diff --git a/src/fio.zig b/src/fio.zig
index 46eb711..76d2733 100644
--- a/src/fio.zig
+++ b/src/fio.zig
@@ -136,6 +136,23 @@ pub extern fn fiobj_hash_haskey(hash: FIOBJ, key: FIOBJ) c_int;
 pub extern fn fiobj_ary_push(ary: FIOBJ, obj: FIOBJ) void;
 pub extern fn fiobj_float_new(num: f64) FIOBJ;
 pub extern fn fiobj_num_new_bignum(num: isize) FIOBJ;
+
+pub extern fn fiobj_data_newstr() FIOBJ;
+pub extern fn fiobj_data_newstr2(buffer: ?*anyopaque, length: usize, dealloc: ?*const fn (?*anyopaque) callconv(.C) void) FIOBJ;
+pub extern fn fiobj_data_newtmpfile() FIOBJ;
+pub extern fn fiobj_data_newfd(fd: c_int) FIOBJ;
+pub extern fn fiobj_data_slice(parent: FIOBJ, offset: isize, length: usize) FIOBJ;
+pub extern fn fiobj_data_save(io: FIOBJ, filename: [*c]const u8) c_int;
+pub extern fn fiobj_data_read(io: FIOBJ, length: isize) fio_str_info_s;
+pub extern fn fiobj_data_read2ch(io: FIOBJ, token: u8) fio_str_info_s;
+pub extern fn fiobj_data_pos(io: FIOBJ) isize;
+pub extern fn fiobj_data_len(io: FIOBJ) isize;
+pub extern fn fiobj_data_seek(io: FIOBJ, position: isize) void;
+pub extern fn fiobj_data_pread(io: FIOBJ, start_at: isize, length: usize) fio_str_info_s;
+pub extern fn fiobj_data_write(io: FIOBJ, buffer: ?*anyopaque, length: usize) isize;
+pub extern fn fiobj_data_puts(io: FIOBJ, buffer: ?*anyopaque, length: usize) isize;
+pub extern fn fiobj_data_assert_dynamic(io: FIOBJ) void;
+
 pub extern fn fiobj_free_wrapped(o: FIOBJ) callconv(.C) void;
 pub fn fiobj_null() callconv(.C) FIOBJ {
     return @as(FIOBJ, @bitCast(@as(c_long, FIOBJ_T_NULL)));
diff --git a/src/zap.zig b/src/zap.zig
index cbda609..5c67bd1 100644
--- a/src/zap.zig
+++ b/src/zap.zig
@@ -590,6 +590,7 @@ pub const HttpParamBinaryFile = struct {
     mimetype: ?[]const u8 = null,
     /// filename
     filename: ?[]const u8 = null,
+
     pub fn format(value: @This(), comptime _: []const u8, _: std.fmt.FormatOptions, writer: anytype) std.os.WriteError!void {
         const d = value.data orelse "\\0";
         const m = value.mimetype orelse "null";
@@ -611,15 +612,27 @@ pub fn Fiobj2HttpParam(o: fio.FIOBJ, a: std.mem.Allocator, dupe_string: bool) !?
             const key_name = fio.fiobj_str_new("name", 4);
             const key_data = fio.fiobj_str_new("data", 4);
             const key_type = fio.fiobj_str_new("type", 4);
-            // files: they should have "data", "type", and "filename" keys
+            defer {
+                fio.fiobj_free_wrapped(key_name);
+                fio.fiobj_free_wrapped(key_data);
+                fio.fiobj_free_wrapped(key_type);
+            } // files: they should have "data", "type", and "filename" keys
             if (fio.fiobj_hash_haskey(o, key_data) == 1 and fio.fiobj_hash_haskey(o, key_type) == 1 and fio.fiobj_hash_haskey(o, key_name) == 1) {
-                // TODO: Fill the fields
-
                 const filename = fio.fiobj_obj2cstr(fio.fiobj_hash_get(o, key_name));
                 const mimetype = fio.fiobj_obj2cstr(fio.fiobj_hash_get(o, key_type));
+                const data = fio.fiobj_hash_get(o, key_data);
+
+                // the data
+                const data_len = fio.fiobj_data_len(data);
+                const data_buf = fio.fiobj_data_read(data, data_len);
+
+                if (data_buf.len != data_len) {
+                    std.log.warn("WARNING: HTTP param binary file size mismatch: should {d}, is: {d}", .{ data_len, data_buf.len });
+                }
                 return .{ .Unsupported_Hash = .{
                     .filename = filename.data[0..filename.len],
                     .mimetype = mimetype.data[0..mimetype.len],
+                    .data = data_buf.data[0..data_buf.len],
                 } };
             } else {
                 return .{ .Unsupported_Hash = .{} };