3 /* gras/datadesc.h - Describing the data you want to exchange */
5 /* Authors: Martin Quinson */
6 /* Copyright (C) 2003, 2004 Martin Quinson. */
8 /* This program is free software; you can redistribute it and/or modify it
9 under the terms of the license (GNU LGPL) which comes with this package. */
11 #ifndef GRAS_DATADESC_H
12 #define GRAS_DATADESC_H
14 #include <stddef.h> /* offsetof() */
15 #include <sys/types.h> /* size_t */
19 /*! C++ users need love */
22 # define BEGIN_DECL extern "C" {
28 /*! C++ users need love */
36 /* End of cruft for C++ */
42 typedef struct s_gras_datadesc_type gras_datadesc_type_t;
44 /* callbacks prototypes */
45 typedef void (*gras_datadesc_type_cb_void_t)(void *vars,
46 gras_datadesc_type_t *p_type,
48 typedef int (*gras_datadesc_type_cb_int_t)(void *vars,
49 gras_datadesc_type_t *p_type,
52 /***********************************************
53 **** Search and retrieve declared datatype ****
54 ***********************************************/
55 gras_datadesc_type_t *gras_datadesc_by_name(const char *name);
57 /******************************************
58 **** Declare datadescription yourself ****
59 ******************************************/
62 gras_datadesc_declare_struct(const char *name,
63 gras_datadesc_type_t **dst);
65 gras_datadesc_declare_struct_append(gras_datadesc_type_t *struct_type,
67 gras_datadesc_type_t *field_type);
69 gras_datadesc_declare_struct_close(gras_datadesc_type_t *struct_type);
71 gras_datadesc_declare_union(const char *name,
72 gras_datadesc_type_cb_int_t selector,
73 gras_datadesc_type_t **dst);
75 gras_datadesc_declare_union_append(gras_datadesc_type_t *union_type,
77 gras_datadesc_type_t *field_type);
79 gras_datadesc_declare_union_close(gras_datadesc_type_t *union_type);
81 gras_datadesc_declare_ref(const char *name,
82 gras_datadesc_type_t *referenced_type,
83 gras_datadesc_type_t **dst);
85 gras_datadesc_declare_ref_generic(const char *name,
86 gras_datadesc_type_cb_int_t discriminant,
87 gras_datadesc_type_t **dst);
89 gras_datadesc_declare_array_fixed(const char *name,
90 gras_datadesc_type_t *element_type,
92 gras_datadesc_type_t **dst);
94 gras_datadesc_declare_array_dyn(const char *name,
95 gras_datadesc_type_t *element_type,
96 gras_datadesc_type_cb_int_t dynamic_size,
97 gras_datadesc_type_t **dst);
99 /*********************************
100 * Change stuff within datadescs *
101 *********************************/
103 typedef struct s_gras_dd_cbps gras_dd_cbps_t;
104 void gras_datadesc_cb_set_pre (gras_datadesc_type_t *type,
105 gras_datadesc_type_cb_void_t pre);
106 void gras_datadesc_cb_set_post(gras_datadesc_type_t *type,
107 gras_datadesc_type_cb_void_t post);
109 /******************************
110 * Get stuff within datadescs *
111 ******************************/
112 char * gras_datadesc_get_name(gras_datadesc_type_t *ddt);
113 int gras_datadesc_get_id(gras_datadesc_type_t *ddt);
115 /********************************************************
116 * Advanced data describing: callback persistent states *
117 ********************************************************/
120 gras_dd_cbps_pop (gras_dd_cbps_t *ps,
122 gras_datadesc_type_t **ddt);
124 gras_dd_cbps_push(gras_dd_cbps_t *ps,
127 gras_datadesc_type_t *ddt);
129 gras_dd_cbps_set (gras_dd_cbps_t *ps,
132 gras_datadesc_type_t *ddt);
135 gras_dd_cbps_get (gras_dd_cbps_t *ps,
137 gras_datadesc_type_t **ddt);
140 gras_dd_cbps_block_begin(gras_dd_cbps_t *ps);
142 gras_dd_cbps_block_end(gras_dd_cbps_t *ps);
147 /*******************************
148 **** About data convertion ****
149 *******************************/
150 int gras_arch_selfid(void); /* ID of this arch */
152 /****************************
153 **** Parse C statements ****
154 ****************************/
155 gras_datadesc_type_t *
156 gras_datadesc_parse(const char *name,
157 const char *Cdefinition);
158 #define GRAS_DEFINE_TYPE(name,def) \
159 static const char * _gras_this_type_symbol_does_not_exist__##name=#def; def
161 #define gras_datadesc_by_symbol(name) \
162 (gras_datadesc_by_name(#name) ? \
163 gras_datadesc_by_name(#name) : \
164 gras_datadesc_parse(#name, \
165 _gras_this_type_symbol_does_not_exist__##name) \
168 /*****************************
169 **** NWS datadescription ****
170 *****************************/
173 * Basic types we can embeed in DataDescriptors.
176 {CHAR_TYPE, DOUBLE_TYPE, FLOAT_TYPE, INT_TYPE, LONG_TYPE, SHORT_TYPE,
177 UNSIGNED_INT_TYPE, UNSIGNED_LONG_TYPE, UNSIGNED_SHORT_TYPE, STRUCT_TYPE}
179 #define SIMPLE_TYPE_COUNT 9
181 /*! \brief Describe a collection of data.
183 ** A description of a collection of #type# data. #repetitions# is used only
184 ** for arrays; it contains the number of elements. #offset# is used only for
185 ** struct members in host format; it contains the offset of the member from the
186 ** beginning of the struct, taking into account internal padding added by the
187 ** compiler for alignment purposes. #members#, #length#, and #tailPadding# are
188 ** used only for STRUCT_TYPE data; the #length#-long array #members# describes
189 ** the members of the nested struct, and #tailPadding# indicates how many
190 ** padding bytes the compiler adds to the end of the structure.
193 typedef struct DataDescriptorStruct {
197 /*@null@*/ struct DataDescriptorStruct *members;
201 /** DataDescriptor for an array */
202 #define SIMPLE_DATA(type,repetitions) \
203 {type, repetitions, 0, NULL, 0, 0}
204 /** DataDescriptor for an structure member */
205 #define SIMPLE_MEMBER(type,repetitions,offset) \
206 {type, repetitions, offset, NULL, 0, 0}
207 /** DataDescriptor for padding bytes */
208 #define PAD_BYTES(structType,lastMember,memberType,repetitions) \
209 sizeof(structType) - offsetof(structType, lastMember) - \
210 sizeof(memberType) * repetitions
213 gras_datadesc_import_nws(const char *name,
214 const DataDescriptor *desc,
216 gras_datadesc_type_t **dst);
220 #endif /* GRAS_DATADESC_H */