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authorJeff Layton <jlayton@redhat.com>2009-04-30 06:46:32 -0400
committerSteve French <sfrench@us.ibm.com>2009-04-30 15:45:00 +0000
commit69f801fcaa03be83d58c564f00913b7c172808e4 (patch)
tree35e359acc85bef8669b001ccb412afb96d256a82 /fs/cifs/cifs_unicode.c
parent7fabf0c9479fef9fdb9528a5fbdb1cb744a744a4 (diff)
downloadlinux-stericsson-69f801fcaa03be83d58c564f00913b7c172808e4.tar.gz
cifs: add new function to get unicode string length in bytes
Working in units of words means we do a lot of unnecessary conversion back and forth. Standardize on bytes instead since that's more useful for allocating buffers and such. Also, remove hostlen_fromUCS since the new function has a similar purpose. Signed-off-by: Jeff Layton <jlayton@redhat.com> Acked-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs/cifs/cifs_unicode.c')
-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