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glibc/sysdeps/s390/s390-64/utf8-utf32-z9.c

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/* Conversion between UTF-8 and UTF-32 BE/internal.
This module uses the Z9-109 variants of the Convert Unicode
instructions.
Copyright (C) 1997-2015 Free Software Foundation, Inc.
Author: Andreas Krebbel <Andreas.Krebbel@de.ibm.com>
Based on the work by Ulrich Drepper <drepper@cygnus.com>, 1997.
Thanks to Daniel Appich who covered the relevant performance work
in his diploma thesis.
This is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <dlfcn.h>
#include <stdint.h>
#include <unistd.h>
#include <dl-procinfo.h>
#include <gconv.h>
/* UTF-32 big endian byte order mark. */
#define BOM 0x0000feffu
#define DEFINE_INIT 0
#define DEFINE_FINI 0
/* These definitions apply to the UTF-8 to UTF-32 direction. The
software implementation for UTF-8 still supports multibyte
characters up to 6 bytes whereas the hardware variant does not. */
#define MIN_NEEDED_FROM 1
#define MAX_NEEDED_FROM 6
#define MIN_NEEDED_TO 4
#define FROM_LOOP from_utf8_loop
#define TO_LOOP to_utf8_loop
#define FROM_DIRECTION (dir == from_utf8)
#define ONE_DIRECTION 0
#define PREPARE_LOOP \
enum direction dir = ((struct utf8_data *) step->__data)->dir; \
int emit_bom = ((struct utf8_data *) step->__data)->emit_bom; \
\
if (emit_bom && !data->__internal_use \
&& data->__invocation_counter == 0) \
{ \
/* Emit the Byte Order Mark. */ \
if (__glibc_unlikely (outbuf + 4 > outend)) \
return __GCONV_FULL_OUTPUT; \
\
put32u (outbuf, BOM); \
outbuf += 4; \
}
/* Direction of the transformation. */
enum direction
{
illegal_dir,
to_utf8,
from_utf8
};
struct utf8_data
{
enum direction dir;
int emit_bom;
};
extern int gconv_init (struct __gconv_step *step);
int
gconv_init (struct __gconv_step *step)
{
/* Determine which direction. */
struct utf8_data *new_data;
enum direction dir = illegal_dir;
int emit_bom;
int result;
emit_bom = (__strcasecmp (step->__to_name, "UTF-32//") == 0);
if (__strcasecmp (step->__from_name, "ISO-10646/UTF8/") == 0
&& (__strcasecmp (step->__to_name, "UTF-32//") == 0
|| __strcasecmp (step->__to_name, "UTF-32BE//") == 0
|| __strcasecmp (step->__to_name, "INTERNAL") == 0))
{
dir = from_utf8;
}
else if (__strcasecmp (step->__to_name, "ISO-10646/UTF8/") == 0
&& (__strcasecmp (step->__from_name, "UTF-32BE//") == 0
|| __strcasecmp (step->__from_name, "INTERNAL") == 0))
{
dir = to_utf8;
}
result = __GCONV_NOCONV;
if (dir != illegal_dir)
{
new_data = (struct utf8_data *) malloc (sizeof (struct utf8_data));
result = __GCONV_NOMEM;
if (new_data != NULL)
{
new_data->dir = dir;
new_data->emit_bom = emit_bom;
step->__data = new_data;
if (dir == from_utf8)
{
step->__min_needed_from = MIN_NEEDED_FROM;
step->__max_needed_from = MIN_NEEDED_FROM;
step->__min_needed_to = MIN_NEEDED_TO;
step->__max_needed_to = MIN_NEEDED_TO;
}
else
{
step->__min_needed_from = MIN_NEEDED_TO;
step->__max_needed_from = MIN_NEEDED_TO;
step->__min_needed_to = MIN_NEEDED_FROM;
step->__max_needed_to = MIN_NEEDED_FROM;
}
step->__stateful = 0;
result = __GCONV_OK;
}
}
return result;
}
extern void gconv_end (struct __gconv_step *data);
void
gconv_end (struct __gconv_step *data)
{
free (data->__data);
}
/* The macro for the hardware loop. This is used for both
directions. */
#define HARDWARE_CONVERT(INSTRUCTION) \
{ \
register const unsigned char* pInput asm ("8") = inptr; \
register unsigned long long inlen asm ("9") = inend - inptr; \
register unsigned char* pOutput asm ("10") = outptr; \
register unsigned long long outlen asm("11") = outend - outptr; \
uint64_t cc = 0; \
\
asm volatile (".machine push \n\t" \
".machine \"z9-109\" \n\t" \
"0: " INSTRUCTION " \n\t" \
".machine pop \n\t" \
" jo 0b \n\t" \
" ipm %2 \n" \
: "+a" (pOutput), "+a" (pInput), "+d" (cc), \
"+d" (outlen), "+d" (inlen) \
: \
: "cc", "memory"); \
\
inptr = pInput; \
outptr = pOutput; \
cc >>= 28; \
\
if (cc == 1) \
{ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
else if (cc == 2) \
{ \
result = __GCONV_ILLEGAL_INPUT; \
break; \
} \
}
/* Conversion function from UTF-8 to UTF-32 internal/BE. */
#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
/* The software routine is copied from gconv_simple.c. */
#define BODY \
{ \
if (GLRO (dl_hwcap) & HWCAP_S390_ETF3EH) \
{ \
HARDWARE_CONVERT ("cu14 %0, %1, 1"); \
\
if (inptr != inend) \
{ \
int i; \
for (i = 1; inptr + i < inend; ++i) \
if ((inptr[i] & 0xc0) != 0x80) \
break; \
\
if (__glibc_likely (inptr + i == inend)) \
{ \
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
STANDARD_FROM_LOOP_ERR_HANDLER (i); \
} \
continue; \
} \
\
/* Next input byte. */ \
uint32_t ch = *inptr; \
\
if (__glibc_likely (ch < 0x80)) \
{ \
/* One byte sequence. */ \
++inptr; \
} \
else \
{ \
uint_fast32_t cnt; \
uint_fast32_t i; \
\
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 (__glibc_likely ((ch & 0xf0) == 0xe0)) \
{ \
/* We expect three bytes. */ \
cnt = 3; \
ch &= 0x0f; \
} \
else if (__glibc_likely ((ch & 0xf8) == 0xf0)) \
{ \
/* We expect four bytes. */ \
cnt = 4; \
ch &= 0x07; \
} \
else if (__glibc_likely ((ch & 0xfc) == 0xf8)) \
{ \
/* We expect five bytes. */ \
cnt = 5; \
ch &= 0x03; \
} \
else if (__glibc_likely ((ch & 0xfe) == 0xfc)) \
{ \
/* We expect six bytes. */ \
cnt = 6; \
ch &= 0x01; \
} \
else \
{ \
/* Search the end of this ill-formed UTF-8 character. This \
is the next byte with (x & 0xc0) != 0x80. */ \
i = 0; \
do \
++i; \
while (inptr + i < inend \
&& (*(inptr + i) & 0xc0) == 0x80 \
&& i < 5); \
\
errout: \
STANDARD_FROM_LOOP_ERR_HANDLER (i); \
} \
\
if (__glibc_unlikely (inptr + cnt > inend)) \
{ \
/* We don't have enough input. But before we report \
that check that all the bytes are correct. */ \
for (i = 1; inptr + i < inend; ++i) \
if ((inptr[i] & 0xc0) != 0x80) \
break; \
\
if (__glibc_likely (inptr + i == inend)) \
{ \
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
\
goto errout; \
} \
\
/* 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. */ \
goto errout; \
} \
\
inptr += cnt; \
} \
\
/* Now adjust the pointers and store the result. */ \
*((uint32_t *) outptr) = ch; \
outptr += sizeof (uint32_t); \
}
#define LOOP_NEED_FLAGS
#define STORE_REST \
{ \
/* We store the remaining bytes while converting them into the UCS4 \
format. We can assume that the first byte in the buffer is \
correct and that it requires a larger number of bytes than there \
are in the input buffer. */ \
wint_t ch = **inptrp; \
size_t cnt, r; \
\
state->__count = inend - *inptrp; \
\
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 (__glibc_likely ((ch & 0xf0) == 0xe0)) \
{ \
/* We expect three bytes. */ \
cnt = 3; \
ch &= 0x0f; \
} \
else if (__glibc_likely ((ch & 0xf8) == 0xf0)) \
{ \
/* We expect four bytes. */ \
cnt = 4; \
ch &= 0x07; \
} \
else if (__glibc_likely ((ch & 0xfc) == 0xf8)) \
{ \
/* We expect five bytes. */ \
cnt = 5; \
ch &= 0x03; \
} \
else \
{ \
/* We expect six bytes. */ \
cnt = 6; \
ch &= 0x01; \
} \
\
/* The first byte is already consumed. */ \
r = cnt - 1; \
while (++(*inptrp) < inend) \
{ \
ch <<= 6; \
ch |= **inptrp & 0x3f; \
--r; \
} \
\
/* Shift for the so far missing bytes. */ \
ch <<= r * 6; \
\
/* Store the number of bytes expected for the entire sequence. */ \
state->__count |= cnt << 8; \
\
/* Store the value. */ \
state->__value.__wch = ch; \
}
#define UNPACK_BYTES \
{ \
static const unsigned char inmask[5] = { 0xc0, 0xe0, 0xf0, 0xf8, 0xfc }; \
wint_t wch = state->__value.__wch; \
size_t ntotal = state->__count >> 8; \
\
inlen = state->__count & 255; \
\
bytebuf[0] = inmask[ntotal - 2]; \
\
do \
{ \
if (--ntotal < inlen) \
bytebuf[ntotal] = 0x80 | (wch & 0x3f); \
wch >>= 6; \
} \
while (ntotal > 1); \
\
bytebuf[0] |= wch; \
}
#define CLEAR_STATE \
state->__count = 0
#include <iconv/loop.c>
/* Conversion from UTF-32 internal/BE to UTF-8. */
#define MIN_NEEDED_INPUT MIN_NEEDED_TO
#define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM
#define MAX_NEEDED_OUTPUT MAX_NEEDED_FROM
#define LOOPFCT TO_LOOP
/* The software routine mimics the S/390 cu41 instruction. */
#define BODY \
{ \
if (GLRO (dl_hwcap) & HWCAP_S390_ETF3EH) \
{ \
HARDWARE_CONVERT ("cu41 %0, %1"); \
\
if (inptr != inend) \
{ \
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
continue; \
} \
\
uint32_t wc = *((const uint32_t *) inptr); \
\
if (__glibc_likely (wc <= 0x7f)) \
{ \
/* Single UTF-8 char. */ \
*outptr = (uint8_t)wc; \
outptr++; \
} \
else if (wc <= 0x7ff) \
{ \
/* Two UTF-8 chars. */ \
if (__glibc_unlikely (outptr + 2 > outend)) \
{ \
/* Overflow in the output buffer. */ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
\
outptr[0] = 0xc0; \
outptr[0] |= wc >> 6; \
\
outptr[1] = 0x80; \
outptr[1] |= wc & 0x3f; \
\
outptr += 2; \
} \
else if (wc <= 0xffff) \
{ \
/* Three UTF-8 chars. */ \
if (__glibc_unlikely (outptr + 3 > outend)) \
{ \
/* Overflow in the output buffer. */ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
outptr[0] = 0xe0; \
outptr[0] |= wc >> 12; \
\
outptr[1] = 0x80; \
outptr[1] |= (wc >> 6) & 0x3f; \
\
outptr[2] = 0x80; \
outptr[2] |= wc & 0x3f; \
\
outptr += 3; \
} \
else if (wc <= 0x10ffff) \
{ \
/* Four UTF-8 chars. */ \
if (__glibc_unlikely (outptr + 4 > outend)) \
{ \
/* Overflow in the output buffer. */ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
outptr[0] = 0xf0; \
outptr[0] |= wc >> 18; \
\
outptr[1] = 0x80; \
outptr[1] |= (wc >> 12) & 0x3f; \
\
outptr[2] = 0x80; \
outptr[2] |= (wc >> 6) & 0x3f; \
\
outptr[3] = 0x80; \
outptr[3] |= wc & 0x3f; \
\
outptr += 4; \
} \
else \
{ \
STANDARD_TO_LOOP_ERR_HANDLER (4); \
} \
inptr += 4; \
}
#define LOOP_NEED_FLAGS
#include <iconv/loop.c>
#include <iconv/skeleton.c>
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