deavmi/libtun
deavmi
/
libtun
mirror of https://github.com/deavmi/libtun.git
1
0
Fork 0
Code Issues Releases Activity

Allocate scratchpad once and then dup copy a range 

Improved efficiency and memory usage (till next GC)
This commit is contained in:
Tristan B. Velloza Kildaire 2021-07-21 22:08:50 +02:00
parent 00fd2bba7e
commit 13efc3bba7
1 changed files with 11 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
source/libtun/adapter.d
View File

@ -20,6 +20,10 @@ public class TUNAdapter
private int tunFD;
private bool isClosed;
/* Temporary scratchpad buffer */
private byte[] scratch;
this(string interfaceName, AdapterType adapterType = AdapterType.TAP)
{
init(interfaceName);
@ -32,6 +36,10 @@ public class TUNAdapter
{
throw new TUNException("Error creating tun device");
}
/* TODO: Get device MTU and add functions for setting it */
ushort mtu = cast(ushort)-1;
scratch.length = mtu;
}
private void sanityCheck()
@ -55,12 +63,7 @@ public class TUNAdapter
{
sanityCheck();
/* TODO: Get device MTU and add functions for setting it */
ushort mtu = cast(ushort)-1;
/* Temporary scratchpad buffer */
byte[] scratch;
scratch.length = mtu;
/**
* We read with a request of maximum possible
@ -71,7 +74,7 @@ public class TUNAdapter
* Former, systemcall read error
* Latter, ethernet frame size
*/
int status = tunRead(tunFD, cast(char*)scratch.ptr, mtu);
int status = tunRead(tunFD, cast(char*)scratch.ptr, cast(int)scratch.length);
if(status < 0)
@ -85,7 +88,7 @@ public class TUNAdapter
else
{
/* Copy the data into their buffer (and of correct length) */
buffer = scratch[0..status];
buffer = scratch[0..status].dup;
}