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-rw-r--r--bin/gensquashfs/fstree_from_dir.c493
1 files changed, 493 insertions, 0 deletions
diff --git a/bin/gensquashfs/fstree_from_dir.c b/bin/gensquashfs/fstree_from_dir.c
new file mode 100644
index 0000000..5b3f003
--- /dev/null
+++ b/bin/gensquashfs/fstree_from_dir.c
@@ -0,0 +1,493 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * fstree_from_dir.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+#include "mkfs.h"
+
+#include <dirent.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#if defined(_WIN32) || defined(__WINDOWS__)
+#define UNIX_EPOCH_ON_W32 11644473600UL
+#define W32_TICS_PER_SEC 10000000UL
+
+static sqfs_u32 w32time_to_sqfs_time(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 0;
+
+ w32ts -= UNIX_EPOCH_ON_W32;
+
+ return (w32ts < 0x0FFFFFFFFUL) ? w32ts : 0xFFFFFFFF;
+}
+
+static int add_node(fstree_t *fs, tree_node_t *root,
+ scan_node_callback cb, void *user,
+ unsigned int flags,
+ const LPWIN32_FIND_DATAW entry)
+{
+ tree_node_t *n;
+ DWORD length;
+
+ if (entry->cFileName[0] == '.') {
+ if (entry->cFileName[1] == '\0')
+ return 0;
+
+ if (entry->cFileName[1] == '.' && entry->cFileName[2] == '\0')
+ return 0;
+ }
+
+ length = WideCharToMultiByte(CP_UTF8, 0, entry->cFileName,
+ -1, NULL, 0, NULL, NULL);
+ if (length <= 0) {
+ w32_perror("converting path to UTF-8");
+ return -1;
+ }
+
+ n = calloc(1, sizeof(*n) + length + 1);
+ if (n == NULL) {
+ fprintf(stderr, "creating tree node: out-of-memory\n");
+ return -1;
+ }
+
+ n->name = (char *)n->payload;
+ WideCharToMultiByte(CP_UTF8, 0, entry->cFileName, -1,
+ n->name, length + 1, NULL, NULL);
+
+ if (entry->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
+ if (flags & DIR_SCAN_NO_DIR) {
+ free(n);
+ return 0;
+ }
+
+ n->mode = S_IFDIR | 0755;
+ } else {
+ if (flags & DIR_SCAN_NO_FILE) {
+ free(n);
+ return 0;
+ }
+
+ n->mode = S_IFREG | 0644;
+ }
+
+ if (cb != NULL) {
+ int ret = cb(user, fs, n);
+
+ if (ret != 0) {
+ free(n);
+ return ret < 0 ? ret : 0;
+ }
+ }
+
+ if (flags & DIR_SCAN_KEEP_TIME) {
+ n->mod_time = w32time_to_sqfs_time(&(entry->ftLastWriteTime));
+ } else {
+ n->mod_time = fs->defaults.st_mtime;
+ }
+
+ fstree_insert_sorted(root, n);
+ return 0;
+}
+
+static int scan_dir(fstree_t *fs, tree_node_t *root,
+ const char *path, const WCHAR *wpath,
+ scan_node_callback cb, void *user,
+ unsigned int flags)
+{
+ WIN32_FIND_DATAW entry;
+ HANDLE dirhnd;
+
+ dirhnd = FindFirstFileW(wpath, &entry);
+
+ if (dirhnd == INVALID_HANDLE_VALUE)
+ goto fail_perror;
+
+ do {
+ if (add_node(fs, root, cb, user, flags, &entry))
+ goto fail;
+ } while (FindNextFileW(dirhnd, &entry));
+
+ if (GetLastError() != ERROR_NO_MORE_FILES)
+ goto fail_perror;
+
+ FindClose(dirhnd);
+ return 0;
+fail_perror:
+ w32_perror(path);
+fail:
+ if (dirhnd != INVALID_HANDLE_VALUE)
+ FindClose(dirhnd);
+ return -1;
+}
+
+int fstree_from_dir(fstree_t *fs, tree_node_t *root,
+ const char *path, scan_node_callback cb,
+ void *user, unsigned int flags)
+{
+ WCHAR *wpath = NULL, *new = NULL;
+ size_t len, newlen;
+ tree_node_t *n;
+
+ /* path -> to_wchar(path) + L"\*" */
+ wpath = path_to_windows(path);
+ if (wpath == NULL) {
+ fprintf(stderr, "%s: allocation failure.\n", path);
+ return -1;
+ }
+
+ 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);
+ goto fail;
+ }
+
+ wpath = new;
+
+ if (len > 0 && wpath[len - 1] != '\\')
+ wpath[len++] = '\\';
+
+ wpath[len++] = '*';
+ wpath[len++] = '\0';
+
+ /* scan directory contents */
+ if (scan_dir(fs, root, path, wpath, cb, user, flags))
+ goto fail;
+
+ free(wpath);
+ wpath = NULL;
+
+ /* recursion step */
+ if (flags & DIR_SCAN_NO_RECURSION)
+ return 0;
+
+ for (n = root->data.dir.children; n != NULL; n = n->next) {
+ if (!S_ISDIR(n->mode))
+ continue;
+
+ if (fstree_from_subdir(fs, n, path, n->name, cb, user, flags))
+ return -1;
+ }
+
+ return 0;
+fail:
+ free(wpath);
+ return -1;
+}
+
+int fstree_from_subdir(fstree_t *fs, tree_node_t *root,
+ const char *path, const char *subdir,
+ scan_node_callback cb, void *user,
+ unsigned int flags)
+{
+ size_t len, plen, slen;
+ WCHAR *wpath = NULL;
+ char *temp = NULL;
+ tree_node_t *n;
+
+ plen = strlen(path);
+ slen = subdir == NULL ? 0 : strlen(subdir);
+
+ if (slen == 0)
+ return fstree_from_dir(fs, root, path, cb, user, flags);
+
+ len = plen + 1 + slen + 2;
+
+ temp = calloc(1, len + 1);
+ if (temp == NULL) {
+ fprintf(stderr, "%s/%s: allocation failure.\n", path, subdir);
+ return -1;
+ }
+
+ memcpy(temp, path, plen);
+ temp[plen] = '/';
+ memcpy(temp + plen + 1, subdir, slen);
+ temp[plen + 1 + slen ] = '/';
+ temp[plen + 1 + slen + 1] = '*';
+ temp[plen + 1 + slen + 2] = '\0';
+
+ wpath = path_to_windows(temp);
+ if (wpath == NULL) {
+ fprintf(stderr, "%s: allocation failure.\n", temp);
+ goto fail;
+ }
+
+ if (scan_dir(fs, root, temp, wpath, cb, user, flags))
+ goto fail;
+
+ free(wpath);
+ wpath = NULL;
+
+ if (flags & DIR_SCAN_NO_RECURSION) {
+ free(temp);
+ return 0;
+ }
+
+ temp[plen + 1 + slen] = '\0';
+
+ for (n = root->data.dir.children; n != NULL; n = n->next) {
+ if (!S_ISDIR(n->mode))
+ continue;
+
+ if (fstree_from_subdir(fs, n, temp, n->name, cb, user, flags))
+ goto fail;
+ }
+
+ free(temp);
+ return 0;
+fail:
+ free(temp);
+ free(wpath);
+ return -1;
+
+}
+#else
+static void discard_node(tree_node_t *root, tree_node_t *n)
+{
+ tree_node_t *it;
+
+ if (n == root->data.dir.children) {
+ root->data.dir.children = n->next;
+ } else {
+ it = root->data.dir.children;
+
+ while (it != NULL && it->next != n)
+ it = it->next;
+
+ if (it != NULL)
+ it->next = n->next;
+ }
+
+ free(n);
+}
+
+static int populate_dir(int dir_fd, fstree_t *fs, tree_node_t *root,
+ dev_t devstart, scan_node_callback cb,
+ void *user, unsigned int flags)
+{
+ char *extra = NULL;
+ struct dirent *ent;
+ int ret, childfd;
+ struct stat sb;
+ tree_node_t *n;
+ DIR *dir;
+
+ dir = fdopendir(dir_fd);
+ if (dir == NULL) {
+ perror("fdopendir");
+ close(dir_fd);
+ return -1;
+ }
+
+ /* XXX: fdopendir can dup and close dir_fd internally
+ and still be compliant with the spec. */
+ dir_fd = dirfd(dir);
+
+ for (;;) {
+ errno = 0;
+ ent = readdir(dir);
+
+ if (ent == NULL) {
+ if (errno) {
+ perror("readdir");
+ goto fail;
+ }
+ break;
+ }
+
+ if (!strcmp(ent->d_name, "..") || !strcmp(ent->d_name, "."))
+ continue;
+
+ if (fstatat(dir_fd, ent->d_name, &sb, AT_SYMLINK_NOFOLLOW)) {
+ perror(ent->d_name);
+ goto fail;
+ }
+
+ switch (sb.st_mode & S_IFMT) {
+ case S_IFSOCK:
+ if (flags & DIR_SCAN_NO_SOCK)
+ continue;
+ break;
+ case S_IFLNK:
+ if (flags & DIR_SCAN_NO_SLINK)
+ continue;
+ break;
+ case S_IFREG:
+ if (flags & DIR_SCAN_NO_FILE)
+ continue;
+ break;
+ case S_IFBLK:
+ if (flags & DIR_SCAN_NO_BLK)
+ continue;
+ break;
+ case S_IFCHR:
+ if (flags & DIR_SCAN_NO_CHR)
+ continue;
+ break;
+ case S_IFIFO:
+ if (flags & DIR_SCAN_NO_FIFO)
+ continue;
+ break;
+ default:
+ break;
+ }
+
+ if ((flags & DIR_SCAN_ONE_FILESYSTEM) && sb.st_dev != devstart)
+ continue;
+
+ if (S_ISLNK(sb.st_mode)) {
+ size_t size;
+
+ if ((sizeof(sb.st_size) > sizeof(size_t)) &&
+ sb.st_size > SIZE_MAX) {
+ errno = EOVERFLOW;
+ goto fail_rdlink;
+ }
+
+ if (SZ_ADD_OV((size_t)sb.st_size, 1, &size)) {
+ errno = EOVERFLOW;
+ goto fail_rdlink;
+ }
+
+ extra = calloc(1, size);
+ if (extra == NULL)
+ goto fail_rdlink;
+
+ if (readlinkat(dir_fd, ent->d_name,
+ extra, (size_t)sb.st_size) < 0) {
+ goto fail_rdlink;
+ }
+
+ extra[sb.st_size] = '\0';
+ }
+
+ if (!(flags & DIR_SCAN_KEEP_TIME))
+ sb.st_mtime = fs->defaults.st_mtime;
+
+ if (S_ISDIR(sb.st_mode) && (flags & DIR_SCAN_NO_DIR)) {
+ n = fstree_get_node_by_path(fs, root, ent->d_name,
+ false, false);
+ if (n == NULL)
+ continue;
+
+ ret = 0;
+ } else {
+ n = fstree_mknode(root, ent->d_name,
+ strlen(ent->d_name), extra, &sb);
+ if (n == NULL) {
+ perror("creating tree node");
+ goto fail;
+ }
+
+ ret = (cb == NULL) ? 0 : cb(user, fs, n);
+ }
+
+ free(extra);
+ extra = NULL;
+
+ if (ret < 0)
+ goto fail;
+
+ if (ret > 0) {
+ discard_node(root, n);
+ continue;
+ }
+
+ if (S_ISDIR(n->mode) && !(flags & DIR_SCAN_NO_RECURSION)) {
+ childfd = openat(dir_fd, n->name, O_DIRECTORY |
+ O_RDONLY | O_CLOEXEC);
+ if (childfd < 0) {
+ perror(n->name);
+ goto fail;
+ }
+
+ if (populate_dir(childfd, fs, n, devstart,
+ cb, user, flags)) {
+ goto fail;
+ }
+ }
+ }
+
+ closedir(dir);
+ return 0;
+fail_rdlink:
+ perror("readlink");
+fail:
+ closedir(dir);
+ free(extra);
+ return -1;
+}
+
+int fstree_from_subdir(fstree_t *fs, tree_node_t *root,
+ const char *path, const char *subdir,
+ scan_node_callback cb, void *user,
+ unsigned int flags)
+{
+ struct stat sb;
+ int fd, subfd;
+
+ if (!S_ISDIR(root->mode)) {
+ fprintf(stderr,
+ "scanning %s/%s into %s: target is not a directory\n",
+ path, subdir == NULL ? "" : subdir, root->name);
+ return -1;
+ }
+
+ fd = open(path, O_DIRECTORY | O_RDONLY | O_CLOEXEC);
+ if (fd < 0) {
+ perror(path);
+ return -1;
+ }
+
+ if (subdir != NULL) {
+ subfd = openat(fd, subdir, O_DIRECTORY | O_RDONLY | O_CLOEXEC);
+
+ if (subfd < 0) {
+ fprintf(stderr, "%s/%s: %s\n", path, subdir,
+ strerror(errno));
+ close(fd);
+ return -1;
+ }
+
+ close(fd);
+ fd = subfd;
+ }
+
+ if (fstat(fd, &sb)) {
+ fprintf(stderr, "%s/%s: %s\n", path,
+ subdir == NULL ? "" : subdir,
+ strerror(errno));
+ close(fd);
+ return -1;
+ }
+
+ return populate_dir(fd, fs, root, sb.st_dev, cb, user, flags);
+}
+
+int fstree_from_dir(fstree_t *fs, tree_node_t *root,
+ const char *path, scan_node_callback cb,
+ void *user, unsigned int flags)
+{
+ return fstree_from_subdir(fs, root, path, NULL, cb, user, flags);
+}
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-15 22:56:38 +0000