/* Conversion to and from IBM937. Copyright (C) 2000, 2001 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #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 MIN_NEEDED_FROM 1 #define MAX_NEEDED_FROM 2 #define MIN_NEEDED_TO 4 #define MAX_NEEDED_TO 4 #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 (__builtin_expect (outbuf >= outend, 0)) \ /* 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 MIN_NEEDED_FROM #define MAX_NEEDED_INPUT MAX_NEEDED_FROM #define MIN_NEEDED_OUTPUT MIN_NEEDED_TO #define LOOPFCT FROM_LOOP #define BODY \ { \ uint32_t ch = *inptr; \ \ if (__builtin_expect (ch, 0) == SO) \ { \ /* Shift OUT, change to DBCS converter. */ \ if (curcs == db) \ { \ result = __GCONV_ILLEGAL_INPUT; \ break; \ } \ curcs = db; \ ++inptr; \ continue; \ } \ else if (__builtin_expect (ch, 0) == SI) \ { \ /* Shift IN, change to SBCS converter. */ \ if (curcs == sb) \ { \ result = __GCONV_ILLEGAL_INPUT; \ break; \ } \ curcs = sb; \ ++inptr; \ continue; \ } \ \ if (curcs == sb) \ { \ /* Use the UCS4 table for single byte. */ \ ch = __ibm937sb_to_ucs4[ch]; \ if (__builtin_expect (ch, L'\1') == L'\0' && *inptr != '\0') \ { \ /* This is an illegal character. */ \ if (! ignore_errors_p ()) \ { \ result = __GCONV_ILLEGAL_INPUT; \ break; \ } \ ++*irreversible; \ } \ else \ { \ put32 (outptr, ch); \ outptr += 4; \ } \ ++inptr; \ } \ else \ { \ /* Use the IBM937 table for double byte. */ \ \ assert (curcs == db); \ \ ch = ibm937db_to_ucs4(inptr[0], inptr[1]); \ if (__builtin_expect (ch, L'\1') == L'\0' && *inptr != '\0') \ { \ /* This is an illegal character. */ \ if (! ignore_errors_p ()) \ { \ result = __GCONV_ILLEGAL_INPUT; \ break; \ } \ ++*irreversible; \ } \ else \ { \ put32 (outptr, ch); \ 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 MIN_NEEDED_TO #define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM #define MAX_NEEDED_OUTPUT MAX_NEEDED_FROM #define LOOPFCT TO_LOOP #define BODY \ { \ uint32_t ch = get32 (inptr); \ const char *cp; \ \ /* Use the UCS4 table for single byte. */ \ cp = __ucs4_to_ibm937sb[ch]; \ if (__builtin_expect (ch >= (sizeof (__ucs4_to_ibm937sb) \ / sizeof (__ucs4_to_ibm937sb[0])), 0) \ || (__builtin_expect (cp[0], '\1') == '\0' && ch != 0)) \ { \ /* Use the UCS4 table for double byte. */ \ cp = __ucs4_to_ibm937db[ch]; \ if (__builtin_expect (ch >= (sizeof (__ucs4_to_ibm937db) \ / sizeof (__ucs4_to_ibm937db[0])), 0) \ || __builtin_expect (cp[0], '\1') == '\0') \ { \ UNICODE_TAG_HANDLER (ch, 4); \ \ /* This is an illegal character. */ \ if (! ignore_errors_p ()) \ { \ result = __GCONV_ILLEGAL_INPUT; \ break; \ } \ ++*irreversible; \ } \ else \ { \ if (curcs == sb) \ { \ *outptr++ = SO; \ curcs = db; \ } \ if (__builtin_expect (outptr + 1 >= outend, 0)) \ { \ result = __GCONV_FULL_OUTPUT; \ break; \ } \ *outptr++ = cp[0]; \ *outptr++ = cp[1]; \ } \ } \ else \ { \ if (curcs == db) \ { \ *outptr++ = SI; \ curcs = sb; \ if (__builtin_expect (outptr == outend, 0)) \ { \ 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 UPDATE_PARAMS *curcsp = curcs #include <iconv/loop.c> /* Now define the toplevel functions. */ #include <iconv/skeleton.c>