Changeset 392bd67c in mainline

Timestamp:

2012-02-25T13:44:27Z (12 years ago)

Author:

Maurizio Lombardi <m.lombardi85@…>

Branches:

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

Children:

da34d61d

Parents:

ba55c194

Message:

mkexfat: add function that computes the checksum value of the upcase table.

File:

• uspace/app/mkexfat/mkexfat.c (modified) (1 diff)

uspace/app/mkexfat/mkexfat.c

@@ -569 +569 @@
 }
 
+/** Compute the checksum of the upcase table.
+ *
+ * @param data   Pointer to the upcase table.
+ * @param nbytes size of the upcase table in bytes.
+ * @return   Checksum value.
+ */
+static uint32_t
+upcase_table_checksum(void const *data, size_t nbytes)
+{
+        size_t index;
+        uint32_t chksum = 0;
+        uint8_t const *octets = (uint8_t *) data;
+
+        for (index = 0; index < nbytes; ++index)
+                chksum = ((chksum << 31) | (chksum >> 1)) + octets[index];
+
+        return chksum;
+}
+
 int main (int argc, char **argv)
 {