Utils.h

00001 /*
00002 Copyright (c) 2011, Senio Networks, Inc.
00003 
00004 Permission is hereby granted, free of charge, to any person obtaining a copy
00005 of this software and associated documentation files (the "Software"), to deal
00006 in the Software without restriction, including without limitation the rights
00007 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00008 copies of the Software, and to permit persons to whom the Software is
00009 furnished to do so, subject to the following conditions:
00010 
00011 The above copyright notice and this permission notice shall be included in
00012 all copies or substantial portions of the Software.
00013 
00014 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00015 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00016 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00017 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00018 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00019 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
00020 THE SOFTWARE.
00021 */
00022 
00023 #ifndef UTILS_H
00024 #define UTILS_H
00025 
00026 #include "mbed.h"
00027 #include <ctype.h>
00028 #include <stdarg.h>
00029 
00030 /**
00031  * Utility functions
00032  */
00033 class Utils {
00034 public:
00035     /**
00036      * encodes string in percent encoding
00037      *
00038      * @param s source string
00039      * @param t encoded string
00040      */
00041     static int encodeFormUrl(char *s, char *t) {
00042         char *head = t;
00043         for (char c; (c = *s) != 0; s++)
00044             switch (c) {
00045                 case '\r':
00046                     break;
00047                 case ' ' :
00048                     *t++ = '+';
00049                     break;
00050                 default:
00051                     t += sprintf(t, isalnum(c) ? "%c" : (c == '\n') ? "\r%c" : "%%%02X", c);
00052             }
00053         *t = '\0';
00054         return t - head;
00055     }
00056 
00057     /**
00058      * encodes data to BASE64 string
00059      *
00060      * @param ibuf input buffer
00061      * @param length length of the input data
00062      * @param obuf output buffer
00063      */
00064     static void encodeBase64(char ibuf[], int length, char *obuf) {
00065         const char BASE64[] =
00066             "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
00067         int i, j;
00068         for (i = j = 0; j < length; j += 3, i += 4) {
00069             long a = ibuf[j] << 16 |
00070                      (j + 1 < length ? ibuf[j + 1] << 8 : 0) |
00071                      (j + 2 < length ? ibuf[j + 2] : 0);
00072             for (int k = 3; k >= 0; k--, a >>= 6)
00073                 obuf[i + k] = (j + k - 1) < length ? BASE64[a & 63] : '=';
00074         }
00075         obuf[i] = '\0';
00076     }
00077 
00078     /**
00079      * encodes string to BASE64 string
00080      * @param ibuf input string buffer
00081      * @param obuf output buffer
00082      */
00083     static void encodeBase64(char *ibuf, char *obuf) {
00084         encodeBase64(ibuf, strlen(ibuf), obuf);
00085     }
00086 
00087     /**
00088      * gets values from a file according to the specified pattern format
00089      *
00090      * @param fp pointer to the input FILE
00091      * @param pattern scanf format string, followed by variables to store the retrieved data
00092      */
00093     static bool fgetValues(FILE *fp, const char *pattern, ...) {
00094         va_list argv;
00095         va_start(argv, pattern);
00096 
00097         rewind(fp);
00098         while (!feof(fp)) {
00099             char buf[128];
00100             fgets(buf, sizeof(buf) - 1, fp);
00101             int ret = vsscanf(buf, pattern, argv);
00102             if (ret > 0) {
00103                 return true;
00104             }
00105         }
00106         return false;
00107     }
00108 };
00109 #endif