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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* w32_dir_iterator.c
*
* Copyright (C) 2023 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "util/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
enum {
STATE_HAVE_ENTRY = 0,
STATE_NEED_ENTRY = 1,
STATE_ERROR = 2,
STATE_EOF = 3,
};
typedef struct {
dir_iterator_t base;
WIN32_FIND_DATAW ent;
HANDLE dirhnd;
int state;
} 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, dir_entry_t **out)
{
dir_iterator_win32_t *w32 = (dir_iterator_win32_t *)it;
dir_entry_t *ent = NULL;
DWORD length;
*out = NULL;
switch (w32->state) {
case STATE_HAVE_ENTRY:
break;
case STATE_NEED_ENTRY:
if (!FindNextFileW(w32->dirhnd, &w32->ent)) {
if (GetLastError() == ERROR_NO_MORE_FILES) {
w32->state = STATE_EOF;
return 1;
}
w32->state = STATE_ERROR;
return SQFS_ERROR_INTERNAL;
}
w32->state = STATE_HAVE_ENTRY;
break;
case STATE_EOF:
return 1;
default:
return SQFS_ERROR_INTERNAL;
}
/* allocate */
length = WideCharToMultiByte(CP_UTF8, 0, w32->ent.cFileName,
-1, NULL, 0, NULL, NULL);
if (length <= 0) {
w32->state = STATE_ERROR;
return SQFS_ERROR_ALLOC;
}
ent = alloc_flex(sizeof(*ent), 1, length + 1);
if (ent == NULL) {
w32->state = STATE_ERROR;
return SQFS_ERROR_ALLOC;
}
/* convert and fill entry fields */
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->mtime = w32time_to_unix(&(w32->ent.ftLastWriteTime));
/* return and update state */
*out = ent;
w32->state = STATE_NEED_ENTRY;
return 0;
}
static void dir_iterator_destroy(sqfs_object_t *obj)
{
dir_iterator_win32_t *dir = (dir_iterator_win32_t *)obj;
FindClose(dir->dirhnd);
free(dir);
}
dir_iterator_t *dir_iterator_create(const char *path)
{
WCHAR *wpath = NULL, *new = NULL;
WIN32_FIND_DATAW first_entry;
dir_iterator_win32_t *it;
size_t len, newlen;
HANDLE dirhnd;
/* convert path to UTF-16, append "\\*" */
wpath = path_to_windows(path);
if (wpath == NULL) {
fprintf(stderr, "%s: allocation failure.\n", path);
return NULL;
}
for (len = 0; wpath[len] != '\0'; ++len)
;
newlen = len + 1;
if (len > 0 && wpath[len - 1] != '\\')
newlen += 1;
new = realloc(wpath, sizeof(wpath[0]) * (newlen + 1));
if (new == NULL) {
fprintf(stderr, "%s: allocation failure.\n", path);
free(wpath);
return NULL;
}
wpath = new;
if (len > 0 && wpath[len - 1] != '\\')
wpath[len++] = '\\';
wpath[len++] = '*';
wpath[len++] = '\0';
/* get the directory handle AND the first entry */
dirhnd = FindFirstFileW(wpath, &first_entry);
if (dirhnd == INVALID_HANDLE_VALUE) {
w32_perror(path);
free(wpath);
return NULL;
}
free(wpath);
wpath = NULL;
/* wrap it up */
it = calloc(1, sizeof(*it));
if (it == NULL) {
fprintf(stderr, "%s: allocation failure.\n", path);
FindClose(dirhnd);
return NULL;
}
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;
it->state = STATE_HAVE_ENTRY;
it->dirhnd = dirhnd;
it->ent = first_entry;
return (dir_iterator_t *)it;
}
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