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GDBusMessage: Add a way to get/set byte order of a message

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Also use this in the test cases to check that serialization to and
from both big and little endian works.

Signed-off-by: David Zeuthen <davidz@redhat.com>
This commit is contained in:
David Zeuthen
2010-08-04 13:32:19 -04:00
parent 6e723e8b3e
commit 6f070be65b
6 changed files with 180 additions and 77 deletions
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85
gio/gdbusmessage.c
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@@ -99,6 +99,7 @@ struct _GDBusMessage
#ifdef G_OS_UNIX
GUnixFDList *fd_list;
#endif
GDBusMessageByteOrder byte_order;
};
G_DEFINE_TYPE (GDBusMessage, g_dbus_message, G_TYPE_OBJECT);
@@ -134,6 +135,18 @@ g_dbus_message_class_init (GDBusMessageClass *klass)
static void
g_dbus_message_init (GDBusMessage *message)
{
/* Any D-Bus implementation is supposed to handle both Big and
* Little Endian encodings and the Endianness is part of the D-Bus
* message - we prefer to use Big Endian (since it's Network Byte
* Order and just easier to read for humans) but if the machine is
* Little Endian we use that for performance reasons.
*/
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
message->byte_order = G_DBUS_MESSAGE_BYTE_ORDER_LITTLE_ENDIAN;
#else
/* this could also be G_PDP_ENDIAN */
message->byte_order = G_DBUS_MESSAGE_BYTE_ORDER_BIG_ENDIAN;
#endif
message->headers = g_hash_table_new_full (g_direct_hash,
g_direct_equal,
NULL,
@@ -255,6 +268,8 @@ g_dbus_message_new_method_reply (GDBusMessage *method_call_message)
message = g_dbus_message_new ();
message->type = G_DBUS_MESSAGE_TYPE_METHOD_RETURN;
message->flags = G_DBUS_MESSAGE_FLAGS_NO_REPLY_EXPECTED;
/* reply with same endianness */
message->byte_order = method_call_message->byte_order;
g_dbus_message_set_reply_serial (message, g_dbus_message_get_serial (method_call_message));
sender = g_dbus_message_get_sender (method_call_message);
@@ -327,6 +342,8 @@ g_dbus_message_new_method_error_literal (GDBusMessage *method_call_message,
message = g_dbus_message_new ();
message->type = G_DBUS_MESSAGE_TYPE_ERROR;
message->flags = G_DBUS_MESSAGE_FLAGS_NO_REPLY_EXPECTED;
/* reply with same endianness */
message->byte_order = method_call_message->byte_order;
g_dbus_message_set_reply_serial (message, g_dbus_message_get_serial (method_call_message));
g_dbus_message_set_error_name (message, error_name);
@@ -371,6 +388,38 @@ g_dbus_message_new_method_error_valist (GDBusMessage *method_call_me
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_message_get_byte_order:
* @message: A #GDBusMessage.
*
* Gets the byte order of @message.
*
* Returns: The byte order.
*/
GDBusMessageByteOrder
g_dbus_message_get_byte_order (GDBusMessage *message)
{
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), (GDBusMessageByteOrder) 0);
return message->byte_order;
}
/**
* g_dbus_message_set_byte_order:
* @message: A #GDBusMessage.
* @byte_order: The byte order.
*
* Sets the byte order of @message.
*/
void
g_dbus_message_set_byte_order (GDBusMessage *message,
GDBusMessageByteOrder byte_order)
{
g_return_if_fail (G_IS_DBUS_MESSAGE (message));
message->byte_order = byte_order;
}
/* ---------------------------------------------------------------------------------------------------- */
/* TODO: need GI annotations to specify that any guchar value goes for the type */
/**
@@ -1385,7 +1434,9 @@ g_dbus_message_bytes_needed (guchar *blob,
* @capabilities: A #GDBusCapabilityFlags describing what protocol features are supported.
* @error: Return location for error or %NULL.
*
* Creates a new #GDBusMessage from the data stored at @blob.
* Creates a new #GDBusMessage from the data stored at @blob. The byte
* order that the message was in can be retrieved using
* g_dbus_message_get_byte_order().
*
* Returns: A new #GDBusMessage or %NULL if @error is set. Free with
* g_object_unref().
@@ -1429,16 +1480,18 @@ g_dbus_message_new_from_blob (guchar *blob,
{
case 'l':
byte_order = G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN;
message->byte_order = G_DBUS_MESSAGE_BYTE_ORDER_LITTLE_ENDIAN;
break;
case 'B':
byte_order = G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN;
message->byte_order = G_DBUS_MESSAGE_BYTE_ORDER_BIG_ENDIAN;
break;
default:
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Invalid endianness value. Expected 'l' or 'B' but found '%c' (%d)"),
endianness, endianness);
_("Invalid endianness value. Expected 0x6c ('l') or 0x42 ('B') but found value 0x%02x"),
endianness);
goto out;
}
g_data_input_stream_set_byte_order (dis, byte_order);
@@ -1945,7 +1998,8 @@ append_body_to_blob (GVariant *value,
* @capabilities: A #GDBusCapabilityFlags describing what protocol features are supported.
* @error: Return location for error.
*
* Serializes @message to a blob.
* Serializes @message to a blob. The byte order returned by
* g_dbus_message_get_byte_order() will be used.
*
* Returns: A pointer to a valid binary D-Bus message of @out_size bytes
* generated by @message or %NULL if @error is set. Free with g_free().
@@ -1987,22 +2041,19 @@ g_dbus_message_to_blob (GDBusMessage *message,
mos = G_MEMORY_OUTPUT_STREAM (g_memory_output_stream_new (NULL, 0, g_realloc, g_free));
dos = g_data_output_stream_new (G_OUTPUT_STREAM (mos));
/* Any D-Bus implementation is supposed to handle both Big and
* Little Endian encodings and the Endianness is part of the D-Bus
* message - we prefer to use Big Endian (since it's Network Byte
* Order and just easier to read for humans) but if the machine is
* Little Endian we use that for performance reasons.
*/
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
byte_order = G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN;
#else
/* this could also be G_PDP_ENDIAN */
byte_order = G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN;
#endif
switch (message->byte_order)
{
case G_DBUS_MESSAGE_BYTE_ORDER_BIG_ENDIAN:
byte_order = G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN;
break;
case G_DBUS_MESSAGE_BYTE_ORDER_LITTLE_ENDIAN:
byte_order = G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN;
break;
}
g_data_output_stream_set_byte_order (dos, byte_order);
/* Core header */
g_data_output_stream_put_byte (dos, byte_order == G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN ? 'l' : 'B', NULL, NULL);
g_data_output_stream_put_byte (dos, (guchar) message->byte_order, NULL, NULL);
g_data_output_stream_put_byte (dos, message->type, NULL, NULL);
g_data_output_stream_put_byte (dos, message->flags, NULL, NULL);
g_data_output_stream_put_byte (dos, 1, NULL, NULL); /* major protocol version */