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#include "buf.h"
buf_t* buf_init()
{
buf_t *ret = NULL;
ret = malloc( sizeof(buf_t) );
memset(ret, 0, sizeof(buf_t));
return ret;
}
int buf_size( buf_t *bf, int size )
{
if (bf->buf != NULL)
{
printf("Buffer should be empty\n");
return -1;
}
bf->buf = malloc( size );
bf->size = size;
bf->buf_size = size;
return 0;
}
int buf_used_size( buf_t *bf, int size )
{
if ( size > bf->buf_size )
{
printf("Cannot set buffer size more then buffer itself\n");
return -1;
}
if ( size < 0)
{
printf("Cannot set buffer less then zero\n");
return -1;
}
bf->size = size;
return 0;
}
int buf_resize( buf_t *bf, int size )
{
uint8_t *n=NULL;
if ( size < 1)
{
printf("Cannot set buffer size less then 1\n");
return -1;
}
n = realloc( bf->buf, size ); //resized data is not nullified at the end?
if ( n == NULL )
{
printf("Buffer realloc failed\n");
return -1;
}
if ( size > bf->buf_size )
{
memset(bf->buf+bf->buf_size-1, 0, size-(bf->buf_size)); //hope its correct
}
bf->buf_size = size;
bf->buf = n;
if (bf->size > bf->buf_size)
{
bf->size = bf->buf_size;
}
return 0;
}
int buf_zero( buf_t *bf )
{
if ( bf->buf == NULL )
return -1;
memset( bf->buf, 0, bf->buf_size );
return 0;
}
void buf_free( buf_t *bf )
{
if ( bf == NULL )
return;
if ( bf->buf != NULL )
{
free( bf->buf );
bf->buf = NULL;
}
free( bf );
bf = NULL;
}
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