libsqfs: Add a helper function for turning an inode into a dir entry

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

3 files changed, 84 insertions, 57 deletions

diff --git a/include/sqfs/inode.h b/include/sqfs/inode.h
index 7f4e7b5..ba9c227 100644
--- a/include/sqfs/inode.h
+++ b/include/sqfs/inode.h
@@ -741,6 +741,23 @@ int sqfs_inode_unpack_dir_index_entry(const sqfs_inode_generic_t *inode,
 				      sqfs_dir_index_t **out,
 				      size_t index);
 
+/**
+ * @brief Create a directory entry from an inode
+ *
+ * @param name The file name or path to store in the directory entry
+ * @param len The lengh of the file name, or 0 to use strlen internally
+ * @param inode The inode from which to use the data
+ * @param idtbl An ID table to use for resolving the inodes uid & gid
+ * @param out Returns a pointer to a @ref sqfs_dir_entry_t on success
+ *
+ * @return Zero on success, a negative @ref SQFS_ERROR value on failure
+ */
+SQFS_API
+int sqfs_dir_entry_from_inode(const char *name, size_t len,
+			      const sqfs_inode_generic_t *inode,
+			      const sqfs_id_table_t *idtbl,
+			      sqfs_dir_entry_t **out);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/sqfs/src/dir_iterator.c b/lib/sqfs/src/dir_iterator.c
index 3e1f63a..32612cf 100644
--- a/lib/sqfs/src/dir_iterator.c
+++ b/lib/sqfs/src/dir_iterator.c
@@ -39,7 +39,6 @@ static int it_next(sqfs_dir_iterator_t *base, sqfs_dir_entry_t **out)
 {
 	iterator_t *it = (iterator_t *)base;
 	sqfs_dir_entry_t *ent = NULL;
-	sqfs_u32 uid, gid;
 	int ret;
 
 	sqfs_free(it->inode);
@@ -55,65 +54,14 @@ static int it_next(sqfs_dir_iterator_t *base, sqfs_dir_entry_t **out)
 	if (ret != 0)
 		goto fail;
 
-	ret = SQFS_ERROR_ALLOC;
-	ent = alloc_flex(sizeof(*ent), 1, it->dent->size + 2);
-	if (ent == NULL)
+	ret = sqfs_dir_entry_from_inode((const char *)it->dent->name,
+					it->dent->size + 1, it->inode,
+					it->id, &ent);
+	if (ret)
 		goto fail;
 
-	ret = SQFS_ERROR_CORRUPTED;
-	if (sqfs_id_table_index_to_id(it->id, it->inode->base.uid_idx, &uid))
-		goto fail;
-
-	if (sqfs_id_table_index_to_id(it->id, it->inode->base.gid_idx, &gid))
-		goto fail;
-
-	memcpy(ent->name, it->dent->name, it->dent->size + 1);
-
-	ent->mode = it->inode->base.mode;
-	ent->mtime = it->inode->base.mod_time;
-	ent->uid = uid;
-	ent->gid = gid;
 	ent->inode = it->state.ent_ref;
-	it->xattr_idx = 0xFFFFFFFF;
-
-	switch (it->inode->base.type) {
-	case SQFS_INODE_BDEV:
-	case SQFS_INODE_CDEV:
-		ent->rdev = it->inode->data.dev.devno;
-		break;
-	case SQFS_INODE_EXT_BDEV:
-	case SQFS_INODE_EXT_CDEV:
-		ent->rdev = it->inode->data.dev_ext.devno;
-		it->xattr_idx = it->inode->data.dev_ext.xattr_idx;
-		break;
-	case SQFS_INODE_FILE:
-		ent->size = it->inode->data.file.file_size;
-		break;
-	case SQFS_INODE_EXT_FILE:
-		ent->size = it->inode->data.file_ext.file_size;
-		it->xattr_idx = it->inode->data.file_ext.xattr_idx;
-		break;
-	case SQFS_INODE_DIR:
-		ent->size = it->inode->data.dir.size;
-		break;
-	case SQFS_INODE_EXT_DIR:
-		ent->size = it->inode->data.dir_ext.size;
-		it->xattr_idx = it->inode->data.dir_ext.xattr_idx;
-		break;
-	case SQFS_INODE_SLINK:
-		ent->size = it->inode->data.slink.target_size;
-		break;
-	case SQFS_INODE_EXT_SLINK:
-		ent->size = it->inode->data.slink_ext.target_size;
-		it->xattr_idx = it->inode->data.slink_ext.xattr_idx;
-		break;
-	case SQFS_INODE_EXT_FIFO:
-	case SQFS_INODE_EXT_SOCKET:
-		it->xattr_idx = it->inode->data.ipc_ext.xattr_idx;
-		break;
-	default:
-		break;
-	}
+	sqfs_inode_get_xattr_index(it->inode, &it->xattr_idx);
 
 	*out = ent;
 	return 0;
diff --git a/lib/sqfs/src/inode.c b/lib/sqfs/src/inode.c
index ce51cf5..4966126 100644
--- a/lib/sqfs/src/inode.c
+++ b/lib/sqfs/src/inode.c
@@ -7,6 +7,8 @@
 #define SQFS_BUILDING_DLL
 #include "config.h"
 
+#include "sqfs/dir_entry.h"
+#include "sqfs/id_table.h"
 #include "sqfs/inode.h"
 #include "sqfs/error.h"
 #include "sqfs/dir.h"
@@ -378,3 +380,63 @@ int sqfs_inode_unpack_dir_index_entry(const sqfs_inode_generic_t *inode,
 	memcpy((*out)->name, ptr + offset + sizeof(ent), ent.size + 1);
 	return 0;
 }
+
+int sqfs_dir_entry_from_inode(const char *name, size_t len,
+			      const sqfs_inode_generic_t *inode,
+			      const sqfs_id_table_t *idtbl,
+			      sqfs_dir_entry_t **out)
+{
+	sqfs_dir_entry_t *ent;
+	sqfs_u32 uid, gid;
+
+	if (sqfs_id_table_index_to_id(idtbl, inode->base.uid_idx, &uid))
+		return SQFS_ERROR_CORRUPTED;
+
+	if (sqfs_id_table_index_to_id(idtbl, inode->base.gid_idx, &gid))
+		return SQFS_ERROR_CORRUPTED;
+
+	len = len > 0 ? strnlen(name, len) : strlen(name);
+	ent = alloc_flex(sizeof(*ent), 1, len + 1);
+	if (ent == NULL)
+		return SQFS_ERROR_ALLOC;
+
+	memcpy(ent->name, name, len);
+	ent->mode = inode->base.mode;
+	ent->mtime = inode->base.mod_time;
+	ent->uid = uid;
+	ent->gid = gid;
+
+	switch (inode->base.type) {
+	case SQFS_INODE_BDEV:
+	case SQFS_INODE_CDEV:
+		ent->rdev = inode->data.dev.devno;
+		break;
+	case SQFS_INODE_EXT_BDEV:
+	case SQFS_INODE_EXT_CDEV:
+		ent->rdev = inode->data.dev_ext.devno;
+		break;
+	case SQFS_INODE_FILE:
+		ent->size = inode->data.file.file_size;
+		break;
+	case SQFS_INODE_EXT_FILE:
+		ent->size = inode->data.file_ext.file_size;
+		break;
+	case SQFS_INODE_DIR:
+		ent->size = inode->data.dir.size;
+		break;
+	case SQFS_INODE_EXT_DIR:
+		ent->size = inode->data.dir_ext.size;
+		break;
+	case SQFS_INODE_SLINK:
+		ent->size = inode->data.slink.target_size;
+		break;
+	case SQFS_INODE_EXT_SLINK:
+		ent->size = inode->data.slink_ext.target_size;
+		break;
+	default:
+		break;
+	}
+
+	*out = ent;
+	return 0;
+}