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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) 1997-2014 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_UTF32 0x0000feffu
/* UTF-16 big endian byte order mark. */
#define BOM_UTF16 0xfeff
#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_LOOP from_utf16_loop
#define TO_LOOP to_utf16_loop
#define FROM_DIRECTION (dir == from_utf16)
#define PREPARE_LOOP \
enum direction dir = ((struct utf16_data *) step->__data)->dir; \
int emit_bom = ((struct utf16_data *) step->__data)->emit_bom; \
\
if (emit_bom && !data->__internal_use \
&& data->__invocation_counter == 0) \
{ \
if (dir == to_utf16) \
{ \
/* Emit the UTF-16 Byte Order Mark. */ \
if (__glibc_unlikely (outbuf + 2 > outend)) \
return __GCONV_FULL_OUTPUT; \
\
put16u (outbuf, BOM_UTF16); \
outbuf += 2; \
} \
else \
{ \
/* Emit the UTF-32 Byte Order Mark. */ \
if (__glibc_unlikely (outbuf + 4 > outend)) \
return __GCONV_FULL_OUTPUT; \
\
put32u (outbuf, BOM_UTF32); \
outbuf += 4; \
} \
}
/* Direction of the transformation. */
enum direction
{
illegal_dir,
to_utf16,
from_utf16
};
struct utf16_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 utf16_data *new_data;
enum direction dir = illegal_dir;
int emit_bom;
int result;
emit_bom = (__strcasecmp (step->__to_name, "UTF-32//") == 0
|| __strcasecmp (step->__to_name, "UTF-16//") == 0);
if (__strcasecmp (step->__from_name, "UTF-16BE//") == 0
&& (__strcasecmp (step->__to_name, "UTF-32//") == 0
|| __strcasecmp (step->__to_name, "UTF-32BE//") == 0
|| __strcasecmp (step->__to_name, "INTERNAL") == 0))
{
dir = from_utf16;
}
else if ((__strcasecmp (step->__to_name, "UTF-16//") == 0
|| __strcasecmp (step->__to_name, "UTF-16BE//") == 0)
&& (__strcasecmp (step->__from_name, "UTF-32BE//") == 0
|| __strcasecmp (step->__from_name, "INTERNAL") == 0))
{
dir = to_utf16;
}
result = __GCONV_NOCONV;
if (dir != illegal_dir)
{
new_data = (struct utf16_data *) malloc (sizeof (struct utf16_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_utf16)
{
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-16 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 utf-16.c (minus bytes
swapping). */
#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 ("cu24 %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_FROM_LOOP_ERR_HANDLER (3); \
\
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
continue; \
} \
\
uint16_t u1 = get16 (inptr); \
\
if (__builtin_expect (u1 < 0xd800, 1) || u1 > 0xdfff) \
{ \
/* No surrogate. */ \
put32 (outptr, u1); \
inptr += 2; \
} \
else \
{ \
/* An isolated low-surrogate was found. This has to be \
considered ill-formed. */ \
if (__glibc_unlikely (u1 >= 0xdc00)) \
{ \
STANDARD_FROM_LOOP_ERR_HANDLER (2); \
} \
/* It's a surrogate character. At least the first word says \
it is. */ \
if (__glibc_unlikely (inptr + 4 > inend)) \
{ \
/* We don't have enough input for another complete input \
character. */ \
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
\
inptr += 2; \
uint16_t u2 = get16 (inptr); \
if (__builtin_expect (u2 < 0xdc00, 0) \
|| __builtin_expect (u2 > 0xdfff, 0)) \
{ \
/* This is no valid second word for a surrogate. */ \
inptr -= 2; \
STANDARD_FROM_LOOP_ERR_HANDLER (2); \
} \
\
put32 (outptr, ((u1 - 0xd7c0) << 10) + (u2 - 0xdc00)); \
inptr += 2; \
} \
outptr += 4; \
}
#define LOOP_NEED_FLAGS
#include <iconv/loop.c>
/* Conversion from UTF-32 internal/BE to UTF-16. */
#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 copied from utf-16.c (minus bytes
swapping). */
#define BODY \
{ \
if (GLRO (dl_hwcap) & HWCAP_S390_ETF3EH) \
{ \
HARDWARE_CONVERT ("cu42 %0, %1"); \
\
if (inptr != inend) \
{ \
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
continue; \
} \
\
uint32_t c = get32 (inptr); \
\
if (__builtin_expect (c <= 0xd7ff, 1) \
|| (c >=0xdc00 && c <= 0xffff)) \
{ \
/* Two UTF-16 chars. */ \
put16 (outptr, c); \
} \
else if (__builtin_expect (c >= 0x10000, 1) \
&& __builtin_expect (c <= 0x10ffff, 1)) \
{ \
/* Four UTF-16 chars. */ \
uint16_t zabcd = ((c & 0x1f0000) >> 16) - 1; \
uint16_t out; \
\
/* Generate a surrogate character. */ \
if (__glibc_unlikely (outptr + 4 > outend)) \
{ \
/* Overflow in the output buffer. */ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
\
out = 0xd800; \
out |= (zabcd & 0xff) << 6; \
out |= (c >> 10) & 0x3f; \
put16 (outptr, out); \
outptr += 2; \
\
out = 0xdc00; \
out |= c & 0x3ff; \
put16 (outptr, out); \
} \
else \
{ \
STANDARD_TO_LOOP_ERR_HANDLER (4); \
} \
outptr += 2; \
inptr += 4; \
}
#define LOOP_NEED_FLAGS
#include <iconv/loop.c>
#include <iconv/skeleton.c>
|
