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path: root/fs/cifs/cifs_unicode.c
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-rw-r--r--fs/cifs/cifs_unicode.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/fs/cifs/cifs_unicode.c b/fs/cifs/cifs_unicode.c
index 8389f359b03d..614512573c67 100644
--- a/fs/cifs/cifs_unicode.c
+++ b/fs/cifs/cifs_unicode.c
@@ -26,6 +26,37 @@
#include "cifs_debug.h"
/*
+ * cifs_ucs2_bytes - how long will a string be after conversion?
+ * @ucs - pointer to input string
+ * @maxbytes - don't go past this many bytes of input string
+ * @codepage - destination codepage
+ *
+ * Walk a ucs2le string and return the number of bytes that the string will
+ * be after being converted to the given charset, not including any null
+ * termination required. Don't walk past maxbytes in the source buffer.
+ */
+int
+cifs_ucs2_bytes(const __le16 *from, int maxbytes,
+ const struct nls_table *codepage)
+{
+ int i;
+ int charlen, outlen = 0;
+ int maxwords = maxbytes / 2;
+ char tmp[NLS_MAX_CHARSET_SIZE];
+
+ for (i = 0; from[i] && i < maxwords; i++) {
+ charlen = codepage->uni2char(le16_to_cpu(from[i]), tmp,
+ NLS_MAX_CHARSET_SIZE);
+ if (charlen > 0)
+ outlen += charlen;
+ else
+ outlen++;
+ }
+
+ return outlen;
+}
+
+/*
* cifs_mapchar - convert a little-endian char to proper char in codepage
* @target - where converted character should be copied
* @src_char - 2 byte little-endian source character