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https://github.com/moparisthebest/curl
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34cf40321c
A struct bufref holds a buffer pointer, a data size and a destructor. When freed or its contents are changed, the previous buffer is implicitly released by the associated destructor. The data size, although not used internally, allows binary data support. A unit test checks its handling methods: test 1661 Closes #6654
128 lines
3.1 KiB
C
128 lines
3.1 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) 2021, 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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***************************************************************************/
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#include "curl_setup.h"
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#include "urldata.h"
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#include "bufref.h"
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#include "curl_memory.h"
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#include "memdebug.h"
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#define SIGNATURE 0x5c48e9b2 /* Random pattern. */
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/*
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* Init a bufref struct.
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*/
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void Curl_bufref_init(struct bufref *br)
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{
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DEBUGASSERT(br);
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br->dtor = NULL;
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br->ptr = NULL;
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br->len = 0;
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#ifdef DEBUGBUILD
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br->signature = SIGNATURE;
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#endif
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}
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/*
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* Free the buffer and re-init the necessary fields. It doesn't touch the
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* 'signature' field and thus this buffer reference can be reused.
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*/
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void Curl_bufref_free(struct bufref *br)
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{
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DEBUGASSERT(br);
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DEBUGASSERT(br->signature == SIGNATURE);
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DEBUGASSERT(br->ptr || !br->len);
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if(br->ptr && br->dtor)
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br->dtor((void *) br->ptr);
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br->dtor = NULL;
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br->ptr = NULL;
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br->len = 0;
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}
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/*
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* Set the buffer reference to new values. The previously referenced buffer
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* is released before assignment.
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*/
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void Curl_bufref_set(struct bufref *br, const void *ptr, size_t len,
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void (*dtor)(void *))
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{
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DEBUGASSERT(ptr || !len);
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DEBUGASSERT(len <= CURL_MAX_INPUT_LENGTH);
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Curl_bufref_free(br);
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br->ptr = (const unsigned char *) ptr;
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br->len = len;
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br->dtor = dtor;
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}
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/*
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* Get a pointer to the referenced buffer.
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*/
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const unsigned char *Curl_bufref_ptr(const struct bufref *br)
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{
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DEBUGASSERT(br);
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DEBUGASSERT(br->signature == SIGNATURE);
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DEBUGASSERT(br->ptr || !br->len);
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return br->ptr;
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}
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/*
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* Get the length of the referenced buffer data.
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*/
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size_t Curl_bufref_len(const struct bufref *br)
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{
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DEBUGASSERT(br);
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DEBUGASSERT(br->signature == SIGNATURE);
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DEBUGASSERT(br->ptr || !br->len);
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return br->len;
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}
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CURLcode Curl_bufref_memdup(struct bufref *br, const void *ptr, size_t len)
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{
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unsigned char *cpy = NULL;
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DEBUGASSERT(br);
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DEBUGASSERT(br->signature == SIGNATURE);
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DEBUGASSERT(br->ptr || !br->len);
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DEBUGASSERT(ptr || !len);
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DEBUGASSERT(len <= CURL_MAX_INPUT_LENGTH);
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if(ptr) {
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cpy = malloc(len + 1);
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if(!cpy)
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return CURLE_OUT_OF_MEMORY;
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if(len)
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memcpy(cpy, ptr, len);
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cpy[len] = '\0';
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}
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Curl_bufref_set(br, cpy, len, curl_free);
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return CURLE_OK;
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}
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