chore: add Makefile, headers, and source stubs for fusedav WebDAV FUSE3 client

include/cache.h

@@ -0,0 +1,55 @@
+/* retoor <retoor@molodetz.nl> */
+
+#ifndef FUSEDAV_CACHE_H
+#define FUSEDAV_CACHE_H
+
+#include <pthread.h>
+#include <stdint.h>
+#include <sys/stat.h>
+#include <time.h>
+
+typedef struct cache_entry {
+    char *key;
+    void *value;
+    size_t value_size;
+    time_t created_at;
+    int ttl_ms;
+    struct cache_entry *next;
+} cache_entry_t;
+
+typedef struct {
+    cache_entry_t *head;
+    int max_entries;
+    int current_entries;
+    int default_ttl_ms;
+    pthread_mutex_t lock;
+} cache_t;
+
+typedef struct {
+    char *name;
+    int is_directory;
+    off_t size;
+    time_t mtime;
+} dir_entry_t;
+
+typedef struct {
+    dir_entry_t *entries;
+    int count;
+} dir_listing_t;
+
+cache_t *cache_init(int max_entries, int default_ttl_ms);
+void cache_destroy(cache_t *cache);
+
+int cache_get_stat(cache_t *cache, const char *key, struct stat *st);
+int cache_put_stat(cache_t *cache, const char *key, const struct stat *st);
+
+int cache_get_dir(cache_t *cache, const char *key, dir_listing_t **listing);
+int cache_put_dir(cache_t *cache, const char *key, const dir_listing_t *listing);
+
+void cache_invalidate(cache_t *cache, const char *key);
+void cache_invalidate_prefix(cache_t *cache, const char *prefix);
+void cache_clear(cache_t *cache);
+
+void dir_listing_free(dir_listing_t *listing);
+
+#endif

include/config.h

@@ -0,0 +1,28 @@
+/* retoor <retoor@molodetz.nl> */
+
+#ifndef FUSEDAV_CONFIG_H
+#define FUSEDAV_CONFIG_H
+
+#include <stdint.h>
+
+#define DEFAULT_CACHE_TTL_MS 30000
+#define DEFAULT_TIMEOUT_SEC 10
+#define DEFAULT_MAX_CACHE_ENTRIES 1024
+#define DEFAULT_WRITE_BUFFER_SIZE (1024 * 1024)
+
+typedef struct {
+    char *webdav_url;
+    char *username;
+    char *password;
+    char *mount_point;
+    int cache_ttl_ms;
+    int request_timeout_sec;
+    int foreground;
+    int debug;
+} config_t;
+
+int config_parse(int argc, char *argv[], config_t *cfg);
+void config_free(config_t *cfg);
+void config_print_usage(const char *program_name);
+
+#endif

include/operations.h

@@ -0,0 +1,15 @@
+/* retoor <retoor@molodetz.nl> */
+
+#ifndef FUSEDAV_OPERATIONS_H
+#define FUSEDAV_OPERATIONS_H
+
+#define FUSE_USE_VERSION 31
+
+#include <fuse3/fuse.h>
+#include "webdav.h"
+
+extern struct fuse_operations fusedav_operations;
+
+void operations_init(webdav_context_t *ctx);
+
+#endif

include/utils.h

@@ -0,0 +1,28 @@
+/* retoor <retoor@molodetz.nl> */
+
+#ifndef FUSEDAV_UTILS_H
+#define FUSEDAV_UTILS_H
+
+#include <stddef.h>
+#include <sys/stat.h>
+#include <libxml/parser.h>
+#include "cache.h"
+
+char *url_encode(const char *str);
+char *url_decode(const char *str);
+char *path_join(const char *base, const char *path);
+char *path_parent(const char *path);
+char *path_basename(const char *path);
+int path_is_root(const char *path);
+
+int http_status_to_errno(long http_code);
+
+int parse_propfind_response(const char *xml_data, size_t xml_len,
+                            struct stat *st, dir_listing_t *listing);
+
+time_t parse_http_date(const char *date_str);
+
+char *xml_get_text(xmlNodePtr node);
+int xml_is_collection(xmlNodePtr node);
+
+#endif

include/webdav.h

@@ -0,0 +1,56 @@
+/* retoor <retoor@molodetz.nl> */
+
+#ifndef FUSEDAV_WEBDAV_H
+#define FUSEDAV_WEBDAV_H
+
+#include <curl/curl.h>
+#include <pthread.h>
+#include <stdint.h>
+#include <sys/stat.h>
+#include "cache.h"
+#include "config.h"
+
+typedef struct {
+    char *webdav_url;
+    char *username;
+    char *password;
+    CURL *curl_handle;
+    cache_t *metadata_cache;
+    cache_t *dir_cache;
+    int cache_ttl_ms;
+    int request_timeout_sec;
+    int debug;
+    pthread_mutex_t lock;
+} webdav_context_t;
+
+typedef struct {
+    char *path;
+    char *etag;
+    off_t file_size;
+    time_t last_modified;
+    uint8_t *write_buffer;
+    size_t write_buffer_pos;
+    size_t write_buffer_size;
+    int dirty;
+} file_handle_t;
+
+int webdav_init(webdav_context_t *ctx, const config_t *cfg);
+void webdav_cleanup(webdav_context_t *ctx);
+
+int webdav_get_stat(webdav_context_t *ctx, const char *path, struct stat *st);
+int webdav_list_directory(webdav_context_t *ctx, const char *path, dir_listing_t *listing);
+ssize_t webdav_read_file(webdav_context_t *ctx, const char *path,
+                         off_t offset, size_t size, uint8_t *buffer);
+ssize_t webdav_write_file(webdav_context_t *ctx, const char *path,
+                          off_t offset, size_t size, const uint8_t *buffer);
+int webdav_create_file(webdav_context_t *ctx, const char *path);
+int webdav_mkdir(webdav_context_t *ctx, const char *path);
+int webdav_delete(webdav_context_t *ctx, const char *path);
+int webdav_rename(webdav_context_t *ctx, const char *old_path, const char *new_path);
+int webdav_truncate(webdav_context_t *ctx, const char *path, off_t size);
+
+file_handle_t *file_handle_create(const char *path);
+void file_handle_destroy(file_handle_t *fh);
+int file_handle_flush(webdav_context_t *ctx, file_handle_t *fh);
+
+#endif