {
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0x00, 0x26, 0x00, 0x00, 0x81, 0xf3, 0xff, 0x87,
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0xfe, 0xff, 0xff, 0x07, 0xfe, 0xff, 0xff, 0x07,
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};
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#define isdirect(ch) ((ch) < 128 && ((direct_tab[(ch)>>3] >> (ch & 7)) & 1))
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/* Set of direct and optional direct characters:
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* A-Z a-z 0-9 ' ( ) , - . / : ? space tab lf cr
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* ! " # $ % & * ; < = > @ [ ] ^ _ ` { | }
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*/
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static const unsigned char xdirect_tab[128/8] = {
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0x00, 0x26, 0x00, 0x00, 0xff, 0xf7, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xef, 0xff, 0xff, 0xff, 0x3f,
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};
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#define isxdirect(ch) ((ch) < 128 && ((xdirect_tab[(ch)>>3] >> (ch & 7)) & 1))
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/* Set of base64 characters, extended:
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* A-Z a-z 0-9 + / -
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*/
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static const unsigned char xbase64_tab[128/8] = {
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0x00, 0x00, 0x00, 0x00, 0x00, 0xa8, 0xff, 0x03,
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0xfe, 0xff, 0xff, 0x07, 0xfe, 0xff, 0xff, 0x07,
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};
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#define isxbase64(ch) ((ch) < 128 && ((xbase64_tab[(ch)>>3] >> (ch & 7)) & 1))
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/*
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* The state is structured as follows:
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* bit 1..0: shift
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* bit 7..2: data
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* Precise meaning:
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* shift data
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* 0 0 not inside base64 encoding
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* 1 0 inside base64, no pending bits
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* 2 XXXX00 inside base64, 4 bits remain from 2nd byte
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* 3 XX0000 inside base64, 2 bits remain from 3rd byte
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*/
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static int
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utf7_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
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{
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state_t state = conv->istate;
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int count = 0; /* number of input bytes already read */
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if (state & 3)
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goto active;
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else
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goto inactive;
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inactive:
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{
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/* Here (state & 3) == 0 */
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if (n < count+1)
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goto none;
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{
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unsigned char c = *s;
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if (isxdirect(c)) {
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*pwc = (ucs4_t) c;
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conv->istate = state;
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return count+1;
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}
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if (c == '+') {
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if (n < count+2)
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goto none;
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if (s[1] == '-') {
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*pwc = (ucs4_t) '+';
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conv->istate = state;
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return count+2;
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}
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s++; count++;
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state = 1;
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goto active;
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}
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goto ilseq;
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}
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}
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active:
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{
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/* base64 encoding active */
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unsigned int wc = 0;
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state_t base64state = state;
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unsigned int kmax = 2; /* number of payload bytes to read */
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unsigned int k = 0; /* number of payload bytes already read */
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unsigned int base64count = 0; /* number of base64 bytes already read */
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for (;;) {
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unsigned char c = *s;
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unsigned int i;
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if (c >= 'A' && c <= 'Z')
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i = c-'A';
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else if (c >= 'a' && c <= 'z')
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i = c-'a'+26;
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else if (c >= '0' && c <= '9')
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i = c-'0'+52;
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else if (c == '+')
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i = 62;
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else if (c == '/')
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i = 63;
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else {
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/* c terminates base64 encoding */
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if (base64state & -4)
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goto ilseq; /* data must be 0, otherwise illegal */
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if (base64count)
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goto ilseq; /* partial UTF-16 characters are invalid */
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if (c == '-') {
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s++; count++;
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}
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state = 0;
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goto inactive;
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}
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s++; base64count++;
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/* read 6 bits: 0 <= i < 64 */
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switch (base64state & 3) {
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case 1: /* inside base64, no pending bits */
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base64state = (i << 2) | 0; break;
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case 0: /* inside base64, 6 bits remain from 1st byte */
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wc = (wc << 8) | (base64state & -4) | (i >> 4); k++;
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base64state = ((i & 15) << 4) | 2; break;
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case 2: /* inside base64, 4 bits remain from 2nd byte */
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wc = (wc << 8) | (base64state & -4) | (i >> 2); k++;
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base64state = ((i & 3) << 6) | 3; break;
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case 3: /* inside base64, 2 bits remain from 3rd byte */
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wc = (wc << 8) | (base64state & -4) | i; k++;
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base64state = 1; break;
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}
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if (k == kmax) {
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/* UTF-16: When we see a High Surrogate, we must also decode
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the following Low Surrogate. */
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if (kmax == 2 && (wc >= 0xd800 && wc < 0xdc00))
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kmax = 4;
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else
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break;
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}
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if (n < count+base64count+1)
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goto none;
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}
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/* Here k = kmax > 0, hence base64count > 0. */
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if ((base64state & 3) == 0) abort();
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if (kmax == 4) {
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ucs4_t wc1 = wc >> 16;
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ucs4_t wc2 = wc & 0xffff;
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if (!(wc1 >= 0xd800 && wc1 < 0xdc00)) abort();
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if (!(wc2 >= 0xdc00 && wc2 < 0xe000)) goto ilseq;
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*pwc = 0x10000 + ((wc1 - 0xd800) << 10) + (wc2 - 0xdc00);
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} else {
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*pwc = wc;
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}
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conv->istate = base64state;
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return count+base64count;
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}
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none:
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conv->istate = state;
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return RET_TOOFEW(count);
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ilseq:
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conv->istate = state;
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return RET_SHIFT_ILSEQ(count);
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}
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/*
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* The state is structured as follows:
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* bit 1..0: shift
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* bit 7..2: data
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* Precise meaning:
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* shift data
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* 0 0 not inside base64 encoding
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* 1 0 inside base64, no pending bits
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* 2 XX00 inside base64, 2 bits known for 2nd byte
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* 3 XXXX inside base64, 4 bits known for 3rd byte
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*/
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/* Define this to 1 if you want the so-called "optional direct" characters
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! " # $ % & * ; < = > @ [ ] ^ _ ` { | }
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to be encoded. Define to 0 if you want them to be passed straight through,
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like the so-called "direct" characters.
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We set this to 1 because it's safer.
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*/
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#define UTF7_ENCODE_OPTIONAL_CHARS 1
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static int
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utf7_wctomb (conv_t conv, unsigned char *r, ucs4_t iwc, size_t n)
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{
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state_t state = conv->ostate;
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unsigned int wc = iwc;
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int count = 0;
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if (state & 3)
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goto active;
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/*inactive:*/
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{
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if (UTF7_ENCODE_OPTIONAL_CHARS ? isdirect(wc) : isxdirect(wc)) {
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r[0] = (unsigned char) wc;
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/*conv->ostate = state;*/
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return 1;
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} else {
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*r++ = '+';
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if (wc == '+') {
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if (n < 2)
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return RET_TOOSMALL;
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*r = '-';
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/*conv->ostate = state;*/
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return 2;
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}
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count = 1;
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state = 1;
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goto active;
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}
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}
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active:
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{
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/* base64 encoding active */
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if (UTF7_ENCODE_OPTIONAL_CHARS ? isdirect(wc) : isxdirect(wc)) {
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/* deactivate base64 encoding */
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count += ((state & 3) >= 2 ? 1 : 0) + (isxbase64(wc) ? 1 : 0) + 1;
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if (n < count)
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return RET_TOOSMALL;
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if ((state & 3) >= 2) {
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unsigned int i = state & -4;
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unsigned char c;
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if (i < 26)
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c = i+'A';
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else if (i < 52)
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c = i-26+'a';
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else if (i < 62)
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c = i-52+'0';
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else if (i == 62)
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c = '+';
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else if (i == 63)
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c = '/';
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else
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abort();
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*r++ = c;
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}
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if (isxbase64(wc))
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*r++ = '-';
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state = 0;
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*r++ = (unsigned char) wc;
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conv->ostate = state;
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return count;
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} else {
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unsigned int k; /* number of payload bytes to write */
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if (wc < 0x10000) {
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k = 2;
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count += ((state & 3) >= 2 ? 3 : 2);
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} else if (wc < 0x110000) {
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unsigned int wc1 = 0xd800 + ((wc - 0x10000) >> 10);
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unsigned int wc2 = 0xdc00 + ((wc - 0x10000) & 0x3ff);
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wc = (wc1 << 16) | wc2;
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k = 4;
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count += ((state & 3) >= 3 ? 6 : 5);
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} else
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return RET_ILUNI;
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if (n < count)
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return RET_TOOSMALL;
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for (;;) {
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unsigned int i;
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unsigned char c;
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switch (state & 3) {
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case 0: /* inside base64, 6 bits known for 4th byte */
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c = (state & -4) >> 2; state = 1; break;
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case 1: /* inside base64, no pending bits */
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i = (wc >> (8 * --k)) & 0xff;
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c = i >> 2; state = ((i & 3) << 4) | 2; break;
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case 2: /* inside base64, 2 bits known for 2nd byte */
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i = (wc >> (8 * --k)) & 0xff;
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c = (state & -4) | (i >> 4); state = ((i & 15) << 2) | 3; break;
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case 3: /* inside base64, 4 bits known for 3rd byte */
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i = (wc >> (8 * --k)) & 0xff;
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c = (state & -4) | (i >> 6); state = ((i & 63) << 2) | 0; break;
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default: abort(); /* stupid gcc */
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}
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if (c < 26)
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c = c+'A';
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else if (c < 52)
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c = c-26+'a';
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else if (c < 62)
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c = c-52+'0';
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else if (c == 62)
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c = '+';
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else if (c == 63)
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c = '/';
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else
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abort();
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*r++ = c;
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if ((state & 3) && (k == 0))
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break;
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}
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conv->ostate = state;
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return count;
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}
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}
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}
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static int
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utf7_reset (conv_t conv, unsigned char *r, size_t n)
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{
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state_t state = conv->ostate;
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if (state & 3) {
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/* deactivate base64 encoding */
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unsigned int count = ((state & 3) >= 2 ? 1 : 0) + 1;
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if (n < count)
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return RET_TOOSMALL;
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if ((state & 3) >= 2) {
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unsigned int i = state & -4;
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unsigned char c;
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if (i < 26)
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c = i+'A';
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else if (i < 52)
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c = i-26+'a';
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else if (i < 62)
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c = i-52+'0';
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else if (i == 62)
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c = '+';
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else if (i == 63)
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c = '/';
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else
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abort();
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*r++ = c;
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}
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*r++ = '-';
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/* conv->ostate = 0; will be done by the caller */
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return count;
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} else
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return 0;
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}
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