aboutsummaryrefslogtreecommitdiff
path: root/lib/sqfs/src/io
diff options
context:
space:
mode:
Diffstat (limited to 'lib/sqfs/src/io')
-rw-r--r--lib/sqfs/src/io/dir_rec.c253
1 files changed, 253 insertions, 0 deletions
diff --git a/lib/sqfs/src/io/dir_rec.c b/lib/sqfs/src/io/dir_rec.c
new file mode 100644
index 0000000..a5d53af
--- /dev/null
+++ b/lib/sqfs/src/io/dir_rec.c
@@ -0,0 +1,253 @@
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/*
+ * dir_rec.c
+ *
+ * Copyright (C) 2023 David Oberhollenzer <goliath@infraroot.at>
+ */
+#define SQFS_BUILDING_DLL
+#include "config.h"
+
+#include "util/util.h"
+#include "sqfs/dir_entry.h"
+#include "sqfs/error.h"
+#include "sqfs/io.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct dir_stack_t {
+ struct dir_stack_t *next;
+ sqfs_dir_iterator_t *dir;
+ char name[];
+} dir_stack_t;
+
+typedef struct {
+ sqfs_dir_iterator_t base;
+
+ int state;
+ dir_stack_t *top;
+
+ dir_stack_t *next_top;
+} dir_tree_iterator_t;
+
+static void pop(dir_tree_iterator_t *it)
+{
+ if (it->top != NULL) {
+ dir_stack_t *ent = it->top;
+ it->top = it->top->next;
+
+ sqfs_drop(ent->dir);
+ free(ent);
+ }
+}
+
+static sqfs_dir_entry_t *expand_path(const dir_tree_iterator_t *it,
+ sqfs_dir_entry_t *ent)
+{
+ size_t slen = strlen(ent->name) + 1, plen = 0;
+ char *dst;
+ void *new;
+
+ for (dir_stack_t *sit = it->top; sit != NULL; sit = sit->next) {
+ if (sit->name[0] != '\0')
+ plen += strlen(sit->name) + 1;
+ }
+
+ if (plen == 0)
+ return ent;
+
+ new = realloc(ent, sizeof(*ent) + plen + slen);
+ if (new == NULL) {
+ free(ent);
+ return NULL;
+ }
+
+ ent = new;
+ memmove(ent->name + plen, ent->name, slen);
+ dst = ent->name + plen;
+
+ for (dir_stack_t *sit = it->top; sit != NULL; sit = sit->next) {
+ size_t len = strlen(sit->name);
+ if (len > 0) {
+ *(--dst) = '/';
+ dst -= len;
+ memcpy(dst, sit->name, len);
+ }
+ }
+
+ return ent;
+}
+
+/*****************************************************************************/
+
+static void destroy(sqfs_object_t *obj)
+{
+ dir_tree_iterator_t *it = (dir_tree_iterator_t *)obj;
+
+ while (it->top != NULL)
+ pop(it);
+
+ if (it->next_top != NULL) {
+ sqfs_drop(it->next_top->dir);
+ free(it->next_top);
+ }
+
+ free(it);
+}
+
+static int next(sqfs_dir_iterator_t *base, sqfs_dir_entry_t **out)
+{
+ dir_tree_iterator_t *it = (dir_tree_iterator_t *)base;
+ sqfs_dir_entry_t *ent = NULL;
+ int ret;
+
+ *out = NULL;
+ if (it->state != 0)
+ return it->state;
+
+ if (it->next_top != NULL) {
+ it->next_top->next = it->top;
+ it->top = it->next_top;
+ it->next_top = NULL;
+ }
+
+ for (;;) {
+ if (it->top == NULL) {
+ ret = 1;
+ goto fail;
+ }
+
+ ret = it->top->dir->next(it->top->dir, &ent);
+ if (ret < 0)
+ goto fail;
+
+ if (ret > 0) {
+ pop(it);
+ continue;
+ }
+
+ if (!strcmp(ent->name, ".") || !strcmp(ent->name, "..")) {
+ free(ent);
+ ent = NULL;
+ continue;
+ }
+
+ break;
+ }
+
+ ent = expand_path(it, ent);
+ if (ent == NULL) {
+ it->state = SQFS_ERROR_ALLOC;
+ return it->state;
+ }
+
+ if (S_ISDIR(ent->mode)) {
+ sqfs_dir_iterator_t *sub = NULL;
+ const char *name = strrchr(ent->name, '/');
+ name = (name == NULL) ? ent->name : (name + 1);
+
+ ret = it->top->dir->open_subdir(it->top->dir, &sub);
+ if (ret != 0)
+ goto fail;
+
+ it->next_top = alloc_flex(sizeof(*(it->next_top)), 1,
+ strlen(name) + 1);
+ if (it->next_top == NULL) {
+ sqfs_drop(sub);
+ goto fail;
+ }
+
+ strcpy(it->next_top->name, name);
+ it->next_top->dir = sub;
+ }
+
+ *out = ent;
+ return it->state;
+fail:
+ free(ent);
+ it->state = ret;
+ return it->state;
+}
+
+static int read_link(sqfs_dir_iterator_t *base, char **out)
+{
+ dir_tree_iterator_t *it = (dir_tree_iterator_t *)base;
+
+ *out = NULL;
+ if (it->top == NULL)
+ return SQFS_ERROR_NO_ENTRY;
+
+ return it->top->dir->read_link(it->top->dir, out);
+}
+
+static int open_subdir(sqfs_dir_iterator_t *base, sqfs_dir_iterator_t **out)
+{
+ dir_tree_iterator_t *it = (dir_tree_iterator_t *)base;
+
+ *out = NULL;
+ if (it->top == NULL)
+ return SQFS_ERROR_NO_ENTRY;
+
+ return it->top->dir->open_subdir(it->top->dir, out);
+}
+
+static void ignore_subdir(sqfs_dir_iterator_t *base)
+{
+ dir_tree_iterator_t *it = (dir_tree_iterator_t *)base;
+
+ if (it->next_top != NULL) {
+ sqfs_drop(it->next_top->dir);
+ free(it->next_top);
+ it->next_top = NULL;
+ }
+}
+
+static int open_file_ro(sqfs_dir_iterator_t *base, sqfs_istream_t **out)
+{
+ dir_tree_iterator_t *it = (dir_tree_iterator_t *)base;
+
+ *out = NULL;
+ if (it->top == NULL)
+ return SQFS_ERROR_NO_ENTRY;
+
+ return it->top->dir->open_file_ro(it->top->dir, out);
+}
+
+static int read_xattr(sqfs_dir_iterator_t *base, sqfs_xattr_t **out)
+{
+ dir_tree_iterator_t *it = (dir_tree_iterator_t *)base;
+
+ *out = NULL;
+ if (it->top == NULL)
+ return SQFS_ERROR_NO_ENTRY;
+
+ return it->top->dir->read_xattr(it->top->dir, out);
+}
+
+int sqfs_dir_iterator_create_recursive(sqfs_dir_iterator_t **out,
+ sqfs_dir_iterator_t *base)
+{
+ dir_tree_iterator_t *it = calloc(1, sizeof(*it));
+
+ *out = NULL;
+ if (it == NULL)
+ return SQFS_ERROR_ALLOC;
+
+ it->next_top = calloc(1, sizeof(*(it->next_top)) + 1);
+ if (it->next_top == NULL) {
+ free(it);
+ return SQFS_ERROR_ALLOC;
+ }
+ it->next_top->dir = sqfs_grab(base);
+
+ sqfs_object_init(it, destroy, NULL);
+ ((sqfs_dir_iterator_t *)it)->next = next;
+ ((sqfs_dir_iterator_t *)it)->read_link = read_link;
+ ((sqfs_dir_iterator_t *)it)->open_subdir = open_subdir;
+ ((sqfs_dir_iterator_t *)it)->ignore_subdir = ignore_subdir;
+ ((sqfs_dir_iterator_t *)it)->open_file_ro = open_file_ro;
+ ((sqfs_dir_iterator_t *)it)->read_xattr = read_xattr;
+
+ *out = (sqfs_dir_iterator_t *)it;
+ return 0;
+}