77 lines
1.2 KiB
C
77 lines
1.2 KiB
C
/*
|
|
* buffer.c
|
|
*
|
|
* Created on: Oct 19, 2010
|
|
* Author: dogan
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <stdint.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);
|
|
data_buffer = NULL;
|
|
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;
|
|
}
|