Generic implementation for 8bit charsets.
authordrepper <drepper>
Mon, 1 Dec 1997 16:50:01 +0000 (16:50 +0000)
committerdrepper <drepper>
Mon, 1 Dec 1997 16:50:01 +0000 (16:50 +0000)
iconvdata/8bit-generic.c [new file with mode: 0644]

diff --git a/iconvdata/8bit-generic.c b/iconvdata/8bit-generic.c
new file mode 100644 (file)
index 0000000..fe0a09b
--- /dev/null
@@ -0,0 +1,228 @@
+/* Generic conversion to and from 8bit charsets.
+   Copyright (C) 1997 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+   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 <stdlib.h>
+#include <string.h>
+
+/* Direction of the transformation.  */
+enum direction
+{
+  illegal,
+  to_8bit,
+  from_8bit
+};
+
+struct s_8bit_data
+{
+  enum direction dir;
+};
+
+
+int
+gconv_init (struct gconv_step *step, struct gconv_step_data *data)
+{
+  /* Determine which direction.  */
+  struct s_8bit_data *new_data;
+  enum direction dir;
+  int result;
+
+  if (__strcasestr (step->from_name, NAME) != NULL)
+    dir = from_8bit;
+  else if (__strcasestr (step->to_name, NAME) != NULL)
+    dir = to_8bit;
+  else
+    dir = illegal;
+
+  result = GCONV_NOCONV;
+  if (dir != illegal
+      && ((new_data
+          = (struct s_8bit_data *) malloc (sizeof (struct s_8bit_data)))
+         != NULL))
+    {
+      new_data->dir = dir;
+      data->data = new_data;
+      result = GCONV_OK;
+    }
+
+  return result;
+}
+
+
+void
+gconv_end (struct gconv_step_data *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 s_8bit_data *) data->data)->dir;
+
+      do_write = 0;
+
+      do
+       {
+         result = GCONV_OK;
+
+         if (dir == from_8bit)
+           {
+             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))
+               {
+                 wchar_t ch = to_ucs4[(unsigned int) inbuf[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;
+
+             while (inwchars >= cnt + sizeof (wchar_t)
+                    && outchars < data->outbufsize)
+               {
+                 int ch = *((wchar_t *) (inbuf + cnt));
+
+                 if (ch >= sizeof (from_ucs4) / sizeof (from_ucs4[0])
+                     || ch < 0 || (from_ucs4[ch] == '\0' && ch != 0))
+                   break;
+
+                 outbuf[outchars] = from_ucs4[ch];
+                 ++do_write;
+                 ++outchars;
+                 cnt += sizeof (wchar_t);
+               }
+             *inbufsize -= cnt;
+             data->outbufavail = outchars;
+
+             if (outchars < 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_8bit
+                                     ? 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;
+}