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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* dir_iterator.c
*
* Copyright (C) 2023 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "io/dir_iterator.h"
#include "util/util.h"
#include "sqfs/error.h"
#include <windows.h>
#include <stdlib.h>
#include <stdio.h>
#define UNIX_EPOCH_ON_W32 11644473600UL
#define W32_TICS_PER_SEC 10000000UL
typedef struct {
dir_iterator_t base;
WIN32_FIND_DATAW ent;
HANDLE dirhnd;
int state;
bool is_first;
WCHAR path[];
} dir_iterator_win32_t;
static sqfs_s64 w32time_to_unix(const FILETIME *ft)
{
sqfs_u64 w32ts;
w32ts = ft->dwHighDateTime;
w32ts <<= 32UL;
w32ts |= ft->dwLowDateTime;
w32ts /= W32_TICS_PER_SEC;
if (w32ts <= UNIX_EPOCH_ON_W32)
return -((sqfs_s64)(UNIX_EPOCH_ON_W32 - w32ts));
return w32ts - UNIX_EPOCH_ON_W32;
}
static int dir_iterator_read_link(dir_iterator_t *it, char **out)
{
(void)it;
*out = NULL;
return SQFS_ERROR_UNSUPPORTED;
}
static int dir_iterator_next(dir_iterator_t *it, sqfs_dir_entry_t **out)
{
dir_iterator_win32_t *w32 = (dir_iterator_win32_t *)it;
sqfs_dir_entry_t *ent = NULL;
DWORD length;
if (w32->state == 0 && !w32->is_first) {
if (!FindNextFileW(w32->dirhnd, &w32->ent)) {
os_error_t err = get_os_error_state();
if (err.w32_errno == ERROR_NO_MORE_FILES) {
w32->state = 1;
} else {
w32->state = SQFS_ERROR_IO;
}
set_os_error_state(err);
}
}
w32->is_first = false;
if (w32->state != 0)
goto out;
length = WideCharToMultiByte(CP_UTF8, 0, w32->ent.cFileName,
-1, NULL, 0, NULL, NULL);
if (length <= 0) {
w32->state = SQFS_ERROR_ALLOC;
goto out;
}
ent = alloc_flex(sizeof(*ent), 1, length + 1);
if (ent == NULL) {
w32->state = SQFS_ERROR_ALLOC;
goto out;
}
WideCharToMultiByte(CP_UTF8, 0, w32->ent.cFileName, -1,
ent->name, length + 1, NULL, NULL);
if (w32->ent.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
ent->mode = S_IFDIR | 0755;
} else {
ent->mode = S_IFREG | 0644;
ent->size = w32->ent.nFileSizeHigh;
ent->size <<= 32UL;
ent->size |= w32->ent.nFileSizeLow;
}
ent->mtime = w32time_to_unix(&(w32->ent.ftLastWriteTime));
out:
*out = ent;
return w32->state;
}
static void dir_iterator_destroy(sqfs_object_t *obj)
{
dir_iterator_win32_t *dir = (dir_iterator_win32_t *)obj;
FindClose(dir->dirhnd);
free(dir);
}
static void dir_iterator_ignore_subdir(dir_iterator_t *it)
{
(void)it;
}
static int dir_iterator_open_file_ro(dir_iterator_t *it, sqfs_istream_t **out)
{
(void)it;
*out = NULL;
return SQFS_ERROR_UNSUPPORTED;
}
static int dir_iterator_read_xattr(dir_iterator_t *it, sqfs_xattr_t **out)
{
(void)it;
*out = NULL;
return 0;
}
static int dir_iterator_init(dir_iterator_win32_t *it);
static int dir_iterator_open_subdir(dir_iterator_t *it, dir_iterator_t **out)
{
const dir_iterator_win32_t *dir = (const dir_iterator_win32_t *)it;
dir_iterator_win32_t *sub = NULL;
size_t plen, slen, total;
int ret;
*out = NULL;
if (dir->state != 0)
return (dir->state > 0) ? SQFS_ERROR_NO_ENTRY : dir->state;
if (!(dir->ent.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
return SQFS_ERROR_NOT_DIR;
plen = wcslen(dir->path) - 1;
slen = wcslen(dir->ent.cFileName);
total = plen + slen + 3;
sub = alloc_flex(sizeof(*sub), sizeof(WCHAR), total);
if (sub == NULL)
return SQFS_ERROR_ALLOC;
memcpy(sub->path, dir->path, plen * sizeof(WCHAR));
memcpy(sub->path + plen, dir->ent.cFileName, slen * sizeof(WCHAR));
sub->path[plen + slen ] = '\\';
sub->path[plen + slen + 1] = '*';
sub->path[plen + slen + 2] = '\0';
ret = dir_iterator_init(sub);
if (ret != 0) {
free(sub);
sub = NULL;
}
*out = (dir_iterator_t *)sub;
return ret;
}
static int dir_iterator_init(dir_iterator_win32_t *it)
{
sqfs_object_init(it, dir_iterator_destroy, NULL);
((dir_iterator_t *)it)->next = dir_iterator_next;
((dir_iterator_t *)it)->read_link = dir_iterator_read_link;
((dir_iterator_t *)it)->open_subdir = dir_iterator_open_subdir;
((dir_iterator_t *)it)->ignore_subdir = dir_iterator_ignore_subdir;
((dir_iterator_t *)it)->open_file_ro = dir_iterator_open_file_ro;
((dir_iterator_t *)it)->read_xattr = dir_iterator_read_xattr;
it->is_first = true;
it->state = 0;
it->dirhnd = FindFirstFileW(it->path, &it->ent);
if (it->dirhnd == INVALID_HANDLE_VALUE)
return SQFS_ERROR_IO;
return 0;
}
dir_iterator_t *dir_iterator_create(const char *path)
{
dir_iterator_win32_t *it;
size_t len, newlen;
WCHAR *wpath = NULL;
void *new = NULL;
/* convert path to UTF-16, append "\\*" */
wpath = path_to_windows(path);
if (wpath == NULL)
goto fail_alloc;
len = wcslen(wpath);
newlen = len + 1;
if (len > 0 && wpath[len - 1] != '\\')
newlen += 1;
new = realloc(wpath, sizeof(wpath[0]) * (newlen + 1));
if (new == NULL)
goto fail_alloc;
wpath = new;
if (len > 0 && wpath[len - 1] != '\\')
wpath[len++] = '\\';
wpath[len++] = '*';
wpath[len++] = '\0';
/* create the sourrounding iterator structure */
new = realloc(wpath, sizeof(*it) + len * sizeof(wpath[0]));
if (new == NULL)
goto fail_alloc;
it = new;
wpath = NULL;
memmove(it->path, new, len * sizeof(wpath[0]));
/* initialize */
memset(it, 0, offsetof(dir_iterator_win32_t, path));
if (dir_iterator_init(it) != 0) {
w32_perror(path);
free(it);
it = NULL;
}
return (dir_iterator_t *)it;
fail_alloc:
fprintf(stderr, "%s: allocation failure.\n", path);
free(wpath);
return NULL;
}
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