EUC-JP encding.
authordrepper <drepper>
Mon, 13 Apr 1998 09:39:21 +0000 (09:39 +0000)
committerdrepper <drepper>
Mon, 13 Apr 1998 09:39:21 +0000 (09:39 +0000)
iconvdata/eucjp.c [new file with mode: 0644]

diff --git a/iconvdata/eucjp.c b/iconvdata/eucjp.c
new file mode 100644 (file)
index 0000000..708640d
--- /dev/null
@@ -0,0 +1,348 @@
+/* Mapping tables for EUC-JP handling.
+   Copyright (C) 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 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 <gconv.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <wchar.h>
+#include <jis0201.h>
+#include <jis0208.h>
+#include <jis0212.h>
+
+/* Direction of the transformation.  */
+enum direction
+{
+  illegal,
+  to_eucjp,
+  from_eucjp
+};
+
+struct eucjp_data
+{
+  enum direction dir;
+};
+
+
+int
+gconv_init (struct gconv_step *step)
+{
+  /* Determine which direction.  */
+  struct eucjp_data *new_data;
+  enum direction dir;
+  int result;
+
+  if (strcasestr (step->from_name, "EUC-JP") != NULL)
+    dir = from_eucjp;
+  else if (strcasestr (step->to_name, "EUC-JP") != NULL)
+    dir = to_eucjp;
+  else
+    dir = illegal;
+
+  result = GCONV_NOCONV;
+  if (dir != illegal
+      && ((new_data
+          = (struct eucjp_data *) malloc (sizeof (struct eucjp_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 eucjp_data *) step->data)->dir;
+
+      do_write = 0;
+
+      do
+       {
+         result = GCONV_OK;
+
+         if (dir == from_eucjp)
+           {
+             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.  */
+                     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;
+                       }
+
+                     if (inchar == '\x8e')
+                       /* This is code set 2: half-width katakana.  */
+                       ch = jisx0201_to_ucs4 (inchar2);
+                     else if (inchar == '\x8f')
+                       {
+                         /* This is code set 3: JIS X 0212-1990.  */
+                         const char *endp = &inbuf[cnt];
+
+                         ch = jisx0212_to_ucs4 (&endp, 1 + inchars - cnt,
+                                                0x80);
+                         cnt = endp - inbuf;
+                       }
+                     else
+                       {
+                         /* This is code set 1: JIS X 0208.  */
+                         const char *endp = &inbuf[cnt - 1];
+
+                         ch = jisx0208_to_ucs4 (&endp, 2 + inchars - cnt,
+                                                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_jisx0201 (ch, &outbuf[outchars], 1);
+
+                     if (found == 0)
+                       {
+                         /* No JIS 0201 character.  */
+                         found = ucs4_to_jisx0208 (ch, &outbuf[outchars],
+                                                   (data->outbufsize
+                                                    - outchars));
+                         if (found > 0)
+                           {
+                             /* It's a JIS 0208 character, adjust it for
+                                EUC-JP.  */
+                             outbuf[outchars++] += 0x80;
+                             outbuf[outchars] += 0x80;
+                           }
+                         else if (found == 0)
+                           {
+                             /* We ran out of space.  */
+                             extra = 2;
+                             break;
+                           }
+                         else
+                           {
+                             /* No JIS 0208 character.  */
+                             found = ucs4_to_jisx0212 (ch, &outbuf[outchars],
+                                                       (data->outbufsize
+                                                        - outchars));
+
+                             if (found > 0)
+                               {
+                                 /* It's a JIS 0212 character, adjust it for
+                                    EUC-JP.  */
+                                 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_eucjp
+                                     ? 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;
+}