1 files changed, 107 insertions, 0 deletions
diff --git a/buf.c b/buf.c
new file mode 100644
index 0000000..440ac76
--- /dev/null
+++ b/buf.c
@@ -0,0 +1,107 @@
+#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;
+}