Changeset 2d0d637 in mainline for uspace/srv/fs/fat/fat_dentry.c

Timestamp:

2011-06-21T18:56:31Z (14 years ago)

Author:

Oleg Romanenko <romanenko.oleg@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

61e29a4d

Parents:

9553d7d

Message:

Functions for checking string compatibility with SFN requirements

File:

• uspace/srv/fs/fat/fat_dentry.c (modified) (1 diff)

uspace/srv/fs/fat/fat_dentry.c

@@ -394 +394 @@
 }
 
+bool fat_lfn_valid_char(uint16_t c)
+{
+        char valid[] = {"_.$%\'-@~!(){}^#&"};
+        size_t idx=0;
+
+        if (c > 0xff) return false;
+        if (isdigit(c) || (isalpha(c) && isupper(c)))
+                return true;    
+        while(valid[idx]!=0)
+                if (c == valid[idx++])
+                        return true;
+
+        return false;
+}
+
+bool fat_lfn_valid_str(const uint16_t *str)
+{
+        uint16_t c;
+        size_t idx=0;
+        if (str[idx] == 0 || str[idx] == '.')
+                return false;
+        while ((c=str[idx++]) != 0) {
+                if (!fat_lfn_valid_char(c))
+                        return false;
+        }
+        return true;
+}
+
+/** Get number of characters in a wide string.
+ *
+ * @param str NULL-terminated wide string.
+ *
+ * @return Number of characters in @a str.
+ *
+ */
+size_t utf16_length(const uint16_t *wstr)
+{
+        size_t len = 0;
+        
+        while (*wstr++ != 0)
+                len++;
+        return len;
+}
+
+bool fat_dentry_is_sfn(const uint16_t *str)
+{
+        /* 1. Length <= 11 characters */
+        if (utf16_length(str) > (FAT_NAME_LEN + FAT_EXT_LEN))
+                return false;
+        /* 
+         * 2. All characters in string should be ASCII
+         * 3. All letters must be uppercase
+         * 4. String should not contain invalid characters
+         */
+        if (!fat_lfn_valid_str(str))
+                return false;
+        
+        return true;
+}
+
 
 /**