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-rw-r--r--fs/jfs/jfs_unicode.c125
1 files changed, 125 insertions, 0 deletions
diff --git a/fs/jfs/jfs_unicode.c b/fs/jfs/jfs_unicode.c
new file mode 100644
index 0000000000..0c1e902724
--- /dev/null
+++ b/fs/jfs/jfs_unicode.c
@@ -0,0 +1,125 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) International Business Machines Corp., 2000-2004
+ */
+
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include "jfs_incore.h"
+#include "jfs_filsys.h"
+#include "jfs_unicode.h"
+#include "jfs_debug.h"
+
+/*
+ * NAME: jfs_strfromUCS()
+ *
+ * FUNCTION: Convert little-endian unicode string to character string
+ *
+ */
+int jfs_strfromUCS_le(char *to, const __le16 * from,
+ int len, struct nls_table *codepage)
+{
+ int i;
+ int outlen = 0;
+ static int warn_again = 5; /* Only warn up to 5 times total */
+ int warn = !!warn_again; /* once per string */
+
+ if (codepage) {
+ for (i = 0; (i < len) && from[i]; i++) {
+ int charlen;
+ charlen =
+ codepage->uni2char(le16_to_cpu(from[i]),
+ &to[outlen],
+ NLS_MAX_CHARSET_SIZE);
+ if (charlen > 0)
+ outlen += charlen;
+ else
+ to[outlen++] = '?';
+ }
+ } else {
+ for (i = 0; (i < len) && from[i]; i++) {
+ if (unlikely(le16_to_cpu(from[i]) & 0xff00)) {
+ to[i] = '?';
+ if (unlikely(warn)) {
+ warn--;
+ warn_again--;
+ printk(KERN_ERR
+ "non-latin1 character 0x%x found in JFS file name\n",
+ le16_to_cpu(from[i]));
+ printk(KERN_ERR
+ "mount with iocharset=utf8 to access\n");
+ }
+
+ }
+ else
+ to[i] = (char) (le16_to_cpu(from[i]));
+ }
+ outlen = i;
+ }
+ to[outlen] = 0;
+ return outlen;
+}
+
+/*
+ * NAME: jfs_strtoUCS()
+ *
+ * FUNCTION: Convert character string to unicode string
+ *
+ */
+static int jfs_strtoUCS(wchar_t * to, const unsigned char *from, int len,
+ struct nls_table *codepage)
+{
+ int charlen;
+ int i;
+
+ if (codepage) {
+ for (i = 0; len && *from; i++, from += charlen, len -= charlen)
+ {
+ charlen = codepage->char2uni(from, len, &to[i]);
+ if (charlen < 1) {
+ jfs_err("jfs_strtoUCS: char2uni returned %d.",
+ charlen);
+ jfs_err("charset = %s, char = 0x%x",
+ codepage->charset, *from);
+ return charlen;
+ }
+ }
+ } else {
+ for (i = 0; (i < len) && from[i]; i++)
+ to[i] = (wchar_t) from[i];
+ }
+
+ to[i] = 0;
+ return i;
+}
+
+/*
+ * NAME: get_UCSname()
+ *
+ * FUNCTION: Allocate and translate to unicode string
+ *
+ */
+int get_UCSname(struct component_name * uniName, struct dentry *dentry)
+{
+ struct nls_table *nls_tab = JFS_SBI(dentry->d_sb)->nls_tab;
+ int length = dentry->d_name.len;
+
+ if (length > JFS_NAME_MAX)
+ return -ENAMETOOLONG;
+
+ uniName->name =
+ kmalloc_array(length + 1, sizeof(wchar_t), GFP_NOFS);
+
+ if (uniName->name == NULL)
+ return -ENOMEM;
+
+ uniName->namlen = jfs_strtoUCS(uniName->name, dentry->d_name.name,
+ length, nls_tab);
+
+ if (uniName->namlen < 0) {
+ kfree(uniName->name);
+ return uniName->namlen;
+ }
+
+ return 0;
+}