Add function prototypes and base module for kernel side iconv library.

Add simple "xlat" converter which performs 8to8 table based conversion.
Unicode converter will be added in the near future.

Reviewed by:			silence on arch@
Files placement reviewed by:	bde
Obtained from:			smbfs

1 files changed, 124 insertions, 0 deletions

diff --git a/sys/libkern/iconv_xlat.c b/sys/libkern/iconv_xlat.c
new file mode 100644
index 0000000..6dd2800
--- /dev/null
+++ b/sys/libkern/iconv_xlat.c
@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 2000-2001, Boris Popov
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *    This product includes software developed by Boris Popov.
+ * 4. Neither the name of the author nor the names of any co-contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/systm.h>
+#include <sys/malloc.h>
+#include <sys/iconv.h>
+
+#include "iconv_converter_if.h"
+
+/*
+ * "XLAT" converter
+ */
+
+#ifdef MODULE_DEPEND
+MODULE_DEPEND(iconv_xlat, libiconv, 1, 1, 1);
+#endif
+
+/*
+ * XLAT converter instance
+ */
+struct iconv_xlat {
+	KOBJ_FIELDS;
+	u_char *		d_table;
+	struct iconv_cspair *	d_csp;
+};
+
+static int
+iconv_xlat_open(struct iconv_converter_class *dcp,
+	struct iconv_cspair *csp, struct iconv_cspair *cspf, void **dpp)
+{
+	struct iconv_xlat *dp;
+
+	dp = (struct iconv_xlat *)kobj_create((struct kobj_class*)dcp, M_ICONV, M_WAITOK);
+	dp->d_table = csp->cp_data;
+	dp->d_csp = csp;
+	csp->cp_refcount++;
+	*dpp = (void*)dp;
+	return 0;
+}
+
+static int
+iconv_xlat_close(void *data)
+{
+	struct iconv_xlat *dp = data;
+
+	dp->d_csp->cp_refcount--;
+	kobj_delete((struct kobj*)data, M_ICONV);
+	return 0;
+}
+
+static int
+iconv_xlat_conv(void *d2p, const char **inbuf,
+	size_t *inbytesleft, char **outbuf, size_t *outbytesleft)
+{
+	struct iconv_xlat *dp = (struct iconv_xlat*)d2p;
+	const char *src;
+	char *dst;
+	int n, r;
+
+	if (inbuf == NULL || *inbuf == NULL || outbuf == NULL || *outbuf == NULL)
+		return 0;
+	r = n = min(*inbytesleft, *outbytesleft);
+	src = *inbuf;
+	dst = *outbuf;
+	while(r--)
+		*dst++ = dp->d_table[(u_char)*src++];
+	*inbuf += n;
+	*outbuf += n;
+	*inbytesleft += n;
+	*outbytesleft -= n;
+	return 0;
+}
+
+static const char *
+iconv_xlat_name(struct iconv_converter_class *dcp)
+{
+	return "xlat";
+}
+
+static kobj_method_t iconv_xlat_methods[] = {
+	KOBJMETHOD(iconv_converter_open,	iconv_xlat_open),
+	KOBJMETHOD(iconv_converter_close,	iconv_xlat_close),
+	KOBJMETHOD(iconv_converter_conv,	iconv_xlat_conv),
+#if 0
+	KOBJMETHOD(iconv_converter_init,	iconv_xlat_init),
+	KOBJMETHOD(iconv_converter_done,	iconv_xlat_done),
+#endif
+	KOBJMETHOD(iconv_converter_name,	iconv_xlat_name),
+	{0, 0}
+};
+
+KICONV_CONVERTER(xlat, sizeof(struct iconv_xlat));