fuse: introduction of fsp_fuse_env and major refactoring

inc/fuse/winfsp_fuse.h

@@ -0,0 +1,162 @@
+/**
+ * @file fuse/winfsp_fuse.h
+ * WinFsp FUSE compatible API.
+ *
+ * @copyright 2015-2016 Bill Zissimopoulos
+ */
+/*
+ * This file is part of WinFsp.
+ *
+ * You can redistribute it and/or modify it under the terms of the
+ * GNU Affero General Public License version 3 as published by the
+ * Free Software Foundation.
+ *
+ * Licensees holding a valid commercial license may use this file in
+ * accordance with the commercial license agreement provided with the
+ * software.
+ */
+
+#ifndef FUSE_WINFSP_FUSE_H_INCLUDED
+#define FUSE_WINFSP_FUSE_H_INCLUDED
+
+#include <stdint.h>
+#if !defined(WINFSP_DLL_INTERNAL)
+#include <stdlib.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if defined(WINFSP_DLL_INTERNAL)
+#define FSP_FUSE_API                    __declspec(dllexport)
+#else
+#define FSP_FUSE_API                    __declspec(dllimport)
+#endif
+
+/*
+ * FUSE uses a number of types (notably: struct stat) that are OS specific.
+ * Furthermore there are sometimes multiple definitions of the same type even
+ * within the same OS. This is certainly true on Windows, where these types
+ * are not even native.
+ *
+ * For this reason we will define our own fuse_* types which represent the
+ * types as the WinFsp DLL expects to see them. When the file is included
+ * by FUSE clients in different environments we will translate between their
+ * understanding of the types and ours.
+ */
+
+#if defined(_MSC_VER)
+
+typedef uint32_t fuse_uid_t;
+typedef uint32_t fuse_gid_t;
+typedef int32_t fuse_pid_t;
+
+typedef uint64_t fuse_dev_t;
+typedef uint64_t fuse_ino_t;
+typedef uint32_t fuse_mode_t;
+typedef uint32_t fuse_nlink_t;
+typedef int64_t fuse_off_t;
+
+typedef uint64_t fuse_fsblkcnt_t;
+typedef uint64_t fuse_fsfilcnt_t;
+typedef int32_t fuse_blksize_t;
+typedef int32_t fuse_blkcnt_t;
+
+struct fuse_timespec
+{
+    time_t tv_sec;
+    int tv_nsec;
+};
+
+struct fuse_stat
+{
+    fuse_dev_t st_dev;
+    fuse_ino_t st_ino;
+    fuse_mode_t st_mode;
+    fuse_nlink_t st_nlink;
+    fuse_uid_t st_uid;
+    fuse_gid_t st_gid;
+    fuse_dev_t st_rdev;
+    fuse_off_t st_size;
+    struct fuse_timespec st_atim;
+    struct fuse_timespec st_mtim;
+    struct fuse_timespec st_ctim;
+    fuse_blksize_t st_blksize;
+    fuse_blkcnt_t st_blocks;
+    struct fuse_timespec st_birthtim;
+};
+
+struct fuse_statvfs
+{
+    unsigned int f_bsize;
+    unsigned int f_frsize;
+    fuse_fsblkcnt_t f_blocks;
+    fuse_fsblkcnt_t f_bfree;
+    fuse_fsblkcnt_t f_bavail;
+    fuse_fsfilcnt_t f_files;
+    fuse_fsfilcnt_t f_ffree;
+    fuse_fsfilcnt_t f_favail;
+    unsigned int f_fsid;
+    unsigned int f_flag;
+    unsigned int f_namemax;
+};
+
+#if defined(WINFSP_DLL_INTERNAL)
+#define FSP_FUSE_ENV_INIT               { 'W', MemAlloc, MemFree }
+#else
+#define FSP_FUSE_ENV_INIT               { 'W', malloc, free }
+#endif
+
+#elif defined(__CYGWIN__)
+
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/statvfs.h>
+#include <sys/types.h>
+#include <utime.h>
+
+#define fuse_uid_t                      uid_t
+#define fuse_gid_t                      gid_t
+#define fuse_pid_t                      pid_t
+
+#define fuse_dev_t                      dev_t
+#define fuse_ino_t                      ino_t
+#define fuse_mode_t                     mode_t
+#define fuse_nlink_t                    nlink_t
+#define fuse_off_t                      off_t
+
+#define fuse_fsblkcnt_t                 fsblkcnt_t
+#define fuse_fsfilcnt_t                 fsfilcnt_t
+#define fuse_blksize_t                  blksize_t
+#define fuse_blkcnt_t                   blkcnt_t
+
+#define fuse_timespec                   timespec
+
+#define fuse_stat                       stat
+#define fuse_statvfs                    statvfs
+
+#define FSP_FUSE_ENV_INIT               { 'C', malloc, free }
+
+#else
+#error unsupported environment
+#endif
+
+struct fsp_fuse_env
+{
+    unsigned environment;
+    void *(*memalloc)(size_t);
+    void (*memfree)(void *);
+};
+
+static inline struct fsp_fuse_env *fsp_fuse_env(void)
+{
+    static struct fsp_fuse_env env = FSP_FUSE_ENV_INIT;
+    return &env;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif