470 lines
13 KiB
C
470 lines
13 KiB
C
/* Conversion between UTF-16 and UTF-32 BE/internal.
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This module uses the Z9-109 variants of the Convert Unicode
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instructions.
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Copyright (C) 1997-2014 Free Software Foundation, Inc.
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Author: Andreas Krebbel <Andreas.Krebbel@de.ibm.com>
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Based on the work by Ulrich Drepper <drepper@cygnus.com>, 1997.
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Thanks to Daniel Appich who covered the relevant performance work
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in his diploma thesis.
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This is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <dlfcn.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <dl-procinfo.h>
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#include <gconv.h>
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/* UTF-16 big endian byte order mark. */
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#define BOM_UTF16 0xfeff
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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 4
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#define MIN_NEEDED_TO 2
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#define MAX_NEEDED_TO 4
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#define FROM_LOOP from_utf8_loop
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#define TO_LOOP to_utf8_loop
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#define FROM_DIRECTION (dir == from_utf8)
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#define ONE_DIRECTION 0
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#define PREPARE_LOOP \
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enum direction dir = ((struct utf8_data *) step->__data)->dir; \
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int emit_bom = ((struct utf8_data *) step->__data)->emit_bom; \
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\
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if (emit_bom && !data->__internal_use \
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&& data->__invocation_counter == 0) \
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{ \
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/* Emit the UTF-16 Byte Order Mark. */ \
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if (__glibc_unlikely (outbuf + 2 > outend)) \
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return __GCONV_FULL_OUTPUT; \
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\
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put16u (outbuf, BOM_UTF16); \
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outbuf += 2; \
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}
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/* Direction of the transformation. */
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enum direction
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{
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illegal_dir,
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to_utf8,
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from_utf8
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};
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struct utf8_data
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{
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enum direction dir;
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int emit_bom;
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};
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extern int gconv_init (struct __gconv_step *step);
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int
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gconv_init (struct __gconv_step *step)
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{
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/* Determine which direction. */
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struct utf8_data *new_data;
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enum direction dir = illegal_dir;
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int emit_bom;
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int result;
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emit_bom = (__strcasecmp (step->__to_name, "UTF-16//") == 0);
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if (__strcasecmp (step->__from_name, "ISO-10646/UTF8/") == 0
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&& (__strcasecmp (step->__to_name, "UTF-16//") == 0
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|| __strcasecmp (step->__to_name, "UTF-16BE//") == 0))
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{
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dir = from_utf8;
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}
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else if (__strcasecmp (step->__from_name, "UTF-16BE//") == 0
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&& __strcasecmp (step->__to_name, "ISO-10646/UTF8/") == 0)
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{
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dir = to_utf8;
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}
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result = __GCONV_NOCONV;
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if (dir != illegal_dir)
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{
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new_data = (struct utf8_data *) malloc (sizeof (struct utf8_data));
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result = __GCONV_NOMEM;
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if (new_data != NULL)
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{
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new_data->dir = dir;
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new_data->emit_bom = emit_bom;
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step->__data = new_data;
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if (dir == from_utf8)
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{
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step->__min_needed_from = MIN_NEEDED_FROM;
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step->__max_needed_from = MIN_NEEDED_FROM;
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step->__min_needed_to = MIN_NEEDED_TO;
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step->__max_needed_to = MIN_NEEDED_TO;
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}
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else
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{
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step->__min_needed_from = MIN_NEEDED_TO;
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step->__max_needed_from = MIN_NEEDED_TO;
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step->__min_needed_to = MIN_NEEDED_FROM;
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step->__max_needed_to = MIN_NEEDED_FROM;
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}
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step->__stateful = 0;
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result = __GCONV_OK;
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}
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}
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return result;
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}
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extern void gconv_end (struct __gconv_step *data);
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void
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gconv_end (struct __gconv_step *data)
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{
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free (data->__data);
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}
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/* The macro for the hardware loop. This is used for both
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directions. */
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#define HARDWARE_CONVERT(INSTRUCTION) \
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{ \
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register const unsigned char* pInput asm ("8") = inptr; \
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register unsigned long long inlen asm ("9") = inend - inptr; \
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register unsigned char* pOutput asm ("10") = outptr; \
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register unsigned long long outlen asm("11") = outend - outptr; \
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uint64_t cc = 0; \
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\
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asm volatile (".machine push \n\t" \
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".machine \"z9-109\" \n\t" \
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"0: " INSTRUCTION " \n\t" \
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".machine pop \n\t" \
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" jo 0b \n\t" \
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" ipm %2 \n" \
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: "+a" (pOutput), "+a" (pInput), "+d" (cc), \
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"+d" (outlen), "+d" (inlen) \
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: \
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: "cc", "memory"); \
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\
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inptr = pInput; \
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outptr = pOutput; \
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cc >>= 28; \
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\
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if (cc == 1) \
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{ \
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result = __GCONV_FULL_OUTPUT; \
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break; \
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} \
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else if (cc == 2) \
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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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}
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/* Conversion function from UTF-8 to UTF-16. */
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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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/* The software implementation is based on the code in gconv_simple.c. */
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#define BODY \
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{ \
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if (GLRO (dl_hwcap) & HWCAP_S390_ETF3EH) \
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{ \
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HARDWARE_CONVERT ("cu12 %0, %1, 1"); \
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\
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if (inptr != inend) \
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{ \
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int i; \
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for (i = 1; inptr + i < inend; ++i) \
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if ((inptr[i] & 0xc0) != 0x80) \
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break; \
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\
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if (__glibc_likely (inptr + i == inend)) \
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{ \
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result = __GCONV_INCOMPLETE_INPUT; \
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break; \
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} \
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STANDARD_FROM_LOOP_ERR_HANDLER (i); \
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} \
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continue; \
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} \
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\
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/* Next input byte. */ \
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uint16_t ch = *inptr; \
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\
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if (__glibc_likely (ch < 0x80)) \
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{ \
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/* One byte sequence. */ \
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++inptr; \
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} \
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else \
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{ \
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uint_fast32_t cnt; \
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uint_fast32_t i; \
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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 \
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or 0xc1, otherwise the wide character could have been \
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represented 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 (__glibc_likely ((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 (__glibc_likely ((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 \
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{ \
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/* Search the end of this ill-formed UTF-8 character. This \
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is the next byte with (x & 0xc0) != 0x80. */ \
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i = 0; \
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do \
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++i; \
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while (inptr + i < inend \
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&& (*(inptr + i) & 0xc0) == 0x80 \
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&& i < 5); \
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\
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errout: \
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STANDARD_FROM_LOOP_ERR_HANDLER (i); \
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} \
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\
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if (__glibc_unlikely (inptr + cnt > inend)) \
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{ \
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/* We don't have enough input. But before we report \
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that check that all the bytes are correct. */ \
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for (i = 1; inptr + i < inend; ++i) \
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if ((inptr[i] & 0xc0) != 0x80) \
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break; \
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\
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if (__glibc_likely (inptr + i == inend)) \
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{ \
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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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goto errout; \
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} \
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\
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if (cnt == 4) \
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{ \
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/* For 4 byte UTF-8 chars two UTF-16 chars (high and \
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low) are needed. */ \
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uint16_t zabcd, high, low; \
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\
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if (__glibc_unlikely (outptr + 4 > outend)) \
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{ \
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/* Overflow in the output buffer. */ \
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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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/* See Principles of Operations cu12. */ \
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zabcd = (((inptr[0] & 0x7) << 2) | \
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((inptr[1] & 0x30) >> 4)) - 1; \
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\
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/* z-bit must be zero after subtracting 1. */ \
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if (zabcd & 0x10) \
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STANDARD_FROM_LOOP_ERR_HANDLER (4) \
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\
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high = (uint16_t)(0xd8 << 8); /* high surrogate id */ \
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high |= zabcd << 6; /* abcd bits */ \
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high |= (inptr[1] & 0xf) << 2; /* efgh bits */ \
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high |= (inptr[2] & 0x30) >> 4; /* ij bits */ \
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\
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low = (uint16_t)(0xdc << 8); /* low surrogate id */ \
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low |= ((uint16_t)inptr[2] & 0xc) << 6; /* kl bits */ \
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low |= (inptr[2] & 0x3) << 6; /* mn bits */ \
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low |= inptr[3] & 0x3f; /* opqrst bits */ \
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\
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put16 (outptr, high); \
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outptr += 2; \
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put16 (outptr, low); \
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outptr += 2; \
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inptr += 4; \
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continue; \
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} \
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else \
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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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uint16_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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inptr += cnt; \
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\
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} \
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} \
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/* Now adjust the pointers and store the result. */ \
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*((uint16_t *) outptr) = ch; \
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outptr += sizeof (uint16_t); \
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}
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#define LOOP_NEED_FLAGS
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#include <iconv/loop.c>
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/* Conversion from UTF-16 to UTF-8. */
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#define MIN_NEEDED_INPUT MIN_NEEDED_TO
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#define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM
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#define MAX_NEEDED_OUTPUT MAX_NEEDED_FROM
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#define LOOPFCT TO_LOOP
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/* The software routine is based on the functionality of the S/390
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hardware instruction (cu21) as described in the Principles of
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Operation. */
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#define BODY \
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{ \
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/* The hardware instruction currently fails to report an error for \
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isolated low surrogates so we have to disable the instruction \
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until this gets resolved. */ \
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if (0) /* (GLRO (dl_hwcap) & HWCAP_S390_ETF3EH) */ \
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{ \
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HARDWARE_CONVERT ("cu21 %0, %1, 1"); \
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if (inptr != inend) \
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{ \
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/* Check if the third byte is \
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a valid start of a UTF-16 surrogate. */ \
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if (inend - inptr == 3 && (inptr[3] & 0xfc) != 0xdc) \
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STANDARD_TO_LOOP_ERR_HANDLER (3); \
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\
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result = __GCONV_INCOMPLETE_INPUT; \
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break; \
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} \
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continue; \
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} \
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\
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uint16_t c = get16 (inptr); \
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\
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if (__glibc_likely (c <= 0x007f)) \
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{ \
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/* Single byte UTF-8 char. */ \
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*outptr = c & 0xff; \
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outptr++; \
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} \
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else if (c >= 0x0080 && c <= 0x07ff) \
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{ \
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/* Two byte UTF-8 char. */ \
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\
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if (__glibc_unlikely (outptr + 2 > outend)) \
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{ \
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/* Overflow in the output buffer. */ \
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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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outptr[0] = 0xc0; \
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outptr[0] |= c >> 6; \
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\
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outptr[1] = 0x80; \
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outptr[1] |= c & 0x3f; \
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\
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outptr += 2; \
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} \
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else if ((c >= 0x0800 && c <= 0xd7ff) || c > 0xdfff) \
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{ \
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/* Three byte UTF-8 char. */ \
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\
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if (__glibc_unlikely (outptr + 3 > outend)) \
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{ \
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/* Overflow in the output buffer. */ \
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result = __GCONV_FULL_OUTPUT; \
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break; \
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} \
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outptr[0] = 0xe0; \
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outptr[0] |= c >> 12; \
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\
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outptr[1] = 0x80; \
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outptr[1] |= (c >> 6) & 0x3f; \
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\
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outptr[2] = 0x80; \
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outptr[2] |= c & 0x3f; \
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\
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outptr += 3; \
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} \
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else if (c >= 0xd800 && c <= 0xdbff) \
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{ \
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/* Four byte UTF-8 char. */ \
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uint16_t low, uvwxy; \
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\
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if (__glibc_unlikely (outptr + 4 > outend)) \
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{ \
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/* Overflow in the output buffer. */ \
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result = __GCONV_FULL_OUTPUT; \
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break; \
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} \
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inptr += 2; \
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if (__glibc_unlikely (inptr + 2 > inend)) \
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{ \
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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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low = get16 (inptr); \
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\
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if ((low & 0xfc00) != 0xdc00) \
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{ \
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inptr -= 2; \
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STANDARD_TO_LOOP_ERR_HANDLER (2); \
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} \
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uvwxy = ((c >> 6) & 0xf) + 1; \
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outptr[0] = 0xf0; \
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outptr[0] |= uvwxy >> 2; \
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\
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outptr[1] = 0x80; \
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outptr[1] |= (uvwxy << 4) & 0x30; \
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outptr[1] |= (c >> 2) & 0x0f; \
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\
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outptr[2] = 0x80; \
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outptr[2] |= (c & 0x03) << 4; \
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outptr[2] |= (low >> 6) & 0x0f; \
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\
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outptr[3] = 0x80; \
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outptr[3] |= low & 0x3f; \
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\
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outptr += 4; \
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} \
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else \
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{ \
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STANDARD_TO_LOOP_ERR_HANDLER (2); \
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} \
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inptr += 2; \
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}
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#define LOOP_NEED_FLAGS
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#include <iconv/loop.c>
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#include <iconv/skeleton.c>
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