1 files changed, 145 insertions, 0 deletions
diff --git a/src/qcommon/net.h b/src/qcommon/net.h
new file mode 100644
index 0000000..7766d23
--- /dev/null
+++ b/src/qcommon/net.h
@@ -0,0 +1,145 @@
+#ifndef QCOMMON_NET_H
+#define QCOMMON_NET_H 1
+
+#include <stdint.h>
+
+/*
+==============================================================
+
+NET
+
+==============================================================
+*/
+
+#define NET_ENABLEV4 0x01
+#define NET_ENABLEV6 0x02
+// if this flag is set, always attempt ipv6 connections instead of ipv4 if a v6 address is found.
+#define NET_PRIOV6 0x04
+// disables ipv6 multicast support if set.
+#define NET_DISABLEMCAST 0x08
+
+#define NET_ENABLEALT1PROTO 0x01
+#define NET_ENABLEALT2PROTO 0x02
+#define NET_DISABLEPRIMPROTO 0x04
+
+#define PACKET_BACKUP 32  // number of old messages that must be kept on client and
+                          // server for delta compression and ping estimation
+#define PACKET_MASK (PACKET_BACKUP - 1)
+
+#define MAX_PACKET_USERCMDS 32  // max number of usercmd_t in a packet
+
+#define MAX_SNAPSHOT_ENTITIES 256
+
+#define PORT_ANY -1
+
+#define MAX_RELIABLE_COMMANDS 128  // max string commands buffered for retransmit
+
+enum netadrtype_t {
+    NA_BAD = 0,  // an address lookup failed
+    NA_LOOPBACK,
+    NA_BROADCAST,
+    NA_IP,
+    NA_IP6,
+    NA_MULTICAST6,
+    NA_UNSPEC
+};
+
+typedef enum { NS_CLIENT, NS_SERVER } netsrc_t;
+
+#define NET_ADDRSTRMAXLEN 48  // maximum length of an IPv6 address string including trailing '\0'
+struct netadr_t {
+    enum netadrtype_t type;
+
+    uint8_t ip[4];
+    uint8_t ip6[16];
+
+    unsigned short port;
+    unsigned long scope_id;  // Needed for IPv6 link-local addresses
+
+    int alternateProtocol;
+};
+
+void NET_Init(void);
+void NET_Shutdown(void);
+void NET_Restart_f(void);
+void NET_Config(bool enableNetworking);
+void NET_FlushPacketQueue(void);
+void NET_SendPacket(netsrc_t sock, int length, const void *data, struct netadr_t to);
+void NET_OutOfBandPrint(netsrc_t net_socket, struct netadr_t adr, const char *format, ...)
+    __attribute__((format(printf, 3, 4)));
+void NET_OutOfBandData(netsrc_t sock, struct netadr_t adr, uint8_t *format, int len);
+
+bool NET_CompareAdr(struct netadr_t a, struct netadr_t b);
+bool NET_CompareBaseAdrMask(struct netadr_t a, struct netadr_t b, int netmask);
+bool NET_CompareBaseAdr(struct netadr_t a, struct netadr_t b);
+bool NET_IsLocalAddress(struct netadr_t adr);
+const char *NET_AdrToString(struct netadr_t a);
+const char *NET_AdrToStringwPort(struct netadr_t a);
+int NET_StringToAdr(const char *s, struct netadr_t *a, enum netadrtype_t family);
+bool NET_GetLoopPacket(netsrc_t sock, struct netadr_t *net_from, struct msg_t *net_message);
+void NET_JoinMulticast6(void);
+void NET_LeaveMulticast6(void);
+void NET_Sleep(int msec);
+
+#define MAX_MSGLEN 16384  // max length of a message, which may be fragmented into multiple packets
+
+#define MAX_DOWNLOAD_WINDOW 48  // ACK window of 48 download chunks. Cannot set this higher, or clients
+			 	// will overflow the reliable commands buffer
+#define MAX_DOWNLOAD_BLKSIZE 1024  // 896 uint8_t block chunks
+
+#define NETCHAN_GENCHECKSUM(challenge, sequence) ((challenge) ^ ((sequence) * (challenge)))
+
+/*
+Netchan handles packet fragmentation and out of order / duplicate suppression
+*/
+
+typedef struct {
+    netsrc_t sock;
+
+    int dropped;  // between last packet and previous
+
+    int alternateProtocol;
+    struct netadr_t remoteAddress;
+    int qport;  // qport value to write when transmitting
+
+    // sequencing variables
+    int incomingSequence;
+    int outgoingSequence;
+
+    // incoming fragment assembly buffer
+    int fragmentSequence;
+    int fragmentLength;
+    uint8_t fragmentBuffer[MAX_MSGLEN];
+
+    // outgoing fragment buffer
+    // we need to space out the sending of large fragmented messages
+    bool unsentFragments;
+    int unsentFragmentStart;
+    int unsentLength;
+    uint8_t unsentBuffer[MAX_MSGLEN];
+
+    int challenge;
+    int lastSentTime;
+    int lastSentSize;
+} netchan_t;
+
+void Netchan_Init(int qport);
+void Netchan_Setup(
+    int alternateProtocol, netsrc_t sock, netchan_t *chan, struct netadr_t adr, int qport, int challenge);
+
+void Netchan_Transmit(netchan_t *chan, int length, const uint8_t *data);
+void Netchan_TransmitNextFragment(netchan_t *chan);
+
+bool Netchan_Process(netchan_t *chan, struct msg_t *msg);
+
+void Sys_SendPacket(int length, const void *data, struct netadr_t to);
+bool Sys_StringToAdr(const char *s, struct netadr_t *a, enum netadrtype_t family); // Does NOT parse port numbers, only base addresses.
+bool Sys_IsLANAddress(struct netadr_t adr);
+void Sys_ShowIP(void); 
+
+#define SV_ENCODE_START 4
+#define SV_DECODE_START 12
+#define CL_ENCODE_START 12
+#define CL_DECODE_START 4
+
+#endif