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118 lines
2.7 KiB
118 lines
2.7 KiB
4 years ago
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/*
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* $Id: pi-buffer.c,v 1.10 2006/10/12 14:21:22 desrod Exp $
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*
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* pi-buffer.c: simple data block management for variable data storage
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*
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* Copyright (c) 2004-2005, Florent Pillet.
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Library General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library
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* General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "pi-buffer.h"
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pi_buffer_t*
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pi_buffer_new (size_t capacity)
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{
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pi_buffer_t* buf;
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buf = (struct pi_buffer_t *) malloc (sizeof (struct pi_buffer_t));
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if (buf == NULL)
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return NULL;
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if (capacity <= 0)
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capacity = 16; /* allocating 0 byte is illegal - use a small value instead */
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buf->data = (unsigned char *) malloc (capacity);
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if (buf->data == NULL) {
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free (buf);
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return NULL;
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}
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buf->allocated = capacity;
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buf->used = 0;
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return buf;
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}
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pi_buffer_t*
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pi_buffer_expect (pi_buffer_t *buf, size_t expect)
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{
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if ((buf->allocated - buf->used) >= expect)
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return buf;
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if (buf->data)
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buf->data = (unsigned char *) realloc (buf->data, buf->used + expect);
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else
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buf->data = (unsigned char *) malloc (expect);
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if (buf->data == NULL) {
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buf->allocated = 0;
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buf->used = 0;
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return NULL;
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}
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buf->allocated = buf->used + expect;
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return buf;
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}
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pi_buffer_t*
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pi_buffer_append (pi_buffer_t *buf, const void *data, size_t len)
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{
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if (pi_buffer_expect (buf, len) == NULL)
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return NULL;
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memcpy (buf->data + buf->used, data, len);
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buf->used += len;
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return buf;
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}
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pi_buffer_t *
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pi_buffer_append_buffer (pi_buffer_t *dest, const pi_buffer_t *src)
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{
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return pi_buffer_append (dest, src->data, src->used);
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}
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void
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pi_buffer_clear (pi_buffer_t *buf)
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{
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buf->used = 0;
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if (buf->allocated > (size_t)65535)
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{
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buf->data = (unsigned char *) realloc (buf->data, 65535);
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buf->allocated = (buf->data == NULL) ? 0 : 65535;
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}
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}
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void
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pi_buffer_free (pi_buffer_t* buf)
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{
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if (buf) {
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if (buf->data)
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free (buf->data);
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free (buf);
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}
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}
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/* vi: set ts=8 sw=4 sts=4 noexpandtab: cin */
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/* ex: set tabstop=4 expandtab: */
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/* Local Variables: */
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/* indent-tabs-mode: t */
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/* c-basic-offset: 8 */
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/* End: */
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