| /* Conversion from and to IBM937. |
| Copyright (C) 2000-2016 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Masahide Washizawa <washi@yamato.ibm.co.jp>, 2000. |
| |
| The GNU C Library 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. |
| |
| The GNU C Library 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| /* IBM937 is designed for the representation of Traditional Chinese |
| using a stateful EBCDIC encoding scheme. It is also known as |
| CCSID 937 or CP937. See: |
| https://www-01.ibm.com/software/globalization/ccsid/ccsid937.html */ |
| |
| #include <dlfcn.h> |
| #include <stdint.h> |
| #include <wchar.h> |
| #include <byteswap.h> |
| #include "ibm937.h" |
| |
| /* The shift sequences for this charset (it does not use ESC). */ |
| #define SI 0x0F /* Shift In, host code to turn DBCS off. */ |
| #define SO 0x0E /* Shift Out, host code to turn DBCS on. */ |
| |
| /* Definitions used in the body of the `gconv' function. */ |
| #define CHARSET_NAME "IBM937//" |
| #define FROM_LOOP from_ibm937 |
| #define TO_LOOP to_ibm937 |
| #define ONE_DIRECTION 0 |
| #define FROM_LOOP_MIN_NEEDED_FROM 1 |
| #define FROM_LOOP_MAX_NEEDED_FROM 2 |
| #define FROM_LOOP_MIN_NEEDED_TO 4 |
| #define FROM_LOOP_MAX_NEEDED_TO 4 |
| #define TO_LOOP_MIN_NEEDED_FROM 4 |
| #define TO_LOOP_MAX_NEEDED_FROM 4 |
| #define TO_LOOP_MIN_NEEDED_TO 1 |
| #define TO_LOOP_MAX_NEEDED_TO 3 |
| #define PREPARE_LOOP \ |
| int save_curcs; \ |
| int *curcsp = &data->__statep->__count; |
| #define EXTRA_LOOP_ARGS , curcsp |
| |
| /* Definitions of initialization and destructor function. */ |
| #define DEFINE_INIT 1 |
| #define DEFINE_FINI 1 |
| |
| |
| /* Since this is a stateful encoding we have to provide code which resets |
| the output state to the initial state. This has to be done during the |
| flushing. */ |
| #define EMIT_SHIFT_TO_INIT \ |
| if ((data->__statep->__count & ~7) != sb) \ |
| { \ |
| if (FROM_DIRECTION) \ |
| data->__statep->__count &= 7; \ |
| else \ |
| { \ |
| /* We are not in the initial state. To switch back we have \ |
| to emit `SI'. */ \ |
| if (__glibc_unlikely (outbuf >= outend)) \ |
| /* We don't have enough room in the output buffer. */ \ |
| status = __GCONV_FULL_OUTPUT; \ |
| else \ |
| { \ |
| /* Write out the shift sequence. */ \ |
| *outbuf++ = SI; \ |
| data->__statep->__count &= 7; \ |
| } \ |
| } \ |
| } |
| |
| |
| /* Since we might have to reset input pointer we must be able to save |
| and retore the state. */ |
| #define SAVE_RESET_STATE(Save) \ |
| if (Save) \ |
| save_curcs = *curcsp; \ |
| else \ |
| *curcsp = save_curcs |
| |
| |
| /* Current codeset type. */ |
| enum |
| { |
| sb = 0, |
| db = 64 |
| }; |
| |
| /* First, define the conversion function from IBM-937 to UCS4. */ |
| #define MIN_NEEDED_INPUT FROM_LOOP_MIN_NEEDED_FROM |
| #define MAX_NEEDED_INPUT FROM_LOOP_MAX_NEEDED_FROM |
| #define MIN_NEEDED_OUTPUT FROM_LOOP_MIN_NEEDED_TO |
| #define MAX_NEEDED_OUTPUT FROM_LOOP_MAX_NEEDED_TO |
| #define LOOPFCT FROM_LOOP |
| #define BODY \ |
| { \ |
| uint32_t ch = *inptr; \ |
| uint32_t res; \ |
| \ |
| if (__builtin_expect (ch, 0) == SO) \ |
| { \ |
| /* Shift OUT, change to DBCS converter (redundant escape okay). */ \ |
| curcs = db; \ |
| ++inptr; \ |
| continue; \ |
| } \ |
| else if (__builtin_expect (ch, 0) == SI) \ |
| { \ |
| /* Shift IN, change to SBCS converter (redundant escape okay). */ \ |
| curcs = sb; \ |
| ++inptr; \ |
| continue; \ |
| } \ |
| \ |
| if (curcs == sb) \ |
| { \ |
| /* Use the IBM937 table for single byte. */ \ |
| res = __ibm937sb_to_ucs4[ch]; \ |
| if (__builtin_expect (res, L'\1') == L'\0' && ch != '\0') \ |
| { \ |
| /* This is an illegal character. */ \ |
| STANDARD_FROM_LOOP_ERR_HANDLER (1); \ |
| } \ |
| else \ |
| { \ |
| put32 (outptr, res); \ |
| outptr += 4; \ |
| } \ |
| ++inptr; \ |
| } \ |
| else \ |
| { \ |
| const struct gap *rp2 = __ibm937db_to_ucs4_idx; \ |
| \ |
| assert (curcs == db); \ |
| \ |
| /* Use the IBM937 table for double byte. */ \ |
| if (__glibc_unlikely (inptr + 1 >= inend)) \ |
| { \ |
| /* The second character is not available. \ |
| Store the intermediate result. */ \ |
| result = __GCONV_INCOMPLETE_INPUT; \ |
| break; \ |
| } \ |
| \ |
| ch = (ch * 0x100) + inptr[1]; \ |
| while (ch > rp2->end) \ |
| ++rp2; \ |
| \ |
| if (__builtin_expect (rp2->start == 0xffff, 0) \ |
| || __builtin_expect (ch < rp2->start, 0) \ |
| || (res = __ibm937db_to_ucs4[ch + rp2->idx], \ |
| __builtin_expect (res, L'\1') == L'\0' && ch != '\0')) \ |
| { \ |
| /* This is an illegal character. */ \ |
| STANDARD_FROM_LOOP_ERR_HANDLER (2); \ |
| } \ |
| else \ |
| { \ |
| put32 (outptr, res); \ |
| outptr += 4; \ |
| } \ |
| inptr += 2; \ |
| } \ |
| } |
| #define LOOP_NEED_FLAGS |
| #define EXTRA_LOOP_DECLS , int *curcsp |
| #define INIT_PARAMS int curcs = *curcsp & ~7 |
| #define UPDATE_PARAMS *curcsp = curcs |
| #include <iconv/loop.c> |
| |
| /* Next, define the other direction. */ |
| #define MIN_NEEDED_INPUT TO_LOOP_MIN_NEEDED_FROM |
| #define MAX_NEEDED_INPUT TO_LOOP_MAX_NEEDED_FROM |
| #define MIN_NEEDED_OUTPUT TO_LOOP_MIN_NEEDED_TO |
| #define MAX_NEEDED_OUTPUT TO_LOOP_MAX_NEEDED_TO |
| #define LOOPFCT TO_LOOP |
| #define BODY \ |
| { \ |
| uint32_t ch = get32 (inptr); \ |
| const struct gap *rp1 = __ucs4_to_ibm937sb_idx; \ |
| const struct gap *rp2 = __ucs4_to_ibm937db_idx; \ |
| const char *cp; \ |
| \ |
| if (__glibc_unlikely (ch >= 0xffff)) \ |
| { \ |
| UNICODE_TAG_HANDLER (ch, 4); \ |
| \ |
| STANDARD_TO_LOOP_ERR_HANDLER (4); \ |
| } \ |
| \ |
| while (ch > rp1->end) \ |
| ++rp1; \ |
| \ |
| /* Use the UCS4 table for single byte. */ \ |
| if (__builtin_expect (ch < rp1->start, 0) \ |
| || (cp = __ucs4_to_ibm937sb[ch + rp1->idx], \ |
| __builtin_expect (cp[0], L'\1') == L'\0' && ch != '\0')) \ |
| { \ |
| /* Use the UCS4 table for double byte. */ \ |
| while (ch > rp2->end) \ |
| ++rp2; \ |
| \ |
| if (__builtin_expect (ch < rp2->start, 0) \ |
| || (cp = __ucs4_to_ibm937db[ch + rp2->idx], \ |
| __builtin_expect (cp[0], L'\1')==L'\0' && ch != '\0')) \ |
| { \ |
| /* This is an illegal character. */ \ |
| STANDARD_TO_LOOP_ERR_HANDLER (4); \ |
| } \ |
| else \ |
| { \ |
| if (curcs == sb) \ |
| { \ |
| if (__glibc_unlikely (outptr + 1 > outend)) \ |
| { \ |
| result = __GCONV_FULL_OUTPUT; \ |
| break; \ |
| } \ |
| *outptr++ = SO; \ |
| curcs = db; \ |
| } \ |
| \ |
| if (__glibc_unlikely (outptr + 2 > outend)) \ |
| { \ |
| result = __GCONV_FULL_OUTPUT; \ |
| break; \ |
| } \ |
| *outptr++ = cp[0]; \ |
| *outptr++ = cp[1]; \ |
| } \ |
| } \ |
| else \ |
| { \ |
| if (curcs == db) \ |
| { \ |
| if (__glibc_unlikely (outptr + 1 > outend)) \ |
| { \ |
| result = __GCONV_FULL_OUTPUT; \ |
| break; \ |
| } \ |
| *outptr++ = SI; \ |
| curcs = sb; \ |
| } \ |
| \ |
| if (__glibc_unlikely (outptr + 1 > outend)) \ |
| { \ |
| result = __GCONV_FULL_OUTPUT; \ |
| break; \ |
| } \ |
| *outptr++ = cp[0]; \ |
| } \ |
| \ |
| /* Now that we wrote the output increment the input pointer. */ \ |
| inptr += 4; \ |
| } |
| #define LOOP_NEED_FLAGS |
| #define EXTRA_LOOP_DECLS , int *curcsp |
| #define INIT_PARAMS int curcs = *curcsp & ~7 |
| #define REINIT_PARAMS curcs = *curcsp & ~7 |
| #define UPDATE_PARAMS *curcsp = curcs |
| #include <iconv/loop.c> |
| |
| /* Now define the toplevel functions. */ |
| #include <iconv/skeleton.c> |