add dir_API to demo direntry API

include/direntry.h

@@ -11,13 +11,13 @@ typedef struct fileNode {
             buffer[j] = t & (((u_int64_t)1<<(8))-1);
             t >>= 8;
         }
-        strcpy(buffer+8, file_name);
+        strcpy(buffer+8, name);
     }
     void deserialize(char* buffer) {
         inode_number = 0;
         for (int j = 0; j < 8; j++)
             inode_number = inode_number | (((u_int64_t)(unsigned char)buffer[j])<<(8*j));
-        strcpy(file_name, buffer+8);
+        strcpy(name, buffer+8);
     }
 } FileNode;
 
@@ -39,3 +39,8 @@ int fischl_add_entry(TreeNode *parent, int new_inode_number, const char *fileNam
 //e.g. FileNode *Dirnode = fischl_find_entry(); can see file inside with Dirnode->subdirectory
 //e.g. go to the current Dirnode parent directory, use TreeNode *get_Dir_parent = Dirnode->subdirectory->parent;
 FileNode *fischl_find_entry(TreeNode *root, const char *path);
+
+void freeTree(TreeNode *node);
+/*for debug use*/
+TreeNode *createDirectory(const char *dirName, TreeNode *parent, int hashSize);
+TreeNode *find_parentPath(TreeNode *root, const char *path);

lib/direntry.cpp

@@ -1,3 +1,10 @@
+#include <stdio.h>
+#include <string>
+#include <assert.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include "fs.h"
+#include "direntry.h"
 /*********************************Hash operation********************************************
 
 ********************************************************************************************/
@@ -36,6 +43,38 @@ FileNode *lookupHash(HashTable *h, char *key) {
     return NULL; // Not found
 }
 
+TreeNode *createDirectory(const char *dirName, TreeNode *parent, int hashSize) {
+    TreeNode *newDir = (TreeNode *)malloc(sizeof(TreeNode));
+    newDir->dirName = strdup(dirName);
+    newDir->contents = createHashTable(hashSize);
+    newDir->parent = parent;
+    if (parent) {
+        newDir->self_info = insertHash(parent->contents, newDir->dirName, newDir);
+    }
+    return newDir;
+}
+
+TreeNode *find_parentPath(TreeNode *root, const char *path) {
+    char *pathCopy = strdup(path);
+    char *segment = strtok(pathCopy, "/");
+    TreeNode *current = root;
+    FileNode *file = NULL;
+
+    while (segment != NULL && current != NULL) {
+        file = lookupHash(current->contents, segment);
+        if (file != NULL && file->subdirectory == NULL) {
+            free(pathCopy); 
+            printf("status current directory %s\n",current->dirName);
+            return current; //File found
+        }
+        current = file ? file->subdirectory : NULL;
+        segment = strtok(NULL, "/");
+    }
+
+    free(pathCopy);
+    return current; // NULL if not found
+}
+
 void freeHashTable(HashTable *table) {
     if (table == NULL) return;
 

test/CMakeLists.txt

@@ -1,6 +1,7 @@
 set(TARGET_LAYER0 test_layer0)
 set(TARGET_LAYER1_API test_layer1_API)
 set(TARGET_LAYER2_API test_layer2_API)
+set(TARGET_DIR_API test_dir_API)
 set(DIR_PLACE /dev/vdb)
 
 # add test sources here ... 
@@ -16,6 +17,10 @@ add_executable(${TARGET_LAYER2_API}
     ../lib/files.cpp
     layer2_API.cpp
 )
+add_executable(${TARGET_DIR_API}
+    ../lib/direntry.cpp
+    dir_API.cpp
+)
 
 # Link Google Test to your test executables
 target_link_libraries(${TARGET_LAYER0} gtest gtest_main)
@@ -24,4 +29,5 @@ target_link_libraries(${TARGET_LAYER1_API} gtest gtest_main)
 # add test to activate ctest -VV
 add_test(NAME ${TARGET_LAYER0} COMMAND sudo ./${TARGET_LAYER0} ${DIR_PLACE})
 add_test(NAME ${TARGET_LAYER1_API} COMMAND sudo ./${TARGET_LAYER1_API} ${DIR_PLACE})
-add_test(NAME ${TARGET_LAYER2_API} COMMAND sudo ./${TARGET_LAYER2_API} ${DIR_PLACE})
+add_test(NAME ${TARGET_LAYER2_API} COMMAND sudo ./${TARGET_LAYER2_API} ${DIR_PLACE})
+add_test(NAME ${TARGET_DIR_API} COMMAND sudo ./${TARGET_DIR_API} ${DIR_PLACE})

test/dir_API.cpp

@@ -0,0 +1,91 @@
+/***********************************************************
+ Directory owns treeNode and FileNode structure, detect S_IFDIR to make treeNode or not (see add_entry Function)
+ File owns FileNode structure only, detect !S_IFDIR 
+
+*/
+#include <stdio.h>
+#include <string>
+#include <assert.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include "fs.h"
+#include "direntry.h"
+
+int main() {
+    TreeNode *root = createDirectory("/", NULL, 20);
+    INode inode_file1;
+    fischl_add_entry(root, 2, "file1",&inode_file1);
+    //I will put this function in create_new_inode function, there will inode number(2) when inode_allocate
+    INode inode_dir1;
+    //permission is necessary there to create treeNode or not
+    u_int64_t ddd_permissions = 0;
+    inode_dir1.permissions = ddd_permissions | S_IFDIR;
+    fischl_add_entry(root, 3, "dir1",&inode_dir1);
+    //find dir file (from root directory view, root contains dir1/ subdirectory)
+    FileNode *get_dir1 = fischl_find_entry(root,"/dir1/");
+    if(get_dir1 == NULL){
+        printf("No dir1 under %s\n",root->dirName);
+        return -1;
+    }else{
+        fprintf(stderr,"[%s ,%d]",__func__,__LINE__);
+        printf(" %s under %s\n",get_dir1->name,root->dirName);
+    }
+    //add file2 under dir1
+    INode inode_file2;
+    if(get_dir1->subdirectory != NULL){
+        //Treenode dir(you cannot find here), you only can get Filenode dir based on fischl_find_entry Function
+        //So use Filenode->subdirectory will point to the treenode dir, then can add files
+        fischl_add_entry(get_dir1->subdirectory, 4, "file2",&inode_file2);
+        printf("add file2 in dir1\n");
+    }
+    /**********************************************************/
+    //This is for debugging, and demonstate to you
+    TreeNode *get_dir1_tree = find_parentPath(root,"/dir1/file2");
+    if(get_dir1_tree == get_dir1->subdirectory){
+        fprintf(stderr,"[%s ,%d]",__func__,__LINE__);
+        printf(" [Treenode]get_dir1_tree->dirName (%s) same [Filenode]get_dir1->name (%s)\n",get_dir1_tree->dirName,get_dir1->name);
+    }else{
+        printf("not same\n");
+    }
+    /**********************************************************/
+    //two Ways to get File(include dir itself) information
+    FileNode *get_file2 =NULL;
+    //1. absolute path, the root(treeNode) will always exist when initialize
+    get_file2 = fischl_find_entry(root,"/dir1/file2");
+    if(get_file2 == NULL){
+        printf("No dir1 under dir1\n");
+        return -1;
+    }else{
+        fprintf(stderr,"[%s ,%d]",__func__,__LINE__);
+        printf(" %s under %sdir1/\n",get_file2->name,root->dirName);
+    }
+    //2. relative path, the get_dir1(FileNode)->subdirectory(treeNode), use treeNode(dir) to find 
+    get_file2 = fischl_find_entry(get_dir1->subdirectory,"/file2");
+    if(get_file2 == NULL){
+        printf("No dir1 under %s\n",get_dir1->subdirectory->dirName);
+        return -1;
+    }else{
+        fprintf(stderr,"[%s ,%d]",__func__,__LINE__);
+        printf(" %s under %s\n",get_file2->name,get_dir1->subdirectory->dirName);
+    }
+    /**********************************************************/
+    //add one more file under dir1
+    INode inode_file3;
+    if(get_dir1->subdirectory != NULL){
+        fischl_add_entry(get_dir1_tree, 5, "file3",&inode_file3);
+        printf("add file3 in dir1\n");
+    }
+    FileNode *get_file3 =NULL;
+    //fischl_find_entry(get_dir1->subdirectory,"/file3"); are equivalent
+    get_file3 = fischl_find_entry(get_dir1_tree,"/file3");
+    if(get_file3 == NULL){
+        printf("No dir1 under %s\n",get_dir1_tree->dirName);
+        return -1;
+    }else{
+        printf(" %s under %s\n",get_file3->name,get_dir1_tree->dirName);
+    }
+    // Cleanup
+    freeTree(root);
+
+    return 0;
+}