16 files changed, 1514 insertions, 637 deletions

diff --git a/c_implementation/src/ak_datetime.c b/c_implementation/src/ak_datetime.c
new file mode 100644
index 0000000..71dcb18
--- /dev/null
+++ b/c_implementation/src/ak_datetime.c
@@ -0,0 +1,70 @@
+#include <libakdatetime.h>
+#include <stdio.h>
+#include <time.h>
+#include <string.h>
+#include <stdbool.h>
+#include <ctype.h>
+#include <stdlib.h>
+
+// Returns Unix timestamp (seconds since epoch)
+long ak_datetime_unix() {
+	return time(NULL);
+}
+
+// Returns Unix timestamp with nanoseconds
+void ak_datetime_unix_nanosecs(char *buffer, size_t size) {
+	struct timespec ts;
+	clock_gettime(CLOCK_REALTIME, &ts);
+	snprintf(buffer, size, "%ld.%09ld", ts.tv_sec, ts.tv_nsec);
+}
+
+// Returns human-readable datetime in format YYYYMMDD_HHMMSS
+void ak_datetime_human(char *buffer, size_t size) {
+	time_t now = time(NULL);
+	const struct tm *tm = gmtime(&now);
+	strftime(buffer, size, "%Y%m%d_%H%M%S", tm);
+}
+
+// Returns human-readable date in format YYYYMMDD
+void ak_datetime_human_date_only(char *buffer, size_t size) {
+	time_t now = time(NULL);
+	const struct tm *tm = gmtime(&now);
+	strftime(buffer, size, "%Y%m%d", tm);
+}
+
+// Returns yesterday's date in format YYYYMMDD
+void ak_datetime_human_date_only_yesterday(char *buffer, size_t size) {
+	time_t now = time(NULL);
+	now -= 24 * 60 * 60; // Subtract one day
+	const struct tm *tm = gmtime(&now);
+	strftime(buffer, size, "%Y%m%d", tm);
+}
+
+// Checks if string contains only digits
+static bool is_digits_only(const char *str) {
+	while (*str) {
+		if (!isdigit(*str)) {
+			return false;
+		}
+		str++;
+	}
+	return true;
+}
+
+// Converts Unix timestamp to human-readable format YYYYMMDD_HHMMSS
+bool ak_datetime_unix_to_human(const char *timestamp_str, char *buffer, size_t size) {
+	// Check if input is valid (10-digit number)
+	if (timestamp_str == NULL || strlen(timestamp_str) != 10 || !is_digits_only(timestamp_str)) {
+		return false;
+	}
+
+	time_t timestamp = (time_t)atol(timestamp_str);
+	const struct tm *tm = gmtime(&timestamp);
+	if (tm == NULL) {
+		return false;
+	}
+
+	strftime(buffer, size, "%Y%m%d_%H%M%S", tm);
+	return true;
+}
+
diff --git a/c_implementation/src/ak_fs.c b/c_implementation/src/ak_fs.c
new file mode 100644
index 0000000..8ede3f6
--- /dev/null
+++ b/c_implementation/src/ak_fs.c
@@ -0,0 +1,383 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <stdbool.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include <libakfs.h>
+#include <libaklog.h>
+#include <libaksettings.h>
+#include <sys/stat.h>
+#include <dirent.h>
+
+char* ak_fs_return_hash_path(const char* str)
+{
+    if ( ak_fs_verify_input_is_hash(str, strlen(str)) )
+    {
+        unsigned int i = 0;
+        char *result = malloc((128*2)+1);
+        if ( result == NULL )
+        {
+            return "";
+        }
+        while ( str[i] != '\0' )
+        {
+            result[i*2] = str[i];
+            if ( (i*2) + 1 <= 254 )
+            {
+                result[(i*2)+1] = '/';
+            }
+            else
+            {
+                result[(i*2)+1] = '\0';
+            }
+            ++i;
+        }
+        return result;
+    }
+    else
+    {
+        return NULL;
+    }
+}
+
+char* ak_fs_return_hash_dir(const char* str)
+{
+    if ( ak_fs_verify_input_is_hash(str, strlen(str)) )
+    {
+        unsigned int i = 0;
+        char *result = malloc((128*2)+1);
+        if ( result == NULL ) return "";
+        while ( str[i] != '\0' )
+        {
+            result[i*2] = str[i];
+            if ( (i*2) + 1 <= 254-2 )
+            {
+                result[(i*2)+1] = '/';
+            }
+            else
+            {
+                result[(i*2)+1] = '\0';
+            }
+            ++i;
+        }
+        return result;
+    }
+    else
+    {
+        return NULL;
+    }
+}
+
+bool ak_fs_verify_input_is_hash(const char* str, size_t len)
+{
+    size_t i = 0;
+    if (len != 128)
+    {
+        return false;
+    }
+    while ( str[i] != '\0' )
+    {
+        if (
+                i < 128 &&
+                !(
+                    ( str[i] >= 0x30 ) &&
+                    ( str[i] <= 0x39 || str[i] >= 0x61 ) &&
+                    ( str[i] <= 0x66 )
+                 )
+           )
+        {
+            return false;
+        }
+        else {
+            i++;
+        }
+    }
+    if ( i > 128 )
+    {
+        return false;
+    }
+    return true;
+}
+
+int ak_fs_create_dir_for_hash(const char* str)
+{
+    /* TODO
+     * Some aspects of this function
+     * 1. We need a "root" place to put our dirs into, this is not specified
+     *    anywhere in this code but it is spartially specified in other files
+     *    like lib/_ak_fs bash script and the rc/config file we currently source
+     *    in $HOME/.bashrc
+     * 2. We might need to "lock" onto some version of glibc and be aware of
+     *    other systems that do not use that one.
+     */
+    if ( ak_fs_verify_input_is_hash(str, strlen(str)) )
+    {
+        char* dir_path = ak_fs_return_hash_dir(str);
+        // We will need to separate the string so we can create the path one
+        // directory at the time
+        int len = strlen(dir_path);
+        for ( int i = 0; i < len+1; ++i)
+        {
+            if ( dir_path[i] == '/' )
+            {
+                //printf("%c\n", dir_path[i]);
+                //char* test = strndup(dir_path, i);
+                //printf("A: [i:%d] [c:%c] - %s\n", i, dir_path[i], test);
+                continue;
+            }
+            else
+            {
+                char* incremental_dir_path = strndup(dir_path, i+1);
+                // printf("B: [i:%d] [c:%c] - %s\n", i, dir_path[i], test);
+                struct stat sb;
+                if (stat(incremental_dir_path, &sb) == 0 && S_ISDIR(sb.st_mode))
+                {
+                    continue;
+                }
+                else
+                {
+                    int return_code = mkdir(incremental_dir_path, 0777);
+                    if ( return_code == 0 )
+                    {
+                        continue;
+                    }
+                    else
+                    {
+                        // should be unreachable I guess since previous checks
+                        // though it could be caused by some other kind of error
+                        // like, no permission, or exists but is not a directory
+                        // but a file, dev, char, pipe whatever this thing
+                        // supports anyway
+                        free(incremental_dir_path);
+                        free(dir_path);
+                        return -3;
+                    }
+                }
+                free(incremental_dir_path);
+            }
+        }
+        free(dir_path);
+        return 0;
+    }
+    else
+    {
+        return -2;
+    }
+}
+
+int ak_fs_convert_map_v3_string_to_struct(const char *str, size_t ssize, akfs_map_v3* map)
+{
+    size_t sa[] = { -1, -1, -1, -1, -1 };
+    size_t na[] = { -1, -1, -1 };
+    int spaces_found = 0;
+    int newlines_found = 0;
+    char original_hash_str[129] = {0};
+    char root_hash_str[129] = {0};
+    char filename[256] = {0};
+    if ( map == 0x0 )
+    {
+        printf("FAILED IN %s! : %p \n", __func__, (void*)map);
+        return 1;
+    }
+    for ( size_t i = 0; i < ssize; ++i)
+    {
+        if ( str[i] == ' ' )
+        {
+            sa[++spaces_found] = i;
+        }
+        if ( str[i] == '\n' )
+        {
+            na[++newlines_found] = i;
+        }
+    }
+    int si = 0;
+    for ( size_t i = 0; i < sa[1]; ++i)
+    {
+        original_hash_str[si] = str[i];
+        si++;
+    }
+    original_hash_str[si] = '\0';
+    if( !ak_fs_verify_input_is_hash(original_hash_str, strlen(original_hash_str)) )
+    {
+        ak_log_error(__func__, "original_hash_str not a hash");
+        return 1;
+    }
+    if ( ak_fs_sha512sum_string_to_struct(original_hash_str, &(map->oh)) != 0 )
+    {
+        ak_log_error(__func__, "String convertion of original_hash_str");
+        return 1;
+    }
+    si = 0;
+    for ( size_t i = na[1]+1; i < sa[3]; ++i)
+    {
+        root_hash_str[si] = str[i];
+        si++;
+    }
+    root_hash_str[si] = '\0';
+    if( !ak_fs_verify_input_is_hash(root_hash_str, strlen(root_hash_str)) )
+    {
+        ak_log_error(__func__, "root_hash_str not a hash");
+        return 1;
+    }
+    if ( ak_fs_sha512sum_string_to_struct(root_hash_str, &(map->rh)) != 0 )
+    {
+        ak_log_error(__func__, "String convertion of root_hash_str");
+        return 1;
+    }
+    si = 0;
+    if ( sa[2] < na[1] )
+    {
+        for ( size_t i = sa[2]+1; i < na[1]; ++i)
+        {
+            filename[si] = str[i];
+            si++;
+        }
+        filename[si] = '\0';
+    }
+    strncpy(map->filename, filename, sizeof(map->filename));
+    return 0;
+}
+
+void ak_fs_maps_v3_get_from_fs(akfs_map_v3 **ma, size_t length)
+{
+    (void)length;
+    DIR *d;
+    d = opendir(ak_fs_maps_v3_get_dir());
+    akfs_map_v3 *ptr = NULL;
+    ptr = *ma;
+    if (d)
+    {
+        const struct dirent *dir;
+        while((dir = readdir(d)) != NULL )
+        {
+            if (!ak_fs_verify_input_is_hash(dir->d_name, 128)) continue;
+            ak_fs_sha512sum_string_to_struct(dir->d_name, &(ptr->mh));
+            ++ptr;
+        }
+    }
+    closedir(d);
+}
+
+void ak_fs_init_string(char *str, size_t len)
+{
+    for (size_t i = 0; i < len; ++i)
+    {
+        str[i] = '\0';
+    }
+}
+
+int ak_fs_ls()
+{
+    size_t len = ak_fs_maps_v3_found_in_fs();
+    akfs_map_v3 map_store[len];
+    akfs_map_v3* maps_ptr = &map_store[0];
+    ak_fs_maps_v3_init(&maps_ptr, len);
+    ak_fs_maps_v3_get_from_fs(&maps_ptr, len);
+    ak_fs_maps_v3_resolve(&maps_ptr, len);
+    ak_fs_maps_v3_print_bif(&maps_ptr, len);
+    return 0;
+}
+
+int ak_fs_cat_file_from_root_hash(const sha512sum* rh)
+{
+    const char* chunks_dir = getenv("AK_CHUNKSDIR");
+    if ( chunks_dir == NULL )
+    {
+        ak_log_error(__func__, "No directory for chunks found");
+        return -2;
+    }
+    const char* leafs_dir = getenv("AK_LEAFSDIR");
+    if ( leafs_dir == NULL )
+    {
+        ak_log_error(__func__, "No directory for leafs found");
+        return -3;
+    }
+    FILE *fd;
+    char *fullpath;
+    bool is_chunk = false;
+    char root_hash_str[129] = {0};
+    ak_fs_sha512sum_struct_to_string(rh, root_hash_str);
+    if ( asprintf(&fullpath, "%s/%s", leafs_dir, root_hash_str) == -1 ) return -1;
+    fd = fopen(fullpath, "r");
+    if ( fd == NULL )
+    {
+        free(fullpath);
+        if ( asprintf(&fullpath, "%s/%s", chunks_dir, ak_fs_sha512sum_struct_read_as_string(rh)) == -1 ) return -1;
+        fd = fopen(fullpath, "r");
+        if ( fd == NULL )
+        {
+            ak_log_error(__func__, "Could not be found");
+            free(fullpath);
+            return 1;
+        }
+        is_chunk = true;
+    }
+    if ( !is_chunk )
+    {
+        char buffer[258] = {0};
+        size_t bytes_read = fread(&buffer, 1, sizeof(buffer), fd);
+        if ( bytes_read < sizeof(buffer) )
+        {
+            ak_log_error(__func__, "File is smaller than expected. Wrong format?");
+            fclose(fd);
+            free(fullpath);
+            return 2;
+        }
+        if ( buffer[128] != '\n' || buffer[257] != '\n' )
+        {
+            ak_log_error(__func__, "Unknown format");
+            fclose(fd);
+            free(fullpath);
+            return 2;
+        }
+        char h_str[129] = {0};
+        char t_str[129] = {0};
+        mt_branch h0;
+        ak_fs_sha512sum_init(&h0.root);
+        ak_fs_sha512sum_init(&h0.head);
+        ak_fs_sha512sum_init(&h0.tail);
+        h0.root = *rh;
+        memcpy(h_str, buffer, 128);
+        h_str[128] = '\0';
+        memcpy(t_str, buffer + 129, 128);
+        t_str[128] = '\0';
+        fclose(fd);
+        // free(fullpath);
+        ak_fs_sha512sum_string_to_struct(h_str, &h0.head);
+        ak_fs_sha512sum_string_to_struct(t_str, &h0.tail);
+        ak_fs_cat_file_from_root_hash(&h0.head);
+        if ( !ak_fs_sha512sum_compare(&h0.head, &h0.tail) ) ak_fs_cat_file_from_root_hash(&h0.tail);
+    }
+    else
+    {
+        struct stat sb;
+        if (stat(fullpath, &sb) == -1) {
+            perror("stat");
+            fclose(fd);
+            free(fullpath);
+            return 2;
+        }
+        char buffer[(long long) sb.st_size+1];
+        fread(&buffer, sizeof(buffer), 1, fd);
+        fclose(fd);
+        buffer[sizeof(buffer)-1] = '\0';
+        printf("%s", buffer);
+    }
+    free(fullpath);
+    return 0;
+}
+
+int ak_fs_cfm(akfs_map_v3* map)
+{
+    sha512sum x;
+    ak_fs_sha512sum_init(&x);
+    const sha512sum *rh_ptr = ak_fs_map_v3_get_root_hash(map);
+    if ( rh_ptr == NULL )
+    {
+        ak_log_debug(__func__, "No root hash found on the map");
+        return -1;
+    }
+    x = *rh_ptr;
+    return ak_fs_cat_file_from_root_hash(&x);
+}
diff --git a/c_implementation/src/ak_fs_defuse.c b/c_implementation/src/ak_fs_defuse.c
new file mode 100644
index 0000000..76514f6
--- /dev/null
+++ b/c_implementation/src/ak_fs_defuse.c
@@ -0,0 +1,98 @@
+#define FUSE_USE_VERSION 31
+#include <fuse3/fuse.h>
+#include <libakfs.h>
+#include <libaklog.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <stdlib.h>
+
+// Called when a file is read
+static int akfs_fuse_read(const char *path, char *buf, size_t size, off_t offset,
+		struct fuse_file_info *fi)
+{
+	(void) fi;  // Unused
+	const char *content = "Hello, World!\n";
+	size_t len = strlen(content);
+
+	if (strcmp(path, "/hello") != 0)  // Only support "/hello"
+		return -ENOENT;
+
+    if (offset < 0 || (size_t)offset >= len)
+		return 0;
+
+	size = (size < len - offset) ? size : len - offset;
+	memcpy(buf, content + offset, size);
+	return size;
+}
+
+// Called to list files in the root directory
+static int akfs_fuse_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
+		off_t offset, struct fuse_file_info *fi,
+		enum fuse_readdir_flags flags)
+{
+	(void) offset; (void) fi; (void) flags;  // Unused
+
+	if (strcmp(path, "/") != 0)  // Only support root dir
+		return -ENOENT;
+
+	filler(buf, ".", NULL, 0, 0);
+	filler(buf, "..", NULL, 0, 0);
+
+    // example file
+	filler(buf, "hello", NULL, 0, 0);
+
+    // ak fs integration
+    size_t ms_len = ak_fs_maps_v3_found_in_fs();
+    akfs_map_v3 map_store[ms_len];
+    akfs_map_v3* mps_ptr = &map_store[0];
+    void* mps_start = &map_store[0];
+    (void)mps_start;
+    ak_fs_maps_v3_init(&mps_ptr, ms_len);
+    ak_fs_maps_v3_resolve(&mps_ptr, ms_len);
+    akfs_map_v3 *ptr = NULL;
+    for (ptr = mps_ptr; ptr < mps_ptr + ms_len; ++ptr)
+    {
+        if ( ak_fs_map_v3_is_null(ptr) )
+        {
+            ak_fs_map_v3_print_filename(ptr);
+            filler(buf, ak_fs_map_v3_get_filename(ptr), NULL, 0, 0);
+        }
+    }
+
+    return 0;
+}
+
+// Called to get file attributes (metadata)
+static int akfs_fuse_getattr(const char *path, struct stat *st, struct fuse_file_info *fi)
+{
+	(void) fi;
+	st->st_uid = getuid();
+	st->st_gid = getgid();
+	st->st_atime = st->st_mtime = time(NULL);
+
+	if (strcmp(path, "/") == 0) {
+		st->st_mode = S_IFDIR | 0755;  // Directory
+		st->st_nlink = 2;
+	} else if (strcmp(path, "/hello") == 0) {
+		st->st_mode = S_IFREG | 0644;  // Regular file
+		st->st_nlink = 1;
+		st->st_size = strlen("Hello, World!\n");
+	} else {
+		return -ENOENT;  // Not found
+	}
+	return 0;
+}
+
+// FUSE operations struct (only implementing needed functions)
+static struct fuse_operations akfs_fuse_ops = {
+	.getattr = akfs_fuse_getattr,
+	.readdir = akfs_fuse_readdir,
+	.read = akfs_fuse_read,
+};
+
+int main(int argc, char *argv[])
+{
+	return fuse_main(argc, argv, &akfs_fuse_ops, NULL);
+}
diff --git a/c_implementation/src/ak_fs_main.c b/c_implementation/src/ak_fs_main.c
new file mode 100644
index 0000000..e399544
--- /dev/null
+++ b/c_implementation/src/ak_fs_main.c
@@ -0,0 +1,51 @@
+#include <getopt.h>
+#include <stdio.h>
+#include <libaklog.h>
+#include <libakfs.h>
+
+static int ak_fs_usage()
+{
+    ak_log_debug(__func__, "Available commands:");
+    ak_log_debug(__func__, "akfs --list");
+    ak_log_debug(__func__, "akfs --cfm <map hash>");
+    return 1;
+}
+
+int ak_fs_main(int argc, char** argv)
+{
+    int option;
+    int logind = 0;
+    akfs_map_v3 map;
+    static struct option long_options[] = {
+        {"help", no_argument, 0, 'h'},
+        {"list", no_argument, 0, 'l'},
+        {"cfm", required_argument, 0, 'C'},
+        {0,0,0,0}
+    };
+    while(1)
+    {
+        option = getopt_long(argc, argv, "hlC:", long_options, &logind);
+        if ( option == -1 ) return ak_fs_usage();
+        switch(option)
+        {
+            case 'h':
+                return ak_fs_usage();
+            case 'l':
+                return ak_fs_ls();
+            case 'C':
+                ak_fs_map_v3_init(&map);
+                if ( ak_fs_sha512sum_string_to_struct(optarg, &map.mh) != 0 ) return -1;
+                if ( ak_fs_map_v3_open_from_file(&map) != 0 ) return -2;
+                return ak_fs_cfm(&map);
+            default:
+                printf("double lol\n");
+                return 4;
+        }
+    }
+    return 0;
+}
+
+int main(int argc, char **argv)
+{
+    return ak_fs_main(argc, argv);
+}
diff --git a/c_implementation/src/ak_fs_map_v3.c b/c_implementation/src/ak_fs_map_v3.c
new file mode 100644
index 0000000..1d3e37e
--- /dev/null
+++ b/c_implementation/src/ak_fs_map_v3.c
@@ -0,0 +1,213 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <libakfs.h>
+#include <libaklog.h>
+#include <sys/stat.h>
+
+// const char maps_dir[] = "/home/kaotisk/.arching-kaos/akfs/maps/";
+
+void ak_fs_map_v3_init(akfs_map_v3 *map)
+{
+    ak_fs_sha512sum_init(&map->oh);
+    ak_fs_sha512sum_init(&map->rh);
+    ak_fs_sha512sum_init(&map->mh);
+    ak_fs_init_string(map->filename, 256);
+}
+
+bool ak_fs_map_v3_compare(akfs_map_v3* a, akfs_map_v3* b)
+{
+    return (
+            (ak_fs_sha512sum_compare(&a->oh, &b->oh) == true) &&
+            (ak_fs_sha512sum_compare(&a->rh, &b->rh) == true) &&
+            (ak_fs_sha512sum_compare(&a->mh, &b->mh) == true) &&
+            (strcmp(a->filename, b->filename) == 0)
+           );
+}
+
+
+bool ak_fs_map_v3_is_null(akfs_map_v3* m)
+{
+    akfs_map_v3 n;
+    ak_fs_map_v3_init(&n);
+    if ( ak_fs_map_v3_compare(m, &n) )
+    {
+        ak_log_debug(__func__, "true");
+    }
+    else
+    {
+        ak_log_debug(__func__, "false");
+    }
+    return ak_fs_map_v3_compare(m, &n);
+}
+
+void ak_fs_map_v3_print_map_hash(akfs_map_v3 *map)
+{
+    if( !ak_fs_sha512sum_is_null(&(map->mh)) )
+    {
+        char str[129] = {0};
+        char* s = &str[0];
+        ak_fs_sha512sum_struct_to_string(&(map->mh), s);
+        printf("%s", s);
+    }
+    else
+    {
+        ak_log_debug(__func__,"hash is null");
+    }
+}
+
+void ak_fs_map_v3_print_original_hash(akfs_map_v3 *map)
+{
+    if (!ak_fs_sha512sum_is_null(&(map->oh)))
+    {
+        printf("%s", ak_fs_sha512sum_struct_read_as_string(&(map->oh)));
+    }
+    else
+    {
+        ak_log_debug(__func__,"hash is null");
+    }
+}
+
+void ak_fs_map_v3_print_root_hash(akfs_map_v3 *map)
+{
+    if (!ak_fs_sha512sum_is_null(&(map->rh)))
+    {
+        printf("%s", ak_fs_sha512sum_struct_read_as_string(&(map->rh)));
+    }
+    else
+    {
+        ak_log_debug(__func__,"hash is null");
+    }
+}
+
+sha512sum* ak_fs_map_v3_get_map_hash(akfs_map_v3 *map)
+{
+    return &(map->mh);
+}
+
+sha512sum* ak_fs_map_v3_get_root_hash(akfs_map_v3 *map)
+{
+    if (!ak_fs_sha512sum_is_null(&(map->rh)))
+    {
+        return &(map->rh);
+    }
+    else
+    {
+        return NULL;
+    }
+}
+
+sha512sum* ak_fs_map_v3_get_orig_hash(akfs_map_v3 *map)
+{
+    if (!ak_fs_sha512sum_is_null(&(map->oh)))
+    {
+        return &(map->oh);
+    }
+    else
+    {
+        return NULL;
+    }
+}
+
+char* ak_fs_map_v3_get_filename(akfs_map_v3 *map)
+{
+    return map->filename;
+}
+
+void ak_fs_map_v3_print_filename(akfs_map_v3 *map)
+{
+    printf("%s", ak_fs_map_v3_get_filename(map));
+}
+
+void ak_fs_map_v3_print(akfs_map_v3 *map)
+{
+    printf("map_v3 {");
+    printf("\n .mh: ");
+    ak_fs_map_v3_print_map_hash(map);
+    printf("\n .oh: ");
+    ak_fs_map_v3_print_original_hash(map);
+    printf("\n .rh: ");
+    ak_fs_map_v3_print_root_hash(map);
+    printf("\n .fn: ");
+    ak_fs_map_v3_print_filename(map);
+    printf("\n}\n");
+}
+
+void ak_fs_map_v3_print_as_json(akfs_map_v3 *map)
+{
+    printf("{\"type\":\"map_v3\",");
+    printf("\"map\":\"");
+    ak_fs_map_v3_print_map_hash(map);
+    printf("\",");
+    printf("\"original\":\"");
+    ak_fs_map_v3_print_original_hash(map);
+    printf("\",");
+    printf("\"root\":\"");
+    ak_fs_map_v3_print_root_hash(map);
+    printf("\",");
+    printf("\"filename\":\"");
+    ak_fs_map_v3_print_filename(map);
+    printf("\"");
+    printf("}\n");
+}
+
+void ak_fs_map_v3_print_bif(akfs_map_v3 *map)
+{
+    ak_fs_map_v3_print_map_hash(map);
+    printf(" ");
+    ak_fs_map_v3_print_root_hash(map);
+    printf(" ");
+    ak_fs_map_v3_print_filename(map);
+}
+
+int ak_fs_map_v3_open_from_file(akfs_map_v3 * map)
+{
+    if (map==0x0)
+    {
+        ak_log_debug(__func__, "Zeropointer");
+        return 1;
+    }
+    FILE *fd;
+    char *full_path = {0};
+    asprintf(&full_path,
+            "%s/%s",
+            ak_fs_maps_v3_get_dir(),
+            ak_fs_sha512sum_struct_read_as_string(ak_fs_map_v3_get_map_hash(map))
+            );
+    // printf("Trying path: %s\n", full_path);
+    fd = fopen(full_path, "rb");
+    if (!fd)
+    {
+        // perror("fopen");
+        ak_log_debug(__func__, "File not found or other error");
+        free(full_path);
+        return 1;
+    }
+    struct stat sb;
+    if (stat(full_path, &sb) == -1) {
+        perror("stat");
+        fclose(fd);
+        free(full_path);
+        return 2;
+    }
+    // File size: %lld in bytes: (long long) sb.st_size);
+    char buffer[(long long) sb.st_size+1];
+    fread(&buffer, sizeof(buffer), (long long) sb.st_size, fd);
+    // ak_fs_sha512sum_string_to_struct(maphash, &(map->mh));
+    if ( ak_fs_convert_map_v3_string_to_struct(buffer, strlen(buffer), map) != 0 )
+    {
+        ak_log_debug(__func__,"conversion failed");
+        fclose(fd);
+        free(full_path);
+        return 1;
+    }
+    fclose(fd);
+    free(full_path);
+    return 0;
+}
+
+int ak_fs_map_v3_to_file(akfs_map_v3 maphash)
+{
+    (void)maphash;
+    return 0;
+}
diff --git a/c_implementation/src/ak_fs_map_v4.c b/c_implementation/src/ak_fs_map_v4.c
new file mode 100644
index 0000000..3fea244
--- /dev/null
+++ b/c_implementation/src/ak_fs_map_v4.c
@@ -0,0 +1,8 @@
+#include <libaklog.h>
+#include <libakfs.h>
+
+void ak_fs_map_v4_init(akfs_map_v4* map)
+{
+    (void)map;
+    ak_log_debug(__func__, "Not implemented");
+}
diff --git a/c_implementation/src/ak_fs_maps_v3.c b/c_implementation/src/ak_fs_maps_v3.c
new file mode 100644
index 0000000..a5060b2
--- /dev/null
+++ b/c_implementation/src/ak_fs_maps_v3.c
@@ -0,0 +1,98 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <dirent.h>
+#include "libakfs.h"
+
+const char* ak_fs_maps_v3_get_dir()
+{
+    return getenv("AK_MAPSDIR");
+}
+
+void ak_fs_maps_v3_init(akfs_map_v3** ms, size_t l)
+{
+    akfs_map_v3 *m = NULL;
+    for (m = *ms; m < *ms+l; ++m)
+    {
+        ak_fs_map_v3_init(m);
+    }
+}
+
+void ak_fs_maps_v3_print_map_hashes(akfs_map_v3** m, size_t s)
+{
+    akfs_map_v3 *ptr = NULL;
+    for (ptr = *m; ptr < *m+s; ++ptr)
+    {
+        if ( !ak_fs_map_v3_is_null(ptr) ) ak_fs_map_v3_print_map_hash(ptr);
+    }
+}
+
+void ak_fs_maps_v3_print_filenames(akfs_map_v3** m, size_t s)
+{
+    akfs_map_v3 *ptr = NULL;
+    for (ptr = *m; ptr < *m+s; ++ptr)
+    {
+        if ( ptr != NULL )
+        {
+            ak_fs_map_v3_print_filename(ptr);
+            printf("\n");
+        }
+    }
+}
+
+void ak_fs_maps_v3_print(akfs_map_v3 **map_store, size_t length)
+{
+    akfs_map_v3 *ptr = NULL;
+    for ( ptr = *map_store; ptr < *map_store + length; ++ptr)
+    {
+        ak_fs_map_v3_print(ptr);
+        printf("\n");
+    }
+}
+
+void ak_fs_maps_v3_print_as_json(akfs_map_v3 **map_store, size_t length)
+{
+    akfs_map_v3 *ptr = NULL;
+    for ( ptr = *map_store; ptr < *map_store + length; ++ptr)
+    {
+        ak_fs_map_v3_print_as_json(ptr);
+    }
+}
+
+void ak_fs_maps_v3_print_bif(akfs_map_v3 **map_store, size_t length)
+{
+    akfs_map_v3 *ptr = NULL;
+    for ( ptr = *map_store; ptr < *map_store + length; ++ptr)
+    {
+        ak_fs_map_v3_print_bif(ptr);
+        printf("\n");
+    }
+}
+
+size_t ak_fs_maps_v3_found_in_fs()
+{
+    DIR *d;
+    size_t counter = 0;
+    d = opendir(ak_fs_maps_v3_get_dir());
+    if (d)
+    {
+        const struct dirent *dir;
+        while ((dir = readdir(d)) != NULL )
+        {
+            if (ak_fs_verify_input_is_hash(dir->d_name, strlen(dir->d_name))) counter++;
+        }
+    }
+    closedir(d);
+    return counter;
+}
+
+int ak_fs_maps_v3_resolve(akfs_map_v3 **ms, size_t ms_len)
+{
+    akfs_map_v3 *ptr = NULL;
+    for ( ptr = *ms; ptr < *ms+ms_len; ++ptr)
+    {
+        if ( ak_fs_sha512sum_is_null(&(ptr->mh)) ) continue;
+        ak_fs_map_v3_open_from_file(ptr);
+    }
+    return 0;
+}
diff --git a/c_implementation/src/ak_fs_mt.c b/c_implementation/src/ak_fs_mt.c
new file mode 100644
index 0000000..2c3414b
--- /dev/null
+++ b/c_implementation/src/ak_fs_mt.c
@@ -0,0 +1,52 @@
+#include <stdio.h>
+#include <libakfs.h>
+#include <libaklog.h>
+#include <stdbool.h>
+
+bool ak_fs_mt_branch_is_null(mt_branch* n)
+{
+    if ( n == NULL )
+    {
+        ak_log_warning(__func__, "A NULL mt_branch* node was given");
+        return false;
+    }
+    if (
+            ak_fs_sha512sum_is_null(&n->root) &&
+            ak_fs_sha512sum_is_null(&n->head) &&
+            ak_fs_sha512sum_is_null(&n->tail)
+       )
+    {
+        return true;
+    }
+    return false;
+}
+
+bool ak_fs_mt_branch_compare(mt_branch *a, mt_branch *b)
+{
+    if ( a == NULL || b == NULL )
+    {
+        ak_log_warning(__func__, "One or two NULL mt_branch* node was given");
+        return false;
+    }
+    if (
+            ak_fs_sha512sum_compare(&a->root, &b->root) &&
+            ak_fs_sha512sum_compare(&a->head, &b->head) &&
+            ak_fs_sha512sum_compare(&a->tail, &b->tail)
+       )
+    {
+        return true;
+    }
+    return false;
+}
+
+void ak_fs_mt_branch_print(mt_branch *n)
+{
+    if ( n == NULL )
+    {
+        ak_log_warning(__func__, "NULL mt_branch* was given");
+        return;
+    }
+    printf("r: %s\n", ak_fs_sha512sum_struct_read_as_string(&n->root));
+    printf("h: %s\n", ak_fs_sha512sum_struct_read_as_string(&n->head));
+    printf("t: %s\n", ak_fs_sha512sum_struct_read_as_string(&n->tail));
+}
diff --git a/c_implementation/src/ak_fs_sha512sum.c b/c_implementation/src/ak_fs_sha512sum.c
new file mode 100644
index 0000000..619269f
--- /dev/null
+++ b/c_implementation/src/ak_fs_sha512sum.c
@@ -0,0 +1,221 @@
+#include <libakfs.h>
+#include <libaklog.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <string.h>
+
+void ak_fs_sha512sum_init(sha512sum *hash)
+{
+    for (int i = 0; i < 8; ++i)
+    {
+        hash->sum[i] = 0x0;
+    }
+}
+
+bool ak_fs_sha512sum_compare(const sha512sum* a, const sha512sum* b)
+{
+    for ( int i = 0; i < 8; ++i )
+    {
+        if ( a->sum[i] != b->sum[i] ) return false;
+    }
+    return true;
+}
+
+void ak_fs_sha512sum_reset_struct(sha512sum* m)
+{
+    for (size_t i = 0; i < 8; ++i)
+    {
+        m->sum[i] = 0;
+    }
+}
+
+void ak_fs_sha512sum_init_avail(sha512sum** m, size_t s)
+{
+    sha512sum *ptr = NULL;
+    for (ptr = *m; ptr < *m+s; ++m)
+    {
+        ak_fs_sha512sum_reset_struct(ptr);
+    }
+}
+
+char* ak_fs_sha512sum_struct_read_as_string(const sha512sum *ptr)