http-connection.c

00001 #include <stdlib.h>
00002 
00003 #include "http-connection.h"
00004 #include "mstimer.h"
00005 
00006 #define MAX_CONNECTIONS 10
00007 
00008 static struct HttpConnection connections[MAX_CONNECTIONS];
00009 
00010 static void zeroConnection(struct HttpConnection* p)
00011 {
00012     p->id           = 0;
00013     p->lastUsed     = 0;
00014     p->toDo         = 0;
00015     p->postComplete = false;
00016     p->delayUntil   = 0;
00017 }
00018 
00019 struct HttpConnection* HttpConnectionNew(int connectionId) //Never fails so never returns NULL
00020 {
00021     struct HttpConnection* p;
00022     
00023     //Look for an existing connection
00024     for (p = connections; p < connections + MAX_CONNECTIONS; p++)
00025     {
00026         if (p->id == connectionId) goto end;
00027     }
00028     
00029     //look for an empty connection
00030     {
00031         struct HttpConnection* pOldest = 0;
00032         uint32_t ageOldest = 0;
00033         for (p = connections; p < connections + MAX_CONNECTIONS; p++)
00034         {
00035             if (!p->id) goto end;
00036             
00037             //Otherwise record the oldest and keep going
00038             uint32_t age = MsTimerCount - p->lastUsed;
00039             if (age >= ageOldest)
00040             {
00041                 ageOldest = age;
00042                   pOldest = p;
00043             }
00044         }
00045     
00046         //No empty ones found so use the oldest
00047         p = pOldest;
00048     }
00049     
00050 end:
00051     zeroConnection(p);
00052     p->id           = connectionId;
00053     p->lastUsed     = MsTimerCount;
00054     return p;
00055 }
00056 struct HttpConnection* HttpConnectionOrNull(int connectionId)
00057 {
00058     for (struct HttpConnection* p = connections; p < connections + MAX_CONNECTIONS; p++)
00059     {
00060         if (p->id == connectionId)
00061         {
00062             p->lastUsed = MsTimerCount;
00063             return p;
00064         }
00065     }
00066     return NULL;
00067 }
00068 void HttpConnectionReset(int connectionId)
00069 {
00070     for (struct HttpConnection* p = connections; p < connections + MAX_CONNECTIONS; p++)
00071     {
00072         if (p->id == connectionId) zeroConnection(p);
00073     }
00074 }