quickjs-tart

quickjs-based runtime for wallet-core logic
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bufref.c (3186B)

      1 /***************************************************************************
      2  *                                  _   _ ____  _
      3  *  Project                     ___| | | |  _ \| |
      4  *                             / __| | | | |_) | |
      5  *                            | (__| |_| |  _ <| |___
      6  *                             \___|\___/|_| \_\_____|
      7  *
      8  * Copyright (C) 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.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  * SPDX-License-Identifier: curl
     22  *
     23  ***************************************************************************/
     24 
     25 #include "curl_setup.h"
     26 #include "urldata.h"
     27 #include "bufref.h"
     28 #include "strdup.h"
     29 
     30 #include "curl_memory.h"
     31 #include "memdebug.h"
     32 
     33 #ifdef DEBUGBUILD
     34 #define SIGNATURE 0x5c48e9b2    /* Random pattern. */
     35 #endif
     36 
     37 /*
     38  * Init a bufref struct.
     39  */
     40 void Curl_bufref_init(struct bufref *br)
     41 {
     42   DEBUGASSERT(br);
     43   br->dtor = NULL;
     44   br->ptr = NULL;
     45   br->len = 0;
     46 
     47 #ifdef DEBUGBUILD
     48   br->signature = SIGNATURE;
     49 #endif
     50 }
     51 
     52 /*
     53  * Free the buffer and re-init the necessary fields. It does not touch the
     54  * 'signature' field and thus this buffer reference can be reused.
     55  */
     56 
     57 void Curl_bufref_free(struct bufref *br)
     58 {
     59   DEBUGASSERT(br);
     60   DEBUGASSERT(br->signature == SIGNATURE);
     61   DEBUGASSERT(br->ptr || !br->len);
     62 
     63   if(br->ptr && br->dtor)
     64     br->dtor(CURL_UNCONST(br->ptr));
     65 
     66   br->dtor = NULL;
     67   br->ptr = NULL;
     68   br->len = 0;
     69 }
     70 
     71 /*
     72  * Set the buffer reference to new values. The previously referenced buffer
     73  * is released before assignment.
     74  */
     75 void Curl_bufref_set(struct bufref *br, const void *ptr, size_t len,
     76                      void (*dtor)(void *))
     77 {
     78   DEBUGASSERT(ptr || !len);
     79   DEBUGASSERT(len <= CURL_MAX_INPUT_LENGTH);
     80 
     81   Curl_bufref_free(br);
     82   br->ptr = (const unsigned char *) ptr;
     83   br->len = len;
     84   br->dtor = dtor;
     85 }
     86 
     87 /*
     88  * Get a pointer to the referenced buffer.
     89  */
     90 const unsigned char *Curl_bufref_ptr(const struct bufref *br)
     91 {
     92   DEBUGASSERT(br);
     93   DEBUGASSERT(br->signature == SIGNATURE);
     94   DEBUGASSERT(br->ptr || !br->len);
     95 
     96   return br->ptr;
     97 }
     98 
     99 /*
    100  * Get the length of the referenced buffer data.
    101  */
    102 size_t Curl_bufref_len(const struct bufref *br)
    103 {
    104   DEBUGASSERT(br);
    105   DEBUGASSERT(br->signature == SIGNATURE);
    106   DEBUGASSERT(br->ptr || !br->len);
    107 
    108   return br->len;
    109 }
    110 
    111 CURLcode Curl_bufref_memdup(struct bufref *br, const void *ptr, size_t len)
    112 {
    113   unsigned char *cpy = NULL;
    114 
    115   DEBUGASSERT(br);
    116   DEBUGASSERT(br->signature == SIGNATURE);
    117   DEBUGASSERT(br->ptr || !br->len);
    118   DEBUGASSERT(ptr || !len);
    119   DEBUGASSERT(len <= CURL_MAX_INPUT_LENGTH);
    120 
    121   if(ptr) {
    122     cpy = Curl_memdup0(ptr, len);
    123     if(!cpy)
    124       return CURLE_OUT_OF_MEMORY;
    125   }
    126 
    127   Curl_bufref_set(br, cpy, len, curl_free);
    128   return CURLE_OK;
    129 }