Wed Aug 18 22:33:52 2010

Asterisk developer's documentation


func_base64.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 2005 - 2006, Digium, Inc.
00005  * Copyright (C) 2005, Claude Patry
00006  *
00007  * See http://www.asterisk.org for more information about
00008  * the Asterisk project. Please do not directly contact
00009  * any of the maintainers of this project for assistance;
00010  * the project provides a web site, mailing lists and IRC
00011  * channels for your use.
00012  *
00013  * This program is free software, distributed under the terms of
00014  * the GNU General Public License Version 2. See the LICENSE file
00015  * at the top of the source tree.
00016  */
00017 
00018 /*! \file
00019  *
00020  * \brief Use the base64 as functions
00021  * 
00022  * \ingroup functions
00023  */
00024 
00025 #include "asterisk.h"
00026 
00027 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 228650 $")
00028 
00029 #include "asterisk/module.h"
00030 #include "asterisk/pbx.h"  /* function register/unregister */
00031 #include "asterisk/utils.h"
00032 
00033 static int base64_encode(struct ast_channel *chan, const char *cmd, char *data,
00034           char *buf, size_t len)
00035 {
00036    if (ast_strlen_zero(data)) {
00037       ast_log(LOG_WARNING, "Syntax: BASE64_ENCODE(<data>) - missing argument!\n");
00038       return -1;
00039    }
00040 
00041    ast_base64encode(buf, (unsigned char *) data, strlen(data), len);
00042 
00043    return 0;
00044 }
00045 
00046 static int base64_decode(struct ast_channel *chan, const char *cmd, char *data,
00047           char *buf, size_t len)
00048 {
00049    int decoded_len;
00050 
00051    if (ast_strlen_zero(data)) {
00052       ast_log(LOG_WARNING, "Syntax: BASE64_DECODE(<base_64 string>) - missing argument!\n");
00053       return -1;
00054    }
00055 
00056    decoded_len = ast_base64decode((unsigned char *) buf, data, len);
00057    if (decoded_len <= (len - 1)) {     /* if not truncated, */
00058       buf[decoded_len] = '\0';
00059    } else {
00060       buf[len - 1] = '\0';
00061    }
00062 
00063    return 0;
00064 }
00065 
00066 static struct ast_custom_function base64_encode_function = {
00067    .name = "BASE64_ENCODE",
00068    .synopsis = "Encode a string in base64",
00069    .desc = "Returns the base64 string\n",
00070    .syntax = "BASE64_ENCODE(<string>)",
00071    .read = base64_encode,
00072 };
00073 
00074 static struct ast_custom_function base64_decode_function = {
00075    .name = "BASE64_DECODE",
00076    .synopsis = "Decode a base64 string",
00077    .desc = "Returns the plain text string\n",
00078    .syntax = "BASE64_DECODE(<base64_string>)",
00079    .read = base64_decode,
00080 };
00081 
00082 static int unload_module(void)
00083 {
00084    return ast_custom_function_unregister(&base64_encode_function) |
00085       ast_custom_function_unregister(&base64_decode_function);
00086 }
00087 
00088 static int load_module(void)
00089 {
00090    return ast_custom_function_register(&base64_encode_function) |
00091       ast_custom_function_register(&base64_decode_function);
00092 }
00093 
00094 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "base64 encode/decode dialplan functions");

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