diff --git a/src/create.c b/src/create.c
index c4986f7..05bfa61 100644
--- a/src/create.c
+++ b/src/create.c
@@ -1,17 +1,221 @@
 #include "bin.h"
 #include "commands.h"
+#include "b-tree.h"
 
 #include <blue/cmd.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <zstd.h>
 
+#define INVALID_NODE_PTR    0xFFFF
+
+#define ORDER               6
+#define MAX                 (ORDER - 1)
+#define MIN                 (MAX / 2)
+
 enum {
 	ARG_INPATH,
 	OPT_OUTPATH,
 	OPT_OUTPATH_PATH,
 };
 
+struct entry
+{
+	uint32_t key;
+	uint32_t value;
+};
+
+struct node {
+	uint16_t nr_entries;
+	struct entry entries[MAX];
+	uint16_t children[ORDER];
+};
+
+struct data_tree {
+	struct b_tree base;
+	FILE *fp;
+};
+
+static int node_init(struct node *n)
+{
+	memset(n, 0x0, sizeof * n);
+
+	for (int i = 0; i < ORDER; i++) {
+		n->children[i] = INVALID_NODE_PTR;
+	}
+
+	return 0;
+}
+
+static int tree_get_node(struct b_tree *p, unsigned long id, b_tree_node *n)
+{
+	struct data_tree *tree = (struct data_tree *)p;
+	size_t offset = (id * sizeof(struct node));
+	fseek(tree->fp, offset, SEEK_SET);
+	size_t r = fread(n, sizeof(struct node), 1, tree->fp);
+	return r == 1 ? 0 : -1;
+}
+
+static int tree_put_node(struct b_tree *p, unsigned long id, const b_tree_node *n)
+{
+	struct data_tree *tree = (struct data_tree *)p;
+	size_t offset = (id * sizeof(struct node));
+	fseek(tree->fp, offset, SEEK_SET);
+	size_t r = fwrite(n, sizeof(struct node), 1, tree->fp);
+	return r == 1 ? 0 : -1;
+}
+
+static long tree_alloc_node(struct b_tree *p)
+{
+	struct data_tree *tree = (struct data_tree *)p;
+	size_t pos = ftell(tree->fp);
+	fseek(tree->fp, 0, SEEK_END);
+	size_t len = ftell(tree->fp);
+
+	struct node n;
+	node_init(&n);
+
+	fwrite(&n, sizeof n, 1, tree->fp);
+
+	fseek(tree->fp, pos, SEEK_SET);
+
+	len /= sizeof(struct node);
+
+	return (long)len;
+}
+
+static unsigned long node_get_nr_entries(b_tree_node *n)
+{
+	struct node *node = (struct node *)n;
+	return node->nr_entries;
+}
+
+static void node_set_nr_entries(b_tree_node *n, unsigned long val)
+{
+	struct node *node = (struct node *)n;
+	node->nr_entries = val;
+}
+
+static b_tree_node_entry *node_get_entries(b_tree_node *n)
+{
+	struct node *node = (struct node *)n;
+	return (b_tree_node_entry *)node->entries;
+}
+
+static uint16_t *node_get_children(b_tree_node *n)
+{
+	struct node *node = (struct node *)n;
+	return node->children;
+}
+
+static int entry_compare(const b_tree_node_entry *e0, const b_tree_node_entry *e1)
+{
+	struct entry *a = (struct entry *)e0, *b = (struct entry *)e1;
+
+	if (a->key < b->key) {
+		return -1;
+	}
+
+	if (a->key > b->key) {
+		return 1;
+	}
+
+	return 0;
+}
+
+static const struct b_tree_ops ops = {
+	.node_size = sizeof(struct node),
+	.entry_size = sizeof(struct entry),
+
+	.tree_get_node = tree_get_node,
+	.tree_put_node = tree_put_node,
+	.tree_alloc_node = tree_alloc_node,
+
+	.node_get_nr_entries = node_get_nr_entries,
+	.node_set_nr_entries = node_set_nr_entries,
+	.node_get_entries = node_get_entries,
+	.node_get_children = node_get_children,
+
+	.entry_compare = entry_compare,
+};
+
+void indent(int depth)
+{
+	for (int i = 0; i < depth; i++) {
+		fputs("  ", stdout);
+	}
+}
+
+int node_print(struct b_tree *tree, struct node *n, int depth)
+{
+	int c_before = (n->nr_entries + 1) / 2;
+	int c_after = n->nr_entries + 1 - c_before;
+	int i_before = 0;
+	int i_after = i_before + c_before;
+
+	int err = 0;
+
+	for (unsigned short i = 0; i < c_before; i++) {
+		struct node child;
+		int index = i_before + i;
+
+		if (n->children[index] == INVALID_NODE_PTR) {
+			// indent(depth + 1);
+			continue;
+		}
+
+		err = tree_get_node(tree, n->children[index], (b_tree_node *)&child);
+		if (err != 0) {
+			printf("ERR: failed to read node %u\n",
+				n->children[index]);
+			continue;
+		}
+
+		node_print(tree, &child, depth + 1);
+	}
+
+	indent(depth);
+	printf("[");
+
+	for (unsigned short i = 0; i < n->nr_entries; i++) {
+		if (i > 0) {
+			printf(" ");
+		}
+
+		printf("%d", n->entries[i].key);
+	}
+
+	printf("]\n");
+
+	for (unsigned short i = 0; i < c_after; i++) {
+		struct node child;
+		int index = i_after + i;
+
+		if (n->children[index] == INVALID_NODE_PTR) {
+			// indent(depth + 1);
+			continue;
+		}
+
+		err = tree_get_node(tree, n->children[index], (b_tree_node *)&child);
+		if (err != 0) {
+			printf("ERR: failed to read node %u\n",
+				n->children[index]);
+			continue;
+		}
+
+		node_print(tree, &child, depth + 1);
+	}
+
+	return 0;
+}
+
+int tree_print(struct b_tree *tree)
+{
+	struct node root;
+	tree_get_node(tree, 0, (b_tree_node *)&root);
+	return node_print(tree, &root, 0);
+}
+
 static int create(
 	const b_command *self,
 	const b_arglist *opt,
@@ -19,16 +223,6 @@ static int create(
 {
 	const char *in_path = NULL, *out_path = NULL;
 
-	printf("cluster group = %zu\n", sizeof(struct ec3_cluster_group));
-	printf("chunk group = %zu\n", sizeof(struct ec3_chunk_group));
-	printf("vnode group = %zu\n", sizeof(struct ec3_vnode_group));
-	printf("vnch group = %zu\n", sizeof(struct ec3_vnode_chunk_group));
-	printf("vnode = %zu\n", sizeof(struct ec3_vnode));
-	printf("chunk = %zu\n", sizeof(struct ec3_chunk));
-	printf("link = %zu\n", sizeof(struct ec3_vnode_chunk));
-
-	return 0;
-
 	b_arglist_get_string(
 		opt,
 		B_COMMAND_INVALID_ID,
@@ -40,72 +234,28 @@ static int create(
 	printf("in path: %s\n", in_path);
 	printf("out path: %s\n", out_path);
 
-	size_t in_bufsz = ZSTD_CStreamInSize();
-	size_t out_bufsz = ZSTD_CStreamOutSize();
+	FILE *fp = fopen(out_path, "w+b");
 
-	printf("in buffer: %zu\n", in_bufsz);
-	printf("out buffer: %zu\n", out_bufsz);
+	struct node root;
+	node_init(&root);
+	fwrite(&root, sizeof root, 1, fp);
 
-	FILE *in = fopen(in_path, "rb");
-	if (!in) {
-		return -1;
+	struct data_tree tree;
+	b_tree_init(&tree.base, &ops, ORDER);
+	tree.fp = fp;
+
+
+	for (int i = 1; i <= 32; i++) {
+		int key = rand() % 65535;
+		//int key = i;
+		// printf("%d: adding [%d]\n", i, key);
+		struct entry e = { .key = key, .value = key * 2 };
+		b_tree_put(&tree.base, (b_tree_node_entry *)&e);
 	}
 
-	FILE *out = fopen(out_path, "wb");
-	if (!out) {
-		return -1;
-	}
-
-	ZSTD_CCtx *zstd = ZSTD_createCCtx();
-	ZSTD_CCtx_setParameter(zstd, ZSTD_c_compressionLevel, 22);
-	ZSTD_CCtx_setParameter(zstd, ZSTD_c_checksumFlag, 1);
-
-	void *in_buf = malloc(in_bufsz);
-	void *out_buf = malloc(out_bufsz);
-
-	size_t total = 0;
-
-	while (1) {
-		size_t r = fread(in_buf, 1, in_bufsz, in);
-		if (r == 0) {
-			break;
-		}
-
-		if ((total % 0x1000000) == 0) {
-			printf("read %zu MB bytes\n", total / 1000000);
-		}
-		total += r;
-
-		bool last_chunk = r < in_bufsz;
-		ZSTD_EndDirective mode
-			= last_chunk ? ZSTD_e_end : ZSTD_e_continue;
-
-		ZSTD_inBuffer input = {in_buf, r, 0};
-		int finished;
-		do {
-			ZSTD_outBuffer output = {out_buf, out_bufsz, 0};
-			size_t remaining = ZSTD_compressStream2(
-				zstd,
-				&output,
-				&input,
-				mode);
-
-			fwrite(out_buf, 1, output.pos, out);
-
-			finished = last_chunk ? (remaining == 0)
-			                      : (input.pos == input.size);
-		} while (!finished);
-
-		if (last_chunk) {
-			break;
-		}
-	}
-
-	ZSTD_freeCCtx(zstd);
-	fclose(out);
-	fclose(in);
-	free(in_buf);
-	free(out_buf);
+	tree_print(&tree.base);
+	
+	fclose(fp);
 
 	return 0;
 }