Changeset d8df2fb in mainline

Timestamp:

2011-08-14T19:31:52Z (13 years ago)

Author:

Oleg Romanenko <romanenko.oleg@…>

Branches:

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

Children:

4ba3535

Parents:

151a4e2

Message:

exFAT: implement exfat_directory_sync_file

File:

• uspace/srv/fs/exfat/exfat_directory.c (modified) (2 diffs)

uspace/srv/fs/exfat/exfat_directory.c

@@ -42 +42 @@
 #include <byteorder.h>
 #include <mem.h>
+#include <malloc.h>
 #include <str.h>
 
@@ -249 +250 @@
 }
 
-int exfat_directory_sync_file(exfat_directory_t *di, 
-    exfat_file_dentry_t *df, exfat_stream_dentry_t *ds)
-{
+static uint16_t exfat_directory_set_checksum(const uint8_t *bytes, size_t count)
+{
+        uint16_t checksum = 0;
+        size_t idx;
+
+        for (idx = 0; idx < count; idx++) {
+                if (idx == 2 || idx == 3)
+                        continue;
+                checksum = ((checksum << 15) | (checksum >> 1)) + (uint16_t)bytes[idx];
+        }
+        return checksum;
+}
+
+int exfat_directory_sync_file(exfat_directory_t *di, exfat_file_dentry_t *df, 
+    exfat_stream_dentry_t *ds)
+{
+        int rc, i, count;
+        exfat_dentry_t *array=NULL, *de;
+        aoff64_t pos = di->pos;
+
+        rc = exfat_directory_get(di, &de);
+        if (rc != EOK)
+                return rc;
+        count = de->file.count+1;
+        array = (exfat_dentry_t *) malloc(count*sizeof(exfat_dentry_t));
+        if (!array)
+                return ENOMEM;
+        for (i=0; i<count; i++) {
+                rc = exfat_directory_get(di, &de);
+                if (rc != EOK)
+                        return rc;
+                memcpy((uint8_t *)&array[i], (uint8_t *)de, sizeof(exfat_dentry_t));
+                rc = exfat_directory_next(di);
+                if (rc!=EOK) {
+                        free(array);
+                        return rc;
+                }
+        }
+        rc = exfat_directory_seek(di, pos);
+        if (rc!=EOK) {
+                free(array);
+                return rc;
+        }
+
+        /* Sync */
+        array[0].file.attr = df->attr;
+        array[1].stream.firstc = ds->firstc;
+        array[1].stream.flags = ds->flags;
+        array[1].stream.valid_data_size = ds->valid_data_size;
+        array[1].stream.data_size = ds->data_size;
+        array[0].file.checksum = exfat_directory_set_checksum((uint8_t *)array,
+            count*sizeof(exfat_dentry_t));
+
+        /* Store */
+        for (i=0; i<count; i++) {
+                rc = exfat_directory_get(di, &de);
+                if (rc != EOK)
+                        return rc;
+                memcpy((uint8_t *)de, (uint8_t *)&array[i], sizeof(exfat_dentry_t));
+                di->b->dirty = true;
+                rc = exfat_directory_next(di);
+                if (rc!=EOK) {
+                        free(array);
+                        return rc;
+                }
+        }
+
         return EOK;
 }