Merge pull request #915 from rsn8887/vita

PSP2: Add Playstation Vita support

1 files changed, 241 insertions, 0 deletions

diff --git a/backends/fs/psp2/psp2-dirent.cpp b/backends/fs/psp2/psp2-dirent.cpp
new file mode 100644
index 0000000000..aefd1a067d
--- /dev/null
+++ b/backends/fs/psp2/psp2-dirent.cpp
@@ -0,0 +1,241 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+/*
+
+Copyright (C) 2016, David "Davee" Morgan
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+
+*/
+
+#include "psp2-dirent.h"
+#include <errno.h>
+#include <malloc.h>
+#include <string.h>
+
+#include <psp2/types.h>
+#include <psp2/io/dirent.h>
+#include <psp2/kernel/threadmgr.h>
+
+#define SCE_ERRNO_MASK 0xFF
+
+
+struct DIR_ {
+	SceUID uid;
+	struct dirent dir;
+	int refcount;
+	char *dirname;
+	int index;
+};
+
+static inline void grab_dir(DIR *dirp) {
+	__sync_add_and_fetch(&dirp->refcount, 1);
+}
+
+static inline void drop_dir(DIR *dirp) {
+	if (__sync_add_and_fetch(&dirp->refcount, 1) == 0) {
+		free(dirp->dirname);
+		free(dirp);
+	}
+}
+
+static inline void release_drop_dir(DIR *dirp) {
+	if (__sync_add_and_fetch(&dirp->refcount, 2) == 0) {
+		free(dirp->dirname);
+		free(dirp);
+	}
+}
+
+static inline void atomic_exchange(int *obj, int desired) {
+	__sync_synchronize();
+	__sync_lock_test_and_set(obj, desired);
+}
+
+#ifdef F_closedir
+int	closedir(DIR *dirp) {
+	if (!dirp) {
+		errno = EBADF;
+		return -1;
+	}
+
+	grab_dir(dirp);
+
+	int res = sceIoDclose(dirp->uid);
+
+	if (res < 0) {
+		errno = res & SCE_ERRNO_MASK;
+		drop_dir(dirp);
+		return -1;
+	}
+
+	release_drop_dir(dirp);
+
+	errno = 0;
+	return 0;
+}
+#endif
+
+#if F_opendir
+DIR *opendir(const char *dirname) {
+	SceUID uid = sceIoDopen(dirname);
+
+	if (uid < 0) {
+		errno = uid & SCE_ERRNO_MASK;
+		return NULL;
+	}
+
+	DIR *dirp = (DIR *)calloc(1, sizeof(DIR));
+
+	if (!dirp) {
+		sceIoDclose(uid);
+		errno = ENOMEM;
+		return NULL;
+	}
+
+	dirp->refcount = 1;
+	dirp->uid = uid;
+	dirp->dirname = strdup(dirname);
+	dirp->index = 0;
+
+	errno = 0;
+	return dirp;
+}
+#endif
+
+#ifdef F_readdir
+struct dirent *readdir(DIR *dirp) {
+	if (!dirp) {
+		errno = EBADF;
+		return NULL;
+	}
+
+	grab_dir(dirp);
+
+	int res = sceIoDread(dirp->uid, (SceIoDirent *)&dirp->dir);
+
+	if (res < 0) {
+		errno = res & SCE_ERRNO_MASK;
+		drop_dir(dirp);
+		return NULL;
+	}
+
+	if (res == 0) {
+		errno = 0;
+		drop_dir(dirp);
+		return NULL;
+	}
+
+	__sync_add_and_fetch(&dirp->index, 1);
+
+	struct dirent *dir = &dirp->dir;
+	drop_dir(dirp);
+	return dir;
+}
+#endif
+#ifdef F_readdir_r
+int	readdir_r(DIR *dirp, struct dirent *x, struct dirent **y) {
+	errno = ENOSYS;
+	return -1;
+}
+#endif
+
+#ifdef F_rewinddir
+void rewinddir(DIR *dirp) {
+	if (!dirp) {
+		errno = EBADF;
+		return;
+	}
+
+	grab_dir(dirp);
+
+	SceUID dirfd = sceIoDopen(dirp->dirname);
+
+	if (dirfd < 0) {
+		errno = dirfd & SCE_ERRNO_MASK;
+		drop_dir(dirp);
+		return;
+	}
+
+	sceIoDclose(dirp->uid);
+	atomic_exchange(&dirp->uid, dirfd);
+	atomic_exchange(&dirp->index, 0);
+
+	drop_dir(dirp);
+}
+#endif
+
+#ifdef F_seekdir
+void seekdir(DIR *dirp, long int index) {
+	if (!dirp) {
+		errno = EBADF;
+		return;
+	}
+
+	grab_dir(dirp);
+
+	if (index < dirp->index)
+		rewinddir(dirp);
+
+	if (index < dirp->index) {
+		drop_dir(dirp);
+		return;
+	}
+
+	while (index != dirp->index) {
+		if (!readdir(dirp)) {
+			errno = ENOENT;
+			drop_dir(dirp);
+			return;
+		}
+	}
+
+	drop_dir(dirp);
+}
+#endif
+
+#ifdef F_telldir
+long int telldir(DIR *dirp) {
+	if (!dirp) {
+		errno = EBADF;
+		return -1;
+	}
+
+	return dirp->index;
+}
+#endif