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|
/* Conversion between UTF-16 and UTF-32 BE/internal.
This module uses the Z9-109 variants of the Convert Unicode
instructions.
Copyright (C) 1997-2009 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-16 big endian byte order mark. */
#define BOM_UTF16 0xfeff
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 1
#define MAX_NEEDED_FROM 4
#define MIN_NEEDED_TO 2
#define MAX_NEEDED_TO 4
#define FROM_LOOP from_utf8_loop
#define TO_LOOP to_utf8_loop
#define FROM_DIRECTION (dir == from_utf8)
#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 UTF-16 Byte Order Mark. */ \
if (__builtin_expect (outbuf + 2 > outend, 0)) \
return __GCONV_FULL_OUTPUT; \
\
put16u (outbuf, BOM_UTF16); \
outbuf += 2; \
}
/* 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-16//") == 0);
if (__strcasecmp (step->__from_name, "ISO-10646/UTF8/") == 0
&& (__strcasecmp (step->__to_name, "UTF-16//") == 0
|| __strcasecmp (step->__to_name, "UTF-16BE//") == 0))
{
dir = from_utf8;
}
else if (__strcasecmp (step->__from_name, "UTF-16BE//") == 0
&& __strcasecmp (step->__to_name, "ISO-10646/UTF8/") == 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-16. */
#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 implementation is based on the code in gconv_simple.c. */
#define BODY \
{ \
if (GLRO (dl_hwcap) & HWCAP_S390_ETF3EH) \
{ \
HARDWARE_CONVERT ("cu12 %0, %1, 1"); \
\
if (inptr != inend) \
{ \
int i; \
for (i = 1; inptr + i < inend; ++i) \
if ((inptr[i] & 0xc0) != 0x80) \
break; \
\
if (__builtin_expect (inptr + i == inend, 1)) \
{ \
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
STANDARD_FROM_LOOP_ERR_HANDLER (i); \
} \
continue; \
} \
\
/* Next input byte. */ \
uint16_t ch = *inptr; \
\
if (__builtin_expect (ch < 0x80, 1)) \
{ \
/* 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 (__builtin_expect ((ch & 0xf0) == 0xe0, 1)) \
{ \
/* We expect three bytes. */ \
cnt = 3; \
ch &= 0x0f; \
} \
else if (__builtin_expect ((ch & 0xf8) == 0xf0, 1)) \
{ \
/* We expect four bytes. */ \
cnt = 4; \
ch &= 0x07; \
} \
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 (__builtin_expect (inptr + cnt > inend, 0)) \
{ \
/* 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 (__builtin_expect (inptr + i == inend, 1)) \
{ \
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
\
goto errout; \
} \
\
if (cnt == 4) \
{ \
/* For 4 byte UTF-8 chars two UTF-16 chars (high and \
low) are needed. */ \
uint16_t zabcd, high, low; \
\
if (__builtin_expect (outptr + 4 > outend, 0)) \
{ \
/* Overflow in the output buffer. */ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
\
/* See Principles of Operations cu12. */ \
zabcd = (((inptr[0] & 0x7) << 2) | \
((inptr[1] & 0x30) >> 4)) - 1; \
\
/* z-bit must be zero after subtracting 1. */ \
if (zabcd & 0x10) \
STANDARD_FROM_LOOP_ERR_HANDLER (4) \
\
high = (uint16_t)(0xd8 << 8); /* high surrogate id */ \
high |= zabcd << 6; /* abcd bits */ \
high |= (inptr[1] & 0xf) << 2; /* efgh bits */ \
high |= (inptr[2] & 0x30) >> 4; /* ij bits */ \
\
low = (uint16_t)(0xdc << 8); /* low surrogate id */ \
low |= ((uint16_t)inptr[2] & 0xc) << 6; /* kl bits */ \
low |= (inptr[2] & 0x3) << 6; /* mn bits */ \
low |= inptr[3] & 0x3f; /* opqrst bits */ \
\
put16 (outptr, high); \
outptr += 2; \
put16 (outptr, low); \
outptr += 2; \
inptr += 4; \
continue; \
} \
else \
{ \
/* Read the possible remaining bytes. */ \
for (i = 1; i < cnt; ++i) \
{ \
uint16_t byte = inptr[i]; \
\
if ((byte & 0xc0) != 0x80) \
/* This is an illegal encoding. */ \
break; \
\
ch <<= 6; \
ch |= byte & 0x3f; \
} \
inptr += cnt; \
\
} \
} \
/* Now adjust the pointers and store the result. */ \
*((uint16_t *) outptr) = ch; \
outptr += sizeof (uint16_t); \
}
#define LOOP_NEED_FLAGS
#include <iconv/loop.c>
/* Conversion from UTF-16 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 is based on the functionality of the S/390
hardware instruction (cu21) as described in the Principles of
Operation. */
#define BODY \
{ \
/* The hardware instruction currently fails to report an error for \
isolated low surrogates so we have to disable the instruction \
until this gets resolved. */ \
if (0) /* (GLRO (dl_hwcap) & HWCAP_S390_ETF3EH) */ \
{ \
HARDWARE_CONVERT ("cu21 %0, %1, 1"); \
if (inptr != inend) \
{ \
/* Check if the third byte is \
a valid start of a UTF-16 surrogate. */ \
if (inend - inptr == 3 && (inptr[3] & 0xfc) != 0xdc) \
STANDARD_TO_LOOP_ERR_HANDLER (3); \
\
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
continue; \
} \
\
uint16_t c = get16 (inptr); \
\
if (__builtin_expect (c <= 0x007f, 1)) \
{ \
/* Single byte UTF-8 char. */ \
*outptr = c & 0xff; \
outptr++; \
} \
else if (c >= 0x0080 && c <= 0x07ff) \
{ \
/* Two byte UTF-8 char. */ \
\
if (__builtin_expect (outptr + 2 > outend, 0)) \
{ \
/* Overflow in the output buffer. */ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
\
outptr[0] = 0xc0; \
outptr[0] |= c >> 6; \
\
outptr[1] = 0x80; \
outptr[1] |= c & 0x3f; \
\
outptr += 2; \
} \
else if ((c >= 0x0800 && c <= 0xd7ff) || c > 0xdfff) \
{ \
/* Three byte UTF-8 char. */ \
\
if (__builtin_expect (outptr + 3 > outend, 0)) \
{ \
/* Overflow in the output buffer. */ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
outptr[0] = 0xe0; \
outptr[0] |= c >> 12; \
\
outptr[1] = 0x80; \
outptr[1] |= (c >> 6) & 0x3f; \
\
outptr[2] = 0x80; \
outptr[2] |= c & 0x3f; \
\
outptr += 3; \
} \
else if (c >= 0xd800 && c <= 0xdbff) \
{ \
/* Four byte UTF-8 char. */ \
uint16_t low, uvwxy; \
\
if (__builtin_expect (outptr + 4 > outend, 0)) \
{ \
/* Overflow in the output buffer. */ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
inptr += 2; \
if (__builtin_expect (inptr + 2 > inend, 0)) \
{ \
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
\
low = get16 (inptr); \
\
if ((low & 0xfc00) != 0xdc00) \
{ \
inptr -= 2; \
STANDARD_TO_LOOP_ERR_HANDLER (2); \
} \
uvwxy = ((c >> 6) & 0xf) + 1; \
outptr[0] = 0xf0; \
outptr[0] |= uvwxy >> 2; \
\
outptr[1] = 0x80; \
outptr[1] |= (uvwxy << 4) & 0x30; \
outptr[1] |= (c >> 2) & 0x0f; \
\
outptr[2] = 0x80; \
outptr[2] |= (c & 0x03) << 4; \
outptr[2] |= (low >> 6) & 0x0f; \
\
outptr[3] = 0x80; \
outptr[3] |= low & 0x3f; \
\
outptr += 4; \
} \
else \
{ \
STANDARD_TO_LOOP_ERR_HANDLER (2); \
} \
inptr += 2; \
}
#define LOOP_NEED_FLAGS
#include <iconv/loop.c>
#include <iconv/skeleton.c>
|
