| /* Conversion between UTF-16 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-16 big endian byte order mark. */ |
| #define BOM_UTF16 0xfeff |
| |
| #define DEFINE_INIT 0 |
| #define DEFINE_FINI 0 |
| #define MIN_NEEDED_FROM 1 |
| #define MAX_NEEDED_FROM 4 |
| #define MIN_NEEDED_TO 2 |
| #define MAX_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 UTF-16 Byte Order Mark. */ \ |
| if (__builtin_expect (outbuf + 2 > outend, 0)) \ |
| return __GCONV_FULL_OUTPUT; \ |
| \ |
| put16u (outbuf, BOM_UTF16); \ |
| outbuf += 2; \ |
| } |
| |
| /* 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-16//") == 0); |
| |
| if (__strcasecmp (step->__from_name, "ISO-10646/UTF8/") == 0 |
| && (__strcasecmp (step->__to_name, "UTF-16//") == 0 |
| || __strcasecmp (step->__to_name, "UTF-16BE//") == 0)) |
| { |
| dir = from_utf8; |
| } |
| else if (__strcasecmp (step->__from_name, "UTF-16BE//") == 0 |
| && __strcasecmp (step->__to_name, "ISO-10646/UTF8/") == 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-16. */ |
| |
| #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 implementation is based on the code in gconv_simple.c. */ |
| #define BODY \ |
| { \ |
| if (GLRO (dl_hwcap) & HWCAP_S390_ETF3EH) \ |
| { \ |
| HARDWARE_CONVERT ("cu12 %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. */ \ |
| uint16_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 \ |
| { \ |
| /* 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; \ |
| } \ |
| \ |
| if (cnt == 4) \ |
| { \ |
| /* For 4 byte UTF-8 chars two UTF-16 chars (high and \ |
| low) are needed. */ \ |
| uint16_t zabcd, high, low; \ |
| \ |
| if (__builtin_expect (outptr + 4 > outend, 0)) \ |
| { \ |
| /* Overflow in the output buffer. */ \ |
| result = __GCONV_FULL_OUTPUT; \ |
| break; \ |
| } \ |
| \ |
| /* See Principles of Operations cu12. */ \ |
| zabcd = (((inptr[0] & 0x7) << 2) | \ |
| ((inptr[1] & 0x30) >> 4)) - 1; \ |
| \ |
| /* z-bit must be zero after subtracting 1. */ \ |
| if (zabcd & 0x10) \ |
| STANDARD_FROM_LOOP_ERR_HANDLER (4) \ |
| \ |
| high = (uint16_t)(0xd8 << 8); /* high surrogate id */ \ |
| high |= zabcd << 6; /* abcd bits */ \ |
| high |= (inptr[1] & 0xf) << 2; /* efgh bits */ \ |
| high |= (inptr[2] & 0x30) >> 4; /* ij bits */ \ |
| \ |
| low = (uint16_t)(0xdc << 8); /* low surrogate id */ \ |
| low |= ((uint16_t)inptr[2] & 0xc) << 6; /* kl bits */ \ |
| low |= (inptr[2] & 0x3) << 6; /* mn bits */ \ |
| low |= inptr[3] & 0x3f; /* opqrst bits */ \ |
| \ |
| put16 (outptr, high); \ |
| outptr += 2; \ |
| put16 (outptr, low); \ |
| outptr += 2; \ |
| inptr += 4; \ |
| continue; \ |
| } \ |
| else \ |
| { \ |
| /* Read the possible remaining bytes. */ \ |
| for (i = 1; i < cnt; ++i) \ |
| { \ |
| uint16_t byte = inptr[i]; \ |
| \ |
| if ((byte & 0xc0) != 0x80) \ |
| /* This is an illegal encoding. */ \ |
| break; \ |
| \ |
| ch <<= 6; \ |
| ch |= byte & 0x3f; \ |
| } \ |
| inptr += cnt; \ |
| \ |
| } \ |
| } \ |
| /* Now adjust the pointers and store the result. */ \ |
| *((uint16_t *) outptr) = ch; \ |
| outptr += sizeof (uint16_t); \ |
| } |
| |
| #define LOOP_NEED_FLAGS |
| #include <iconv/loop.c> |
| |
| /* Conversion from UTF-16 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 is based on the functionality of the S/390 |
| hardware instruction (cu21) as described in the Principles of |
| Operation. */ |
| #define BODY \ |
| { \ |
| /* The hardware instruction currently fails to report an error for \ |
| isolated low surrogates so we have to disable the instruction \ |
| until this gets resolved. */ \ |
| if (0) /* (GLRO (dl_hwcap) & HWCAP_S390_ETF3EH) */ \ |
| { \ |
| HARDWARE_CONVERT ("cu21 %0, %1, 1"); \ |
| if (inptr != inend) \ |
| { \ |
| /* Check if the third byte is \ |
| a valid start of a UTF-16 surrogate. */ \ |
| if (inend - inptr == 3 && (inptr[3] & 0xfc) != 0xdc) \ |
| STANDARD_TO_LOOP_ERR_HANDLER (3); \ |
| \ |
| result = __GCONV_INCOMPLETE_INPUT; \ |
| break; \ |
| } \ |
| continue; \ |
| } \ |
| \ |
| uint16_t c = get16 (inptr); \ |
| \ |
| if (__builtin_expect (c <= 0x007f, 1)) \ |
| { \ |
| /* Single byte UTF-8 char. */ \ |
| *outptr = c & 0xff; \ |
| outptr++; \ |
| } \ |
| else if (c >= 0x0080 && c <= 0x07ff) \ |
| { \ |
| /* Two byte UTF-8 char. */ \ |
| \ |
| if (__builtin_expect (outptr + 2 > outend, 0)) \ |
| { \ |
| /* Overflow in the output buffer. */ \ |
| result = __GCONV_FULL_OUTPUT; \ |
| break; \ |
| } \ |
| \ |
| outptr[0] = 0xc0; \ |
| outptr[0] |= c >> 6; \ |
| \ |
| outptr[1] = 0x80; \ |
| outptr[1] |= c & 0x3f; \ |
| \ |
| outptr += 2; \ |
| } \ |
| else if ((c >= 0x0800 && c <= 0xd7ff) || c > 0xdfff) \ |
| { \ |
| /* Three byte UTF-8 char. */ \ |
| \ |
| if (__builtin_expect (outptr + 3 > outend, 0)) \ |
| { \ |
| /* Overflow in the output buffer. */ \ |
| result = __GCONV_FULL_OUTPUT; \ |
| break; \ |
| } \ |
| outptr[0] = 0xe0; \ |
| outptr[0] |= c >> 12; \ |
| \ |
| outptr[1] = 0x80; \ |
| outptr[1] |= (c >> 6) & 0x3f; \ |
| \ |
| outptr[2] = 0x80; \ |
| outptr[2] |= c & 0x3f; \ |
| \ |
| outptr += 3; \ |
| } \ |
| else if (c >= 0xd800 && c <= 0xdbff) \ |
| { \ |
| /* Four byte UTF-8 char. */ \ |
| uint16_t low, uvwxy; \ |
| \ |
| if (__builtin_expect (outptr + 4 > outend, 0)) \ |
| { \ |
| /* Overflow in the output buffer. */ \ |
| result = __GCONV_FULL_OUTPUT; \ |
| break; \ |
| } \ |
| inptr += 2; \ |
| if (__builtin_expect (inptr + 2 > inend, 0)) \ |
| { \ |
| result = __GCONV_INCOMPLETE_INPUT; \ |
| break; \ |
| } \ |
| \ |
| low = get16 (inptr); \ |
| \ |
| if ((low & 0xfc00) != 0xdc00) \ |
| { \ |
| inptr -= 2; \ |
| STANDARD_TO_LOOP_ERR_HANDLER (2); \ |
| } \ |
| uvwxy = ((c >> 6) & 0xf) + 1; \ |
| outptr[0] = 0xf0; \ |
| outptr[0] |= uvwxy >> 2; \ |
| \ |
| outptr[1] = 0x80; \ |
| outptr[1] |= (uvwxy << 4) & 0x30; \ |
| outptr[1] |= (c >> 2) & 0x0f; \ |
| \ |
| outptr[2] = 0x80; \ |
| outptr[2] |= (c & 0x03) << 4; \ |
| outptr[2] |= (low >> 6) & 0x0f; \ |
| \ |
| outptr[3] = 0x80; \ |
| outptr[3] |= low & 0x3f; \ |
| \ |
| outptr += 4; \ |
| } \ |
| else \ |
| { \ |
| STANDARD_TO_LOOP_ERR_HANDLER (2); \ |
| } \ |
| inptr += 2; \ |
| } |
| #define LOOP_NEED_FLAGS |
| #include <iconv/loop.c> |
| |
| #include <iconv/skeleton.c> |
