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  1. /*
  2.  * Copyright (c) 2008 Lukas Mejdrech
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup net
  30.  *  @{
  31.  */
  32.  
  33. /** @file
  34.  *  A character string with measured length header file.
  35.  *  This structure has been designed for serialization of character strings between modules.
  36.  */
  37.  
  38. #ifndef __MEASURED_STRINGS_H__
  39. #define __MEASURED_STRINGS_H__
  40.  
  41. /** A type definition of a character string with measured length.
  42.  *  @see measured_string
  43.  */
  44. typedef struct measured_string  measured_string_t;
  45.  
  46. /** A type definition of a character string with measured length pointer.
  47.  *  @see measured_string
  48.  */
  49. typedef measured_string_t *     measured_string_ref;
  50.  
  51. /** A character string with measured length.
  52.  *  This structure has been designed for serialization of character strings between modules.
  53.  */
  54. struct  measured_string{
  55.  
  56.     /** The character string data.
  57.      */
  58.     char *  value;
  59.  
  60.     /** The character string length.
  61.      */
  62.     size_t  length;
  63. };
  64.  
  65. /** Creates a new measured string bundled with a copy of the given string itself as one memory block.
  66.  *  If the measured string is being freed, whole memory block is freed.
  67.  *  The measured string should be used only as a constant.
  68.  *  @param string The initial character string to be stored. Input parameter.
  69.  *  @param length The length of the given string without the terminating zero ('/0') character. If the length is zero (0), the actual length is computed. The given length is used and appended with the terminating zero ('\0') character otherwise. Input parameter.
  70.  *  @returns The new bundled charecter string with measured length.
  71.  *  @returns NULL if there is no memory left.
  72.  */
  73. measured_string_ref measured_string_create_bulk( const char * string, size_t length );
  74.  
  75. /** Receives a measured strings array from a calling module.
  76.  *  Creates the array and the data memory blocks.
  77.  *  This method should be used only while processing IPC messages as the array size has to be negotiated in advance.
  78.  *  @param strings The received measured strings array. Output parameter.
  79.  *  @param data The measured strings data. This memory block stores the actual character strings. Output parameter.
  80.  *  @param count The size of the measured strings array. Input parameter.
  81.  *  @returns EOK on success.
  82.  *  @returns EINVAL if the strings or data parameter is NULL.
  83.  *  @returns EINVAL if the count parameter is zero (0).
  84.  *  @returns EINVAL if the sent array differs in size.
  85.  *  @returns EINVAL if there is inconsistency in sent measured strings' lengths (should not occur).
  86.  *  @returns ENOMEM if there is no memory left.
  87.  *  @returns Other error codes as defined for the ipc_data_write_finalize() function.
  88.  */
  89. int measured_strings_receive( measured_string_ref * strings, char ** data, size_t count );
  90.  
  91. /** Replies the given measured strings array to a calling module.
  92.  *  This method should be used only while processing IPC messages as the array size has to be negotiated in advance.
  93.  *  @param strings The measured strings array to be transferred. Input parameter.
  94.  *  @param count The measured strings array size. Input parameter.
  95.  *  @returns EOK on success.
  96.  *  @returns EINVAL if the strings parameter is NULL.
  97.  *  @returns EINVAL if the count parameter is zero (0).
  98.  *  @returns EINVAL if the calling module does not accept the given array size.
  99.  *  @returns EINVAL if there is inconsistency in sent measured strings' lengths (should not occur).
  100.  *  @returns Other error codes as defined for the ipc_data_read_finalize() function.
  101.  */
  102. int measured_strings_reply( const measured_string_ref strings, size_t count );
  103.  
  104. /** Receives a measured strings array from another module.
  105.  *  Creates the array and the data memory blocks.
  106.  *  This method should be used only following other IPC messages as the array size has to be negotiated in advance.
  107.  *  @param phone The other module phone. Input parameter.
  108.  *  @param strings The returned measured strings array. Output parameter.
  109.  *  @param data The measured strings data. This memory block stores the actual character strings. Output parameter.
  110.  *  @param count The size of the measured strings array. Input parameter.
  111.  *  @returns EOK on success.
  112.  *  @returns EINVAL if the strings or data parameter is NULL.
  113.  *  @returns EINVAL if the phone or count parameter is not positive (<=0).
  114.  *  @returns EINVAL if the sent array differs in size.
  115.  *  @returns ENOMEM if there is no memory left.
  116.  *  @returns Other error codes as defined for the ipc_data_read_start() function.
  117.  */
  118. int measured_strings_return( int phone, measured_string_ref * strings, char ** data, size_t count );
  119.  
  120. /** Sends the given measured strings array to another module.
  121.  *  This method should be used only following other IPC messages as the array size has to be negotiated in advance.
  122.  *  @param phone The other module phone. Input parameter.
  123.  *  @param strings The measured strings array to be transferred. Input parameter.
  124.  *  @param count The measured strings array size. Input parameter.
  125.  *  @returns EOK on success.
  126.  *  @returns EINVAL if the strings parameter is NULL.
  127.  *  @returns EINVAL if the phone or count parameter is not positive (<=0).
  128.  *  @returns Other error codes as defined for the ipc_data_write_start() function.
  129.  */
  130. int measured_strings_send( int phone, const measured_string_ref strings, size_t count );
  131.  
  132. #endif
  133.  
  134. /** @}
  135.  */
  136.  
  137.