Wiesner András
ac5fc9c529
-PcktSieve special return functionality added -ARP multicast learning bug fixed -include guards have been refactored -Doxygen style tweaked
70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
//
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// Created by epagris on 2023.01.16..
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//
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#include <memory.h>
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#include <stdbool.h>
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#include "tcp_window.h"
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#include "../../../dynmem.h"
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TcpWindow *tcpw_create(uint32_t size) {
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uint32_t allocSize = sizeof(TcpWindow) + size; // calculate full allocation size
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TcpWindow * tcpw = (TcpWindow *) dynmem_alloc(allocSize); // allocate data block at the end
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tcpw->mp = mp_init(tcpw->data, size); // initialize memory pool
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return tcpw;
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}
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#define TCP_WINDOW_MAX_WINSIZE_PADDING (16) // keep-out zone, this way allocated blocks will not block registry table growth TODO: not the best solution
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uint32_t tcpw_get_max_window_size(TcpWindow * tcpw) {
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return mp_largest_free_block_size(tcpw->mp) - sizeof(TcpWindowSegment) - TCP_WINDOW_MAX_WINSIZE_PADDING;
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}
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TcpWindowSegment * tcpw_store_segment(TcpWindow * tcpw, const uint8_t * data, uint32_t size, uint32_t seqNum) {
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TcpWindowSegment * seg = (TcpWindowSegment *) mp_alloc(tcpw->mp, sizeof(TcpWindowSegment) + size);
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if (seg == NULL) { // could not store...
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return NULL;
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}
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// store segment descriptor
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seg->size = size;
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seg->seqNum = seqNum;
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// store segment
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memcpy(seg->data, data, size);
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// chain-in into linked list of segments
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if (tcpw->firstSeg == NULL) {
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tcpw->firstSeg = tcpw->lastSeg = seg;
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} else {
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tcpw->lastSeg->next = seg;
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}
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//mp_report(tcpw->mp);
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return seg;
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}
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bool tcpw_acknowledge(TcpWindow * tcpw, uint32_t ackNum) {
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if (tcpw->firstSeg == NULL) { // cannot acknowledge if there's nothing to acknowledge
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return false;
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}
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uint32_t segAckNum = tcpw->firstSeg->seqNum + tcpw->firstSeg->size;
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if (segAckNum == ackNum) { // if the acknowledgement number is correct
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TcpWindowSegment * oldFirst = tcpw->firstSeg; // replace first
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TcpWindowSegment * newFirst = oldFirst->next;
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tcpw->firstSeg = newFirst;
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if (newFirst == NULL) { // if the list is empty, also clear pointer to last segment
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tcpw->lastSeg = NULL;
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}
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mp_free(tcpw->mp, (uint8_t *) oldFirst); // release old first segment
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//mp_report(tcpw->mp);
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return true;
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} else {
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return false;
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}
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}
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