*/
/*
- * Copyright (C) 2014 Eric Biggers
+ * Copyright (C) 2014-2016 Eric Biggers
*
* This file is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
#include "wimlib/endianness.h"
#include "wimlib/inode.h"
+#include "wimlib/object_id.h"
#include "wimlib/types.h"
#include "wimlib/unix_data.h"
-/* Used by the Microsoft implementation. */
+/* Object ID tag; this is also used by the Microsoft implementation. */
#define TAG_OBJECT_ID 0x00000001
/* Random number that we'll use for tagging our UNIX data items. */
le32 tag;
/* Size of the data of this tagged item, in bytes. This excludes this
- * header and should be a multiple of 8.
- *
- * (Actually, the MS implementation seems to round this up to an 8 byte
- * boundary when calculating the offset to the next tagged item, but
- * uses this length unmodified when validating the item. We might as
- * well do the same.) */
+ * header and should be a multiple of 8. */
le32 length;
/* Variable length data */
u8 data[];
};
+/* Unconfirmed: are all 64 bytes of the object ID always present? Since NTFS-3G
+ * permits shorter object IDs, we'll do the same for now. */
+#define OBJECT_ID_MIN_LENGTH 16
+
struct object_id_disk {
u8 object_id[16];
u8 birth_volume_id[16];
* NULL. */
static void *
inode_get_tagged_item(const struct wim_inode *inode,
- u32 desired_tag, u32 min_data_len)
+ u32 desired_tag, u32 min_data_len, u32 *actual_len_ret)
{
size_t minlen_with_hdr = sizeof(struct tagged_item_header) + min_data_len;
- size_t len_remaining = inode->i_extra_size;
- u8 *p = inode->i_extra;
+ size_t len_remaining;
+ u8 *p;
+
+ if (!inode->i_extra)
+ return NULL;
+
+ len_remaining = inode->i_extra->size;
+ p = inode->i_extra->data;
/* Iterate through the tagged items. */
while (len_remaining >= minlen_with_hdr) {
hdr = (struct tagged_item_header *)p;
tag = le32_to_cpu(hdr->tag);
- len = le32_to_cpu(hdr->length);
+ len = ALIGN(le32_to_cpu(hdr->length), 8);
- if (tag == desired_tag && len >= min_data_len)
+ /* Length overflow? */
+ if (unlikely(len > len_remaining - sizeof(struct tagged_item_header)))
+ return NULL;
+
+ /* Matches the item we wanted? */
+ if (tag == desired_tag && len >= min_data_len) {
+ if (actual_len_ret)
+ *actual_len_ret = len;
return hdr->data;
+ }
- len = (len + 7) & ~7;
- if (len_remaining <= sizeof(struct tagged_item_header) + len)
- return NULL;
len_remaining -= sizeof(struct tagged_item_header) + len;
p += sizeof(struct tagged_item_header) + len;
}
{
size_t itemsize;
size_t newsize;
- u8 *buf;
+ struct wim_inode_extra *extra;
struct tagged_item_header *hdr;
/* We prepend the item instead of appending it because it's easier. */
- itemsize = sizeof(struct tagged_item_header) + len;
- newsize = itemsize + inode->i_extra_size;
+ itemsize = sizeof(struct tagged_item_header) + ALIGN(len, 8);
+ newsize = itemsize;
+ if (inode->i_extra)
+ newsize += inode->i_extra->size;
- buf = MALLOC(newsize);
- if (!buf)
+ extra = MALLOC(sizeof(struct wim_inode_extra) + newsize);
+ if (!extra)
return NULL;
-
- if (inode->i_extra_size) {
- memcpy(buf + itemsize, inode->i_extra, inode->i_extra_size);
+ if (inode->i_extra) {
+ memcpy(&extra->data[itemsize], inode->i_extra->data,
+ inode->i_extra->size);
FREE(inode->i_extra);
}
- inode->i_extra = buf;
- inode->i_extra_size = newsize;
+ extra->size = newsize;
+ inode->i_extra = extra;
- hdr = (struct tagged_item_header *)buf;
+ hdr = (struct tagged_item_header *)extra->data;
hdr->tag = cpu_to_le32(tag);
hdr->length = cpu_to_le32(len);
- return hdr->data;
+ return memset(hdr->data, 0, ALIGN(len, 8));
}
static inline struct wimlib_unix_data_disk *
inode_get_unix_data_disk(const struct wim_inode *inode)
{
return inode_get_tagged_item(inode, TAG_WIMLIB_UNIX_DATA,
- sizeof(struct wimlib_unix_data_disk));
+ sizeof(struct wimlib_unix_data_disk),
+ NULL);
}
static inline struct wimlib_unix_data_disk *
p->rdev = cpu_to_le32(unix_data->rdev);
return true;
}
+
+/* Return %true iff the specified inode has an object ID. */
+bool
+inode_has_object_id(const struct wim_inode *inode)
+{
+ return inode_get_object_id(inode, NULL) != NULL;
+}
+
+/* Retrieve a pointer to the object ID of the specified inode and write its
+ * length to @len_ret. Return NULL if the inode does not have an object ID. */
+const void *
+inode_get_object_id(const struct wim_inode *inode, u32 *len_ret)
+{
+ return inode_get_tagged_item(inode, TAG_OBJECT_ID,
+ OBJECT_ID_MIN_LENGTH, len_ret);
+}
+
+/* Set the inode's object ID to the value specified by @object_id and @len.
+ * Assumes the inode didn't already have an object ID set. Returns %true if
+ * successful, %false if failed (out of memory). */
+bool
+inode_set_object_id(struct wim_inode *inode, const void *object_id, u32 len)
+{
+ void *p;
+
+ p = inode_add_tagged_item(inode, TAG_OBJECT_ID, len);
+ if (!p)
+ return false;
+
+ memcpy(p, object_id, len);
+ return true;
+}
git://wimlib.net / wimlib / blobdiff