| /* 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-32 big endian byte order mark. */ |
| #define BOM_UTF32 0x0000feffu |
| |
| /* UTF-16 big endian byte order mark. */ |
| #define BOM_UTF16 0xfeff |
| |
| #define DEFINE_INIT 0 |
| #define DEFINE_FINI 0 |
| #define MIN_NEEDED_FROM 2 |
| #define MAX_NEEDED_FROM 4 |
| #define MIN_NEEDED_TO 4 |
| #define FROM_LOOP from_utf16_loop |
| #define TO_LOOP to_utf16_loop |
| #define FROM_DIRECTION (dir == from_utf16) |
| #define PREPARE_LOOP \ |
| enum direction dir = ((struct utf16_data *) step->__data)->dir; \ |
| int emit_bom = ((struct utf16_data *) step->__data)->emit_bom; \ |
| \ |
| if (emit_bom && !data->__internal_use \ |
| && data->__invocation_counter == 0) \ |
| { \ |
| if (dir == to_utf16) \ |
| { \ |
| /* Emit the UTF-16 Byte Order Mark. */ \ |
| if (__builtin_expect (outbuf + 2 > outend, 0)) \ |
| return __GCONV_FULL_OUTPUT; \ |
| \ |
| put16u (outbuf, BOM_UTF16); \ |
| outbuf += 2; \ |
| } \ |
| else \ |
| { \ |
| /* Emit the UTF-32 Byte Order Mark. */ \ |
| if (__builtin_expect (outbuf + 4 > outend, 0)) \ |
| return __GCONV_FULL_OUTPUT; \ |
| \ |
| put32u (outbuf, BOM_UTF32); \ |
| outbuf += 4; \ |
| } \ |
| } |
| |
| /* Direction of the transformation. */ |
| enum direction |
| { |
| illegal_dir, |
| to_utf16, |
| from_utf16 |
| }; |
| |
| struct utf16_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 utf16_data *new_data; |
| enum direction dir = illegal_dir; |
| int emit_bom; |
| int result; |
| |
| emit_bom = (__strcasecmp (step->__to_name, "UTF-32//") == 0 |
| || __strcasecmp (step->__to_name, "UTF-16//") == 0); |
| |
| if (__strcasecmp (step->__from_name, "UTF-16BE//") == 0 |
| && (__strcasecmp (step->__to_name, "UTF-32//") == 0 |
| || __strcasecmp (step->__to_name, "UTF-32BE//") == 0 |
| || __strcasecmp (step->__to_name, "INTERNAL") == 0)) |
| { |
| dir = from_utf16; |
| } |
| else if ((__strcasecmp (step->__to_name, "UTF-16//") == 0 |
| || __strcasecmp (step->__to_name, "UTF-16BE//") == 0) |
| && (__strcasecmp (step->__from_name, "UTF-32BE//") == 0 |
| || __strcasecmp (step->__from_name, "INTERNAL") == 0)) |
| { |
| dir = to_utf16; |
| } |
| |
| result = __GCONV_NOCONV; |
| if (dir != illegal_dir) |
| { |
| new_data = (struct utf16_data *) malloc (sizeof (struct utf16_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_utf16) |
| { |
| 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-16 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 utf-16.c (minus bytes |
| swapping). */ |
| #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 ("cu24 %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_FROM_LOOP_ERR_HANDLER (3); \ |
| \ |
| result = __GCONV_INCOMPLETE_INPUT; \ |
| break; \ |
| } \ |
| continue; \ |
| } \ |
| \ |
| uint16_t u1 = get16 (inptr); \ |
| \ |
| if (__builtin_expect (u1 < 0xd800, 1) || u1 > 0xdfff) \ |
| { \ |
| /* No surrogate. */ \ |
| put32 (outptr, u1); \ |
| inptr += 2; \ |
| } \ |
| else \ |
| { \ |
| /* An isolated low-surrogate was found. This has to be \ |
| considered ill-formed. */ \ |
| if (__builtin_expect (u1 >= 0xdc00, 0)) \ |
| { \ |
| STANDARD_FROM_LOOP_ERR_HANDLER (2); \ |
| } \ |
| /* It's a surrogate character. At least the first word says \ |
| it is. */ \ |
| if (__builtin_expect (inptr + 4 > inend, 0)) \ |
| { \ |
| /* We don't have enough input for another complete input \ |
| character. */ \ |
| result = __GCONV_INCOMPLETE_INPUT; \ |
| break; \ |
| } \ |
| \ |
| inptr += 2; \ |
| uint16_t u2 = get16 (inptr); \ |
| if (__builtin_expect (u2 < 0xdc00, 0) \ |
| || __builtin_expect (u2 > 0xdfff, 0)) \ |
| { \ |
| /* This is no valid second word for a surrogate. */ \ |
| inptr -= 2; \ |
| STANDARD_FROM_LOOP_ERR_HANDLER (2); \ |
| } \ |
| \ |
| put32 (outptr, ((u1 - 0xd7c0) << 10) + (u2 - 0xdc00)); \ |
| inptr += 2; \ |
| } \ |
| outptr += 4; \ |
| } |
| #define LOOP_NEED_FLAGS |
| #include <iconv/loop.c> |
| |
| /* Conversion from UTF-32 internal/BE to UTF-16. */ |
| |
| #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 copied from utf-16.c (minus bytes |
| swapping). */ |
| #define BODY \ |
| { \ |
| if (GLRO (dl_hwcap) & HWCAP_S390_ETF3EH) \ |
| { \ |
| HARDWARE_CONVERT ("cu42 %0, %1"); \ |
| \ |
| if (inptr != inend) \ |
| { \ |
| result = __GCONV_INCOMPLETE_INPUT; \ |
| break; \ |
| } \ |
| continue; \ |
| } \ |
| \ |
| uint32_t c = get32 (inptr); \ |
| \ |
| if (__builtin_expect (c <= 0xd7ff, 1) \ |
| || (c >=0xdc00 && c <= 0xffff)) \ |
| { \ |
| /* Two UTF-16 chars. */ \ |
| put16 (outptr, c); \ |
| } \ |
| else if (__builtin_expect (c >= 0x10000, 1) \ |
| && __builtin_expect (c <= 0x10ffff, 1)) \ |
| { \ |
| /* Four UTF-16 chars. */ \ |
| uint16_t zabcd = ((c & 0x1f0000) >> 16) - 1; \ |
| uint16_t out; \ |
| \ |
| /* Generate a surrogate character. */ \ |
| if (__builtin_expect (outptr + 4 > outend, 0)) \ |
| { \ |
| /* Overflow in the output buffer. */ \ |
| result = __GCONV_FULL_OUTPUT; \ |
| break; \ |
| } \ |
| \ |
| out = 0xd800; \ |
| out |= (zabcd & 0xff) << 6; \ |
| out |= (c >> 10) & 0x3f; \ |
| put16 (outptr, out); \ |
| outptr += 2; \ |
| \ |
| out = 0xdc00; \ |
| out |= c & 0x3ff; \ |
| put16 (outptr, out); \ |
| } \ |
| else \ |
| { \ |
| STANDARD_TO_LOOP_ERR_HANDLER (4); \ |
| } \ |
| outptr += 2; \ |
| inptr += 4; \ |
| } |
| #define LOOP_NEED_FLAGS |
| #include <iconv/loop.c> |
| |
| #include <iconv/skeleton.c> |
