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authormarha <marha@users.sourceforge.net>2012-06-08 09:33:13 +0200
committermarha <marha@users.sourceforge.net>2012-06-08 09:33:13 +0200
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-
-XKB introduces several uncommon data structures:
- - switch allows conditional inclusion of fields
- - several complex objects intermix variable and fixed size fields
- - lists with a variable number of variable size objects
-
-To handle these objects, a number of new functions is generated:
- - _serialize() turns a structured object into a byte stream,
- (re)ordering or including fields according to the protocol
- - _unserialize() rewrites data from a buffer into a structured object
- - _unpack() expands a buffer representing a switch object into
- a special structured type, all flags needed to resolve the switch
- expression have to given as parameters
- - _sizeof() calculates the size of a serialized object, often by calling
- _unserialize()/_unpack() internally
-
-The new structured data type for switch is special as it contains fixed
-and variable size fields. Variable size fields can be accessed via pointers.
-
-If switch appears in a request, an additional set of request helpers is
-generated with the suffix _aux or _aux_(un)checked. While the 'common'
-request functions require that switch has been serialized before, the _aux
-variants take the structured data type. They are especially designed to
-replace certain functions in xcb-util/aux.
-
-Accessors for switch members need two parameters, where the first is usually
-a pointer to the respective request or reply structure, while the second
-is a pointer to the unpacked switch data structure.
-
-Functions from the serialize family that take a double pointer can allocate
-memory on their own, which is useful if the size of a buffer has to be
-calculated depending on the data within. These functions call malloc() when
-the double pointer is given as the address of a pointer that has been
-initialized to 0. It is the responsibility of the user to free any allocated
-memory.
-
-Intermixed variable and fixed size fields are an important special case in XKB.
-The current implementation resolves the issue by reordering the fields before
-sending them on the wire as well as before returning a reply. That means that
-these objects look like 'common' XCB data types and they can be accessed as such
-(i.e. fixed size fields directly via the structured type and variable size fields
-via accessors/iterators).
-
-In case a list with variable size elements needs to be accessed, it is necessary
-to use iterators. The iterator functions take care of determining the actual
-object size for each element automatically.
-
-A small and preliminary set of auxiliary functions is available in xkb_util.c
-in the check_xkb module.
+
+XKB introduces several uncommon data structures:
+ - switch allows conditional inclusion of fields
+ - several complex objects intermix variable and fixed size fields
+ - lists with a variable number of variable size objects
+
+To handle these objects, a number of new functions is generated:
+ - _serialize() turns a structured object into a byte stream,
+ (re)ordering or including fields according to the protocol
+ - _unserialize() rewrites data from a buffer into a structured object
+ - _unpack() expands a buffer representing a switch object into
+ a special structured type, all flags needed to resolve the switch
+ expression have to given as parameters
+ - _sizeof() calculates the size of a serialized object, often by calling
+ _unserialize()/_unpack() internally
+
+The new structured data type for switch is special as it contains fixed
+and variable size fields. Variable size fields can be accessed via pointers.
+
+If switch appears in a request, an additional set of request helpers is
+generated with the suffix _aux or _aux_(un)checked. While the 'common'
+request functions require that switch has been serialized before, the _aux
+variants take the structured data type. They are especially designed to
+replace certain functions in xcb-util/aux.
+
+Accessors for switch members need two parameters, where the first is usually
+a pointer to the respective request or reply structure, while the second
+is a pointer to the unpacked switch data structure.
+
+Functions from the serialize family that take a double pointer can allocate
+memory on their own, which is useful if the size of a buffer has to be
+calculated depending on the data within. These functions call malloc() when
+the double pointer is given as the address of a pointer that has been
+initialized to 0. It is the responsibility of the user to free any allocated
+memory.
+
+Intermixed variable and fixed size fields are an important special case in XKB.
+The current implementation resolves the issue by reordering the fields before
+sending them on the wire as well as before returning a reply. That means that
+these objects look like 'common' XCB data types and they can be accessed as such
+(i.e. fixed size fields directly via the structured type and variable size fields
+via accessors/iterators).
+
+In case a list with variable size elements needs to be accessed, it is necessary
+to use iterators. The iterator functions take care of determining the actual
+object size for each element automatically.
+
+A small and preliminary set of auxiliary functions is available in xkb_util.c
+in the check_xkb module.