libSystem
/* $Id$ */
/* Copyright (c) 2006-2020 Pierre Pronchery <khorben@defora.org> */
/* This file is part of DeforaOS System libSystem */
/* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/* TODO
* - use a single allocation for each buffer */
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "System/error.h"
#include "System/object.h"
#include "System/buffer.h"
/* Buffer */
/* private */
/* types */
struct _Buffer
{
size_t size;
BufferData * data;
};
/* public */
/* functions */
/* buffer_new */
Buffer * buffer_new(size_t size, BufferData const * data)
{
Buffer * buffer;
if((buffer = (Buffer *)object_new(sizeof(*buffer))) == NULL)
return NULL;
if((buffer->data = (BufferData *)object_new(size)) == NULL && size != 0)
{
object_delete(buffer);
return NULL;
}
if(data == NULL)
memset(buffer->data, 0, size);
else
memcpy(buffer->data, data, size);
buffer->size = size;
return buffer;
}
/* buffer_new_copy */
Buffer * buffer_new_copy(Buffer const * buffer)
{
return buffer_new(buffer->size, buffer->data);
}
/* buffer_delete */
void buffer_delete(Buffer * buffer)
{
object_delete(buffer->data);
object_delete(buffer);
}
/* accessors */
/* buffer_get_data */
BufferData const * buffer_get_data(Buffer const * buffer)
{
return buffer->data;
}
/* buffer_get_size */
size_t buffer_get_size(Buffer const * buffer)
{
return buffer->size;
}
/* buffer_set */
int buffer_set(Buffer * buffer, size_t size, BufferData const * data)
{
if(buffer_set_size(buffer, size) != 0)
return -1;
if(data == NULL)
memset(buffer->data, 0, size);
else
memcpy(buffer->data, data, size);
return 0;
}
/* buffer_set_data */
int buffer_set_data(Buffer * buffer, size_t offset, BufferData const * data,
size_t size)
{
size_t s = offset + size;
if(s < offset && s < size)
return error_set_code(-ERANGE, "%s", strerror(ERANGE));
if(offset + size > buffer->size)
if(buffer_set_size(buffer, offset + size) != 0)
return -1;
memcpy(&buffer->data[offset], data, size);
return 0;
}
/* buffer_set_size */
int buffer_set_size(Buffer * buffer, size_t size)
{
BufferData * p;
if(size == buffer->size)
return 0;
if((p = (BufferData *)realloc(buffer->data, size)) == NULL && size != 0)
return error_set_code(-errno, "%s", strerror(errno));
buffer->data = p;
if(size > buffer->size)
memset(&buffer->data[buffer->size], 0, size - buffer->size);
buffer->size = size;
return 0;
}