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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2020, 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 https://curl.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.
*
***************************************************************************/
#include "curl_setup.h"
#include "dynbuf.h"
#include "curl_printf.h"
#ifdef BUILDING_LIBCURL
#include "curl_memory.h"
#endif
#include "memdebug.h"
#define MIN_FIRST_ALLOC 32
#define DYNINIT 0xbee51da /* random pattern */
/*
* Init a dynbuf struct.
*/
void Curl_dyn_init(struct dynbuf *s, size_t toobig)
{
DEBUGASSERT(s);
DEBUGASSERT(toobig);
s->bufr = NULL;
s->leng = 0;
s->allc = 0;
s->toobig = toobig;
#ifdef DEBUGBUILD
s->init = DYNINIT;
#endif
}
/*
* free the buffer and re-init the necessary fields. It doesn't touch the
* 'init' field and thus this buffer can be reused to add data to again.
*/
void Curl_dyn_free(struct dynbuf *s)
{
DEBUGASSERT(s);
Curl_safefree(s->bufr);
s->leng = s->allc = 0;
}
/*
* Store/append an chunk of memory to the dynbuf.
*/
static CURLcode dyn_nappend(struct dynbuf *s,
const unsigned char *mem, size_t len)
{
size_t indx = s->leng;
size_t a = s->allc;
size_t fit = len + indx + 1; /* new string + old string + zero byte */
/* try to detect if there's rubbish in the struct */
DEBUGASSERT(s->init == DYNINIT);
DEBUGASSERT(s->toobig);
DEBUGASSERT(indx < s->toobig);
DEBUGASSERT(!s->leng || s->bufr);
if(fit > s->toobig) {
Curl_dyn_free(s);
return CURLE_OUT_OF_MEMORY;
}
else if(!a) {
DEBUGASSERT(!indx);
/* first invoke */
if(fit < MIN_FIRST_ALLOC)
a = MIN_FIRST_ALLOC;
else
a = fit;
}
else {
while(a < fit)
a *= 2;
}
if(a != s->allc) {
/* this logic is not using Curl_saferealloc() to make the tool not have to
include that as well when it uses this code */
void *p = realloc(s->bufr, a);
if(!p) {
Curl_safefree(s->bufr);
s->leng = s->allc = 0;
return CURLE_OUT_OF_MEMORY;
}
s->bufr = p;
s->allc = a;
}
if(len)
memcpy(&s->bufr[indx], mem, len);
s->leng = indx + len;
s->bufr[s->leng] = 0;
return CURLE_OK;
}
/*
* Clears the string, keeps the allocation. This can also be called on a
* buffer that already was freed.
*/
void Curl_dyn_reset(struct dynbuf *s)
{
DEBUGASSERT(s);
DEBUGASSERT(s->init == DYNINIT);
DEBUGASSERT(!s->leng || s->bufr);
if(s->leng)
s->bufr[0] = 0;
s->leng = 0;
}
#ifdef USE_NGTCP2
/*
* Specify the size of the tail to keep (number of bytes from the end of the
* buffer). The rest will be dropped.
*/
CURLcode Curl_dyn_tail(struct dynbuf *s, size_t trail)
{
DEBUGASSERT(s);
DEBUGASSERT(s->init == DYNINIT);
DEBUGASSERT(!s->leng || s->bufr);
if(trail > s->leng)
return CURLE_BAD_FUNCTION_ARGUMENT;
else if(trail == s->leng)
return CURLE_OK;
else if(!trail) {
Curl_dyn_reset(s);
}
else {
memmove(&s->bufr[0], &s->bufr[s->leng - trail], trail);
s->leng = trail;
s->bufr[s->leng] = 0;
}
return CURLE_OK;
}
#endif
/*
* Appends a buffer with length.
*/
CURLcode Curl_dyn_addn(struct dynbuf *s, const void *mem, size_t len)
{
DEBUGASSERT(s);
DEBUGASSERT(s->init == DYNINIT);
DEBUGASSERT(!s->leng || s->bufr);
return dyn_nappend(s, mem, len);
}
/*
* Append a null-terminated string at the end.
*/
CURLcode Curl_dyn_add(struct dynbuf *s, const char *str)
{
size_t n = strlen(str);
DEBUGASSERT(s);
DEBUGASSERT(s->init == DYNINIT);
DEBUGASSERT(!s->leng || s->bufr);
return dyn_nappend(s, (unsigned char *)str, n);
}
/*
* Append a string vprintf()-style
*/
CURLcode Curl_dyn_vaddf(struct dynbuf *s, const char *fmt, va_list ap)
{
#ifdef BUILDING_LIBCURL
int rc;
DEBUGASSERT(s);
DEBUGASSERT(s->init == DYNINIT);
DEBUGASSERT(!s->leng || s->bufr);
rc = Curl_dyn_vprintf(s, fmt, ap);
if(!rc)
return CURLE_OK;
#else
char *str;
str = vaprintf(fmt, ap); /* this allocs a new string to append */
if(str) {
CURLcode result = dyn_nappend(s, (unsigned char *)str, strlen(str));
free(str);
return result;
}
/* If we failed, we cleanup the whole buffer and return error */
Curl_dyn_free(s);
#endif
return CURLE_OUT_OF_MEMORY;
}
/*
* Append a string printf()-style
*/
CURLcode Curl_dyn_addf(struct dynbuf *s, const char *fmt, ...)
{
CURLcode result;
va_list ap;
DEBUGASSERT(s);
DEBUGASSERT(s->init == DYNINIT);
DEBUGASSERT(!s->leng || s->bufr);
va_start(ap, fmt);
result = Curl_dyn_vaddf(s, fmt, ap);
va_end(ap);
return result;
}
/*
* Returns a pointer to the buffer.
*/
char *Curl_dyn_ptr(const struct dynbuf *s)
{
DEBUGASSERT(s);
DEBUGASSERT(s->init == DYNINIT);
DEBUGASSERT(!s->leng || s->bufr);
return s->bufr;
}
/*
* Returns an unsigned pointer to the buffer.
*/
unsigned char *Curl_dyn_uptr(const struct dynbuf *s)
{
DEBUGASSERT(s);
DEBUGASSERT(s->init == DYNINIT);
DEBUGASSERT(!s->leng || s->bufr);
return (unsigned char *)s->bufr;
}
/*
* Returns the length of the buffer.
*/
size_t Curl_dyn_len(const struct dynbuf *s)
{
DEBUGASSERT(s);
DEBUGASSERT(s->init == DYNINIT);
DEBUGASSERT(!s->leng || s->bufr);
return s->leng;
}
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