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/* 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;
}
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