diff options
Diffstat (limited to 'libcurl/src/lib/escape.c')
| -rw-r--r-- | libcurl/src/lib/escape.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/libcurl/src/lib/escape.c b/libcurl/src/lib/escape.c new file mode 100644 index 0000000..417a91a --- /dev/null +++ b/libcurl/src/lib/escape.c @@ -0,0 +1,231 @@ +/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+/* Escape and unescape URL encoding in strings. The functions return a new
+ * allocated string or NULL if an error occurred. */
+
+#include "curl_setup.h"
+
+#include <curl/curl.h>
+
+#include "urldata.h"
+#include "warnless.h"
+#include "non-ascii.h"
+#include "escape.h"
+#include "curl_printf.h"
+
+/* The last #include files should be: */
+#include "curl_memory.h"
+#include "memdebug.h"
+
+/* Portable character check (remember EBCDIC). Do not use isalnum() because
+ its behavior is altered by the current locale.
+ See http://tools.ietf.org/html/rfc3986#section-2.3
+*/
+static bool Curl_isunreserved(unsigned char in)
+{
+ switch (in) {
+ case '0': case '1': case '2': case '3': case '4':
+ case '5': case '6': case '7': case '8': case '9':
+ case 'a': case 'b': case 'c': case 'd': case 'e':
+ case 'f': case 'g': case 'h': case 'i': case 'j':
+ case 'k': case 'l': case 'm': case 'n': case 'o':
+ case 'p': case 'q': case 'r': case 's': case 't':
+ case 'u': case 'v': case 'w': case 'x': case 'y': case 'z':
+ case 'A': case 'B': case 'C': case 'D': case 'E':
+ case 'F': case 'G': case 'H': case 'I': case 'J':
+ case 'K': case 'L': case 'M': case 'N': case 'O':
+ case 'P': case 'Q': case 'R': case 'S': case 'T':
+ case 'U': case 'V': case 'W': case 'X': case 'Y': case 'Z':
+ case '-': case '.': case '_': case '~':
+ return TRUE;
+ default:
+ break;
+ }
+ return FALSE;
+}
+
+/* for ABI-compatibility with previous versions */
+char *curl_escape(const char *string, int inlength)
+{
+ return curl_easy_escape(NULL, string, inlength);
+}
+
+/* for ABI-compatibility with previous versions */
+char *curl_unescape(const char *string, int length)
+{
+ return curl_easy_unescape(NULL, string, length, NULL);
+}
+
+char *curl_easy_escape(CURL *handle, const char *string, int inlength)
+{
+ size_t alloc = (inlength?(size_t)inlength:strlen(string))+1;
+ char *ns;
+ char *testing_ptr = NULL;
+ unsigned char in; /* we need to treat the characters unsigned */
+ size_t newlen = alloc;
+ size_t strindex=0;
+ size_t length;
+ CURLcode result;
+
+ ns = malloc(alloc);
+ if(!ns)
+ return NULL;
+
+ length = alloc-1;
+ while(length--) {
+ in = *string;
+
+ if(Curl_isunreserved(in))
+ /* just copy this */
+ ns[strindex++]=in;
+ else {
+ /* encode it */
+ newlen += 2; /* the size grows with two, since this'll become a %XX */
+ if(newlen > alloc) {
+ alloc *= 2;
+ testing_ptr = realloc(ns, alloc);
+ if(!testing_ptr) {
+ free( ns );
+ return NULL;
+ }
+ else {
+ ns = testing_ptr;
+ }
+ }
+
+ result = Curl_convert_to_network(handle, &in, 1);
+ if(result) {
+ /* Curl_convert_to_network calls failf if unsuccessful */
+ free(ns);
+ return NULL;
+ }
+
+ snprintf(&ns[strindex], 4, "%%%02X", in);
+
+ strindex+=3;
+ }
+ string++;
+ }
+ ns[strindex]=0; /* terminate it */
+ return ns;
+}
+
+/*
+ * Curl_urldecode() URL decodes the given string.
+ *
+ * Optionally detects control characters (byte codes lower than 32) in the
+ * data and rejects such data.
+ *
+ * Returns a pointer to a malloced string in *ostring with length given in
+ * *olen. If length == 0, the length is assumed to be strlen(string).
+ *
+ */
+CURL_STATIC CURLcode Curl_urldecode(struct SessionHandle *data,
+ const char *string, size_t length,
+ char **ostring, size_t *olen,
+ bool reject_ctrl)
+{
+ size_t alloc = (length?length:strlen(string))+1;
+ char *ns = malloc(alloc);
+ unsigned char in;
+ size_t strindex=0;
+ unsigned long hex;
+ CURLcode result;
+
+ if(!ns)
+ return CURLE_OUT_OF_MEMORY;
+
+ while(--alloc > 0) {
+ in = *string;
+ if(('%' == in) && (alloc > 2) &&
+ ISXDIGIT(string[1]) && ISXDIGIT(string[2])) {
+ /* this is two hexadecimal digits following a '%' */
+ char hexstr[3];
+ char *ptr;
+ hexstr[0] = string[1];
+ hexstr[1] = string[2];
+ hexstr[2] = 0;
+
+ hex = strtoul(hexstr, &ptr, 16);
+
+ in = curlx_ultouc(hex); /* this long is never bigger than 255 anyway */
+
+ result = Curl_convert_from_network(data, &in, 1);
+ if(result) {
+ /* Curl_convert_from_network calls failf if unsuccessful */
+ free(ns);
+ return result;
+ }
+
+ string+=2;
+ alloc-=2;
+ }
+
+ if(reject_ctrl && (in < 0x20)) {
+ free(ns);
+ return CURLE_URL_MALFORMAT;
+ }
+
+ ns[strindex++] = in;
+ string++;
+ }
+ ns[strindex]=0; /* terminate it */
+
+ if(olen)
+ /* store output size */
+ *olen = strindex;
+
+ /* store output string */
+ *ostring = ns;
+
+ return CURLE_OK;
+}
+
+/*
+ * Unescapes the given URL escaped string of given length. Returns a
+ * pointer to a malloced string with length given in *olen.
+ * If length == 0, the length is assumed to be strlen(string).
+ * If olen == NULL, no output length is stored.
+ */
+char *curl_easy_unescape(CURL *handle, const char *string, int length,
+ int *olen)
+{
+ char *str = NULL;
+ size_t inputlen = length;
+ size_t outputlen;
+ CURLcode res = Curl_urldecode(handle, string, inputlen, &str, &outputlen,
+ FALSE);
+ if(res)
+ return NULL;
+ if(olen)
+ *olen = curlx_uztosi(outputlen);
+ return str;
+}
+
+/* For operating systems/environments that use different malloc/free
+ systems for the app and for this library, we provide a free that uses
+ the library's memory system */
+void curl_free(void *p)
+{
+ free(p);
+}
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