654 lines
20 KiB
C
654 lines
20 KiB
C
/* Conversion module for UTF-7.
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Copyright (C) 2000-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* UTF-7 is a legacy encoding used for transmitting Unicode within the
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ASCII character set, used primarily by mail agents. New programs
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are encouraged to use UTF-8 instead.
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UTF-7 is specified in RFC 2152 (and old RFC 1641, RFC 1642). The
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original Base64 encoding is defined in RFC 2045. */
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#include <dlfcn.h>
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#include <gconv.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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enum variant
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{
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UTF7,
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UTF_7_IMAP
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};
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/* Must be in the same order as enum variant above. */
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static const char names[] =
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"UTF-7//\0"
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"UTF-7-IMAP//\0"
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"\0";
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static uint32_t
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shift_character (enum variant const var)
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{
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if (var == UTF7)
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return '+';
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else if (var == UTF_7_IMAP)
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return '&';
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else
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abort ();
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}
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static bool
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between (uint32_t const ch,
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uint32_t const lower_bound, uint32_t const upper_bound)
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{
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return (ch >= lower_bound && ch <= upper_bound);
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}
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/* The set of "direct characters":
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A-Z a-z 0-9 ' ( ) , - . / : ? space tab lf cr
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FOR UTF-7-IMAP
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A-Z a-z 0-9 ' ( ) , - . / : ? space
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! " # $ % + * ; < = > @ [ \ ] ^ _ ` { | } ~
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*/
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static bool
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isdirect (uint32_t ch, enum variant var)
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{
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if (var == UTF7)
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return (between (ch, 'A', 'Z')
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|| between (ch, 'a', 'z')
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|| between (ch, '0', '9')
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|| ch == '\'' || ch == '(' || ch == ')'
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|| between (ch, ',', '/')
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|| ch == ':' || ch == '?'
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|| ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r');
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else if (var == UTF_7_IMAP)
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return (ch != '&' && between (ch, ' ', '~'));
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abort ();
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}
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/* The 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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(UTF-7 only)
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! " # $ % & * ; < = > @ [ ] ^ _ ` { | }
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*/
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static bool
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isxdirect (uint32_t ch, enum variant var)
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{
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if (isdirect (ch, var))
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return true;
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if (var != UTF7)
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return false;
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return between (ch, '!', '&')
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|| ch == '*'
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|| between (ch, ';', '@')
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|| (between (ch, '[', '`') && ch != '\\')
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|| between (ch, '{', '}');
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}
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/* Characters which needs to trigger an explicit shift back to US-ASCII (UTF-7
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only): Modified base64 + '-' (shift back character)
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A-Z a-z 0-9 + / -
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*/
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static bool
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needs_explicit_shift (uint32_t ch)
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{
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return (between (ch, 'A', 'Z')
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|| between (ch, 'a', 'z')
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|| between (ch, '/', '9') || ch == '+' || ch == '-');
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}
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/* Converts a value in the range 0..63 to a base64 encoded char. */
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static unsigned char
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base64 (unsigned int i, enum variant var)
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{
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if (i < 26)
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return i + 'A';
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else if (i < 52)
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return i - 26 + 'a';
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else if (i < 62)
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return i - 52 + '0';
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else if (i == 62)
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return '+';
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else if (i == 63 && var == UTF7)
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return '/';
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else if (i == 63 && var == UTF_7_IMAP)
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return ',';
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else
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abort ();
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}
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/* Definitions used in the body of the `gconv' function. */
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#define DEFINE_INIT 0
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#define DEFINE_FINI 0
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#define FROM_LOOP from_utf7_loop
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#define TO_LOOP to_utf7_loop
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#define MIN_NEEDED_FROM 1
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#define MAX_NEEDED_FROM 6
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#define MIN_NEEDED_TO 4
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#define MAX_NEEDED_TO 4
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#define ONE_DIRECTION 0
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#define FROM_DIRECTION (dir == from_utf7)
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#define PREPARE_LOOP \
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mbstate_t saved_state; \
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mbstate_t *statep = data->__statep; \
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enum direction dir = ((struct utf7_data *) step->__data)->dir; \
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enum variant var = ((struct utf7_data *) step->__data)->var;
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#define EXTRA_LOOP_ARGS , statep, var
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enum direction
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{
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illegal_dir,
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from_utf7,
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to_utf7
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};
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struct utf7_data
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{
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enum direction dir;
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enum variant var;
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};
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/* Since we might have to reset input pointer we must be able to save
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and restore the state. */
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#define SAVE_RESET_STATE(Save) \
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if (Save) \
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saved_state = *statep; \
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else \
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*statep = saved_state
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int
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gconv_init (struct __gconv_step *step)
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{
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/* Determine which direction. */
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struct utf7_data *new_data;
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enum direction dir = illegal_dir;
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enum variant var = 0;
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for (const char *name = names; *name != '\0';
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name = __rawmemchr (name, '\0') + 1)
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{
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if (__strcasecmp (step->__from_name, name) == 0)
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{
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dir = from_utf7;
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break;
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}
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else if (__strcasecmp (step->__to_name, name) == 0)
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{
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dir = to_utf7;
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break;
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}
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++var;
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}
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if (__glibc_likely (dir != illegal_dir))
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{
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new_data = malloc (sizeof (*new_data));
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if (new_data == NULL)
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return __GCONV_NOMEM;
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new_data->dir = dir;
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new_data->var = var;
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step->__data = new_data;
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if (dir == from_utf7)
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{
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step->__min_needed_from = MIN_NEEDED_FROM;
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step->__max_needed_from = MAX_NEEDED_FROM;
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step->__min_needed_to = MIN_NEEDED_TO;
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step->__max_needed_to = MAX_NEEDED_TO;
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}
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else
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{
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step->__min_needed_from = MIN_NEEDED_TO;
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step->__max_needed_from = MAX_NEEDED_TO;
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step->__min_needed_to = MIN_NEEDED_FROM;
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step->__max_needed_to = MAX_NEEDED_FROM;
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}
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}
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else
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return __GCONV_NOCONV;
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step->__stateful = 1;
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return __GCONV_OK;
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}
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void
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gconv_end (struct __gconv_step *data)
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{
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free (data->__data);
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}
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/* First define the conversion function from UTF-7 to UCS4.
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The state is structured as follows:
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__count bit 2..0: zero
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__count bit 8..3: shift
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__wch: data
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Precise meaning:
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shift data
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0 -- not inside base64 encoding
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1..32 XX..XX00..00 inside base64, (32 - shift) bits pending
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This state layout is simpler than relying on STORE_REST/UNPACK_BYTES.
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When shift = 0, __wch needs to store at most one lookahead byte (see
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__GCONV_INCOMPLETE_INPUT below).
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*/
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#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
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#define MAX_NEEDED_INPUT MAX_NEEDED_FROM
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#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
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#define MAX_NEEDED_OUTPUT MAX_NEEDED_TO
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#define LOOPFCT FROM_LOOP
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#define BODY \
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{ \
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uint_fast8_t ch = *inptr; \
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\
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if ((statep->__count >> 3) == 0) \
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{ \
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/* base64 encoding inactive. */ \
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if (isxdirect (ch, var)) \
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{ \
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inptr++; \
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put32 (outptr, ch); \
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outptr += 4; \
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} \
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else if (__glibc_likely (ch == shift_character (var))) \
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{ \
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if (__glibc_unlikely (inptr + 2 > inend)) \
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{ \
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/* Not enough input available. */ \
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result = __GCONV_INCOMPLETE_INPUT; \
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break; \
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} \
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if (inptr[1] == '-') \
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{ \
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inptr += 2; \
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put32 (outptr, ch); \
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outptr += 4; \
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} \
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else \
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{ \
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/* Switch into base64 mode. */ \
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inptr++; \
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statep->__count = (32 << 3); \
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statep->__value.__wch = 0; \
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} \
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} \
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else \
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{ \
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/* The input is invalid. */ \
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STANDARD_FROM_LOOP_ERR_HANDLER (1); \
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} \
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} \
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else \
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{ \
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/* base64 encoding active. */ \
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uint32_t i; \
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int shift; \
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\
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if (ch >= 'A' && ch <= 'Z') \
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i = ch - 'A'; \
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else if (ch >= 'a' && ch <= 'z') \
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i = ch - 'a' + 26; \
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else if (ch >= '0' && ch <= '9') \
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i = ch - '0' + 52; \
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else if (ch == '+') \
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i = 62; \
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else if ((var == UTF7 && ch == '/') \
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|| (var == UTF_7_IMAP && ch == ',')) \
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i = 63; \
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else \
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{ \
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/* Terminate base64 encoding. */ \
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\
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/* If accumulated data is nonzero, the input is invalid. */ \
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/* Also, partial UTF-16 characters are invalid. */ \
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/* In IMAP variant, must be terminated by '-'. */ \
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if (__glibc_unlikely (statep->__value.__wch != 0) \
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|| __glibc_unlikely ((statep->__count >> 3) <= 26) \
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|| __glibc_unlikely (var == UTF_7_IMAP && ch != '-')) \
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{ \
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STANDARD_FROM_LOOP_ERR_HANDLER ((statep->__count = 0, 1)); \
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} \
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\
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if (ch == '-') \
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inptr++; \
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\
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statep->__count = 0; \
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continue; \
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} \
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\
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/* Concatenate the base64 integer i to the accumulator. */ \
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shift = (statep->__count >> 3); \
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if (shift > 6) \
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{ \
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uint32_t wch; \
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\
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shift -= 6; \
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wch = statep->__value.__wch | (i << shift); \
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\
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if (shift <= 16 && shift > 10) \
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{ \
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/* An UTF-16 character has just been completed. */ \
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uint32_t wc1 = wch >> 16; \
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\
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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 (!(wc1 >= 0xd800 && wc1 < 0xdc00)) \
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{ \
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wch = wch << 16; \
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shift += 16; \
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put32 (outptr, wc1); \
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outptr += 4; \
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} \
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} \
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else if (shift <= 10 && shift > 4) \
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{ \
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/* After a High Surrogate, verify that the next 16 bit \
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indeed form a Low Surrogate. */ \
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uint32_t wc2 = wch & 0xffff; \
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\
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if (! __glibc_likely (wc2 >= 0xdc00 && wc2 < 0xe000)) \
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{ \
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STANDARD_FROM_LOOP_ERR_HANDLER ((statep->__count = 0, 1));\
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} \
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} \
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\
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statep->__value.__wch = wch; \
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} \
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else \
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{ \
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/* An UTF-16 surrogate pair has just been completed. */ \
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uint32_t wc1 = (uint32_t) statep->__value.__wch >> 16; \
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uint32_t wc2 = ((uint32_t) statep->__value.__wch & 0xffff) \
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| (i >> (6 - shift)); \
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\
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statep->__value.__wch = (i << shift) << 26; \
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shift += 26; \
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\
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assert (wc1 >= 0xd800 && wc1 < 0xdc00); \
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assert (wc2 >= 0xdc00 && wc2 < 0xe000); \
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put32 (outptr, \
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0x10000 + ((wc1 - 0xd800) << 10) + (wc2 - 0xdc00)); \
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outptr += 4; \
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} \
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\
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statep->__count = shift << 3; \
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\
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/* Now that we digested the input increment the input pointer. */ \
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inptr++; \
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} \
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}
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#define LOOP_NEED_FLAGS
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#define EXTRA_LOOP_DECLS , mbstate_t *statep, enum variant var
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#include <iconv/loop.c>
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/* Next, define the conversion from UCS4 to UTF-7.
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The state is structured as follows:
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__count bit 2..0: zero
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__count bit 4..3: shift
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__count bit 8..5: 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 next byte
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3 XXXX inside base64, 4 bits known for next byte
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__count bit 2..0 and __wch are always zero, because this direction
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never returns __GCONV_INCOMPLETE_INPUT.
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*/
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#define MIN_NEEDED_INPUT MIN_NEEDED_TO
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#define MAX_NEEDED_INPUT MAX_NEEDED_TO
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#define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM
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#define MAX_NEEDED_OUTPUT MAX_NEEDED_FROM
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#define LOOPFCT TO_LOOP
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#define BODY \
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{ \
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uint32_t ch = get32 (inptr); \
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\
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if ((statep->__count & 0x18) == 0) \
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{ \
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/* base64 encoding inactive */ \
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if (isdirect (ch, var)) \
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{ \
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*outptr++ = (unsigned char) ch; \
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} \
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else \
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{ \
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size_t count; \
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\
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if (ch == shift_character (var)) \
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count = 2; \
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else if (ch < 0x10000) \
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count = 3; \
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else if (ch < 0x110000) \
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count = 6; \
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else \
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STANDARD_TO_LOOP_ERR_HANDLER (4); \
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\
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if (__glibc_unlikely (outptr + count > outend)) \
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{ \
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result = __GCONV_FULL_OUTPUT; \
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break; \
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} \
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\
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*outptr++ = shift_character (var); \
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if (ch == shift_character (var)) \
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*outptr++ = '-'; \
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else if (ch < 0x10000) \
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{ \
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*outptr++ = base64 (ch >> 10, var); \
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*outptr++ = base64 ((ch >> 4) & 0x3f, var); \
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statep->__count = ((ch & 15) << 5) | (3 << 3); \
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} \
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else if (ch < 0x110000) \
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{ \
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uint32_t ch1 = 0xd800 + ((ch - 0x10000) >> 10); \
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uint32_t ch2 = 0xdc00 + ((ch - 0x10000) & 0x3ff); \
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\
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ch = (ch1 << 16) | ch2; \
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*outptr++ = base64 (ch >> 26, var); \
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*outptr++ = base64 ((ch >> 20) & 0x3f, var); \
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*outptr++ = base64 ((ch >> 14) & 0x3f, var); \
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*outptr++ = base64 ((ch >> 8) & 0x3f, var); \
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*outptr++ = base64 ((ch >> 2) & 0x3f, var); \
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statep->__count = ((ch & 3) << 7) | (2 << 3); \
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} \
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else \
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abort (); \
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} \
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} \
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else \
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{ \
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/* base64 encoding active */ \
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if ((var == UTF_7_IMAP && ch == '&') || isdirect (ch, var)) \
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{ \
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/* deactivate base64 encoding */ \
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size_t count; \
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\
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count = ((statep->__count & 0x18) >= 0x10) \
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+ (var == UTF_7_IMAP || needs_explicit_shift (ch)) \
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+ (var == UTF_7_IMAP && ch == '&') \
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+ 1; \
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if (__glibc_unlikely (outptr + count > outend)) \
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{ \
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result = __GCONV_FULL_OUTPUT; \
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break; \
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} \
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\
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if ((statep->__count & 0x18) >= 0x10) \
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*outptr++ = base64 ((statep->__count >> 3) & ~3, var); \
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if (var == UTF_7_IMAP || needs_explicit_shift (ch)) \
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*outptr++ = '-'; \
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*outptr++ = (unsigned char) ch; \
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if (var == UTF_7_IMAP && ch == '&') \
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*outptr++ = '-'; \
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statep->__count = 0; \
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} \
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else \
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{ \
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size_t count; \
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\
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if (ch < 0x10000) \
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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 (__glibc_unlikely (outptr + count > outend)) \
|
|
{ \
|
|
result = __GCONV_FULL_OUTPUT; \
|
|
break; \
|
|
} \
|
|
\
|
|
if (ch < 0x10000) \
|
|
{ \
|
|
switch ((statep->__count >> 3) & 3) \
|
|
{ \
|
|
case 1: \
|
|
*outptr++ = base64 (ch >> 10, var); \
|
|
*outptr++ = base64 ((ch >> 4) & 0x3f, var); \
|
|
statep->__count = ((ch & 15) << 5) | (3 << 3); \
|
|
break; \
|
|
case 2: \
|
|
*outptr++ = \
|
|
base64 (((statep->__count >> 3) & ~3) | (ch >> 12), \
|
|
var); \
|
|
*outptr++ = base64 ((ch >> 6) & 0x3f, var); \
|
|
*outptr++ = base64 (ch & 0x3f, var); \
|
|
statep->__count = (1 << 3); \
|
|
break; \
|
|
case 3: \
|
|
*outptr++ = \
|
|
base64 (((statep->__count >> 3) & ~3) | (ch >> 14), \
|
|
var); \
|
|
*outptr++ = base64 ((ch >> 8) & 0x3f, var); \
|
|
*outptr++ = base64 ((ch >> 2) & 0x3f, var); \
|
|
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, var); \
|
|
*outptr++ = base64 ((ch >> 20) & 0x3f, var); \
|
|
*outptr++ = base64 ((ch >> 14) & 0x3f, var); \
|
|
*outptr++ = base64 ((ch >> 8) & 0x3f, var); \
|
|
*outptr++ = base64 ((ch >> 2) & 0x3f, var); \
|
|
statep->__count = ((ch & 3) << 7) | (2 << 3); \
|
|
break; \
|
|
case 2: \
|
|
*outptr++ = \
|
|
base64 (((statep->__count >> 3) & ~3) | (ch >> 28), \
|
|
var); \
|
|
*outptr++ = base64 ((ch >> 22) & 0x3f, var); \
|
|
*outptr++ = base64 ((ch >> 16) & 0x3f, var); \
|
|
*outptr++ = base64 ((ch >> 10) & 0x3f, var); \
|
|
*outptr++ = base64 ((ch >> 4) & 0x3f, var); \
|
|
statep->__count = ((ch & 15) << 5) | (3 << 3); \
|
|
break; \
|
|
case 3: \
|
|
*outptr++ = \
|
|
base64 (((statep->__count >> 3) & ~3) | (ch >> 30), \
|
|
var); \
|
|
*outptr++ = base64 ((ch >> 24) & 0x3f, var); \
|
|
*outptr++ = base64 ((ch >> 18) & 0x3f, var); \
|
|
*outptr++ = base64 ((ch >> 12) & 0x3f, var); \
|
|
*outptr++ = base64 ((ch >> 6) & 0x3f, var); \
|
|
*outptr++ = base64 (ch & 0x3f, var); \
|
|
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, enum variant var
|
|
#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 (__glibc_unlikely (outbuf + count > outend)) \
|
|
/* 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, var); \
|
|
*outbuf++ = '-'; \
|
|
\
|
|
data->__statep->__count = 0; \
|
|
} \
|
|
} \
|
|
else \
|
|
data->__statep->__count = 0; \
|
|
}
|
|
|
|
|
|
/* Now define the toplevel functions. */
|
|
#include <iconv/skeleton.c>
|