1 files changed, 106 insertions, 0 deletions
diff --git a/g10/textfilter.c b/g10/textfilter.c
new file mode 100644
index 000000000..e57b429e8
--- /dev/null
+++ b/g10/textfilter.c
@@ -0,0 +1,106 @@
+/* textfilter.c
+ *	Copyright (c) 1997 by Werner Koch (dd9jn)
+ *
+ * This file is part of G10.
+ *
+ * G10 is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * G10 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+
+#include "errors.h"
+#include "iobuf.h"
+#include "memory.h"
+#include "util.h"
+#include "filter.h"
+
+
+/****************
+ * The filter is used to make canonical text: Lines are terminated by
+ * CR, LF, trailing white spaces are removed.
+ */
+int
+text_filter( void *opaque, int control,
+	     IOBUF a, byte *buf, size_t *ret_len)
+{
+    size_t size = *ret_len;
+    text_filter_context_t *tfx = opaque;
+    int i, c, rc=0;
+    byte *p;
+
+    if( control == IOBUFCTRL_UNDERFLOW ) {
+	for(i=0; i < size; i++ ) {
+	    if( !tfx->linelen && !tfx->eof ) { /* read a complete line */
+		for(;;) {
+		    if( (c = iobuf_get(a)) == -1 ) {
+			tfx->eof=1;
+			break;
+		    }
+		    if( c == '\n' )
+			break;
+		    if( tfx->linelen >= tfx->linesize ) {
+			tfx->linesize += 500;
+			tfx->line = m_realloc( tfx->line, tfx->linesize );
+		    }
+		    tfx->line[tfx->linelen++] = c;
+		}
+		/* remove trailing white spaces */
+		p = tfx->line + tfx->linelen - 1;
+		for( ; p >= tfx->line; p--, tfx->linelen-- ) {
+		    if( *p != ' ' && *p == '\t' && *p != '\r' )
+			break;
+		}
+		if( tfx->linelen+2 >= tfx->linesize ) {
+		    tfx->linesize += 10;
+		    tfx->line = m_realloc( tfx->line, tfx->linesize );
+		}
+		tfx->line[tfx->linelen++] = '\r';
+		tfx->line[tfx->linelen++] = '\n';
+		tfx->pos=0;
+	    }
+	    if( tfx->pos < tfx->linelen )
+		buf[i] = tfx->line[tfx->pos++];
+	    else if( tfx->eof )
+		break;
+	    else
+		tfx->linelen = 0;
+	}
+	if( !i )
+	    rc = -1;
+	*ret_len = i;
+    }
+    else if( control == IOBUFCTRL_INIT ) {
+	tfx->linesize = 500;
+	tfx->line = m_alloc(tfx->linesize);
+	tfx->linelen = 0;
+	tfx->pos = 0;
+	tfx->eof = 0;
+    }
+    else if( control == IOBUFCTRL_FREE ) {
+	m_free( tfx->line );
+	tfx->line = NULL;
+    }
+    else if( control == IOBUFCTRL_DESC )
+	*(char**)buf = "text_filter";
+    return rc;
+}
+
+
+