/* Mapping tables for EUC-CN handling. Copyright (C) 1998 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper , 1998. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include #include #include #include #include #include /* Direction of the transformation. */ enum direction { illegal, to_euccn, from_euccn }; struct euccn_data { enum direction dir; }; int gconv_init (struct gconv_step *step) { /* Determine which direction. */ struct euccn_data *new_data; enum direction dir; int result; if (strcasestr (step->from_name, "EUC-CN") != NULL) dir = from_euccn; else if (strcasestr (step->to_name, "EUC-CN") != NULL) dir = to_euccn; else dir = illegal; result = GCONV_NOCONV; if (dir != illegal && ((new_data = (struct euccn_data *) malloc (sizeof (struct euccn_data))) != NULL)) { new_data->dir = dir; step->data = new_data; result = GCONV_OK; } return result; } void gconv_end (struct gconv_step *data) { free (data->data); } int gconv (struct gconv_step *step, struct gconv_step_data *data, const char *inbuf, size_t *inbufsize, size_t *written, int do_flush) { struct gconv_step *next_step = step + 1; struct gconv_step_data *next_data = data + 1; gconv_fct fct = next_step->fct; size_t do_write; int result; /* If the function is called with no input this means we have to reset to the initial state. The possibly partly converted input is dropped. */ if (do_flush) { do_write = 0; /* Call the steps down the chain if there are any. */ if (data->is_last) result = GCONV_OK; else { struct gconv_step *next_step = step + 1; struct gconv_step_data *next_data = data + 1; result = (*fct) (next_step, next_data, NULL, 0, written, 1); /* Clear output buffer. */ data->outbufavail = 0; } } else { enum direction dir = ((struct euccn_data *) step->data)->dir; do_write = 0; do { result = GCONV_OK; if (dir == from_euccn) { size_t inchars = *inbufsize; size_t outwchars = data->outbufavail; char *outbuf = data->outbuf; size_t cnt = 0; while (cnt < inchars && (outwchars + sizeof (wchar_t) <= data->outbufsize)) { int inchar = (unsigned char) inbuf[cnt]; wchar_t ch; if (inchar <= 0x7f) ch = (wchar_t) inchar; else if ((inchar <= 0xa0 || inchar > 0xfe) && inchar != 0x8e && inchar != 0x8f) /* This is illegal. */ ch = L'\0'; else { /* Two or more byte character. First test whether the next character is also available. */ const char *endp; int inchar2; if (cnt + 1 >= inchars) { /* The second character is not available. Store the intermediate result. */ result = GCONV_INCOMPLETE_INPUT; break; } inchar2 = (unsigned char) inbuf[++cnt]; /* All second bytes of a multibyte character must be >= 0xa1. */ if (inchar2 < 0xa1) { /* This is an illegal character. */ --cnt; result = GCONV_ILLEGAL_INPUT; break; } /* This is code set 1: GB 2312-80. */ endp = &inbuf[cnt - 1]; ch = gb2312_to_ucs4 (&endp, 2, 0x80); if (ch != L'\0') ++cnt; if (ch == UNKNOWN_10646_CHAR) ch = L'\0'; if (ch == L'\0') --cnt; } if (ch == L'\0' && inbuf[cnt] != '\0') { /* This is an illegal character. */ result = GCONV_ILLEGAL_INPUT; break; } *((wchar_t *) (outbuf + outwchars)) = ch; ++do_write; outwchars += sizeof (wchar_t); ++cnt; } *inbufsize -= cnt; data->outbufavail = outwchars; } else { size_t inwchars = *inbufsize; size_t outchars = data->outbufavail; char *outbuf = data->outbuf; size_t cnt = 0; int extra = 0; while (inwchars >= cnt + sizeof (wchar_t) && outchars < data->outbufsize) { wchar_t ch = *((wchar_t *) (inbuf + cnt)); if (ch <= L'\x7f') /* It's plain ASCII. */ outbuf[outchars] = ch; else { /* Try the JIS character sets. */ size_t found; found = ucs4_to_gb2312 (ch, &outbuf[outchars], (data->outbufsize - outchars)); if (found > 0) { /* It's a GB 2312 character, adjust it for EUC-CN. */ outbuf[outchars++] += 0x80; outbuf[outchars] += 0x80; } else if (found == 0) { /* We ran out of space. */ extra = 2; break; } else /* Illegal character. */ break; } ++do_write; ++outchars; cnt += sizeof (wchar_t); } *inbufsize -= cnt; data->outbufavail = outchars; if (outchars + extra < data->outbufsize) { /* If there is still room in the output buffer something is wrong with the input. */ if (inwchars >= cnt + sizeof (wchar_t)) { /* An error occurred. */ result = GCONV_ILLEGAL_INPUT; break; } if (inwchars != cnt) { /* There are some unprocessed bytes at the end of the input buffer. */ result = GCONV_INCOMPLETE_INPUT; break; } } } if (result != GCONV_OK) break; if (data->is_last) { /* This is the last step. */ result = (*inbufsize > (dir == from_euccn ? 0 : sizeof (wchar_t) - 1) ? GCONV_FULL_OUTPUT : GCONV_EMPTY_INPUT); break; } /* Status so far. */ result = GCONV_EMPTY_INPUT; if (data->outbufavail > 0) { /* Call the functions below in the chain. */ size_t newavail = data->outbufavail; result = (*fct) (next_step, next_data, data->outbuf, &newavail, written, 0); /* Correct the output buffer. */ if (newavail != data->outbufavail && newavail > 0) { memmove (data->outbuf, &data->outbuf[data->outbufavail - newavail], newavail); data->outbufavail = newavail; } } } while (*inbufsize > 0 && result == GCONV_EMPTY_INPUT); } if (written != NULL && data->is_last) *written = do_write; return result; }