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|
/* Simple transformations functions.
Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <byteswap.h>
#include <endian.h>
#include <errno.h>
#include <gconv.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <sys/param.h>
#ifndef EILSEQ
# define EILSEQ EINVAL
#endif
/* These are definitions used by some of the functions for handling
UTF-8 encoding below. */
static const uint32_t encoding_mask[] =
{
~0x7ff, ~0xffff, ~0x1fffff, ~0x3ffffff
};
static const unsigned char encoding_byte[] =
{
0xc0, 0xe0, 0xf0, 0xf8, 0xfc
};
/* Transform from the internal, UCS4-like format, to UCS4. The
difference between the internal ucs4 format and the real UCS4
format is, if any, the endianess. The Unicode/ISO 10646 says that
unless some higher protocol specifies it differently, the byte
order is big endian.*/
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 4
#define MIN_NEEDED_TO 4
#define FROM_DIRECTION 1
#define FROM_LOOP internal_ucs4_loop
#define TO_LOOP internal_ucs4_loop /* This is not used. */
#define FUNCTION_NAME __gconv_transform_internal_ucs4
static inline int
internal_ucs4_loop (const unsigned char **inptrp, const unsigned char *inend,
unsigned char **outptrp, unsigned char *outend,
mbstate_t *state, void *data, size_t *converted)
{
const unsigned char *inptr = *inptrp;
unsigned char *outptr = *outptrp;
size_t n_convert = MIN (inend - inptr, outend - outptr) / 4;
int result;
#if __BYTE_ORDER == __LITTLE_ENDIAN
/* Sigh, we have to do some real work. */
size_t cnt;
for (cnt = 0; cnt < n_convert; ++cnt, inptr += 4)
*((uint32_t *) outptr)++ = bswap_32 (*(uint32_t *) inptr);
*inptrp = inptr;
*outptrp = outptr;
#elif __BYTE_ORDER == __BIG_ENDIAN
/* Simply copy the data. */
*inptrp = inptr + n_convert * 4;
*outptrp = __mempcpy (outptr, inptr, n_convert * 4);
#else
# error "This endianess is not supported."
#endif
/* Determine the status. */
if (*outptrp == outend)
result = __GCONV_FULL_OUTPUT;
else if (*inptrp == inend)
result = __GCONV_EMPTY_INPUT;
else
result = __GCONV_INCOMPLETE_INPUT;
if (converted != NULL)
converted += n_convert;
return result;
}
#include <iconv/skeleton.c>
/* Convert from ISO 646-IRV to the internal (UCS4-like) format. */
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 1
#define MIN_NEEDED_TO 4
#define FROM_DIRECTION 1
#define FROM_LOOP ascii_internal_loop
#define TO_LOOP ascii_internal_loop /* This is not used. */
#define FUNCTION_NAME __gconv_transform_ascii_internal
#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
#define LOOPFCT FROM_LOOP
#define BODY \
{ \
if (*inptr > '\x7f') \
{ \
/* This is no correct ANSI_X3.4-1968 character. */ \
result = __GCONV_ILLEGAL_INPUT; \
break; \
} \
\
/* It's an one byte sequence. */ \
*((uint32_t *) outptr)++ = *inptr++; \
}
#include <iconv/loop.c>
#include <iconv/skeleton.c>
/* Convert from the internal (UCS4-like) format to ISO 646-IRV. */
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 4
#define MIN_NEEDED_TO 1
#define FROM_DIRECTION 1
#define FROM_LOOP internal_ascii_loop
#define TO_LOOP internal_ascii_loop /* This is not used. */
#define FUNCTION_NAME __gconv_transform_internal_ascii
#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
#define LOOPFCT FROM_LOOP
#define BODY \
{ \
if (*((uint32_t *) inptr) > 0x7f) \
{ \
/* This is no correct ANSI_X3.4-1968 character. */ \
result = __GCONV_ILLEGAL_INPUT; \
break; \
} \
\
/* It's an one byte sequence. */ \
*outptr++ = *((uint32_t *) inptr)++; \
}
#include <iconv/loop.c>
#include <iconv/skeleton.c>
/* Convert from the internal (UCS4-like) format to UTF-8. */
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 4
#define MIN_NEEDED_TO 1
#define MAX_NEEDED_TO 6
#define FROM_DIRECTION 1
#define FROM_LOOP internal_utf8_loop
#define TO_LOOP internal_utf8_loop /* This is not used. */
#define FUNCTION_NAME __gconv_transform_internal_utf8
#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
#define MAX_NEEDED_OUTPUT MAX_NEEDED_TO
#define LOOPFCT FROM_LOOP
#define BODY \
{ \
uint32_t wc = *((uint32_t *) inptr); \
\
/* Since we control every character we read this cannot happen. */ \
assert (wc <= 0x7fffffff); \
\
if (wc < 0x80) \
/* It's an one byte sequence. */ \
*outptr++ = (unsigned char) wc; \
else \
{ \
size_t step; \
char *start; \
\
for (step = 2; step < 6; ++step) \
if ((wc & encoding_mask[step - 2]) == 0) \
break; \
\
if (outptr + step >= outend) \
{ \
/* Too long. */ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
\
start = outptr; \
*outptr = encoding_byte[step - 2]; \
outptr += step; \
--step; \
do \
{ \
start[step] = 0x80 | (wc & 0x3f); \
wc >>= 6; \
} \
while (--step > 0); \
start[0] |= wc; \
} \
\
inptr += 4; \
}
#include <iconv/loop.c>
#include <iconv/skeleton.c>
/* Convert from UTF-8 to the internal (UCS4-like) format. */
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 1
#define MAX_NEEDED_FROM 6
#define MIN_NEEDED_TO 4
#define FROM_DIRECTION 1
#define FROM_LOOP utf8_internal_loop
#define TO_LOOP utf8_internal_loop /* This is not used. */
#define FUNCTION_NAME __gconv_transform_utf8_internal
#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
#define MAX_NEEDED_INPUT MAX_NEEDED_FROM
#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
#define LOOPFCT FROM_LOOP
#define BODY \
{ \
uint32_t ch; \
uint_fast32_t cnt; \
uint_fast32_t i; \
\
/* Next input byte. */ \
ch = *inptr; \
\
if (ch < 0x80) \
{ \
/* One byte sequence. */ \
cnt = 1; \
++inptr; \
} \
else \
{ \
if (ch >= 0xc2 && ch < 0xe0) \
{ \
/* We expect two bytes. The first byte cannot be 0xc0 or 0xc1, \
otherwise the wide character could have been represented \
using a single byte. */ \
cnt = 2; \
ch &= 0x1f; \
} \
else if ((ch & 0xf0) == 0xe0) \
{ \
/* We expect three bytes. */ \
cnt = 3; \
ch &= 0x0f; \
} \
else if ((ch & 0xf8) == 0xf0) \
{ \
/* We expect four bytes. */ \
cnt = 4; \
ch &= 0x07; \
} \
else if ((ch & 0xfc) == 0xf8) \
{ \
/* We expect five bytes. */ \
cnt = 5; \
ch &= 0x03; \
} \
else if ((ch & 0xfe) == 0xfc) \
{ \
/* We expect six bytes. */ \
cnt = 6; \
ch &= 0x01; \
} \
else \
{ \
/* This is an illegal encoding. */ \
result = __GCONV_ILLEGAL_INPUT; \
break; \
} \
\
if (NEED_LENGTH_TEST && inptr + cnt > inend) \
{ \
/* We don't have enough input. */ \
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
\
/* Read the possible remaining bytes. */ \
for (i = 1; i < cnt; ++i) \
{ \
uint32_t byte = inptr[i]; \
\
if ((byte & 0xc0) != 0x80) \
/* This is an illegal encoding. */ \
break; \
\
ch <<= 6; \
ch |= byte & 0x3f; \
} \
\
/* If i < cnt, some trail byte was not >= 0x80, < 0xc0. \
If cnt > 2 and ch < 2^(5*cnt-4), the wide character ch could \
have been represented with fewer than cnt bytes. */ \
if (i < cnt || (cnt > 2 && (ch >> (5 * cnt - 4)) == 0)) \
{ \
/* This is an illegal encoding. */ \
result = __GCONV_ILLEGAL_INPUT; \
break; \
} \
\
inptr += cnt; \
} \
\
/* Now adjust the pointers and store the result. */ \
*((uint32_t *) outptr)++ = ch; \
}
#include <iconv/loop.c>
#include <iconv/skeleton.c>
/* Convert from UCS2 to the internal (UCS4-like) format. */
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 2
#define MIN_NEEDED_TO 4
#define FROM_DIRECTION 1
#define FROM_LOOP ucs2_internal_loop
#define TO_LOOP ucs2_internal_loop /* This is not used. */
#define FUNCTION_NAME __gconv_transform_ucs2_internal
#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
#define LOOPFCT FROM_LOOP
#if __BYTE_ORDER == __LITTLE_ENDIAN
# define BODY \
*((uint32_t *) outptr)++ = bswap_16 (*(uint16_t *) inptr); \
inptr += 2;
#else
# define BODY \
*((uint32_t *) outptr)++ = *((uint16_t *) inptr)++;
#endif
#include <iconv/loop.c>
#include <iconv/skeleton.c>
/* Convert from the internal (UCS4-like) format to UCS2. */
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 4
#define MIN_NEEDED_TO 2
#define FROM_DIRECTION 1
#define FROM_LOOP internal_ucs2_loop
#define TO_LOOP internal_ucs2_loop /* This is not used. */
#define FUNCTION_NAME __gconv_transform_internal_ucs2
#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
#define LOOPFCT FROM_LOOP
#if __BYTE_ORDER == __LITTLE_ENDIAN
# define BODY \
{ \
if (*((uint32_t *) inptr) >= 0x10000) \
{ \
result = __GCONV_ILLEGAL_INPUT; \
break; \
} \
/* Please note that we use the `uint32_t' from-pointer as an `uint16_t' \
pointer which works since we are on a little endian machine. */ \
*((uint16_t *) outptr)++ = bswap_16 (*((uint16_t *) inptr)); \
inptr += 4; \
}
#else
# define BODY \
{ \
if (*((uint32_t *) inptr) >= 0x10000) \
{ \
result = __GCONV_ILLEGAL_INPUT; \
break; \
} \
*((uint16_t *) outptr)++ = *((uint32_t *) inptr)++; \
}
#endif
#include <iconv/loop.c>
#include <iconv/skeleton.c>
/* Convert from UCS2 in little endian to the internal (UCS4-like) format. */
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 2
#define MIN_NEEDED_TO 4
#define FROM_DIRECTION 1
#define FROM_LOOP ucs2little_internal_loop
#define TO_LOOP ucs2little_internal_loop /* This is not used.*/
#define FUNCTION_NAME __gconv_transform_ucs2little_internal
#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
#define LOOPFCT FROM_LOOP
#if __BYTE_ORDER == __LITTLE_ENDIAN
# define BODY \
*((uint32_t *) outptr)++ = *((uint16_t *) inptr)++;
#else
# define BODY \
*((uint32_t *) outptr)++ = bswap_16 (*(uint16_t *) inptr); \
inptr += 2;
#endif
#include <iconv/loop.c>
#include <iconv/skeleton.c>
/* Convert from the internal (UCS4-like) format to UCS2 in little endian. */
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 4
#define MIN_NEEDED_TO 2
#define FROM_DIRECTION 1
#define FROM_LOOP internal_ucs2little_loop
#define TO_LOOP internal_ucs2little_loop /* This is not used.*/
#define FUNCTION_NAME __gconv_transform_internal_ucs2little
#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
#define LOOPFCT FROM_LOOP
#if __BYTE_ORDER == __LITTLE_ENDIAN
# define BODY \
{ \
if (*((uint32_t *) inptr) >= 0x10000) \
{ \
result = __GCONV_ILLEGAL_INPUT; \
break; \
} \
*((uint16_t *) outptr)++ = *((uint32_t *) inptr)++; \
}
#else
# define BODY \
{ \
if (*((uint32_t *) inptr) >= 0x10000) \
{ \
result = __GCONV_ILLEGAL_INPUT; \
break; \
} \
*((uint16_t *) outptr)++ = bswap_16 (((uint16_t *) inptr)[1]); \
inptr += 4; \
}
#endif
#include <iconv/loop.c>
#include <iconv/skeleton.c>
/* Convert from the internal (UCS4-like) format to UTF-16. */
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 4
#define MIN_NEEDED_TO 2
#define MAX_NEEDED_TO 4
#define FROM_DIRECTION 1
#define FROM_LOOP internal_utf16_loop
#define TO_LOOP internal_utf16_loop /* This is not used. */
#define FUNCTION_NAME __gconv_transform_internal_utf16
#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
#define MAX_NEEDED_OUTPUT MAX_NEEDED_TO
#define LOOPFCT FROM_LOOP
#if __BYTE_ORDER == __LITTLE_ENDIAN
# define BODY \
{ \
if (*((uint32_t *) inptr) >= 0x10000) \
{ \
if (*((uint32_t *) inptr) >= 0x110000) \
{ \
result = __GCONV_ILLEGAL_INPUT; \
break; \
} \
\
/* Generate a surrogate character. */ \
if (NEED_LENGTH_TEST && outptr + 4 > outend) \
{ \
/* Overflow in the output buffer. */ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
\
*((uint16_t *) outptr)++ = bswap_16 (0xd7c0 \
+ (*((uint32_t *) inptr) >> 10));\
*((uint16_t *) outptr)++ = bswap_16 (0xdc00 \
+ (*((uint32_t *) inptr) \
& 0x3ff)); \
} \
else \
/* Please note that we use the `uint32_t' from-pointer as an `uint16_t' \
pointer which works since we are on a little endian machine. */ \
*((uint16_t *) outptr)++ = bswap_16 (*((uint16_t *) inptr)); \
inptr += 4; \
}
#else
# define BODY \
{ \
if (*((uint32_t *) inptr) >= 0x10000) \
{ \
if (*((uint32_t *) inptr) >= 0x110000) \
{ \
result = __GCONV_ILLEGAL_INPUT; \
break; \
} \
\
/* Generate a surrogate character. */ \
if (NEED_LENGTH_TEST && outptr + 4 > outend) \
{ \
/* Overflow in the output buffer. */ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
\
*((uint16_t *) outptr)++ = 0xd7c0 + (*((uint32_t *) inptr) >> 10); \
*((uint16_t *) outptr)++ = 0xdc00 + (*((uint32_t *) inptr) & 0x3ff); \
} \
else \
*((uint16_t *) outptr)++ = *((uint32_t *) inptr)++; \
}
#endif
#include <iconv/loop.c>
#include <iconv/skeleton.c>
/* Convert from UTF-16 to the internal (UCS4-like) format. */
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 2
#define MAX_NEEDED_FROM 4
#define MIN_NEEDED_TO 4
#define FROM_DIRECTION 1
#define FROM_LOOP utf16_internal_loop
#define TO_LOOP utf16_internal_loop /* This is not used.*/
#define FUNCTION_NAME __gconv_transform_utf16_internal
#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
#define MAX_NEEDED_INPUT MAX_NEEDED_FROM
#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
#define LOOPFCT FROM_LOOP
#if __BYTE_ORDER == __LITTLE_ENDIAN
# define BODY \
{ \
uint16_t u1 = bswap_16 (*(uint16_t *) inptr); \
\
if (u1 < 0xd800 || u1 > 0xdfff) \
{ \
/* No surrogate. */ \
*((uint32_t *) outptr)++ = u1; \
inptr += 2; \
} \
else \
{ \
uint16_t u2; \
\
/* It's a surrogate character. At least the first word says \
it is. */ \
if (NEED_LENGTH_TEST && inptr + 4 > inend) \
{ \
/* We don't have enough input for another complete input \
character. */ \
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
\
u2 = bswap_16 (((uint16_t *) inptr)[1]); \
if (u2 < 0xdc00 || u2 >= 0xdfff) \
{ \
/* This is no valid second word for a surrogate. */ \
result = __GCONV_ILLEGAL_INPUT; \
break; \
} \
\
*((uint32_t *) outptr)++ = ((u1 - 0xd7c0) << 10) + (u2 - 0xdc00); \
inptr += 4; \
} \
}
#else
# define BODY \
{ \
uint16_t u1 = *(uint16_t *) inptr; \
\
if (u1 < 0xd800 || u1 > 0xdfff) \
{ \
/* No surrogate. */ \
*((uint32_t *) outptr)++ = u1; \
inptr += 2; \
} \
else \
{ \
uint16_t u2; \
\
/* It's a surrogate character. At least the first word says \
it is. */ \
if (NEED_LENGTH_TEST && inptr + 4 > inend) \
{ \
/* We don't have enough input for another complete input \
character. */ \
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
\
u2 = ((uint16_t *) inptr)[1]; \
if (u2 < 0xdc00 || u2 >= 0xdfff) \
{ \
/* This is no valid second word for a surrogate. */ \
result = __GCONV_ILLEGAL_INPUT; \
break; \
} \
\
*((uint32_t *) outptr)++ = ((u1 - 0xd7c0) << 10) + (u2 - 0xdc00); \
inptr += 4; \
} \
}
#endif
#include <iconv/loop.c>
#include <iconv/skeleton.c>
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