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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2022-06-01 00:10:22 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2022-06-02 17:26:53 +0200
commita36cf2824c74a3ba7333801268d0ba4194684423 (patch)
treef1fd950ea37bf6c91af7a154f90f5e6eb8b70e01 /lib/sqfs/readdir.c
parentfa7110a9c4bd0ece4be33998b6f9e7d4f528acc7 (diff)
Cleanup: libsqfs: move directory iteration out of the directory reader
Add a simple directory state object to the meta data reader and use that to iterate directory entries. The code for reading the directory listing is movde to readdir.c Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/sqfs/readdir.c')
-rw-r--r--lib/sqfs/readdir.c95
1 files changed, 95 insertions, 0 deletions
diff --git a/lib/sqfs/readdir.c b/lib/sqfs/readdir.c
index 8899475..e2dbcd4 100644
--- a/lib/sqfs/readdir.c
+++ b/lib/sqfs/readdir.c
@@ -9,6 +9,8 @@
#include "sqfs/meta_reader.h"
#include "sqfs/error.h"
+#include "sqfs/super.h"
+#include "sqfs/inode.h"
#include "sqfs/dir.h"
#include "compat.h"
@@ -64,3 +66,96 @@ int sqfs_meta_reader_read_dir_ent(sqfs_meta_reader_t *m,
*result = out;
return 0;
}
+
+int sqfs_readdir_state_init(sqfs_readdir_state_t *s, const sqfs_super_t *super,
+ const sqfs_inode_generic_t *inode)
+{
+ memset(s, 0, sizeof(*s));
+
+ if (inode->base.type == SQFS_INODE_DIR) {
+ s->init.block = inode->data.dir.start_block;
+ s->init.offset = inode->data.dir.offset;
+ s->init.size = inode->data.dir.size;
+ } else if (inode->base.type == SQFS_INODE_EXT_DIR) {
+ s->init.block = inode->data.dir_ext.start_block;
+ s->init.offset = inode->data.dir_ext.offset;
+ s->init.size = inode->data.dir_ext.size;
+ } else {
+ return SQFS_ERROR_NOT_DIR;
+ }
+
+ s->init.block += super->directory_table_start;
+ s->current = s->init;
+ return 0;
+}
+
+int sqfs_meta_reader_readdir(sqfs_meta_reader_t *m, sqfs_readdir_state_t *it,
+ sqfs_dir_entry_t **ent,
+ sqfs_u32 *inum, sqfs_u64 *iref)
+{
+ size_t count;
+ int ret;
+
+ if (it->entries == 0) {
+ sqfs_dir_header_t hdr;
+
+ if (it->current.size <= sizeof(hdr))
+ goto out_eof;
+
+ ret = sqfs_meta_reader_seek(m, it->current.block,
+ it->current.offset);
+ if (ret != 0)
+ return ret;
+
+ ret = sqfs_meta_reader_read_dir_header(m, &hdr);
+ if (ret != 0)
+ return ret;
+
+ sqfs_meta_reader_get_position(m, &it->current.block,
+ &it->current.offset);
+
+ it->current.size -= sizeof(hdr);
+ it->entries = hdr.count + 1;
+ it->inum_base = hdr.inode_number;
+ it->inode_block = hdr.start_block;
+ }
+
+ if (it->current.size <= sizeof(**ent))
+ goto out_eof;
+
+ ret = sqfs_meta_reader_seek(m, it->current.block, it->current.offset);
+ if (ret != 0)
+ return ret;
+
+ ret = sqfs_meta_reader_read_dir_ent(m, ent);
+ if (ret)
+ return ret;
+
+ sqfs_meta_reader_get_position(m, &it->current.block,
+ &it->current.offset);
+
+ it->current.size -= sizeof(**ent);
+ it->entries -= 1;
+
+ count = (*ent)->size + 1;
+
+ if (count >= it->current.size) {
+ it->current.size = 0;
+ } else {
+ it->current.size -= count;
+ }
+
+ if (inum != NULL)
+ *inum = it->inum_base + (*ent)->inode_diff;
+
+ if (iref != NULL) {
+ *iref = (sqfs_u64)it->inode_block << 16UL;
+ *iref |= (*ent)->offset;
+ }
+
+ return 0;
+out_eof:
+ it->current.size = 0;
+ it->entries = 0;
+ return 1;
+}