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511 lines
14 KiB
C
511 lines
14 KiB
C
/* Conversion between UTF-8 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) 1997-2013 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 0x0000feffu
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#define DEFINE_INIT 0
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#define DEFINE_FINI 0
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/* These definitions apply to the UTF-8 to UTF-32 direction. The
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software implementation for UTF-8 still supports multibyte
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characters up to 6 bytes whereas the hardware variant does not. */
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#define MIN_NEEDED_FROM 1
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#define MAX_NEEDED_FROM 6
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#define MIN_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 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 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); \
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outbuf += 4; \
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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-32//") == 0);
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if (__strcasecmp (step->__from_name, "ISO-10646/UTF8/") == 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_utf8;
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}
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else if (__strcasecmp (step->__to_name, "ISO-10646/UTF8/") == 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_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-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 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 ("cu14 %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 (__builtin_expect (inptr + i == inend, 1)) \
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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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uint32_t ch = *inptr; \
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\
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if (__builtin_expect (ch < 0x80, 1)) \
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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 or \
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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 (__builtin_expect ((ch & 0xf0) == 0xe0, 1)) \
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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 (__builtin_expect ((ch & 0xf8) == 0xf0, 1)) \
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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 if (__builtin_expect ((ch & 0xfc) == 0xf8, 1)) \
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{ \
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/* We expect five bytes. */ \
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cnt = 5; \
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ch &= 0x03; \
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} \
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else if (__builtin_expect ((ch & 0xfe) == 0xfc, 1)) \
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{ \
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/* We expect six bytes. */ \
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cnt = 6; \
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ch &= 0x01; \
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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 (__builtin_expect (inptr + cnt > inend, 0)) \
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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 (__builtin_expect (inptr + i == inend, 1)) \
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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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/* Read the possible remaining bytes. */ \
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for (i = 1; i < cnt; ++i) \
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{ \
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uint32_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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\
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/* If i < cnt, some trail byte was not >= 0x80, < 0xc0. \
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If cnt > 2 and ch < 2^(5*cnt-4), the wide character ch could \
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have been represented with fewer than cnt bytes. */ \
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if (i < cnt || (cnt > 2 && (ch >> (5 * cnt - 4)) == 0)) \
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{ \
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/* This is an illegal encoding. */ \
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goto errout; \
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} \
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\
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inptr += cnt; \
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} \
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\
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/* Now adjust the pointers and store the result. */ \
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*((uint32_t *) outptr) = ch; \
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outptr += sizeof (uint32_t); \
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}
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#define LOOP_NEED_FLAGS
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#define STORE_REST \
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{ \
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/* We store the remaining bytes while converting them into the UCS4 \
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format. We can assume that the first byte in the buffer is \
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correct and that it requires a larger number of bytes than there \
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are in the input buffer. */ \
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wint_t ch = **inptrp; \
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size_t cnt, r; \
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\
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state->__count = inend - *inptrp; \
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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 or \
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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 (__builtin_expect ((ch & 0xf0) == 0xe0, 1)) \
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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 (__builtin_expect ((ch & 0xf8) == 0xf0, 1)) \
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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 if (__builtin_expect ((ch & 0xfc) == 0xf8, 1)) \
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{ \
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/* We expect five bytes. */ \
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cnt = 5; \
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ch &= 0x03; \
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} \
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else \
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{ \
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/* We expect six bytes. */ \
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cnt = 6; \
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ch &= 0x01; \
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} \
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\
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/* The first byte is already consumed. */ \
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r = cnt - 1; \
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while (++(*inptrp) < inend) \
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{ \
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ch <<= 6; \
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ch |= **inptrp & 0x3f; \
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--r; \
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} \
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\
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/* Shift for the so far missing bytes. */ \
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ch <<= r * 6; \
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\
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/* Store the number of bytes expected for the entire sequence. */ \
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state->__count |= cnt << 8; \
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\
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/* Store the value. */ \
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state->__value.__wch = ch; \
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}
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#define UNPACK_BYTES \
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{ \
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static const unsigned char inmask[5] = { 0xc0, 0xe0, 0xf0, 0xf8, 0xfc }; \
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wint_t wch = state->__value.__wch; \
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size_t ntotal = state->__count >> 8; \
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\
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inlen = state->__count & 255; \
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\
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bytebuf[0] = inmask[ntotal - 2]; \
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\
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do \
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{ \
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if (--ntotal < inlen) \
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bytebuf[ntotal] = 0x80 | (wch & 0x3f); \
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wch >>= 6; \
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} \
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while (ntotal > 1); \
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\
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bytebuf[0] |= wch; \
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}
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#define CLEAR_STATE \
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state->__count = 0
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#include <iconv/loop.c>
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/* Conversion from UTF-32 internal/BE 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 mimics the S/390 cu41 instruction. */
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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 ("cu41 %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 wc = *((const uint32_t *) inptr); \
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\
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if (__builtin_expect (wc <= 0x7f, 1)) \
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{ \
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/* Single UTF-8 char. */ \
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*outptr = (uint8_t)wc; \
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outptr++; \
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} \
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else if (wc <= 0x7ff) \
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{ \
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/* Two UTF-8 chars. */ \
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if (__builtin_expect (outptr + 2 > 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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outptr[0] = 0xc0; \
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outptr[0] |= wc >> 6; \
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\
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outptr[1] = 0x80; \
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outptr[1] |= wc & 0x3f; \
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\
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outptr += 2; \
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} \
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else if (wc <= 0xffff) \
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{ \
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/* Three UTF-8 chars. */ \
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if (__builtin_expect (outptr + 3 > 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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outptr[0] = 0xe0; \
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outptr[0] |= wc >> 12; \
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\
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outptr[1] = 0x80; \
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outptr[1] |= (wc >> 6) & 0x3f; \
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\
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outptr[2] = 0x80; \
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outptr[2] |= wc & 0x3f; \
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\
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outptr += 3; \
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} \
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else if (wc <= 0x10ffff) \
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{ \
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/* Four UTF-8 chars. */ \
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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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outptr[0] = 0xf0; \
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outptr[0] |= wc >> 18; \
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\
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outptr[1] = 0x80; \
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outptr[1] |= (wc >> 12) & 0x3f; \
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\
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outptr[2] = 0x80; \
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outptr[2] |= (wc >> 6) & 0x3f; \
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\
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outptr[3] = 0x80; \
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outptr[3] |= wc & 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 (4); \
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} \
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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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