Annotation of embedaddon/curl/lib/escape.c, revision 1.1
1.1 ! misho 1: /***************************************************************************
! 2: * _ _ ____ _
! 3: * Project ___| | | | _ \| |
! 4: * / __| | | | |_) | |
! 5: * | (__| |_| | _ <| |___
! 6: * \___|\___/|_| \_\_____|
! 7: *
! 8: * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
! 9: *
! 10: * This software is licensed as described in the file COPYING, which
! 11: * you should have received as part of this distribution. The terms
! 12: * are also available at https://curl.haxx.se/docs/copyright.html.
! 13: *
! 14: * You may opt to use, copy, modify, merge, publish, distribute and/or sell
! 15: * copies of the Software, and permit persons to whom the Software is
! 16: * furnished to do so, under the terms of the COPYING file.
! 17: *
! 18: * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
! 19: * KIND, either express or implied.
! 20: *
! 21: ***************************************************************************/
! 22:
! 23: /* Escape and unescape URL encoding in strings. The functions return a new
! 24: * allocated string or NULL if an error occurred. */
! 25:
! 26: #include "curl_setup.h"
! 27:
! 28: #include <curl/curl.h>
! 29:
! 30: #include "urldata.h"
! 31: #include "warnless.h"
! 32: #include "non-ascii.h"
! 33: #include "escape.h"
! 34: #include "strdup.h"
! 35: /* The last 3 #include files should be in this order */
! 36: #include "curl_printf.h"
! 37: #include "curl_memory.h"
! 38: #include "memdebug.h"
! 39:
! 40: /* Portable character check (remember EBCDIC). Do not use isalnum() because
! 41: its behavior is altered by the current locale.
! 42: See https://tools.ietf.org/html/rfc3986#section-2.3
! 43: */
! 44: bool Curl_isunreserved(unsigned char in)
! 45: {
! 46: switch(in) {
! 47: case '0': case '1': case '2': case '3': case '4':
! 48: case '5': case '6': case '7': case '8': case '9':
! 49: case 'a': case 'b': case 'c': case 'd': case 'e':
! 50: case 'f': case 'g': case 'h': case 'i': case 'j':
! 51: case 'k': case 'l': case 'm': case 'n': case 'o':
! 52: case 'p': case 'q': case 'r': case 's': case 't':
! 53: case 'u': case 'v': case 'w': case 'x': case 'y': case 'z':
! 54: case 'A': case 'B': case 'C': case 'D': case 'E':
! 55: case 'F': case 'G': case 'H': case 'I': case 'J':
! 56: case 'K': case 'L': case 'M': case 'N': case 'O':
! 57: case 'P': case 'Q': case 'R': case 'S': case 'T':
! 58: case 'U': case 'V': case 'W': case 'X': case 'Y': case 'Z':
! 59: case '-': case '.': case '_': case '~':
! 60: return TRUE;
! 61: default:
! 62: break;
! 63: }
! 64: return FALSE;
! 65: }
! 66:
! 67: /* for ABI-compatibility with previous versions */
! 68: char *curl_escape(const char *string, int inlength)
! 69: {
! 70: return curl_easy_escape(NULL, string, inlength);
! 71: }
! 72:
! 73: /* for ABI-compatibility with previous versions */
! 74: char *curl_unescape(const char *string, int length)
! 75: {
! 76: return curl_easy_unescape(NULL, string, length, NULL);
! 77: }
! 78:
! 79: char *curl_easy_escape(struct Curl_easy *data, const char *string,
! 80: int inlength)
! 81: {
! 82: size_t alloc;
! 83: char *ns;
! 84: char *testing_ptr = NULL;
! 85: size_t newlen;
! 86: size_t strindex = 0;
! 87: size_t length;
! 88: CURLcode result;
! 89:
! 90: if(inlength < 0)
! 91: return NULL;
! 92:
! 93: alloc = (inlength?(size_t)inlength:strlen(string)) + 1;
! 94: newlen = alloc;
! 95:
! 96: ns = malloc(alloc);
! 97: if(!ns)
! 98: return NULL;
! 99:
! 100: length = alloc-1;
! 101: while(length--) {
! 102: unsigned char in = *string; /* we need to treat the characters unsigned */
! 103:
! 104: if(Curl_isunreserved(in))
! 105: /* just copy this */
! 106: ns[strindex++] = in;
! 107: else {
! 108: /* encode it */
! 109: newlen += 2; /* the size grows with two, since this'll become a %XX */
! 110: if(newlen > alloc) {
! 111: alloc *= 2;
! 112: testing_ptr = Curl_saferealloc(ns, alloc);
! 113: if(!testing_ptr)
! 114: return NULL;
! 115: ns = testing_ptr;
! 116: }
! 117:
! 118: result = Curl_convert_to_network(data, (char *)&in, 1);
! 119: if(result) {
! 120: /* Curl_convert_to_network calls failf if unsuccessful */
! 121: free(ns);
! 122: return NULL;
! 123: }
! 124:
! 125: msnprintf(&ns[strindex], 4, "%%%02X", in);
! 126:
! 127: strindex += 3;
! 128: }
! 129: string++;
! 130: }
! 131: ns[strindex] = 0; /* terminate it */
! 132: return ns;
! 133: }
! 134:
! 135: /*
! 136: * Curl_urldecode() URL decodes the given string.
! 137: *
! 138: * Optionally detects control characters (byte codes lower than 32) in the
! 139: * data and rejects such data.
! 140: *
! 141: * Returns a pointer to a malloced string in *ostring with length given in
! 142: * *olen. If length == 0, the length is assumed to be strlen(string).
! 143: *
! 144: * 'data' can be set to NULL but then this function can't convert network
! 145: * data to host for non-ascii.
! 146: */
! 147: CURLcode Curl_urldecode(struct Curl_easy *data,
! 148: const char *string, size_t length,
! 149: char **ostring, size_t *olen,
! 150: bool reject_ctrl)
! 151: {
! 152: size_t alloc = (length?length:strlen(string)) + 1;
! 153: char *ns = malloc(alloc);
! 154: size_t strindex = 0;
! 155: unsigned long hex;
! 156: CURLcode result = CURLE_OK;
! 157:
! 158: if(!ns)
! 159: return CURLE_OUT_OF_MEMORY;
! 160:
! 161: while(--alloc > 0) {
! 162: unsigned char in = *string;
! 163: if(('%' == in) && (alloc > 2) &&
! 164: ISXDIGIT(string[1]) && ISXDIGIT(string[2])) {
! 165: /* this is two hexadecimal digits following a '%' */
! 166: char hexstr[3];
! 167: char *ptr;
! 168: hexstr[0] = string[1];
! 169: hexstr[1] = string[2];
! 170: hexstr[2] = 0;
! 171:
! 172: hex = strtoul(hexstr, &ptr, 16);
! 173:
! 174: in = curlx_ultouc(hex); /* this long is never bigger than 255 anyway */
! 175:
! 176: if(data) {
! 177: result = Curl_convert_from_network(data, (char *)&in, 1);
! 178: if(result) {
! 179: /* Curl_convert_from_network calls failf if unsuccessful */
! 180: free(ns);
! 181: return result;
! 182: }
! 183: }
! 184:
! 185: string += 2;
! 186: alloc -= 2;
! 187: }
! 188:
! 189: if(reject_ctrl && (in < 0x20)) {
! 190: free(ns);
! 191: return CURLE_URL_MALFORMAT;
! 192: }
! 193:
! 194: ns[strindex++] = in;
! 195: string++;
! 196: }
! 197: ns[strindex] = 0; /* terminate it */
! 198:
! 199: if(olen)
! 200: /* store output size */
! 201: *olen = strindex;
! 202:
! 203: /* store output string */
! 204: *ostring = ns;
! 205:
! 206: return CURLE_OK;
! 207: }
! 208:
! 209: /*
! 210: * Unescapes the given URL escaped string of given length. Returns a
! 211: * pointer to a malloced string with length given in *olen.
! 212: * If length == 0, the length is assumed to be strlen(string).
! 213: * If olen == NULL, no output length is stored.
! 214: */
! 215: char *curl_easy_unescape(struct Curl_easy *data, const char *string,
! 216: int length, int *olen)
! 217: {
! 218: char *str = NULL;
! 219: if(length >= 0) {
! 220: size_t inputlen = length;
! 221: size_t outputlen;
! 222: CURLcode res = Curl_urldecode(data, string, inputlen, &str, &outputlen,
! 223: FALSE);
! 224: if(res)
! 225: return NULL;
! 226:
! 227: if(olen) {
! 228: if(outputlen <= (size_t) INT_MAX)
! 229: *olen = curlx_uztosi(outputlen);
! 230: else
! 231: /* too large to return in an int, fail! */
! 232: Curl_safefree(str);
! 233: }
! 234: }
! 235: return str;
! 236: }
! 237:
! 238: /* For operating systems/environments that use different malloc/free
! 239: systems for the app and for this library, we provide a free that uses
! 240: the library's memory system */
! 241: void curl_free(void *p)
! 242: {
! 243: free(p);
! 244: }
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