Move directory iterator from libutil to libio

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 218 insertions, 0 deletions

diff --git a/lib/io/src/win32/dir_iterator.c b/lib/io/src/win32/dir_iterator.c
new file mode 100644
index 0000000..23d00f4
--- /dev/null
+++ b/lib/io/src/win32/dir_iterator.c
@@ -0,0 +1,218 @@
+/* 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, dir_entry_t **out)
+{
+	dir_iterator_win32_t *w32 = (dir_iterator_win32_t *)it;
+	dir_entry_t *ent = NULL;
+	DWORD length;
+
+	if (w32->state == 0 && !w32->is_first) {
+		if (!FindNextFileW(w32->dirhnd, &w32->ent)) {
+			if (GetLastError() == ERROR_NO_MORE_FILES) {
+				w32->state = 1;
+			} else {
+				w32->state = SQFS_ERROR_IO;
+			}
+		}
+	}
+
+	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->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 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;
+
+	*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';
+
+	sqfs_object_init(sub, dir_iterator_destroy, NULL);
+	((dir_iterator_t *)sub)->next = dir_iterator_next;
+	((dir_iterator_t *)sub)->read_link = dir_iterator_read_link;
+	((dir_iterator_t *)sub)->open_subdir = dir_iterator_open_subdir;
+	sub->is_first = true;
+	sub->state = 0;
+
+	sub->dirhnd = FindFirstFileW(sub->path, &sub->ent);
+	if (sub->dirhnd == INVALID_HANDLE_VALUE) {
+		free(sub);
+		return SQFS_ERROR_IO;
+	}
+
+	*out = (dir_iterator_t *)sub;
+	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));
+	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;
+	it->is_first = true;
+	it->state = 0;
+
+	/* get the directory handle AND the first entry */
+	it->dirhnd = FindFirstFileW(it->path, &it->ent);
+
+	if (it->dirhnd == INVALID_HANDLE_VALUE) {
+		w32_perror(path);
+		free(it);
+		return NULL;
+	}
+
+	return (dir_iterator_t *)it;
+fail_alloc:
+	fprintf(stderr, "%s: allocation failure.\n", path);
+	free(wpath);
+	return NULL;
+}