| /* Conversion between UTF-8 and UTF-32 BE/internal. |
| |
| This module uses the Z9-109 variants of the Convert Unicode |
| instructions. |
| Copyright (C) 1997-2009 Free Software Foundation, Inc. |
| |
| Author: Andreas Krebbel <Andreas.Krebbel@de.ibm.com> |
| Based on the work by Ulrich Drepper <drepper@cygnus.com>, 1997. |
| |
| Thanks to Daniel Appich who covered the relevant performance work |
| in his diploma thesis. |
| |
| This is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| This is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <dlfcn.h> |
| #include <stdint.h> |
| #include <unistd.h> |
| #include <dl-procinfo.h> |
| #include <gconv.h> |
| |
| /* UTF-32 big endian byte order mark. */ |
| #define BOM 0x0000feffu |
| |
| #define DEFINE_INIT 0 |
| #define DEFINE_FINI 0 |
| /* These definitions apply to the UTF-8 to UTF-32 direction. The |
| software implementation for UTF-8 still supports multibyte |
| characters up to 6 bytes whereas the hardware variant does not. */ |
| #define MIN_NEEDED_FROM 1 |
| #define MAX_NEEDED_FROM 6 |
| #define MIN_NEEDED_TO 4 |
| #define FROM_LOOP from_utf8_loop |
| #define TO_LOOP to_utf8_loop |
| #define FROM_DIRECTION (dir == from_utf8) |
| #define PREPARE_LOOP \ |
| enum direction dir = ((struct utf8_data *) step->__data)->dir; \ |
| int emit_bom = ((struct utf8_data *) step->__data)->emit_bom; \ |
| \ |
| if (emit_bom && !data->__internal_use \ |
| && data->__invocation_counter == 0) \ |
| { \ |
| /* Emit the Byte Order Mark. */ \ |
| if (__builtin_expect (outbuf + 4 > outend, 0)) \ |
| return __GCONV_FULL_OUTPUT; \ |
| \ |
| put32u (outbuf, BOM); \ |
| outbuf += 4; \ |
| } |
| |
| /* Direction of the transformation. */ |
| enum direction |
| { |
| illegal_dir, |
| to_utf8, |
| from_utf8 |
| }; |
| |
| struct utf8_data |
| { |
| enum direction dir; |
| int emit_bom; |
| }; |
| |
| |
| extern int gconv_init (struct __gconv_step *step); |
| int |
| gconv_init (struct __gconv_step *step) |
| { |
| /* Determine which direction. */ |
| struct utf8_data *new_data; |
| enum direction dir = illegal_dir; |
| int emit_bom; |
| int result; |
| |
| emit_bom = (__strcasecmp (step->__to_name, "UTF-32//") == 0); |
| |
| if (__strcasecmp (step->__from_name, "ISO-10646/UTF8/") == 0 |
| && (__strcasecmp (step->__to_name, "UTF-32//") == 0 |
| || __strcasecmp (step->__to_name, "UTF-32BE//") == 0 |
| || __strcasecmp (step->__to_name, "INTERNAL") == 0)) |
| { |
| dir = from_utf8; |
| } |
| else if (__strcasecmp (step->__to_name, "ISO-10646/UTF8/") == 0 |
| && (__strcasecmp (step->__from_name, "UTF-32BE//") == 0 |
| || __strcasecmp (step->__from_name, "INTERNAL") == 0)) |
| { |
| dir = to_utf8; |
| } |
| |
| result = __GCONV_NOCONV; |
| if (dir != illegal_dir) |
| { |
| new_data = (struct utf8_data *) malloc (sizeof (struct utf8_data)); |
| |
| result = __GCONV_NOMEM; |
| if (new_data != NULL) |
| { |
| new_data->dir = dir; |
| new_data->emit_bom = emit_bom; |
| step->__data = new_data; |
| |
| if (dir == from_utf8) |
| { |
| step->__min_needed_from = MIN_NEEDED_FROM; |
| step->__max_needed_from = MIN_NEEDED_FROM; |
| step->__min_needed_to = MIN_NEEDED_TO; |
| step->__max_needed_to = MIN_NEEDED_TO; |
| } |
| else |
| { |
| step->__min_needed_from = MIN_NEEDED_TO; |
| step->__max_needed_from = MIN_NEEDED_TO; |
| step->__min_needed_to = MIN_NEEDED_FROM; |
| step->__max_needed_to = MIN_NEEDED_FROM; |
| } |
| |
| step->__stateful = 0; |
| |
| result = __GCONV_OK; |
| } |
| } |
| |
| return result; |
| } |
| |
| |
| extern void gconv_end (struct __gconv_step *data); |
| void |
| gconv_end (struct __gconv_step *data) |
| { |
| free (data->__data); |
| } |
| |
| /* The macro for the hardware loop. This is used for both |
| directions. */ |
| #define HARDWARE_CONVERT(INSTRUCTION) \ |
| { \ |
| register const unsigned char* pInput asm ("8") = inptr; \ |
| register unsigned long long inlen asm ("9") = inend - inptr; \ |
| register unsigned char* pOutput asm ("10") = outptr; \ |
| register unsigned long long outlen asm("11") = outend - outptr; \ |
| uint64_t cc = 0; \ |
| \ |
| asm volatile ("0: " INSTRUCTION " \n\t" \ |
| " jo 0b \n\t" \ |
| " ipm %2 \n" \ |
| : "+a" (pOutput), "+a" (pInput), "+d" (cc), \ |
| "+d" (outlen), "+d" (inlen) \ |
| : \ |
| : "cc", "memory"); \ |
| \ |
| inptr = pInput; \ |
| outptr = pOutput; \ |
| cc >>= 28; \ |
| \ |
| if (cc == 1) \ |
| { \ |
| result = __GCONV_FULL_OUTPUT; \ |
| break; \ |
| } \ |
| else if (cc == 2) \ |
| { \ |
| result = __GCONV_ILLEGAL_INPUT; \ |
| break; \ |
| } \ |
| } |
| |
| /* Conversion function from UTF-8 to UTF-32 internal/BE. */ |
| |
| #define MIN_NEEDED_INPUT MIN_NEEDED_FROM |
| #define MAX_NEEDED_INPUT MAX_NEEDED_FROM |
| #define MIN_NEEDED_OUTPUT MIN_NEEDED_TO |
| #define LOOPFCT FROM_LOOP |
| /* The software routine is copied from gconv_simple.c. */ |
| #define BODY \ |
| { \ |
| if (GLRO (dl_hwcap) & HWCAP_S390_ETF3EH) \ |
| { \ |
| HARDWARE_CONVERT ("cu14 %0, %1, 1"); \ |
| \ |
| if (inptr != inend) \ |
| { \ |
| int i; \ |
| for (i = 1; inptr + i < inend; ++i) \ |
| if ((inptr[i] & 0xc0) != 0x80) \ |
| break; \ |
| \ |
| if (__builtin_expect (inptr + i == inend, 1)) \ |
| { \ |
| result = __GCONV_INCOMPLETE_INPUT; \ |
| break; \ |
| } \ |
| STANDARD_FROM_LOOP_ERR_HANDLER (i); \ |
| } \ |
| continue; \ |
| } \ |
| \ |
| /* Next input byte. */ \ |
| uint32_t ch = *inptr; \ |
| \ |
| if (__builtin_expect (ch < 0x80, 1)) \ |
| { \ |
| /* One byte sequence. */ \ |
| ++inptr; \ |
| } \ |
| else \ |
| { \ |
| uint_fast32_t cnt; \ |
| uint_fast32_t i; \ |
| \ |
| if (ch >= 0xc2 && ch < 0xe0) \ |
| { \ |
| /* We expect two bytes. The first byte cannot be 0xc0 or \ |
| 0xc1, otherwise the wide character could have been \ |
| represented using a single byte. */ \ |
| cnt = 2; \ |
| ch &= 0x1f; \ |
| } \ |
| else if (__builtin_expect ((ch & 0xf0) == 0xe0, 1)) \ |
| { \ |
| /* We expect three bytes. */ \ |
| cnt = 3; \ |
| ch &= 0x0f; \ |
| } \ |
| else if (__builtin_expect ((ch & 0xf8) == 0xf0, 1)) \ |
| { \ |
| /* We expect four bytes. */ \ |
| cnt = 4; \ |
| ch &= 0x07; \ |
| } \ |
| else if (__builtin_expect ((ch & 0xfc) == 0xf8, 1)) \ |
| { \ |
| /* We expect five bytes. */ \ |
| cnt = 5; \ |
| ch &= 0x03; \ |
| } \ |
| else if (__builtin_expect ((ch & 0xfe) == 0xfc, 1)) \ |
| { \ |
| /* We expect six bytes. */ \ |
| cnt = 6; \ |
| ch &= 0x01; \ |
| } \ |
| else \ |
| { \ |
| /* Search the end of this ill-formed UTF-8 character. This \ |
| is the next byte with (x & 0xc0) != 0x80. */ \ |
| i = 0; \ |
| do \ |
| ++i; \ |
| while (inptr + i < inend \ |
| && (*(inptr + i) & 0xc0) == 0x80 \ |
| && i < 5); \ |
| \ |
| errout: \ |
| STANDARD_FROM_LOOP_ERR_HANDLER (i); \ |
| } \ |
| \ |
| if (__builtin_expect (inptr + cnt > inend, 0)) \ |
| { \ |
| /* We don't have enough input. But before we report \ |
| that check that all the bytes are correct. */ \ |
| for (i = 1; inptr + i < inend; ++i) \ |
| if ((inptr[i] & 0xc0) != 0x80) \ |
| break; \ |
| \ |
| if (__builtin_expect (inptr + i == inend, 1)) \ |
| { \ |
| result = __GCONV_INCOMPLETE_INPUT; \ |
| break; \ |
| } \ |
| \ |
| goto errout; \ |
| } \ |
| \ |
| /* Read the possible remaining bytes. */ \ |
| for (i = 1; i < cnt; ++i) \ |
| { \ |
| uint32_t byte = inptr[i]; \ |
| \ |
| if ((byte & 0xc0) != 0x80) \ |
| /* This is an illegal encoding. */ \ |
| break; \ |
| \ |
| ch <<= 6; \ |
| ch |= byte & 0x3f; \ |
| } \ |
| \ |
| /* If i < cnt, some trail byte was not >= 0x80, < 0xc0. \ |
| If cnt > 2 and ch < 2^(5*cnt-4), the wide character ch could \ |
| have been represented with fewer than cnt bytes. */ \ |
| if (i < cnt || (cnt > 2 && (ch >> (5 * cnt - 4)) == 0)) \ |
| { \ |
| /* This is an illegal encoding. */ \ |
| goto errout; \ |
| } \ |
| \ |
| inptr += cnt; \ |
| } \ |
| \ |
| /* Now adjust the pointers and store the result. */ \ |
| *((uint32_t *) outptr) = ch; \ |
| outptr += sizeof (uint32_t); \ |
| } |
| #define LOOP_NEED_FLAGS |
| |
| #define STORE_REST \ |
| { \ |
| /* We store the remaining bytes while converting them into the UCS4 \ |
| format. We can assume that the first byte in the buffer is \ |
| correct and that it requires a larger number of bytes than there \ |
| are in the input buffer. */ \ |
| wint_t ch = **inptrp; \ |
| size_t cnt, r; \ |
| \ |
| state->__count = inend - *inptrp; \ |
| \ |
| if (ch >= 0xc2 && ch < 0xe0) \ |
| { \ |
| /* We expect two bytes. The first byte cannot be 0xc0 or \ |
| 0xc1, otherwise the wide character could have been \ |
| represented using a single byte. */ \ |
| cnt = 2; \ |
| ch &= 0x1f; \ |
| } \ |
| else if (__builtin_expect ((ch & 0xf0) == 0xe0, 1)) \ |
| { \ |
| /* We expect three bytes. */ \ |
| cnt = 3; \ |
| ch &= 0x0f; \ |
| } \ |
| else if (__builtin_expect ((ch & 0xf8) == 0xf0, 1)) \ |
| { \ |
| /* We expect four bytes. */ \ |
| cnt = 4; \ |
| ch &= 0x07; \ |
| } \ |
| else if (__builtin_expect ((ch & 0xfc) == 0xf8, 1)) \ |
| { \ |
| /* We expect five bytes. */ \ |
| cnt = 5; \ |
| ch &= 0x03; \ |
| } \ |
| else \ |
| { \ |
| /* We expect six bytes. */ \ |
| cnt = 6; \ |
| ch &= 0x01; \ |
| } \ |
| \ |
| /* The first byte is already consumed. */ \ |
| r = cnt - 1; \ |
| while (++(*inptrp) < inend) \ |
| { \ |
| ch <<= 6; \ |
| ch |= **inptrp & 0x3f; \ |
| --r; \ |
| } \ |
| \ |
| /* Shift for the so far missing bytes. */ \ |
| ch <<= r * 6; \ |
| \ |
| /* Store the number of bytes expected for the entire sequence. */ \ |
| state->__count |= cnt << 8; \ |
| \ |
| /* Store the value. */ \ |
| state->__value.__wch = ch; \ |
| } |
| |
| #define UNPACK_BYTES \ |
| { \ |
| static const unsigned char inmask[5] = { 0xc0, 0xe0, 0xf0, 0xf8, 0xfc }; \ |
| wint_t wch = state->__value.__wch; \ |
| size_t ntotal = state->__count >> 8; \ |
| \ |
| inlen = state->__count & 255; \ |
| \ |
| bytebuf[0] = inmask[ntotal - 2]; \ |
| \ |
| do \ |
| { \ |
| if (--ntotal < inlen) \ |
| bytebuf[ntotal] = 0x80 | (wch & 0x3f); \ |
| wch >>= 6; \ |
| } \ |
| while (ntotal > 1); \ |
| \ |
| bytebuf[0] |= wch; \ |
| } |
| |
| #define CLEAR_STATE \ |
| state->__count = 0 |
| |
| #include <iconv/loop.c> |
| |
| /* Conversion from UTF-32 internal/BE to UTF-8. */ |
| |
| #define MIN_NEEDED_INPUT MIN_NEEDED_TO |
| #define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM |
| #define MAX_NEEDED_OUTPUT MAX_NEEDED_FROM |
| #define LOOPFCT TO_LOOP |
| /* The software routine mimics the S/390 cu41 instruction. */ |
| #define BODY \ |
| { \ |
| if (GLRO (dl_hwcap) & HWCAP_S390_ETF3EH) \ |
| { \ |
| HARDWARE_CONVERT ("cu41 %0, %1"); \ |
| \ |
| if (inptr != inend) \ |
| { \ |
| result = __GCONV_INCOMPLETE_INPUT; \ |
| break; \ |
| } \ |
| continue; \ |
| } \ |
| \ |
| uint32_t wc = *((const uint32_t *) inptr); \ |
| \ |
| if (__builtin_expect (wc <= 0x7f, 1)) \ |
| { \ |
| /* Single UTF-8 char. */ \ |
| *outptr = (uint8_t)wc; \ |
| outptr++; \ |
| } \ |
| else if (wc <= 0x7ff) \ |
| { \ |
| /* Two UTF-8 chars. */ \ |
| if (__builtin_expect (outptr + 2 > outend, 0)) \ |
| { \ |
| /* Overflow in the output buffer. */ \ |
| result = __GCONV_FULL_OUTPUT; \ |
| break; \ |
| } \ |
| \ |
| outptr[0] = 0xc0; \ |
| outptr[0] |= wc >> 6; \ |
| \ |
| outptr[1] = 0x80; \ |
| outptr[1] |= wc & 0x3f; \ |
| \ |
| outptr += 2; \ |
| } \ |
| else if (wc <= 0xffff) \ |
| { \ |
| /* Three UTF-8 chars. */ \ |
| if (__builtin_expect (outptr + 3 > outend, 0)) \ |
| { \ |
| /* Overflow in the output buffer. */ \ |
| result = __GCONV_FULL_OUTPUT; \ |
| break; \ |
| } \ |
| outptr[0] = 0xe0; \ |
| outptr[0] |= wc >> 12; \ |
| \ |
| outptr[1] = 0x80; \ |
| outptr[1] |= (wc >> 6) & 0x3f; \ |
| \ |
| outptr[2] = 0x80; \ |
| outptr[2] |= wc & 0x3f; \ |
| \ |
| outptr += 3; \ |
| } \ |
| else if (wc <= 0x10ffff) \ |
| { \ |
| /* Four UTF-8 chars. */ \ |
| if (__builtin_expect (outptr + 4 > outend, 0)) \ |
| { \ |
| /* Overflow in the output buffer. */ \ |
| result = __GCONV_FULL_OUTPUT; \ |
| break; \ |
| } \ |
| outptr[0] = 0xf0; \ |
| outptr[0] |= wc >> 18; \ |
| \ |
| outptr[1] = 0x80; \ |
| outptr[1] |= (wc >> 12) & 0x3f; \ |
| \ |
| outptr[2] = 0x80; \ |
| outptr[2] |= (wc >> 6) & 0x3f; \ |
| \ |
| outptr[3] = 0x80; \ |
| outptr[3] |= wc & 0x3f; \ |
| \ |
| outptr += 4; \ |
| } \ |
| else \ |
| { \ |
| STANDARD_TO_LOOP_ERR_HANDLER (4); \ |
| } \ |
| inptr += 4; \ |
| } |
| #define LOOP_NEED_FLAGS |
| #include <iconv/loop.c> |
| |
| #include <iconv/skeleton.c> |
