90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
#include "packet.h"
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enum FD_STATE read_packet_from_tcp(int fd, struct buffer_packet* bp) {
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ssize_t nread;
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size_t pkt_size_size = sizeof(bp->ip.ap.str.size);
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if (bp->mode != BP_READING) return FDS_ERR;
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while (bp->aread < pkt_size_size) {
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nread = read(fd, &(bp->ip.ap.raw) + bp->aread, pkt_size_size - bp->aread);
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if (nread == 0) return FDS_AGAIN;
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if (nread == -1 && errno == EAGAIN) return FDS_AGAIN;
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if (nread == -1) return FDS_ERR;
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bp->aread += nread;
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}
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while (bp->aread < bp->ip.ap.str.size) {
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nread = read(fd, &(bp->ip.ap.raw) + bp->aread, bp->ip.ap.str.size - bp->aread);
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if (nread == 0) return FDS_AGAIN;
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if (nread == -1 && errno == EAGAIN) return FDS_AGAIN;
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if (nread == -1) return FDS_ERR;
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bp->aread += nread;
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}
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bp->mode = BP_WRITING;
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bp->awrite = 0;
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return FDS_READY;
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}
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enum FD_STATE write_packet_to_tcp(int fd, struct buffer_packet* bp) {
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ssize_t nwrite;
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if (bp->mode != BP_WRITING) return FDS_ERR;
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while (bp->awrite < bp->ip.ap.str.size) {
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nwrite = send(fd, &(bp->ip.ap.raw), bp->ip.ap.str.size, 0);
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if (nwrite == -1 && errno == EAGAIN) return FDS_AGAIN;
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if (nwrite == -1) return FDS_ERR;
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bp->awrite += nwrite;
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}
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bp->mode = BP_READING;
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bp->aread = 0;
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return FDS_READY;
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}
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enum FD_STATE write_packet_to_udp(int fd, struct buffer_packet* bp) {
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ssize_t nwrite;
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size_t bytes_to_send;
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size_t pkt_header_size = sizeof(bp->ip.ap.str) - sizeof(char);
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if (bp->mode != BP_WRITING) return FDS_ERR;
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bytes_to_send = bp->ip.ap.str.size - pkt_header_size;
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nwrite = send(fd,
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&(bp->ip.ap.str.payload),
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bytes_to_send,
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0);
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if (nwrite == -1 && errno == EAGAIN) return FDS_AGAIN;
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if (nwrite != bytes_to_send) return FDS_ERR;
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bp->mode = BP_READING;
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bp->aread = 0;
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return FDS_READY;
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}
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enum FD_STATE read_packet_from_udp (int fd, struct buffer_packet* bp) {
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ssize_t nread;
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if (bp->mode != BP_READING) return FDS_ERR;
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size_t pkt_header_size = sizeof(bp->ip.ap.str) - sizeof(char); // We remove the payload
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size_t udp_packet_size = sizeof(struct internet_packet) - pkt_header_size;
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nread = recv(fd, &(bp->ip.ap.str.payload), udp_packet_size, MSG_TRUNC);
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if ((int)nread > (int)udp_packet_size) return FDS_ERR;
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if (nread == -1 && errno == EAGAIN) return FDS_AGAIN;
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if (nread == -1) return FDS_ERR;
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bp->ip.ap.str.size = nread + pkt_header_size;
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bp->mode = BP_WRITING;
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bp->awrite = 0;
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return FDS_READY;
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}
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