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LibC+ping: Move internet_checksum to serenity header

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This will be useful for traceroute and any other packet related
application, so this will reduce code duplication.
This commit is contained in:
Idan Horowitz 2021-03-30 21:18:28 +03:00 • committed by Andreas Kling
parent ea34ba6fa6
commit aa6547492e
3 changed files with 19 additions and 15 deletions
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16
Userland/Libraries/LibC/serenity.cpp
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@ -24,6 +24,7 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <arpa/inet.h>
#include <errno.h>
#include <serenity.h>
#include <string.h>
@ -149,4 +150,19 @@ int getkeymap(char* name_buffer, size_t name_buffer_size, u32* map, u32* shift_m
int rc = syscall(SC_getkeymap, &params);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
u16 internet_checksum(const void* ptr, size_t count)
{
u32 checksum = 0;
auto* w = (const u16*)ptr;
while (count > 1) {
checksum += ntohs(*w++);
if (checksum & 0x80000000)
checksum = (checksum & 0xffff) | (checksum >> 16);
count -= 2;
}
while (checksum >> 16)
checksum = (checksum & 0xffff) + (checksum >> 16);
return htons(~checksum);
}
}