235 lines
6.4 KiB
C
235 lines
6.4 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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/* Escape and unescape URL encoding in strings. The functions return a new
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* allocated string or NULL if an error occurred. */
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#include "curl_setup.h"
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#include <curl/curl.h>
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#include "urldata.h"
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#include "warnless.h"
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#include "escape.h"
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#include "strdup.h"
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/* The last 3 #include files should be in this order */
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#include "curl_printf.h"
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#include "curl_memory.h"
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#include "memdebug.h"
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/* for ABI-compatibility with previous versions */
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char *curl_escape(const char *string, int inlength)
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{
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return curl_easy_escape(NULL, string, inlength);
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}
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/* for ABI-compatibility with previous versions */
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char *curl_unescape(const char *string, int length)
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{
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return curl_easy_unescape(NULL, string, length, NULL);
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}
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/* Escapes for URL the given unescaped string of given length.
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* 'data' is ignored since 7.82.0.
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*/
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char *curl_easy_escape(struct Curl_easy *data, const char *string,
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int inlength)
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{
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size_t length;
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struct dynbuf d;
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(void)data;
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if(inlength < 0)
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return NULL;
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Curl_dyn_init(&d, CURL_MAX_INPUT_LENGTH * 3);
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length = (inlength?(size_t)inlength:strlen(string));
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if(!length)
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return strdup("");
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while(length--) {
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unsigned char in = *string++; /* treat the characters unsigned */
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if(ISUNRESERVED(in)) {
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/* append this */
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if(Curl_dyn_addn(&d, &in, 1))
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return NULL;
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}
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else {
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/* encode it */
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const char hex[] = "0123456789ABCDEF";
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char out[3]={'%'};
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out[1] = hex[in>>4];
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out[2] = hex[in & 0xf];
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if(Curl_dyn_addn(&d, out, 3))
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return NULL;
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}
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}
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return Curl_dyn_ptr(&d);
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}
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static const unsigned char hextable[] = {
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 0, 0, 0, 0, 0, /* 0x30 - 0x3f */
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0, 10, 11, 12, 13, 14, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x40 - 0x4f */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x50 - 0x5f */
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0, 10, 11, 12, 13, 14, 15 /* 0x60 - 0x66 */
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};
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/* the input is a single hex digit */
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#define onehex2dec(x) hextable[x - '0']
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/*
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* Curl_urldecode() URL decodes the given string.
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*
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* Returns a pointer to a malloced string in *ostring with length given in
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* *olen. If length == 0, the length is assumed to be strlen(string).
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*
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* ctrl options:
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* - REJECT_NADA: accept everything
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* - REJECT_CTRL: rejects control characters (byte codes lower than 32) in
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* the data
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* - REJECT_ZERO: rejects decoded zero bytes
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*
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* The values for the enum starts at 2, to make the assert detect legacy
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* invokes that used TRUE/FALSE (0 and 1).
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*/
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CURLcode Curl_urldecode(const char *string, size_t length,
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char **ostring, size_t *olen,
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enum urlreject ctrl)
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{
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size_t alloc;
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char *ns;
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DEBUGASSERT(string);
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DEBUGASSERT(ctrl >= REJECT_NADA); /* crash on TRUE/FALSE */
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alloc = (length?length:strlen(string));
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ns = malloc(alloc + 1);
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if(!ns)
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return CURLE_OUT_OF_MEMORY;
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/* store output string */
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*ostring = ns;
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while(alloc) {
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unsigned char in = *string;
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if(('%' == in) && (alloc > 2) &&
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ISXDIGIT(string[1]) && ISXDIGIT(string[2])) {
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/* this is two hexadecimal digits following a '%' */
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in = (unsigned char)(onehex2dec(string[1]) << 4) | onehex2dec(string[2]);
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string += 3;
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alloc -= 3;
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}
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else {
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string++;
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alloc--;
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}
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if(((ctrl == REJECT_CTRL) && (in < 0x20)) ||
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((ctrl == REJECT_ZERO) && (in == 0))) {
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Curl_safefree(*ostring);
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return CURLE_URL_MALFORMAT;
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}
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*ns++ = in;
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}
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*ns = 0; /* terminate it */
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if(olen)
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/* store output size */
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*olen = ns - *ostring;
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return CURLE_OK;
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}
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/*
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* Unescapes the given URL escaped string of given length. Returns a
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* pointer to a malloced string with length given in *olen.
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* If length == 0, the length is assumed to be strlen(string).
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* If olen == NULL, no output length is stored.
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* 'data' is ignored since 7.82.0.
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*/
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char *curl_easy_unescape(struct Curl_easy *data, const char *string,
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int length, int *olen)
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{
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char *str = NULL;
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(void)data;
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if(length >= 0) {
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size_t inputlen = (size_t)length;
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size_t outputlen;
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CURLcode res = Curl_urldecode(string, inputlen, &str, &outputlen,
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REJECT_NADA);
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if(res)
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return NULL;
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if(olen) {
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if(outputlen <= (size_t) INT_MAX)
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*olen = curlx_uztosi(outputlen);
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else
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/* too large to return in an int, fail! */
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Curl_safefree(str);
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}
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}
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return str;
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}
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/* For operating systems/environments that use different malloc/free
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systems for the app and for this library, we provide a free that uses
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the library's memory system */
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void curl_free(void *p)
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{
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free(p);
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}
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/*
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* Curl_hexencode()
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*
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* Converts binary input to lowercase hex-encoded ASCII output.
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* Null-terminated.
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*/
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void Curl_hexencode(const unsigned char *src, size_t len, /* input length */
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unsigned char *out, size_t olen) /* output buffer size */
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{
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const char *hex = "0123456789abcdef";
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DEBUGASSERT(src && len && (olen >= 3));
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if(src && len && (olen >= 3)) {
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while(len-- && (olen >= 3)) {
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/* clang-tidy warns on this line without this comment: */
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/* NOLINTNEXTLINE(clang-analyzer-core.UndefinedBinaryOperatorResult) */
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*out++ = hex[(*src & 0xF0)>>4];
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*out++ = hex[*src & 0x0F];
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++src;
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olen -= 2;
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}
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*out = 0;
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}
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else if(olen)
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*out = 0;
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}
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