forked from Mirrors/freeswitch
300 lines
8.5 KiB
C
300 lines
8.5 KiB
C
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/*-
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* Copyright (c) 2000
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* Konstantin Chuguev. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Konstantin Chuguev
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* and its contributors.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* iconv (Charset Conversion Library) v1.0
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*/
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#include <stdlib.h>
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#define ICONV_INTERNAL
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#include <iconv.h>
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static const char * const names[] = {
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"unicode-1-1-utf-7",
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"utf-7",
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NULL
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};
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static const char * const *
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utf7_names(struct iconv_ces *ces)
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{
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return names;
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}
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static APR_INLINE int
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lackofbytes(int bytes, apr_size_t *bytesleft)
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{
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if (bytes > *bytesleft)
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return 1;
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(*bytesleft) -= bytes;
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return 0;
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}
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static const char *base64_str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789+/";
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#define base64(ch) (base64_str[(ch) & 0x3F])
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static APR_INLINE int output(char ch, unsigned char **outbuf)
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{
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*(*outbuf)++ = ch;
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return 1;
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}
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static int
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encode(char *state, ucs_t ch, unsigned char **outbuf)
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{
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switch (state[0]) {
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case 2:
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output(base64(state[1] | (ch >> 14)), outbuf);
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output(base64(ch >> 8), outbuf);
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output(base64(ch >> 2), outbuf);
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state[1] = ch << 4;
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state[0] = 3;
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break;
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case 3:
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output(base64(state[1] | (ch >> 12)), outbuf);
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output(base64(ch >> 6), outbuf);
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output(base64(ch), outbuf);
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state[0] = 1;
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break;
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default:
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output(base64(ch >> 10), outbuf);
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output(base64(ch >> 4), outbuf);
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state[1] = ch << 2;
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state[0] = 2;
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}
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return 1;
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}
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enum { utf7_printable, utf7_base64, utf7_encoded, utf7_shift_in,
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utf7_shift_out, utf7_end };
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#define between(ch, min, max) ((min) <= (ch) && (ch) <= (max))
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static int char_type(ucs_t ch)
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{
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switch (ch) {
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case UCS_CHAR_NONE:
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return utf7_end;
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case '-':
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return utf7_shift_out;
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case '+':
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return utf7_shift_in;
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case ':':
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case '?':
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return utf7_printable;
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}
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return (between(ch, '/', '9') || between(ch, 'A', 'Z') ||
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between(ch, 'a', 'z')) ?
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utf7_base64 :
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(ch <= ' ' || (between(ch, '\'', '.') && ch != '*')) ?
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utf7_printable :
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utf7_encoded;
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}
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static apr_ssize_t
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convert_from_ucs(struct iconv_ces *module, ucs_t in,
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unsigned char **outbuf, apr_size_t *outbytesleft)
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{
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#define utf7_state ((char *)(module->data))
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int ch = char_type(in), needbytes = 3;
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if (iconv_char32bit(in))
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return -1;
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if (utf7_state[0]) {
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needbytes = utf7_state[0] > 1 ? 1 : 0;
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switch (ch) {
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case utf7_encoded:
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case utf7_shift_in:
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return lackofbytes(needbytes + 2, outbytesleft)
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? 0 : encode(utf7_state, in, outbuf);
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case utf7_base64:
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case utf7_shift_out:
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needbytes ++;
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case utf7_printable:
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needbytes ++;
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break;
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default:
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if (needbytes) {
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output(base64(utf7_state[1]), outbuf);
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(*outbytesleft) --;
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}
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return 1;
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}
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if (lackofbytes(needbytes, outbytesleft))
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return 0;
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if (utf7_state[0] > 1)
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output(base64(utf7_state[1]), outbuf);
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if (ch != utf7_printable)
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output('-', outbuf);
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utf7_state[0] = 0;
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return output((unsigned char)in, outbuf);
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}
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switch (ch) {
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case utf7_end:
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return 1;
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case utf7_base64:
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case utf7_printable:
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case utf7_shift_out:
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(*outbytesleft) --;
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return output((unsigned char)in, outbuf);
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case utf7_shift_in:
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needbytes = 2;
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}
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if (lackofbytes(needbytes, outbytesleft))
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return 0;
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output('+', outbuf);
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return ch == utf7_shift_in ? output('-', outbuf)
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: encode(utf7_state, in, outbuf);
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#undef utf7_state
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}
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static ucs_t base64_input(const unsigned char **inbuf, int *error)
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{
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unsigned char ch = *(*inbuf)++;
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if (between(ch, 'A', 'Z'))
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return ch - 'A';
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else if (between(ch, 'a', 'z'))
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return ch - 'a' + 26;
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else if (between(ch, '0', '9'))
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return ch - '0' + 52;
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else if (ch == '+')
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return 62;
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else if (ch == '/')
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return 63;
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*error = 1;
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return UCS_CHAR_INVALID;
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}
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static ucs_t decode(char *state, const unsigned char **inbuf)
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{
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int errflag = 0;
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ucs_t res, ch;
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switch (state[0]) {
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case 2:
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res = ((unsigned)(state[1]) << 14)
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| (base64_input(inbuf, &errflag) << 8)
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| (base64_input(inbuf, &errflag) << 2)
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| ((ch = base64_input(inbuf, &errflag)) >> 4);
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if (errflag)
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return UCS_CHAR_INVALID;
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state[1] = ch;
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state[0] = 3;
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break;
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case 3:
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res = ((unsigned)(state[1]) << 12)
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| (base64_input(inbuf, &errflag) << 6)
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| base64_input(inbuf, &errflag);
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if (errflag)
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return UCS_CHAR_INVALID;
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state[0] = 1;
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break;
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default:
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res = (base64_input(inbuf, &errflag) << 10)
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| (base64_input(inbuf, &errflag) << 4)
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| ((ch = base64_input(inbuf, &errflag)) >> 2);
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if (errflag)
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return UCS_CHAR_INVALID;
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state[1] = ch;
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state[0] = 2;
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}
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return res & 0xFFFF;
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}
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static ucs_t convert_to_ucs(struct iconv_ces *module,
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const unsigned char **inbuf, apr_size_t *inbytesleft)
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{
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#define utf7_state ((char *)(module->data))
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int ch = char_type(*(unsigned char *)*inbuf), needbytes = 0;
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if (ch == utf7_encoded)
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return lackofbytes(1, inbytesleft) ? UCS_CHAR_NONE
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: UCS_CHAR_INVALID;
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if (utf7_state[0]) {
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switch (ch) {
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case utf7_shift_out:
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if (*inbytesleft < 2)
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return UCS_CHAR_NONE;
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needbytes = 1;
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ch = char_type(*(++((unsigned char *)*inbuf)));
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(*inbytesleft) --;
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case utf7_printable:
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utf7_state[0] = 0;
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break;
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default:
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return lackofbytes(utf7_state[0] > 2 ? 2 : 3, inbytesleft)
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? UCS_CHAR_NONE : decode(utf7_state, inbuf);
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}
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}
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if (ch == utf7_shift_in) {
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if (*inbytesleft < 2) {
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(*inbuf) -= needbytes;
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(*inbytesleft) += needbytes;
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return UCS_CHAR_NONE;
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}
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switch (char_type(*(++(unsigned char *)*inbuf))) {
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case utf7_shift_out:
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(*inbuf) ++;
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(*inbytesleft) -= 2;
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return '+';
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case utf7_base64:
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case utf7_shift_in:
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if (lackofbytes(4, inbytesleft)) {
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(*inbuf) -= (++needbytes);
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(*inbytesleft) += needbytes;
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return UCS_CHAR_NONE;
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}
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return decode(utf7_state, inbuf);
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}
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(*inbytesleft) --;
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return UCS_CHAR_INVALID;
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}
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(*inbytesleft) --;
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return *((unsigned char *)*inbuf) ++;
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#undef utf7_state
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}
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static const struct iconv_ces_desc iconv_ces_desc = {
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apr_iconv_ces_open_func,
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apr_iconv_ces_close_func,
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apr_iconv_ces_reset_func,
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utf7_names,
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apr_iconv_ces_nbits7,
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apr_iconv_ces_zero,
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convert_from_ucs,
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convert_to_ucs, NULL
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};
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struct iconv_module_desc iconv_module = {
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ICMOD_UC_CES,
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apr_iconv_mod_noevent,
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NULL,
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&iconv_ces_desc
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};
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