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-rw-r--r--libmailutils/linelenflt.c110
1 files changed, 110 insertions, 0 deletions
diff --git a/libmailutils/linelenflt.c b/libmailutils/linelenflt.c
new file mode 100644
index 000000000..e3817de9f
--- /dev/null
+++ b/libmailutils/linelenflt.c
@@ -0,0 +1,110 @@
+/* GNU Mailutils -- a suite of utilities for electronic mail
+ Copyright (C) 2009, 2010 Free Software Foundation, Inc.
+
+ This 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 3, or (at your option)
+ any later version.
+
+ This 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 GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+#include <stdlib.h>
+#include <string.h>
+#include <mailutils/errno.h>
+#include <mailutils/filter.h>
+
+struct _mu_linelen_filter
+{
+ size_t max_len;
+ size_t cur_len;
+};
+
+static enum mu_filter_result
+_ll_encoder (void *xd,
+ enum mu_filter_command cmd,
+ struct mu_filter_io *iobuf)
+{
+ struct _mu_linelen_filter *flt = xd;
+ const char *iptr;
+ size_t isize;
+ char *optr;
+ size_t osize;
+ size_t consumed, written;
+
+ switch (cmd)
+ {
+ case mu_filter_init:
+ flt->cur_len = 0;
+ case mu_filter_done:
+ return mu_filter_ok;
+ default:
+ break;
+ }
+
+ iptr = iobuf->input;
+ isize = iobuf->isize;
+ optr = iobuf->output;
+ osize = iobuf->osize;
+
+ for (consumed = written = 0; consumed < isize && written < osize; )
+ {
+ char *p;
+ size_t rest = flt->max_len - flt->cur_len;
+ size_t len = isize - consumed;
+
+ if (len > rest)
+ len = rest;
+
+ p = memchr (iptr + consumed, '\n', len);
+ if (p)
+ len = p - iptr - consumed + 1;
+
+ rest = osize - written;
+ if (len > rest)
+ {
+ len = rest;
+ p = NULL;
+ }
+ memcpy (optr + written, iptr + consumed, len);
+ written += len;
+ consumed += len;
+ if (p)
+ flt->cur_len = 0;
+ else
+ {
+ flt->cur_len += len;
+ if (flt->cur_len == flt->max_len)
+ {
+ if (written < osize)
+ optr[written++] = '\n';
+ flt->cur_len = 0;
+ }
+ }
+ }
+ iobuf->isize = consumed;
+ iobuf->osize = written;
+ return mu_filter_ok;
+}
+
+int
+mu_linelen_filter_create (mu_stream_t *pstream, mu_stream_t stream,
+ size_t limit,
+ int flags)
+{
+ struct _mu_linelen_filter *flt = calloc (1, sizeof (*flt));
+ if (!flt)
+ return ENOMEM;
+ flt->max_len = limit;
+ return mu_filter_stream_create (pstream, stream,
+ MU_FILTER_ENCODE, _ll_encoder, flt, flags);
+}
+

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