osd-contiki/apps/rest-common/buffer.c

76 lines
1.1 KiB
C

/*
* buffer.c
*
* Created on: Oct 19, 2010
* Author: dogan
*/
#include <stdlib.h>
#include <string.h>
#include "buffer.h"
uint8_t* data_buffer;
uint16_t buffer_size;
uint16_t buffer_index;
void
delete_buffer(void)
{
if (data_buffer) {
free(data_buffer);
buffer_index = 0;
buffer_size = 0;
}
}
uint8_t*
init_buffer(uint16_t size)
{
delete_buffer();
data_buffer = (uint8_t*)malloc(size);
if (data_buffer) {
buffer_size = size;
}
buffer_index = 0;
return data_buffer;
}
uint8_t*
allocate_buffer(uint16_t size)
{
uint8_t* buffer = NULL;
/*To get rid of alignment problems, always allocate even size*/
if (size % 2) {
size++;
}
if (buffer_index + size < buffer_size) {
buffer = data_buffer + buffer_index;
buffer_index += size;
}
return buffer;
}
uint8_t*
copy_to_buffer(void* data, uint16_t len)
{
uint8_t* buffer = allocate_buffer(len);
if (buffer) {
memcpy(buffer, data, len);
}
return buffer;
}
uint8_t*
copy_text_to_buffer(char* text)
{
uint8_t* buffer = allocate_buffer(strlen(text) + 1);
if (buffer) {
strcpy(buffer, text);
}
return buffer;
}