Added file stat.

src/filestore.hpp

@@ -27,6 +27,11 @@ class FileStore {
 
 		typedef uint16_t InodeId_t;
 
+		struct StatInfo {
+			InodeId_t inodeId;
+			FsSize_t  size;
+		};
+
 	private:
 		struct Inode {
 			// the next Inode in memory
@@ -92,6 +97,14 @@ class FileStore {
 		 */
 		int read(InodeId_t id, void *data, FsSize_t *size);
 
+		/**
+		 * Reads the stat information of the inode of the given inode id.
+		 * If the returned inode id is 0, then the requested inode was not found.
+		 * @param id id of the inode to stat
+		 * @return the stat information of the inode of the given inode id
+		 */
+		StatInfo stat(InodeId_t id);
+
 		static uint8_t version();
 
 		static uint8_t *format(uint8_t *buffer, FsSize_t size);
@@ -232,6 +245,19 @@ int FileStore<FsSize_t>::read(InodeId_t id, void *data, FsSize_t *size) {
 	return retval;
 }
 
+template<typename FsSize_t>
+typename FileStore<FsSize_t>::StatInfo FileStore<FsSize_t>::stat(InodeId_t id) {
+	auto inode = getRecord(m_root, id);
+	StatInfo stat;
+	if (inode) {
+		stat.size = inode->dataLen;
+		stat.inodeId = id;
+	} else {
+		stat.inodeId = 0;
+	}
+	return stat;
+}
+
 template<typename FsSize_t>
 typename FileStore<FsSize_t>::FsHeader *FileStore<FsSize_t>::getHeader() {
 	return (FsHeader*) m_begin;

src/filesystem.hpp

@@ -16,13 +16,32 @@
 namespace wombat {
 namespace fs {
 
+struct FileStat {
+	uint64_t inode;
+	uint64_t size;
+};
+
 template<typename FileStore>
 class FileSystem {
 
 	private:
 		FileStore *store = nullptr;
+
+	public:
+		int read(const char *path, void *buffer);
+
+		FileStat stat(const char *path);
 };
 
+template<typename FileStore>
+FileStat FileSystem<FileStore>::stat(const char *path) {
+	FileStat stat;
+	auto s = store->stat(path);
+	stat.size = s.size;
+	stat.inode = s.inodeId;
+	return stat;
+}
+
 typedef FileSystem<FileStore16> FileSystem16;
 typedef FileSystem<FileStore32> FileSystem32;
 typedef FileSystem<FileStore64> FileSystem64;

test/filestoreio.cpp

@@ -31,6 +31,7 @@ int main() {
 		return 1;
 	}
 
+	// make sure first value was not overwritten
 	if (fs.read(1, (char*) out, &outSize) ||
 		 strcmp("Hello", out)) {
 		return 1;