+static VALUE
+chunk_init (VALUE self, VALUE tag, VALUE data)
+{
+ long tag_len, data_len, tmp;
+
+ StringValue (tag);
+ StringValue (data);
+
+ if (rb_funcall (tag, id_include, 1, INT2FIX (0)) == Qtrue)
+ rb_raise (rb_eArgError, "tag must not contain binary zeroes");
+
+ /* libeet uses a signed 32bit integer to store the
+ * chunk size, so make sure we don't overflow it
+ */
+ tag_len = RSTRING (tag)->len;
+ data_len = RSTRING (data)->len;
+ tmp = tag_len + 1 + data_len;
+
+ if (tmp < tag_len || tmp < data_len || tmp < 1 || tmp >= 2147483647L)
+ rb_raise (rb_eArgError, "tag or data too long");
+
+ rb_ivar_set (self, id_tag, rb_str_dup_frozen (tag));
+ rb_ivar_set (self, id_data, rb_str_dup_frozen (data));
+
+ return self;
+}
+
+static VALUE
+chunk_to_s (VALUE self)
+{
+ VALUE tmp, ret;
+ unsigned int size, buf_len;
+ unsigned char *buf;
+ struct RString *tag, *data;
+
+ tmp = rb_ivar_get (self, id_tag);
+ tag = RSTRING (tmp);
+
+ tmp = rb_ivar_get (self, id_data);
+ data = RSTRING (tmp);
+
+ buf_len = 9 + tag->len + data->len;
+ ret = rb_str_buf_new (buf_len);
+
+ buf = RSTRING (ret)->ptr;
+ RSTRING (ret)->len = buf_len;
+
+ memcpy (buf, "CHnK", 4);
+ buf += 4;
+
+ size = tag->len + data->len + 1;
+ size = BSWAP32 (size);
+ memcpy (buf, &size, 4);
+ buf += 4;
+
+ memcpy (buf, tag->ptr, tag->len);
+ buf += tag->len;
+
+ *buf++ = 0;
+
+ memcpy (buf, data->ptr, data->len);
+
+ return ret;
+}
+
+static int
+for_each_prop (VALUE tag, VALUE arg, VALUE stream)
+{
+ VALUE value, type, tmp;
+
+ if (rb_obj_is_kind_of (arg, rb_cArray) == Qfalse)
+ rb_raise (ePropError, "hash value is not an array");
+
+ value = rb_ary_entry (arg, 0);
+ if (NIL_P (value))
+ return ST_CONTINUE;
+
+ type = rb_ary_entry (arg, 1);
+ tmp = rb_funcall (value, id_to_eet_chunks, 2, tag, type);
+
+ rb_ary_concat (stream, tmp);
+
+ return ST_CONTINUE;
+}
+
+/*
+ * call-seq:
+ * object.to_eet -> string
+ *
+ * Serializes the receiver to EET format.
+ */
+static VALUE
+c_to_eet (VALUE self)
+{
+ VALUE props, name, stream, chunk, args[2];
+#ifndef HAVE_RB_HASH_FOREACH
+ struct RArray *keys;
+ long i;
+#endif
+
+ props = rb_funcall (self, id_to_eet_properties, 0);
+
+ if (rb_obj_is_kind_of (props, rb_cHash) == Qfalse ||
+ !RHASH (props)->tbl->num_entries)
+ rb_raise (ePropError, "invalid EET properties");
+
+ name = rb_funcall (self, id_to_eet_name, 0);
+ StringValue (name);
+
+ if (!RSTRING (name)->len ||
+ rb_funcall (name, id_include, 1, INT2FIX (0)))
+ rb_raise (eNameError, "invalid EET name");
+
+ stream = rb_class_new_instance (0, NULL, cStream);
+
+#ifdef HAVE_RB_HASH_FOREACH
+ rb_hash_foreach (props, for_each_prop, stream);
+#else
+ keys = RARRAY (rb_funcall (props, id_keys, 0));
+
+ for (i = 0; i < keys->len; i++)
+ for_each_prop (keys->ptr[i],
+ rb_hash_aref (props, keys->ptr[i]),
+ stream);
+#endif
+
+ args[0] = name;
+ args[1] = rb_ary_to_s (stream);
+
+ rb_ary_clear (stream); /* give the GC a hand... */
+
+ chunk = rb_class_new_instance (2, args, cChunk);
+
+ return rb_funcall (chunk, id_to_s, 0);
+}
+
+static VALUE
+int_to_eet_chunks (int argc, VALUE *argv, VALUE self)
+{
+ VALUE tag, type = Qnil, ary, args[2], chunk;
+ char *cfmt = "V";
+
+ rb_scan_args (argc, argv, "11", &tag, &type);
+
+ ary = rb_ary_new3 (1, self);
+
+ if (type == sym_char)
+ cfmt = "c";
+ else if (type == sym_short)
+ cfmt = "v";
+ else if (type == sym_long_long)
+ cfmt = "q";
+
+ args[0] = tag;
+ args[1] = rb_funcall (ary, id_pack, 1, rb_str_new2 (cfmt));
+ chunk = rb_class_new_instance (2, args, cChunk);
+
+ return rb_ary_new3 (1, chunk);
+}
+
+static VALUE
+float_to_eet_chunks (int argc, VALUE *argv, VALUE self)
+{
+ VALUE tag, type = Qnil, args[2], chunk;
+ char buf[65], *loc;
+ double d;
+ int len;
+
+ rb_scan_args (argc, argv, "11", &tag, &type);
+
+ d = NUM2DBL (self);
+
+ /* switch locale to make sure we get proper snprintf output */
+ loc = setlocale (LC_NUMERIC, "C");
+
+ len = snprintf (buf, sizeof (buf) - 1, "%a",
+ type == sym_double ? d : (float) d);
+
+ if (loc)
+ setlocale (LC_NUMERIC, loc);
+
+ buf[++len] = '\0';
+
+ args[0] = tag;
+ args[1] = rb_str_new (buf, len);
+ chunk = rb_class_new_instance (2, args, cChunk);
+
+ return rb_ary_new3 (1, chunk);
+}
+