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337 lines
9.5 KiB
C
337 lines
9.5 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) 1997-2009 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-32 big endian byte order mark. */
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#define BOM_UTF32 0x0000feffu
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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 2
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#define MAX_NEEDED_FROM 4
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#define MIN_NEEDED_TO 4
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#define FROM_LOOP from_utf16_loop
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#define TO_LOOP to_utf16_loop
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#define FROM_DIRECTION (dir == from_utf16)
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#define PREPARE_LOOP \
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enum direction dir = ((struct utf16_data *) step->__data)->dir; \
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int emit_bom = ((struct utf16_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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if (dir == to_utf16) \
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{ \
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/* Emit the UTF-16 Byte Order Mark. */ \
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if (__builtin_expect (outbuf + 2 > outend, 0)) \
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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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else \
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{ \
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/* Emit the UTF-32 Byte Order Mark. */ \
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if (__builtin_expect (outbuf + 4 > outend, 0)) \
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return __GCONV_FULL_OUTPUT; \
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\
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put32u (outbuf, BOM_UTF32); \
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outbuf += 4; \
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} \
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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_utf16,
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from_utf16
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};
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struct utf16_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 utf16_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-32//") == 0
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|| __strcasecmp (step->__to_name, "UTF-16//") == 0);
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if (__strcasecmp (step->__from_name, "UTF-16BE//") == 0
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&& (__strcasecmp (step->__to_name, "UTF-32//") == 0
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|| __strcasecmp (step->__to_name, "UTF-32BE//") == 0
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|| __strcasecmp (step->__to_name, "INTERNAL") == 0))
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{
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dir = from_utf16;
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}
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else if ((__strcasecmp (step->__to_name, "UTF-16//") == 0
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|| __strcasecmp (step->__to_name, "UTF-16BE//") == 0)
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&& (__strcasecmp (step->__from_name, "UTF-32BE//") == 0
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|| __strcasecmp (step->__from_name, "INTERNAL") == 0))
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{
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dir = to_utf16;
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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 utf16_data *) malloc (sizeof (struct utf16_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_utf16)
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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-16 to UTF-32 internal/BE. */
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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 routine is copied from utf-16.c (minus bytes
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swapping). */
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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 ("cu24 %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_FROM_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 u1 = get16 (inptr); \
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\
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if (__builtin_expect (u1 < 0xd800, 1) || u1 > 0xdfff) \
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{ \
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/* No surrogate. */ \
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put32 (outptr, u1); \
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inptr += 2; \
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} \
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else \
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{ \
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/* An isolated low-surrogate was found. This has to be \
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considered ill-formed. */ \
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if (__builtin_expect (u1 >= 0xdc00, 0)) \
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{ \
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STANDARD_FROM_LOOP_ERR_HANDLER (2); \
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} \
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/* It's a surrogate character. At least the first word says \
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it is. */ \
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if (__builtin_expect (inptr + 4 > inend, 0)) \
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{ \
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/* We don't have enough input for another complete input \
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character. */ \
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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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inptr += 2; \
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uint16_t u2 = get16 (inptr); \
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if (__builtin_expect (u2 < 0xdc00, 0) \
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|| __builtin_expect (u2 > 0xdfff, 0)) \
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{ \
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/* This is no valid second word for a surrogate. */ \
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inptr -= 2; \
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STANDARD_FROM_LOOP_ERR_HANDLER (2); \
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} \
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\
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put32 (outptr, ((u1 - 0xd7c0) << 10) + (u2 - 0xdc00)); \
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inptr += 2; \
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} \
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outptr += 4; \
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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-32 internal/BE to UTF-16. */
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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 copied from utf-16.c (minus bytes
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swapping). */
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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 ("cu42 %0, %1"); \
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\
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if (inptr != 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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continue; \
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} \
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\
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uint32_t c = get32 (inptr); \
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\
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if (__builtin_expect (c <= 0xd7ff, 1) \
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|| (c >=0xdc00 && c <= 0xffff)) \
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{ \
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/* Two UTF-16 chars. */ \
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put16 (outptr, c); \
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} \
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else if (__builtin_expect (c >= 0x10000, 1) \
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&& __builtin_expect (c <= 0x10ffff, 1)) \
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{ \
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/* Four UTF-16 chars. */ \
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uint16_t zabcd = ((c & 0x1f0000) >> 16) - 1; \
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uint16_t out; \
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\
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/* Generate a surrogate character. */ \
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if (__builtin_expect (outptr + 4 > outend, 0)) \
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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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out = 0xd800; \
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out |= (zabcd & 0xff) << 6; \
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out |= (c >> 10) & 0x3f; \
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put16 (outptr, out); \
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outptr += 2; \
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\
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out = 0xdc00; \
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out |= c & 0x3ff; \
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put16 (outptr, out); \
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} \
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else \
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{ \
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STANDARD_TO_LOOP_ERR_HANDLER (4); \
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} \
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outptr += 2; \
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inptr += 4; \
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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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