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path: root/support/dktools/dk4membuf.c
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/*
Copyright (C) 2015-2020, Dirk Krause
SPDX-License-Identifier: BSD-3-Clause
*/

/*
	WARNING: This file was generated by the dkct program (see
	http://dktools.sourceforge.net/ for details).
	Changes you make here will be lost if dkct is run again!
	You should modify the original source and run dkct on it.
	Original source: dk4membuf.ctr
*/

/**	@file dk4membuf.c The dk4membuf module.
*/


#line 113 "dk4membuf.ctr"

#include "dk4conf.h"
#include "dk4membuf.h"
#include "dk4mem.h"
#include "dk4maasz.h"

#if DK4_HAVE_ASSERT_H
#ifndef	ASSERT_H_INCLUDED
#include <assert.h>
#define	ASSERT_H_INCLUDED 1
#endif
#endif




#line 128 "dk4membuf.ctr"



static
void
dk4membuf_cell_close(dk4_membuf_cell_t *mcptr)
{
#if	DK4_USE_ASSERT
	assert(NULL != mcptr);
#endif
  if (NULL != mcptr) {
    dk4mem_release(mcptr->buf);
    mcptr->next = NULL;
    mcptr->max = mcptr->used = 0;
    dk4mem_free(mcptr);
  }
}



static
dk4_membuf_cell_t *
dk4membuf_cell_open(size_t sz, dk4_er_t *erp)
{
  dk4_er_t		 er;
  dk4_membuf_cell_t	*back	= NULL;
  size_t		 nb;

  /*	Ensure number of bytes is a multiple of the chunk size.
  */
  nb = sz / DK4MEMBUF_CHUNK_SIZE;
  if (0 != (sz % DK4MEMBUF_CHUNK_SIZE)) { nb++; }
  dk4error_init(&er);
  nb = dk4ma_size_t_mul(nb, (size_t)(DK4MEMBUF_CHUNK_SIZE), &er);
  if (0 != er.ec) { nb = sz; }

  /*	Allocate
  */
  back = dk4mem_new(dk4_membuf_cell_t,1,erp);
  if (NULL != back) {
    back->next = NULL;
    back->max  = nb;
    back->used = 0;
    back->buf = dk4mem_new(char,nb,erp);
    if (NULL == back->buf) {
      dk4mem_free(back);
      back = NULL;
    }
  }
  return back;
}



dk4_membuf_t *
dk4membuf_open(dk4_er_t *erp)
{
  dk4_membuf_t		*back	= NULL;
  back = dk4mem_new(dk4_membuf_t,1,erp);
  if (NULL != back) {
    back->he = 0;
    back->last = NULL;
    back->first = dk4membuf_cell_open(DK4MEMBUF_CHUNK_SIZE, erp);
    if (NULL != back->first) {
      back->last = back->first;
    } else {
      dk4mem_free(back);
      back = NULL;
    }
  }
  return back;
}



void
dk4membuf_close(dk4_membuf_t *mbptr)
{
  dk4_membuf_cell_t	*pc;
  dk4_membuf_cell_t	*pn;
#if	DK4_USE_ASSERT
	assert(NULL != mbptr);
#endif
  if (NULL != mbptr) {
    pc = mbptr->first;
    while (NULL != pc) {
      pn = pc->next;
      dk4membuf_cell_close(pc);
      pc = pn;
    }
    dk4mem_free(mbptr);
  }
}



int
dk4membuf_store(dk4_membuf_t *mbptr, const void *src, size_t sz, dk4_er_t *erp)
{
  dk4_membuf_cell_t	*pc	= NULL;
  dk4_membuf_cell_t	*pn	= NULL;
  const char		*psrc	= NULL;
  size_t		 bl	= 0;
  int			 back	= 0;
#if	DK4_USE_ASSERT
	assert(NULL != src);
	assert(0 < sz);
	assert(NULL != mbptr);
#endif
  if ((NULL != mbptr) && (NULL != src) && (0 < sz)) {
    /*	Initialize variables.
    */
    back = 1;
    pc   = mbptr->last;
    psrc = (const char *)src;
    /*	Attempt to fill current cell.
    */
    if (pc->max > pc->used) {
      bl = pc->max - pc->used;
      if (sz < bl) { bl = sz; }
      DK4_MEMCPY(&((pc->buf)[pc->used]), psrc, bl);
      pc->used += bl;
      sz -= bl;
      psrc = &(psrc[bl]);
    }
    /*	Use new cell if necessary.
    */
    if (0 < sz) {
      back = 0;
      pn = dk4membuf_cell_open(sz, erp);
      if (NULL != pn) {
        pc->next = pn;
	mbptr->last = pn;
	DK4_MEMCPY(pn->buf, psrc, sz);
	back = 1;
	pn->used = sz;
      } else {
        mbptr->he = 1;
      }
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}



int
dk4membuf_size(size_t *szptr, dk4_membuf_t const *mbptr, dk4_er_t *erp)
{
  dk4_er_t		 er;
  dk4_membuf_cell_t	*cp	= NULL;
  size_t		 result	= (size_t)0U;
  int			 back	= 0;
  

#line 284 "dk4membuf.ctr"
#if	DK4_USE_ASSERT
	assert(NULL != szptr);
	assert(NULL != mbptr);
#endif
  if ((NULL != szptr) && (NULL != mbptr)) {
    back = 1;
    cp = mbptr->first;
    dk4error_init(&er);
    

#line 293 "dk4membuf.ctr"
    while (NULL != cp) {
      

#line 295 "dk4membuf.ctr"
      result = dk4ma_size_t_add(result, cp->used, &er);
      cp = cp->next;
    }
    if (DK4_E_NONE == er.ec) {
      back = 1;
      *szptr = result;
    }
#if TRACE_DEBUG
    else {			

#line 304 "dk4membuf.ctr"
    }
#endif
  } else {
#if TRACE_DEBUG
    if (NULL == szptr) {	

#line 309 "dk4membuf.ctr"
    }
    if (NULL == mbptr) {	

#line 311 "dk4membuf.ctr"
    }
#endif
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  

#line 316 "dk4membuf.ctr"
  return back;
}