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-rw-r--r--include/sqfs/inode.h18
-rw-r--r--lib/sqfs/inode.c49
2 files changed, 67 insertions, 0 deletions
diff --git a/include/sqfs/inode.h b/include/sqfs/inode.h
index 336a394..2b4a550 100644
--- a/include/sqfs/inode.h
+++ b/include/sqfs/inode.h
@@ -537,6 +537,24 @@ extern "C" {
#endif
/**
+ * @brief Create a deep copy of a generic inode.
+ *
+ * The @ref sqfs_inode_generic_t structure contains inlined fields that have a
+ * size depending on the inode data and pointers to the inlined fields. This
+ * helper function calculates the actual size of the structure in memory, makes
+ * a copy and propperly sets up the pointers.
+ *
+ * @param src The inode to copy.
+ * @param copy Returns a pointer to the copy on success. Can be released with a
+ * single free call.
+ *
+ * @return Zero on success, an @ref SQFS_ERROR_CORRUPTED if the node has
+ * an unknown type set.
+ */
+SQFS_API int sqfs_inode_copy(const sqfs_inode_generic_t *src,
+ sqfs_inode_generic_t **copy);
+
+/**
* @brief Get the extended attribute index of an inode
*
* For basic inodes, this returns the inode index 0xFFFFFFFF, i.e. the
diff --git a/lib/sqfs/inode.c b/lib/sqfs/inode.c
index 4a75e64..bb1ccef 100644
--- a/lib/sqfs/inode.c
+++ b/lib/sqfs/inode.c
@@ -10,6 +10,9 @@
#include "sqfs/inode.h"
#include "sqfs/error.h"
+#include <string.h>
+#include <stdlib.h>
+
static int inverse_type[] = {
[SQFS_INODE_DIR] = SQFS_INODE_EXT_DIR,
[SQFS_INODE_FILE] = SQFS_INODE_EXT_FILE,
@@ -27,6 +30,52 @@ static int inverse_type[] = {
[SQFS_INODE_EXT_SOCKET] = SQFS_INODE_SOCKET,
};
+int sqfs_inode_copy(const sqfs_inode_generic_t *src,
+ sqfs_inode_generic_t **out)
+{
+ sqfs_inode_generic_t *copy;
+ size_t size = sizeof(*src);
+
+ switch (src->base.type) {
+ case SQFS_INODE_FILE:
+ case SQFS_INODE_EXT_FILE:
+ size += src->num_file_blocks;
+ break;
+ case SQFS_INODE_DIR:
+ case SQFS_INODE_EXT_DIR:
+ size += src->num_dir_idx_bytes;
+ break;
+ case SQFS_INODE_SLINK:
+ size += src->data.slink.target_size;
+ break;
+ case SQFS_INODE_EXT_SLINK:
+ size += src->data.slink_ext.target_size;
+ break;
+ case SQFS_INODE_BDEV:
+ case SQFS_INODE_CDEV:
+ case SQFS_INODE_FIFO:
+ case SQFS_INODE_SOCKET:
+ case SQFS_INODE_EXT_BDEV:
+ case SQFS_INODE_EXT_CDEV:
+ case SQFS_INODE_EXT_FIFO:
+ case SQFS_INODE_EXT_SOCKET:
+ break;
+ default:
+ return SQFS_ERROR_CORRUPTED;
+ }
+
+ copy = calloc(1, size);
+ if (copy == NULL)
+ return SQFS_ERROR_ALLOC;
+
+ memcpy(copy, src, size);
+ copy->block_sizes = (sqfs_u32 *)copy->extra;
+ copy->slink_target = (char *)copy->extra;
+
+ *out = copy;
+ return 0;
+}
+
int sqfs_inode_get_xattr_index(const sqfs_inode_generic_t *inode,
sqfs_u32 *out)
{