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-rw-r--r--lib/sqfs/Makemodule.am2
-rw-r--r--lib/sqfs/read_tree.c291
2 files changed, 292 insertions, 1 deletions
diff --git a/lib/sqfs/Makemodule.am b/lib/sqfs/Makemodule.am
index 807c104..8dbb255 100644
--- a/lib/sqfs/Makemodule.am
+++ b/lib/sqfs/Makemodule.am
@@ -14,7 +14,7 @@ libsquashfs_la_SOURCES += lib/sqfs/read_inode.c lib/sqfs/write_inode.c
libsquashfs_la_SOURCES += lib/sqfs/dir_writer.c lib/sqfs/xattr_reader.c
libsquashfs_la_SOURCES += lib/sqfs/read_table.c lib/sqfs/comp/compressor.c
libsquashfs_la_SOURCES += lib/sqfs/io_stdin.c lib/sqfs/comp/internal.h
-libsquashfs_la_SOURCES += lib/sqfs/dir_reader.c
+libsquashfs_la_SOURCES += lib/sqfs/dir_reader.c lib/sqfs/read_tree.c
libsquashfs_la_SOURCES += lib/sqfs/blk_proc/process_block.c lib/sqfs/io.c
libsquashfs_la_SOURCES += lib/sqfs/blk_proc/internal.h
libsquashfs_la_CPPFLAGS = $(AM_CPPFLAGS)
diff --git a/lib/sqfs/read_tree.c b/lib/sqfs/read_tree.c
new file mode 100644
index 0000000..1cac26a
--- /dev/null
+++ b/lib/sqfs/read_tree.c
@@ -0,0 +1,291 @@
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/*
+ * read_tree.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#define SQFS_BUILDING_DLL
+#include "config.h"
+
+#include "sqfs/meta_reader.h"
+#include "sqfs/compress.h"
+#include "sqfs/id_table.h"
+#include "sqfs/super.h"
+#include "sqfs/inode.h"
+#include "sqfs/error.h"
+#include "sqfs/dir.h"
+#include "util.h"
+
+#include <string.h>
+#include <stdlib.h>
+
+static int should_skip(int type, unsigned int flags)
+{
+ switch (type) {
+ case SQFS_INODE_BDEV:
+ case SQFS_INODE_CDEV:
+ case SQFS_INODE_EXT_CDEV:
+ case SQFS_INODE_EXT_BDEV:
+ return (flags & SQFS_TREE_NO_DEVICES);
+ case SQFS_INODE_SLINK:
+ case SQFS_INODE_EXT_SLINK:
+ return (flags & SQFS_TREE_NO_SLINKS);
+ case SQFS_INODE_SOCKET:
+ case SQFS_INODE_EXT_SOCKET:
+ return(flags & SQFS_TREE_NO_SOCKETS);
+ case SQFS_INODE_FIFO:
+ case SQFS_INODE_EXT_FIFO:
+ return (flags & SQFS_TREE_NO_FIFO);
+ }
+
+ return 0;
+}
+
+static bool would_be_own_parent(sqfs_tree_node_t *parent, sqfs_tree_node_t *n)
+{
+ uint32_t inum = n->inode->base.inode_number;
+
+ while (parent != NULL) {
+ if (parent->inode->base.inode_number == inum)
+ return true;
+
+ parent = parent->parent;
+ }
+
+ return false;
+}
+
+static sqfs_tree_node_t *create_node(sqfs_inode_generic_t *inode,
+ const char *name)
+{
+ sqfs_tree_node_t *n;
+
+ n = alloc_flex(sizeof(*n), 1, strlen(name) + 1);
+ if (n == NULL)
+ return NULL;
+
+ n->inode = inode;
+ strcpy((char *)n->name, name);
+ return n;
+}
+
+static int fill_dir(sqfs_dir_reader_t *dr, sqfs_tree_node_t *root,
+ unsigned int flags)
+{
+ sqfs_tree_node_t *n, *prev, **tail;
+ sqfs_inode_generic_t *inode;
+ sqfs_dir_entry_t *ent;
+ int err;
+
+ tail = &root->children;
+
+ for (;;) {
+ err = sqfs_dir_reader_read(dr, &ent);
+ if (err > 0)
+ break;
+ if (err < 0)
+ return err;
+
+ if (should_skip(ent->type, flags)) {
+ free(ent);
+ continue;
+ }
+
+ err = sqfs_dir_reader_get_inode(dr, &inode);
+ if (err) {
+ free(ent);
+ return err;
+ }
+
+ n = create_node(inode, (const char *)ent->name);
+ free(ent);
+
+ if (n == NULL) {
+ free(inode);
+ return SQFS_ERROR_ALLOC;
+ }
+
+ if (would_be_own_parent(root, n)) {
+ free(n);
+ free(inode);
+ return SQFS_ERROR_LINK_LOOP;
+ }
+
+ *tail = n;
+ tail = &n->next;
+ n->parent = root;
+ }
+
+ n = root->children;
+ prev = NULL;
+
+ while (n != NULL) {
+ if (n->inode->base.type == SQFS_INODE_DIR ||
+ n->inode->base.type == SQFS_INODE_EXT_DIR) {
+ if (!(flags & SQFS_TREE_NO_RECURSE)) {
+ err = sqfs_dir_reader_open_dir(dr, n->inode);
+ if (err)
+ return err;
+
+ err = fill_dir(dr, n, flags);
+ if (err)
+ return err;
+ }
+
+ if (n->children == NULL &&
+ (flags & SQFS_TREE_NO_EMPTY)) {
+ free(n->inode);
+ if (prev == NULL) {
+ root->children = n->next;
+ free(n);
+ n = root->children;
+ } else {
+ prev->next = n->next;
+ free(n);
+ n = prev->next;
+ }
+ continue;
+ }
+ }
+
+ prev = n;
+ n = n->next;
+ }
+
+ return 0;
+}
+
+static int resolve_ids(sqfs_tree_node_t *root, const sqfs_id_table_t *idtbl)
+{
+ sqfs_tree_node_t *it;
+ int err;
+
+ for (it = root->children; it != NULL; it = it->next)
+ resolve_ids(it, idtbl);
+
+ err = sqfs_id_table_index_to_id(idtbl, root->inode->base.uid_idx,
+ &root->uid);
+ if (err)
+ return err;
+
+ return sqfs_id_table_index_to_id(idtbl, root->inode->base.gid_idx,
+ &root->gid);
+}
+
+void sqfs_dir_tree_destroy(sqfs_tree_node_t *root)
+{
+ sqfs_tree_node_t *it;
+
+ while (root->children != NULL) {
+ it = root->children;
+ root->children = it->next;
+
+ sqfs_dir_tree_destroy(it);
+ }
+
+ free(root->inode);
+ free(root);
+}
+
+int sqfs_dir_reader_get_full_hierarchy(sqfs_dir_reader_t *rd,
+ const sqfs_id_table_t *idtbl,
+ const char *path, unsigned int flags,
+ sqfs_tree_node_t **out)
+{
+ sqfs_tree_node_t *root, *tail, *new;
+ sqfs_inode_generic_t *inode;
+ sqfs_dir_entry_t *ent;
+ const char *ptr;
+ int ret;
+
+ ret = sqfs_dir_reader_get_root_inode(rd, &inode);
+ if (ret)
+ return ret;
+
+ root = tail = create_node(inode, "");
+ if (root == NULL) {
+ free(inode);
+ return SQFS_ERROR_ALLOC;
+ }
+ inode = NULL;
+
+ while (path != NULL && *path != '\0') {
+ if (*path == '/' || *path == '\\') {
+ while (*path == '/' || *path == '\\')
+ ++path;
+ continue;
+ }
+
+ ret = sqfs_dir_reader_open_dir(rd, tail->inode);
+ if (ret)
+ goto fail;
+
+ ptr = strchr(path, '/');
+ if (ptr == NULL)
+ ptr = strchrnul(path, '\\');
+
+ for (;;) {
+ ret = sqfs_dir_reader_read(rd, &ent);
+ if (ret < 0)
+ goto fail;
+ if (ret > 0) {
+ ret = SQFS_ERROR_NO_ENTRY;
+ goto fail;
+ }
+
+ ret = strncmp((const char *)ent->name,
+ path, ptr - path);
+ if (ret == 0 && ent->name[ptr - path] == '\0')
+ break;
+ free(ent);
+ }
+
+ ret = sqfs_dir_reader_get_inode(rd, &inode);
+ if (ret) {
+ free(ent);
+ goto fail;
+ }
+
+ new = create_node(inode, (const char *)ent->name);
+ free(ent);
+
+ if (new == NULL) {
+ free(inode);
+ ret = SQFS_ERROR_ALLOC;
+ goto fail;
+ }
+
+ inode = NULL;
+ path = ptr;
+
+ if (flags & SQFS_TREE_STORE_PARENTS) {
+ tail->children = new;
+ new->parent = tail;
+ tail = new;
+ } else {
+ sqfs_dir_tree_destroy(root);
+ root = tail = new;
+ }
+ }
+
+ if (tail->inode->base.type == SQFS_INODE_DIR ||
+ tail->inode->base.type == SQFS_INODE_EXT_DIR) {
+ ret = sqfs_dir_reader_open_dir(rd, tail->inode);
+ if (ret)
+ goto fail;
+
+ ret = fill_dir(rd, tail, flags);
+ if (ret)
+ goto fail;
+ }
+
+ ret = resolve_ids(root, idtbl);
+ if (ret)
+ goto fail;
+
+ *out = root;
+ return 0;
+fail:
+ sqfs_dir_tree_destroy(root);
+ return ret;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-16 15:13:44 +0000