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/*
* (C) 2014 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*/
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include "msg_buff.h"
struct msg_buff {
uint16_t len;
unsigned char *head;
unsigned char *data;
unsigned char *tail;
unsigned char *end;
unsigned char _data[0];
};
struct msg_buff *msgb_alloc(uint32_t size)
{
struct msg_buff *msgb;
msgb = malloc(sizeof(struct msg_buff) + size);
if (msgb == NULL)
return NULL;
msgb->len = 0;
msgb->head = msgb->_data;
msgb->data = msgb->tail = msgb->_data;
msgb->end = msgb->_data + size;
return msgb;
}
void msgb_free(struct msg_buff *msgb)
{
free(msgb);
}
uint32_t msgb_size(struct msg_buff *msgb)
{
return msgb->end - msgb->head;
}
uint32_t msgb_len(struct msg_buff *msgb)
{
return msgb->len;
}
void *msgb_put(struct msg_buff *msgb, uint32_t len)
{
void *data = msgb->tail;
msgb->len += len;
msgb->tail += len;
return data;
}
void *msgb_pull(struct msg_buff *msgb, uint32_t len)
{
void *ptr = msgb->data;
if (len > msgb->len)
return NULL;
msgb->len -= len;
msgb->data += len;
return ptr;
}
unsigned char *msgb_data(struct msg_buff *msgb)
{
return msgb->data;
}
unsigned char *msgb_tail(struct msg_buff *msgb)
{
return msgb->tail;
}
void msgb_burp(struct msg_buff *msgb)
{
void *data = msgb->data;
int len = msgb->len;
msgb->data = msgb->head;
memcpy(msgb->data, data, len);
}
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