221 lines
6.3 KiB
C
221 lines
6.3 KiB
C
/* Conversion module for Unicode
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Copyright (C) 1999, 2000-2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <byteswap.h>
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#include <dlfcn.h>
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#include <gconv.h>
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#include <stddef.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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/* This is the Byte Order Mark character (BOM). */
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#define BOM 0xfeff
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/* And in the other endian format. */
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#define BOM_OE 0xfffe
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/* Definitions used in the body of the `gconv' function. */
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#define FROM_LOOP from_unicode_loop
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#define TO_LOOP to_unicode_loop
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#define DEFINE_INIT 0
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#define DEFINE_FINI 0
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#define MIN_NEEDED_FROM 2
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#define MIN_NEEDED_TO 4
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#define FROM_DIRECTION (dir == from_unicode)
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#define PREPARE_LOOP \
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enum direction dir = ((struct unicode_data *) step->__data)->dir; \
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int swap; \
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if (FROM_DIRECTION) \
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{ \
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if (data->__invocation_counter == 0) \
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{ \
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/* We have to find out which byte order the file is encoded in. */ \
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if (inptr + 2 > inend) \
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return (inptr == inend \
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? __GCONV_EMPTY_INPUT : __GCONV_INCOMPLETE_INPUT); \
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\
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if (get16u (inptr) == BOM) \
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/* Simply ignore the BOM character. */ \
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*inptrp = inptr += 2; \
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else if (get16u (inptr) == BOM_OE) \
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{ \
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((struct unicode_data *) step->__data)->swap = 1; \
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*inptrp = inptr += 2; \
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} \
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} \
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} \
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else if (!data->__internal_use && data->__invocation_counter == 0) \
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{ \
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/* Emit the Byte Order Mark. */ \
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if (__builtin_expect (outbuf + 2 > outend, 0)) \
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return __GCONV_FULL_OUTPUT; \
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\
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put16u (outbuf, BOM); \
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outbuf += 2; \
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} \
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swap = ((struct unicode_data *) step->__data)->swap;
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#define EXTRA_LOOP_ARGS , swap
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/* Direction of the transformation. */
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enum direction
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{
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illegal_dir,
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to_unicode,
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from_unicode
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};
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struct unicode_data
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{
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enum direction dir;
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int swap;
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};
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extern int gconv_init (struct __gconv_step *step);
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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 unicode_data *new_data;
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enum direction dir = illegal_dir;
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int result;
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if (strcmp (step->__from_name, "UNICODE//") == 0)
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dir = from_unicode;
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else
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dir = to_unicode;
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new_data = (struct unicode_data *) malloc (sizeof (struct unicode_data));
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result = __GCONV_NOMEM;
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if (new_data != NULL)
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{
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new_data->dir = dir;
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new_data->swap = 0;
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step->__data = new_data;
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if (dir == from_unicode)
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{
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step->__min_needed_from = MIN_NEEDED_FROM;
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step->__max_needed_from = MIN_NEEDED_FROM;
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step->__min_needed_to = MIN_NEEDED_TO;
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step->__max_needed_to = MIN_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 = MIN_NEEDED_TO;
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step->__min_needed_to = MIN_NEEDED_FROM;
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step->__max_needed_to = MIN_NEEDED_FROM;
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}
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step->__stateful = 0;
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result = __GCONV_OK;
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}
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return result;
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}
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extern void gconv_end (struct __gconv_step *data);
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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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/* Convert from the internal (UCS4-like) format to UCS2. */
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#define MIN_NEEDED_INPUT MIN_NEEDED_TO
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#define MIN_NEEDED_OUTPUT MIN_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 c = get32 (inptr); \
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\
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if (__builtin_expect (c >= 0x10000, 0)) \
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{ \
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UNICODE_TAG_HANDLER (c, 4); \
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STANDARD_TO_LOOP_ERR_HANDLER (4); \
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} \
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else if (__builtin_expect (c >= 0xd800 && c < 0xe000, 0)) \
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{ \
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/* Surrogate characters in UCS-4 input are not valid. \
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We must catch this, because the UCS-2 output might be \
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interpreted as UTF-16 by other programs. If we let \
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surrogates pass through, attackers could make a security \
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hole exploit by synthesizing any desired plane 1-16 \
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character. */ \
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result = __GCONV_ILLEGAL_INPUT; \
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if (! ignore_errors_p ()) \
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break; \
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inptr += 4; \
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++*irreversible; \
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continue; \
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} \
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else \
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{ \
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put16 (outptr, c); \
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outptr += 2; \
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} \
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\
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inptr += 4; \
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}
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#define LOOP_NEED_FLAGS
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#define EXTRA_LOOP_DECLS \
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, int swap
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#include <iconv/loop.c>
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/* Convert from UCS2 to the internal (UCS4-like) format. */
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#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
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#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
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#define LOOPFCT FROM_LOOP
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#define BODY \
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{ \
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uint16_t u1 = get16 (inptr); \
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\
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if (swap) \
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u1 = bswap_16 (u1); \
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\
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if (__builtin_expect (u1 >= 0xd800 && u1 < 0xe000, 0)) \
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{ \
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/* Surrogate characters in UCS-2 input are not valid. Reject \
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them. (Catching this here is not security relevant.) */ \
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STANDARD_FROM_LOOP_ERR_HANDLER (2); \
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} \
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\
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put32 (outptr, u1); \
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\
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inptr += 2; \
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outptr += 4; \
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}
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#define LOOP_NEED_FLAGS
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#define EXTRA_LOOP_DECLS \
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, int swap
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#include <iconv/loop.c>
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/* Now define the toplevel functions. */
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#include <iconv/skeleton.c>
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