dbus/dbus-marshal-recursive.h

   1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
   2 /* dbus-marshal-recursive.h  Marshalling routines for recursive types
   3  *
   4  * Copyright (C) 2004, 2005 Red Hat, Inc.
   5  *
   6  * Licensed under the Academic Free License version 2.1
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  21  *
  22  */
  23
  24 #ifndef DBUS_MARSHAL_RECURSIVE_H
  25 #define DBUS_MARSHAL_RECURSIVE_H
  26
  27 #include <config.h>
  28 #include <dbus/dbus-protocol.h>
  29 #include <dbus/dbus-list.h>
  30
  31 typedef struct DBusTypeReader      DBusTypeReader;
  32 typedef struct DBusTypeWriter      DBusTypeWriter;
  33 typedef struct DBusTypeReaderClass DBusTypeReaderClass;
  34 typedef struct DBusArrayLenFixup   DBusArrayLenFixup;
  35
  36 /**
  37  * The type reader is an iterator for reading values from a block of
  38  * values.
  39  */
  40 struct DBusTypeReader
  41 {
  42   dbus_uint32_t byte_order : 8; /**< byte order of the block */
  43
  44   dbus_uint32_t finished : 1;   /**< marks we're at end iterator for cases
  45                                  * where we don't have another way to tell
  46                                  */
  47   dbus_uint32_t array_len_offset : 3; /**< bytes back from start_pos that len ends */
  48   const DBusString *type_str;   /**< string containing signature of block */
  49   int type_pos;                 /**< current position in signature */
  50   const DBusString *value_str;  /**< string containing values of block */
  51   int value_pos;                /**< current position in values */
  52
  53   const DBusTypeReaderClass *klass; /**< the vtable for the reader */
  54   union
  55   {
  56     struct {
  57       int start_pos;                /**< for array readers, the start of the array values */
  58     } array;
  59   } u; /**< class-specific data */
  60 };
  61
  62 /**
  63  * The type writer is an iterator for writing to a block of values.
  64  */
  65 struct DBusTypeWriter
  66 {
  67   dbus_uint32_t byte_order : 8;            /**< byte order to write values with */
  68
  69   dbus_uint32_t container_type : 8;        /**< what are we inside? (e.g. struct, variant, array) */
  70
  71   dbus_uint32_t type_pos_is_expectation : 1; /**< type_pos can be either an insertion point for or an expected next type */
  72
  73   dbus_uint32_t enabled : 1; /**< whether to write values */
  74
  75   DBusString *type_str; /**< where to write typecodes (or read type expectations) */
  76   int type_pos;         /**< current pos in type_str */
  77   DBusString *value_str; /**< where to write values */
  78   int value_pos;         /**< next position to write */
  79
  80   union
  81   {
  82     struct {
  83       int start_pos; /**< position of first element in the array */
  84       int len_pos;   /**< position of length of the array */
  85       int element_type_pos; /**< position of array element type in type_str */
  86     } array;
  87   } u; /**< class-specific data */
  88 };
  89
  90 /**
  91  * When modifying an existing block of values, array lengths may need
  92  * to be adjusted; those adjustments are described by this struct.
  93  */
  94 struct DBusArrayLenFixup
  95 {
  96   int len_pos_in_reader; /**< where the length was in the original block */
  97   int new_len;           /**< the new value of the length in the written-out block */
  98 };
  99
 100 void        _dbus_type_reader_init                      (DBusTypeReader        *reader,
 101                                                          int                    byte_order,
 102                                                          const DBusString      *type_str,
 103                                                          int                    type_pos,
 104                                                          const DBusString      *value_str,
 105                                                          int                    value_pos);
 106 void        _dbus_type_reader_init_types_only           (DBusTypeReader        *reader,
 107                                                          const DBusString      *type_str,
 108                                                          int                    type_pos);
 109 int         _dbus_type_reader_get_current_type          (const DBusTypeReader  *reader);
 110 int         _dbus_type_reader_get_element_type          (const DBusTypeReader  *reader);
 111 int         _dbus_type_reader_get_value_pos             (const DBusTypeReader  *reader);
 112 void        _dbus_type_reader_read_basic                (const DBusTypeReader  *reader,
 113                                                          void                  *value);
 114 int         _dbus_type_reader_get_array_length          (const DBusTypeReader  *reader);
 115 void        _dbus_type_reader_read_fixed_multi          (const DBusTypeReader  *reader,
 116                                                          void                  *value,
 117                                                          int                   *n_elements);
 118 void        _dbus_type_reader_read_raw                  (const DBusTypeReader  *reader,
 119                                                          const unsigned char  **value_location);
 120 void        _dbus_type_reader_recurse                   (DBusTypeReader        *reader,
 121                                                          DBusTypeReader        *subreader);
 122 dbus_bool_t _dbus_type_reader_next                      (DBusTypeReader        *reader);
 123 dbus_bool_t _dbus_type_reader_has_next                  (const DBusTypeReader  *reader);
 124 void        _dbus_type_reader_get_signature             (const DBusTypeReader  *reader,
 125                                                          const DBusString     **str_p,
 126                                                          int                   *start_p,
 127                                                          int                   *len_p);
 128 dbus_bool_t _dbus_type_reader_set_basic                 (DBusTypeReader        *reader,
 129                                                          const void            *value,
 130                                                          const DBusTypeReader  *realign_root);
 131 dbus_bool_t _dbus_type_reader_delete                    (DBusTypeReader        *reader,
 132                                                          const DBusTypeReader  *realign_root);
 133 dbus_bool_t _dbus_type_reader_greater_than              (const DBusTypeReader  *lhs,
 134                                                          const DBusTypeReader  *rhs);
 135
 136 dbus_bool_t _dbus_type_reader_equal_values              (const DBusTypeReader *lhs,
 137                                                          const DBusTypeReader *rhs);
 138
 139 void        _dbus_type_signature_next                   (const char            *signature,
 140                                                          int                   *type_pos);
 141
 142 void        _dbus_type_writer_init                 (DBusTypeWriter        *writer,
 143                                                     int                    byte_order,
 144                                                     DBusString            *type_str,
 145                                                     int                    type_pos,
 146                                                     DBusString            *value_str,
 147                                                     int                    value_pos);
 148 void        _dbus_type_writer_init_types_delayed   (DBusTypeWriter        *writer,
 149                                                     int                    byte_order,
 150                                                     DBusString            *value_str,
 151                                                     int                    value_pos);
 152 void        _dbus_type_writer_add_types            (DBusTypeWriter        *writer,
 153                                                     DBusString            *type_str,
 154                                                     int                    type_pos);
 155 void        _dbus_type_writer_remove_types         (DBusTypeWriter        *writer);
 156 void        _dbus_type_writer_init_values_only     (DBusTypeWriter        *writer,
 157                                                     int                    byte_order,
 158                                                     const DBusString      *type_str,
 159                                                     int                    type_pos,
 160                                                     DBusString            *value_str,
 161                                                     int                    value_pos);
 162 dbus_bool_t _dbus_type_writer_write_basic          (DBusTypeWriter        *writer,
 163                                                     int                    type,
 164                                                     const void            *value);
 165 dbus_bool_t _dbus_type_writer_write_fixed_multi    (DBusTypeWriter        *writer,
 166                                                     int                    element_type,
 167                                                     const void            *value,
 168                                                     int                    n_elements);
 169 dbus_bool_t _dbus_type_writer_recurse              (DBusTypeWriter        *writer,
 170                                                     int                    container_type,
 171                                                     const DBusString      *contained_type,
 172                                                     int                    contained_type_start,
 173                                                     DBusTypeWriter        *sub);
 174 dbus_bool_t _dbus_type_writer_unrecurse            (DBusTypeWriter        *writer,
 175                                                     DBusTypeWriter        *sub);
 176 dbus_bool_t _dbus_type_writer_append_array         (DBusTypeWriter        *writer,
 177                                                     const DBusString      *contained_type,
 178                                                     int                    contained_type_start,
 179                                                     DBusTypeWriter        *sub);
 180 dbus_bool_t _dbus_type_writer_write_reader         (DBusTypeWriter        *writer,
 181                                                     DBusTypeReader        *reader);
 182 dbus_bool_t _dbus_type_writer_write_reader_partial (DBusTypeWriter        *writer,
 183                                                     DBusTypeReader        *reader,
 184                                                     const DBusTypeReader  *start_after,
 185                                                     int                    start_after_new_pos,
 186                                                     int                    start_after_new_len,
 187                                                     DBusList             **fixups);
 188 void        _dbus_type_writer_set_enabled          (DBusTypeWriter        *writer,
 189                                                     dbus_bool_t            enabled);
 190
 191
 192 #endif /* DBUS_MARSHAL_RECURSIVE_H */