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428bcea4c8
2000-03-23 Bruno Haible <haible@clisp.cons.org> * iconv/gconv_int.h (__gconv_transform_ucs2little_internal, __gconv_transform_internal_ucs2little): Remove declarations. * iconv/gconv_simple.c (__gconv_transform_ucs2_internal, __gconv_transform_internal_ucs2): Never need to bswap_16. (__gconv_transform_ucs2reverse_internal, __gconv_transform_internal_ucs2reverse): Always need to bswap_16.
477 lines
14 KiB
C
477 lines
14 KiB
C
/* Simple transformations functions.
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Copyright (C) 1997, 1998, 1999, 2000 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>, 1997.
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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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 C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <byteswap.h>
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#include <endian.h>
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#include <errno.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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#include <wchar.h>
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#include <sys/param.h>
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#ifndef EILSEQ
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# define EILSEQ EINVAL
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#endif
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/* These are definitions used by some of the functions for handling
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UTF-8 encoding below. */
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static const uint32_t encoding_mask[] =
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{
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~0x7ff, ~0xffff, ~0x1fffff, ~0x3ffffff
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};
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static const unsigned char encoding_byte[] =
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{
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0xc0, 0xe0, 0xf0, 0xf8, 0xfc
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};
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/* Transform from the internal, UCS4-like format, to UCS4. The
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difference between the internal ucs4 format and the real UCS4
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format is, if any, the endianess. The Unicode/ISO 10646 says that
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unless some higher protocol specifies it differently, the byte
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order is big endian.*/
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#define DEFINE_INIT 0
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#define DEFINE_FINI 0
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#define MIN_NEEDED_FROM 4
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#define MIN_NEEDED_TO 4
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#define FROM_DIRECTION 1
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#define FROM_LOOP internal_ucs4_loop
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#define TO_LOOP internal_ucs4_loop /* This is not used. */
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#define FUNCTION_NAME __gconv_transform_internal_ucs4
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static inline int
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internal_ucs4_loop (const unsigned char **inptrp, const unsigned char *inend,
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unsigned char **outptrp, unsigned char *outend,
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mbstate_t *state, void *data, size_t *converted)
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{
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const unsigned char *inptr = *inptrp;
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unsigned char *outptr = *outptrp;
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size_t n_convert = MIN (inend - inptr, outend - outptr) / 4;
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int result;
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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/* Sigh, we have to do some real work. */
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size_t cnt;
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for (cnt = 0; cnt < n_convert; ++cnt, inptr += 4)
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*((uint32_t *) outptr)++ = bswap_32 (*(uint32_t *) inptr);
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*inptrp = inptr;
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*outptrp = outptr;
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#elif __BYTE_ORDER == __BIG_ENDIAN
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/* Simply copy the data. */
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*inptrp = inptr + n_convert * 4;
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*outptrp = __mempcpy (outptr, inptr, n_convert * 4);
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#else
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# error "This endianess is not supported."
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#endif
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/* Determine the status. */
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if (*outptrp == outend)
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result = __GCONV_FULL_OUTPUT;
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else if (*inptrp == inend)
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result = __GCONV_EMPTY_INPUT;
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else
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result = __GCONV_INCOMPLETE_INPUT;
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return result;
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}
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#include <iconv/skeleton.c>
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/* Similarly for the other byte order. */
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#define DEFINE_INIT 0
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#define DEFINE_FINI 0
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#define MIN_NEEDED_FROM 4
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#define MIN_NEEDED_TO 4
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#define FROM_DIRECTION 1
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#define FROM_LOOP internal_ucs4le_loop
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#define TO_LOOP internal_ucs4le_loop /* This is not used. */
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#define FUNCTION_NAME __gconv_transform_internal_ucs4le
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static inline int
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internal_ucs4le_loop (const unsigned char **inptrp, const unsigned char *inend,
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unsigned char **outptrp, unsigned char *outend,
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mbstate_t *state, void *data, size_t *converted)
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{
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const unsigned char *inptr = *inptrp;
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unsigned char *outptr = *outptrp;
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size_t n_convert = MIN (inend - inptr, outend - outptr) / 4;
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int result;
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#if __BYTE_ORDER == __BIG_ENDIAN
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/* Sigh, we have to do some real work. */
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size_t cnt;
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for (cnt = 0; cnt < n_convert; ++cnt, inptr += 4)
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*((uint32_t *) outptr)++ = bswap_32 (*(uint32_t *) inptr);
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*inptrp = inptr;
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*outptrp = outptr;
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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/* Simply copy the data. */
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*inptrp = inptr + n_convert * 4;
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*outptrp = __mempcpy (outptr, inptr, n_convert * 4);
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#else
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# error "This endianess is not supported."
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#endif
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/* Determine the status. */
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if (*outptrp == outend)
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result = __GCONV_FULL_OUTPUT;
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else if (*inptrp == inend)
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result = __GCONV_EMPTY_INPUT;
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else
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result = __GCONV_INCOMPLETE_INPUT;
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return result;
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}
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#include <iconv/skeleton.c>
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/* Convert from ISO 646-IRV to the internal (UCS4-like) format. */
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#define DEFINE_INIT 0
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#define DEFINE_FINI 0
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#define MIN_NEEDED_FROM 1
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#define MIN_NEEDED_TO 4
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#define FROM_DIRECTION 1
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#define FROM_LOOP ascii_internal_loop
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#define TO_LOOP ascii_internal_loop /* This is not used. */
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#define FUNCTION_NAME __gconv_transform_ascii_internal
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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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if (*inptr > '\x7f') \
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{ \
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/* This is no correct ANSI_X3.4-1968 character. */ \
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result = __GCONV_ILLEGAL_INPUT; \
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break; \
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} \
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\
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/* It's an one byte sequence. */ \
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*((uint32_t *) outptr)++ = *inptr++; \
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}
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#include <iconv/loop.c>
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#include <iconv/skeleton.c>
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/* Convert from the internal (UCS4-like) format to ISO 646-IRV. */
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#define DEFINE_INIT 0
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#define DEFINE_FINI 0
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#define MIN_NEEDED_FROM 4
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#define MIN_NEEDED_TO 1
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#define FROM_DIRECTION 1
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#define FROM_LOOP internal_ascii_loop
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#define TO_LOOP internal_ascii_loop /* This is not used. */
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#define FUNCTION_NAME __gconv_transform_internal_ascii
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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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if (*((uint32_t *) inptr) > 0x7f) \
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{ \
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/* This is no correct ANSI_X3.4-1968 character. */ \
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result = __GCONV_ILLEGAL_INPUT; \
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break; \
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} \
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\
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/* It's an one byte sequence. */ \
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*outptr++ = *((uint32_t *) inptr)++; \
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}
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#include <iconv/loop.c>
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#include <iconv/skeleton.c>
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/* Convert from the internal (UCS4-like) format to UTF-8. */
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#define DEFINE_INIT 0
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#define DEFINE_FINI 0
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#define MIN_NEEDED_FROM 4
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#define MIN_NEEDED_TO 1
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#define MAX_NEEDED_TO 6
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#define FROM_DIRECTION 1
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#define FROM_LOOP internal_utf8_loop
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#define TO_LOOP internal_utf8_loop /* This is not used. */
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#define FUNCTION_NAME __gconv_transform_internal_utf8
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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 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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uint32_t wc = *((uint32_t *) inptr); \
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\
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/* Since we control every character we read this cannot happen. */ \
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assert (wc <= 0x7fffffff); \
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\
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if (wc < 0x80) \
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/* It's an one byte sequence. */ \
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*outptr++ = (unsigned char) wc; \
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else \
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{ \
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size_t step; \
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char *start; \
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\
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for (step = 2; step < 6; ++step) \
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if ((wc & encoding_mask[step - 2]) == 0) \
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break; \
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\
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if (outptr + step >= outend) \
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{ \
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/* Too long. */ \
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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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start = outptr; \
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*outptr = encoding_byte[step - 2]; \
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outptr += step; \
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--step; \
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do \
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{ \
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start[step] = 0x80 | (wc & 0x3f); \
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wc >>= 6; \
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} \
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while (--step > 0); \
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start[0] |= wc; \
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} \
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\
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inptr += 4; \
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}
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#include <iconv/loop.c>
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#include <iconv/skeleton.c>
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/* Convert from UTF-8 to the internal (UCS4-like) format. */
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#define DEFINE_INIT 0
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#define DEFINE_FINI 0
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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 FROM_DIRECTION 1
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#define FROM_LOOP utf8_internal_loop
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#define TO_LOOP utf8_internal_loop /* This is not used. */
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#define FUNCTION_NAME __gconv_transform_utf8_internal
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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 LOOPFCT FROM_LOOP
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#define BODY \
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{ \
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uint32_t ch; \
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uint_fast32_t cnt; \
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uint_fast32_t i; \
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\
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/* Next input byte. */ \
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ch = *inptr; \
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\
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if (ch < 0x80) \
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{ \
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/* One byte sequence. */ \
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cnt = 1; \
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++inptr; \
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} \
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else \
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{ \
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if (ch >= 0xc2 && ch < 0xe0) \
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{ \
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/* We expect two bytes. The first byte cannot be 0xc0 or 0xc1, \
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otherwise the wide character could have been represented \
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using a single byte. */ \
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cnt = 2; \
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ch &= 0x1f; \
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} \
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else if ((ch & 0xf0) == 0xe0) \
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{ \
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/* We expect three bytes. */ \
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cnt = 3; \
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ch &= 0x0f; \
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} \
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else if ((ch & 0xf8) == 0xf0) \
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{ \
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/* We expect four bytes. */ \
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cnt = 4; \
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ch &= 0x07; \
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} \
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else if ((ch & 0xfc) == 0xf8) \
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{ \
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/* We expect five bytes. */ \
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cnt = 5; \
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ch &= 0x03; \
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} \
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else if ((ch & 0xfe) == 0xfc) \
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{ \
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/* We expect six bytes. */ \
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cnt = 6; \
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ch &= 0x01; \
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} \
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else \
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{ \
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/* This is an illegal encoding. */ \
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result = __GCONV_ILLEGAL_INPUT; \
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break; \
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} \
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\
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if (NEED_LENGTH_TEST && inptr + cnt > inend) \
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{ \
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/* We don't have enough input. */ \
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result = __GCONV_INCOMPLETE_INPUT; \
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break; \
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} \
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\
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/* Read the possible remaining bytes. */ \
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for (i = 1; i < cnt; ++i) \
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{ \
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uint32_t byte = inptr[i]; \
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\
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if ((byte & 0xc0) != 0x80) \
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/* This is an illegal encoding. */ \
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break; \
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\
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ch <<= 6; \
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ch |= byte & 0x3f; \
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} \
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\
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/* If i < cnt, some trail byte was not >= 0x80, < 0xc0. \
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If cnt > 2 and ch < 2^(5*cnt-4), the wide character ch could \
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have been represented with fewer than cnt bytes. */ \
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if (i < cnt || (cnt > 2 && (ch >> (5 * cnt - 4)) == 0)) \
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{ \
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/* This is an illegal encoding. */ \
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result = __GCONV_ILLEGAL_INPUT; \
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break; \
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} \
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\
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inptr += cnt; \
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} \
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\
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/* Now adjust the pointers and store the result. */ \
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*((uint32_t *) outptr)++ = ch; \
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}
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#include <iconv/loop.c>
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#include <iconv/skeleton.c>
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/* Convert from UCS2 to the internal (UCS4-like) format. */
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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 1
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#define FROM_LOOP ucs2_internal_loop
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#define TO_LOOP ucs2_internal_loop /* This is not used. */
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#define FUNCTION_NAME __gconv_transform_ucs2_internal
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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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*((uint32_t *) outptr)++ = *((uint16_t *) inptr)++;
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#include <iconv/loop.c>
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#include <iconv/skeleton.c>
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/* Convert from the internal (UCS4-like) format to UCS2. */
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#define DEFINE_INIT 0
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#define DEFINE_FINI 0
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#define MIN_NEEDED_FROM 4
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#define MIN_NEEDED_TO 2
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#define FROM_DIRECTION 1
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#define FROM_LOOP internal_ucs2_loop
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#define TO_LOOP internal_ucs2_loop /* This is not used. */
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#define FUNCTION_NAME __gconv_transform_internal_ucs2
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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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if (*((uint32_t *) inptr) >= 0x10000) \
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{ \
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result = __GCONV_ILLEGAL_INPUT; \
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break; \
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} \
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*((uint16_t *) outptr)++ = *((uint32_t *) inptr)++; \
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}
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#include <iconv/loop.c>
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#include <iconv/skeleton.c>
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/* Convert from UCS2 in other endianness to the internal (UCS4-like) format. */
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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 1
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#define FROM_LOOP ucs2reverse_internal_loop
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#define TO_LOOP ucs2reverse_internal_loop/* This is not used.*/
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#define FUNCTION_NAME __gconv_transform_ucs2reverse_internal
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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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*((uint32_t *) outptr)++ = bswap_16 (*(uint16_t *) inptr); \
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inptr += 2;
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#include <iconv/loop.c>
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#include <iconv/skeleton.c>
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/* Convert from the internal (UCS4-like) format to UCS2 in other endianness. */
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#define DEFINE_INIT 0
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#define DEFINE_FINI 0
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#define MIN_NEEDED_FROM 4
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#define MIN_NEEDED_TO 2
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#define FROM_DIRECTION 1
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#define FROM_LOOP internal_ucs2reverse_loop
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#define TO_LOOP internal_ucs2reverse_loop/* This is not used.*/
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#define FUNCTION_NAME __gconv_transform_internal_ucs2reverse
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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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uint32_t val = *((uint32_t *) inptr); \
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if (val >= 0x10000) \
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{ \
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result = __GCONV_ILLEGAL_INPUT; \
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break; \
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} \
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*((uint16_t *) outptr)++ = bswap_16 (val); \
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inptr += 4; \
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}
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#include <iconv/loop.c>
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#include <iconv/skeleton.c>
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