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+/****************************************************************************
+ * apps/include/netutils/base64.h
+ *
+ * This file is part of the NuttX RTOS:
+ *
+ * Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ * Author: Darcy Gong
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+#include <apps/netutils/urldecode.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#ifdef CONFIG_CODECS_URLCODE
+# define IS_HEX_CHAR(ch) \
+ ((ch >= '0' && ch <= '9') || \
+ (ch >= 'a' && ch <= 'f') || \
+ (ch >= 'A' && ch <= 'F'))
+
+# define HEX_VALUE(ch, value) \
+ if (ch >= '0' && ch <= '9') \
+ { \
+ value = ch - '0'; \
+ } \
+ else if (ch >= 'a' && ch <= 'f') \
+ { \
+ value = ch - 'a' + 10; \
+ } \
+ else \
+ { \
+ value = ch - 'A' + 10; \
+ }
+#endif
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: from_hex
+ *
+ * Description:
+ * Converts a hex character to its integer value,
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_CODECS_URLCODE_NEWMEMORY
+static char from_hex(char ch)
+{
+ return isdigit(ch) ? ch - '0' : tolower(ch) - 'a' + 10;
+}
+#endif
+
+/****************************************************************************
+ * Name:
+ *
+ * Description:
+ * Converts an integer value to its hex character,
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_CODECS_URLCODE_NEWMEMORY
+static char to_hex(char code)
+{
+ static const char hex[] = "0123456789abcdef";
+ return hex[code & 15];
+}
+#endif
+
+/****************************************************************************
+ * Name: int2h
+ *
+ * Description:
+ * Convert a single character to a 2 digit hex str a terminating '\0' is
+ * added
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_CODECS_AVR_URLCODE
+static void int2h(char c, char *hstr)
+{
+ hstr[1] = (c & 0xf) + '0';
+ if ((c & 0xf) > 9)
+ {
+ hstr[1] = (c & 0xf) - 10 + 'a';
+ }
+
+ c = (c >> 4) & 0xf;
+ hstr[0] = c + '0';
+ if (c > 9)
+ {
+ hstr[0] = c - 10 + 'a';
+ }
+
+ hstr[2] = '\0';
+}
+#endif
+
+/****************************************************************************
+ * Name: h2int
+ *
+ * Description:
+ * Convert a single hex digit character to its integer value.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_CODECS_AVR_URLCODE
+static unsigned char h2int(char c)
+{
+ if (c >= '0' && c <= '9')
+ {
+ return ((unsigned char)c - '0');
+ }
+
+ if (c >= 'a' && c <= 'f')
+ {
+ return ((unsigned char)c - 'a' + 10);
+ }
+
+ if (c >= 'A' && c <= 'F')
+ {
+ return ((unsigned char)c - 'A' + 10);
+ }
+
+ return 0;
+}
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name:
+ *
+ * Description:
+ * Returns a url-encoded version of str.
+ *
+ * IMPORTANT: be sure to free() the returned string after use.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_CODECS_URLCODE_NEWMEMORY
+char *url_encode(char *str)
+{
+ char *pstr = str;
+ char *buf = malloc(strlen(str) * 3 + 1);
+ char *pbuf = buf;
+
+ while (*pstr)
+ {
+ if (isalnum(*pstr) || *pstr == '-' || *pstr == '_' || *pstr == '.' || *pstr == '~')
+ {
+ *pbuf++ = *pstr;
+ }
+ else if (*pstr == ' ')
+ {
+ *pbuf++ = '+';
+ }
+ else
+ {
+ *pbuf++ = '%';
+ *pbuf++ = to_hex(*pstr >> 4);
+ *pbuf++ = to_hex(*pstr & 15);
+ }
+
+ pstr++;
+ }
+
+ *pbuf = '\0';
+ return buf;
+}
+#endif
+
+/****************************************************************************
+ * Name: url_decode
+ *
+ * Description:
+ * Returns a url-decoded version of str.
+ *
+ * IMPORTANT: be sure to free() the returned string after use.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_CODECS_URLCODE_NEWMEMORY
+char *url_decode(char *str)
+{
+ char *pstr = str;
+ char *buf = malloc(strlen(str) + 1);
+ char *pbuf = buf;
+
+ while (*pstr)
+ {
+ if (*pstr == '%')
+ {
+ if (pstr[1] && pstr[2])
+ {
+ *pbuf++ = from_hex(pstr[1]) << 4 | from_hex(pstr[2]);
+ pstr += 2;
+ }
+ }
+ else if (*pstr == '+')
+ {
+ *pbuf++ = ' ';
+ }
+ else
+ {
+ *pbuf++ = *pstr;
+ }
+
+ pstr++;
+ }
+
+ *pbuf = '\0';
+ return buf;
+}
+#endif
+
+/****************************************************************************
+ * Name: urlencode
+ ****************************************************************************/
+
+#ifdef CONFIG_CODECS_URLCODE
+char *urlencode(const char *src, const int src_len, char *dest, int *dest_len)
+{
+ static const unsigned char hex_chars[] = "0123456789ABCDEF";
+ const unsigned char *pSrc;
+ const unsigned char *pEnd;
+ char *pDest;
+
+ pDest = dest;
+ pEnd = (unsigned char *)src + src_len;
+ for (pSrc = (unsigned char *)src; pSrc < pEnd; pSrc++)
+ {
+ if ((*pSrc >= '0' && *pSrc <= '9') ||
+ (*pSrc >= 'a' && *pSrc <= 'z') ||
+ (*pSrc >= 'A' && *pSrc <= 'Z') ||
+ (*pSrc == '_' || *pSrc == '-' || *pSrc == '.' || *pSrc == '~'))
+ {
+ *pDest++ = *pSrc;
+ }
+ else if (*pSrc == ' ')
+ {
+ *pDest++ = '+';
+ }
+ else
+ {
+ *pDest++ = '%';
+ *pDest++ = hex_chars[(*pSrc) >> 4];
+ *pDest++ = hex_chars[(*pSrc) & 0x0F];
+ }
+ }
+
+ *pDest = '\0';
+ *dest_len = pDest - dest;
+ return dest;
+}
+#endif
+
+/****************************************************************************
+ * Name: urldecode
+ ****************************************************************************/
+
+#ifdef CONFIG_CODECS_URLCODE
+char *urldecode(const char *src, const int src_len, char *dest, int *dest_len)
+{
+ const unsigned char *pSrc;
+ const unsigned char *pEnd;
+ char *pDest;
+ unsigned char cHigh;
+ unsigned char cLow;
+ int valHigh;
+ int valLow;
+
+ pDest = dest;
+ pSrc = (unsigned char *)src;
+ pEnd = (unsigned char *)src + src_len;
+ while (pSrc < pEnd)
+ {
+ if (*pSrc == '%' && pSrc + 2 < pEnd)
+ {
+ cHigh = *(pSrc + 1);
+ cLow = *(pSrc + 2);
+
+ if (IS_HEX_CHAR(cHigh) && IS_HEX_CHAR(cLow))
+ {
+ HEX_VALUE(cHigh, valHigh)
+ HEX_VALUE(cLow, valLow)
+ *pDest++ = (valHigh << 4) | valLow;
+ pSrc += 3;
+ }
+ else
+ {
+ *pDest++ = *pSrc;
+ pSrc++;
+ }
+ }
+ else if (*pSrc == '+')
+ {
+ *pDest++ = ' ';
+ pSrc++;
+ }
+ else
+ {
+ *pDest++ = *pSrc;
+ pSrc++;
+ }
+ }
+
+ *pDest = '\0';
+ *dest_len = pDest - dest;
+ return dest;
+}
+#endif
+
+/****************************************************************************
+ * Name: urlrawdecode
+ *
+ * Description:
+ * decode a url string e.g "hello%20joe" or "hello+joe" becomes "hello joe"
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_CODECS_AVR_URLCODE
+void urlrawdecode(char *urlbuf)
+{
+ char c;
+ char *dst;
+ dst = urlbuf;
+ while ((c = *urlbuf))
+ {
+ if (c == '+')
+ {
+ c = ' ';
+ }
+
+ if (c == '%')
+ {
+ urlbuf++;
+ c = *urlbuf;
+ urlbuf++;
+ c = (h2int(c) << 4) | h2int(*urlbuf);
+ }
+
+ *dst = c;
+ dst++;
+ urlbuf++;
+ }
+
+ *dst = '\0';
+}
+#endif
+
+/****************************************************************************
+ * Name: urlrawencode
+ *
+ * Description:
+ * There must be enoug space in urlbuf. In the worst case that is 3 times
+ * the length of str
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_CODECS_AVR_URLCODE
+void urlrawencode(char *str, char *urlbuf)
+{
+ char c;
+ while ((c = *str))
+ {
+ if (c == ' ' || isalnum(c) || c == '_' || c == '-' || c == '.' || c == '~')
+ {
+ if (c == ' ')
+ {
+ c = '+';
+ }
+
+ *urlbuf = c;
+ str++;
+ urlbuf++;
+ continue;
+ }
+
+ *urlbuf = '%';
+ urlbuf++;
+ int2h(c, urlbuf);
+ urlbuf++;
+ urlbuf++;
+ str++;
+ }
+
+ *urlbuf = '\0';
+}
+#endif
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